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Variabilidade de produção de aflatoxinas por linhagens de Aspergillus flavus em diferentes tempos de manutenção
Provedor de dados: 63
Autores: Taniwaki,M.H.; Fonseca,H.; Pizzirani-Kleiner,A.A.
O presente trabalho fui realizado com a finalidade de se estudar a produção de aflatoxinas por linhagens de A. flavus, recém isoladas, em diferentes tempos de manutenção, a fim de contribuir para um melhor entendimento do mecanismo de variação na produção de aflatoxinas. Para isso, foram utilizadas três linhagens de A. flavus produtoras de aflatoxinas, classificadas como: a) grande produtora; b) média produtora e c) baixa produtora. Neste experimento, que se estendeu por 280 dias, os fungos foram estudados em dois métodos de preservação: mantido em óleo mineral, no meio Czapeck, e repicado periodicamente em meio Czapeck modificado. A análise da produção de aflatoxinas foi efetuada de 30 em 30 dias. A quantificação da toxina foi feita por cromatografía em...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aflatoxinas; Aspergillus flavus; Tempo de manutenção.
Ano: 1993
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161993000100019

Production of ethanol from mesquite [Prosopis juliflora (SW) D.C.] pods mash by Zymomonas mobilis in submerged fermentation
Provedor de dados: 63
Autores: Silva,Celiane Gomes Maia da; Andrade,Samara Alvachian Cardoso; Schuler,Alexandre Ricardo Pereira; Souza,Evandro Leite de; Stamford,Tânia Lúcia Montenegro.
Mesquite [Prosopis juliflora (SW) D.C.], a perennial tropical plant commonly found in Brazilian semi-arid region, is a viable raw material for fermentative processes because of its low cost and production of pods with high content of hydrolysable sugars which generate many compounds, including ethanol. This study aimed to evaluate the use of mesquite pods as substrate for ethanol production by Z. mobilis UFPEDA205 in a submerged fermentation. The fermentation was assessed for rate of substrate yield to ethanol, rate of ethanol production and efficiency of fermentation. The very close theoretical (170 g L-1) and experimental (165 g L-1) maximum ethanol yields were achieved at 36 h of fermentation. The highest counts of Z. mobilis UFEPEDA-205 (both close to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Renewable sources; Bioconversion; Fermentative parameters.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000100019

ANTAGONISMO IN VITRO DE Trichoderma spp.  A Verticillium dahliae KLEB
Provedor de dados: 63
Autores: MARTINS-CORDER,M.P.; MELO,I.S. de.
O presente trabalho visou testar e selecionar isolados selvagens de Trichoderma spp. quanto à capacidade antagônica ao fungo fitopatogênico Verticillium dahliae. Os ensaios in vitro consistiram de testes para avaliar a capacidade hiperparasítica e de antibiose através da produção de metabólitos voláteis e não voláteis. Pela técnica de culturas pareadas, 47 isolados de diversas espécies de Trichoderma foram avaliados e, pelos resultados obtidos, 20 foram selecionados. Através do teste de antibiose, selecionaram-se 7 isolados: T15P e Tal-1 (T. viride), TW6 e CNP311A (T. koningii), CNP17 e TCII (T. harzianum) e Tal-10 (T. aureoviride) os quais inibiram completamente o crescimento micelial de V. dahliae através da produção de metabólitos. Observações...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biocontrole; Parasitismo; Antagonismo; Trichoderma; Verticillium.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000100002

Cupriavidus necator strains: zinc and cadmium tolerance and bioaccumulation
Provedor de dados: 63
Autores: Ferreira,Paulo Ademar Avelar; Bomfeti,Cleide Aparecida; Soares,Cláudio Roberto Fonsêca de Souza; Soares,Bruno Lima; Moreira,Fatima Maria de Souza.
ABSTRACT: Among soil microorganisms, the genus Cupriavidus has garnered particular scientific, economic and ecological interest because of its ability to fix nitrogen and tolerate high concentrations of metals. The aim of this study was to analyze four strains of Cupriavidus necator for their ability to tolerate and bioaccumulate cadmium and zinc. The tolerance of these strains to these metals was assessed in liquid culture medium containing different concentrations of Zn + Cd and in soil solutions and soils contaminated with multiple elements including Zn, Cd, Cu and Pb. The four strains showed high tolerance to Zn and Cd, both in culture medium and when inoculated into contaminated soil solutions or multi-element contaminated soil. The UFLA02-71 strain...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Β-proteobacteria; Bioremediation; Heavy-metal; Soil pollution.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162018000600452

Genetic diversity of cultivated Coffea arabica inbred lines assessed by RAPD, AFLP and SSR marker systems
Provedor de dados: 63
Autores: Maluf,Mirian Perez; Silvestrini,Milene; Ruggiero,Luciana Machado de Campos; Guerreiro Filho,Oliveiro; Colombo,Carlos Augusto.
One of the greatest problems in Coffea arabica breeding is identifying precisely any inbred line, based only on botanical and agronomical descriptors, because of the reduced genetic variability of the species, close pedigree origin, which results in small phenotypic variation. Recently, molecular markers have been used for plant germplasm characterization and identification in several commercial species. This work evaluates the reliability of three marker systems: RAPD, AFLP and SSR, to characterize the genetic variability of commercially-used Coffea inbred lines developed by the Instituto Agronômico (IAC), and their potential for cultivar identification. All methods identified polymorphisms among the cultivars. The genetic diversity recognized by the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coffee; Cultivar identification; Molecular markers.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000400010

Production of paulista gherkin using trellis net support
Provedor de dados: 63
Autores: Modolo,Valéria A.; Costa,Cyro Paulino da.
Paulista gherkin is a new gherkin type obtained by crossing Cucumis anguria var. anguria x C. anguria var. longaculeatus. It differs from common gherkin in its fruits and leaves. Elite lines of Paulista gherkin present similar performance for total yield and fruit weight but some have distinctive characteristics, including fruit and leaf attributes. The combination of these characteristics through production of Paulista gherkin hybrids could be an alternative for fruit quality and/or yield improvement. The purpose of the present work was to compare the yield of Paulista gherkin lines and their hybrids grown on a trellis net under field conditions. Four lines and their six single-cross hybrids were evaluated for yield and fruit production using the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cucumis anguria var. anguria; Vegetable crop; Management; Yield.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000100008

Computational system for geostatistical analysis
Provedor de dados: 63
Autores: Vendrusculo,Laurimar Gonçalves; Magalhães,Paulo Sérgio Graziano; Vieira,Sidney Rosa; Carvalho,José Ruy Porto de.
Geostatistics identifies the spatial structure of variables representing several phenomena and its use is becoming more intense in agricultural activities. This paper describes a computer program, based on Windows Interfaces (Borland Delphi), which performs spatial analyses of datasets through geostatistic tools: Classical statistical calculations, average, cross- and directional semivariograms, simple kriging estimates and jackknifing calculations. A published dataset of soil Carbon and Nitrogen was used to validate the system. The system was useful for the geostatistical analysis process, for the manipulation of the computational routines in a MS-DOS environment. The Windows development approach allowed the user to model the semivariogram graphically...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Spatial variability; Semivariogram; Software.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000100017

Energy balance methodology and modeling of supplementary forage production for cattle in Brazil
Provedor de dados: 63
Autores: Romanelli,Thiago Libório; Milan,Marcos.
Cattle is the main protein source in Brazil and cattle production depends on preserving forage in order to decrease the influence of dry periods on grass production. To minimize such problems, some new techniques have been created to increase the yield which also leads to energy demand increase. Energy balance is a vital tool to evaluate the efficiency of energy consumption in production systems. There is no standard methodology established for this determination. It is also difficult to analyze different management options because of the complexity of the production systems and the interactions among variables. Therefore the purpose of this study is to develop a methodology that supports the development of a model, using a spreadsheet, and to use it to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Environmental management; Production systems; Sustainability; Silage; Haylage.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000100001

Insect damage and powdery mildew severity in soybean cultivars and lines
Provedor de dados: 63
Autores: Lourenção,André Luiz; Braga,Nelson Raimundo; Miranda,Manoel Albino Coelho de; Reco,Paulo César; Valle,Giuliana Etore do; Pereira,José Carlos Vila Nova Alves.
The use of soybean cultivars resistant to insects and diseases reduces the application of pesticides, decreasing production costs and promoting a sustainable agriculture. The damage of stink bugs and defoliators and the severity of powdery mildew (Microsphaera diffusa) in soybean of three maturity groups were evaluated under field conditions, at Tarumã and Ribeirão Preto, State of São Paulo, Brazil. Three experiments, one for each group, were carried out in the 1999/2000 and 2000/2001 growing seasons. In 1999/2000, the disease occurred in Tarumã; in that year, infestation of chrysomelids (Cerotoma sp. and Colaspis sp.) was observed in Ribeirão Preto. Low infestations of stink bugs occurred in both years and locations, but in Tarumã, at the stage of plant...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycine max; Microsphaera diffusa; Host plant resistance; Stink bugs; Defoliators.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000600004

Quantitative genetics theory for genomic selection and efficiency of genotypic value prediction in open-pollinated populations
Provedor de dados: 63
Autores: Viana,José Marcelo Soriano; Piepho,Hans-Peter; Silva,Fabyano Fonseca e.
ABSTRACT: Quantitative genetics theory for genomic selection has mainly focused on additive effects. This study presents quantitative genetics theory applied to genomic selection aiming to prove that prediction of genotypic value based on thousands of single nucleotide polymorphisms (SNPs) depends on linkage disequilibrium (LD) between markers and QTLs, assuming dominance and epistasis. Based on simulated data, we provided information on dominance and genotypic value prediction accuracy, assuming mass selection in an open-pollinated population, all quantitative trait loci (QTLs) of lower effect, and reduced sample size. We show that the predictor of dominance value is proportional to the square of the LD value and to the dominance deviation for each QTL...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Genome-wide selection; Dominance value prediction; Prediction accuracy.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162017000100041

Predatory ability of Arthrobotrys musiformis and Monacrosporium thaumasium on Scutellonema bradys
Provedor de dados: 63
Autores: Soares,Ana Cristina Fermino; Sousa,Carla da Silva; Coimbra,João Luiz; Machado,Gisele da Silva; Garrido,Marlon da Silva; Almeida,Nailson dos Santos.
Scutellonema bradys (Steiner &amp;amp; LeHew) Andrassy is the most important yam nematode in the State of Bahia, Brazil, being responsible for the decay of yam tubers, known as dry rot disease. Nematode-trapping fungi are potential biocontrol agents against plant parasitic nematodes. The in vitro predatory ability of Arthrobotrys musiformis Drechsler and Monacrosporium thaumasium Drechsler on S. bradys was evaluated. The fungi were grown in PDA medium, than transferred to the center of Petri dishes with 2% agar plus water. After 14 days of the fungal cultures incubation, 150 nematodes were added to the dishes. For a period of 5 days, at 24-hour intervals, the number of captured nematodes was counted. Both fungi formed trapping structures of single ring and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dioscorea cayennensis Lam.; Nematophagous fungi; Yam dry rot; Biological control.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000400011

Níveis de alumínio e o desenvolvimento de porta-enxertos cítricos em cultivo hidropônico: I. Parâmetros biométricos
Provedor de dados: 63
Autores: Santos,Carlos Henrique dos; Grassi Filho,Hélio; Rodrigues,João Domingos; Pinho,Sheila Zambello de.
O presente trabalho teve como objetivo avaliar a influência de diferentes níveis de alumínio nos parâmetros biométricos dos porta-enxertos cítricos limoeiro Cravo e citrumeleiro Swingle em cultivo hidropônico. O experimento foi instalado em casa de vegetação em Botucatu, SP. Os tratamentos seguiram o delineamento estatístico inteiramente casualizado, com 3 repetições, em parcelas subdivididas. Os níveis de alumínio utilizados foram: 0; 7,5; 15; 22,5 e 30 mg L-1, na forma de AlCl3 6.H2O em solução nutritiva. Foram avaliados os parâmetros biométricos altura, número de folhas, diâmetro do caule, área foliar, comprimento e volume de raízes. De acordo com os resultados obtidos, conclui-se que o citrumeleiro Swingle apresentou-se mais sensível ao alumínio, sendo...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Citrus; Porta-enxerto; Alumínio; Nutrição mineral; Hidroponia.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000400020

An overview of sugarcane brown rust in Cuba
Provedor de dados: 63
Autores: La O,María; Perera,María Francisca; Bertani,Romina Priscila; Acevedo,Ricardo; Arias,Marta Eugenia; Casas,Mario Alberto; Pérez,Juana; Puchades,Yaquelín; Rodríguez,Eida; Alfonso,Isabel; Castagnaro,Atilio Pedro.
ABSTRACT: Multiple pathogens affect sugarcane, among them Puccinia melanocephala, the causal agent of brown rust. This disease was first reported in Cuba in 1979 when it was responsible for a severe attack on the main sugarcane variety B4362. The aims of the present study were to give an overview of sugarcane brown rust in Cuba and show the current disease situation in the country. A retrospective analysis regard to sugarcane cultivar composition resistant to brown rust in Cuba was carried out. In addition 154 genotypes, including the most used progenitors in the breeding program and commercial varieties were evaluated under natural infection conditions. The identity of P. melanocephala was verified by Polymerase Chain Reaction (PCR) and by sequencing the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Puccinia melanocephala; Varietal mosaic; Resistance.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162018000300233

NOVOS GENÓTlPOS DE TRIGO (Triticum aestivum L.) OBTIDOS POR IRRADIAÇÃO GAMA
Provedor de dados: 63
Autores: CAMARGO,C.E. de O.; TULMANN NETO,A.; FERREIRA FILHO,A.W.P.; FELÍCI0,J.C.; DE CASTRO,J.L.; PETTINELLI JUNIOR,A.
Compararam-se dezesseis linhagens mutantes tolerantes à toxicidade de alumínio em solução nutritiva, uma linhagem mutante sensível e os cultivares Anahuac, IAC-60 e IAC-24, de trigo. As linhagens mutantes foram originárias de seleções realizadas em populações do cultivar Anahuac (sensível ao Al3+) cujas sementes foram submetidas ao tratamento de irradiação gama com as doses de 260 e 310 Gy. As comparações foram realizadas em dois locais através de seis experimentos em épocas diferentes, analisando-se a produção de grãos, características agronômicas e tolerância a solos ácidos. Quinze linhagens mutantes foram mais produtivas que o cultivar Anahuac e a linhagem mutante sensível ao Al3+, em Capão Bonito, em solo ácido e em condição de sequeiro. Nestas...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Trigo; Melhoramento; Alumínio; Mutante; Irradiação gama; Genótipos.
Ano: 1997
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161997000200014

CAPACIDADE DE DISPERSÃO DE Trichogramma pretiosum Riley, 1879 PARA O CONTROLE DE Anticarsia gemmatalis Hübner, 1818 EM SOJA
Provedor de dados: 63
Autores: ZACHRISSON,B.; PARRA,J.R.P.
Avaliou-se a capacidade de dispersão de Trichogramma pretiosum, Riley 1879, em relação a ovos de Anticarsia gemmatalis, Hübner 1818, na cultura da soja, em Piracicaba, São Paulo. Após 24 horas da liberação dos parasitóides, determinou-se a distância média e a área de dispersão para T. pretiosum, atingindo 8 m e 77 m2, respectivamente. Desta forma, a liberação do parasitóide deve ser feita em 130 pontos/ha, para que toda a àrea seja atingida pelo parasitóide.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Trichogramma pretiosum; Soja; Anticarsia gemmatalis; Controle biológico; Glycine max; Lagarta-da-soja.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000100021

Amostragem seqüencial com base na lei de Taylor para levantamento de Spodoptera frugiperda na cultura do milho
Provedor de dados: 63
Autores: Farias,Paulo Roberto Silva; Barbosa,José Carlos; Busoli,Antônio Carlos.
A lagarta do cartucho do milho é uma das principais pragas do milho nas Américas, podendo ocorrer durante todos os estágios de crescimento da cultura, causando perdas de 15 a 37% na produção. Neste trabalho estudou-se a distribuição espacial dessa praga no campo, com a finalidade de desenvolver um sistema de amostragem para estimar sua densidade populacional. Na área cultivada com milho foram selecionados 3 campos experimentais de 40 m x 250 m cada, divididos em 100 parcelas cada. Foram contados o número de lagartas pequenas e grandes de S. frugiperda nas folhas e no cartucho das plantas, em 10 plantas ao acaso por parcela, num total de 1000 plantas por campo, em 5, 5 e 4 datas de amostragem, respectivamente. Lagartas menores que 1 cm eram consideradas...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Zea mays; Lei de Taylor; Distribuição espacial; Lagarta do cartucho.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000200025

Amadurecimento de mangas 'Tommy Atkins' tratadas com Ca em pré-colheita
Provedor de dados: 63
Autores: Kluge,Ricardo Alfredo; Scarpare Filho,João Alexio; Sampaio,Vladimir Rodrigues.
Sete aplicações de cloreto de cálcio (0,6 ou 1,2%) foram realizadas em pré-colheita de mangas `Tommy Atkins' para verificar seus efeitos sobre o teor de cálcio na polpa dos frutos e a evolução do amadurecimento. As avaliações foram realizadas na colheita e durante doze dias de armazenamento a 25oC e 60-70% UR. Os tratamentos não elevaram o teor de cálcio na polpa e não influenciaram a perda de peso, o teor de sólidos solúveis totais, a acidez total titulável e a firmeza de polpa dos frutos.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mangifera indica; Cloreto de cálcio; Firmeza de polpa; Pós-colheita.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000300033

Disponibilidade hídrica e germinação de sementes de cebola (Allium cepa L.)
Provedor de dados: 63
Autores: Piana,Z.; Cavariani,C.; Tillmann,M.A.A.; Minami,K.
Objetivando verificar a influência do teor de água do substrato na germinação de sementes de cebola (Allium cepa L.), conduziu-se um ensaio sob condições de ambiente de laboratório. Os efeitos de cinco níveis de água no substrato solo x areia (3:1), 20, 40, 60, 80 e 100% da capacidade de retenção foram avaliados através da porcentagem de emergência no 14° dia da semeadura e pesos da matéria verde e seca das plântulas normais. Para tanto, 200 sementes do cultivar Pira Ouro por tratamento, em quatro repetições de 50, foram semeadas a 1,5 cm de profundidade, mantendo-se constantes os níveis de água no substrato. Os resultados possibilitaram concluir que os níveis de umidade do solo indicados para germinação de sementes de cebola são de 40% e 60% da capacidade...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sementes; Água; Germinação; Cebola.
Ano: 1994
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000300018

Efeitos da suplementação independente de sódio e cloro na dieta de suínos na fase inicial
Provedor de dados: 63
Autores: Menten,J.F.M.; Fu,P.K.; Miller,E.R.
Este estudo foi realizado para avaliar os efeitos de diferentes níveis dietéticos de sódio (Na) e cloro (Cl) sobre o desempenho e concentração de eletrólitos no sangue de suínos na fase inicial. Os tratamentos consistiram de rações à base de milho e farelo de soja com 2 níveis de Na (0,12 e 0,18%) e 3 níveis de Cl (0,04; 0,12 e 0,20%) num arranjo fatorial. Foram utilizadas 12 baias, contendo 6 animais cada, num delineamento em blocos casualizados com duas repetições por tratamento. O peso médio inicial foi 7,5 kg e o experimento teve duração de quatro semanas. O bicarbonato de sódio e o cloreto de amonio foram as fontes de Na e Cl, respectivamente. As concentrações plasmáticas de cálcio, fósforo, sódio e cloro foram determinadas ao final do experimento....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sódio; Cloro; Suínos.
Ano: 1993
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161993000100001

Efeito do número de liberações de Trichogramma galloi (Zucchi, 1988) no parasitismo de ovos de Diatraea saccharalis (Fabr., 1794)
Provedor de dados: 63
Autores: Botelho,P.S.M.; Parra,J.R.P.; Magrini,E.A.; Haddad,M.L.; Resende,L.C.L.
O trabalho teve por objetivo estudar o efeito do número de liberações semanais de Trichogramma galloi Zucchi, 1988, em áreas de cana-de-açúcar sucessivamente infestadas com ovos de Diatraea saccharalis (Fabr., 1794). Foram conduzidos experimentos com a variedade RB 72454, com seis e nove meses de idade, em duas regiões distintas, espaçamento de l,40m, sendo por região, demarcadas quatro áreas de um hectare, delimitando-se no centro delas, uma parcela com 400 m². Cada parcela foi, por três semanas consecutivas, infestada com 25 casais de D. saccharalis, liberando-se T. galloi da seguinte forma (tratamentos): 1. sem liberação (testemunha); 2. uma liberação logo após a primeira infestação artificial; 3. duas liberações, uma logo após a primeira infestação...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Controle biológico; Broca-da-cana-de-açúcar; Diatraea saccharalis; Trichogramma galloi.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000100012

Neural network and state-space models for studying relationships among soil properties
Provedor de dados: 63
Autores: Timm,Luís Carlos; Gomes,Daniel Takata; Barbosa,Emanuel Pimentel; Reichardt,Klaus; Souza,Manoel Dornelas de; Dynia,José Flávio.
The study of soil property relationships is of great importance in agronomy aiming for a rational management of environmental resources and an improvement of agricultural productivity. Studies of this kind are traditionally performed using static regression models, which do not take into account the involved spatial structure. This work has the objective of evaluating the relation between a time-consuming and "expensive" variable (like soil total nitrogen) and other simple, easier to measure variables (as for instance, soil organic carbon, pH, etc.). Two important classes of models (linear state-space and neural networks) are used for prediction and compared with standard uni- and multivariate regression models, used as reference. For an oat crop...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil attributes; Prediction models; Spatial transect; Latent variables.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000400010

Bayesian sequential procedure to estimate the viability of seeds Coffea arabica L. in tetrazolium test
Provedor de dados: 63
Autores: Brighenti,Carla Regina Guimarães; Cirillo,Marcelo Ângelo; Costa,André Luís Alves; Rosa,Sttela Dellyzete Veiga Franco da; Guimarães,Renato Mendes.
ABSTRACT: Tetrazolium tests use conventional sampling techniques in which a sample has a fixed size. These tests may be improved by sequential sampling, which does not work with fixed-size samples. When data obtained from an experiment are analyzed sequentially the analysis can be terminated when a particular decision has been made, and thus, there is no need to pre-establish the number of seeds to assess. Bayesian statistics can also help, if we have sufficient knowledge about coffee production in the area to construct a prior distribution. Therefore, we used the Bayesian sequential approach to estimate the percentage of viable coffee seeds submitted to tetrazolium testing, and we incorporated priors with information from other analyses of crops from...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Beta distribution; Seed analysis; Sampling; Coffee; Prior distribution.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162019001300198

Phosphorus utilization in broilers fed with diets supplemented with different feed ingredients
Provedor de dados: 63
Autores: Dias,Raquel Souza; López,Secundino; Borgatti,Laura Maria Oliveira; Kebreab,Ermias; Vitti,Dorinha Miriam Silber Schmidt; Abdalla,Adibe Luiz; Appuhamy,Jayasooriya Arachchige Don Ranga Niroshan; France,James.
ABSTRACT: A reliable determination of endogenous phosphorus (P) excretion is required to measure P utilization in chickens accurately. The objective of this study was to investigate phosphorus (P) retention in broilers fed diets formulated with different feed ingredients. Sixty-four 15-d old broiler chicks were fed diets in which part of the dietary P was provided from dicalcium phosphate, maize, barley or soybean. Level of supplementation of each ingredient was calculated to provide two levels of total P (4.5 or 5.0 g kg−1 feed). Birds received a single injection of 3 MBq of 32P to determine endogenous P excretion using the isotope dilution technique. Four days after injection, blood and excreta were collected for analysis of inorganic and radioactive P....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chicken; Endogenous; Isotope dilution; Phosphorus retention.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162019000100018

Nutrient cycling in a RRIM 600 clone rubber plantation
Provedor de dados: 63
Autores: Murbach,Marcos Roberto; Boaretto,Antonio Enedi; Muraoka,Takashi; Souza,Euclides Caxambu Alexandrino de.
Few reports have been presented on nutrient cycling in rubber tree plantations (Hevea brasiliensis Muell. Arg.). This experiment was carried out to evaluate: the effect of K rates on the amount of nutrients transfered to the soil in a 13-year old Hevea brasilensis RRIM 600 clone plantation, nutrient retranslocation from the leaves before falling to the soil, and nutrient loss by dry rubber export. The experiment started in 1998 and potassium was applied at the rates of 0, 40, 80 and 160 kg ha-1 of K2O under the crowns of 40 rubber trees of each plot. Literfall collectors, five per plot, were randomly distributed within the plots under the trees. The accumulated literfall was collected monthly during one year. The coagulated rubber latex from each plot was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Litterfall; Fertilization; Nutrition; Rubber; Nutrient exportation.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000200021

Cupric citrate as growth promoter for broiler chickens in different rearing stages
Provedor de dados: 63
Autores: Brainer,Mônica Maria de Almeida; Menten,José Fernando Machado; Vale,Marcos Martinez do; Morais,Sônia Cristina Daroz de.
Feeding cupric citrate as alternative to cupric sulfate to broilers has been suggested in the literature. Day-old male broiler chicks (1,200) were used in an experiment to evaluate the efficacy of cupric citrate supplementation (75 mg Cu kg-1) during the 1-21, 22-42 or 1-42 d periods in comparison to an unsupplemented diet and a diet supplemented with cupric sulfate (200 mg Cu kg-1, 1-42 d). A randomized block design was used, with five treatments, six replicates and 40 birds per pen. The diets, based on corn and soybean meal, and water were offered ad libitum during the 42-day experimental period. Over the entire period, there was no effect of copper supplementation (P &gt; 0.05) on bird live weight, weight gain, feed intake, feed conversion and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Broiler litter; Poultry; Copper; Performance.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000300004

Comparison of carbon sequestration potential in agricultural and afforestation farming systems
Provedor de dados: 63
Autores: Lin,Chinsu; Lin,Chun-Hsiung.
In the last few decades, many forests have been cut down to make room for cultivation and to increase food or energy crops production in developing countries. In this study, carbon sequestration and wood production were evaluated on afforested farms by integrating the Gaussian diameter distribution model and exponential diameter-height model derived from sample plots of an afforested hardwood forest in Taiwan. The quantity of sequestrated carbon was determined based on aboveground biomass. Through pilot tests run on an age-volume model, an estimation bias was obtained and used to correct predicted volume estimates for a farm forest over a 20-year period. An estimated carbon sequestration of 11,254 t C was observed for a 189ha-hardwood forest which is...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Taiwan; Plantation on farm land; Carbon capture and storage; Aboveground biomass; Forest management.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162013000200006

Isotermas de adsorção de Freundlich para o crômio (III) em Latossolos
Provedor de dados: 63
Autores: Alcântara,Marco Aurélio Kondracki de; Camargo,Otávio Antonio de.
Os impactos causados no ambiente pela aplicação de resíduos de curtume contendo crômio em solos agrícolas devem ser estudados detalhadamente para que se evite a contaminação da biota e das águas subterrâneas. A adsorção do crômio ao solo reveste-se de especial importância em estudos de movimentação de solutos, uma vez que, se a capacidade adsortiva de um solo for ultrapassada, o metal fica potencialmente disponível para ser lixiviado. Os objetivos deste trabalho foram verificar a adequação da Isoterma de Freundlich em descrever a adsorção do crômio em Latossolos; analisar o comportamento da adsorção do crômio considerando-se os diferentes solos e horizontes, bem como de alguns de seus atributos químicos e físicos, como teores de óxidos e textura, e...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: LATOSSOLO; Crômio; Adsorção; Freundlich.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000300020

ON THE ESTIMATION AND PREDICTION IN MIXED LINEAR MODELS
Provedor de dados: 63
Autores: LÓPEZ,L.A.; IEMMA,A.F.
Beginning with the classical Gauss-Markov Linear Model for mixed effects and using the technique of the Lagrange multipliers to obtain an alternative method for the estimation of linear predictors. A structural method is also discussed in order to obtain the variance and covariance matrixes and their inverses.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Linear model; Mixes effect; Predictor; Estimator.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000200019

EFEITO DE ÉSTERES DE SACAROSE NO ARMAZENAMENTO DE TOMATES `SANTA CLARA'
Provedor de dados: 63
Autores: Kluge,R.A; Minami,K.
Tomates cultivar Santa Clara foram colhidos em 10/10/1995 e tratados com Semperfresh (ésteres de sacarose) a 0; 0,5; 1,0; 1,5 e 2,0%, imersão (1 minuto). Os frutos foram armazenados por 15 dias a 25oC e 70% UR. Os frutos tratados com Semperfresh apresentaram menor desenvolvimento de coloração e menores perdas de firmeza de polpa do que os não tratados. Não houve efeito sobre a perda de peso e os sólidos solúveis totais. Das concentrações utilizadas, o melhor resultado foi obtido com 2% de Semperfresh.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Armazenamento; Firmeza de polpa; Ésteres de sacarose; Tomates.
Ano: 1997
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161997000100006

Modelagem da ocorrência e da quantidade de chuva em Piracicaba
Provedor de dados: 63
Autores: Assis,F. Neto de; Villa Nova,N.A.
É proposto um modelo para descrever chuva diária de Piracicaba-SP em termos da sua ocorrência e da quantidade. Ambos, a ocorrência de dias com e sem chuva, quando considerados como seqüências de 31 dias a partir de determinada data, puderam ser bem representadas pela distribuição binomial negativa truncada, com parâmetros ajustados a uma função periódica com dois harmônicos. A quantidade de chuva nos dias com chuva, foi adequadamente ajustada à distribuição gama com o seu parâmetro de forma (gama) permanecendo constante mas o parâmetro de escala (beta) apresentando variação periódica que pode ser descrita por uma função com dois harmônicos. A análise dos dados mostrou que as séries de chuva de 1917 a 1944 e de 1945 a 1989, resultantes da mudança dos postos...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chuva; Precipitação pluviométrica; Distribuição gama; Distribuição binomial negativa truncada.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000100030

Revestimentos de fécula de mandioca, perda de massa e alteração da cor de frutos de pimentão
Provedor de dados: 63
Autores: Vicentini,Nívea Maria; Cereda,Marney Pascoli; Câmara,Francisco Luís de Araújo.
Uma proposta em estudo para minimizar as perdas pós-colheita, é o uso de revestimentos derivados da fécula de mandioca. Frutos de pimentão (Capsicum annuum L.) cultivar Magali, foram mergulhados (1 minuto) em suspensões a 1 e 3% de fécula geleificada, secos naturalmente ao ar e armazenados em condições ambientais onde a temperatura média do período variou de 20,2-21,8°C. O delineamento experimental foi inteiramente casualizado com 3 tratamentos, 6 repetições e 5 frutos por parcela. As análises de controle (perda de massa e alteração da coloração), foram feitas a cada dois dias por um período de 10 dias. Os frutos com película a 3%, apresentaram inibição no desenvolvimento da coloração vermelha; porém não houve efeito sobre a perda de massa.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Capsicum annuum; Pimentão; Amido; Filmes comestíveis.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000300028

Efeito do ácido indolbutírico no enraizamento de estacas de ramos de plantas de ameixeira (Prunus salicina, Lindl.)
Provedor de dados: 63
Autores: Kersten,E.; Lucchesi,A.A.; Gutierrez,L.E.
O presente trabalho foi realizado com o objetivo de avaliar o efeito de quatro concentrações de ácido indolbutírico (IBA), no enraizamento de estacas de ramos de ameixeira (Prunus salicina, Lindl.), coletadas de plantas tratadas com bórax e sulfato de zinco e controle, executado em quatro épocas. Os experimentos foram conduzidos em viveiros, sob condição de nebulização artificial intermitente. Os resultados obtidos mostram a influência de cultivar, época e concentração de IBA, não sendo verificado efeito de bórax ou sulfato de zinco na percentagem de estacas enraizadas.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ácido indolbutírico (IBA); Estacas; Enraizamento; Ameixeira.
Ano: 1993
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161993000100004

Analytical and numerical comparisons of two methods of estimation of additive × additive interaction of QTL effects
Provedor de dados: 63
Autores: Bocianowski,Jan.
Epistasis (additive × additive interaction) plays an important role in the genetic architecture of complex traits. This study presents analytical and numerical comparisons of two methods of estimation of additive × additive interaction of QTL effects. In the first method, we observed only the plant phenotype, while in the second method we have additional information from the molecular markers observations. In this study, two data sets were analyzed: i) 150 barley (Hordeum vulgare L.) doubled-haploid lines derived from the cross Steptoe × Morex and ii) 145 doubled-haploid lines of barley obtained from the cross Harrington × TR306. In total, 153 sets of observations were analyzed. The additive × additive interaction effect calculated on the basis of the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nonallelic interaction effect; Doubled haploid lines; Quantitative trait loci.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162012000400002

Development and soybean leaf consumption by Urbanus proteus proteus (L.)
Provedor de dados: 63
Autores: Nava,Dori Edson; Parra,José Roberto Postali.
Urbanus proteus proteus (L.) is a defoliating pest of legumes, causing damage mainly on soybean (Glycine max (L.) Merr.) and bean (Phaseolus vulgaris L.), and, being a minor pest, little is known about its bioecology. The objective of this paper was to study the larval and pupal development of the insect and the foliar consumption during its instars. Durations of 16.7; 1.1; 11.4 and 29.2 days were determined for the caterpillar, prepupal, and pupal stages, and the period from caterpillar-adult, respectively, with a total viability of 84.8%. The larval stage had five instars and the consumption of leaf area was 214.3 cm², with the consumption of the two last instars representing 96.9% of the total. Based on this value, the control level of the pest was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hesperiidae; Leaf consumption; Soybean pests; Control level; Bean leaf roller.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000400006

Atividade alelopática da leucena sobre espécies de plantas daninhas
Provedor de dados: 63
Autores: Pires,Nádja de Moura; Prates,Hélio Teixeira; Pereira Filho,Israel Alexandre; Oliveira Jr.,Rubem Silvério de; Faria,Trícia Cristina Lessa de.
Alelopatia é o efeito direto ou indireto de uma planta sobre outra, por meio da produção de compostos químicos liberados no ambiente. Os metabólitos secundários ou produtos naturais envolvidos em alelopatia são denominados aleloquímicos e estão presentes nos tecidos de diferentes partes das plantas. O objetivo deste trabalho foi determinar o potencial alelopático da leucena (Leucaena leucocephala (Lam.) de Wit.) sobre as plantas daninhas Desmodium purpureum (desmódio), Bidens pilosa (picão-preto) e Amaranthus hybridus (caruru). Os bioensaios foram conduzidos em laboratório e em casa de vegetação com extratos aquosos da parte aérea da leucena nas concentrações de 100, 50, 25, 12,5 % (v v-1). O extrato apresentou maior efeito quando aplicado em papel filtro....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Desmodium purpureum; Bidens pilosa; Amaranthus hybridus; Extrato de planta; Mimosina.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000100011

Input of sugarcane post-harvest residues into the soil
Provedor de dados: 63
Autores: Carvalho,João Luís Nunes; Otto,Rafael; Franco,Henrique Coutinho Junqueira; Trivelin,Paulo Cesar Ocheuze.
Sugarcane (Saccharum spp.) crops provide carbon (C) for soil through straw and root system decomposition. Recently, however, sugarcane producers are considering straw to be removed for electricity or second generation ethanol production. To elucidate the role of straw and root system on the carbon supply into the soil, the biomass inputs from sugarcane straw (tops and dry leaves) and from root system (rhizomes and roots) were quantified, and its contribution to provide C to the soil was estimated. Three trials were carried out in the State of Sao Paulo, Brazil, from 2006 to 2009. All sites were cultivated with the variety SP81 3250 under the green sugarcane harvest. Yearly, post-harvest sugarcane residues (tops, dry leaves, roots and rhizomes) were...
Tipo: Info:eu-repo/semantics/article
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162013000500008

Fator chave para Anticarsia gemmatalis Hübner, 1818 (Lepidoptera: Noctuidae) em cultura de soja, para o estado de São Paulo
Provedor de dados: 63
Autores: Botelho,Paulo Sérgio Machado; Silveira Neto,Sinval; Magrini,Eliana Aparecida.
Estudou-se a biologia e a flutuação de Anticarsia gemmatalis em campos de soja com o objetivo de construir tabelas de vida ecológica visando determinar o estágio e o fator chave. Os experimentos foram conduzidos durante os períodos agrícolas de 1992 a 1997. Em cada ano foram realizados dois estudos biológicos. Simultaneamente durante o ciclo da soja, nos seis anos estudados, foram realizadas amostragens para determinar a flutuação natural de ovos e de lagartas de A. gemmatalis. De posse desses dados foram construídas tabelas de vida ecológica, tendo-se observado que a taxa líquida de reprodução da espécie aumentou de 2,9 a 7,5 vezes em relação a população inicial, sendo que, para a tabela construída com a média dos dados, esse valor subiu para 15,5 vezes....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bioecologia; Lagarta-da-soja; Soja.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000400014

Biochar versus hydrochar as growth media constituents for ornamental plant cultivation
Provedor de dados: 63
Autores: Fornes,Fernando; Belda,Rosa M.
ABSTRACT Biochar and hydrochar have been proposed as novel materials for providing soilless growth media. However, much more knowledge is required before reliable advice can be given on the use of these materials for this purpose. Depending on the material and the technology applied (pyrolysis or hydrothermal carbonization), phytotoxicity and greenhouse gas emissions have been found for certain chars. In this study, our aim was to assess the feasibility of three chars as substrate constituents. We compared two biochars, one from forest waste and the other from olive mill waste, and a hydrochar from forest waste. We studied how chars affected substrate characteristics, plant performance, water economy and respiratory CO2 emission. Substrates containing...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Calendula officinalis; Petunia hybrida; Char; Growth media characteristics; Pyrolisis.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162018000400304

Biosolids and heavy metals in soils
Provedor de dados: 63
Autores: Silveira,Maria Lucia Azevedo; Alleoni,Luís Reynaldo Ferracciú; Guilherme,Luiz Roberto Guimarães.
The application of sewage sludge or biosolids on soils has been widespread in agricultural areas. However, depending on their characteristics, they may cause increase in heavy metal concentration of treated soils. In general, domestic biosolids have lower heavy metal contents than industrial ones. Origin and treatment method of biosolids may markedly influence their characteristics. The legislation that controls the levels of heavy metal contents in biosolids and the maximum concentrations in soils is still controversial. In the long-term, heavy metal behavior after the and of biosolid application is still unknown. In soils, heavy metals may be adsorbed via specific or non-specific adsorption reactions. Iron oxides and organic matter are the most important...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sewage sludge; Adsorption; Speciation; PH; Organic matter.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000400029

Sugarcane leaf area index modeling under different soil water conditions
Provedor de dados: 63
Autores: Teruel,D.A.; Barbieri,V.; Ferraro Jr.,L.A.
The knowledge of the Leaf Area Index (LAI) variation during the whole crop cycle is essential to the modeling of the plant growth and development and, consequently, of the crop yield. Sugarcane LAI evolution models were developed for different crop cycles, by adjusting observed LAI values and growing degree-days summation data on a power-exponential function. The resultant equations simulate adequately the LAI behavior during the entire crop cycle. The effect of different water stress levels was calculated in different growth periods, upon the LAI growth The LAI growth deficit was correlated with the ratio between actual evapotranspiration and máximum evapotranspiration, and a constant named kuu was obtained hi each situation. It was noticed that the kLAI...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Leaf Area Index; Sugarcane; Growing degree-days; Water stress; Modeling.
Ano: 1997
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161997000300008

Qualidade de bulbos de cebola em consequência de tratamentos pré-colheita
Provedor de dados: 63
Autores: Ferreira,Marcos David; Minami,Keigo.
Com o objetivo de se avaliar o efeito de tratamentos pré-colheita na qualidade de bulbos de cebola, através dos parâmetros perda de peso, espessura e coloração da casca, diâmetro e firmeza do bulbo, foi conduzido experimento em Paulínia, Estado de São Paulo, em 1997. Foram utilizados quatro tratamentos: testemunha; oxicloreto de cobre (250 g 100 L-1 de água); ácido bórico (250 g 100 L-1 de água); e a combinação dos dois últimos e seis cultivares: Serrana, Régia, Crioula e três híbridos da SVS, HT, HS-1 e HS-2. Os tratamentos foram aplicados durante a bulbificação. Os bulbos foram armazenados à temperatura ambiente (25ºC) e analisados periodicamente para os parâmetros citados. Os resultados permitiram observar que a aplicação pré-colheita do oxicloreto de...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cebola; Cor da casca; Resistência da casca; Micronutrientes.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000400015

Resposta à inoculação de fungo solubilizador de fósforo em milho
Provedor de dados: 63
Autores: Nahas,E.; Fornasieri,D. J.; Assis,L. C.
Este trabalho procurou verificar o efeito da adição de duas fontes de fosfato prontamente disponíveis, superfosfato triplo e fosfato solubilizado obtido por via microbiológica e uma fonte não prontamente disponível, apatita de Araxá, na cultura do milho. Em adição, foi verificado o efeito da inoculação do fungo Aspergillus niger, solubilizador de fosfato de rocha e da adição de matéria orgânica. Nos tratamentos em que se usou matéria orgânica, houve um aumento de população microbiana total do solo, mas nenhum efeito foi observado na produção e absorção de fósforo pela cultura do milho. Tanto o superfosfato triplo como a apatita de Araxá permitiram resultados mais favoráveis em termos de produção de massa seca e absorção de fósforo pelo milho em relação ao...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Solubilização de fosfato de rocha; Aspergillus niger; Milho.
Ano: 1994
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000300014

Production and body composition traits of broilers in relation to breast weight evaluated by path analysis
Provedor de dados: 63
Autores: Lorentz,Leandro Homrich; Gaya,Leila de Genova; Lunedo,Raquel; Ferraz,José Bento Sterman; Rezende,Fernanda Marcondes de; Michelan Filho,Tércio.
Breast weight has great economic importance in poultry industry, and may be associated with other variables. This work aimed to estimate phenotypic correlations between performance (live body weight at 7 and 28 days, and at slaughter, and depth of the breast muscle measured by ultrasonography), carcass (eviscerated body weight and leg weight) and body composition (heart, liver and abdominal fat weight) traits in a broiler line, and quantify the direct and indirect influence of these traits on breast weight. Path analysis was used by expanding the matrix of partial correlation in coefficients which give the direct influence of one trait on another, regardless the effect of the other traits. The simultaneous maintenance of live body weight at slaughter and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Animal breeding; Multivariate analysis; Phenotypic correlation; Poultry; Pre-selection.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000300008

AVALIAÇÃO DE METODOLOGIA ALTERNATIVA PARA O  TESTE DE TETRAZÓLIO PARA SEMENTES DE SOJA
Provedor de dados: 63
Autores: COSTA,N.P. da; FRANÇA NETO,J.B.; KRZYZANOWSKI,F.C.; HENNING,A.A.; PEREIRA,J.E.
Uma metodologia alternativa para o teste de tetrazólio, evidenciou a possibilidade de redução do período de embebição (pré-condicionamento) das sementes de 16 horas à 25ºC para 6 horas à 41ºC. Como a metodologia foi testada, até o momento, em um número limitado de cultivares, permaneceu a dúvida se o procedimento alternativo (6h/41ºC) era aplicável para uma gama maior de cultivares de soja. Assim sendo, executou-se a presente pesquisa onde foram avaliados três períodos de embebição (4h, 6h e 16 horas), duas temperaturas (41ºC e 25ºC) em sementes das cultivares BR-13, EMBRAPA 4, EMBRAPA 48, FT-Abyara, FT-5, IAS 5, OCEPAR 13, OCEPAR 14, OCEPAR 16 e OCEPAR 17. Os seguintes testes foram realizados: grau de umidade e tetrazólio (determinando-se os índices de...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Teste de tetrazólio; Glycine max ( L.) Merrill; Viabilidade; Vigor.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000200021

Chlorotic spots on Clerodendrum, a disease caused by a nuclear type of Brevipalpus (Acari:Tenuipalpidae) transmitted virus
Provedor de dados: 63
Autores: Kitajima,Elliot Watanabe; Kubo,Karen Sumire; Ferreira,Paulo de Tarso Oliveira; Alcântara,Berenice Kussumoto de; Boari,Alessandra Jesus; Gomes,Renata Takassugi; Freitas-Astua,Juliana; Rezende,Jorge Alberto Marques; Morais,Gilberto José de; Salaroli,Renato Barbosa.
Chlorotic spots have been observed in plants of Clerodendrum x speciosum growing in residential gardens and parks in Piracicaba, SP, Brazil. Thin sections of diseased tissues revealed characteristic cytopathic effects of the nuclear type of the Brevipalpus (Acari: Tenuipalpidae) mite-transmitted viruses (BTrV). Brevipalpus mites, identified as B. phoenicis, infesting symptomatic C. x speciosum plants transmitted the pathogen to healthy C. x speciosum and to C. thomsonae, Gomphrena globosa, Hibiscus cannabinus, H. coccineus, H. schizopetalus, Salvia leucantha, Spathiphyllum wallasi and Tetragonia expansa causing chlorotic spots on their leaves. Mechanical inoculation using leaf extracts from infected C. x speciosum resulted in chlorotic spots on inoculated...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brevipalpus phoenicis; Clerodendrum x speciosum; Host range; Transmission; Purification.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000100006

Mineral supplementation and productivity of the Shiitake mushroom on eucalyptus logs
Provedor de dados: 63
Autores: Queiroz,Elvio Cardoso; Marino,Regina Helena; Eira,Augusto Ferreira da.
Brazilian reports on Shiitake mushroom [Lentinula edodes (Berkeley) Pegler] productivity grown on Eucalyptus saligna (Sm.) logs are optimistic. The current production on this kind of wood is, however, low and variable. Aiming at increasing Shiitake mushroom productivity, the present work studied interactions among three concentrations of mineral supplement and three Shiitake strains (Le 95/01, 96/17 and 96/18) grown on seventh cut eucalyptus logs. Mineral fertilization was carried out when the logs were submerged in water to induce fruiting bodies, using the following saline concentrations: zero (no fertilizers added), 0.05% (equivalent to 0.35 g L-1 of ammonium sulfate with 18% nitrogen and 0.15 g L-1 of superphosphate with 34% phosphorus) and 0.50%....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lentinula edodes; Nitrogen; Phosphorus.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000300003

Assessing locomotion deficiency in broiler chicken
Provedor de dados: 63
Autores: Nääs,Irenilza de Alencar; Paz,Ibiara Correia de Lima Almeida; Baracho,Marta dos Santos; Menezes,Adriana Gomes de; Lima,Karla Andrea Oliveira de; Bueno,Leda Gobbo de Freitas; Mollo Neto,Mario; Carvalho,Victor Ciaco de; Almeida,Ianê Correia de Lima; Souza,Anderson Luiz de.
Locomotion deficiencies in broiler production cause poor welfare and lead to change in drinking and feeding behavior with consequent loss in weight gain. This research aimed to assess locomotion deficiencies in broiler chicken by analyzing the vertical peak force on both feet during walk. A chamber was built with an inlet ramp, a horizontal walkway in the middle and an outlet ramp. In the walkway a thin mat with piezoelectric crystal sensors was placed to record the step vertical peak force of the feet while walking on the force platform. The measurement system consisted of a mat with electronic sensors and software that allowed real time recording of the forces and the processing and analysis of data. Footage was taken from two digital video cameras and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Poultry production; Gait scoring; Feet force measurement; Welfare.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000200001

Equipamento experimental para determinação de isotermas de adsorção pelo método dinâmico
Provedor de dados: 63
Autores: Padro Filho,L.G.; Sabbagh,M.
Foi realizada a avaliação do desempenho de equipamento experimental para a determinação de curvas de umidade de equilíbrio - isoterma de adsorção - de farinhas pelo método dinâmico. Para o ajuste dos valores definidos (0,51; 0,57; 0,67; 0,75; 0,79 e 0,81) de atividade de água - Aa - na corrente de ar, foram usadas soluções saturadas de sais. A comparação da eficiência do equipamento, com e sem recirculação de ar, foi feita determinando-se a isoterma de adsorção de farinha de soja a 35°C. A versão com recirculação de ar permite a obtenção de dados de equilíbrio em elevados níveis de Aa, nos quais há perda das amostras por crescimento microbiano quando se emprega a versão sem recirculação. Os tempos necessários para a obtenção do equilíbrio da farinha com as...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Isoterma de adsorção; Atividade de água; Farinha de soja.
Ano: 1993
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161993000300019

Agriculture, habitat loss and spatial patterns of human occupation in a biodiversity hotspot
Provedor de dados: 63
Autores: Diniz-Filho,José Alexandre Felizola; Oliveira,Guilherme de; Lobo,Fábio; Ferreira,Laerte Guimarães; Bini,Luis Mauricio; Rangel,Thiago Fernando Lopes Valle Brito.
The Cerrado biome, the second largest biome in Neotropical region, consists of a mosaic of different habitat types, ranging from open grasslands to dense woodlands and dry forests. An intensive recent occupation process has transformed it into the most important region for cattle ranching and intensive commodity crops in Brazil. In this study, a macroecological approach was used to evaluate broad-scale spatial patterns of habitat loss in the Brazilian Cerrado, applying a series of spatial autocorrelation and partial regression analyses to understand how the proportion of remaining natural habitats is correlated with socio-economic variables, expressing different dimensions of human occupation and climatic variation. On average, 59% of the area is occupied...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: MODIS; Brazilian Cerrado; Spatial autocorrelation.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000600007

ATIVIDADE DE PEROXIDASES (EC 1.11.1.7) E TEOR DE PROLINA NO EMBRIÃO E COTILÉDONES DE FEIJOEIRO Phaseolus vulgaris L. EM CONDIÇÕES DE SALINIDADE
Provedor de dados: 63
Autores: LIMA,G.P.P.; ROSSI,C.; HAKVOORT,D.M.R.
Os efeitos da salinidade sobre a atividade de peroxidases foram acompanhadas no embrião e em cotilédones de feijoeiro Phaseolus vulgaris L. cv. Carioca, observando-se em ambos, aumento na atividade das enzimas. Com relação ao teor de prolina, ocorreu decréscimo constante no embrião de feijoeiro cultivado em condições salinas, entretanto, nos cotilédones, verificou-se aumento progressivo em condições de presença ou ausência de salinidade.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Feijoeiro; Peroxidases; Salinidade; Prolina.
Ano: 1997
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161997000200017

Efeito de misturas de turfa e bagaço-de-cana sobre a produção de mudas de maracujá e tomate
Provedor de dados: 63
Autores: Biasi,L.A.; Bilia,D.A.C.; São José,A.R.; Fornasieri,J. L.; Minami,K.
Com o objetivo de estudar a viabilidade da utilização de turfa e de bagaço-de-cana como substrato para a produção de mudas de tomateiro 'Rio Grande' e maracujá-amarelo realizou-se experimento, cujos tratamentos consistiram de turfa (100%), bagaço-de-cana (100%) e suas misturas em proporções volumétricas de 25, 5O e 75%. O delineamento experimental foi inteiramente casualizado com 4 repetições. A maior quantidade de bagaço-de-cana conferiu maior porosidade e aeração ao substrato, favorecendo a emergência do tomateiro e desfavorecendo a do maracujá-amarelo. Para esta espécie, a emergência foi melhor nos tratamentos com maiores porcentagens de turfa, onde a retenção de água pelo substrato foi superior. Entretanto, a utilização integral de cada um dos...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Maracujá-amarelo; Tomate; Passiflora edulis f.flavicarpa; Lycopersicon esculentum; Substrato.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000200006

Unit gradient in internal drainage experiments for the determination of soil hydraulic conductivity
Provedor de dados: 63
Autores: Reichardt,K.
It is theoretically shown that unit hydraulic potential gradients cannot occur in homogeneous soils undegoing internal drainage process even though this assumption has been used successfully by several authors of soil hydraulic conductivity methods.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil hydraulic conductivity; Unit gradient; Internal drainage.
Ano: 1993
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161993000100020

Eclosion time and larval behavior of the tomato fruit borer, Neoleucinodes elegantalis (Guenée) (Lepidoptera: Crambidae)
Provedor de dados: 63
Autores: Eiras,Alvaro E.; Blackmer,Jacquelyn L.
In several regions of Brazil, Neoleucinodes elegantalis (Guenée) is one of the most serious tomato pests. The moth lays eggs on the calyx or developing fruit, and shortly after eclosion larvae penetrate into the fruit, where they remain until pupation. Once larvae have entered the fruits, insecticides and biological control agents are relatively ineffective. Because N. elegantalis is most susceptible to conventional treatments when the larvae are outside the host tissues (or fruit), it would be advantageous to know the time required for egg development and the length of time that the larvae spend on the surface of the fruit. To answer these questions detailed behavioral studies were untaken. Eggs were collected from the field and maintained in an...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Insecta; Tomato; Tomato fruit borer; Larval behavior.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000100030

Ex-ante greenhouse gas balance of agriculture and forestry development programs
Provedor de dados: 63
Autores: Bernoux,Martial; Branca,Giacomo; Carro,Aude; Lipper,Leslie; Smith,Garry; Bockel,Louis.
EX-ACT (EX-Ante Carbon-balance Tool) is a tool developed by the Food and Agriculture Organization of the United Nations (FAO). It provides ex-ante measurements of the mitigation impact of agriculture and forestry development projects, estimating net C balance from GHG emissions and Carbon (C) sequestration. EX-ACT is a land-based accounting system, measuring C stocks, stock changes per unit of land, and CH4 and N2O emissions expressed in t CO2-eq per hectare and year. The main output of the tool is an estimation of the C-balance associated with the adoption of improved land management options, as compared with a "business as usual" scenario. EX-ACT has been developed using primarily the IPCC 2006 Guidelines for National Greenhouse Gas Inventories,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mitigation; Nitrous oxide; Methane; C sequestration; Land use change and forestry.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000100005

Total leaf area of papaya trees estimated by a nondestructive method
Provedor de dados: 63
Autores: Posse,Robson Prucoli; Sousa,Elias Fernandes de; Bernardo,Salassier; Pereira,Messias Gonzaga; Gottardo,Romildo Domingos.
Leaf area estimation is an important feature in physiological research involving predominantly photosynthesis, transpiration and growth. This study was carried out to develop a practical and nondestructive empirical mathematical model to estimate the area of one leaf and the total leaf area for papaya trees (Carica papaya L.). Two irrigated commercial orchards were evaluated over a period of 50 to 550 days after transplanting, during which the length of the leaf midrib (LM) varied from 0.04 to 0.60 m. A mathematical model was developed to estimate the area of one leaf for the papaya tree, taking into account LM and the age of the plant measured in days after transplanting. The model was considered satisfactory. Based on the average length of the last two...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Carica papaya L.; Papaya; Model; Leaf architecture; Biometry.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000400005

Geometria fractal em física do solo
Provedor de dados: 63
Autores: Bacchi,O.O.S.; Reichardt,K.
A geometria fractal tem sido aplicada nos mais diversos ramos da ciencia, mostrando grande potencial na descrição de estruturas altamente complexas. A sua aplicação em ciência do solo tem despertado grande interesse e vem se intensificando nos últimos anos. Apesar da sua divulgação através da literatura científica internacional, de conhecido acesso por parte dos pesquisadores brasileiros, o assunto parece não ter merecido ainda a nossa atenção, a contar pela ausência do tema em nossas revistas especializadas. Tratamos aqui da conceituação básica dessa nova abordagem e de algumas aplicações em física do solo.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fractal; Geometria fractal; Estrutura do solo; Composição granulométrica; Curva de retenção.
Ano: 1993
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161993000200021

Perennial herbaceous legumes as live soil mulches and their effects on C, N and P of the microbial biomass
Provedor de dados: 63
Autores: Duda,Gustavo Pereira; Guerra,José Guilherme Marinho; Monteiro,Marcela Teixeira; De-Polli,Helvécio; Teixeira,Marcelo Grandi.
The use of living mulch with legumes is increasing but the impact of this management technique on the soil microbial pool is not well known. In this work, the effect of different live mulches was evaluated in relation to the C, N and P pools of the microbial biomass, in a Typic Alfisol of Seropédica, RJ, Brazil. The field experiment was divided in two parts: the first, consisted of treatments set in a 2 x 2 x 4 factorial combination of the following factors: live mulch species (Arachis pintoi and Macroptilium atropurpureum), vegetation management after cutting (leaving residue as a mulch or residue remotion from the plots) and four soil depths. The second part had treatments set in a 4 x 2 x 2 factorial combination of the following factors: absence of live...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Microbial phosphorus; Manure green; Nutrients cycling.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000100021

Potential limitations for potato yields in raised soil field systems near Lake Titicaca
Provedor de dados: 63
Autores: Lozada,Diego Sánchez de; Baveye,Philippe; Lucey,Robert F.; Mamani,Ricardo; Fernandez,Walter.
During the last two decades, various non-governmental organizations have strongly encouraged Bolivian farmers in the Altiplano region near Lake Titicaca to resume the ancestral agricultural practice of constructing raised fields. In addition to improved drainage and possibilities this practice affords for sub-irrigation, advocated benefits of this system traditionally include frost mitigation and high crop yields. Until recently, reliable data to assess the extent of these benefits were unfortunately lacking. In this context, field experiments on raised fields were designed and carried out at two locations in the Bolivian Altiplano to obtain reliable potato yield and temperature data. Observed yields ranged from 2.73 to 10.80 t ha-1 at the first site,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Raised fields; Productivity; Frost mitigation; Crop.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000500005

Diversidade inter- e intra-específica e uso de análise multivariada para morfologia da mandioca (Manihot esculenta Crantz): um estudo de caso
Provedor de dados: 63
Autores: Peroni,Nivaldo; Martins,Paulo Sodero; Ando,Akihiko.
A agricultura itinerante, caracterizada por ciclos de uso e pousio, é uma técnica utilizada por muitos agricultores no mundo, assim como por agricultores tradicionais da região de Cananéia (SP). Estes agricultores herdaram toda um gama de conhecimentos transmitidos oralmente sobre a agricultura praticada por povos indígenas desde o período pré colonial. A mandioca é o principal cultivo neste sistema, o que a torna um organismo chave para entender as especificidades do sistema agrícola itinerante. Foram obtidas informações sobre as espécies cultivadas no sistema itinerante, e mais especificamente sobre as etnovariedades de mandioca. Entrevistas com os agricultores permitiram caracterizar o sistema utilizado, demonstrando que na propriedade estudada podem...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Agricultura itinerante; Mandioca (Manihot esculenta); Diversidade intra específica; Etnobiologia; Análise de agrupamento; Análise de componentes principais.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000300011

Nutrient losses by water erosion
Provedor de dados: 63
Autores: Bertol,Ildegardis; Mello,Eloy Lemos; Guadagnin,Jean Cláudio; Zaparolli,Almir Luis Vedana; Carrafa,Marcos Roberto.
Water erosion causes soil degradation, which is closely related to nutrient losses either in, the soluble form or adsorbed to soil particles, depending mainly on the adopted soil management system. This study was carried out in São José do Cerrito, SC, Brazil, between March 2000 and June 2001. The objective was to quantify available nitrogen, phosphorus, potassium, calcium and magnesium losses in water erosion obtained with simulated rainfall in the following soil management systems: conventional tillage with no-crop (bare soil) (BS), conventional tillage with soybean (CT), reduced tillage with soybean (RT), no tillage with soybean on a desiccated and burned natural pasture (DBNP), and no tillage with soybean on a desiccated natural pasture (DNP). A...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nutrient concentration; Water loss; Simulated rainfall.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000300025

Symbiotic nitrogen-fixing bacterial populations trapped from soils under agroforestry systems in the Western Amazon
Provedor de dados: 63
Autores: Jaramillo,Paula Marcela Duque; Guimarães,Amanda Azarias; Florentino,Ligiane Aparecida; Silva,Karina Barroso; Nóbrega,Rafaela Simão Abrahão; Moreira,Fatima Maria de Souza.
Cowpea (Vigna unguiculata) is an important grain-producing legume that can forego nitrogen fertilization by establishing an efficient symbiosis with nitrogen-fixing bacteria. Although inoculating strains have already been selected for this species, little is known about the genotypic and symbiotic diversity of native rhizobia. Recently, Bradyrhizobium has been shown to be the genus most frequently trapped by cowpea in agricultural soils of the Amazon region. We investigated the genetic and symbiotic diversity of 148 bacterial strains with different phenotypic and cultural properties isolated from the nodules of the trap species cowpea, which was inoculated with samples from soils under agroforestry systems from the western Amazon. Sixty non-nodulating...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Legume-nodulating bacteria; Biodiversity; Symbiotic promiscuity; Chlorophyll content.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162013000600004

INFLUÊNCIA DA POLINIZAÇÃO E DA MORFOLOGIA FLORAL NA FRUTIFICAÇÃO DE VARIEDADES DE LARANJA-DOCE
Provedor de dados: 63
Autores: Domingues,Edson Tobias; Tulmann Neto,Augusto.
A espécie de laranjas doces (Citrus sinensis [L.] osbeck) é citada como sendo autógama. No entanto a alogamia tem sido demonstrada pelo aumento da produção de frutos com o uso de polinizadores eficientes, assim como pela existência de bons híbridos inter-específicos e ausência de bons híbridos intra-específicos. Como os programas de melhoramento via hibridação sexual em laranja doce dependem de maiores estudos, buscou-se avaliar o prendimento de frutos em 34 diferentes variedades representativas da espécie, no banco de germoplasma de Citrus do Centro de Citricultura Sylvio Moreira do Instituto Agronômico de Campinas, sob diferentes tratamentos. Foi observado que 68% das variedades prenderam frutos sob polinização aberta, 15% sob auto-polinização, 35% após...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Citrus sinensis [L.] osbeck; Melhoramento genético; Polinização; Sistema reprodutivo.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000100023

Crude glycerin in anaerobic co-digestion of dairy cattle manure increases methane production
Provedor de dados: 63
Autores: Simm,Silvana; Orrico,Ana Carolina Amorim; Orrico Junior,Marco Antonio Previdelli; Sunada,Natália da Silva; Schwingel,Alice Watte; Mendonça Costa,Mônica Sarolli Silva de.
ABSTRACT Anaerobic digestion of crude glycerin (CG) along with animal waste has been an excellent option for increasing the production of biogas and methane to achieve efficiency in the treatment of both residues. This study aimed to evaluate improvements in specific productions of biogas and methane, reductions in solid and fibrous components in substrates prepared with dairy cattle manure and CG (containing 14 % glycerol). With these residues, experimental substrates were prepared and placed in 25 batch digesters. Initial content of the TS in the influent was 4 % and CG was added in increasing doses (0, 5, 10, 15 and 20 % relative to total solids (TS) of the influent). Results were submitted to ANOVA and orthogonal contrasts to assess the effects of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycerol; Biogas; Anaerobic digestion; Solids.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162017000300175

Neutron probe measurement of soil water content close to soil surface
Provedor de dados: 63
Autores: Falleiros,M.C.; Ravelo Sanchez,A.; Souza,M.Dornelas de; Bacchi,O.O.S.; Pilotto,J.E.; Reichardt,K.
The problem of neutron probe soil water content measurements close to soil surface is analysed from the spatial variability and also from the slow neutron "loss" to the atmosphere points of view. Results obtained on a dark red latosol of the county of Piracicaba,SP, indicate the possibility of precisely measuring the neutron "sphere of influence" when different media are used on soil surface.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Neutron probe; Soil water content; Spatial variability.
Ano: 1993
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161993000300002

Use of stable isotopes of carbon to detect coconut water adulteration
Provedor de dados: 63
Autores: Imaizumi,Vitor Massami; Sartori,Maria Márcia Pereira; Ducatti,Carlos; Venturini Filho,Waldemar Gastoni.
ABSTRACT: Industrialized coconut water may have been adulterated by adding sugar above the limit permitted by law. According to Brazilian law, industrialized coconut water can receive the maximum addition of 1 g of sugar per 100 mL of the drink. This work aimed to detect adulteration in industrialized coconut water produced in Brazil and measure the relative isotopic enrichment in fresh coconut water, using the techniques of stable isotopes of carbon. Fresh coconut water samples from 13 locations, industrialized coconut water samples of 17 different brands and cane sugar were analyzed by Isotope Ratio Mass Spectrometer coupled to an elemental analyzer. The relative isotopic enrichment found for fresh coconut water samples ranged from −26.40 to −23.76. From...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cocus nucifera L.; Beverage; Isotope analysis; Law; Fraud.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162019001300261

Ultrasonography as a predicting tool for carcass traits of young bulls
Provedor de dados: 63
Autores: Suguisawa,Liliane; Mattos,Wilson Roberto Soares; Oliveira,Henrique Nunes de; Silveira,Antônio Carlos; Arrigoni,Mário de Beni; Haddad,Cláudio Maluf; Chardulo,Luis Artur Loyola; Martins,Cyntia Ludovico.
Considerable resources have been allocated to support research in the development of non-invasive and non-destructive techniques for carcass composition and quality evaluation. Ultrasonography is a reliable and relatively low-cost technique that can be used. In the present study, real-time ultrasonography was used to predict ribeye area (REA) and subcutaneous fat thickness (FT) in live animals as compared to carcass measurements. Animals used were 115 yearling bull calves (initial body weight, 329 kg), kept under feedlot conditions, of four genetic groups (30, ½ Angus x Nellore; 30, ½ Canchim x Nellore; 30, ½ Simmental x Nellore, and 25 Nellore), and two finishing frame sizes (small and large). Four ultrasonographic measurements were taken every 28 days...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Beef cattle; Ribeye area; Fat thickness; Growth; Cross breeds.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000400026

Growth dynamics and yield of melon as influenced by nitrogen fertilizer
Provedor de dados: 63
Autores: Castellanos,María Teresa; Cabello,María Jesús; Cartagena,María del Carmen; Tarquis,Ana María; Arce,Augusto; Ribas,Francisco.
Nitrogen (N) is an important nutrient for melon (Cucumis melo L.) production. However there is scanty information about the amount necessary to maintain an appropriate balance between growth and yield. Melon vegetative organs must develop sufficiently to intercept light and accumulate water and nutrients but it is also important to obtain a large reproductive-vegetative dry weight ratio to maximize the fruit yield. We evaluated the influence of different N amounts on the growth, production of dry matter and fruit yield of a melon 'Piel de sapo' type. A three-year field experiment was carried out from May to September. Melons were subjected to an irrigation depth of 100% crop evapotranspiration and to 11 N fertilization rates, ranging 11 to 393 kg ha-1 in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: LAI; LAD; Dry matter accumulation; Production functions; Leaf nitrogen concentration.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000200009

Variability of soybean germplasm in relation to phosphorus uptake and use efficiency
Provedor de dados: 63
Autores: Furlani,Ângela Maria Cangiani; Furlani,Pedro Roberto; Tanaka,Roberto Tetsuo; Mascarenhas,Hipólito Assunção Antonio; Delgado,Margarida das Dores Paes.
Plant efficiency for phosphorus uptake and utilization may contribute to improve crop yield potential in situations of low P availability. Twenty nine soybean [Glycine max (L.) Merr.] cultivars were evaluated and classified in relation to the response to phosphorus (P) levels in nutrient solution. P uptake and use efficiency were estimated by the variables: shoot and root dry matter (DM) yield, P-concentrations and contents in plant parts and P-efficiency index (EI). The experiment was conducted in a greenhouse, during 1999, at Campinas, State of São Paulo, Brazil. The experimental design consisted of randomized complete blocks, arranged in split-plots, with three replications. The main plots were the P levels in the nutrient solution (64.5; 129; 258 and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycine max (L.) Merr.; Cultivar; P-efficiency index; P-uptake; P-use.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000300018

Hydro-physical characterization of soils under the Restinga Forest
Provedor de dados: 63
Autores: Cooper,Miguel; Boschi,Raquel Stucchi; Silva,Laura Fernanda Simões da; Toma,Raul Shiso; Vidal-Torrado,Pablo.
ABSTRACT: Knowledge of the hydraulic properties of the soil is of crucial importance to an understanding of the interactions between vegetation, soil and water. There is little information available about the hydraulic properties of Podzol soils found in tropical regions. The aim of this study was to present the soil morphology and hydraulic properties of a toposequence situated in a permanent plot at the Ilha do Cardoso State Park (Cananéia, SP, Brazil). Ultradetailed soil maps were used to define a toposequence inside the permanent plot. Five profiles, representing the main types of soil, were opened along the toposequence, in which Podzols are dominant. The levels of bulk density, sand content, porosity and permeability in these soils were all high....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Podzols; Soil morphology; Soil hydraulic properties.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162017000500393

Orbital spectral variables, growth analysis and sugarcane yield
Provedor de dados: 63
Autores: Simões,Maurício dos Santos; Rocha,Jansle Vieira; Lamparelli,Rubens Augusto Camargo.
Temporal analysis of crop development in commercial fields requires tools for large area monitoring, such as remote sensing. This paper describes the temporal evolution of sugar cane biophysical parameters such as total biomass (BMT), yield (TSS), leaf area index (LAI), and number of plants per linear meter (NPM) correlated to Landsat data. During the 2000 and 2001 cropping seasons, a commercial sugarcane field in Araras, São Paulo state, Brazil, planted with the SP80-1842 sugarcane variety in the 4th and 5th cuts, was monitored using nine Landsat images. Spectral data were correlated with agronomic data, obtained simultaneously to the imagery acquisition. Two methodologies were used to collect spectral data from the images: four pixels (2 × 2) window and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biomass; Leaf area index; Crop development analysis; Spectral behavior.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000400004

Yerba mate: cultivation systems, processing and chemical composition. A review
Provedor de dados: 63
Autores: Croge,Camila Pereira; Cuquel,Francine Lorena; Pintro,Paula Toshimi Matumoto.
ABSTRACT: The unique chemical composition of yerba mate and its functionalities suggest that it needs to be explored for its innovation potential. New uses may boost consumption, surpassing the traditional consumption barrier, and making yerba mate accessible on a global level. Thus, to highlight the importance of yerba mate as a potential source of agro-economic resources, we present a review on its botanical, ecological, agronomic, and industrial aspects, along with information on the biochemical composition of this species and its biological activity.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ilex paraguariensis; Natural product; Agro-economic resources.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000501801

Nitrogen-15 labeling of Crotalaria juncea green manure
Provedor de dados: 63
Autores: Ambrosano,Edmilson José; Trivelin,Paulo Cesar Ocheuze; Cantarella,Heitor; Rossetto,Raffaella; Muraoka,Takashi; Bendassolli,José Albertino; Ambrosano,Gláucia Maria Bovi; Tamiso,Luciano Grassi; Vieira,Felipe de Campos; Prada Neto,Ithamar.
Most studies dealing with the utilization of 15N labeled plant material do not present details about the labeling technique. This is especially relevant for legume species since biological nitrogen fixation difficults plant enrichment. A technique was developed for labeling leguminous plant tissue with 15N to obtain labeled material for nitrogen dynamics studies. Sun hemp (Crotalaria juncea L.) was grown on a Paleudalf, under field conditions. An amount of 58.32 g of urea with 70.57 ± 0.04 atom % 15N was sprayed three times on plants grown on eight 6-m²-plots. The labelled material presented 2.412 atom % 15N in a total dry matter equivalent to 9 Mg ha-1 This degree of enrichment enables the use of the green manure in pot or field experiments requiring...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: 15N -fertilizer; Labeled legumes; Green manure.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000100027

Study identifies factors affecting photosynthesis and leaf traits of Amazonian tree species
Provedor de dados: 63
Autores: Marenco,Ricardo A.
Tipo: Info:eu-repo/semantics/other
Ano: 2023
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010010400001

EFEITO DO GA3 NA GERMINAÇÃO DE SEMENTES DE KIWI (Actinidia chinensis Planch.)
Provedor de dados: 63
Autores: Ynoue,Cíntia Kuwahara; Ono,Elizabeth Orika; Marchi,Lia de Oliveira Santos.
Com o objetivo de analisar a aplicação de ácido giberélico (GA3) na germinação de sementes de Actinidia chinensis Pl, sementes foram extraídas de frutos maduros, lavadas e secas à sombra, recebendo os seguintes tratamentos: T1 - estratificação (5oC por 2 semanas); T2 - testemunha; T3 - GA3 à 50 mg.L-1 ; T4 - GA3 à 100 mg.L-1 e T5 - GA3 à 150 mg.L-1. Durante a primeira semana o substrato dos tratamentos T3, T4 e T5 foi umedecido com GA3. O tratamento mais efetivo para aumentar a porcentagem de germinação e diminuir o tempo médio de germinação foi com 150 mg.L-1 de GA3.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Actinidia chinensis; Porcentagem de germinação; Tempo médio de germinação.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000100002

Nitrogen supply to corn from sunn hemp and velvet bean green manures
Provedor de dados: 63
Autores: Ambrosano,Edmilson José; Trivelin,Paulo Cesar Ocheuze; Cantarella,Heitor; Ambrosano,Gláucia Maria Bovi; Schammass,Eliana Aparecida; Muraoka,Takashi; Guirado,Nivaldo; Rossi,Fabrício.
Due to their nitrogen fixation potential, legumes represent an alternative for supplying nutrients, substituting or complementing mineral fertilization in cropping systems involving green manuring. The objective of this study was to evaluate the N balance in a soil-plant system involving green manures [sunn hemp (Crotalaria juncea L.) and velvet bean (Mucuna aterrima Piper &amp;amp; Tracy)], both labeled with 15N. They were incorporated into two soils of contrasting textural classes: a clayey Eutrudox and a sandy-clayey Paleudalf, both cultivated with corn. The research was carried out in a greenhouse, using pots containing 6 kg of air dried soil, to which the equivalent to 13 Mg ha-1 dry matter of above-ground mass plus 2.7 or 2.2 Mg ha-1 of velvet bean...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Crotalaria juncea L. Mucuna aterrima Piper &amp;amp; Tracy mineralization 15N isotope dilution.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000300014

Orthogonal contrasts: definitions and concepts
Provedor de dados: 63
Autores: Nogueira,Maria Cristina Stolf.
The single degree of freedom of orthogonal contrasts is a useful technique for the analysis of experimental data and helpful in obtaining estimates of main, nested and interaction effects, for mean comparisons between groups of data and in obtaining specific residuals. Furthermore, the application of orthogonal contrasts is an alternative way of doing statistical analysis on data from non-conventional experiments, whithout a definite structure. To justify its application, an extensive review is made on the definitions and concepts involving contrasts.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Analysis of variance; Partition of sum of squares; Experiments with additional treatments.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000100020

Microenvironments in swine farrowing rooms: the thermal, lighting, and acoustic environments of sows and piglets
Provedor de dados: 63
Autores: Morello,Gabriela Munhoz; Lay Jr.,Donald C.; Rodrigues,Luiz Henrique Antunes; Richert,Brian T.; Marchant-Forde,Jeremy Neville.
ABSTRACT: The present research hypothesized that the thermal, lighting and acoustic environments in commercial swine farrowing rooms vary over time and from crate to crate. This study was conducted on 27 replicates in two commercial farrowing rooms in North Central Indiana, each equipped with 60 farrowing crates. Temperature, relative humidity, light intensity, sound intensity, and air velocity were continuously monitored and estimated for each crate at the sow level, for 48 h post-farrowing, which is usually a critical period for piglet survivability. Average daily temperature for all the crates in Room 1 was 24.1 ± 2.0 °C, 1.0 °C lower (p &lt; 0.05) than in Room 2. Although the overall mean temperature was similar between rooms and seasons, frequency...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Environmental controls; Swine production; Pig welfare; Microclimate; Farrowing crate.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162018000100001

Performance of two honey bee subspecies during harsh weather and Acacia gerrardii nectar-rich flow
Provedor de dados: 63
Autores: Awad,Awad Mohamed; Owayss,Ayman Ahmad; Alqarni,Abdulaziz Saad.
ABSTRACT Both climatic factors and bee forage characteristics affect the population size and productivity of honey bee colonies. To our knowledge, no scientific investigation has as yet considered the potential effect of nectar-rich bee forage exposed to drastic subtropical weather conditions on the performance of honey bee colonies. This study investigated the performance of the honey bee subspecies Apis mellifera jemenitica Ruttner (Yemeni) and Apis mellifera carnica Pollmann (Carniolan) in weather that was hot and dry and in an environment of nectar-rich flora. The brood production, food storage, bee population and honey yield of Yemeni (native) and Carniolan (imported) colonies on Talh trees (Acacia gerrardii Benth.), a nectar-rich, subtropical, and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Apis mellifera jemenitica; Bee forage; Beekeeping; Colony strengths subtropical.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162017000600474

Reguladores vegetais e a anatomia da folha de tomate (Lycopersicon esculentum Mill.) cv. Ângela Gigante
Provedor de dados: 63
Autores: Martins,Maria Bernadete Gonçalves; Castro,Paulo Roberto de Camargo e.
O objetivo do presente trabalho foi verificar os efeitos dos reguladores vegetais GA3 50 mg.l-1, NAA 100 mg.l-1, CCC 1500 mg.l-1 e SADH 3000 mg.l-1 em folhas de tomate, Lycopersicon esculentum Mill. cv. 'Ângela Gigante'. Os promotores de crescimento aumentaram o número de estômatos por milímetro quadrado na epiderme adaxial e diminuíram o número de células epidérmicas em ambos os lados da folha. Em relação ao controle, os retardantes de crescimento aumentaram em maior nível a espessura do parênquima lacunoso do que os promotores de crescimento.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Reguladores vegetais; Anatomia; Folha; Tomate.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000300026

Agro-morphological characterization of upland rice accessions
Provedor de dados: 63
Autores: Nascimento,Wellington Ferreira do; Silva,Edson Ferreira da; Veasey,Elizabeth Ann.
The agro-morphological characterization is fundamental in order to provide information for plant breeding programs. The aim of the present study was to characterize 146 accessions of upland rice (Oryza sativa L.), based on qualitative and quantitative agro-morphological descriptors. The experiment was conducted in Recife, state of Pernambuco, Brazil, using a randomized block design with three replicates. Polymorphism was observed among 12 of 14 qualitative characters evaluated, whereas significant differences (p &lt; 0.05) were observed for 11 of the 14 analysed quantitative traits. Genetic variance was higher than environmental variance and the average inheritability coefficients were above 80 % for all characters, which ensures the predominance of the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Genetic variability; Germplasm; Ex-situ conservation; Pre-breeding.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000600008

Estudo da embebição e da viabilidade de sementes de macadâmia (Macadamia integrifolia Maiden &amp;amp; Betche)
Provedor de dados: 63
Autores: Ono,E.O.; Rodrigues,J.D.; Sabino,J.C.; Pinho,S.Z. de.
O presente trabalho teve como objetivo, verificar o tempo de armazenamento necessário para que seja atingida a viabilidade máxima e o tempo de embebição máxima de sementes de macadâmia (Macadamia integrifolia Maiden &amp;amp; Betche var. IAC-4-20). As sementes foram pesadas e colocadas em recipientes com água para que ocorresse o processo da embebição, sendo realizada a pesagem a cada 6 horas. Pode-se concluir que a embebição foi máxima ao redor de 90 horas após o início da embebição. Para a análise da viabilidade das sementes, estas foram semeadas mensalmente, durante 12 meses a partir da colheita. Verificou-se que a viabilidade máxima das sementes é atingida, 4 meses após o início do armazenamento.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Noz-macadâmia; Sementes; Embebição.
Ano: 1993
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161993000100007

Genome selection in fruit breeding: application to table grapes
Provedor de dados: 63
Autores: Viana,Alexandre Pio; Resende,Marcos Deon Vilela de; Riaz,Summaira; Walker,Michael Andrew.
ABSTRACT Genomic selection (GS) has recently been proposed as a new selection strategy which represents an innovative paradigm in crop improvement, now widely adopted in animal breeding. Genomic selection relies on phenotyping and high-density genotyping of a sufficiently large and representative sample of the target breeding population, so that the majority of loci that regulate a quantitative trait are in linkage disequilibrium with one or more molecular markers and can thus be captured by selection. In this study we address genomic selection in a practical fruit breeding context applying it to a breeding population of table grape obtained from a cross between the hybrid genotype D8909-15 (Vitis rupestris × Vitis arizonica/girdiana), which is resistant...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: MAS; SSR markers; Linkage disequilibrium; Genomic selection.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000200142

Approaches to the indirect evaluation of germination and vigour
Provedor de dados: 63
Autores: Matthews,S.
In comparisons of six seed lots of different F1 hybrid cultivars of cauliflower with similarly high laboratory germinations (above 90%) separation in germination was achieved after controlled deterioration (C.D.) at 24% moisture content (m.c.) and 45 0C for 24 hours. This measure of vigour was related to the position of the lots on the seed survival curve and was highly predictive of the longevity of the lots when stored at 15% m.c. and 20 0C for 12 and 16 weeks. When each seed lot was deteriorated at 24% m.c. for increasing times (from 0 to 36 hours) a reduction in the subsequent percentage germination was seen, which, using probit transformed percentages, was significantly and linearly related to the leakage of electrolytes into seed soak water over 24...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cauliflower; Controlled deterioration; Leakage; Electrical conductivity; Storage.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000500011

Efeitos da suplementação de alto nível de cobre e de biotina na dieta de suínos de 8 a 20 kg
Provedor de dados: 63
Autores: Menten,J.F.M.; Ku,P.K.; Miller,E.R.
Dois experimentos foram conduzidos para investigar a necessidade de suplementação de biotina na dieta de leitões recém desmamados quando o cobre é utilizado como promotor de crescimento. Rações com níveis marginais de biotina (0,10 ppm), formuladas à base de trigo e farelo de soja, foram suplementadas ou não com 0,4 ppm de biotina (BIO) e 250 ppm de cobre (COB) e fornecidas a 168 leitões desmamados com 4 semanas de idade e peso médio de 7,8 kg. Os experimentos tiveram duração de 5 semanas. No experimento 1 houve uma interação BIO x COB (P &lt; 0,05) no ganho de peso dos leitões, com BIO promovendo uma melhora de 10% na ausência de COB, mas não na presença de COB; COB resultou em um aumento de 16% no ganho de peso na ausência de BIO, mas não em sua presença...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cobre; Biotina; Leitões desmamados.
Ano: 1992
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161992000400022

AVALIAÇÃO DE PRODUÇÃO E UTILIZAÇÃO DE UMA PASTAGEM DE CAPIM TOBIATÃ (Panicum maximum cv. Tobiatã) SOB PASTEJO ROTACIONADO
Provedor de dados: 63
Autores: Teixeira,Edmar Imperatrice; Mattos,Wilson Roberto Soares; Camargo,Arthur Chinellato de; Rosseto,Frederico A. de Andrade; Teixeira,Carmen Silvana Pires.
Durante o período experimental de novembro de 1995 a abril de 1996 variáveis como disponibilidade de MS da planta toda, do resíduo pós-pastejo e das perdas de pastejo de uma pastagem de capim Tobiatã foram avaliadas. O ciclo de pastejo foi de 34 dias (33 de descanso e 1 de ocupação) para o lote principal de vacas de leite. Os dados obtidos foram divididos em períodos de pastejo e esses comparados entre si pelos testes de variância do recurso Proc-GLM do pacote estatístico SAS. Observou-se uma queda crescente na eficiência de colheita da pastagem a medida que o ciclo avançou. Em contrapartida, a quantidade de resíduo pós-pastejo aumentou. Eficiências de pastejo de 68,57% e 18,82% foram observadas quando a quantidade de resíduo foi 1491,50 e 7917,90 kg MS/ha...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Panicum maximum; Tobiatã; Pastejo rotacionado; Eficiência de pastejo; Resíduo pós-pastejo; Produção de matéria seca.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000200013

Morphological characteristics of soybean root apexes as indicators of soil compaction
Provedor de dados: 63
Autores: Ramos,Julio César; Imhoff,Silvia Del Carmen; Pilatti,Miguel Ángel; Vegetti,Abelardo Carlos.
Plant soil compaction poses a serious problem to agriculture because it produces different types of changes in plant characteristics. No method has been implemented to date to use root morphological changes as indicators of soil compaction levels. Therefore, the aim of the present study was to evaluate whether or not the morphological changes in root apexes of soybean (Glycine max (L.) Merrill) can be used as indicators of soil compaction levels. To this end, a silt-loamy soil material (from a Typic Argiudoll, Esperanza series), sieved through a 2 mm mesh was used and the following soil bulk density levels were determined: 1.1, 1.3 and 1.5 g cm³ for which the corresponding mechanical resistances were &lt; 0.1, 0.5 and 3.5 MPa, respectively. The distance...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycine max; Mechanical impedance; Root indicator; Root hair.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000600013

INTERAÇÕES ENTRE MAGNÉSIO E MICRONUTRIENTES METÁLICOS DURANTE O DESENVOLVIMENTO DE FEIJOEIRO, EM SOLUÇÃO NUTRITIVA
Provedor de dados: 63
Autores: Boaro,Carmen Sílvia Fernandes; Moraes,José Antonio Proença Vieira de; Rodrigues,João Domingos; Ono,Elizabeth Orika; Curi,Paulo Roberto.
Este estudo avaliou as possíveis interações entre o magnésio e os micronutrientes manganês, zinco, cobre e ferro, pela determinação de seus teores nos diferentes órgãos do Phaseolus vulgaris L. cv "Carioca", nas 5 coletas, realizadas a cada 14 dias, a partir do 25o dia após a semeadura. As plantas foram cultivadas em solução nutritiva com nível completo (48,6 mg.L-1), baixos (2,4 e 24,3 mg.L-1) e elevados (72,9 e 97,2 mg.L-1) de Mg. O delineamento experimental foi inteiramente casualizado, em esquema fatorial. Com os níveis baixos de Mg, observou-se a diminuição do teor desse mineral nas raízes, caule e folhas e de Cu nas folhas e o aumento de Zn nas folhas e de Mn nas raízes. Com 97,2 mg.L-1 de Mg, observou-se o aumento desse elemento nas folhas,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phaseolus vulgaris; Magnésio; Micronutrientes; Interação entre elementos.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000100019

A crop model-based approach for sunflower yields
Provedor de dados: 63
Autores: Leite,João Guilherme Dal Belo; Silva,João Vasco; Justino,Flávio Barbosa; Ittersum,Martin K. van.
Pushed by the Brazilian biodiesel policy, sunflower (Helianthus annuus L.) production is becoming increasingly regarded as an option to boost farmers' income, particularly under semi-arid conditions. Biodiesel related opportunities increase the demand for decision-making information at different levels, which could be met by simulation models. This study aimed to evaluate the performance of the crop model OILCROP-SUN to simulate sunflower development and growth under Brazilian conditions and to explore sunflower water- and nitrogen-limited, water-limited and potential yield and yield variability over an array of sowing dates in the northern region of the state of Minas Gerais, Brazil. For model calibration, an experiment was conducted in which two...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Production systems; Family farms; Biodiesel crops; Climate classification.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162014000500001

Eficiência de absorção e utilização de fósforo (32P) por mudas de eucalipto e arroz
Provedor de dados: 63
Autores: Luca,Edgar Fernando de; Boaretto,Antonio Enedi; Muraoka,Takashi; Chitolina,José Carlos.
O conhecimento das habilidades das plantas em absorver o fósforo do solo e utilizá-lo no seu crescimento é uma via que pode ser importante para melhorar sensivelmente a eficiência da adubação fosfatada. Conduziu-se um experimento em casa-de-vegetação com objetivo de testar a hipótese de que o eucalipto é mais eficiente do que o arroz em absorver o fósforo de fontes poucos solúveis aplicadas a um Neossolo Quartzarênico, em função dos conceitos de eficiência. As fontes de fósforo Ca(H2(32)PO4).H 2O, CaH32PO4.2H2O e Ca3(32PO4)2 , sintetizadas em laboratório e identificadas por análises de difratometria de raios-X e térmica diferencial, foram utilizadas como traçadores isotópicos. O arroz foi mais eficiente em absorver o fósforo de fontes pouco solúveis,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Absorção de fósforo; Fertilizantes fosfatados; Síntese de fertilizantes fosfatados; Marcação isotópica.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000300020

TOLERÂNCIA AO ALUMÍNIO E CARACTERÍSTICAS AGRONÔMICAS EM POPULAÇÕES HÍBRIDAS DE TRIGO: ESTIMATIVAS DE VARIÂNCIA, HERDABILIDADE E CORRELAÇÕES
Provedor de dados: 63
Autores: Camargo,Carlos Eduardo de Oliveira; Ferreira Filho,Antonio Wilson Penteado.
Visando estimar a herdabilidade em sentido restrito para a tolerância ao Al3+, altura das plantas, comprimento da espiga, comprimento do internódio da raque e produção de grãos, bem como as correlações entre essas características, foram efetuados cruzamentos, em forma dialélica entre os cultivares 'BH-1146', tolerante ao Al3+ e de porte alto; 'IAC-161' e 'Anahuac' ambos de porte semi-anão, com média tolerância e sensibilidade à toxicidade de Al3+, respectivamente. Plântulas representando os pais, as gerações F1 e F2 e os retrocruzamentos para ambos os pais, foram testadas para a reação a 6 mg/L de Al3+ em solução nutritiva. As plantas, devidamente identificadas, foram transplantadas para vasos localizados no telado. Os valores da herdabilidade em sentido...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Trigo; Herdabilidade; Correlação; Tolerância ao alumínio; Características agronômicas.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000200027

Traffic effects on the soil preconsolidation pressure due to eucalyptus harvest operations
Provedor de dados: 63
Autores: Dias Junior,Moacir de Souza; Leite,Fernando Palha; Lasmar Júnior,Edson; Araújo Junior,Cezar Francisco.
One of the limitations for reaching sustainable forest development is related to the traffic of machines and vehicles during harvest operations and wood transport, which may cause soil structure degradation. Seeking a way to analyze this problem, the objective of this study was to determine the traffic effects due to harvest operations and wood transport, on the preconsolidation pressure (sigmap) in a Typic Acrustox cultivated with eucalyptus. This study was conducted using undisturbed soil samples collected at the 0.1-0.125 m depth. Undisturbed soil samples were used in the uniaxial compression tests. Soil sampling consisted of two stages, before and after the mechanized harvest operations. The traffic effects on the sigmap in the dry season indicated...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Forest soil compaction; Soil structure; Uniaxial compression test.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000300008

Dislodgeable residues of methamidophos in staked tomatoes
Provedor de dados: 63
Autores: Evaristo,Arlinda; Baptista,Gilberto Casadei de.
The measurement of dislodgeable pesticide residues is a way of estimating occupational exposure of farmers in their working environment. This study evaluates dislodgeable methamidophos residues on leaves, fruits and soil in staked tomatoes (Lycopersicon esculentum Mill), with the objective of estimating potential exposure. The experiment consisted of four treatments: application of methamidophos in a single rate of 0.6 g a.i. L-1 water; application of a double rate of 1.2 g a.i. L-1 water ; four applications of a single rate; and control. The first spraying in the four-application treatment was made at the beginning of fruit maturation. The later applications followed a 6-day schedule. Spraying of the treatments with one application was simultaneous to the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lycopersicon esculentum; Pesticide residue; Occupational exposure; Risk.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000300010

Dose letal de radiação gama para ovos de Corcyra cephalonica (Stainton, 1865) (Lepidoptera: Pyralidae), traça do arroz
Provedor de dados: 63
Autores: Duarte Aguilar,J.A.; Arthur,V.
O. experimento teve como objetivo observar os efeitos da radiação gama em ovos da traça do arroz, Corcyra cephalonica (STAINTON, 1865). As doses utilizadas no experimento foram; 0; 25; 50; 75; 100; 125; 150; 175; 200 Gy. O experimento foi conduzido em sala climatizada a 25 ± 2°C e 70 ± 10% de umidade relativa. Observou-se que as doses letais DL50 e DL100 para ovos provenientes de adultos criados em dieta artificial foram respectivamente de 16 e 75 Gy.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Radiação gama; Traça do arroz; Corcyra cephalonica; Dose letal.
Ano: 1994
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000100028

Grain yield and kernel crude protein content increases of maize hybrids with late nitrogen side-dressing
Provedor de dados: 63
Autores: Silva,Paulo Regis Ferreira da; Strieder,Mércio Luiz; Coser,Rúbia Patrícia da Silva; Rambo,Lisandro; Sangoi,Luís; Argenta,Gilber; Forsthofer,Everton Leonardo; Silva,Adriano Alves da.
Physiological changes incorporated into current maize hybrids suggest the occurrence of modifications in the nitrogen uptake dynamics, improving plant ability to uptake N during grain filling. This may justify late N side-dressing whenever environmental constraints prevent adequate nitrogen supply during crops vegetative development. This study evaluates effects of nitrogen fertilization at booting and silking on grain yield and kernel crude protein contents of commercial maize hybrids. Two experiments were set up in Eldorado do Sul, RS, during the 2001/2002 and 2002/2003 growing seasons. In 2001/2002, treatments were composed of two hybrids (Agroceres 303 and Pioneer 32R21), three nitrogen rates applied during maize vegetative development (30, 80 and 130...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays; Nitrogen; Fertilization timing; Productivity.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000500014

Adaptability and stability of fruit set and production of peach trees in a subtropical climate
Provedor de dados: 63
Autores: Citadin,Idemir; Scariotto,Silvia; Sachet,Marcos Robson; Rosa,Fábio José; Raseira,Maria do Carmo Bassols; Wagner Junior,Américo.
Brazilian peach breeding programs have been established to improve peach [Prunus persica (L.) Batsch] production, yield consistency, quality, and disease resistance. Every year several genotypes are selected and their traits must be assessed. This study aimed to evaluate adaptability and stability of fruit set and production of peach genotypes in a subtropical climate, using the GGE biplot methodology. The experimental design was completely randomized with three replicates (trees) in a factorial arrangement of 29 × 3 for genotype and growing season, respectively. The genotypes 'Conserva 1129', 'Rubimel', 'Kampai', 'Tropic Beauty', and 'Cascata 967' had the greatest adaptability and stability for fruit set. The genotypes 'Conserva 681', 'Santa Áurea',...
Tipo: Info:eu-repo/semantics/article
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162014000200007

Avaliação de métodos de estratificação para a quebra de dormência de sementes de erva-mate
Provedor de dados: 63
Autores: Cuquel,F. L.; Carvalho,M. L. M. de; Chamma,H.M.C.P.
Na tentativa de verificar o método de estratificação mais adequado para a quebra de dormência de sementes de erva mate (Ilex paraguariensis, St. Hil.), três lotes de diferentes procedências foram submetidos, durante 6 meses, a tratamentos de estratificação em ambiente não controlado em campo e sob condições variáveis de disponibilidade de luz, temperatura, ácido giberélico e de nitrato de potássio em laboratório. As avaliações da porcentagem de germinação foram efetuadas a cada dois meses, constatando que existem diferenças de respostas de lotes a métodos de estratificação. Os métodos de estratificação que envolveram alternância de luz e temperatura e adição de nitrato de potássio foram os mais indicados para reduzir o período de dormência de sementes de...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ilex paraguariensis St. Hil.; Sementes; Germinação; Dormência.
Ano: 1994
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000300006

Lethal concentration (CL50) of un-ionized ammonia for pejerrey larvae in acute exposure
Provedor de dados: 63
Autores: Piedras,Sérgio Renato Noguez; Pouey,Juvêncio Luís Osório Fernandes; Moraes,Paulo Roberto Rocha; Cardoso,Daniela Fençon.
Ammonia results from decomposition of effluents organic matter, e.g. feed wastes and fish faeces. Its un-ionized form can be toxic because diffuses easily through fish respiratory membranes, damaging gill epithelium and impairing gas exchanges. The objective of this work was determining the 96-hour CL50 of un-ionized ammonia for newly hatched pejerrey Odontesthes bonariensis larvae. Trials were set up completely randomized design, with three different concentration of un-ionized ammonia (0.57, 0.94, and 1.45 mg L-1 NH3-N) and a control treatment (n = 3). Experimental units were 20-L, aerated aquaria stocked with 20 larvae (average weight 3.9 mg). Pejerrey larvae exposed to un-ionized ammonia during 96 hours present 50% mortality at 0.71 mg L-1 NH3-N.
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Pejerrey; Odontesthes bonariensis; Toxicity; Nitrogen; Larvae.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000200011

Altos níveis dietéticos de cobre no desempenho e no colesterol sérico e muscular de frangos de corte
Provedor de dados: 63
Autores: Morais,Sonia Cristina Daróz de; Menten,José Fernando Machado; Brainer,Mônica Maria de Almeida; Vale,Marcos Martinez do.
O cobre, em níveis supranutricionais nas dietas de frangos de corte, atua como promotor do crescimento. Para avaliar as respostas no desempenho e no colesterol sérico e muscular de frangos de corte, 1200 pintos (600 machos e 600 fêmeas) receberam rações suplementadas com 50, 100 ou 150 mg kg-1 de cobre como citrato cúprico, ou 200 mg kg-1 de cobre como sulfato cúprico pentahidratado, ou uma dieta controle, não suplementada, em um experimento em blocos casualizados com três repetições e arranjo fatorial de cinco tratamentos e dois sexos. As rações, baseadas em milho e farelo de soja e adequadas em todos os nutrientes (12 mg kg-1 de cobre na dieta controle), e água foram fornecidas à vontade durante o experimento de 42 dias. Não houve efeito (P&gt;0,05) de...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Citrato cúprico; Colesterol; Frango de corte; Promotor de crescimento; Sulfato cúprico.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000100001

Soil physical quality of Mollisols quantified by a global index
Provedor de dados: 63
Autores: Ghiberto,Pablo Javier; Imhoff,Silvia; Libardi,Paulo Leonel; Silva,Álvaro Pires da; Tormena,Cassio Antonio; Pilatti,Miguel Ángel.
Indicators synthesizing the state of the structural quality and the function of the porous system are useful for assessing soil production capacity as well as the way it may serve natural ecosystems. This research aimed (i) to determine indicators of the state and function of the porous system, (ii) to use them to derive a global index to characterize the soil physical quality, and iii) to establish a reference pore-size distribution curve for Mollisols from the province of Santa Fe (Argentina). Sixty water retention curves (WRC) of A and B horizons of Mollisols, with clay varying between 119 and 538 g kg−1, organic matter between 5 and 40 g kg−1, and soil bulk density between 1.09 and 1.49 Mg m−3, were used. The indicators measured were: pore size...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Water release curve; Silty-loam; Macropore; Soil management.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162015000200167

Fenólicos e carotenóides totais em pitanga
Provedor de dados: 63
Autores: Lima,Vera Lúcia Arroxelas Galvão de; Mélo,Enayde de Almeida; Lima,Daisyvângela E. da Silva.
Em decorrência de uma ampla diversidade genética, a pitanga (Eugenia uniflora L.) apresenta cor que varia do alaranjado até o vermelho escuro quase negro. Em Pernambuco, no entanto, é comum encontrá-la com coloração laranja-avermelhada. Como muitos fitoquímicos presentes em frutos exibem propriedades antioxidantes, com destaque para carotenóides e compostos fenólicos, e frente a escassez de informações sobre seus teores em pitanga, objetivou-se quantificá-los nas seleções cujos frutos apresentam coloração vermelha e roxa. Assim, foram determinados espectrofotometricamente os teores de carotenóides e fenólicos totais nos frutos destas seleções nos estádios maduro e semi-maduro. Na pitanga roxa madura e em sua película também foram determinados os teores de...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Eugenia uniflora; Antocianinas; Fenólicos totais; Carotenóides totais; Estádios de maturação.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000300006

Elephant grass clones for silage production
Provedor de dados: 63
Autores: Santos,Rerisson José Cipriano dos; Lira,Mário de Andrade; Guim,Adriana; Santos,Mércia Virgínia Ferreira dos; Dubeux Junior,José Carlos Batista; Mello,Alexandre Carneiro de Leão de.
Ensiling warm-season grasses often requires wilting due to their high moisture content, and the presence of low-soluble sugars in these grasses usually demands the use of additives during the ensiling process. This study evaluated the bromatological composition of the fodder and silage from five Pennisetum sp. clones (IPA HV 241, IPA/UFRPE Taiwan A-146 2.114, IPA/UFRPE Taiwan A-146 2.37, Elephant B, and Mott). The contents of 20 Polyvinyl chloride (PVC) silos, which were opened after 90 days of storage, were used for the bromatological analysis and the evaluation of the pH, nitrogen, ammonia, buffer capacity, soluble carbohydrates, and fermentation coefficients. The effluent losses, gases and dry matter recovery were also calculated. Although differences...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pennisetum purpureum; Grass silage; Fermentation process; Fodder; Quality.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162013000100002

Factors affecting vegetable stand establishment
Provedor de dados: 63
Autores: Grassbaugh,E. M.; Bennett,M. A.
Several factors can influence stand establishment in vegetable crop production. Environmental conditions such as soil physical characteristics, temperature and moisture, various cultural practices, and diseases may all be limiting factors in establishing maximum stands and achieving the highest possible yields. Measures taken to increase stands include soil improvements, implementing cultural practices, and use of chemical and biological seed treatments. Combining seed treatments and cultural/tillage practices to minimize environmental constraints can lead to maximum stands and yields in the production of high quality vegetable crops.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Stand establishment; Priming; Biological control; Environmental stress.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000500021

Digital soil mapping using multiple logistic regression on terrain parameters in southern Brazil
Provedor de dados: 63
Autores: Giasson,Elvio; Clarke,Robin Thomas; Inda Junior,Alberto Vasconcellos; Merten,Gustavo Henrique; Tornquist,Carlos Gustavo.
Soil surveys are necessary sources of information for land use planning, but they are not always available. This study proposes the use of multiple logistic regressions on the prediction of occurrence of soil types based on reference areas. From a digitalized soil map and terrain parameters derived from the digital elevation model in ArcView environment, several sets of multiple logistic regressions were defined using statistical software Minitab, establishing relationship between explanatory terrain variables and soil types, using either the original legend or a simplified legend, and using or not stratification of the study area by drainage classes. Terrain parameters, such as elevation, distance to stream, flow accumulation, and topographic wetness...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: GIS; DEM; Soil survey; Terrain analysis.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000300008

Efficiency of aquatic macrophytes to treat Nile tilapia pond effluents
Provedor de dados: 63
Autores: Henry-Silva,Gustavo Gonzaga; Camargo,Antonio Fernando Monteiro.
The effluents from fish farming can increase the quantity of suspended solids and promote the enrichment of nitrogen and phosphorus in aquatic ecosystems. In this context, the aim of this work was to evaluate the efficiency of three species of floating aquatic macrophytes (Eichhornia crassipes, Pistia stratiotes and Salvinia molesta) to treat effluents from Nile tilapia culture ponds. The effluent originated from a 1,000-m² pond stocked with 2,000 male Nile tilapia Oreochromis niloticus. The treatment systems consisted of 12 experimental tanks, three tanks for each macrophyte species, and three control tanks (without plants). Water samples were collected from the: (i) fish pond source water, (ii) effluent from fish pond and (iii) effluents from the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Eichhornia crassipes; Pistia stratiotes; Salvinia molesta; Aquaculture; Nutrients.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000500003

Adição de Zn e absorção, translocação e utilização de Zn e P por cultivares de cafeeiro
Provedor de dados: 63
Autores: Reis Jr.,Roberto dos Anjos; Martinez,Hermínia E. P.
A crescente exigência de nutrientes, especialmente micronutrientes, pelos cultivares de café vem exigindo uma melhor compreensão da dinâmica desses nutrientes no sistema solo-planta. Com o objetivo de avaliar o efeito de concentrações de Zn (0,4 ; 1,3 e 2,3 mimol Zn L-1) na solução nutritiva sobre o crescimento, produção de matéria seca, eficiência de absorção, translocação e utilização de Zn e P em dois cultivares de café (Coffea arabica cv. Catuaí e Coffea canephora cv. Conilon), foi realizado um experimento sob delineamento inteiramente casualizado com esquema fatorial 3 × 2 (três doses de Zn e dois cultivares) com três repetições. Plantas de café dos dois cultivares estudados foram cultivadas em casa de vegetação, com solução nutritiva completa por 50...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: C. arabica cv. Catuaí; C. canephora cv. Conilon; Café.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000300019

Economic survey to support control decision for old world bollworm on processing tomatoes
Provedor de dados: 63
Autores: Sousa,Nayara Cristina Magalhães; Michereff-Filho,Miguel; Moita,Antônio Williams; Silva,Karla Fernanda Ayres de Souza; Silva,Paloma Alves; Torres,Jorge Braz.
ABSTRACT: Helicoverpa armigera (Hübner) regularly requires quick deployment of control practices due to its potential of causing yield loss of processing tomatoes. The monitoring of H. armigera adults using stick traps lured with sex pheromone was correlated to egg densities, larvae, and percentage of damaged fruits, aiming to subsidize control decisions only using the number of males caught in the traps since surveying pest stages or damaged fruits is laborious and costly. Surveys were carried out on 11 tomato fields (ca. 80 to 120 hectares each) for processing during the 2015 and 2016 crop seasons. The survey was initiated at the flowering stage with traps set up along the field borders 100 m distant each. Evaluations of adult male capture in the traps...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Heliothinae; Sex pheromone; Tomato pests; Monitoring.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000500801

Water restriction and physiological traits in soybean genotypes contrasting for nitrogen fixation drought tolerance
Provedor de dados: 63
Autores: Cerezini,Paula; Fagotti,Dáfila dos Santos Lima; Pípolo,Antonio Eduardo; Hungria,Mariangela; Nogueira,Marco Antonio.
ABSTRACT Biological nitrogen fixation (BNF) is essential to the economic viability of the soybean [Glycine max (L.) Merrill] crop in Brazil, but drought may impair the BNF processes. We evaluated physiological traits of nitrogen fixation drought-tolerant (NFDT) (R01-581F, R01-416F and R02-1325) and drought-susceptible (CD 215 and BRS 317) genotypes of soybean subjected to drought or regular water supply between 45 and 55 days after emergence, in an experiment under greenhouse conditions in pots containing non-sterile soil. R01-581F had more stable photosynthetic and transpiration rates, and higher intercellular CO2 levels under drought. Drought reduced the chlorophyll concentration in all genotypes, but with less intensity in R01-581F and R02-1325. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycine max; Abiotic stress; Nodulation; Total soluble sugars; Ureides.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162017000200110

Crop loading studies on ‘Caricia’ and ‘Eva’ apples grown in a mild winter area
Provedor de dados: 63
Autores: Castro,Damián César; Álvarez,Norma; Gabriel,Paola; Micheloud,Norma; Buyatti,Marcela; Gariglio,Norberto.
The crop load level of an apple (Malus × domestica Borkh.) tree impacts fruit yield and quality parameters, tree vigor and biennial bearing. The optimal crop load is that which allows for consistent annual cropping and fruit quality acceptable to the market. We evaluated the effect of crop load on yield and fruit quality of two low-chill apples cv. ‘Caricia’ and ‘Eva’, growing in a mild winter area. During 2010 and 2011 crop load was manually adjusted from 2 or 3 to 17 fruits cm−2 of trunk cross-sectional area (TCSA). Fruit yield was positively related to crop load in both cultivars but mean fruit weight diminished as the crop load increased. For both cultivars, the production of non-commercial and small-sized fruit increased, whereas production of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Malus domestica; Crop load; Hand thinning; Trunk cross-sectional area; Fruit quality.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162015000300237

Tipos polínicos coletados por Nannotrigona testaceicornis e Tetragonisca angustula (Hymenoptera, Apidae, Meliponinae)
Provedor de dados: 63
Autores: Carvalho,Carlos Alfredo Lopes de; Marchini,Luis Carlos.
Os tipos polínicos coletados no mesmo pasto apícola por Nannotrigona testaceicornis e Tetragonisca angustula (Hymenoptera, Apidae, Meliponinae) foram estudados e comparados durante dois meses em Piracicaba-SP, (22o43'S; 47o25'W; altitude: 580m). As massas de pólen foram obtidas através da captura de operárias que retornavam à colônia das 5:00 às 19:00 horas nos meses de outubro e novembro de 1996. Trinta e um tipos polínicos pertencentes a 22 famílias foram identificados, dos quais 22,58% foram coletados exclusivamente por N. testaceicornis, 35,48% por T. angustula e 41,94%, por ambas as espécies. As famílias Fabaceae, Liliaceae, Mimosaceae e Myrtaceae e as espécies Bulbine frutescens, Eucalyptus spp., Leucaena leucocephala e Tipuana tipu foram as mais...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Abelhas sem ferrão; Pólen; Plantas.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000300029

Resistance and susceptibility of mandarins and their hybrids to Alternaria alternata
Provedor de dados: 63
Autores: Pacheco,Camilla de Andrade; Martelli,Ivan Bortolato; Polydoro,Denis Augusto; Schinor,Evandro Henrique; Pio,Rose Mary; Kupper,Kátia Cristina; Azevedo,Fernando Alves de.
Caused by Alternaria alternata, Alternaria brown spot (ABS) is a major fungal disease of mandarins in Brazil, causing serious losses in commercial orchards of Ponkan tangerine (Citrus reticulata Blanco) and Murcott tangor [C. sinensis (L.) Osbeck × C. reticulata Blanco]. The response of 31 accessions/genotypes of mandarins and their hybrids to A. alternata, was evaluated in São Paulo state, Brazil. The incidence and severity of the disease in fruit were evaluated in the field, using diagrammatic scale, four times during 2008 and 2009. Based on these data, the area under the disease progress curve (AUDPC) was calculated. In parallel, in vivo and in vitro inoculations with A. alternata were made on leaves to confirm field results. Resistance and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Citrus spp.; Alternaria brown spot; Fungus.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162012000600007

Absorção de macronutrientes por porta-enxertos e cultivares de videira em hidroponia
Provedor de dados: 63
Autores: Albuquerque,Teresinha Costa Silveira de; Dechen,Antonio Roque.
A proposta deste trabalho foi detectar a capacidade de absorção de macronutrientes nos porta-enxertos de videira ‘Tropical‘ - IAC 313, ‘Jales‘ - IAC 572, ‘Campinas‘ - IAC 766, ‘Dog Ridge‘, ‘Salt Creek‘ e ‘Harmony‘ de possível utilização para as cultivares Thompson Seedless e Italia. Os porta-enxertos e as produtoras foram propagados por estacas semi-lenhosas com 2 gemas, enraizadas em areia grossa lavada até que o sistema radicular permitisse o transplantio para recipientes de 3L de volume, contendo 2 partes de sílica e 1 parte de areia grossa. As mudas foram uniformizadas através de poda, tanto do sistema radicular quanto da parte aérea. A solução nutritiva foi aplicada por irrigação em sistema fechado de gotejamento, acionado por temporizador. Quando as...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vitis sp.; Uva apirena; Porta-enxerto; Nutrição mineral; Vitis sp.; Seedless grapevines; Rootstock; Mineral nutrition.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000100022

Gibberellin and cytokinin effects on soybean growth
Provedor de dados: 63
Autores: Leite,Vagner Maximino; Rosolem,Ciro Antonio; Rodrigues,João Domingos.
Soybean is an important crop in Brazil. Nonetheless, there are no reports on the use of plant growth regulator potential in relation to this crop in the national literature. To better understand the role of these compounds, a pot experiment was carried out to study effects of GA3 and cytokinin on the vegetative growth of the soybean. GA3 (50 mg L-1) was applied as seed treatment, leaving plants with water application as control. GA3 (100 mg L-1) and cytokinin (30 mg L-1) were sprayed on leaves at the physiological stage V3/V4, and 15 days after, cytokinin (30 mg L-1), also as foliar spray. Seed treatment decreased plant emergence and initial soybean root growth, but as the season progressed, differences in root growth disappeared; plants were shorter, and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycine max; Gibberellic acid; Gibberellin; Aminopurin; Plant growth regulator.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000300019

Eficiência de ésteres de sacarose em ameixas (Prunus salicina, Lindl.) 'Santa Rosa' refrigeradas
Provedor de dados: 63
Autores: Kluge,R.A.; Cantillano,R.F.F.; Jorge,R.O.
Com o objetivo de avaliar o efeito do TAL-PROLONG (ésteres de sacarose), ameixas 'Santa Rosa' foram armazenadas por 21 dias a 0°C e 90-95% UR (+ 3 dias de comercialização simulada em temperatura ambiente). As doses do TAL-PROLONG utilizadas foram 0; 0,5; 1,0; 1,5 e 2,0%, aplicadas antes do armazenamento por imersão das frutas. As frutas tratadas com TAL-PROLONG apresentaram menores perdas de peso durante o armazenamento e comercialização simulada. Houve menor incidência de podridões e desintegração interna de polpa nas frutas tratadas com TAL-PROLONG, o qual foi também eficiente na manutenção da coloração das frutas.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ésteres de sacarose; Desintegração interna; Perda de peso; Ameixas; Prunus salicina; Armazenamento.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000300016

Production of streptomycete inoculum in sterilized rice
Provedor de dados: 63
Autores: Soares,Ana Cristina Fermino; Sousa,Carla da Silva; Garrido,Marlon da Silva; Perez,Jane Oliveira.
Actinomycetes are important plant disease control and growth promotion agents, which makes it necessary to develop technology to produce large quantities of inoculum for green-house and field work. The present study had the objective of evaluating the growth of several isolates of Streptomyces in sterile rice for inoculum production. The sterile rice was inoculated with isolates of S. thermotolerans, S. griseus subsp. griseus, Streptomyces sp. N0035, S. purpurascens, and Streptomyces sp., and incubated at 28 ± 2ºC. Five days after its inoculation, mycelial growth and sporulation was observed for all Streptomyces isolates on the rice grains. Twelve days after incubation, the colonized rice was transferred to envelopes of dark brown paper and let to dry in...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Actinomycetes; Biological control; Growth substrates.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000600013

Impact of castor meal on root-knot and free-living nematodes
Provedor de dados: 63
Autores: Ritzinger,Cecilia Helena Silvino Prata; De Ley,Paul; Ploeg,Antoon Teunis; McSorley,Robert; Tandingan De Ley,Irma.
Soil amendment may enhance soil quality as well as reduce plant-parasitic nematode. Despite the many applications already undertaken using castor meal, its efficiency in controlling root-knot nematodes (RKN, Meloidogyne incognita) when applied to melon (Cucumis melo) is still not clear. Three different amounts of castor meal (Ricinus communis) applied were evaluated in microplots planted with melon either with or without RKN. The impact of castor meal on soil free-living nematode communities was also determined. Total nematode genera richness was estimated as 37 for the entire set of microplots sampled across both sampling dates. Rarefaction analysis resulted in 12 collector's curves out of the total of 30 that reached the horizontal asymptote. Univariate...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bray-Curtis similarity measure; Nematode community; Trophic group; Univariate; Multivariate analyses.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162014000400003

Historical land-cover/use in different slope and riparian buffer zones in watersheds of the state of São Paulo, Brazil
Provedor de dados: 63
Autores: Silva,Alexandre Marco da; Nalon,Marco Aurélio; Kronka,Francisco José do Nascimento; Alvares,Clayton Alcarde; Camargo,Plinio Barbosa de; Martinelli,Luiz Antonio.
Information about the land cover of a region it is a key information for several purposes. This paper aimed to elaborate land-cover maps using digital satellite images obtained in 1997 from seven watersheds (Piracicaba, Moji-Guaçu, Alto Paranapanema, Turvo Aguapeí, Peixe, and São José dos Dourados) located in the State of São Paulo, southeastern Brazil. Additionaly, this study evaluated the relationship between land-cover and slopes of the terrain of the seven watersheds. A third objective was to estimate the percentage of riparian vegetation currently remaining along the streams in a 30-meter width buffer zone. Three research questions were posed: i) What is the dominant land-cover of these watersheds? ii) Is the riparian vegetation well preserved in the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Land planning; Land management; Geoprocessing; Catchments; Rivers.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000400003

Comportamento de variedades de arroz de sequeiro em diferentes populações de plantas, com e sem irrigação suplementar
Provedor de dados: 63
Autores: Santos,A.B. dos; Costa,J.D.
Visando determinar os efeitos do espaçamento entre linhas (30, 40 e 50 cm) e da densidade de semeadura (50, 100 e 150 sementes/m²) sobre o rendimento de grãos e algumas características biométricas de duas variedades de arroz (Oryza sativa L.), com e sem irrigação suplementar, foram conduzidos quatro experimentos em solo de cerrado, sendo dois com a variedade Araguaia e os outros com a 'Guarani'. A irrigação propiciou incremento de 90 e 35% no rendimento de grãos das v. Araguaia e Guarani, respectivamente, influenciando significativamente todas as características biométricas estudadas. A v. Guarani apresentou maior produção de grãos no menor espaçamento e na densidade de 130 sementes por m², e o seu índice de colheita (IC) foi correlacionado linear e...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Oryza sativa; Espaçamento entre linhas; Densidade de semeadura; Rendimento; Características biométricas; Irrigação.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000100002

FRACTAL SCALING OF PARTICLE AND PORE SIZE DISTRIBUTIONS AND ITS RELATION TO SOIL HYDRAULIC CONDUCTIVITY
Provedor de dados: 63
Autores: BACCHI,O.O.S.; REICHARDT,K.; VILLA NOVA,N.A.
Fractal scaling has been applied to soils, both for void and solid phases, as an approach to characterize the porous arrangement, attempting to relate particle-size distribution to soil water retention and soil water dynamic properties. One important point of such an analysis is the assumption that the void space geometry of soils reflects its solid phase geometry, taking into account that soil pores are lined by the full range of particles, and that their fractal dimension, which expresses their tortuosity, could be evaluated by the fractal scaling of particle-size distribution. Other authors already concluded that although fractal scaling plays an important role in soil water retention and porosity, particle-size distribution alone is not sufficient to...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Fractal; Particle size distribution; Pore size distribution; Soil water retention; Soil hydraulic conductivity.
Ano: 1996
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161996000200027

Erosão em sulcos, entressulcos e voçorocas em uma microbacia de Piracicaba (SP) intensivamente cultivada
Provedor de dados: 63
Autores: Montolar-Sparovek,Roberta Bottino; Vidal-Torrado,Pablo; Sparovek,Gerd.
A eficácia do planejamento conservacionista considerando Microbacias Hidrográficas depende, em parte, da adequação desta escala como unidade de planejamento. As formas de erosão e a sua distribuição na área devem ser suficientemente uniformes para permitir recomendações gerais, vinculadas à origem dos processos e perceptíveis pelos agricultores. O objetivo deste trabalho foi avaliar as formas de erosão entressulcos, sulcos e voçorocas e sua distribuição espacial em 1995/96 na Microbacia Hidrográfica do Ceveiro (1.990 ha), localizada em Piracicaba (SP). A intensidade da erosão em voçorocas representou apenas 11% da erosão total e a sua distribuição na área diferiu das outras formas. Assim, as estratégias do planejamento conservacionista devem abordar os...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Erosão entressulcos; Sulcos e voçorocas; Microbacia hidrográfica; Distribuição espacial.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000400013

Internal quality of eggs coated with whey protein concentrate
Provedor de dados: 63
Autores: Alleoni,Ana Cláudia Carraro; Antunes,Aloísio José.
The functional properties of foods can be preserved when they are coated with edible films, since both the loss of moisture and the transport of O2 and CO2 are reduced. The objectives of this work were: to compare weight loss, Haugh units, and albumen pH between fresh eggs and eggs coated with whey protein concentrate (WPC), under six storage periods (3, 7, 10, 14, 21 and 28 days), at 25°C. During the entire storage period, regardless of whether the eggs were coated or not, the Haugh unit values and the weight loss decreased, and differences between values from the first to the last period were lower for coated eggs. Albumen pH increased. The Haugh unit values for coated eggs were similar to those found in literature references when the same storage period...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: WPC coating; Egg quality; Haugh unit; Weight loss.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000300006

Vegetative growth and yield of strawberry under irrigation and soil mulches for different cultivation environments
Provedor de dados: 63
Autores: Pires,Regina Célia de Matos; Folegatti,Marcos Vinícius; Passos,Francisco Antonio; Arruda,Flávio Bussmeyer; Sakai,Emílio.
The vegetative growth and yield of strawberry in relation to irrigation levels and soil mulches are still not well known, mainly for different environmental conditions. Two experiments were carried out in Atibaia, SP, Brazil, during 1995, one in a protected environment and the other in an open field, to evaluate the cultivar Campinas IAC-2712, under different irrigation levels and soil mulches (black and clear polyethylene). Three water potential levels in the soil were used in order to define irrigation time, corresponding to -0.010 (N1), -0.035 (N2), and -0.070 (N3) MPa, measured through tensiometers installed at the 10 cm depth. A 2 × 3 factorial arrangement was adopted, as randomized complete block, with 5 replicates. In the protected cultivation, the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fragaria &amp;times; Ananassa Duch.; Trickle irrigation; Water management; Greenhouse.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000500001

Parcelamento e largura da faixa de aplicação da uréia na recuperação do nitrogênio pela planta de milho
Provedor de dados: 63
Autores: Villas Bôas,Roberto Lyra; Boaretto,Antonio Enedi; Bull,Leonardo Theodoro; Guerrini,Irae Amaral.
Com o objetivo de estudar o parcelamento e a largura da faixa de aplicação como meios para aumentar a recuperação pelo milho do nitrogênio da uréia aplicada em superfície, foi conduzido no ano agrícola 93/94, em um Latossolo Vermelho Escuro, em condições de campo, um experimento delineado em blocos ao acaso, com cinco repetições. Sete tratamentos foram utilizados: testemunha (sem N em cobertura); aplicação de N parcelada (50 kg ha-1 de N aos 38 dias após semeadura - d.a.s e 50 kg ha-1 de N aos 60 d.a.s.) para faixas de 10, 20 e 40 cm; aplicação de N (100 kg ha-1 de N aos 38 d.a.s.) para faixas de 10 e 40 cm e, aplicação de N parcelada (50 kg de N/ha aos 38 d.a.s. e 50 kg ha-1 de N aos 60 d.a.s.) para faixa de 20 cm de largura, neste caso, uréia granulada....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays; Nitrogênio; Uréia; Aplicação em faixa.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000500020

Adaptation of the C4 grass Panicum maximum to defoliation is related to plasticity of N uptake, mobilisation and allocation patterns
Provedor de dados: 63
Autores: Santos,Patricia Menezes; Thornton,Barry; Corsi,Moacyr.
Dry mass production and persistence of Panicum maximum pastures depends on nitrogen supply. Defoliation influences N uptake and allocation patterns yet its effects on plasticity of N dynamics in P. maximum have not been investigated. Stable isotopes of N (15N) were used in order to test the hypothesis that defoliation in terms of proportion of the leaf area removed effects N mobilisation, uptake and allocation patterns in P. maximum. The plants were initially cut weekly to a height of either 0.15 m or 0.30 m for seven weeks. Eight weeks after the first defoliation, all plants were defoliated for a final time to remove 0, 25, 50, 75 or 100 % of the area of each individual leaf blade of the main tiller. Root N uptake was reduced when all leaf area was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Clipping height; Guineagrass; Organic reserves; Regrowth; Tropical grass.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162012000500002

Resistência de genótipos de batata a Phthorimaea operculella (Zeller)
Provedor de dados: 63
Autores: Lopes,Maria Teresa do Rêgo; Vendramim,José Djair.
A traça Phthorimaea operculella (Zeller) é considerada atualmente uma das principais pragas da batata. O uso de resistência varietal para controle desse inseto é uma alternativa promissora, mas que ainda precisa ser melhor pesquisada. A resistência de genótipos de batata à traça foi avaliada, em condições de laboratório, analisando-se o efeito de folhas e tubérculos sobre a biologia do inseto. Comparou-se também o desenvolvimento da traça em folhas de batata e tomate. Os experimentos foram conduzidos com os clones de batata NYL 235-4 e N 140-201 (ambos com tricomas glandulares tipo A nas folhas), as cultivares Aracy, Apuã e Itararé e a cultivar de tomate Santa Clara. Os insetos foram criados em folíolos e tubérculos dos genótipos, avaliando-se a duração e...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Solanum tuberosum; Traça-da-batatinha; Biologia; Tricomas; Tubérculos.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000200004

FLUTUAÇÃO POPULACIONAL DE Dione juno juno (Cramer, 1779) (Lepidoptera: Nymphalidae) EM MARACUJAZEIROS (Passiflora spp.), MÉTODOS DE AMOSTRAGEM E RESISTÊNCIA DE GENÓTIPOS
Provedor de dados: 63
Autores: Boiça Júnior,Arlindo Leal; Lara,Fernando Mesquita; Oliveira,João Carlos.
A pesquisa foi desenvolvida por um período de três anos (1991/94), em condições de campo, em Jaboticabal, SP, objetivando-se verificar a época do ano de maior ocorrência de Dione juno juno, avaliar métodos de amostragem e a resistência de genótipos de maracujazeiro (Passiflora spp.) ao seu ataque. Utilizaram-se doze genótipos entre espécies e híbridos. Os levantamentos foram realizados quinzenalmente, anotando-se o número de lagartas, o número total de folhas e o número de folhas atacadas por 0,25 m2 , e também em 1,5 m linear de espaldeira. Os resultados mostraram que a ocorrência de D. juno juno foi maior no inverno, com pico populacional em julho, seguindo-se da primavera e o verão, com pico em dezembro. As amostragens do número de folhas atacadas por...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Insecta; Resistência de plantas; Flutuação populacional.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000200025

Alterações bioquímicas e fisiológicas em sementes de milho causadas pelo ao envelhecimento acelerado
Provedor de dados: 63
Autores: Spinola,Maria Cristina Mingues; Cícero,Silvio Moure; Melo,Murilo de.
Para avaliar possíveis alterações bioquímicas (análises eletroforéticas de proteínas totais e das isoenzimas peroxidase, fosfatase ácida e malato desidrogenase) e fisiológicas (germinação e vigor) que ocorrem nas sementes de milho durante a permanência das mesmas nas condições recomendadas na metodologia do teste de envelhecimento acelerado (41ºC e 100% UR), foi realizada a presente pesquisa. Utilizaram-se sementes de milho, híbrido AG122, provenientes de quatro lotes. Os períodos 0, 24, 48, 72, 96 e 120 horas de permanência das sementes na incubadora (envelhecimento acelerado) definiram os tratamentos. As alterações nos perfís isoenzimáticos (fosfatase ácida e peroxidase) detectadas nas sementes, a partir do período 72h de envelhecimento acelerado,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays; Eletroforese; Germinação; Vigor.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000200011

Irrigação e adubação nitrogenada em milho
Provedor de dados: 63
Autores: Araújo,Wellington Farias; Sampaio,Regynaldo Arruda; Medeiros,Roberto Dantas de.
O objetivo deste estudo foi avaliar o efeito das lâminas de irrigação e da adubação nitrogenada sobre alguns componentes de crescimento, produção e rendimento do milho (BR 201) no Estado de Roraima-BR. O delineamento experimental foi o de blocos ao acaso, arranjados em um esquema de parcelas subdivididas com 16 tratamentos e 4 repetições. As parcelas foram constituídas pelas lâminas de irrigação de 392,6mm; 337,6mm; 282,6mm e 227,6mm e nas subparcelas, pela adubação nitrogenada (0, 50, 100 e 150 kg ha-1 de N ). A altura de plantas foi influenciada apenas pela lâmina de irrigação. A massa de 100 grãos, o número de espigas ha-1 e o rendimento foram influenciadas pela lâmina de irrigação e níveis de nitrogênio, sem apresentar efeitos na interação. O teor de N...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays; Cerrado; Roraima.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000400018

Lâminas de água e doses de nitrogênio na produção de aveia (Avena sativa L.) para forragem
Provedor de dados: 63
Autores: Frizzone,J. A.; Teodoro,R. E. F.; Pereira,A. S.; Botrel,T. A.
Foi realizado experimento visando estudar os efeitos da irrigação suplementar e da adubação nitrogenada na produtividade de aveia (Avena sativa L.), variedade UPF7, para ferragem. O delineamento experimental foi o de blocos ao acaso com parcelas subdivididas, com quatro repetições. Os tratamentos constaram da combinação de quatro lâminas de irrigação aplicadas quando a evaporação acumulada no tanque "Classe A" (ECA) atingia aproximadamente 30 mm (I = 0%, I = 50%, I = 100% e I = 150% de ECA) e quatro níveis de adubação nitrogenada (N = O, N = 80, N = 160 e N = 240 kg.ha-1 de nitrogênio). A máxima produtividade total de matéria seca (6,9 Lha-1) foi estimada para 319,2 mm de água e 152,4 kg.ha-1 de nitrogênio. Aos preços considerados para insumos e produto, a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Irrigação suplementar; Adubação nitrogenada; Níveis ótimos; Receita líquida.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000300027

Resistance and differential susceptibility of Bidens pilosa and B. subalternans biotypes to ALS-inhibiting herbicides
Provedor de dados: 63
Autores: López-Ovejero,Ramiro Fernando; Carvalho,Saul Jorge Pinto de; Nicolai,Marcelo; Abreu,Aluana Gonçalves; Grombone-Guaratini,Maria Tereza; Toledo,Roberto Estevão Bragion; Christoffoleti,Pedro Jacob.
The frequent application of herbicides in agricultural areas may select resistant biotypes in weed populations, whose biological characteristics influence the speed and patterns of resistance. This research aims to charactere, simultaneously, resistance patterns and differential susceptibility of Bidens pilosa and B. subalternans biotypes to ALS-inhibiting herbicides of the imidazolinone and sulfonylurea chemical groups. Six hairy beggarticks biotypes, four suspected resistant and two known susceptible, were treated with eight rates of chlorimuron-ethyl or imazethapyr, in greenhouse conditions. Percent control and percent fresh weight of the plants were evaluated at 28 days after the application. B. subalternans is less susceptible to ALS-inhibiting...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Imidazolinone; Sulfonylurea; Hairy beggarticks; Soybean.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000200005

Modelos de dupla camada difusa de Gouy-Chapman e Stern aplicados a latossolos ácricos paulistas
Provedor de dados: 63
Autores: Alleoni,L.R.F.; Camargo,O.A. de.
Modelos teóricos da dupla camada difusa de Gouy-Chapman e de Stern foram aplicados a um latossolo variação Una ácrico, de Guaira e a dois latossolos roxos ácricos, localizados em Ribeirão Preto e Guaíra, cidades ao norte do Estado de São Paulo, onde solos com caráter ácrico ocupam vasta área nas quais são cultivadas várias culturas de interesse econômico. Na concentração mais elevada do eletrólito suporte (KCl 0,1N), os dados obtidos em laboratório adaptaram-se melhor ao modelo de Stern. Entretanto, nas menores concentrações (KCl 0,01 e 0,001N), correspondentes a valores mais comuns encontrados em solos altamente intemperizados, o modelo de Gouy-Chapman representou melhor a variação da densidade superficial de carga com o potencial elétrico das amostras...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Solos ácricos; Dupla camada difusa; Modelos de Gouy-Chapman e Stern.
Ano: 1994
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000200018

Mineralogy, magnetic susceptibility and geochemistry of Fe-rich Oxisols developed from several parent materials
Provedor de dados: 63
Autores: Camêlo,Danilo de Lima; Ker,João Carlos; Fontes,Maurício Paulo Ferreira; Costa,Antonio Carlos Saraiva da; Corrêa,Marcelo Metri; Leopold,Matthias.
ABSTRACT: Fe-rich Oxisols on mafic rocks in Brazil generally have high magnetic susceptibility with high contents of some trace elements. These are taxonomically similar soils; however, differences in magnetic and geochemical properties may affect agricultural or environmental usability and subsequent management. This study investigated the pedogenesis of Fe-rich Oxisols from various parent materials and evaluated the lithogenetic influence on magnetic susceptibility and trace elements contents. Soil samples were collected from Bw horizons in 13 Rhodic Oxisols and a Typic Oxisol developed from several parent materials in Minas Gerais State, Brazil. Soils were analyzed by X-ray diffractometry (XRD) and magnetometry. Soil chemical analyses consisted of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Magnetic soils; Iron oxides; Ferrimagnetic minerals; Trace elements; Mafic rocks.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162018000500410

Potassium leakage and maize seed physiological potential
Provedor de dados: 63
Autores: Miguel,Mariane Victorio de Carvalho; Marcos Filho,Julio.
Seed production usually requires fast decisions to improve the efficacy of seed handling during harvesting, processing and storage. Seed technologists have focused on the development or improvement of procedures which allow rapid and consistent identification of higher quality seed lots. This research verified the effectiveness of the potassium leachate test on the evaluation of the physiological potential of maize seeds in comparison to recommended seed vigor tests. Five seed lots of the hybrid Avant were submitted to the potassium leachate, standard germination, first count, accelerated aging, electrical conductivity, field emergence and cold tests. The amount of potassium leachate was determined after seed imbibition for 30, 60, 90, 120, 150 and 180...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays; Seeds; Analysis; Vigor.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000200017

Automatic controller to water plants
Provedor de dados: 63
Autores: Medici,Leonardo Oliveira; Rocha,Hermes Soares da; Carvalho,Daniel Fonseca de; Pimentel,Carlos; Azevedo,Ricardo Antunes.
Despite the massive demand of water for plant irrigation, there are few devices being used in the automation of this process in agriculture. This work evaluates a simple controller to water plants automatically that can be set up with low cost commercial materials, which are large-scale produced. This controller is composed by a ceramic capsule used in common domestic water filters; a plastic tube around 1.5 m long, and a pressostate used in domestic washing machines. The capsule and the pressostate are connected through the tube so that all parts are filled with water. The ceramic capsule is the sensor of the controller and has to be placed into the plant substrate. The pressostate has to be placed below the sensor and the lower it is, the higher is the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Irrigation; Water tension; Automation; Low cost.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000600016

Atributos de solos tropicais e a sorção de imazaquin
Provedor de dados: 63
Autores: Regitano,Jussara Borges; Alleoni,Luís Reynaldo Ferracciú; Tornisielo,Valdemar Luiz.
O imazaquin é um herbicida com caráter ácido, de uso intensivo no Brasil para controlar plantas daninhas associadas à cultura da soja. Estudou-se a sorção do imazaquin e a sua relação com a CTC, o pH e os teores de carbono orgânico (Corg) e argila de onze amostras de solos tropicais. Para a obtenção das isotermas de sorção, soluções de imazaquin nas concentrações de 0,53; 0,88; 1,45; 2,71 e 5,20 mg mL-1 foram preparadas em CaCl2 0,005 mol L-1 com a adição de um traçador radioativo (14C-imazaquin). O coeficiente de sorção (Kf) foi calculado a partir da equação linearizada de Freundlich. A sorção do imazaquin variou de baixa a moderada (Kf &lt;3,0), exceto no Gleissolo. O teor de Corg e o pH da solução foram os principais atributos do solo correlacionados...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Kf; Retenção; Herbicida; Correlação; Carbono orgânico; PH.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000400023

Efficiency of foliar application of sparingly soluble sources of boron and zinc in citrus
Provedor de dados: 63
Autores: Macedo,Luiza Oliveira; Mattos Júnior,Dirceu; Jacobassi,Rodrigo; Hippler,Franz Walter Rieger; Quaggio,José Antônio; Boaretto,Rodrigo Marcelli.
ABSTRACT This study evaluated leaf supply of zinc (Zn) and boron (B) using either soluble or sparingly soluble fertilizers in young sweet orange trees. Three experiments were set up in a greenhouse to compare two sources and four doses (control, low, adequate and high) of fertilizers as follows: (i) Experiment I (B): boric acid and calcium borate; (ii) Experiment II (Zn): Zn sulfate and Zn oxide; and (iii) Experiment III (B + Zn): boric acid + Zn Sulfate and Zn Borate. The sparingly soluble sources were effective in increasing the Zn and B leaf concentration. Dry matter of the aerial part increased 18 % with B applications in adequate concentration independent of the B fertilizer sources. In contrast, trees did not grow well with applications of adequate...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Micronutrients; Microparticles; Leaf spraying; Fertilizer use.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000101401

Variabilidade da água disponível de uma terra roxa estruturada latossólica
Provedor de dados: 63
Autores: Moraes,S.O.; Libardi,P.L.
A partir de 250 curvas de retenção da água no solo, elaboradas com amostras indeformadas coletadas de uma área de 6250 m² de uma Terra Roxa Estruturada Latossólica de Piracicaba,SP, foram calculados quatro conjuntos de valores de água disponível assumindo-se -1x10³, -6x10³, -1x10(4) e -3x10(4) Pa como possíveis valores de potencial mátrico correspondentes à capacidade de campo e -1,5x10³ Pa um possível valor correspondente ao ponto de murchamento permanente. Foram feitas medidas de posição (média), variabilidade (coeficiente de variação, assimetria e curtose) e numero necessário de amostras para estimar a média a um dado nível de probabilidade a fim de quantificar a variabilidade e a sensibilidade dos resultados em cada conjunto e entre conjuntos de...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Curva de retenção da água no solo; Variabilidade; Água disponível; Terra roxa estruturada latossólica.
Ano: 1993
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161993000300012

Contribuição da fixação simbiótica de nitrogênio na produção do guandu (Cajanus cajan (L.) Millsp)
Provedor de dados: 63
Autores: Valarini,M.J.; Godoy,R.
Experimento com guandu foi conduzido em casa-de-vegetação utilizando latossolo vermelho-amarelo variação Laras no Instituto de Zootecnia, Nova Odessa, SP, para avaliar parâmetros indiretos de fixação simbiótica de N2. As plantas utilizadas representam acessos de guandu obtidos no CPPSE-EMBRAPA, São Carlos, SP, selecionados para características agronômico-forrageiras. Matéria seca da parte aérea, matéria seca de nódulos, atividade de redução de acetileno, eficiência relativa e teor de nitrogênio total da parte aérea não diferiram significativamente (P &lt; 0,05) entre os acessos de guandu inoculados com Bradyrhizobium spp e com diferentes características agronômicas. A inoculação possibilitou produção de massa verde com teor de nitrogênio (15 - 17% proteína...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fixação de N2; Nodulação; Bradyrhizobium; Cajanus cajan (L.) Millsp.
Ano: 1994
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000300021

Desenvolvimento de mudas de citros cultivadas em vaso em resposta à adubação NPK
Provedor de dados: 63
Autores: Bernardi,Alberto Carlos de Campos; Carmello,Quirino Augusto de Camargo; Carvalho,Sérgio Alves de.
O objetivo deste trabalho foi avaliar o efeito da adubação NPK sobre o desenvolvimento de mudas de laranjeira 'Valência' (Citrus sinensis) sobre o porta-enxerto de limoeiro 'Cravo' (C. limonia) em vasos com substrato de casca de Pinus, vermiculita e perlita. Utilizou-se um esquema de fatorial fracionário (1/5)5³ com um delineamento em blocos ao acaso. Os tratamentos consistiram em 5 doses (em g por planta) de N: 1,25; 6,25; 11,25; 16,25; 21,25; 5 doses de K: 0,42; 3,75; 6,22; 9,34; 12,45; e 5 doses de P: 0,19; 0,89; 1,59; 2,29; 2,99. O N e o K foram fornecidos semanalmente, sendo 37,5% da dose para o porta-enxerto. O P foi fornecido totalmente no plantio. Avaliaram-se a produção de material seco das folhas, raízes, caule, parte aérea e total; área foliar,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Citrus sinensis; Citrus limonia; Propagação; Superfície de resposta; Adubação.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000400022

Performance of Holstein-Zebu cows under partial replacement of corn by coffee hulls
Provedor de dados: 63
Autores: Tavares,Anamaria Almeida Costa; Pereira,Marcos Neves; Tavares,Marcelo Rodrigo; Chaves,Márcio Luiz.
Replacement of corn by citrus pulp or coffee hulls explores the potential of dairy cows to digest fiber-rich feedstuffs. However, for the State of Minas Gerais, Brazil, replacing citrus pulp by coffee hulls may reduce milk production costs, since citrus pulp needs to be imported from another state, while coffee hulls are highly available at essentially no cost. The objective of this experiment was to evaluate the performance of crossbred cows fed concentrates containing 25% coffee hulls (Coffee) or 25% citrus pulp (Pulp) as a replacement for ground corn grain (Corn; 47.4% in the concentrate). Forty-two cows were blocked based on milk yield and allocated to one of the three treatments for 56 days, following a 14-day standardization period. Concentrates were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brazil; Temperament; Citrus pulp; Crossbred cow; Byproduct.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000200001

EFEITO DA OMISSÃO COMBINADA DE N, P, K E S NOS TEORES FOLIARES DE MACRONUTRIENTES EM MUDAS DE GOIABEIRA
Provedor de dados: 63
Autores: Salvador,João Odemir; Moreira,Adônis; Muraoka,Takashi.
O objetivo deste trabalho foi avaliar os efeitos da omissão simples e combinada de dois nutrientes, estabelecida entre os macronutrientes N, P, K e S, sobre a composição de macronutrientes no terceiro par de folhas de mudas de goiabeira. Avaliou-se, ainda, a tendência de acúmulo de macro e micronutrientes (B, Cu, Fe, Mn e Zn) nas folhas, caules + ramos e raízes, de plantas mantidas em solução nutritiva completa durante 70 dias. A ausência de um nutriente promoveu a redução de sua concentração nas folhas, porém, não produziu grandes alterações na composição dos demais macronutrientes, exceto para K e Ca no tratamento com omissão de N. As folhas foram o principal órgão armazenador de macronutrientes. Dos micronutrientes, cerca de 57% do conteúdo de B e 65%...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Goiabeira; Psidium guajava; Composição mineral; Acúmulo de nutrientes; Solução nutritiva.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000200033

Evaluation of Bayesian models for analysis of crude protein requirement for pigs of Brazilian Piau breed
Provedor de dados: 63
Autores: Silva,Hugo Teixeira; Silva,Fabyano Fonseca e; Ferreira,Aloízio Soares; Veroneze,Renata; Lopes,Paulo Sávio.
ABSTRACT: We evaluated the inclusion of information on genetic relationship into the analysis of crude protein requirement in diets for pigs of Brazilian Piau breed, using Bayesian inference. The animals were assigned to treatments in a completely randomized design in factorial scheme 4 × 2 (crude protein levels × sex) with 12 repetitions per treatment. The evaluations were carried out in the initial, growing and finishing phases, and after slaughter. The traits evaluated were feed conversion (FC), backfat thickness (BF), daily weight gain (DWG), daily feed intake (DFI) and some carcass cuts. Three models were considered to evaluate the inclusion of information on genetic relationship into the analysis: Model I, a simple linear model; Model II, the same...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bayesian inference; Genetic relationship; Model selection; Performance.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162019001300208

NÍVEIS DE MAGNÉSIO EM SOLUÇÃO NUTRITIVA E O DESENVOLVIMENTO DO FEIJOEIRO (Phaseolus vulgaris L. cv Carioca): AVALIAÇÃO DE PARÂMETROS BIOMÉTRICOS
Provedor de dados: 63
Autores: BOARO,C.S.F.; RODRIGUES,J.D.; PEDRAS,J.F.; RODRIGUES,S.D.; DELACHIAVE,M.E.; MISCHAN,M. M.
O presente estudo teve como objetivo avaliar a influência dos níveis de magnésio sobre a altura, número de folhas e frutos e área foliar do feijoeiro (Phaseolus vulgaris L. cv Carioca), que constituem seus parâmetros biométricos. Empregou-se a solução nutritiva nº 2 de Hoagland &amp;amp; Arnon, modificada pela variação da concentração desse mineral, que estabeleceu a diferença entre os tratamentos. Em cada vaso, com capacidade para 6 litros, foram cultivadas 3 plantas. O experimento foi inteiramente casualizado, com 3 repetições, em esquema fatorial, com 5 níveis de magnésio e 5 colheitas, realizadas a intervalos de 14 dias. As plantas apresentaram aumento do número de folhas e da área foliar, na 3ª e 4ª colheitas, quando nutridas com 2,4 ppm de magnésio e...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phaseolus vulgaris; Magnésio; Altura; Número de folhas; Número de frutos; Área foliar.
Ano: 1996
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161996000200011

Resistência à seca em quatro cultivares de trigo: parâmetros fisiológicos
Provedor de dados: 63
Autores: Denadai,I.A.M.; Klar,A.E.
A resistência à seca foi estudada em quatro cultivares de trigo, dois de porte baixo: Anahuac e IAC-24 e dois de porte alto, BH-1146 e IAC-23, em dois tratamentos de irrigação: I- vasos constantemente molhados por capilaridade; II- vasos irrigados quando o potencial de água do solo atingisse, aproximadamente, -1,5 MPa. O potencial de água e o teor relativo de água das folhas foram mais elevados no tratamento precondicionado ao estresse, em relação ao irrigado por capilaridade, em todos os cultivares sob as mesmas condições de umidade do solo em ambos os estádios considerados: desenvolvimento vegetativo e reprodutivo. Embora os estômatos das plantas do tratamento submetido ao estresse permanecessem abertos a potenciais de água mais negativos que naqueles em...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Potencial de água; Difusividade das folhas ao vapor d'água; Teor relativo de água das folhas.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000200012

TABELA DE ESPERANÇA DE VIDA PARA ADULTOS DE Bracon sp. (HYMENOPTERA: BRACONIDAE)  PARASITÓIDE DO BICUDO DO ALGODOEIRO
Provedor de dados: 63
Autores: ARAUJO,L.H.A.; ALMEIDA,R.P. de; DIAS,J.M.
A esperança de vida para adultos de Bracon sp foi avaliada em câmara climatizada regulada a temperatura de 26 ± 2°C, UR de 75 ± 5% e fotofase de 12 h. Foi registrada maior esperança de vida (ex) no início da vida, que foi de 7,46 dias. Os resultados evidenciaram que a liberação de Bracon sp. para o controle biológico do bicudo, deve ser a partir da emergência do adulto até o 15o dia, quando a sobrevivência foi máxima.
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Tabela de esperança de vida; Bracon sp.; Bicudo do algodoeiro; Controle biológico; Inseto parasitóide.
Ano: 1997
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161997000200021

24-h variation in soil respiration after a long dry season in a Sudano-Sahelian region
Provedor de dados: 63
Autores: Yemadje,Pierrot Lionel; Guibert,Hervé; Blavet,Didier; Olina,Jean-Paul; Chevallier,Tiphaine; Deleporte,Philippe; Bernoux,Martial.
Soil respiration is a major component of the global carbon cycle which links ecosystems and the atmosphere. To evaluate the reaction of soil respiration after wetting, during a dry period, soil respiration and associated environmental factors were measured over a 24-h period, during the dry season in North Cameroon after wetting the soil. Over 24-h, soil respiration rates followed a quadratic curve during the day coming close to linear at night, while soil temperature and moisture together explained at least 73 % of the variations during the 24-h observed. These soil respiration rates increased during the morning, peaked between 11h00 and 13h00 and then decreased gradually to the minimum around 06h00. These observations were used to propose a method for...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Diel soil respiration; Soil temperature; Soil moisture.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162015000500452

New alternatives for improving and assessing the color of dark–cutting beef – a review
Provedor de dados: 63
Autores: Ribeiro,Caio César de Sousa; Contreras-Castillo,Carmen Josefina; Santos-Donado,Priscila Robertina dos; Venturini,Anna Cecilia.
ABSTRACT Myoglobin (Mb) is a sarcoplasmic heme protein present in muscle cells, which acts as a short–term oxygen (O2) reserve in the muscle tissue. After slaughtering and exsanguination, Mb is the major pigment that provides the red color in meat. The concentration of Mb together with its redox state are two pivotal factors that determine meat color. The elevated pH of dark–cutting beef can affect both physical and biochemical properties resulting in decreased oxygenation. The darkening observed in high ultimate pH (pHu) beef concerns meat processors as color is the initial attribute that impacts on the purchase. Thus, any atypical meat color (i.e., loss of brightness) reduces consumer interest in the product. Several studies have demonstrated that...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: MMb reductase enzyme; High pHu; Ultimate pH; Meat quality; Bull.
Ano: 2022
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162022000101801

Soil health: looking for suitable indicators. What should be considered to assess the effects of use and management on soil health?
Provedor de dados: 63
Autores: Cardoso,Elke Jurandy Bran Nogueira; Vasconcellos,Rafael Leandro Figueiredo; Bini,Daniel; Miyauchi,Marina Yumi Horta; Santos,Cristiane Alcantara dos; Alves,Paulo Roger Lopes; Paula,Alessandra Monteiro de; Nakatani,André Shigueyoshi; Pereira,Jamil de Moraes; Nogueira,Marco Antonio.
Soil Health refers to the ecological equilibrium and the functionality of a soil and its capacity to maintain a well balanced ecosystem with high biodiversity above and below surface, and productivity. To understand and use soil health as a tool for sustainability, physical, chemical, and biological properties must be employed to verify which respond to the soil use and management within a desired timescale. Attributes with a rapid response to natural or anthropogenic actions are considered good indicators of soil health. Among the physical indicators, soil texture, aggregation, moisture, porosity, and bulk density have been used, while among chemical indicators total C and N, mineral nutrients, organic matter, cation exchange capacity, among others are...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Land-use; Microbial community; Soil fauna; Soil quality; Sustainability.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162013000400009

Early defoliation effects on water status, fruit yield and must quality of ‘Nerello mascalese’ grapes
Provedor de dados: 63
Autores: Ferlito,Filippo; Allegra,Maria; Torrisi,Biagio; Pappalardo,Helena; Gentile,Alessandra; Malfa,Stefano La; Continella,Alberto; Stagno,Fiorella; Nicolosi,Elisabetta.
ABSTRACT: The effect of basal zone defoliation on vines influences yield and ripening depending on the phenological stage and its intensity. Early basal defoliation (EBD) was carried out at flowering on the autochthonous Vitis vinifera (L.) cultivar ‘Nerello mascalese’ grown on the eastern slopes of Mount Etna, Sicily. The effects were evaluated over a two-year period. In the first year, the canopy retained 67 % of its original leaf area after EBD and in the second year, 58 %. Compared with control vines, mid-day leaf water potentials in the EBD vines enjoyed higher water status throughout the growing seasons in both years. EBD had no significant negative effects on yield but did have significant positive effects on the levels of total polyphenols, total...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vitis vinifera (L.); Photosynthesis; Canopy; Sustainability; Berry quality.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000600602

Electrical conductivity as an indicator of pea seed aging of stored at different temperatures
Provedor de dados: 63
Autores: Panobianco,Maristela; Vieira,Roberval Daiton; Perecin,Dilermando.
Research on soybean seed has revealed that conductivity test results may be influenced by storage temperature and that an apparent direct relationship between deterioration at low temperatures and loss of cellular membrane integrity is not evident. The objective of this study was to verify the influence of low storage temperatures on electrical conductivity results in other species, such as seeds of two pea cultivars studied temperatures were: 10, 20, 25, 20/10 and 25/10ºC. The physiological potential of the seeds was evaluated every three months during an 18 month storage period using germination, accelerated aging and electrical conductivity tests. The electrical conductivity test was not a good indicator for the degree of seed deterioration stored at...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pisum sativum L.; Vigor; Physiological quality.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000200003

Preferência de Palmistichus elaeisis por pupas de diferentes lepidópteros praga
Provedor de dados: 63
Autores: Bittencourt,Maria Aparecida Leão; Berti Filho,Evoneo.
Palmistichus elaeisis Delvare &amp;amp; LaSalle, 1993 (Hym., Eulophidae), uma espécie de endoparasitóide foi coletado em pupas de Sabulodes sp. (Lep., Geometridae), em área de eucalipto. Foram testadas quatro espécies de lepidópteros-praga: Diatraea saccharalis (Fabricius, 1794) (Crambidae), Anticarsia gemmatalis Hübner, 1818, Heliothis virescens (Fabricius, 1781) e Spodoptera frugiperda (J.E. Smith, 1797) (Noctuidae), com o objetivo de estudar a preferência para oviposição, visando a criação massal do parasitóide. Os resultados mostraram que a porcentagem de parasitismo variou de 90% (H. virescens) a 100%. Em D. saccharalis, o parasitóide P. elaeisis apresentou a maior razão sexual (0,98) e em H. virescens a menor (0,69). A espécie de hospedeiro...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Palmistichus elaeisis; Insecta; Eulophidae; Controle biológico.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000500033

Temperature-related changes in respiration and Q10 coefficient of Guava
Provedor de dados: 63
Autores: Bron,Ilana Urbano; Ribeiro,Rafael Vasconcelos; Cavalini,Flávia Cristina; Jacomino,Angelo Pedro; Trevisan,Marcos José.
Guava (Psidium guajava L.) is a tropical fruit that presents fast post-harvest ripening; therefore it is a very perishable product. Inappropriate storage temperature and retail practices can accelerate fruit quality loss. The objective of this study was to evaluate the respiratory activity (RA), the ethylene production (EP) and Q10 of guava fruit at different storage temperatures. 'Paluma' guava fruits were harvested at maturity stage 1 (dark-green skin) and stored at either 1, 11, 21, 31 or 41ºC; RA and EP were determined after 12, 36, 84 and 156 h of storage. RA and EP rates at 1 and 11ºC were the lowest - 0.16 and 0.43 mmol CO2 kg-1 h-1 and 0.003 and 0.019 µmol C2H4 kg-1 h-1, respectively. When guavas were stored at 21ºC, a gradual increase occurred in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Psidium guajava; Ethylene; Ripening.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000500008

Heterosis expression in crosses between maize populations: ear yield
Provedor de dados: 63
Autores: Silva,Ricardo Machado da; Miranda Filho,José Branco de.
The phenomenon of heterosis has been exploited extensively in maize (Zea mays L.) breeding. The objective of this study was to evaluate the genetic potential of ten maize populations for ear yield following the diallel mating scheme. Six parental populations were obtained through phenotypic selection of open-pollinated ears in Rio Verde, GO, Brazil, (GO populations) and four parental populations were synthesized in Piracicaba, SP, Brazil (GN populations): GO-D (DENTADO), GO- F (FLINT), GO-A (AMARELO), GO-B (BRANCO), GO-L (LONGO), GO-G (GROSSO), GN-01, GN-02, GN-03 and GN-04. Experiments were carried out in three environments: Anhembi (SP) and Rio Verde (GO) in 1998/99 (normal season crop) and Piracicaba (SP) in 1999 (off-season crop). All experiments were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays; Diallel cross; Combining ability.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000300016

Genetic and environmental contributions to increased wheat yield in Minas Gerais, Brazil
Provedor de dados: 63
Autores: Cargnin,Adeliano; Souza,Moacil Alves de; Fronza,Vanoli; Fogaça,Cláudia Martellet.
Producers need wheat cultivars adapted to the predominant climate conditions of the end of the rainy period. Having this in mind, EPAMIG (Agriculture and Livestock Research Institute of Minas Gerais) has been developing a wheat genetic improvement program since 1976, and the estimates of the genetic improvement established by the breeding programs could be useful to quantify their efficiency. This study focused on the quantification of the genetic progress achieved by these improvement programs of dryland wheat in the Brazilian-savanna between 1976 and 2005. The efficiency of these programs was evaluated based on grain yield data of VCU (Value for Cultivation and Use) trials conducted at ten locations in the Minas Gerais State, Brazil. The mean estimated...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Triticum aestivum L.; Genotype evaluation; Breeding program; Genetic gain.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000300006

Tratamento de matrizes de cravo (Dianthus caryophyllus L., Caryophyllaceae) com nitrogênio e calogênese in vitro
Provedor de dados: 63
Autores: Hayashi,Telma Kazumi; Moreira,Adônis; Amaral,Antônio Francisco de Campos; Melo,Murilo.
Indução de calogênese eficiente e multiplicação celular rápida são pré-requisitos fundamentais em biotecnologia de plantas. Sucesso na calogênese é dependente dos componentes do meio de cultura e da qualidade dos explantes. Neste trabalho é relatada a influência do tratamento de matrizes de Dianthus caryophyllus L. com nitrogênio na indução de calogênese in vitro. Mudas de cravo cultivadas em vasos contendo areia foram tratadas com soluções nutritivas contendo 5 níveis de nitrogênio. Explantes folha, entrenós e nó foram coletados aos 30, 45 e 60 dias após início dos tratamentos e inoculados em meio de cultura contendo os sais básicos e vitaminas de Murashige &amp;amp; Skoog (1962), suplementado com 1 g L-1 de caseína hidrolizada, 2 mimol L-1 de cinetina e...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nutrição mineral; Cultura de tecido.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000100006

ASPECTOS DO DESENVOLVIMENTO IMUNOLÓGICO DE LEITÕES RECÉM-NASCIDOS SUBMETIDOS A DIFERENTES DIETAS DE LEITE EM PÓ
Provedor de dados: 63
Autores: ESTEVES,M.C.A.; MACHADO NETO,R.; MYIADA,V.S.
Oitenta e seis leitões provenientes de fêmeas mestiças Landrace x Large White foram distribuídos em quatro tratamentos, empregando-se um delineamento em blocos casualizados (4 blocos/tratamento). Além do tratamento controle, onde se forneceu ração peletizada (T4), dois outros tratamentos (T1 e T2) utilizaram dietas com diferentes níveis de leite em pó incorporado às rações peletizadas (14% e 9,6% na fase pré-inicial e 9,6% e 4,8% na fase inicial). O quarto tratamento (T3) não teve leite em pó incorporado à ração peletizada e sim fornecido diluído a 10% em água, apenas na fase pré-inicial. A dieta pré-inicial foi oferecida no período compreendido entre 21 a 49 dias de vida e a dieta inicial, no período de 49 a 61 dias de idade. As amostragens de sangue para...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Suínos; Imunidade passiva; Leite em pó.
Ano: 1996
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161996000200008

Morphological variation and isozyme diversity in Dioscorea alata L. landraces from Vale do Ribeira, Brazil
Provedor de dados: 63
Autores: Bressan,Eduardo de Andrade; Briner Neto,Thiago; Zucchi,Maria Imaculada; Rabello,Ronaldo José; Veasey,Elizabeth Ann.
Traditional growers of the Vale do Ribeira, São Paulo State, grow and make use of several D. alata landraces. This study assessed the genetic diversity of 16 landraces, using isozymatic and morphological markers and comparing them with 19 commercial varieties of D. alata. Their distribution in different levels of organization such as households and communities of the Vale do Ribeira was evaluated. Isozymatic analyses were performed with polyacrylamide (six systems) and starch gels (one system), while the morphological analyses were carried out with 24 traits. Due to the polyploid nature of this species, the isozymatic bands were scored as binary data. Morphological traits were also scored as binary data. Principal coordinates and cluster analyses were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: AMOVA; Traditional agriculture; Genetic diversity; Water yam.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000400016

Damages of spittlebug on sugarcane quality and fermentation process
Provedor de dados: 63
Autores: Garcia,Débora Branquinho; Ravaneli,Gisele Cristina; Madaleno,Leonardo Lucas; Mutton,Miguel Angelo; Mutton,Márcia Justino Rossini.
The quality of the raw material defines the industrial potential production. The harvest of raw sugarcane promoted a favorable environment for the increase of Mahanarva fimbriolata (Stål, 1854) pest that affects the plant development. This research was undertaken to evaluate the effects of M. fimbriolata on sugarcane quality and fermentation process. For the technological analysis, four damage levels and two evaluation periods were evaluated, while four fermentation cycles and two evaluation periods were tested for microbiological analysis, with three replications. The determined parameters were Brix (soluble solids), Pol (apparent sucrose), Purity, reducing sugars (RS), total reducing sugars (TRS), Total Acidity, pH and Total Phenolic Compounds in juice....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mahanarva fimbriolata infestation; Saccharum spp.; Ethanolic fermentation.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000500009

Distribution of stress in greenhouses frames estimated by aerodynamic coefficients of Brazilian and European standards
Provedor de dados: 63
Autores: Vieira Neto,José Gabriel; Soriano,Julio.
ABSTRACT Widely disseminated in both national and international scenarios, greenhouses are agribusiness solutions which are designed to allow for greater efficiency and control of the cultivation of plants. Bearing this in mind, the construction of greenhouses should take into consideration the incidence of wind, and other such aspects of comfort and safety, and ensure they are factored into the design of structural elements. In this study, we evaluated the effects of pressure coefficients established by the European standard EN 13031-1 (2001) and the Brazilian standard ABNT (1988), which are applicable to the structures of greenhouses with flat roofs, taking into account the following variables: roof slope, external and internal pressure coefficients and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Wind action; Pitched roof; Structural modeling.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000200097

Recovery of degraded areas revegeted with Acacia mangium and Eucalyptus with special reference to organic matter humification
Provedor de dados: 63
Autores: Schiavo,Jolimar Antonio; Busato,Jader Galba; Martins,Marco Antonio; Canellas,Luciano Pasqualoto.
Humidified fractions of organic matter and soil microorganism populations are used as environmental quality indicators. This work aimed to study the changes in chemical and microbiological soil attributes, as well as in the humidified fractions, of the organic matter in a substrate from a clay extraction area cropped with Brachiaria mutica, Acacia mangium and Eucalyptus. In the Eucalyptus area, the P contents increased linearly with planting time. However, only at the twelfth year, differences between Eucalyptus and B. mutica areas have occurred. In the A. mangium area, such differences in the P content occurred at the third year with increment of 43%, at the 0-10 cm layer, in relation to B. mutica. Also, at the 0-10 cm layer, the total carbon contents...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Arborous legumes; Mycorrhizas; Rhizobium; Humic substances; Soil micro biota.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000300010

EFEITO DA RADIAÇÃO GAMA NA SOBREVIVÊNCIA DA LEVEDURA Saccharomyces cerevisiae (cepa M-300-A) EM MOSTO DE MEL DE CANA-DE-AÇÚCAR
Provedor de dados: 63
Autores: ALCARDE,A.R.; WALDER,J.M.M.
No presente trabalho foi estudado o efeito da radiação gama na sobrevivência da levedura Saccharomyces cerevisiae em mosto de melaço de cana-de-açúcar. O melaço a 65o Brix foi diluído a 11o Brix e inoculado com a levedura Saccharomyces cerevisiae (cepa M-300-A). As amostras foram irradiadas com doses de 1,0; 2,0; 3,0; 4,0; 5,0 e 6,0 kGy (Cobalto-60), a uma taxa de 1,703 kGy/h. As amostras foram armazenadas a 4, 18 e 32oC por 7 e 14 dias. A radiação gama se mostrou efetiva em controlar a proliferação da levedura no mosto logo após a sua irradiação, sendo que nas doses de 5,0 e 6,0 kGy não foi observada nenhuma unidade formadora de colônia da levedura. As amostras armazenadas por 7 e 14 dias a 4oC não apresentaram capacidade de proliferação da levedura,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Irradiação; Mosto de mel de cana-de-açúcar; Sobrevivência.
Ano: 1997
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161997000200015

Effect of observed individual data of performance and excretion on life cycle assessment of piglets
Provedor de dados: 63
Autores: Monteiro,Alessandra Nardina Trícia Rigo; Dourmad,Jean-Yves; Fachinello,Marcelise Regina; Diaz-Huepa,Laura Marcela; Sitanaka,Natália Yoko; Partyka,André Vinícius Sturzenegger; Pozza,Paulo Cesar.
ABSTRACT: The objective was to evaluate the impact of producing piglets fed diets with different crude protein (CP) levels through life cycle assessment and experimental data. In Trial I (performance), 28 crossbred barrow piglets, with an initial average weight of 15.3 ± 1.15 kg were divided into a randomized block design with four treatments, seven replications and one animal per experimental unit. In Trial II (nitrogen and phosphorus balance), 20 crossbred barrow piglets with an average weight of 21.4 ± 1.62 kg were divided in a randomized block design with four treatments, five replications and one animal per experimental unit. Four experimental feeds were evaluated: HighCP, CP18, CP17 and LowCP, with 19, 18, 17 and 16 % of CP, meeting the requirements...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Animal variability; Dietary crude protein; Environment; Nitrogen; Weaners.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162019001200102

Alternation of cowpea genotypes affects the biology of Callosobruchus maculatus (fabr.) (Coleoptera: Bruchidae)
Provedor de dados: 63
Autores: Lima,Marcileyne Pessôa Leite de; Oliveira,José Vargas de; Barros,Reginaldo; Torres,Jorge Braz.
Callosobruchus maculatus (Fabr.) is an important pest in stored cowpea, Vigna unguiculata (L.) Walp., with ample distribution in tropical and subtropical regions. The effect of alternation of cowpea genotypes, susceptible (S) and resistant (R), on the biology of (C. maculatus) was studied after four generations. A no-choice test was carried out in a completely randomized design, factorial scheme, with five treatments, four host combinations (RR, RS, SR and SS) and five replications. Each replication consisted of 30 grains of each genotype infested by two insect couples. The number of eggs per female was not different within or between combinations, evidencing that the genotypes and their alternation did not affect C. maculatus fecundity. Egg viability,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Insecta; Plant resistance; Antibiosis; Stored cowpea pest.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000100005

Grain yield, efficiency and the allocation of foliar N applied to soybean canopies
Provedor de dados: 63
Autores: Oliveira,Silas Maciel de; Pierozan Junior,Clovis; Lago,Bruno Cocco; Almeida,Rodrigo Estevam Munhoz de; Trivelin,Paulo Cesar Ocheuze; Favarin,José Laércio.
ABSTRACT: Soybean [Glycine max (L.) Merr.] grain yield is closely associated with the level of optimal nitrogen (N) supply, especially during the reproductive stages. Foliar fertilization with low rates of N have been considered as a strategy for furnishing additional N and enhancing grain yields. Field studies using 15N tracer were conducted over two growing seasons to investigate the impact of foliar N fertilization on grain yield, plant N content, the amount of N derived from fertilizer (NDFF) and N recovery efficiency (NRE). Four foliar N rates (0, 1300, 2600 and 3900 g ha−1) were supplied by two equal split applications at the R1 and R3 stages. Foliar N fertilization of soybean canopies did not affect grain yield, grain N content, shoot N content nor...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycine max (L.) Merr; Foliar N fertilization; 15N tracer; Foliar application; Nitrogen recovery efficiency.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162019001400305

Start-up adjustment of a plug-flow digester for cassava wastewater (manipueira) treatment
Provedor de dados: 63
Autores: Ribas,Maria Magdalena Ferreira; Barana,Ana Cláudia.
Manipueira, wastewater of cassava (Manihot esculenta) processing, can be treated by anaerobic biodigestion. To study the start-up process of a plug-flow digester for manipueira treatment, this work consisted of two stages: gradual decrease of the hydraulic retention time (HRT) to the preset time of 4 days or maintaining a fixed HRT of 4 days with gradual increase of the substrate concentration. A digester of 1980 mL capacity was opperated, at constant temperature (32 ± 1º C), with substrate pH corrected between 5.5 and 6.0. The first stage had durations of 16.6; 13.6; 11.6; and 9.6 days and the organic loads were 3.1; 2.0; 2.3; and 2.9 COD L-1 d-1, (chemical oxigen demand) respectively. The second stage was characterized by a fixed HRT (4 days) and organic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cassava; Anaerobic; Effluent; Biodigestion.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000200004

Short-term assessment of bt maize on non-target arthropods in Brazil
Provedor de dados: 63
Autores: Fernandes,Odair Aparecido; Faria,Marcos; Martinelli,Samuel; Schmidt,Francisco; Carvalho,Vinícius Ferreira; Moro,Gloverson.
Although not yet available for cultivation in Brazil, the effect of Bt maize hybrids on natural enemies and soil dwelling arthropods should be assessed prior to its release to growers. Trials were carried out during one growing season in two different locations with the genetically modified maize hybrids 7590-Bt11 and Avant-ICP4, comparing with their respective non-Bt isogenic hybrids. Arthropods were evaluated through direct observation on plants and pitfall traps. In general, no differences were observed between populations of earwig (Dermaptera: Forficulidae), lady beetles (Coleptera: Coccinellidae), minute pirate bug (Coleoptera: Anthocoridae), ground beetles (Carabidae), tiger beetles (Cicindelidae), and spiders (Araneae). There was no difference in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Spodoptera frugiperda; Helicoverpa zea; Genetically modified crop; Maize pests; Soil dwelling arthropods.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000300006

CONSERVAÇÃO E GERMINAÇÃO DE SEMENTES E DESENVOLVIMENTO DE PLÂNTULAS DA PEREIRA PORTA-ENXERTO TAIWAN NASHI-C
Provedor de dados: 63
Autores: BARBOSA,W.; DALL'ORTO,F.A.C.; OJIMA,M.; NOVO,M.C.S.S.; BETTI,J.A.; MARTINS,F.P.
Pesquisaram-se, por trinta meses, a conservação e a germinação de sementes, a emergência e o desenvolvimento de plântulas da pereira porta-enxerto Taiwan Nashi-C (Pyrus calleryana Decaisne). Sementes com 12% de umidade armazenadas sob ambiente frio (5-10oC), em frascos de vidro com tampa plástica, mostraram alto poder de conservação. Germinações de 100% ocorreram até o 9o mês, diminuindo para 97, 94, 83 e 76% no final do 12o, 18o, 24o e 30o mês de armazenamento, com uma emergência, em condições de ripado, de 88, 89, 81, 76 e 70% respectivamente. Posteriormente ao 12o mês de armazenamento das sementes, a germinação que ocorria próximo aos 35 dias de estratificação, passou a necessitar mais de 50 dias para emissão da radícula. As plântulas, com rápido e...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pêra; Porta-enxerto oriental; Longevidade das sementes; Armazenagem a frio.
Ano: 1997
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161997000200006

Espectrofotometria de zinco em fertilizantes em fluxo
Provedor de dados: 63
Autores: Rodella,Arnaldo Antonio; Baccan,Nivaldo; Zagatto,Elias Aires Guidetti.
Um sistema de análise química por injeção em fluxo é proposto para a determinação espectrofotométrica de zinco em amostras de misturas de fertilizantes minerais, empregando-se zincon como reagente cromogênico. O procedimento analítico envolve redução de íons metálicos por ácido ascórbico, complexação com íon cianeto, seguindo-se a descomplexação seletiva do zinco com formaldeído, liberando-o para que reaja com o zincon formando um complexo azul. A aplicação do método proposto à extratos de mistura de fertilizantes indicou que a ação de interferentes pode ser contornada e que resultados comparáveis aos da espectrometria de absorção atômica são obtidos.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Espectrofotometria; Zinco; Fertilizante; Injeção em fluxo.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000300013

Growth and osmoregulation in Salmo salar L. juveniles 1+, 1½ + and 2+ reared under restrained salinity
Provedor de dados: 63
Autores: Gonçalves,José Fernando Magalhães; Carraça,Stela; Damasceno-Oliveira,Alfredo; Vicente,Córalia; Costa,Paulo Martins da; Lopes-Lima,Manuel; Ozório,Rodrigo Otávio de Almeida.
The freshwater phase of Atlantic salmon Salmo salar L vary between one and eight years. The reduction of the freshwater phase is desirable to reduce freshwater usage, human resources and to increase year round availability of pan-sized salmon. Three trials were conducted to investigate the possibility of supply the market in a year-round basis, with pan-sized Atlantic salmon Salmo salar L. (250-300 g) in Portugal (southern limit of the natural distribution of this species). This study primarily aimed to compare the osmoregulatory ability and growth of different fish sizes, smolts 1+ (trial 1), 1.5+ (trial 2) and 2+ (trial 3), in freshwater and seawater conditions. Additionally, effects of photoperiod were determined in smolts 1.5+ (trial 2) for both...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Atlantic salmon; Post-smolts development; Smoltification; Seawater transfer.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162013000100003

In-row spacing and shoot thinning for ‘Chardonnay’ grapevines in the south of Minas Gerais, Brazil
Provedor de dados: 63
Autores: Almeida,Luciana Wilhelm de; Mota,Renata Vieira da; Souza,Cláudia Rita de; Silva,Letícia Pereira; Fernandes,Fernanda de Paula; Mendonça,Tânia dos Reis; Peregrino,Isabela; Regina,Murillo de Albuquerque.
ABSTRACT: The quality of sparkling wine reflects the climate and management of vineyard, since these factors affect grape development, berry composition, and base wine composition. ‘Chardonnay’ vines were subjected to five in-row spacing distances (0.5; 0.75; 1.0; 1.50; and 2.0 m) combined with and without shoot thinning. For each in-row spacing, vines were thinned to 5, 8, 10, 15, and 20 shoots per plant. Vegetative growth, yield, berry composition and base wine composition were analyzed for two years. Vines with decreased in-row spacing, presented fewer clusters and malic acid content in berries, mostly related to the shading effect. Shoot thinning increased bud fruitfulness and decreased leaf area per meter, leaf area per plant, and leaf layer number....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vitis vinifera; Vine spacing; Canopy management; Grape quality; Sparkling wine.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000600601

Sulfur modulates yield and storage proteins in soybean grains
Provedor de dados: 63
Autores: Ibañez,Thiago Bergamini; Santos,Luiz Felipe de Melo; Lapaz,Allan de Marcos; Ribeiro,Igor Virgilio; Ribeiro,Filipe Virgilio; Reis,André Rodrigues dos; Moreira,Adônis; Heinrichs,Reges.
ABSTRACT This study evaluated the nutritional quality, yield, and storage protein modulation in soybean grains in response to levels and sources of sulfur (S) in a dystrophic Ultisol. We used five levels of S (0, 50, 100, 150 and 200 mg kg –1 ) and four sources of S (elemental S pastille - ESPA, gypsum - GY, gypsite - GI and elemental S powder - ESPO). Plants treated with 50 mg kg –1 of GY, GI, and ESPO and 200 mg kg –1 of ESPA had the largest grain yield values. Low S supply resulted in lower yields for all S sources tested. Sulfur deficiencies were observed at all levels for ESPA, resulting in lower concentrations of globulin and higher concentration of glutelin and albumin in the grains, possibly because the S content in the leaf was below the range...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycine max; Plant nutrition; Elemental sulfur; Sulfate.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000101402

Growth, development, and fertilizer-15N recovery by the coffee plant
Provedor de dados: 63
Autores: Fenilli,Tatiele Anete Bergamo; Reichardt,Klaus; Dourado-Neto,Durval; Trivelin,Paulo César Ocheuze; Favarin,José Laercio; Costa,Flávio Murilo Pereira da; Bacchi,Osny Oliveira Santos.
The relationship between growth and fertilizer nitrogen recovery by perenial crops such as coffee is poorly understood and improved understanding of such relations is important for the establishment of rational crop management practices. In order to characterize the growth of a typical coffee crop in Brazil and quantify the recovery of 15N labeled ammonium sulfate, and improve information for fertilizer management practices this study presents results for two consecutive cropping years, fertilized with 280 and 350 kg ha-1 of N, respectively, applied in four splittings, using five replicates. Shoot dry matter accumulation was evaluated every 60 days, separating plants into branches, leaves and fruits. Labeled sub-plots were used to evaluate N-total and 15N...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coffea arabica L.; Stable isotope; Nitrogen; Dry matter accumulation; 15N.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000500012

Fluorescence characteristics and photoinhibition in saplings of manwood on clear days and under overcast conditions
Provedor de dados: 63
Autores: Dias,Daniela Pereira; Marenco,Ricardo Antonio.
High irradiance may reduce the productivity of tropical plants by exacerbating photoinhibition of photosynthesis, particularly in the case of shade-adapted plants. The aim of this study was to determine the effect of cloud cover on the fluorescence characteristics and photoinhibition on saplings of manwood (Minquartia guianensis Aubl.). Three-year-old saplings were exposed to full irradiance either on clear days (10, 45 and 90 min) or under overcast conditions (120, 180, and 420 min). Changes in the population of functional photosystem II (PSII), the initial (Fo) and maximum fluorescences (Fm), and the Fv/Fm ratio (maximum potential quantum yield of PSII) were monitored after plant exposure to full irradiance and during recovery (within 48 h) at low light...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amazonia; Functional photosystem II; Initial fluorescence; Light quality; Photon fluence.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000600006

Survey of mycotoxins in Southern Brazilian wheat and evaluation of immunoassay methods
Provedor de dados: 63
Autores: Duffeck,Maíra Rodrigues; Tibola,Casiane Salete; Guarienti,Eliana Maria; Del Ponte,Emerson Medeiros.
ABSTRACT One hundred commercial wheat grain samples were collected during the 2015 sea-son across 78 municipalities in the states of Paraná (PR), Rio Grande do Sul (RS), and São Paulo (SP), Brazil. Separate subsamples were analyzed for the concentration of deoxynivalenol (DON), zearalenona (ZEA) and ochratoxin A (OTA) mycotoxins using two methods: UHPLC-MS/MS (reference method) and a commercial enzyme-linked immunosorbent assay (ELISA) (AgraQuant®). The OTA mycotoxin was not found in the samples by both methods. DON and ZEA were detected in 55 % and 39 % of the samples by the reference method, with overall mean levels of 795.2 μg kg−1 and 79.78 μg kg−1, respectively. There was a significant and positive correlation (Spearman rank) between DON and ZEA...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Triticum aestivum; UHPLC; ELISA; Trichothecenes; Ochratoxin.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162017000400343

Interações entre auxinas e ácido bórico, no enraizamento de estacas caulinares de Coffea arabica L. cv. Mundo Novo
Provedor de dados: 63
Autores: Ono,E.O.; Rodrigues,J.D.; Pinho,S.Z. do.
O presente trabalho teve como finalidade, estudar o efeito de auxinas e do boro no enraizamento de estacas caulinares de Coffea arabica L. cv. "Mundo Novo". As estacas foram retiradas de ramos ortotrópicos semi-lenhosos de cafeeiro, as quais foram tratadas durante 24 horas com soluções de IBA ou NAA e boro, e a mistura das três substâncias, resultando um total de 14 tratamentos. Para a avaliação do objetivo em questão, foram realizadas as seguintes observações, mediante coleta após 90 dias de plantio: número de estacas enraizadas e número de estacas com calos. Através dos resultados obtidos, pode-se concluir que, para obter um maior número de estacas enraizadas, é conveniente o tratamento com NAA à 100 ou 200 ppm mais boro.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cafeeiro; Estacas; Enraizamento; Boro; IBA; NAA.
Ano: 1992
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161992000400005

Least limiting water range and physical quality of soil under groundcover management systems in citrus
Provedor de dados: 63
Autores: Fidalski,Jonez; Tormena,Cássio Antonio; Silva,Álvaro Pires da.
Machinery-based farming operations used for perennial fruit crops often damage soils, particularly if the soil is wet and prone to compaction. We hypothesized that perennial vegetation growing in the interrows of orange orchards can mitigate the soil physical degradation from machinery traffic. The objective of this study was to investigate the effects of different groundcover management systems on the soil physical quality indicators including the least limiting water range (LLWR). An experiment was started in 1993 in a Typic Paleudult to evaluate three groundcover management systems: Bahia grass (Paspalum notatum) with mowing, perennial peanut (Arachis pintoi), and natural regrowth in which weeds were controlled by herbicide. The experimental design was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Organic carbon; Soil compaction; Bulk density; Resistance to penetration; Available water.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000400012

The use of Pedotransfer functions and the estimation of carbon stock in the Central Amazon region
Provedor de dados: 63
Autores: Gomes,Andréa da Silva; Ferreira,Ana Carolina de Souza; Pinheiro,Érika Flávia Machado; Menezes,Michele Duarte de; Ceddia,Marcos Bacis.
ABSTRACT Computer models have been used to assess soil organic carbon (SOC) stock change. Commonly, models require to determine soil bulk density (Db), a variable that is often lacking in soil data bases. To partly overcome this problem, pedotransfer functions (PTFs) are developed to estimate Db from other easily available soil properties. However, only a few studies have determined the accuracy of these functions and quantified their effects on the final quality of the spatial variability maps. In this context, the objectives of this study were: i) to develop one PTF to estimate Db in soils of the Brazilian Central Amazon region; ii) to compare the performance of PTFs generated with three other models generally used to estimate Db in soils of the Amazon...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Içá Formation; Multiple linear regression; Ordinary kriging.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162017000600450

Mycorrhizal effectiveness and manganese toxicity in soybean as affected by soil type and endophyte
Provedor de dados: 63
Autores: Nogueira,Marco Antonio; Cardoso,Elke Jurandy Bran Nogueira.
Mycorrhizal plants may present Mn toxicity alleviation and this depends on the plant-endophyte-environment interaction. The effectiveness of three arbuscular mycorrhizal fungi (AMF) (Glomus macrocarpum, G. etunicatum, G. intraradices) and a control without AMF in two soils: Typic Rhodudalf with high Mn availability and a Typic Quartzipsamment, with low Mn availability, was evaluated in a time-course experiment at 3, 6, 9 and 12 weeks after soybean (Glycine max L.) seedling emergence. The objective was to select the most effective AMF species to enhance plant growth and to assess its effects upon Mn uptake by plants and Mn availability in the soil. For the sandy soil, AMF inoculation resulted in increased plant biomass, especially with G. intraradices and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mn; Availability; Metal; Mycorrhiza; Toxicity; Uptake.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000200018

Impact of Bt sweet corn on lepidopteran pests in Midwestern Brazil
Provedor de dados: 63
Autores: Schneider,Altair Marcos; Gontijo,Lessando Moreira; Costa,Lilian Lucia.
ABSTRACT: While the cultivation of conventional Bt corn has been widely adopted in Brazil, the production of Bt sweet corn is still incipient. The main lepidopteran pests found attacking conventional and sweet corn in Brazil are Spodoptera frugiperda (J.E. Smith) and Helicoverpa zea (Boddie). Additionally, a new harmful Lepidoptera species has recently appeared in Brazil, Helicoverpa armigera (Hübner). Since Bt sweet corn in Brazil is as yet cultivated on a limited scale there is no scientific information available about the performance of Bt sweet corn against lepidopterans out in the field. Thus, we conducted two field experiments to evaluate the efficacy of Bt sweet corn (event MON89034), alone and in conjunction with insecticides, against major...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Spodoptera frugiperda; Helicoverpa; Transgenic; Insecticide.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162019001300214

Natural infection of several Coffea species and hybrids and Psilanthus ebracteolatus by the coffee ringspot virus (CoRSV)
Provedor de dados: 63
Autores: Kitajima,Elliot Watanabe; Chagas,César Martins; Braghini,Masako Toma; Fazuoli,Luiz Carlos; Locali-Fabris,Eliane Cristina; Salaroli,Renato Barbosa.
Coffee ringspot is a minor coffee disease caused by the nuclear type of Brevipalpus mite-transmitted virus, Coffee ringspot virus (CoRSV). Recently outbreaks of the disease in some growing regions of the state of Minas Gerais, Brazil, were registered with qualitative and quantitative yield losses. Coffea arabica was the only species registered as natural host. A survey was made on a germplasm collection of Coffea and related species kept at the Centro de Café "Alcides Carvalho", Instituto Agronômico, Campinas, state of São Paulo (SP), Brazil, to assess natural susceptibility of Coffee species, other than C. arabica and some interspecific hybrids of Coffea as well as other non-Coffea plant species to the Coffee ringspot virus (CoRSV). The following plants...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coffea arabica; C. kapakata; C. racemosa; C. dewevrei; Híbrido de Timor.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000400017

Mathematical models in ruminant nutrition
Provedor de dados: 63
Autores: Tedeschi,Luís Orlindo; Fox,Danny Gene; Sainz,Roberto Daniel; Barioni,Luís Gustavo; Medeiros,Sérgio Raposo de; Boin,Celso.
Mathematical models can be used to improve performance, reduce cost of production, and reduce nutrient excretion by accounting for more of the variation in predicting requirements and feed utilization in each unique production situation. Mathematical models can be classified into five or more categories based on their nature and behavior. Determining the appropriate level of aggregation of equations is a major problem in formulating models. The most critical step is to describe the purpose of the model and then to determine the appropriate mix of empirical and mechanistic representations of physiological functions, given development and evaluation dataset availability, inputs typically available and the benefits versus the risks of use associated with...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cattle; Feeding; Nutrient; Requirement; Supply.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000100015

Effect of previous soil management on sugarcane response to nitrogen fertilization
Provedor de dados: 63
Autores: Otto,Rafael; Mariano,Eduardo; Mulvaney,Richard Lesley; Khan,Saeed Ahmad; Boschiero,Beatriz Nastaro; Tenelli,Sarah; Trivelin,Paulo Cezar Ocheuze.
ABSTRACT: N Fertilizer recommendations must be improved to optimize N use efficiency (NUE) for bioenergy crops. A study was conducted to test the hypothesis that sites varying in historical usage of by-product differ in soil N-supplying power and sugarcane (Saccharum spp.) responsiveness to N fertilization. Our aim was to quantify soil N availability and N fertilizer rates, sources, and application timings for their effects on sugarcane yield and NUE. Three N response trials, each involving 0 to 200 kg N ha−1, were conducted in the state of São Paulo, Brazil, at sites varying historically in the usage of vinasse. Before fertilizer application and at harvest, soil inorganic N content was quantified and potential N mineralization estimated by the Illinois...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Saccharum spp.; Illinois Soil N Test; Inorganic N; Vinasse; Mineralization.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162019000100072

Screening a bacterium and its effect on the biological degumming of ramie and kenaf
Provedor de dados: 63
Autores: Cheng,Lifeng; Wang,Qiming; Feng,Xiangyuan; Duan,Shengwen; Yang,Qi; Zheng,Ke; Liu,Zhiyuan; Liu,Zhengchu; Peng,Yuande.
ABSTRACT: Biological degumming is an eco-friendly, efficient, high-quality and low-cost method that has become the leading bast fiber degumming technology. However, bacterial strains with short degumming cycles, high gum removal rates and small fiber damage are few. To screen high quality microbial resources with bast-fiber biological degumming function, soil samples were collected from a continuously cultivated banana plantation and then used to be enriched by ramie and kenaf materials in turn. A selective pectin-degrading medium was used to screen for excellent bacteria. A dominant bacterial strain was identified by phenotypic and genotypic characteristics, and its biological degumming effects on ramie and kenaf were verified by a comprehensive...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bacillus cereus; Pectinase; Bast fiber; Bio-degumming.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162018000500375

Comparison of beat cloth and entomological net methods for determining faunistic indices of soybean in Rio Grande do Sul, Brazil
Provedor de dados: 63
Autores: Storck,Lindolfo; Antúnez,Claudia Carolina Cabral; Guedes,Jerson Vanderlei Carús; Cargnelutti Filho,Alberto; Alvarez,Jimmy Walter Rasche.
ABSTRACT Estimates of diversity indices provide information on distribution, richness and abundance of species within a community. The aim of the current study was to estimate faunistic indices (richness, constancy, dominance and abundance) of the species collected by beat cloth and entomological net sampling methods in different soybean crops and to determine the sample size necessary to estimate faunistic indices. Fauna density from 100 soybeans crops located in nine municipalities in Rio Grande do Sul, Brazil, were evaluated. Thirty points, 20 meters apart from one another, were marked in the crops. At each point, insect pests and natural enemies were collected using the two sampling methods. Faunistic indices, including the average and interval...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycine max; Resampling; Sample size; Natural enemies; Sampling methods.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000600559

Use of vegetable species for B and heavy metal's soil decontamination
Provedor de dados: 63
Autores: Coscione,Aline Renee.
Tipo: Info:eu-repo/semantics/article
Ano: 2023
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010010400002

Performance of 'Okitsu' Satsuma Mandarin on nine rootstocks
Provedor de dados: 63
Autores: Tazima,Zuleide Hissano; Neves,Carmen Silvia Vieira Janeiro; Yada,Inês Fumiko Ubukata; Leite Júnior,Rui Pereira.
Mandarins have become increasingly valued as citrus fruits for the fresh market due to the easy peeling, attractive flavor, and health and nutritional properties. Plant growth and yield, and characteristics of fruits of 'Okitsu' Satsuma mandarin (Citrus unshiu Marc.) trees grafted on nine rootstocks were evaluated in Londrina, northern Paraná, Brazil. The rootstocks were: 'Rangpur' lime (Citrus limonia Osb.); 'Cleopatra' (Citrus reshni hort. ex Tanaka) and 'Sunki' mandarins (Citrus sunki hort. ex Tanaka); 'C-13' [Citrus sinensis × Poncirus trifoliata (L.) Raf.] and 'Carrizo' citranges [C. sinensis × P. trifoliata (L.) Raf.]; 'Volkamer' lemon (Citrus volkameriana V. Ten. &amp;amp; Pasq.); trifoliate orange [P. trifoliata (L.) Raf.; 'Caipira DAC' sweet...
Tipo: Info:eu-repo/semantics/article
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162013000600007

Residual biomass potential of commercial and pre-commercial sugarcane cultivars
Provedor de dados: 63
Autores: Landell,Marcos Guimarães de Andrade; Scarpari,Maximiliano Salles; Xavier,Mauro Alexandre; Anjos,Ivan Antônio dos; Baptista,Antônio Sampaio; Aguiar,Cláudio Lima de; Silva,Daniel Nunes da; Bidóia,Márcio Aurélio Pitta; Brancalião,Sandro Roberto; Bressiani,José Antônio; Campos,Marcelo Ferraz de; Miguel,Paulo Eduardo Martins; Silva,Thiago Nogueira da; Silva,Victor Hugo Pavelqueires da; Anjos,Luciana Oliveira Souza; Ogata,Bruna Harumi.
Sugarcane (Saccharum spp.) is an efficient and sustainable alternative for energy generation compared to non-renewable sources. Currently, during the mechanized harvest process, the straw left in the field can be used in part for the second generation ethanol and increasing the electric energy production. Thus, this study aimed to provide information on the potential for residual biomass cultivars of sugarcane cropping system. This study provides the following information: yield of straw, depending on the calculated leaf area index and the number of tillers per linear meter; primary energy production of several sugarcane genotypes; contribution of dry tops and leaves; biomass yield; and evaluation of fiber, cellulose, hemicellulose and lignin. Preliminary...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Straw; Genotypes; Composition.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162013000500003

Pb-phytoextraction by maize in a Pb-EDTA treated Oxisol
Provedor de dados: 63
Autores: Pereira,Bruno Fernando Faria; Abreu,Cleide Aparecida de; Romeiro,Solange; Lagôa,Ana Maria Magalhães Andrade; Paz-González,Antônio.
One of the most viable strategies to restore metal contaminated soils is the introduction of plants specialized in their accumulation or able to tolerate very high metal concentrations. This research evaluated: i. the maize as a Pb-accumulator plant; ii. the effects of EDTA-chelating agent for Pb-uptake by maize; iii. amending effect of EDTA on the soil Pb-availability using different extracts. Treatments consisted of Pb rates (100; 200; 350; 1,200 and 2,400 mg kg-1) applied to a Rhodic Hapludox in the form of Pb3(NO)2 with (0.5 g kg-1) and without EDTA. Lead concentrations were determined in maize plant shoots. Soil available Pb was obtained using DTPA, Mehlich-3 and saturation solutions methods. Ionic speciation in the soil solution was performed using...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mehlich-3; DTPA; Phytoremediation; Available Pb; Ionic speciation.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000100008

Honey bee contribution to canola pollination in Southern Brazil
Provedor de dados: 63
Autores: Rosa,Annelise de Souza; Blochtein,Betina; Lima,Diego Kweco.
Although canola, (Brassica napus L.), is considered a self-pollinating crop, researchers have indicated that crop productivity increases as a result of honey bee Apis mellifera L. pollination. Given this crop's growing importance in Rio Grande do Sul State, Brazil, this work evaluated the increase in pod and seed productivity with respect to interactions with anthophilous insects and manual pollination tests. The visiting frequency of A. mellifera was correlated with the crop's blooming progression, and productivity comparisons were made between plants visited by insects, manually pollinated plants (geitonogamy and xenogamy) and plants without pollination induction. Pod set and seed production per plant were determined for each treatment. Among the 8,624...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Flower-visiting insects; Blooming; Canola productivity.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000200018

A statistical approach to static and dynamic tests for Global Navigation Satellite Systems receivers used in agricultural operations
Provedor de dados: 63
Autores: Maldaner,Leonardo Felipe; Canata,Tatiana Fernanda; Dias,Carlos Tadeu dos Santos; Molin,José Paulo.
ABSTRACT: The adaptation of the Global Navigation Satellite Systems (GNSS) technology to fit the needs of farmers requires knowledge of the accuracy level delivered by a GNSS receiver in working conditions. To date, no methodology indicates the minimum number of replications to perform a statistical comparison. This study aims to advance knowledge on the methodological approach for evaluating the static and dynamic performance of GNSS receivers commonly used in agricultural operations. For the static test, a supporting frame in the ground carried all the receivers with coordinates properly transported. In the dynamic test, a circular rail with a 9.55 m radius was installed at ground level with a platform driven by an electric motor to carry the receivers...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: RTK; SBAS; Accuracy; Differential correction.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000500101

Potential and existing mechanisms of enteric methane production in ruminants
Provedor de dados: 63
Autores: Qiao,Junyi; Tan,Zhiliang; Wang,Min.
Enteric methane (CH4) emissions in ruminants have attracted considerable attention due to their impact on greenhouse gases and the contribution of agricultural practices to global warming. Over the last two decades, a number of approaches have been adopted to mitigate CH4 emissions. However, the mechanisms of methanogenesis have still not been fully defined. According to the genome sequences of M. ruminantium in the rumen and of M. AbM4 in the abomasum, the pathways of carbon dioxide (CO2) reduction and formate oxidation to CH4 have now been authenticated in ruminants. Furthermore, in the light of species or genera description of methanogens, the precursors of methanogenesis discovered in the rumen and research advances in related subjects, pathways of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Methanogenesis; Carbon dioxide; Formate; Acetate; Methanol.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162014000500013

Closely-related Xanthomonas citri subsp. citri isolates trigger distinct histological and transcriptional responses in Citrus limon
Provedor de dados: 63
Autores: Orce,Ingrid Georgina; Debes,Mario; Sendín,Lorena; Luque,Ana; Arias,Marta; Vojnov,Adrián; Marano,María; Castagnaro,Atilio; Filippone,María Paula.
ABSTRACT Citrus canker, caused by Xanthomonas citri subsp. citri (Xcc), has an important economic impact on the citrus industry. Extensive information is available about the disease but, nevertheless, the study of plant-pathogen interactions could provide new information in the understanding of citrus canker disease. A new isolate has been identified, Xcc AT, which has a high genetic similarity (&gt; 90 %) to the virulent Xcc T strain based on genetic clustering analyses of the rep-PCR fingerprinting patterns, but it does not produce cankerous lesions in Citrus limon. In this study, we compared C. limon responses to Xcc AT and to the virulent Xcc T strain at both histological and transcriptional levels. Histologically, leaves inoculated with Xcc AT...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: CDNA-AFLP; Gene expression; Canker; Plant defense; Microscopy.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000600552

Ocorrência de fungos em sementes de soja produzidas sob calagem e adubação potássica residuais
Provedor de dados: 63
Autores: Mascarenhas,H.A.A.; Patrício,F.R.A.; Tanaka,M.A.S.; Tanaka,R.T.; Pianoski,J.
Estudou-se o efeito residual da adubação potássica e da calagem sobre a ocorrência de fungos em sementes de soja. O experimento foi instalado com a cultivar IAC-17, no ano agrícola de 1991/92, aplicando doses a lanço de O, 3,5 e 7 t/ha de calcário dolomítico e de 0, 150, 300, 450 e 600 kg/ha de K2O. As sementes colhidas no terceiro ano de cultivo, (1993/94) foram submetidas ao teste de sanidade, pelo método do papel de filtro. Observou-se que a calagem reduziu significativamente a incidência de Phomopsis sp., favorecendo, no entanto, a presença de Aspergillus sp. e de Fusarium sp.. Embora não tenham sido detectadas diferenças significativas, nos tratamentos com calagem, verificou-se redução da incidência de Cercospora kikuchii, Colltotrichum dematium var....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Patologia de semente; Doença; Fungos; Soja; Glycine max; Calagem; Adubação potássica.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000300004

State-space analysis of soil data: an approach based on space-varying regression models
Provedor de dados: 63
Autores: Timm,Luís Carlos; Barbosa,Emanuel Pimentel; Souza,Manoel Dornelas de; Dynia,José Flávio; Reichardt,Klaus.
The assessment of the relationship among soil properties (such as total nitrogen and organic carbon) taken along lines called transects is a subject of great interest in agricultural experimentation. This question has been usually approached through standard state-space methods by some authors in the soil science literature. Important limitations of the mentioned procedures used in practice are pointed out and discussed in this paper, specially those related to the model parameters, meaning and practical interpretation. In the standard state-space approach, based on an autoregressive structure, it does not present any parameters that express the variables relationship at the same point in space, but only at lagged points. Also, its model parameters (in the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dynamic regression; Soil properties; Spatial heterogeneity; Kalman filter.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000200023

SECAGEM INTERMITENTE E SEUS EFEITOS NA QUALIDADE FISIOLÓGICA DE SEMENTES DE TREMOÇO AZUL
Provedor de dados: 63
Autores: AHRENS,D.C.; VILLELA,F.A.
Dois modelos de secadores comerciais, um intermitente lento, com a temperatura do ar de secagem a 60oC e a 65oC e outro rápido a 50oC, foram testados para a avaliação da redução do grau de umidade de 20 para 13% e sua influência na qualidade fisiológica das sementes de tremoço azul (Lupinus angustifolius L.). Foram realizados testes de germinação, envelhecimento artificial e emergência em campo, após a secagem, aos três e seis meses de armazenamento. Os testes de germinação e envelhecimento artificial não detectaram diferenças significativas entre a qualidade das sementes secadas nos secadores e das secadas à sombra. Na semeadura aos seis meses, as emergências em campo foram 81%, 89%, 90% e 83% para os secadores intermitente lento a 60oC, a 65oC, para o...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Secagem; Qualidade; Tremoço azul; Lupinus angustifolius L.; Sementes.
Ano: 1996
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161996000200020

Seqüência Latossolo Amarelo - Podzólico Amarelo - Areias Quartzosas sob material da formação barreiras na região de Tucuruí, estado do Pará
Provedor de dados: 63
Autores: Demattê,J.A.M.; Aloisi,R.R.; Demattê,J.L.I.
Estudou-se uma seqüência de Latossolo Amarelo-Podzólico Amarelo-Areia Quartzosa desenvolvida em sedimentos da Formação Barreiras. A área se localiza no sul do Pará, nas proximidades entre Tucuruí e o Rio Moju, distando 65km da Usina Hidroelétrica de Tucuruí. Foi escolhida uma encosta de aproximadamente 1500 metros formada por Latossolo na parte alta e Podzólico Amarelo na encosta, ambos argilosos, terminando em amplo vale de fundo arenoso, com forte hidromorfísmo. Os regimes de temperatura são isohipertérmico e hipertérmico e os de umidade ústico e áquico, nas partes elevadas e fundo do vale, respectivamente. Foram abertas quatro trincheiras ao longo da encosta e feitas oito tradagens para apoio. O material de origem é representado pela caolinita....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Seqüência de solos; Latossolos Amarelos; Formação Barreiras; Região de Tucuruí.
Ano: 1994
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000200022

Estimating foliar nitrogen in Eucalyptus using vegetation indexes
Provedor de dados: 63
Autores: Oliveira,Luiz Felipe Ramalho de; Oliveira,Marcio Leles Romarco de; Gomes,Francisco Sérgio; Santana,Reynaldo Campos.
ABSTRACT Nitrogen (N) has commonly been applied in Eucalyptus stands in Brazil and it has a direct relation with biomass production and chlorophyll content. Foliar N concentrations are used to diagnose soil and plant fertility levels and to develop N fertilizer application rates. Normally, foliar N is obtained using destructive methods, but indirect analyses using Vegetation Indexes (VIs) may be possible. The aim of this work was to evaluate VIs to estimate foliar N concentration in three Eucalyptus clones. Lower crown leaves of three clonal Eucalyptus plantations (25 months old) were classified into five color patterns using the Munsell Plant Tissue Color Chart. For each color, N concentration was determined by the Kjeldahl method and foliar reflectance...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Leaf nitrogen concentration; Non-destructive analyses; Spectrometer; Spectral reflectance; Leaf reflectance.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162017000200142

Phosphorus availability changes the internal and external endomycorrhizal colonization and affects symbiotic effectivenes
Provedor de dados: 63
Autores: Nogueira,Marco Antonio; Cardoso,Elke Jurandy Bran Nogueira.
Despite the awareness that high phosphorus (P) availability decreases the mycorrhizal root colonization in higher plants, the effects on the external mycelium are contradicting. The aim of this work was to assess the external mycelium of the arbuscular mycorrhizal fungi (AMF) Glomus intraradices and Gigaspora rosea, associated to soybean under increasing P levels (0, 25, 50, 100 and 200 mg kg-1). The tested hypotheses were: a) the amount of external mycelium depends on the fungal species; b) the P levels affect diferentially each mycorrhizal species; c) the mycorrhizal effectiveness depends on the amount of external mycelium. Mycorrhizal stimulus on plant biomass occurred at P levels of 0, 25 and 200 mg kg-1. Mycorrhizal root colonization and total...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Arbuscular mycorrhizal fungi; External mycelium; Soybean.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000300013

Experimentos em parcelas subdivididas com tratamentos primários em blocos incompletos parcialmente balanceados I: uma solução das equações normais
Provedor de dados: 63
Autores: Morais,A.R. de; Stolf Nogueira,M.C.
O objetivo deste trabalho foi realizar um estudo para obtenção de uma solução adequada das equações normais de experimentos em parcelas subdivididas com tratamentos primários dispostos segundo uma estrutura de blocos incompletos parcialmente balanceados.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Delineamento experimental; Equações normais; Blocos incompletos; Parcelas subdivididas.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000200008

A lima bean core collection based on molecular markers
Provedor de dados: 63
Autores: Gomes,Regina Lucia Ferreira; Costa,Marcones Ferreira; Alves-Pereira,Alessandro; Bajay,Miklos Maximiliano; Viana,João Paulo Gomes; Valente,Sérgio Emílio dos Santos; Lopes,Ângela Celis de Almeida; Zucchi,Maria Imaculada; Pinheiro,José Baldin.
ABSTRACT Some germplasm collections have a high number of accessions, which makes it difficult to explore the genetic variability present in the germplasm bank due to the redundancy and the difficulty of detailed analysis of all conserved accessions. Therefore, our study aimed to analyze the genetic diversity of 153 lima bean (Phaseolus lunatus) accessions for the purpose of constructing a core collection. Eleven SSRs were used for this purpose. The 153 lima bean accessions can be represented by low redundancy using a minimum of 34 accessions, thus representing 22 % of the size of the entire germplasm bank. The core collection had a higher Shannon diversity index and expected heterozygosity (1.906 and 0.811, respectively) than those presented by the entire...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Germplasm; Genetic diversity; Genetic structure; Microsatellite markers.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000201100

Thlastocoris laetus Mayr, 1866 (hemiptera: coreidae: acanthocerini) nueva plaga de la piña
Provedor de dados: 63
Autores: Couturier,G.; Brailovsky,H.; Zucchi,R.A.
Thlastocoris laetus (Hemiptera: Coreidae) es por primera vez señalado como plaga de la piña para la Amazonia brasileña y peruana comentando los daños que ocasiona. Se presenta la caracterización morfológica de esta especie, comparandola con Lybindus dichrous que también es reconocido como plaga de la piña en el Brasil. La distribución geográfica de ambas especies es citada.
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Chinche; Piña; Amazonia; Brasil; Perú; Plaga.
Ano: 1993
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161993000300029

Métodos de avaliação da qualidade fisiológica de sementes de brócolos
Provedor de dados: 63
Autores: Mello,Simone da Costa; Spinola,Maria Cristina Mingues; Minami,Keigo.
Sementes de brócolos foram submetidas aos testes de germinação, emergência de plântulas, envelhecimento acelerado (24, 48, 72 e 96 horas a 42°C) e condutividade elétrica (0,5, 2, 4, 12 e 24 horas de embebição a 25°C em 25, 50 e 75 ml de água), com o objetivo de comparar métodos de avaliação da qualidade fisiológica de diferentes lotes. Os testes de germinação, de emergência de plântulas e de condutividade elétrica (período de embebição de 24 horas com 25 ml de água) apresentaram resultados concordantes na diferenciação do vigor dos lotes. O teste de envelhecimento acelerado, a 42°C por um período de 48 horas, também permitiu a distinção do vigor dos lotes.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brassica oleracea; Brócolos; Vigor; Teste de germinação.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000500017

Crop residue harvest for bioenergy production and its implications on soil functioning and plant growth: A review
Provedor de dados: 63
Autores: Cherubin,Maurício Roberto; Oliveira,Dener Márcio da Silva; Feigl,Brigitte Josefine; Pimentel,Laisa Gouveia; Lisboa,Izaias Pinheiro; Gmach,Maria Regina; Varanda,Letícia Leal; Morais,Maristela Calvente; Satiro,Lucas Santos; Popin,Gustavo Vicentini; Paiva,Sílvia Rodrigues de; Santos,Arthur Klebson Belarmino dos; Vasconcelos,Ana Luisa Soares de; Melo,Paul Lineker Amaral de; Cerri,Carlos Eduardo Pellegrino; Cerri,Carlos Clemente.
ABSTRACT: The use of crop residues as a bioenergy feedstock is considered a potential strategy to mitigate greenhouse gas (GHG) emissions. However, indiscriminate harvesting of crop residues can induce deleterious effects on soil functioning, plant growth and other ecosystem services. Here, we have summarized the information available in the literature to identify and discuss the main trade-offs and synergisms involved in crop residue management for bioenergy production. The data consistently showed that crop residue harvest and the consequent lower input of organic matter into the soil led to C storage depletions over time, reducing cycling, supply and availability of soil nutrients, directly affecting the soil biota. Although the biota regulates key...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bioenergy feedstock; Soil quality; Sugarcane; Greenhouse gas emissions.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162018000300255

Intercropping of wheat changed cucumber rhizosphere bacterial community composition and inhibited cucumber Fusarium wilt disease
Provedor de dados: 63
Autores: Jin,Xue; Shi,Yajing; Wu,Fengzhi; Pan,Kai; Zhou,Xingang.
ABSTRACT: Enhancing the plant rhizosphere microbial community function by increasing plant diversity in the field is a promising strategy for enhancing agricultural sustainability. This study evaluated the effectiveness of the intercropping of wheat in controlling cucumber Fusarium wilt disease. Bacterial community diversity and abundance in cucumber rhizosphere were estimated by high-throughput amplicon sequencing and quantitative polymerase chain reaction (PCR). Results showed that the intercropping of wheat inhibited the severity of cucumber seedling Fusarium wilt disease, increased the alpha diversity and altered the composition of the bacterial community in cucumber rhizosphere. Compared with monocropped cucumber, intercropped cucumber had higher...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cucumis sativus L.; Triticum aestivum L.; Fusarium oxysporum f.sp. cucumerinum; Pseudomonas spp.; Bacterial diversity.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000500202

Morfologia floral e biologia reprodutiva de genótipos de aceroleira
Provedor de dados: 63
Autores: Gomes,José Everaldo; Pavani,Maria do Carmo M.D.; Perecin,Dilermando; Martins,Antônio Baldo Geraldo.
Estudos sobre morfologia floral e biologia reprodutiva de uma cultura contribuem para o desenvolvimento de técnicas de castração e polinização. Com este propósito, estudaram-se a estrutura e a biologia floral em cinco genótipos de aceroleira (Malpighia emarginata), em Jaboticabal, SP; no período de dezembro/97 a janeiro/99. Foi avaliada a morfologia floral, por caracterização e quantificação, e a biologia reprodutiva, desde o aparecimento dos primórdios do botão floral até a abertura. As flores da aceroleira são monóclinas, com cálice composto por seis a sete sépalas, corola de cinco pétalas, nove a dez glândulas presentes na base, androceu com dez estames e gineceu com três a quatro pistilos e distribuem-se em cimeiras axilares com 3 a 13 flores nos ramos...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Malpighia emarginata; Floração; Morfologia.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000300013

Software para dimensionamento de irrigação por sulcos
Provedor de dados: 63
Autores: Botrel,Tarlei Arriel; Marques,Patricia Angélica Alves.
Considerando a importância da irrigação por sulcos e devido a este sistema de irrigação necessitar de trabalhosos cálculos e ensaios de campo para seu projeto, o presente trabalho teve como objetivo apresentar o software Sulcos 2000, para Windows 95, desenvolvido em linguagem Delphi 3.0. Este software auxilia a elaboração de projetos de irrigação por sulcos através de procedimentos de cálculos automáticos que agilizam e possibilitam testar várias situações durante a fase de projeto. Também permite a obtenção da equação de infiltração através do ensaio de campo, já a equação de avanço pelo ensaio de campo e pela simulação. À partir destas equações realiza-se os cálculos referentes ao projeto e fornece-se uma avaliação da irrigação. Os dados são salvos em um...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Irrigação; Sulcos; Software.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000400034

The nutritional value of leaves of selected berry species
Provedor de dados: 63
Autores: Biel,Wioletta; Jaroszewska,Anna.
ABSTRACT: Although the medicinal properties of berry fruit are well known, there is relatively little information available concerning the applications of other parts of berry plants. Thus, in this study we determined the nutritional value of the leaves of selected berry species and their possible application in health promoting diets. The levels of nutrients, and macro- and microelements in the leaves of four species collected from allotment gardens in the city of Szczecin, Poland (53°26′17″ N, 14°32′32″ E; altitude 7 m a.s.l.) were identified: raspberry (Rubus idaeus L.), blackberry (Rubus fruticosus L.), chokeberry (Aronia melanocarpa L.), and sea buckthorn (Hippophae rhamnoides L.). Sea buckthorn leaves were the richest source of protein, raspberry...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nutrients; Berry plant leaves; Macroelements; Microelements.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162017000500405

Chilling effect on soluble sugars, respiration rate, total phenolics, peroxidase activity and dormancy of onion bulbs
Provedor de dados: 63
Autores: Benkeblia,Noureddine; Shiomi,Norio.
Besides onions being one of the most cultivated and consumed vegetables, during storage onion bulbs are still affected by many physiological, biochemical and technological factors which can influence their quality. Respiration rate (RR O2), soluble sugars (SS), total phenolics (TP), and peroxidase (POD) activity were measured in inner bud tissues during a dormancy break of onion bulbs treated four weeks at 0ºC and stored in the dark at 20ºC. Control bulbs were stored simultaneously in the same condition. Breakage of dormancy was checked by the appearance of first green internal leaves by cutting longitudinally 30 bulbs. After eight weeks, RR O2 of sprouted onions was 52% higher than that of freshly harvested and dormant bulbs. One week after cooling SS...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: O2 consumption; Saccharides; Phenolics; Peroxidase; Sprouting.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000300007

Growth of Bauhinia forficata Link, Curcuma zedoaria Roscoe and Phaseolus vulgaris L. cell suspension cultures with carbon sources
Provedor de dados: 63
Autores: Mello,Marcia Ometto; Dias,Carlos Tadeu Santos; Amaral,Antônio Francisco Campos; Melo,Murilo.
Cell suspension cultures of Bauhinia forficata Link, Curcuma zedoaria Roscoe and Phaseolus vulgaris L. were used to test plant ability to utilize an alternative to sucrose as carbon source and energy for growth. Glycerol, sorbitol and galactose were the alternative carbon sources tested. Cell suspension cultures established on liquid medium containing sucrose were transferred to culture medium supplemented with sucrose or glycerol, or sorbitol, or galactose as the sole carbon source. Fresh and dry weight increasing and protein content showed marked differences among the different carbon sources used. Sucrose was the best carbon source for all the three plant species tested. Galactose and glycerol promoted slow or no growth of the three studied species....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sucrose; Glycerol; Sorbitol; Galactose; Tissue culture.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000300007

Produção de bulbinhos de cebola em bandejas de isopor
Provedor de dados: 63
Autores: Cardoso,Antonio Ismael Inácio; Costa,Cyro Paulino da.
Com o objetivo de estudar a viabilidade de produção de bulbinhos de cebola sob ambiente protegido em diferentes tipos de bandejas de poliestireno expandido foram instalados dois experimentos. No primeiro, trabalhando com a cultivar Serrana, foram avaliadas três tipos de bandejas com diferentes números de plantas por célula: uma planta/célula na bandeja de 288 células, três a cinco plantas/célula na de 128 e cinco a nove plantas/célula na de 72 células. No outro experimento, testaram-se nove cultivares, semeadas somente em bandejas de 128 células com três plantas por célula. Utilizou-se o delineamento em blocos ao acaso com quatro repetições no primeiro ensaio e cinco no segundo, sendo cada parcela constituída por uma bandeja. Observou-se que quanto maior a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Allium cepa; Bulbinhos; Bandeja.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000400026

Transpiration of young cocoa trees under soil water restriction
Provedor de dados: 63
Autores: Fraga Junior,Luciano Sobral; Vellame,Lucas Melo; Oliveira,Aureo Silva de; Paz,Vital Pedro da Silva.
ABSTRACT: Cocoa plantations in Brazil have been expanding beyond the borders of traditional regions by implementing a strategy based on irrigation and the establishment of crops exposed to full sunlight. The quantification of transpiration is essential to the establishment and management of crops, and is the main factor in the determination of water demand. This study had as its objective the estimating of transpiration of young cocoa trees as a function of reference evapotranspiration (ETo) and soil matric potential (Ψw). Two experiments were conducted, one in a greenhouse and the other in the field, using clones and seminal plants. Soil water content, plant transpiration and reference evapotranspiration were monitored. Cocoa trees were subjected to soil...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Theobroma cacao L.; Sapflow; Evapotranspiration; Water deficit.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000200301

Cruzamentos dialélicos de linhagens de milho sob condições de mancha de Phaeosphaeria
Provedor de dados: 63
Autores: Paterniani,Maria Elisa Ayres Guidetti Zagatto; Sawazaki,Eduardo; Dudienas,Christina; Pereira,José Carlos Vila Nova Alves.
Híbridos simples de milho resultantes de cruzamentos dialélicos entre dez linhagens endogâmicas provenientes do CIMMYT foram avaliados em 4 locais do Estado de São Paulo (Estações Experimentais do IAC), em 1996/97, quanto à estabilidade e adaptabilidade da produtividade de grãos. Os ensaios foram instalados sob delineamento de blocos casualizados com três repetições, incluindo quatro testemunhas comerciais. Foi verificada grande previsibilidade da produção e adaptabilidade ampla (b=1,0) da maioria dos híbridos, indicando que o conjunto de linhagens é fonte potencial de híbridos heteróticos e de estabilidade satisfatória. Houve intensa severidade da mancha foliar de Phaeosphaeria maydis em Ribeirão Preto, considerada um dos fatores de estresse que mais...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phaeosphaeria maydis Zea mays adaptabilidade estabilidade; Híbrido.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000200019

Yield components and morphogenesis of Aruana grass in response to nitrogen supply
Provedor de dados: 63
Autores: Lavres Jr.,José; Ferragine,Maria Del Carmen; Gerdes,Luciana; Raposo,Roberto Wagner Cavalcanti; Costa,Michelle Nazaré Xavier da; Monteiro,Francisco Antonio.
Areas with Aruana grass (Panicum maximum Jacq.) in Brazilian pastures, especially those used by sheep, have expanded due to yield and morphological characteristics of this grass that are favorable to these animals. Nevertheless, the knowledge concerning yield attributes of this grass in relation to nitrogen fertilization is very limited. The objective of this research was to evaluate yield and physiological attributes in this forage grass when grown in nutrient solutions containing N rates. The experiment was carried out in a greenhouse with plastic pots containing ground quartz as substrate, during the Spring season. Six N rates in the solution (14, 112, 210, 294, 378, and 462 mg L-1), with 70% N-NO3- and 30% N-NH4+ were tested. Experimental units were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Panicum maximum; Leaf area; Phyllochron; Leaves; Tillering.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000600011

15N-labeled nitrogen from green manure and ammonium sulfate utilization by the sugarcane ratoon
Provedor de dados: 63
Autores: Ambrosano,Edmilson José; Trivelin,Paulo Cesar Ocheuze; Cantarella,Heitor; Ambrosano,Gláucia Maria Bovi; Schammass,Eliana Aparecida; Muraoka,Takashi; Rossi,Fabrício.
Legumes as green manure are alternative sources of nitrogen (N) for crops and can supplement or even replace mineral nitrogen fertilization due to their potential for biological nitrogen fixation (BNF). The utilization of nitrogen by sugarcane (Saccharum spp.) fertilized with sunn hemp (Crotalaria juncea L.) and ammonium sulfate (AS) was evaluated using the 15N tracer technique. N was added at the rate of 196 and 70 kg ha-1 as 15Nlabeled sunn hemp green manure (SH) and as ammonium sulfate (AS), respectively. Treatments were: (i) Control; (ii) AS15N; (iii) SH15N + AS; (iv) SH15N; and (v) AS15N + SH. Sugarcane was cultivated for five years and was harvested three times. 15N recovery was evaluated in the two first harvests. In the sum of the three harvests,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Saccharum spp.; Brazil; Sunn hemp; Isotope technique.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000300014

Field-scale spatial correlation between contents of iron oxides and CO2 emission in an Oxisol cultivated with sugarcane
Provedor de dados: 63
Autores: Bahia,Angélica Santos Rabelo de Souza; Marques Júnior,José; Panosso,Alan Rodrigo; Camargo,Livia Arantes; Siqueira,Diego Silva; Teixeira,Daniel De Bortoli; Scala Júnior,Newton La.
Soil CO2 emission (FCO2) is one of the main sources of carbon release into the atmosphere. Moreover, FCO2 is related to soil attributes governing the transfer of gases from soil to the atmosphere. This study aimed firstly to describe the spatial variability of hematite (Hm), goethite (Gt), iron extracted with sodium dithionite-citrate-bicarbonate (Fed) contents, soil CO2 emission (FCO2) and free-water porosity (FWP) and secondly, to develop statistical models to predict the above mentioned factors in an Oxisol cultivated under manual harvesting of sugarcane (Saccharumspp.) in southeastern Brazil. The study was conducted on an irregular 50 m × 50 m grid containing 89 points, each 0.5-10 m apart. The 0-0.1 m soil layer at each sampling point was used to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hematite; Goethite; Soil respiration; Geostatistics; Cross-semivariograms.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162015000200157

Diallel analyses and estimation of genetic parameters of hot pepper (Capsicum chinense Jacq.)
Provedor de dados: 63
Autores: Sousa,João Alencar de; Maluf,Wilson Roberto.
The degree of heterosis in the genus Capsicum spp. is considered high; however, most of the studies refer to the species Capsicum annuum L. In spite of the potential use of F1 hybrids in pungent peppers of the species Capsicum chinense, few studies are available which assess the magnitude of heterosis in this species . This study was carried out to assess heterosis and its components in F1 hybrids from a diallel cross between hot pepper lines (Capsicum chinense) and to obtain data on the allelic interaction between the parents involved in the crosses. Trials were made in Rio Branco-Acre, Brazil, from March through October 1997. A randomized complete block design with fifteen treatments and three replications was used. The treatments were five C. chinense...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Xanthomonas campestris pv. vesicatoria; Hot pepper; Gene action; Capsaicin.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000100016

Rates of calcium, yield and quality of snap bean
Provedor de dados: 63
Autores: Favaro,Simone Palma; Braga Neto,José Antônio; Takahashi,Hideaki Wilson; Miglioranza,Édison; Ida,Elza Iouko.
Calcium ions (Ca) play an important role in many biochemical processes, delaying senescence and controlling physiological disorders in fruits and vegetables. The objective of this experiment was to analyze the effect of increasing calcium concentrations in snap beans. Snap bean cultivar UEL 1 was sown in sand containing 80 mg L-1 of calcium supplemented with nutrient solution, plus calcium at different contents: 0, 75, 150 and 300 mg L-1. Ca was mainly recovered in the shoots, followed by roots and pods. Calcium concentrations in the pods were 130, 259, 349 and 515 mg 100 g-1dry matter on a dry weight basis, in relation to the enhancement of calcium contents in the nutrient solution, respectively. A negative relationship between nitrogen content in the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phaseolus vulgaris L.; Biomass production; Pod; Nutrient solution; Nitrogen.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000600009

Métodos de formação de mudas de maracujazeiro amarelo
Provedor de dados: 63
Autores: Verdial,Marcelo Fontanetti; Lima,Márcio Santos de; Tessarioli Neto,João; Dias,Carlos Tadeu dos Santos; Barbano,Marcelo Trevizan.
Grande parte do sucesso de uma cultura está em implantá-la com mudas de alta qualidade. O objetivo do estudo foi avaliar métodos de formação de mudas de maracujazeiro amarelo quanto à qualidade das muda formada. Os tratamentos utilizados foram: 1- Mudas formadas em sacolas plásticas, preenchidas com terra adubada e misturada com esterco de curral curtido, com fertirrigação uma vez por semana; 2- Mudas formadas em tubetes de plástico rígido, com substrato à base de casca de pinus e vermiculita, mantidos em bancada e recebendo fertirrigação uma vez por semana; 3- Idêntico ao tratamento 2, utilizando-se bandejas de poliestireno expandido; 4- Idêntico ao tratamento 3, sem fertirrigação, mas com uso de "floating" a cada dois dias; 5- Idêntico ao tratamento 4,...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: 'floating'; Maracujá; Muda; Condicionamento.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000400032

Duration of hydrothermal treatment and peeling of 'Murcott' tangor
Provedor de dados: 63
Autores: Pinheiro,Ana Luiza; Jacomino,Angelo Pedro; Arruda,Maria Cecília de; Kluge,Ricardo Alfredo.
Hydrothermal treatment facilitates the peeling of 'Pera' sweet orange fruit and does not alter its quality. The aim of this work was to adapt the technology of peeling for the use of hydrothermal treatment in 'Murcott' tangor and to evaluate its influence in the CO2 production and the physicochemical, microbiologic and sensorial characteristics of fruits. The peeling time, the yield of marketable fruits and the internal temperature of fruits during the treatment were also evaluated. The hydrothermal treatment consisted of placing the fruits in a water-bath at 50 ºC for 5, 10, 15, 20, 25 and 30 min. Fruits were peeled by first opening a gap in the peduncle region with a knife and then manually removing the flavedo and albedo. Fruits were stored at 5 ºC for...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fresh-cut; Heating; Quality; Appearance; Easy peeling.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000600005

Technological, physicochemical and sensory characteristics of a Brazilian semi-hard goat cheese (coalho) with added probiotic lactic acid bacteria
Provedor de dados: 63
Autores: Oliveira,Maria Elieidy Gomes de; Garcia,Estefânia Fernandes; Queiroga,Rita de Cássia Ramos do Egypto; Souza,Evandro Leite de.
Over the past few years, the use of probiotics, which are capable of exerting beneficial effects on the composition of intestinal microbiota, has increased. Cheeses have been suggested as a better carrier of probiotic bacteria than other fermented milk products. The effect of added cultures of probiotic lactic acid bacteria on the quality of a Brazilian goat semi-hard cheese (coalho) was assessed during 21 days of storage at 10 ºC as follows: C1, Lactococcus lactis subsp. lactis and L. lactis subsp. Cremoris (standard cheese); C2, Lactobacillus acidophilus (LA-5); C3, Lactobacillus paracasei (Lactobacillus casei-01); C4, BBifidobacterium lactis (BB12); and C5, L. acidophilus, L. paracasei and B. lactis. Differences in some physico-chemical, experimental...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dairy product; Probiotic microorganisms; Quality evaluation.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162012000600005

Copper availability as related to soil copper fractions in oxisols under liming
Provedor de dados: 63
Autores: Nascimento,Clístenes Williams Araújo do; Fontes,Renildes Lúcio Ferreira; Melicio,Adilson César Fortes Dias.
The knowledge of the chemical forms of copper in soils and the relationships of these forms with soil copper availability are important for predicting the copper behavior in the soil-plant system. The present work studies the influence of liming on the available contents of copper as well as on the forms of copper fractions in six types of Oxisols. Soil samples, with and without liming, received copper at rates of 0.0, 20.0 and 40.0 mg dm-3 and remained incubated for 30 days. Then, available copper was extracted with Mehlich-1, Mehlich-3, DTPA and EDTA solutions, and analyzed by atomic absorption spectrophotometry. Additionally, soil samples were extracted in a sequential procedure to determine Cu in fractions of soil, as follows: exchangeable-Cu fraction,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fractioning; Micronutrients; Soil analysis.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000100025

Procedures for identification of superior progenies in successive generations of evaluation in common bean
Provedor de dados: 63
Autores: Lemos,Roxane do Carmo; Abreu,Ângela de Fátima Barbosa; Ramalho,Magno Antonio Patto.
ABSTRACT: When breeding the common bean in Brazil, the best progenies are chosen, normally, from solely the generation under analysis at the conclusion of the evaluation, without considering what occurred in the past. However, a number of recently published studies show that if an evaluation were to consider all relevant generations, the gain from selection could be higher, especially when an index that involves information from the population that gave rise to the progenies is used. Thus, the aim of this study was to compare three selection procedures in the evaluation of successive generations and to discuss the implications of the progeny × environment interaction in terms of success of selection. Cycle XV progenies from a bean recurrent selection...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phaseolus vulgaris; Recurrent selection; Selection index; Mixed model approach.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000101101

The life-time concept as a tool for erosion tolerance definition
Provedor de dados: 63
Autores: Sparovek,G.; Weill,M.M.; Ranieiri,S.B.L.; Schnug,E.; Silva,E.F.
By definition, erosion tolerance should consider the conservation of the soil as a natural resource essential for crop production. Erosion rates greater than soil renewal will cause soil depth loss. A minimum soil depth was defined as the depth in which the inputs (fertilizers, crop residues) and management technology (irrigation, improved genetic crop quality) were insufficient to prevent economic productivity loss. Thus, erosion rates greater than soil formation are acceptable only during the time in which the soil does not reach the minimum depth. We have defined this time period as life-time. The life-time concept was applied to the Ceveiro watershed (1,945 ha) located in a sugarcane growing region in the Southeast of Brazil Erosion rates were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Erosion tolerance; Life-time.
Ano: 1997
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161997000300015

QUANTIFICAÇÃO DE LACTOSE EM QUEIJOS MINAS FRESCAL
Provedor de dados: 63
Autores: Caruso,E.C.; Oliveira,A.J. de.
O principal objetivo deste trabalho foi verificar a aplicabilidade do método de Acton na determinação de lactose em queijo tipo Minas Frescal e, para isso estudou-se a porcentagem de recuperação de lactose adicionada a amostras dos queijos, em diferentes situações. As recuperações variam de 99,1% e 103,7% , e os melhores resultados em torno de 100%, obtidos para as amostras preparadas contendo até 40 &lt;FONT FACE="Symbol"&gt;m&lt;/font&gt;g de lactose / ml. Os queijos tipo Minas Frescal, de três lotes diferentes com três queijos por lote, foram adquiridos no comércio de Piracicaba, SP aos dois dias de fabricação e nesse mesmo dia, analisados para o teor de lactose. Os resultados variaram de 2,36% a 2,47% no lote 1; 2,68% a 3,03% no lote 2 e 2,19% a 2,48%...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Queijo; Lactose; Carboidratos; Laticínios.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000100033

New record of Tetrastichus howardi (Olliff) as a parasitoid of Diatraea saccharalis (Fabr.) on maize
Provedor de dados: 63
Autores: Cruz,Ivan; Redoan,Ana Carolina; Silva,Rafael Braga da; Figueiredo,Maria de Lourdes Corrêa; Penteado-Dias,Angélica Maria.
Diatraea saccharalis (Fabr.) (Lepidoptera: Pyralidae) spends the largest part of its life cycle inside the stalk of the host plant,which provides protection against the action of conventional control methods. Biological control has been considered a viable alternative to control this pest in sugarcane (Saccharum officinarum L.) and corn (Zea mays L.), two pest preferential hosts. This paper reports the occurrence in Brazil of Tetrastichus howardi (Olliff) (Hymenoptera; Chalcidoidea: Eulophidae) parasitizing pupae of D. saccharalis obtained from corn plants. It also includes preliminary biological data about the insect. A single female of T. howardi is able to produce up to 66 offspring using a single pupa of the host D. Saccharalis and apparently does not...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Biological control; Host-parasitoid interactions; Maize pest; Sugarcane borer; Parasitism.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000200017

Caracterizacion de nueve genotipos de maiz (Zea mays L.) en relacion a area foliar y coeficiente de extincion de luz
Provedor de dados: 63
Autores: Camacho,R.G.; Garrido,O.; Lima,M.G.
Se caracterizaron nueve materiales genéticos de maíz (Arichuna, Baraure, Braquítico, Experimental-2, Foremaíz PB, FM-6, Obregón, Proscca-71 y Tocorón), en relación con área promedio de hoja por planta, área foliar total por planta (AFT), índice de área foliar (IAF), y coeficiente de extinción de luz (K) a 0,50 m, 1,00 m, 1,50 m, 2,00 m y 2,50 m de altura de la planta (medidos a partir del suelo). Además, estudios de correlación y regresión simple fueron hechos entre rendimiento (R) y IAF. Se encontraron rangos de variación para las diversas variables: Area promedio de hoja por planta(471cm² para Foremaiz PB y 606 cm² para Baraure); AFT ( 5 327cm² en Foremaiz PB y 8 411 cm² para Braquítico); IAF (4,26, Foremaiz PB y 6,67, Braquítico); K (0,23 para...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Maíz; Índice de área foliar; Coeficiente de extinción de luz; Rendimiento.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000200015

Selection methods for maize seedlings in greenhouse as related to aluminum tolerance
Provedor de dados: 63
Autores: Giaveno,Carlos Daniel; Miranda Filho,José Branco de.
Genetic improvement is a useful approach to increase aluminum tolerance in maize. This experiment was carried out to compare two screening techniques under greenhouse conditions and estimate the association between the results obtained for both bioassays with grain yield. Nutrient solution (NS) and pots with acid soil (AS) were utilized as screening methodologies to perform one cycle of divergent selection for aluminum tolerance in the tropical maize population SIKALQ. The four sub-populations obtained by both approaches were compared with the original and checks in a greenhouse and in multilocation field trials. Evaluation under the conditions of NS and AS showed that the populations with the best performances were those selected for aluminum tolerance...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Zea mays; Acid soils; Stress; Divergent selection.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000400028

Production of iceberg lettuce using mulches
Provedor de dados: 63
Autores: Verdial,Marcelo Fontanetti; Lima,Márcio Santos de; Morgor,Átila F.; Goto,Rumy.
Mulches bring several benefits to lettuce cultivation. This work evaluated the effect of mulches on the cultivation of iceberg lettuce, cv. Lucy Brown. The treatment plots were: 1- no mulch and no weed control (control); 2- no mulch and weed control every 15 days; 3- sugarcane bagasse mulch of 2 cm thickness; 4- black plastic mulch; 5- double-faced plastic mulch (silver/black). Data were collected in regard to plant cycle when in the field, amount of chlorophyll in the leaves, productivity (individual weight per head) and amount of nutrients absorbed by the leaves. Double-faced plastic mulch provides the highest productivity and the highest values for the amount of chlorophyll, nitrogen, phosphorus, sulfur, boron and iron accumulation in the leaves.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lactuca sativa; Mulching; Soil temperature; Nutrient.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000400014

Ecological aspects of Bacillus thuringiensis in an Oxisol
Provedor de dados: 63
Autores: Ferreira,Lessandra Heck Paes Leme; Suzuki,Marise Tanaka; Itano,Eiko Nakagawa; Ono,Mário Augusto; Arantes,Olívia Márcia Nagy.
Bacillus thuringiensis is a Gram positive, sporangial bacterium, known for its insecticidal habilities. Survival and conjugation ability of B. thuringiensis strains were investigated; vegetative cells were evaluated in non-sterile soil. Vegetative cells decreased rapidly in number, and after 48 hours the population was predominantly spores. No plasmid transfer was observed in non-sterile soil, probably because the cells died and the remaining cells sporulated quickly. Soil is not a favorable environment for B. thuringiensis multiplication and conjugation. The fate of purified B. thuringiensis toxin was analyzed by extractable toxin quantification using ELISA. The extractable toxin probably declined due to binding on surface-active particles in the soil.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Population dynamics; Insecticidal crystal protein; Conjugation.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000100004

Resposta da figueira (Ficus carica L.) ao uso da irrigação e nitrogênio na região de Ilha Solteira
Provedor de dados: 63
Autores: Hernandez,F.B.T.; Suzuki,M.A.; Buzetti,S.; Correa,L.S.
Com o objetivo de avaliar a resposta da cultura da figueira (safra 91/92) à aplicação de lâminas de irrigação e adubação nitrogenada realizou-se um experimento com seis lâminas de irrigação (O, 25, 50, 75,100 e 125% da evaporação do Tanque Classe A) e seis níveis de nitrogênio (0,150,300,450,600 e 750 g/planta), instalado de acordo com um delineamento de blocos casualizados, em um esquema de parcelas sub-divididas, com quatro repetições. Com base na análise estatística realizada, verificou-se efeito significativo da irrigação sobre a produtividade de frutos maduros, produtividade total, comprimento de ramos e altura e diâmetro de frutos maduros. A adubação nitrogenada mostrou efeito significativo sobre a produtividade de frutos maduros e comprimento de...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Figo; Irrigação; Nitrogênio.
Ano: 1994
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000100016

Leaf consumption by Diabrotica speciosa (Coleoptera: Chrysomelidade) adults on difFerent host plants
Provedor de dados: 63
Autores: Ávila,Crébio José; Parra,José Roberto Postali.
Studies related to the feeding behavior of pest insects provide information that will aid the development of control tactics. Leaf consumption by Diabrotica speciosa adults fed on bean, corn, potato and soybean was determined in the laboratory under free-choice (multiple or double-choice) and no-choice (confinement) conditions. In the multiple-choice tests leaf circles were randomly arranged in a circular pattern (arena) inside Petri dishes. The degree of preference for the hosts was determined under double-choice conditions, where common bean was considered the standard host and the remaining plants (soybean, potato and corn) as test hosts. In all trials, two Diabrotica speciosa couples were released and maintained within the dish for 24 hours; the leaf...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Insect; Root worm; Host plant; Food preference; Food intake.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000400028

Green-manure turnip for soybean based no-tillage farming systems in eastern Paraguay
Provedor de dados: 63
Autores: Kubota,Aki; Hoshiba,Kent; Bordon,Jorge.
A no-tillage soybean-wheat cropping system has been practiced for many years on the "Terra Rossa" soils of eastern Paraguay. Soil compactness and soil erosion have recently been identified as potential problems. This study examines the effect of replacing unprofitable wheat by green-manure turnip (Raphanus sativus L. var. oleiferus Metzg.) on soil properties and soybean production. Gaseous phase, porosity, bulk density, water saturation, cone index, pH, exchangeable-cations, available-phosphorus (P) and aggregate size distribution of the soil were measured. Contrary to initial expectations, turnip did not reduce soil compactness. Instead, turnip stabilized the aggregate structure of the surface soil. Positive effects of turnip on subsequent soybean growth...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil compactness; Aggregate structure; Crop residue; Nutrient return.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000200010

Plant regeneration from cotyledonary explants of Eucalyptus camaldulensis
Provedor de dados: 63
Autores: Dibax,Roberson; Eisfeld,Cristiane de Loyola; Cuquel,Francine Lorena; Koehler,Henrique; Quoirin,Marguerite.
Breeding methods based on genetic transformation techniques need to be implemented for Eucalyptus camaldulensis to shorten the long breeding cycles and avoid manipulation of adult trees; that requires the development of plant regeneration protocols enabling development of plants from transformed tissues. The present work aimed to optimise the regeneration process already established for the species. Cotyledonary leaves of E. camaldulensis were cultured in MS medium supplemented with naphthaleneacetic acid (NAA) and 6-benzylaminopurine (BAP) combinations. The most efficient treatment for bud indirect regeneration (2.7 µmol L-1 NAA and 4.44 µmol L-1 BAP) was used for further experiments. When explants were kept in the dark during the first 30 days, the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: In vitro culture; Forest species; Culture media; Organogenesis.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000400016

Alkanes as markers in nutritional studies with wild ruminant and non-ruminant animals
Provedor de dados: 63
Autores: Oliveira,Dimas Estrasulas de; Silva,Sila Carneiro da.
Knowledge of information relative to the digestibility, intake and botanical and morphological composition of the diet is important in nutritional studies, since it provides the basis for understanding aspects related to the ingestive behavior and selectivity of animals. N-alkanes have been used successfully as markers in studies with many species of animals, particularly domesticated ruminants, most of the times as replacements for conventional markers as chromium oxide for example. However, for wild ruminants and non-ruminant animals information on this technique is still scarce and, as a consequence, its potential for use unknown. This review reports the use of this technique in studies of feed digestibility, intake and diet composition with wild...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Digestibility; Diet composition; Feed intake; Forages; Hydrocarbons.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000600015

Local food: benefits and failings due to modern agriculture
Provedor de dados: 63
Autores: Coelho,Fábio Cunha; Coelho,Enilce Maria; Egerer,Monika.
ABSTRACT: This paper aims to examine the issue raised by the consumption of locally produced food in all its various aspects, and in particular, addresses how this practice contributes to local and global sustainability. It analyzes the different definitions of local food, the strategies used, the implications of the distance traveled in the transportation of food to the consumer's table – food miles, the relationships between local food consumption and sustainability, farming practices that reduce carbon emissions, contribution of urban agriculture to local food, local trading of food produced by rural farmers, as well as a number of relationships between the consumption of local food and human nutrition and health, local food protection and the ability...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Food consumption; Food miles; Greenhouse gases; Sustainability.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162018000100084

Acylated anthocyanins from organic purple-fleshed sweet potato (Ipomoea batatas (L.) Lam) produced in Brazil
Provedor de dados: 63
Autores: Jesus,Monalisa Santana Coelho de; Santiago,Manuela Cristina Pessanha de Araújo; Pacheco,Sidney; Gouvêa,Ana Cristina Miranda Senna; Nascimento,Luzimar da Silva de Mattos do; Borguini,Renata Galhardo; Guerra,José Guilherme Marinho; Espindola,José Antonio Azevedo; Godoy,Ronoel Luiz de Oliveira.
ABSTRACT Acylated anthocyanins from a purple-fleshed sweet potato (PFSP), obtained by organic cultivation in Brazil, were characterized after separation by a high performance liquid chromatography-diode array detector (HPLC-PDA). These anthocyanins were manually collected at the detector output, concentrated and injected into a high resolution mass spectrometer (ESI-QTOF-MS2). Twenty-two acylated anthocyanins were detected. Among them, sixteen had been reported in the literature and six, derived from peonidin were reported for the first time in sweet potato roots in this study. These compounds showed molecular ions with accurate mass/charge ratios (m/z) of 909.2081, 961.3010, 961.2571, 963.3345, 1123.2932 and 1179.3862. Although anthocyanins in PFSP have...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phenolic; Mass spectrometry; Natural dye; Antioxidant.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000400901

Attributes related to seasonal herbage growth in white clover
Provedor de dados: 63
Autores: Scheneiter,Omar; Rosso,Beatriz; Corletto,Mauro.
When breeding temperate forage species is investigated, some attributes such as herbage accumulation and seasonal growth patterns have to be considered. To modify some of these traits, knowledge of the detailed process might be useful. In order to evaluate seasonal growth of contrasting white clover populations an experiment was carried out. Treatments were five cultivars and three local populations collected in Argentina. Weekly measures were taken during each season to calculate leaf appearance and flower appearance rates, stolon growing rate and dry matter (DM) net accumulation. Different germplasm of this species have different mechanisms for DM accumulation. Leaf size, more than leaf appearance rate, was the variable with most differences among...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Trifolium repens L.; Germplasm; Leaves; Inflorescences; Stolon growth.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000100003

ÍNDICES BIOCLIMÁTICOS PARA A  CULTURA DE GIRASSOL
Provedor de dados: 63
Autores: SENTELHAS,P.C.; UNGARO,M.R.G.
Foram avaliados cinco índices bioclimáticos para a estimativa da duração do ciclo de dois cultivares e de um híbrido de girassol, em Monte Alegre do Sul, SP. Os índices avaliados foram: índice térmico (IT); unidades heliotérmicas (UH); acúmulo da radiação fotossinteticamente ativa (ARFA); índice heliotérmico de Geslin (IHG); acúmulo da evapotranspiração potencial (AETP). Foram avaliados dois cultivares, IAC-Anhandy e VNIIMK, e o híbrido Contisol-621, os quais foram semeados mensalmente, totalizando 22 épocas distintas, variando de 14/01/88 a 19/01/90. Através do CV(%) foi possível verificar que o IT foi o índice que apresentou a menor variação ao longo das diferentes épocas de semeadura, com valores de CV de 4,5 e 5,9%, respectivamente, para os cultivares...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Girassol; Índice bioclimático; IAC-Anhandy; Contisol-621; VNIIMK.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000100013

Spatio-temporal modelling of coffee berry borer infestation patterns accounting for inflation of zeroes and missing values
Provedor de dados: 63
Autores: Ruiz-Cárdenas,Ramiro; Assunção,Renato Martins; Demétrio,Clarice Garcia Borges.
The study of pest distributions in space and time in agricultural systems provides important information for the optimization of integrated pest management programs and for the planning of experiments. Two statistical problems commonly associated to the space-time modelling of data that hinder its implementation are the excess of zero counts and the presence of missing values due to the adopted sampling scheme. These problems are considered in the present article. Data of coffee berry borer infestation collected under Colombian field conditions are used to study the spatio-temporal evolution of the pest infestation. The dispersion of the pest starting from initial focuses of infestation was modelled considering linear and quadratic infestation growth...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Markov chain Monte Carlo methods; Risk maps; Mixture model; Zero inflated model; Multiple imputation.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000100014

Pilocarpine content and molecular diversity in jaborandi
Provedor de dados: 63
Autores: Sandhu,Sardul Singh; Abreu,Ilka Nacif; Colombo,Carlos Augusto; Mazzafera,Paulo.
Pilocarpine is an imidazol alkaloid exclusively found in Pilocarpus genus and P. microphyllus accumulates its highest content in the leaves. There is no report in the literature on the variability of the pilocarpine content in this genus. A population of 20 genotypes of P. microphyllus from the state of Maranhão, Brazil, was analyzed for Random Amplification of Polymorphic DNA (RAPD) markers and pilocarpine content. Although it was not possible to establish any correlation between these features, the absence or presence of some markers could indicate in some genotypes a possible association with the content of the alkaloid.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: RAPD; Pilocarpus jaborandi; Molecular diversity; Molecular markers.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000500010

Aggressiveness between genetic groups I and II of isolates of Cercospora zeae-maydis
Provedor de dados: 63
Autores: Mathioni,Sandra Marisa; Carvalho,; Brunelli,Kátia Regiane; Beló,André; Camargo,Luis Eduardo Aranha.
For many years, the gray leaf spot disease (GLS) caused by the fungus Cercospora zeae-maydis Tehon &amp;amp; Daniels, was not considered an important pathogen of maize (Zea mays, L.) in Brazil. However, the recent adoption of agronomical practices such as no-tillage and cultivation under central pivot irrigation systems increased the incidence and severity to the extent that GLS is now one of the most important diseases of maize. Isolates of C. zeae-maydis can be distinguished by two genetic groups (I and II) based on AFLP markers and on polymorphisms of the ITS and 5.8S rDNA regions. Until now, however, the biological implications of this distinction remain unclear. This study investigated whether isolates from the two genetic groups differ in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Disease resistance; Gray leaf spot; Genetic variability; Pathogenicity.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000600006

Worldwide geographical distribution of Black Sigatoka for banana: predictions based on climate change models
Provedor de dados: 63
Autores: Jesus Júnior,Waldir Cintra de; Valadares Júnior,Ranolfo; Cecílio,Roberto Avelino; Moraes,Willian Bucker; Vale,Francisco Xavier Ribeiro do; Alves,Fábio Ramos; Paul,Pierce Anderson.
As mudanças climáticas poderão alterar as doenças de plantas e afetar a eficácia das medidas de manejo. Um dos prováveis impactos será na distribuição geográfica das doenças. A Sigatoka Negra é considerada a principal doença da cultura da banana em decorrência dos danos causados e aumento do custo de manejo. O impacto sócio-econômico da doença continua aumentando, uma vez que a doença tem atingido novas áreas de plantio, tornando o manejo mais difícil. Este trabalho tem por objetivos comparar a distribuição geográfica da doença por meio da elaboração de mapas nas seguintes situações: a) clima atual e futuro (2020, 2050 e 2080), b) cenários A2 e B2 do Painel Intergovernamental de Mudanças Climáticas, c) predito por seis diferentes modelos de mudanças...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mycosphaerella fijiensis; Musa spp.; Mudanças climáticas globais.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000700008

Bioprospecting endophytic bacteria for biological control of coffee leaf rust
Provedor de dados: 63
Autores: Shiomi,Humberto Franco; Silva,Harllen Sandro Alves; Melo,Itamar Soares de; Nunes,Flávia Vieira; Bettiol,Wagner.
Suppression of plant diseases due to the action of endophytic microorganisms has been demonstrated in several pathosystems. Experiments under controlled conditions involving endophytic bacteria isolated from leaves and branches of Coffea arabica L and Coffea robusta L were conducted with the objective of evaluating the inhibition of germination of Hemileia vastatrix Berk. &amp;amp; Br., race II, urediniospores and the control of coffee leaf rust development in tests with leaf discs, detached leaves, and on potted seedling of cv. Mundo Novo. The endophytic bacterial isolates tested proved to be effective in inhibiting urediniospore germination and/or rust development, with values above 50%, although the results obtained in urediniospore germination tests...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hemileia vastatrix; Coffea spp.; Bacillus; Biocontrol.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000100006

Morphological characterization and reproductive aspects in genetic variability studies of forage peanut
Provedor de dados: 63
Autores: Oliveira,Marilda Augusta Peres; Valls,José Francisco Montenegro.
Morphological characterization and the study of reproductive behavior are important procedures to identify desirable traits of progenitors to be included in breeding programs. Morphological descriptors and the reproductive behavior of parental accessions of the legumes Arachis pintoi Krapov &amp;amp; W.C.Gregory and A. repens Handro were analyzed looking for the probable causes of seed production variability. Morphological and reproductive characterization were used for the estimation of the genetic variability of five A. pintoi and two A. repens accessions, with crosses being conducted in a greenhouse. Parents and hybrids have shown high pollen stainability, regular meiosis (2n=20), and presented distinctive reproductive behaviors: A. pintoi accessions GK...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Crossability; Germplasm; Legumes; Wild peanut.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000200014

Agronomic potential of genebank landrace elite accessions for common bean genetic breeding
Provedor de dados: 63
Autores: Bertoldo,Juliano Garcia; Coimbra,Jefferson Luís Meirelles; Guidolin,Altamir Frederico; Andrade,Luciano Rogério Braatz de; Nodari,Rubens Onofre.
Plant breeding efficiency relies mainly on genetic diversity and selection to release new cultivars. This study aimed to identify landraces with favorable characteristics that can be used as parents of segregating populations in common bean (Phaseolus vulgaris L.) breeding programs. Firstly, ten bean genotypes were selected because they showed promising agronomic performance, and the following seven adaptive traits of four commercial bean cultivars were evaluated: i) plant height; ii) diameter of the stem; iii) height of the insertion of the first pod; iv) pod number per plant; v) grain number per pod; vi) weight of a thousand grains and vii) grain yield. The accessions BAF 07, BAF 44, and BAF 45 are promising in terms of increasing plant height, and...
Tipo: Info:eu-repo/semantics/article
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162014000200005

NITROGÊNIO E POTÁSSIO NA FIXAÇÃO SIMBIÓTICA DE N2 POR SOJA CULTIVADA NO INVERNO
Provedor de dados: 63
Autores: Novo,Maria do Carmo de Salvo Soares; Tanaka,Roberto Tetsuo; Mascarenhas,Hipolito Assunção Antonio; Bortoletto,Nelson; Gallo,Paulo Boller; Pereira,José Carlos Vela Novo Alves; Vargas,Álvaro Augusto Teixeira.
O efeito do nitrogênio e do potássio sobre a nodulação, fixação simbiótica do nitrogênio, teor de N nos grãos e produtividade de soja, foi avaliado no inverno em experimentos conduzidos nas Estações Experimentais de Mococa, Ribeirão Preto e Votuporanga, do Instituto Agronômico de Campinas, SP, em solos podzólico vermelho-escuro, latossolo roxo e latossolo vermelho-escuro, respectivamente. Doses de nitrogênio na forma de uréia (0, 50 e 100 kg.ha-1 de N), de potássio na forma de cloreto de potássio (0, 30 e 60 kg.ha-1 de K2O) e cultivares de soja (IAC-8 e IAC-14), foram arranjados em fatorial e dispostos no campo, em blocos ao acaso, com três repetições. As sementes foram tratadas com inoculante comercial turfoso na dose de 8 g.kg-1 de semente. No...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nodulação; Produtividade; Cultivo de inverno.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000100021

Aggregation agents and structural stability in soils with different texture and organic carbon contents
Provedor de dados: 63
Autores: Carrizo,María Eugenia; Alesso,Carlos Agustín; Cosentino,Diego; Imhoff,Silvia.
The flat pampas in the state of Santa Fe in Argentina have soils with high silt content, variable carbon content, and diverse degrees of structural degradation. Aggregate stability has been used as an indicator of the structural condition of the soil. This study aimed to quantify the effect of the addition of crop residues and root activity on the agents of aggregation and mechanisms of aggregate breakdown in soils with different carbon contents and textures cultivated under no-till. An experimental trial was conducted on a loamy soil (Typic Hapludoll, Santa Isabel series) and a silty soil (Typic Argiudoll, Esperanza series) under controlled conditions for 112 days with the following treatments: (i) with and without wheat plant growth and (ii) with and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glomalin; Carbohydrates; Crop residues; Active roots.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162015000100075

Nitrogen source influences the antioxidative system of soybean plants under hypoxia and re-oxygenation
Provedor de dados: 63
Autores: Borella,Junior; Becker,Rafael; Lima,Milene Conceição; Oliveira,Denise dos Santos Colares de; Braga,Eugenia Jacira Bolacel; Oliveira,Ana Claudia Barneche de; Amarante,Luciano do.
ABSTRACT: In this work, we compared nitrate-supplied plants (non-nodulated) with non-nitrate-supplied plants (nodulated) under oxygen privation of root system (hypoxia) and re-oxygenation (post-hypoxia; recovery) in order to verify whether N sources affect the antioxidant system during oxidative stress caused by hypoxia and post-hypoxia conditions. Antioxidant enzymatic activities, ascorbate redox state, and reactive oxygen species (ROS) levels were analyzed in roots and leaves of two soybean genotypes, Fundacep 53 RR and BRS Macota at reproductive stage R2, during hypoxia and post-hypoxia in an experiment carried out in a hydroponic system. The antioxidant system was strongly induced in roots of nitrate-supplied plants of both genotypes, with high...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycine max; Waterlogging; Oxidative stress; Antioxidative enzymes.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162019000100051

Development and bloom in hybrids of wild passion fruit cultivated in different types of pots and shading levels
Provedor de dados: 63
Autores: Santos,Eileen Azevedo; Souza,Margarete Magalhães; Viana,Alexandre Pio; Almeida,Alex-Alan Furtado de; Araújo,Ioná Santos; Freitas,Jôsie Cloviane de Oliveira.
Ornamental hybrids of passion flowers are thoroughly diffused in many countries and used in the decoration of houses and gardens. However, the cultivation of ornamental passion fruits practically unexploited in Brazil. This study aimed at evaluating the growth and blooming of F1 hybrids of Passiflora L. (P. sublanceolata J.M. MacDougal [ex P. palmeri var. sublanceolata Killip] vs. P. foetida var. foetida L.) cultivated in ceramic and concrete pots under different shading levels. The vegetative and flower evaluations were carried out weekly, in clonal cuttings 60 days after rooting. The height, leaf length and width, the number of internodes and leaves and stem diameter were evaluated using a randomized complete design in a factorial scheme which...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Passion flower; Ornamental hybrids; Interspecific hybridizations; Light intensity; Morphological characteristics.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162012000200007

Development and silk production by silkworm larvae after topical application of methoprene
Provedor de dados: 63
Autores: Miranda,José Ednilson; Bortoli,Sérgio Antonio de; Takahashi,Roque.
Juvenile hormone analogues have been tested as insect growth regulators in silkworm (Bombyx mori), seeking an increment of silk production. These chemical products, when applied in small or moderate rates, promote the extension of the last larval instar. To understand the physiologic consequences on silk production by the silkworm strain C115 x N108, the application of methoprene, a juvenile hormone analogue, was performed to evaluate its effects on larval development and silk production. Methoprene was topically applied 48h after the fourth larval ecdysis, on the dorsal integument of the 2nd thoracic segment of the insects, at seven rates between 0 and 20 ng a.i. Methoprene influenced positively the duration of the fifth instar and the weight gain of the...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Bombyx mori; JHA; Sericulture; Juvenile hormone.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000300026

Partial substitution of fishmeal with soybean protein-based diets for dourado Salminus brasiliensis
Provedor de dados: 63
Autores: Correa,Roselany de Oliveira; Aguilar,Fredy Armando Aguilar; Cruz,Thaline Maira Pachelli da; Sabioni,Rafael Estevan; Cyrino,José Eurico Possebon.
ABSTRACT  Cost and environmental restrictions limit the use of fishmeal (FM) in aquafeeds and plant protein (PP) sources. Soybean by-products are important alternative; however, their antinutritional factors may reduce fish growth. This study evaluates the effect of FM substitution for PP (soybean meal and soy protein concentrate) in diets of dourado (Salminus brasiliensis), a promising species for fish farming and empirically considered highly tolerant to PP-based diets. A control diet was formulated to contain 20 % of fishmeal and 61 % of plant protein (SBM) and other five diets with decreasing FM graded levels (16 %, 12 %, 8 %, 4 %, 0 %), which were replaced by soybean protein concentrate (SPC), comprising six treatments and four replicates. Fifteen...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Enteritis; Aquaculture; Protein source; Gastrointestinal tract; Nutrition.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000200400

Longevity of africanized worker honey bees (Apis mellifera) carrying eye color mutant alleles
Provedor de dados: 63
Autores: Almeida,Rosana de; Soares,Ademilson Espencer Egea.
The dark coloration of insects eyes is attributed to the accumulation of the brown pigment insectorubin, a mixture of ommochromes, xanthommatin and several ommins, biosynthesized from tryptophan. When any of the events in the synthesis chain is interrupted, formation and accumulation of pigments other than insectorubin occurs, and a new eye color will appear. The aim of the present work is to evaluate the longevity of worker honey bees Apis mellifera, homozygous and heterozygous for the mutant alleles cream (cr), snow-laranja (s la) and brick (bk). Eye pigmentation and average longetivity of bees are very closely related. Mutant bees carrying lighter eye pigmentation are unable to return to the hive; there is, therefore, a close association between the eye...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Eyes; Mutants; Cream; Snow-laranja; Brick.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000200011

Modelo teórico e experimental da reciclagem do Carbono-13 em tecidos de mamíferos e aves
Provedor de dados: 63
Autores: Ducatti,Carlos; Carrijo,Alfredo Sampaio; Pezzato,Antônio Celso; Mancera,Paulo Fernando de Arruda.
A diferença entre fontes alimentares da ordem de 14‰, originárias de plantas com ciclos fotossintéticos Carbono-3 (C3) e Carbono-4 (C4) e seus subprodutos, abre novas perspectivas para o estudo do metabolismo do carbono em aves e animais de pequeno porte. Os autores propõem um modelo teórico e experimental capaz de exprimir os resultados de enriquecimento relativo, delta per mil (delta‰) da razão 13C/12C versus tempo em diferentes tecidos. Utilizou-se a equação y(t) = (y0 -- q/k) e-kt + q/k onde, y(t) é a concentração isotópica no tempo desejado, y0 a concentração isotópica inicial existente no tecido, k é uma constante de troca isotópica com unidade 1/tempo, t é unidade de tempo e q é a taxa de entrada de metabólitos que contém carbono, com valores de...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aves de postura; C3; Metabolismo nutricional; Delta13C; Modelo teórico-experimental.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000100003

Comparações entre as propriedades químicas de solos das regiões da floresta amazônica e do cerrado do Brasil Central
Provedor de dados: 63
Autores: Demattê,J.L.I.; Demattê,J.A.M.
Foi estudada uma série de propriedades dos solos das regiões Amazônica e de cerrado. Para a região de cerrado, selecionou-se 17 perfis do Triângulo Mineiro, 6 perfis da região de Goiás e 5 perfis do Sudeste de MT, todos publicados em boletins de solo da EMBRAPA, sendo a maioria latossolos. Na Amazônia, selecionaram-se dados dos Boletins do Projeto RADAM BRASIL, sendo 76 perfis ao todo, retirados desde a região do Pará até o Acre; destes, 38 são latossolos e 38 podzólicos vermelho amarelo (PVA). Para fins de comparação entre os solos as seguintes profundidades foram padronizadas: 0-10 cm; 10-40 cm; 40-80 cm; 80-100 cm. Não foi considerada a camada de serapilheira. Os solos da região do cerrado são mais intemperizados do que os da região Amazônica, havendo...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amazônia; Brasil Central; Cerrado; Propriedades químicas.
Ano: 1993
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161993000200016

Avaliação de mudas de maracujazeiro em função do substrato e do tipo de bandeja
Provedor de dados: 63
Autores: Oliveira,R.P. de; Scivittaro,W.B.; Vasconcellos,L.A.B.C. de.
A utilização de bandejas de isopor na produção de mudas de hortaliças e frutíferas vem aumentando em nosso pais, devido às vantagens que esse método apresenta: economia de substrato e de área de viveiro, menor custo no controle de pragas e doenças, produção de mudas de alta qualidade e alto índice de pegamento após o transplante. No caso do maracujazeiro (Passiflora edulis var. flavicarpa), o transplante de mudas é uma prática bastante utilizada para sua propagação. A ocorrência de traumatismos na raiz durante esta fase é significativa, influindo negativamente no desenvolvimento posterior das mudas. O presente trabalho objetivou avaliar a produção de mudas de maracujá em bandejas de isopor, comparando a eficiência de quatro substratos diferentes e dois...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Maracujá; Passiflora edulis var.flavicarpa; Propagação.
Ano: 1993
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161993000200014

Economic evaluation of cereal cropping systems under semiarid conditions: minimum input, organic and conventional
Provedor de dados: 63
Autores: Pardo,Gabriel; Aibar,Joaquín; Cavero,José; Zaragoza,Carlos.
Cropping systems like organic farming, selling products at a higher price and promoting environmental sustainability by reducing fertilizer and pesticides, can be more profitable than conventional systems. An economic evaluation of three cropping systems in a seven year period experiment was performed, using a common rotation (fallow-barley-vetch-durum wheat) in a semi-arid rainfed field of Spain. The minimum input system included mouldboard ploughing, cultivator preparation, sowing and harvest. The conventional system involved mineral fertilizer and herbicide treatments, while the organic system involved composted manure and mechanical weed control. The resulting economic margins were highest with the minimum input system, followed by the organic and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Profitability; Organic agriculture; Crop rotation.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000500005

Screening of Passiflora species for reaction to Cowpea aphid-borne mosaic virus reveals an immune wild species
Provedor de dados: 63
Autores: Maciel,Scheila da Conceição; Nakano,Daniel Hiroshi; Rezende,Jorge Alberto Marques; Vieira,Maria Lúcia Carneiro.
Cowpea aphid-borne mosaic virus (CABMV) is a potyvirus that causes the most serious virus disease of passion fruit crops in Brazil. It is transmitted by several species of aphids in a non-persistent, non-circulative manner. The reaction of 16 species of Passiflora to infection by mechanical inoculation with four Brazilian isolates of CABMV was evaluated under greenhouse conditions. Only P. suberosa, a wild species, was resistant to infection by all virus isolates, in two independent assays. P. suberosa grafted onto infected P. edulis f. flavicarpa did not develop symptoms; neither was the virus detected by RT-PCR in the upper leaves, suggesting that this species is immune to CABMV.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Passifloraceae; Potyvirus; Resistance.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000300018

Efeito de adubos potássicos na produção de soja
Provedor de dados: 63
Autores: Mascarenhas,H.A.A.; Tanaka,R.T.; Pereira,J.C.V.N.A.; Gallo,P.B.; Bataglia,O.C.
Um experimento de adubos potássicos (KC1, K2SO4, K-Mag e vinhaça) foi conduzido durante três anos agrícolas em quatro classes de solo: Podzólico Vermelho Amarelo Orto (PV), Latossolo Roxo distrófico (LR), Latossolo Vermelho Escuro textura média (LE) e Latossolo Vermelho Amarelo textura média (LV). Os três primeiros adubos foram aplicados somente no primeiro cultivo da soja na dose de 150kg/ha de K2O a lanço e incorporados, enquanto a vinhaça foi aplicada anualmente na dose de 50.000 l/ha, um pouco antes de semeadura da soja. Os resultados mostraram que os cultivos sucessivos diminuíram gradativamente os teores de potássio tanto no solo como nas folhas. No segundo ano de cultivo em LV houve respostas positivas da cultura da soja ao uso de potássio, enquanto...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soja; Cloreto de potássio; Sulfato de potássio; K-Mag; Vinhaça.
Ano: 1994
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000100013

Potential of eleven Eucalyptus species for the production of essential oils
Provedor de dados: 63
Autores: Silva,Paulo Henrique Müller da; Brito,José Otávio; Silva Junior,Francides Gomes da.
Most Eucalyptus plantations in Brazil aim the production of paper and charcoal, but the use of the species for lumbering, construction and extraction of essential oil has increased. Eleven species of Eucalyptus were assessed in regard to their essential oil production potential, nine never used before for commercial, essential oil extraction. Assessements were compared with Eucalyptus citriodora and Eucalyptus globulus, already explored in oil production for perfume and medical purposes, aiming to increase the availability of commercial species and the relationship between oil production and climatic conditions. Eucalyptus leaves were seasonally sampled (three months interval) for distillation and determination of productivity and chemical composition of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Eucalyptus spp. essential oil; Yield climatic influence.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000100014

Carcass traits and meat quality of Brangus × Zebu steers in grazing systems receiving supplementation
Provedor de dados: 63
Autores: Valle,Felipe Roberto Amaral Ferreira do; Fontes,Carlos Augusto de Alencar; Fernandes,Alberto Magno; Oliveira,Tadeu Silva de; Processi,Elizabeth Fonseca.
ABSTRACT: The use of supplements eliminates deficiencies imposed by pasture, increases weight gain in animals and maximizes profits from the activity. The objective of this study was to evaluate the performance, carcass traits and meat quality of steers in grazing systems that received or did not receive a protein energy supplement at the level of 0.6 % body weight. The experiment lasted 160 days and included 36 Brangus × Zebu animals. Eighteen animals received supplementation and another eighteen did not receive supplementation. Carcasses were evaluated for yield, loin eye area, fat thickness and length. The assessment of meat quality evaluated the shear force, myofibril fragmentation index, color, exudative losses and collagen. The carcass traits of the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Crossing; Muscle deposition; Efficiency of use.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000300402

Distribuição do sistema radicular de uma cultura de aveia forrageira
Provedor de dados: 63
Autores: Fante Jr.,Lorival; Reichardt,Klaus; Jorge,Lucio André de Castro; Bacchi,Osny Oliveira Santos.
Avaliou-se a distribuição das raízes de uma aveia forrageira através da aplicação dos métodos do anel volumétrico, da placa com pregos, do trado e do auxiliado por processamento de imagens. A aveia forrageira foi cultivada em latossolo vermelho-escuro, sob dois tratamentos distintos em função da manutenção da capacidade de água disponível no solo (CAD): tratamento 1 - 50% da CAD; tratamento 2 - 80% da CAD. Foram realizadas 3 amostragens, aos 25, 60 e 115 dias após a emergência. As raízes da aveia forrageira concentraram-se nas camadas iniciais do solo, cerca de 90% entre 0 a 20 cm. Os resultados encontrados para a quantificação das raízes variaram com o tratamento, a metodologia e a época de amostragem. Verificou-se a existência de correlações entre os...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aveia forrageira; Sistema radicular; Processamento de imagem; Água do solo.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000500010

How can dairies maximize their profits and properly remunerate their dairy farmers?
Provedor de dados: 63
Autores: Meneghini,Rafael Cedric Möller; Cassoli,Laerte Dagher; Martines Filho,João Gomes; Xavier,Carlos Eduardo Osório; Santos,Marcos Veiga dos; Caixeta Filho,José Vicente; Natel,Andressa Santanna; Machado,Paulo Fernando.
ABSTRACT The current pricing process of raw milk in Brazil discourages producers from improving milk composition, which affects both yield and quality of dairy products. Furthermore, small and medium-sized dairies face great difficulties when it comes to planning production. Thus, a linear programming model was developed to price the raw milk and determine the optimal mix (combination of quantities) of dairy products that maximizes total contribution margin (TCM) under daily scenarios of high (January) and low (July) raw milk supplies (summer and winter, respectively) by comparing optimal solutions with actual results. The TCM of optimal and actual mixes were higher in January due to the greater availability of raw material. Packaging was a limiting factor...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Contribution margin; Dairy products; Linear programming; Milk components; Milk pricing.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000100051

Rootstocks for 'Tahiti' lime
Provedor de dados: 63
Autores: Stenzel,Neusa Maria Colauto; Neves,Carmen Silvia Vieira Janeiro.
The 'Tahiti' lime (Citrus latifolia Tanaka) is an important commercial citrus cultivar in Brazil. 'Rangpur' lime has being used as its main rootstock, but it is susceptible to root rot caused by Phytophthora, reducing tree longevity. An experiment was set up in a randomized block design, with three trees per plot of each rootstock and four replicates, and run for 12 years, aiming to compare the performance of 'IAC-5 Tahiti' lime, budded on 'Rangpur' lime (Citrus limonia Osb.); 'C-13' citrange (Citrus sinensis (L.) Osb. × Poncirus trifoliata (L.) Raf.); 'African' rough lemon (Citrus jambhiri Lush.); 'Volkamer' lemon (Citrus volkameriana Ten. &amp;amp; Pasq.); trifoliate orange (Poncirus trifoliata (L.) Raf.); 'Sunki' mandarin (Citrus sunki Hort. ex Tan.)...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Citrus latifolia; 'Rangpur' lime; 'Volkamer' lemon; Trifoliate orange; Citrange.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000200005

Tillering does not interfere on white oat grain yield response to plant density
Provedor de dados: 63
Autores: Almeida,Milton Luiz de; Sangoi,Luís; Ender,Márcio; Wamser,Anderson Fernando.
Plant density is one of the cropping practices that has the largest impact on individual plant growth. This work was conducted to evaluate the response of white oat (Avena sativa) cultivars with contrasting tillering patterns to variations in plant density. Two field experiments were carried out in Lages, SC, Brazil, during the 1998 and 1999 growing seasons. A split plot experimental design was used. Four oat cultivars were tested in the main plots: UFRGS 14, UFRGS 18, UPF 16 and UPF 17 using five plant densities split plots: 50, 185, 320, 455 and 550 plants m-2. Five plant samples were taken 25, 34, 48, 58 and 70 days after plant emergence to assess the treatment effects on dry matter partition between main stem and tillers. UFRGS 18 promoted dry matter...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dry mass accumulation; Yield components; Cultivars.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000200008

Laboratory rearing technique of Mahanarva fimbriolata (Stål) (Hemiptera: Cercopidae)
Provedor de dados: 63
Autores: Garcia,José Francisco; Botelho,Paulo Sérgio Machado; Parra,José Roberto Postali.
Due to the importance of cercopids as pests in sugarcane and forage grass, researches have been conducted in order to address aspects related to the bioecology and control of these insects. The objective of this study was to develop a rearing technique for Mahanarva fimbriolata (Stål) (Hemiptera: Cercopidae) on sugarcane, in the laboratory (25 ± 1ºC; 70 ± 10% RH; and 14-hour photophase). Adults were isolated in cylindrical cages containing one sugarcane plant, with a moistened cotton disc surrounding the base of the plant as a site for oviposition. Eggs were removed from the cotton disc by washing it in running water over sieves and maintained in Petri dishes on moistened filter paper until the nymphs hatched. The newly hatched nymphs were transferred to...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Root froghopper; Sugarcane.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000100011

Origin of microaggregates in soils with ferralic horizons
Provedor de dados: 63
Autores: Cooper,Miguel; Vidal-Torrado,Pablo; Chaplot,Vincent.
Microaggregates that characterize ferralic soils have been hypothesized to have physical, geochemical and/or biological origins. Despite of many studies, the hierarchy between these processes that form microaggregates has seldom been reported. The objective of this work was to study the genesis of microaggregates in a sequence of Ferralic Nitisols developed on Quaternary red clayey sediments and diabase in Piracicaba (SP), Brazil. This issue was tackled by combining optical microscopy, image analysis, scanning electron microscopy and elemental iron quantifications by X-ray fluorescence. Micromorphological investigations showed three different types of microaggregates: (i) oval microaggregates with well sorted quartz grains in their interior; (ii) oval...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nitisol; Soil genesis; Micromorphology; Scanning electron microscopy.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000300009

Nutrição mineral de seringueira. XII. Absorção de macro e micronutrientes nos primeiros 240 dias
Provedor de dados: 63
Autores: Viégas,I.de J.M.; Haag,H.P.; Bueno,N.; Pereira,J.da P.
Com o objetivo de obter informações referentes ao crescimento, concentração e conteúdo de macronutrientes e micronutrientes em plantas de seringueira, foram coletadas amostras de folhas, caule e raízes aos 60, 120, 180 e 240 dias de idade em condições de casa de vegetação. Os resultados obtidos mostraram que: o maior incremento do crescimento ocorreu a partir dos 180 dias; as maiores concentrações de nutrientes exceto para o ferro ocorreram nas folhas; a extração de nutrientes por hectare, nos 240 dias foi o seguinte: N = 60,0kg, P = 12kg, K = 27,74kg, Ca = 8,97kg, Mg = 5,32kg, S = 6,21kg, B = 45,52g, Fe = 544g, Mn = 337,74g e Zn = 77,30g.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Seringueira; Nutrição mineral; Macronutrientes; Micronutrientes.
Ano: 1992
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161992000400008

Evapotranspiration mapping of commercial corn fields in Brazil using SAFER algorithm
Provedor de dados: 63
Autores: Venancio,Luan Peroni; Mantovani,Everardo Chartuni; Amaral,Cibele Hummel do; Neale,Christopher Michael Usher; Filgueiras,Roberto; Gonçalves,Ivo Zution; Cunha,Fernando França da.
ABSTRACT SAFER (Simple Algorithm for Evapotranspiration Retrieving) is a relatively new algorithm applied successfully to estimate actual crop evapotranspiration (ET) at different spatial scales of different crops in Brazil. However, its use for monitoring irrigated crops is scarce and needs further investigation. This study assessed the performance of SAFER to estimate ET of irrigated corn in a Brazilian semiarid region. The study was conducted in São Desidério, Bahia State, Brazil, in corn-cropped areas in no-tillage systems and irrigated by central pivots. SAFER algorithm with original regression coefficients (a = 1.8 and b = –0.008) was initially tested during the growing seasons of 2014, 2015, and 2016. SAFER performed very poorly for estimating corn...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Landsat; Water consumption; Maize; Remote sensing.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000400102

A brief review of soil water, solute transport and regionalized variable analysis
Provedor de dados: 63
Autores: Nielsen,D.R.; Hopmans,J.W.; Kutílek,M.; Wendroth,O.
We initially review basic concepts of the forces acting on soil water, soil water potential and soil water retention, and equations to describe soil water movement under water-saturated and unsaturated conditions. Processes of infiltration, evaporation and redistribution of water will be presented for simple initial and boundary conditions occurring within homogeneous soil columns. Next we consider the physical, chemical and biological processes within a soil profile that distribute, dilute or concentrate solute species within the liquid phase of a soil The relative concentration of solutes in the liquid phase governs not only the retention and transport of water within soils but also contributes to our understanding of managing the quality of water within...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Solute transport; Regionalized variable.
Ano: 1997
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161997000300012

Carbon losses and soil property changes in ferralic Nitisols from Cuba under different coverages
Provedor de dados: 63
Autores: Hernández-Jiménez,Alberto; Vargas-Blandino,Dania; Bojórquez-Serrano,José Irán; García-Paredes,Juan Diego; Madueño-Molina,Alberto; Morales-Díaz,Marisol.
ABSTRACT The transformation of primary forestlands into lands under cultivation exerts an impact on the physical and chemical properties of the soils, leading to loss of carbon from the soil. The aims of this study were (1) to estimate the impact of different land use on organic carbon stock (OC-stock) and (2) to determine the clay percentage, the dispersion factor, and bulk density with regard to soil management. Thirty soil profiles were sampled as follows: four under primary forests with 80-100 years (old growth); two under secondary wood forests with 45-50 years; eight under secondary young forests with 15-25 years; four under pasture land with 15-20 years; and 12 under continuous cultivation for &gt; 50 years. We determined the changes in OC-stock in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Degradation; Carbon reserves; Physical properties; Tropical soils.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162017000400311

Seed germination and seedling development of white oat affected by silicon and phosphorus fertilization
Provedor de dados: 63
Autores: Toledo,Mariana Zampar; Garcia,Rodrigo Arroyo; Merlin,Alexandre; Fernandes,Dirceu Maximino.
Silicon (Si) fertilizers have been increasingly used in agriculture due to several benefits as acidity correction in tropical soils and positive effects on the development of grasses. Nutrient availability and plant nutrition play an important role in seed production and may affect the physiological quality of white oat seeds. The present study had as objective to evaluate seed germination and seedling development of white oat (Avena sativa L.) affected by silicon and phosphorus fertilization. The experimental design was the completely randomized, analyzed as a factorial 2 x 4, with six replications. Treatments consisted of 20 and 200 mg dm-3 of P2O5, applied as triple superphosphate, combined with 0, 150, 300 and 450 mg dm-3 of Si, as potassium silicate....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Avena sativa L; Germination; Vigor; Plant nutrition.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000100003

RESPOSTA DA APLICAÇÃO DE MICRONUTRIENTES NO CULTIVO DE FEIJÃO IRRIGADO NO INVERNO
Provedor de dados: 63
Autores: AMBROSANO,E.J.; WUTKE,E.B.; AMBROSANO,G.M.B.; BULISANI,E.A.; BORTOLETTO,N.; MARTINS,A.L.M.; PEREIRA,J.C.V.N.A.; SORDI,G. de.
Ensaios em campo, sob irrigação por aspersão, foram conduzidos nos municípios de Ribeirão Preto, Votuporanga (1990, 1991) e Pindorama (1992, 1993), em São Paulo, nos solos latossolo roxo, latossolo vermelho-escuro fase arenosa e podzolizado de Lins e Marília, var-Marília, respectivamente, no período de maio a agosto, visando estudar o efeito da aplicação de micronutrientes, via solo e foliar, no rendimento do feijoeiro cultivar IAC-Carioca. Os tratamentos foram avaliados em delineamento de blocos casualizados com cinco repetições. Os tratamentos aplicados ao solo constaram de: testemunha com adubação básica e sem adição de micronutrientes; testemunha sem adubação básica e sem adição de micronutrientes; 20 kg ha-1 de borogram (8% B); 20 kg ha-1 de zincogram...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Feijão; Phaseolus vulgaris L.; Micronutrientes; Irrigação.
Ano: 1996
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161996000200014

Seed health of common bean stored at constant moisture and temperature
Provedor de dados: 63
Autores: Francisco,Fabiana Gonçalves; Usberti,Roberto.
Fungal incidence in stored common bean (Phaseolus vulgaris L.) is the main concern in order to preserve seed health and viability. The main aim of this study was to analyse these quality parameters in hermetically stored seeds at 10.2, 13.1, 16.2, 18.5% moisture content (MC) and 25, 30, 35, 40°C, through seed germination and health tests. Water activity recorded at 10.2 and 18.5% MC were 0.448 and 0.700, respectively. Low seed moisture content reduced Alternaria spp. incidence at 25-30°C. Highest incidence of Fusarium spp. (7.5%) occurred at 16.2% MC and 35-40°C. Highest incidences of Rhizoctonia spp. (8-10%) were recorded at 16.2-18.5% MC and 30-40°C. Penicillium spp. and Aspergillus spp. were predominant throughout the experiment and the highest...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Seed healthiness; Hermetic storage; Fungal incidences.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000600007

State-space approach for the analysis of soil water content and temperature in a sugarcane crop
Provedor de dados: 63
Autores: Dourado-Neto,Durval; Timm,Luís Carlos; Oliveira,Julio Cesar Martins de; Reichardt,Klaus; Bacchi,Osny Oliveira Santos; Tominaga,Tania Toyomi; Cássaro,Fabio Augusto Meira.
The state-space approach is used to describe surface soil water content and temperature behaviour, in a field experiment in which sugarcane is submitted to different management practices. The treatments consisted of harvest trash mulching, bare soil, and burned trash, all three in a ratoon crop, after first cane harvest. One transect of 84 points was sampled, meter by meter, covering all treatments and borders. The state-space approach is described in detail and the results show that soil water contents measured along the transect could successfully be estimated from water content and temperature observations made at the first neighbour.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil water; Soil temperature; State-space; Transect.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000500025

Controlling ammonia losses during manure composting with the addition of phosphogypsum and simple superphosphate
Provedor de dados: 63
Autores: Prochnow,L.I.; Kiehl,J.C.; Pismel,F.S.; Corrente,J.E.
With the purpose of evaluating the effectiveness of phosphogypsum and simple superphosphate in controlling ammonia losses by volatilization during the process of manure composting, an experiment was carried out in closed flasks of 1.6 liter, in which different rates (50, 100, 150 and 200 kg.t-1) of phosphogypsum and simple superphosphate were mixed with a substrate composed of equal amounts (on weight basis) of fresh chicken manure and cattle manure. Ammonia lost by volatilization was determined after 7, 14, 21, 28 and 35 days by trapping the gas in sulfuric acid solution placed in a small glass vial which, in turn, was maintained inside the volatilization flask The remaining acid after the exposure to ammonia was determined by titration with 0.025N NaOH....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ammonia losses; Phosphogypsum; Simple superphosphate; Manure composting.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000200024

Dietary net energy mainly affects growth performance and pork quality of finishing pigs
Provedor de dados: 63
Autores: Moreira,Camila de Araújo; Bonagúrio,Lucas Pimentel; Esteves,Lucas Antonio Costa; Sitanaka,Natália Yoko; Pozza,Paulo Cesar.
ABSTRACT The present study was carried out to evaluate the effect of net energy levels in diets for barrows, from 70 to 100 kg, on performance, plasma parameters and carcass characteristics. Two experiments were carried out: in the first (Experiment I), a metabolism assay was carried out to estimate the net energy (NE) of experimental diets. Twelve crossbred barrows, averaging 85.74 ± 6.80 kg initial body weight, were distributed in a randomized block design with two metabolizable energy (ME) levels (3100 and 3500 kcal kg–1) with six replicates and one animal per experimental unit. In the second (Experiment II), 45 castrated male pigs were used, averaging 70.10 ± 1.26 kg of initial body weight distributed in a randomized block design, with five NE levels...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Body weight gain; Prediction equation; Energy requirement for production; Qualitative parameters of meat pigs.
Ano: 2022
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162022000100401

Rooting stimulation in muscadine grape cuttings
Provedor de dados: 63
Autores: Castro,P.R.C.; Melotto,E.; Soares,F.C.; Passos,I.R.S.; Pommer,C.V.
The muscadine grape (Vitis rotundifolia Michx.) is native to Florida and has been cultivated for many years in U.S.A. It is harvested as single berries instead of in bunches and has small leaves. The fruit skin is thicker than those of bunch-type grapes. One reason for its popularity is that the muscadine is seldom seriously affected by diseases or insects. The muscadine grape is not readily propagated by hardwood cuttings, therefore the present work was carried out to develop a method for commercial propagation of its cuttings, using treatments with growth regulators (auxins) and low temperature. The results showed that the rooting of both basal and middle shoots of muscadine grape is better than the rooting of terminal sections of the shoots. Cuttings...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vitis rotundifolia Michx.; Cutting; Growth regulators.
Ano: 1994
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000300009

Reflectância espectral e mineralogia de materiais formados sobre diabásio
Provedor de dados: 63
Autores: Clemente,Celso Augusto; Demattê,José Alexandre Melo; Mafra,Álvaro Luiz; Bentivenha,Sérgio Ricardo Portes.
O presente estudo teve por objetivo caracterizar diferentes fases de intemperismo de um solo e relacioná-las com seu comportamento espectral. Um perfil pedológico desenvolvido sobre diabásio da região de Capivari-SP, foi descrito morfologicamente, identificando-se seis fases de alteração. Os atributos analisados foram granulometria, composição química e mineralógica. A reflectância espectral do solo foi avaliada em laboratório através de espectrorradiômetro na faixa de 300 a 2500 nm. O perfil apresentou grau de intemperismo moderado, o que foi evidenciado pela alta relação silte/argila observada abaixo do horizonte Bi. Os horizontes subsuperficiais também apresentaram alto teor de nutrientes, especialmente P, Ca e Mg, que estavam relacionados com a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Caulinita; Reflectância espectral; Gibbsita; Rocha básica; Vermiculita-esmectita.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000100026

Laranjeiras 'Valência' enxertadas em híbridos de trifoliata
Provedor de dados: 63
Autores: Pompeu Jr.,Jorgino; Laranjeira,Francisco Ferraz; Blumer,Silvia.
O limão Cravo é o principal porta-enxerto da citricultura paulista. Sua suscetibilidade ao declínio dos citros e à gomose de Phytophthora reduz a produtividade, onera os tratos culturais e as colheitas e encurta a vida útil dos pomares. É necessário selecionar outros porta-enxertos tolerantes ou resistentes aos fatores bióticos e abióticos limitantes à citricultura paulista. Procuram-se também porta-enxertos nanicantes visando maior produtividade por área, aumento da eficiência e redução nos custos das inspeções e dos controles de pragas e doenças e nas colheitas. Os estudos vem se concentrando na seleção de clones e de híbridos de trifoliata. Laranjeiras 'Valência' enxertadas em híbridos de trifoliata produzidos no USDA foram plantadas em 1986 em...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Porta-enxertos; Tetraplóides; Citrandarins; Citranges; Citradia.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000100014

Ação de produtos químicos in vitro e in vivo sobre Clavibacter michiganensis subsp. michiganensis, agente causal do cancro bacteriano do tomateiro
Provedor de dados: 63
Autores: Theodoro,Gustavo de Faria; Maringoni,Antonio Carlos.
O presente trabalho teve como objetivo avaliar a sensibilidade in vitro e in vivo de um isolado de Clavibacter michiganensis subsp. michiganensis (Cmm) aos produtos cloridrato de kasugamicina, fulusulfamide e oxitetraciclina. Para o teste in vitro, foram avaliados os halos de inibição formados ao redor de discos de papel de filtro umedecidos com os produtos, nas concentrações de 0, 1, 10, 100 e 1000 mig mL-1, 24 h após a instalação do ensaio. Quanto à avaliação dos produtos in vivo, dois ensaios foram instalados sob condições de casa-de-vegetação, com plantas de tomateiro cultivar Ângela Hiper, através da inoculação das plantas por dois métodos: pulverização foliar e ferimento no caule. Nos dois ensaios, as plantas foram pulverizadas com os produtos...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Tomate; Doença; Controle químico.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000300011

A vector carrying the GFP gene (Green fluorescent protein) as a yeast marker for fermentation processes
Provedor de dados: 63
Autores: Gomes,Luiz Humberto; Duarte,Keila Maria Roncato; Andrino,Felipe Gabriel; Giacomelli,Ana Maria Brancalion; Tavares,Flavio Cesar Almeida.
Contaminant yeasts spoil pure culture fermentations and cause great losses in quality and product yields. They can be detected by a variety of methods although none being so efficient for early detection of contaminant yeast cells that appear at low frequency. Pure cultures bearing genetic markers can ease the direct identification of cells and colonies among contaminants. Fast and easy detection are desired and morphological markers would even help the direct visualization of marked pure cultures among contaminants. The GFP gene for green fluorescent protein of Aquorea victoria, proved to be a very efficient marker to visualize transformed cells in mixed populations and tissues. To test this marker in the study of contaminated yeast fermentations, the GFP...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Saccharomyces cerevisiae; GFP (green fluorescent protein); Fermentative processes.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000400018

Texture and organic carbon contents do not impact amount of carbon protected in Malagasy soils
Provedor de dados: 63
Autores: Razafimbelo,Tantely; Chevallier,Tiphaine; Albrecht,Alain; Chapuis-Lardy,Lydie; Rakotondrasolo,Fela Nirina; Michellon,Roger; Rabeharisoa,Lilia; Bernoux,Martial.
Soil organic carbon (SOC) is usually said to be well correlated with soil texture and soil aggregation. These relations generally suggest a physical and physicochemical protection of SOC within soil aggregates and on soil fine particles, respectively. Because there are few experimental evidences of these relations on tropical soils, we tested the relations of soil variables (SOC and soil aggregate contents, and soil texture) with the amount of SOC physically protected in aggregates on a set of 15 Malagasy soils. The soil texture, the SOC and water stable macroaggregate (MA) contents and the amount of SOC physically protected inside aggregates, calculated as the difference of C mineralized by crushed and intact aggregates, were characterized. The relation...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Macroaggregate; Tropical soils; Soil structure; Carbon stabilization.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162013000300009

Uso de análise física para estimar a composição química em ingredientes para rações
Provedor de dados: 63
Autores: Passos Jr,H.da S.; Bose,M.L.V.
Procurou-se verificar se a medida física "densidade aparente" poderia ser utilizada como parâmetro capaz de analizar a composição química bromatológica dos farelos de algodão 40% (FA), de soja (FS) e de arroz cru (FAr), provenientes de diversas regiões do país. Os tratamentos consistiram na adição das respectivas cascas de farelo aos níveis de 0, 10, 20, 30, 40, 50 e 100, simulando fraudes em delineamento inteiramente casualizado. As análises foram efetuadas no laboratório da Purina Nutrimentos Ltda, em Paulínea. Avaliou-se o efeito da adição crescente da casca sobre os valores de densidade, e desta sobre a composição em umidade (U), proteína bruta (PB), extrato etéreo (EE), fibra bruta (FB) e matéria mineral (MM). As amostras foram analisadas...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Farelo de algodão; Farelo de soja; Farelo de arroz; Densidade aparente; Análise química bromatológica; Análise física de alimento.
Ano: 1992
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161992000400021

Genetic structure and diversity of a soybean germplasm considering biological nitrogen fixation and protein content
Provedor de dados: 63
Autores: Torres,Adalgisa Ribeiro; Grunvald,Anna Karolina; Martins,Talita Busulini; Santos,Maria Aparecida dos; Lemos,Noélle Giacomini; Silva,Luis Antônio Stabile; Hungria,Mariangela.
Biological nitrogen fixation (BNF) has global economic and environmental importance, but has often not been considered in soybean [Glycine max (L.) Merrill] breeding programs. Knowing the genetic diversity and structure of a population within a germoplasm represent a key step for breeding programs. This study aimed at determining the structure of the population and diversity of soybean with regard to BNF and protein content in grain. In total, 191 accessions were evaluated, including 171 commercial soybean cultivars, developed and released by public institutions and private companies in Brazil, and 20 ancestral lines. The genotypes were chosen to represent four genetic groups: 128 Brazilian public genotypes, 20 exotic, and 43 genotypes from private...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: BNF; Bradyrhizobium; Glycine max; SSR markers; Symbiosis.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162015000100047

Capacidade de combinação e heterose para resistência a Puccinia polysora Underw. em milho
Provedor de dados: 63
Autores: Silva,Herberte Pereira da; Barbosa,Mauricio Pires Machado; Nass,Luciano Lourenço; Camargo,Luis Eduardo Aranha.
A resistência genética é o método mais eficiente de controle das doenças foliares da cultura do milho. Para avaliar a capacidade específica e geral de combinação (CEC e CGC, respectivamente) e heterose para resistência a Puccinia polysora, nove linhagens e seus 36 híbridos F1 foram utilizados em experimentos conduzidos em três ambientes. A severidade da doença foi avaliada na planta inteira (PI) e na folha posicionada no ponto de inserção da espiga principal (AFA). O delineamento experimental utilizado foi em blocos casualizados com três repetições e a parcela experimental foi representada por uma fileira de 5 m de comprimento. A análise da variância para as reações a ferrugem polissora foram feitas usando a análise II do método de Gardner &amp;amp;...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Análise dialélica; Ferrugem polissora; Resistência a doença; Melhoramento vegetal.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000400020

Desempenho de ovinos e respostas de pastagens de tifton 85 (Cynodon spp.) sob lotação contínua
Provedor de dados: 63
Autores: Carnevalli,Roberta Aparecida; Silva,Sila Carneiro da; Fagundes,Jaílson Lara; Sbrissia,André Fischer; Carvalho,Carlos Augusto Brandão de; Pinto,Luiz Felipe de Moura; Pedreira,Carlos Guilherme Silveira.
A utilização de pastagem como principal fonte de alimento para ruminantes vem crescendo nos últimos tempos devido a seu baixo custo de produção. Nesse sentido, plantas forrageiras que apresentem bom desempenho quando submetidas a pastejo e possuam flexibilidade de uso têm despertado grande interesse. Nesse contexto, foram avaliados o desempenho de ovinos e as características de pastagens de Tifton 85. Os pastos foram mantidos sob quatro intensidades de pastejo (tratamentos) correspondentes às alturas de 50, 100, 150 e 200 mm por ovinos em regime de lotação contínua com carga variável no período de agosto/1998 a abril/1999. Os dados foram reunidos por estação do ano (primavera e verão). Os tratamentos foram alocados às unidades experimentais aleatoriamente...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Valor nutritivo; Produção de forragem; Composição morfológica; Simulação de pastejo.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000100002

Climatic risk for potato late blight in the Andes region of Venezuela
Provedor de dados: 63
Autores: Garcia,Beatriz Ibet Lozada; Sentelhas,Paulo Cesar; Tapia,Luciano Roberto; Sparovek,Gerd.
Potato is an important crop for Venezuelan agriculture. However, its production is highly affected by late blight (Phytophtora infestans), since weather is commonly favorable for this disease. The aim of this study was to determine the sowing dates of low climatic risk for potato late blight in the Andes region of Venezuela, with an agrometeorological disease model and geographical information system (GIS) tools. The disease model used in this study was developed by Hyre (1954) which requires daily rainfall and temperature data which were obtained from 106 weather stations, located at the States of Mérida, Táchira, and Trujillo, for a period of 31 years. Hyre's model was applied for all stations obtainig the following variables: number of disease favorable...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phytophtora infestans; Hyre's model; Temperature; Rainfall.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000700007

Gamma-ray beam attenuation as an auxiliary technique for the evaluation of the soil water retention curve
Provedor de dados: 63
Autores: BACCHI,O.O.S.; REICHARDT,K.; OLIVEIRA,J.C.M.; NIELSEN,D.R.
The soil water retention curve is fundamental for the hydraulic characterization of a soil and has many applications in agricultural research as well as in practical agriculture. A new procedure for soil moisture and soil bulk density evaluation inside closed pressure chambers through gamma-ray beam attenuation is presented. The proposed procedure presents several advantages in relation to the traditional process: avoids the need of continuous sample manipulation; minimizes the problem of hysteresis; allows a more precise evaluation of soil moisture by taking into account changes of soil bulk density due to swelling or shrinking on addition or removal of water; allows frequent evaluation of soil moisture without the need of opening the pressure chamber;...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gamma attenuation; Gamma radiation; Soil water retention.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000300019

Sowing seasons and quality of soybean seeds
Provedor de dados: 63
Autores: Ávila,Marizangela Rizzatti; Braccini,Alessandro de Lucca e; Motta,Ivo de Sá; Scapim,Carlos Alberto; Braccini,Maria do Carmo Lana.
Considering the difficulties of producing high quality soybean [Glycine max (L.) Merrill] seeds during the traditional cropping period in some areas of the State of Paraná, Brazil, a research project was carried out with the objective of evaluating the influence of sowing dates on the physiological and sanitary quality of seeds, during the 1998/99 and 1999/00 cropping seasons, in Maringá, PR, Brazil. The experiment consisted of five cultivar competition assays, arranged in a completely randomized block design, with each assay sown at different dates (10/15, 10/30, 11/15, 11/30 and 12/15) for each cropping season. The evaluated cultivars were BRS 132 (early), BRS 133 (semi-early), BR 16 (semi-early), BRS 134 (intermediate) and FT- Estrela (late). Seeds...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cropping; Cultivar; Germination; Health.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000200007

Sementes de feijão submetidas a ciclos e períodos de hidratação-secagem
Provedor de dados: 63
Autores: Aragão,Carlos Alberto; Dantas,Bárbara França; Alves,Elza; Corrêa,Marcelo Rocha.
A técnica de hidratação-secagem pode ocasionar alterações fisiológicas e bioquímicas em sementes de feijão e afetar sua qualidade fisiológica. Sementes do cultivar Carioca foram submetidas a tratamentos de hidratação-secagem por 6, 12 e 24 horas com três ciclos de hidratação, com o objetivo de avaliar os efeitos causados por períodos e ciclos de hidratação-secagem na qualidade fisiológica das sementes. O delineamento experimental utilizado foi inteiramente casualizado, com quatro repetições, analisado estatisticamente em esquema fatorial 3 x 3 com uma testemunha absoluta. Para a primeira contagem da germinação, os tratamentos de períodos combinados com ciclos de hidratação-secagem, apresentaram superioridade em relação ao tratamento testemunha. Na...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Condicionamento fisiológico; Sementes; Proteínas.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000100013

Low temperature storage of NAA, GA3 and 2,4-D treated citrus budsticks
Provedor de dados: 63
Autores: Salomão,Luiz Carlos Chamhum; Siqueira,Dalmo Lopes de; Lima,Sebastião Fernando Ferreira; Cecon,Paulo Roberto; Dias,José Maria Moreira; Maia,Victor Martins.
Cold storage allows citrus budstick conservation for several months, although gradual bud viability loss and abscission of leaf petioles is observed. This study aimed to maintain bud viability reducing leaf petiole abscission in budsticks of 'Baianinha' and 'Valencia' sweet oranges (C. sinensis Osbeck), 'Tahiti' lime (C. latifolia Tanaka), and 'Murcott' tangor (C. sinensis × C. reticulata), using NAA, GA3, 2,4-D, and low temperature storage. After a 15-minutes-immersion in distilled water and NAA and GA3 solutions at concentrations of 10, 100, 500 and 1000 µmol L-1, and 2,4-D solutions at concentrations of 1, 10, 50 and 100 µmol L-1, the shoots were stored in polyethylene bags at 5 ± 1ºC for 74 days. Percentage of leaf petiole abscission, fresh and dry...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Growth regulator; Abscission; Propagation.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000400007

Comparação entre diversos substratos no enraizamento de estacas de crotón (Codiaeum variegatum L.)
Provedor de dados: 63
Autores: Tillmann,M.A.A.; Cavariani,C.; Piana,Z.; Minami,K.
Com o objetivo de determinar o melhor substrato para o enraizamento de estacas de crotón (Codiaeum variegatum L.), utilizou-se areia, vermiculita média, areia x vermiculita (75% x 25%); (50% x 50%); (25% x 75%), esponja fenólica e solo. O experimento foi conduzido em câmara de nebulização com delineamento em blocos casualizados com quatro repetições de vinte estacas cada. Determinaram-se as propriedades físicas dos substratos e foram efetuadas as seguintes avaliações: porcentagem de estacas enraizadas, porcentagem de estacas brotadas, número de raízes por estaca, comprimento da maior raiz e peso da matéria seca das raízes. Os resultados permitem concluir que o substrato vermiculita média é o mais indicado para o enraizamento de estacas de crotón, embora os...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cróton; Codiaeum variegatum; Substratos; Estacas; Enraizamento.
Ano: 1994
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000100003

Phenotypic recurrent selection to improve protein quality in non-opaque maize populations
Provedor de dados: 63
Autores: Garcia,Antonio Augusto Franco; Souza Jr.,Cláudio Lopes de.
Maize (Zea mays L.) protein is considered to be of low quality due to low levels of the essential lysine and tryptophan amino acids. An alternative to solve this problem is to use the opaque-2 gene, which improves the level of these amino acids, but has negative pleiotropic effects on agronomic characters. A phenotypic recurrent selection scheme was carried out in two non-opaque maize populations to verify the possibility of improving their protein quality without using this gene. Four cycles were completed and a 20% selection intensity for tryptophan content in the kernels was used in two populations, IG-1 and IG-2. The original and the four-cycle populations were evaluated in three locations for agronomic traits. For protein and tryptophan content, a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Tryptophan; Correlated response; Maize breeding.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000400018

Response of seeds and pollen of Onobrychis viciifolia and Onobrychis oxyodonta var. armena to NaCl stress
Provedor de dados: 63
Autores: Beyaz,Ramazan; Kaya,Gamze; Cocu,Sati; Sancak,Cengiz.
Sainfoin (Onobrychis viciifolia Scop.) is an important forage legume crop with 52 species adapted to dry and poor soils in Turkey, but little is known about the effects of salinity on germination and seedling growth in arid and semiarid regions suffering from salinity problem. The seeds and pollen of two species of sainfoin O. viciifolia and O. oxyodonta var. armena (Syn: O. armena) were exposed to 0, 5, 10, 20 and 30 dS m-1 of NaCl under in vivo and in vitro conditions and evaluated for germination under salt stress by comparing germination percentage, mean germination time, root and shoot length, fresh and dry seedling weight and dry matter. Increased salinity levels generally resulted in decrease in all traits except time to germination, dry seedling...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: In vivo; In vitro; Sainfoin; Salinity; Germination.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000400013

Identificação do vírus do mosaico do tomateiro (ToMV) Tobamovirus, por meio de anticorpos monoclonais
Provedor de dados: 63
Autores: Duarte,Keila Maria Roncato; Gomes,Luiz Humberto; Andrino,Felipe Gabriel; Leal Jr.,Gildemberg Amorin; Silva,Fabio Henrique Bicudo da; Paschoal,Jonas Augusto Rizzato; Giacomelli,Ana Maria Brancalion; Tavares,Flavio Cesar Almeida.
O tomateiro é uma olerícola de grande importância econômica e uma das mais suscetíveis a viroses, dentre as quais, a causada pelo vírus do mosaico do tomateiro (ToMV), gênero Tobamovirus, que tem como sintomas mosaico verde claro-escuro nas folhas, afilamento dos folíolos e diminuição da produção, entre outros sintomas. Visando a identificação do ToMV, foram produzidos anticorpos monoclonais (MAbs), testados através de PTA- ELISA ("plate trapped antigen- enzyme linked immunoassay"). O MAb (10.H1) foi utilizado para avaliar a capacidade de identificação do ToMV em testes no campo em plantas de tomate infectadas. O MAb não apresentou reação cruzada com TMV (tobamovirus do mosaico do tabaco) nem com extrato de plantas sadias. O ToMV das amostras foi isolado,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: ToMV; TMV; Anticorpo monoclonal; Diagnóstico; Tomate.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000100016

Lime and calcium-magnesium silicate in the ionic speciation of an Oxisol
Provedor de dados: 63
Autores: Antonangelo,João Arthur; Ferrari Neto,Jayme; Crusciol,Carlos Alexandre Costa; Alleoni,Luís Reynaldo Ferracciú.
ABSTRACT Plant residues and certain fertilizers accelerate soil acidification and increase the levels of aluminum-Al+3 in soils under no-tillage (NT). Silicates act as acidity amendments and as a source of silicon as in H4SiO4. An increase in the pH of soil solution causes the deprotonation of H4SiO4 and generates the anionic form (H3SiO4−). The aim of this study was to evaluate the ionic speciation of Si, Al, Ca, Mg and K in aqueous extracts by means of a software calculation. Since 2006, a field experiment has been under way on an Oxisol under NT subjected to lime and calcium-magnesium silicate applications under four crop systems. The amendments were applied in Oct 2006 and in Oct 2011, aiming to raise base saturation to 70 %. Soil samples were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil solution; Cations speciation; Aqueous extraction; Amendments.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162017000400317

Salinity reduced growth PS2 photochemistry and chlorophyll content in radish
Provedor de dados: 63
Autores: Jamil,Muhammad; Rehman,Shafiq ur; Lee,Kui Jae; Kim,Jeong Man; Kim,Hyun-Soon; Rha,Eui Shik.
When plants are grown under saline conditions, photosynthetic activity decreases leading to reduced plant growth, leaf area, chlorophyll content and chlorophyll fluorescence. Seeds and seedlings of radish (Raphanus sativus L.) were grown in NaCl solutions under controlled greenhouse conditions. The NaCl concentrations in complete nutrient solutions were 0 (control), 4.7, 9.4 and 14.1 dS m-1. The salinity reduced germination percentage and also delayed the germination rate as the salt level increased. Lengths and fresh weights of root and shoot decreased with the increasing salt concentration. Furthermore, photochemical efficiency of PS2 (Fv/Fm), photochemical quenching coefficient (qP), non photochemical quenching coefficient (qN), leaf area and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Raphanus sativus L.; Plant growth; Photosynthesis; Leaf area.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000200002

Sesbania virgata stimulates the occurrence of its microsymbiont in soils but does not inhibit microsymbionts of other species
Provedor de dados: 63
Autores: Florentino,Ligiane Aparecida; Guimarães,Ana Paula; Rufini,Márcia; Silva,Krisle da; Moreira,Fátima Maria de Souza.
The legume species Sesbania virgata establishes a specific and efficient symbiosis with Azorhizobium doebereinerae. Previous studies have shown that A. doebereinerae occurrence correlates to the presence of S. virgata. This work aimed to evaluate the occurrence of A. doebereinerae and of other nitrogen-fixing Leguminosae-nodulating bacteria (NFLNB) in soil samples collected adjacent to and 10 m away from the stems of five S. virgata plants in pasture areas. Symbiotic characteristics of isolates from these NFLNB populations were also studied. S. virgata and the four promiscuous legume species Leucaena leucocephala, Macroptilium atropurpureum, Phaseolus vulgaris and Vigna unguiculata were inoculated with soil samples to trap A. doebereinerae and other NFLNB....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Azorhizobium; Cupriavidus; Leguminosae; Nodulation; Nitrogen-fixing species.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000500012

Permeability - impermeability: canopy trees as biodiversity filters
Provedor de dados: 63
Autores: Gandolfi,Sergius; Joly,Carlos Alfredo; Rodrigues,Ricardo Ribeiro.
Each tropical and subtropical forest canopy species may create specific microsite conditions below its crown, which works as a filter for those species that attempt to regenerate below it. In function of the permeability or impermeability level, each canopy species could partially determine a plant community structure and composition beneath its crown projection. Therefore, present and future forest plant community biodiversity could be partially determined by the present structure of the canopy tree species community (filter effect). Some theoretical and practical aftermaths are suggested.
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Tropical forest dynamics; Tree regeneration; Gap dynamics; Ecological filters; Forest biodiversity.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000400015

Produção e qualidade de folhas de amoreira em função da época do ano e de colheita
Provedor de dados: 63
Autores: Miranda,José Ednilson; Bonacin,Gisele Aparecida; Takahashi,Roque.
A quantidade e qualidade das folhas de amoreira (Morus alba L.) exercem influência marcante sobre o desenvolvimento do bicho-da-seda e são, por sua vez, influenciadas por fatores como a idade das folhas, época do ano e características genéticas dos cultivares. Avaliou-se a produção e a qualidade nutricional de folhas de cinco cultivares de amoreira em diferentes épocas do ano e de colheita, objetivando verificar sua adaptação na região de Jaboticabal (SP). As folhas dos cultivares 'Miura', 'Korin', 'Calabresa', 'FM86' e 'FM Shima-Miura' foram colhidas na primavera, verão e outono após 45, 60, 75 e 90 dias da poda (DAP) e avaliadas quanto à produção de folhas níveis de proteína bruta (PB) e fibra em detergente neutro (FDN). As melhores produções foram...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Morus alba; Bicho-da-seda; Sericicultura; Massa foliar; Proteína bruta.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000300014

Morphological Interpretation of Reflectance Spectrum (MIRS) using libraries looking towards soil classification
Provedor de dados: 63
Autores: Demattê,José Alexandre Melo; Bellinaso,Henrique; Romero,Danilo Jefferson; Fongaro,Caio Troula.
The search for tools to perform soil surveying faster and cheaper has led to the development of technological innovations such as remote sensing (RS) and the so-called spectral libraries in recent years. However, there are no studies which collate all the RS background to demonstrate how to use this technology for soil classification. The present study aims to describe a simple method of how to classify soils by the morphology of spectra associated with a quantitative view (400-2,500 nm). For this, we constructed three spectral libraries: (i) one for quantitative model performance; (ii) a second to function as the spectral patterns; and (iii) a third to serve as a validation stage. All samples had their chemical and granulometric attributes determined by...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Remote sensing; Visible and near infrared; Spectroscopy; Spectral description; Spectrum classification.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162014000600010

Aggregate distribution, stability and release of water dispersible clay for two subtropical Oxisols
Provedor de dados: 63
Autores: Azevedo,Antonio Carlos de; Schulze,Darrel Gene.
The behavior of a soil regarding the dispersion and aggregation of its particles is very important for the development of environmental and agricultural soil functions. This study was conducted to determine how aggregate distribution and stability are impacted by land uses and how the release of Water Dispersible Clay (WDC) relates to disaggregation in Oxisols from subtropical Brazil. Samples from two Oxisols, collected at three depths from sites under no-tillage (NT), conventional tillage (CT) and native vegetation (NV) land uses were shaken in 250 mL plastic bottles for intervals up to 27 hours. The mass of aggregates was measured in five size classes ranging from 53 to 2000 µm. Most aggregates larger than 500 mm disappeared during the first 7.5 hours of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Land use; Disaggregation; Soil tillage; Soil management.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000100006

High fire temperature changes soil aggregate stability in slash-and-burn agricultural systems
Provedor de dados: 63
Autores: Thomaz,Edivaldo Lopes.
ABSTRACT Fire is a key controlling factor in ecosystem dynamics worldwide, especially, in tropical areas under slash-and-burn agricultural systems. Farmers use fire as a tool to clean the land, and benefit from nutrient enrichment from ash-soil heating. However, fire can cause some detrimental effects on soil systems, such as organic carbon depletion, increased soil erodibility, and changes to aggregate stability. In this study, an experimental fire was applied to a plot of land following the local traditional practice of slash-and-burn. The fire temperature was monitored in the field, and its effect on soil aggregate stability was assessed. The fire temperature on soil surface was measured in four trenches, and it ranged from 355 to 660 °C (average 484 ±...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Burn severity; Prescribed fire; Soil erodibility; Marginal land; Subsistence agriculture.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162017000200157

EFEITO ANTIBIÓTICO DO PRÓPOLIS SOBRE  BACTÉRIAS FITOPATOGÊNICAS
Provedor de dados: 63
Autores: BIANCHINI,L.; BEDENDO,I.P.
O efeito antibiótico de extrato aquoso de própolis, em várias concentrações, foi avaliado para cinco espécies de bactérias fitopatogênicas. Agrobacterium tumefaciens, Clavibacter michiganensis subsp. michiganensis e Xanthomonas axonopodis pv. phaseoli foram completamente inibidas em meio de cultura contendo 10% de extrato de própolis. Erwinia chrysanthemi foi parcialmente inibida, enquanto Pseudomonas syringae pv. tabaci se mostrou insensível ao extrato, desenvolvendo colônias idênticas àquelas observadas em meios livres de própolis. Concentrações menores não foram suficientes para exercer um efeito antimicrobiano desejável sobre as bactérias pertencentes a todas as espécies testadas. Resultados idênticos foram obtidos quando própolis foi incorporado ao...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Própolis; Controle; Bactéria fitopagênica; Antibiótico.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000100024

Plant regeneration from proroplasts of alfalfa (Medicago sativa) via somatic embryogenesis
Provedor de dados: 63
Autores: Monteiro,Mariza; Appezzato-da-Glória,Beatriz; Valarini,Maria José; Oliveira,Carlos Alberto de; Vieira,Maria Lucia Carneiro.
Alfalfa is one of the most frequently studied species from the production of tissue culture-derived embryos point of view. In this study, five alfalfa cultivars were analyzed with reference to their ability to regenerate plants from protoplast cultures via somatic embryogenesis. Plant regeneration from leaf-derived protoplasts isolated from the cultivar Rangelander was achieved using a protocol defined for alfalfa cell suspension-derived embryogenesis. Because of its high efficiency, this procedure is recommended for protoplast electroporation-mediated genetic transformation of alfalfa.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Plant biotechnology; In vitro culture; Morphogenesis; Forage legume.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000400012

Suplementação de vitamina C em rações para reversão sexual da tilápia do Nilo
Provedor de dados: 63
Autores: Toyama,Glaucio Nogueira; Corrente,José Eduardo; Cyrino,José Eurico Possebon.
O estudo avaliou o efeito da suplementação de vitamina C: 0; 50; 100; 200; 400; 600; 800; 1000 mg kg-1 na dieta de reversão sexual da tilápia do Nilo (Oreochromis niloticus). Foram avaliados o ganho de peso e incremento em comprimento aos 0, 10, 20 e 30 dias de tratamento; porcentagem da sobrevivência final (S%) e porcentagem de reversão sexual (RS%) de pós-larvas estocadas em "hapas" de 0,08 m³. A partir do 20º dia, foram observadas diferenças (P&lt;0,0001) para peso e comprimento. Os melhores resultados de ganho de peso foram obtidos com suplementação acima de 800 mg kg-1 da dieta, e para comprimento total, níveis acima de 400 mg kg-1; os piores desempenhos aconteceram em níveis abaixo de 50 mg kg-1. Níveis de suplementação de vitamina C acima de 200 mg...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Oreochromis niloticus; Vitamina C; Ácido ascórbico; Reversão sexual.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000200005

Autologistic model with an application to the citrus "sudden death" disease
Provedor de dados: 63
Autores: Krainski,Elias Teixeira; Ribeiro Junior,Paulo Justiniano; Bassanezi,Renato Beozzo; Franciscon,Luziane.
The citrus sudden death (CSD) disease affects dramatically citrus trees causing a progressive plant decline and death. The disease has been identified in the late 90's in the main citrus production area of Brazil and since then there are efforts to understand the etiology as well as the mechanisms its spreading. One relevant aspect of such studies is to investigate spatial patterns of the occurrence within a field. Methods for determining whether the spatial pattern is aggregated or not has been frequently used. However it is possible to further explore and describe the data by means of adopting an explicit model to discriminate and quantify effects by attaching parameters to covariates which represent aspects of interest to be investigated. One...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Spatial statistics; Plant disease; Binary response variable; Pseudolikelihood; Bootstrap.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000500014

Burial depths favor Italian ryegrass persistence in the soil seed bank
Provedor de dados: 63
Autores: Cechin,Joanei; Schmitz,Maicon Fernando; Hencks,Jonas Rodrigo; Vargas,Andres Antonio Monge; Agostinetto,Dirceu; Vargas,Leandro.
ABSTRACT: Italian ryegrass (Lolium multiflorum Lam.) is a weed broadly found in fields cultivated with wheat and barley crops. Seed inputs into the soil before harvesting winter crops increase seed bank, ensuring survival. This study evaluated the persistence of Italian ryegrass seeds subjected to burial depths over time. Experiments were carried out in the field for two years in randomized block experimental design with four repetitions. Dormant seeds harvested from mother-plants were put in nylon bags containing soil. Previously, seed viability was evaluated in a 1 % tetrazolium solution, and 50 viable seeds by repetition were buried at 0.5, 5.0, 10, and 20 cm depths. Seed persistence was evaluated by the percentage of deteriorated and remaining seeds,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lolium multiflorum Lam.; Seed bank weed management; Seed longevity; Seed dormancy; Soil seed bank inputs.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000300601

INFLUÊNCIA DO SISTEMA "FLOATING" NO CONDICIONAMENTO DO CRESCIMENTO DE  MUDAS DE PIMENTÃO (Capsicum annuum L.)
Provedor de dados: 63
Autores: VERDIAL,M.F.; IWATA,A.Y.; LIMA,M.S. de; TESSARIOLI NETO,J.
Foi estudado o efeito do "floating" no condicionamento do crescimento de mudas de pimentão produzidas em bandejas de isopor de 128 células. Foi utilizado o sistema de "floating" contendo uma solução de adubo solúvel 20-10-20 na concentração de 1g/L. A semeadura foi feita diretamente em bandejas de isopor. Após a germinação as bandejas foram submetidas aos diferentes condicionamentos: C1 - As bandejas permaneceram sempre fora do "floating" recebendo aspersão de água 2 vezes ao dia; C2 - Idem C1 mais irrigação da mesma solução do "floating" 3 vezes por semana usando-se 500ml de solução por bandeja; C3 - A cada dia as bandejas ficaram 12h dentro do "floating" e 12h fora; C4-As bandejas permaneceram todo o período do ensaio dentro do "floating", exceto a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pimentão; Mudas; Floating; Condicionamento.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000100005

Magnesium sulphate and the development of the common bean cultivated in an Ultisol of Northeast Australia
Provedor de dados: 63
Autores: Oliveira,Itamar Pereira de; Asher,Colin J.; Edwards,David G.; Santos,Renato S. Mota dos.
Magnesium applications (MgS0(4).7H(2)0) to achieve 8 and 16 mmol c/cm3 of Mg (324 and 1284 kg of MgS0(4) ha-1) were made on one Ultisol from Australia Northeast to correct Mg deficiency in plants and to verify the optimum level of Mg to grow common bean (Phaseolus vulgaris L). Magnesium was applied together with lime, N, K, Cu, Zn, B, and Mo as calcium carbonate, ammonium nitrate, potassium phosphate, cupric and zinc sulphate, boric acid and sodium molybdate respectively a month before planting and P as phosphoric acid at the planting. The pH reached the equilibrium after six weeks of incubation. Higher electrical conductivity (EC) was observed in soil where Mg was applied to reach 8 mmol c/cm3 in the absence of common bean and 16 mmol c/cm3 when the plant...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Magnesium; Plant height; Soil pH; Electrical conductivity.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000100025

Principles of crop modelling and simulation: II. the implications of the objective in model development
Provedor de dados: 63
Autores: Dourado-Neto,D.; Teruel,D.A.; Reichardt,K.; Nielsen,D.R.; Frizzone,J. A.; Bacchi,O.O.S.
With the purpose of presenting to scientists the implications of the objective in model development and a basic vision of modeling, with its potential applications and limitations in agriculture, an integration of crop modeling professionals with agricultural professionals is suggested. Models mean modernization of the information, of the measurement process and of an efficient way to learn more about complex systems. They are one of the best mechanisms of transforming information in useful knowledge and of transferring this knowledge to others. One of the problems that impede a larger progress in modeling is the lack of communication between modelers and a frequent appearance of modelers without a global vision of reality.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Crop modeling; Simulation.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000500009

Molecular characterization of GSyV-1 and GLRaV-3 and prevalence of grapevine viruses in a grape-growing area
Provedor de dados: 63
Autores: Moura,Cátia Jacira Martins de; Fajardo,Thor Vinícius Martins; Eiras,Marcelo; Silva,Fábio Nascimento da; Nickel,Osmar.
ABSTRACT: The aims of this study were to determine the prevalence of viruses in 119 samples from 32 grapevine cultivars, collected from nine vineyards in a specific grape-growing area in southeastern Brazil, perform a partial molecular characterization of 14 isolates of Grapevine Syrah virus 1 (GSyV-1) and Grapevine leafroll-associated virus 3 (GLRaV-3) and assess the coat protein genetic variability of these viruses. The detection of viruses was implemented by real-time RT-PCR (reverse transcription polymerase chain reaction) aiming to detect seven viruses and one viroid. With the exception of the Grapevine Cabernet Sauvignon reovirus (GCSV), the viruses and viroid that were evaluated were widespread in the sampled areas, often in high prevalence and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vitis; Diagnosis; Variability; Incidence; Leafroll.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162018000100043

Biology of Bemisia tabaci (Genn.) B biotype (Hemiptera, Aleyrodidae) on tomato genotypes
Provedor de dados: 63
Autores: Oriani,Maria Auxiliadora de Godoy; Vendramim,José Djair; Vasconcelos,Cristina Jensen.
Brazil is one of the main tomato (Solanum lycopersicum) producers worldwide. Nevertheless, considerable part of the production is lost due to Bemisia tabaci (Genn.) B biotype attacks. Resistant plants can be an important method for controlling this pest in an integrated pest management. Tests for evaluating some biological aspects of B. tabaci were carried out on 18 tomato genotypes, in controlled laboratory greenhouse conditions. Thirty-day-old plants placed in plastic cages were infested with 20 whitefly pairs each, for 24 h. The development of at least 30 eggs in three leaflets per plant (repetition) was observed until adult emergence. The development period of insects grown in LA1335, PI365928 and LA722 genotypes took three days longer when compared to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Insecta; Whitefly; Antibiosis; Antixenosis.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000100006

Combined effects of water status and iron deficiency chlorosis on grape composition in non-irrigated vineyards
Provedor de dados: 63
Autores: González,María-Rosa; Hailemichael,Girma; Catalina,Álvaro; Martín,Pedro.
ABSTRACT: Although water deficit and iron deficiency chlorosis are common environmental stresses in the Mediterranean area, few data are reported in the literature on their effects on vineyards, when acting simultaneously. The main objective of this research was to study the combined effects of iron deficiency and water status on vigor, yield and fruit composition in rainfed vineyards. Moreover, the investigation aimed to evaluate the feasibility of using foliar chlorophyll content (Chl) and predawn leaf water potential (LWP), measured at veraison, to assess potential quality of grapes in the framework of precision viticulture. For this, 24 non-irrigated ‘Tempranillo’ vineyard subzones were monitored in Ribera del Duero (North-Central Spain) during three...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vitis vinifera L.; Chlorophyll; Drought; Leaf area index; Stress.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162019001600473

Fractal analysis of agricultural nozzles spray
Provedor de dados: 63
Autores: Agüera,Francisco; Nuyttens,David; Carvajal,Fernando; Sánchez-Hermosilla,Julián.
Fractal scaling of the exponential type is used to establish the cumulative volume (V) distribution applied through agricultural spray nozzles in size x droplets, smaller than the characteristic size X. From exponent d, we deduced the fractal dimension (Df) which measures the degree of irregularity of the medium. This property is known as 'self-similarity'. Assuming that the droplet set from a spray nozzle is self-similar, the objectives of this study were to develop a methodology for calculating a Df factor associated with a given nozzle and to determine regression coefficients in order to predict droplet spectra factors from a nozzle, taking into account its own Df and pressure operating. Based on the iterated function system, we developed an algorithm...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pesticides application; Modeling.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162012000100002

EDTA assisted phytorremediation of a Pb contamined soil: metal leaching and uptake by jack beans
Provedor de dados: 63
Autores: Gabos,Mariana Bassetto; Abreu,Cleide Aparecida de; Coscione,Aline Reneé.
Lead (Pb) is one of the main soil contaminants. It is also of difficult phytoremediation due to its low solubility and high retention on soil particles. EDTA application to soil is a strategy to increase heavy metal phytoextraction, but such chelants usually cause phytotoxicity and metal leaching side effects. Therefore, these research work objectives were to evaluate the effects of single (0.5 g kg-1) and split (0.25 + 0.25 g kg-1) EDTA application on Pb uptake by jack beans (Canavalia ensiformis L.) as well as on Pb vertical movement in a Pb contaminated soil material. Two sets of experiments were carried out under greenhouse conditions: in the first one, plants were grown in 3L-pots filled with a Pb-contaminated soil to evaluate Pb uptake by plants; for...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Canavalia ensiformis L.; Lead; Phytoremediation; Chelant.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000400012

Economic analysis of organic greenhouse lettuce production in Turkey
Provedor de dados: 63
Autores: Engindeniz,Sait; Tuzel,Yuksel.
Health issues and environmental concerns have drawn the attention to organic agriculture aiming to protect the natural balance and to produce without damaging the environment. This study aims determining economic feasibility of organic greenhouse lettuce (Lactuca sativa L.) in an on farm trial, to foster organic greenhouse vegetable production in the preservation area of Tahtali Dam, projected as the sole water resource of Izmir, Turkey's third largest. A 384 m² greenhouse, constructed of galvanized metal tubing anchored and covered with a polyethylene was analyzed to identify typical operation procedures, and to determine unitary construction and operation cost. Organic lettuces were produced during autumn season of 2001-2002, testing different organic...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Vegetable; Organic farming; Organic fertilizer; Cost analysis.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000300012

High grain quality accessions within a maize drought tolerant core collection
Provedor de dados: 63
Autores: Ignjatovic-Micic,Dragana; Kostadinovic,Marija; Bozinovic,Sofija; Andjelkovic,Violeta; Vancetovic,Jelena.
Maize (Zea mays L.) landraces are an important source of genes for improving commercial germplasm. Today, drought tolerance and grain quality are major challenges in maize cultivation due to climatic changes and population growth. The Maize Research Institute genebank has a drought tolerant collection, which includes 13 landraces (from the former Yugoslavia) and 12 introduced populations (from different countries). These accessions were analyzed for protein, oil, starch and tryptophan contents, in order to identify drought tolerant accessions with high grain quality. Also, simple sequence repeat (SSR) analysis with specific primers for opaque2 recessive allele (o2) was carried out. All analyzed accessions showed high levels of protein. Oil content ranged...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Opaque2; Protein; Starch; Oil; Tryptophan.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162014000500009

Composition of pectic polysaccharides in a Portuguese apple (Malus domestica Borkh. cv Bravo de Esmolfe)
Provedor de dados: 63
Autores: Silva,Ana S.; Nunes,Claudia; Coimbra,Manuel A.; Guido,Luís F.
Malus domestica Borkh. cv Bravo de Esmolfe is a typical Portuguese apple cultivar classified as Protected Designation and Origin (PDO). It is a traditional product produced under strict conditions and labelled with a specific law protected designation. This cultivar presents quite good sweetness and flavor. The monosaccharide composition of the pectic polysaccharides from this traditional apple is herein reported for the first time. Based on the molar ratios obtained from the sugar composition, the presumable pectin structure could be inferred. The cell-wall polysaccharides present in the alcohol-insoluble residue (AIR) of unpeeled BE apple were sequentially fractionated. In addition, pectic material was also extracted by citric acid treatment prior to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pectin; Alcohol-insoluble residue; Galacturonic acid; Uronic acids.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162014000400011

Emergence and growth of corn and soybean under saline stress
Provedor de dados: 63
Autores: Blanco,Flávio Favaro; Folegatti,Marcos Vinícius; Gheyi,Hans Raj; Fernandes,Pedro Dantas.
Emergence and seedling growth may be severely affected by salinity, mainly for sensitive crops. The objective of the present study was to verify the tolerance of corn and soybean to the irrigation water salinity (ECi) during the emergence and initial development stages. Seeds of corn, hybrid 'AG-6690', and soybean, cv. 'Conquista', were sown in pots containing material from a sandy-loam soil and irrigated with water of increasing salinity levels, from 0.3 to 5.9 dS m-1, giving nine levels of ECi obtained by the addition of an equivalent proportion of sodium and calcium chloride, except for ECi = 0.3 dS m-1 (tap water). Emergence of corn was not affected by salinity but seedling development was reduced for ECi above 1.5 dS m-1. Emergence and growth of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays; Glycine max; Salinity tolerance; Soil solution.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000500001

ATIVIDADE MICROBIANA E PROPRIEDADES BIOQUÍMICAS DO SOLO RESULTANTES DA APLICAÇÃO DE GESSO AGRÍCOLA NA CULTURA DO REPOLHO
Provedor de dados: 63
Autores: NAHAS,E.; DELFINO,J.H.; ASSIS,L.C.
Este estudo investigou o impacto da aplicação de gesso agrícola e de uma fonte rica em enxofre sobre as características microbianas e bioquímicas de um latossolo vermelho escuro cultivado com repolho. As aplicações de gesso foram de 134, 268 e 402 kg de S/ha. Foram incluídos um tratamento controle, sem enxofre, um contendo a adubação normal de sulfato de amônio (402kg de S/ha) e outro com adubo verde (20t/ha de lab-lab, peso seco). Em resposta a adições crescentes de enxofre no solo verificou-se que enquanto o número de bactérias totais aumentou, o número de bactérias Gram-negativas diminuiu. Os demais grupos de microrganismos, Bacillus spp, actinomicetos e fungos, não variaram significativamente ou não apresentaram uma resposta satisfatória. O aumento do...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gesso agrícola; Bactérias; Fungos; Desidrogenase; Urease; Arilsulfatase.
Ano: 1997
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161997000200008

Comparison of ethylene carbonate and formamide as components of the hybridization mixture in FISH
Provedor de dados: 63
Autores: Kalinka,Anna; Myśliwy,Monika; Achrem,Magdalena.
ABSTRACT The protocols for in situ hybridization (ISH) techniques can vary considerably; however, they usually include denaturation and hybridization steps. Denaturing compounds are used to reduce denaturation and hybridization temperature, which keeps the proper morphology of the preparation. Formamide is the most commonly used reagent in in situ hybridization to lower the melting temperature. The substitution of toxic formamide for a non-toxic ethylene carbonate at 20 % and 50 % concentration in the hybridization mixture helped obtain a high quality in situ hybridization result with two sequences characteristic for rye, JNK, and Bilby. The results after hybridization, with a duration of 90 min and 16 h, were identical when formamide or ethylene carbonate...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Secale; In situ hybridization; Repeated sequences; Non-toxic.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000401101

Roof modular system in wood and particle board (OSB) to rural construction
Provedor de dados: 63
Autores: Fiorelli,Juliano; Soriano,Julio; Lahr,Francisco Antonio Rocco.
Wood is a material of great applicability in construction, with advantageous properties to form various structural systems, such as walls and roof. Most of the roof structural systems follow models that have remained unchanged for a long time. A roof modular system in distinguished materials is proposed: reforested wood (Pine), oriented strand board (OSB) and roof tiles made of recycled long-life packaging material in order to be applied in rural construction. In this alternative, besides the benefit of giving destination packages with long-life thermal comfort, it also highlights the use of reforestated wood being the cultivation of such species that provides incentive for agribusiness. The structural performance of this alternative was evaluated through...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Structural system; Recycled tile; Reforestation wood.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162012000300003

Managing agricultural phosphorus to minimize water quality impacts
Provedor de dados: 63
Autores: Sharpley,Andrew.
ABSTRACT Eutrophication of surface waters remains a major use-impairment in many countries, which, in fresh waters, is accelerated by phosphorus (P) inputs from both point (e.g., municipal waste water treatment plants) and nonpoint sources (e.g., urban and agricultural runoff). As point sources tend to be easier to identify and control, greater attention has recently focused on reducing nonpoint sources of P. In Brazil, agricultural productivity has increased tremendously over the last decade as a consequence, to a large extent, of increases in the use of fertilizer and improved land management. For instance, adoption of the “4R” approach (i.e., right rate, right time, right source, and right placement of P) to fertilizer management can decrease P runoff....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fertilizer management; Conservation practices; Runoff; Erosion; Eutrophication.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000100001

Root temperature and energy consumption at different cable depths in electrically heated substrates
Provedor de dados: 63
Autores: Fernandez,María Dolores; Rodriguez,Manuel Ramiro; Pidre,Rafael López; Teijeiro,Teresa.
A finite element method-based model of a substrate heated by an electric heating cable buried in a thermal isolated container was experimentally validated with root mean square error values of root zone temperature ranging 0.25 to 0.62 ºC. The two-dimensional transient model allowed variations in the physical properties of the substrate with temperature, water content and depth. The operation of nine configurations of a heating cable buried in sand at different depths (50 to 450 mm, at 50 mm intervals) at 200 mm spacing was simulated and assessed. The validated model was used to perform 24-h simulations applying boundary conditions, and substrate moisture content was experimentally obtained at a mean substrate surface temperature of 13.98 ºC. Such...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: FEM model; Heat consumption; Heating systems; Soil heating.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000500001

Simulating wind effect on microsprinkler water distribution
Provedor de dados: 63
Autores: Conceição,Marco Antônio Fonseca; Coelho,Rubens Duarte.
Wind incidence can affect microsprinkler water distribution. Evaluations of those conditions can be facilitated using simulations by computational models. The present work evaluates the performance of a ballistic model on simulating the wind effect on microsprinkler water distribution. Experimental tests were carried out using self-compensating microsprinklers, nozzle sizes 1.00 mm (gray), 1.10 mm (brown), 1.48 mm (orange), and 1.75 mm (yellow). The gray and brown nozzles used black swivels and the orange and yellow nozzles used blue swivels. The wind effect was artificially caused by fourteen 200 W fans. Computational simulations were realized using SIRIAS software, based on a ballistic model originally developed for sprinkler systems. The correlation...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Irrigation; Software.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000200001

Post-harvest quality of fresh-marketed tomatoes as a function of harvest periods
Provedor de dados: 63
Autores: Ferreira,Marcos David; Franco,André Toshiro Oshima; Kasper,Ricardo Freitas; Ferraz,Antonio Carlos Oliveira; Honório,Sylvio Luiz; Tavares,Marcelo.
Losses on tomato business chain start at harvest, a two-months period. At the beginning of the harvest, fruits concentrate at the basal part of the plant, then in the middle, and finally at the top, and undergo changes in diameter and maturity indexes as harvest progresses. The aim of this work was to evaluate the impact of handling at three different periods: (I) 15 days, (II) 30 days, and (III) 45 days after the beginning of harvest. Tomatoes were ordinarily grown and harvested in to bamboo baskets, and transferred to plastics boxes. Fruits were classified according to ripening stage and diameter, and evaluated for mechanical damage and external defects caused by harvesting procedures. The time required for the harvest operation was measured; damage to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lycopersicon esculentum; Losses; Post-harvest; Mechanical injury.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000500006

Sulfites in beer: reviewing regulation, analysis and role
Provedor de dados: 63
Autores: Guido,Luis F.
ABSTRACT Beer is an extremely complex mixture of more than 3,000 different compounds in an aqueous environment. Thus, it is perhaps not surprising that the maintenance of beer quality throughout its lifetime has been a considerable challenge for brewers. Whilst it is inevitable that chemical changes will occur in beer with the passage of time, it is the formation of flavor-active components which is of immediate concern to an overview of beer shelf life stability. Sulfur dioxide has long been recognized by brewers as the most important factor in delaying flavor staling, and prolonging the shelf life of beer. However, nowadays, sulfur dioxide and sulfites are considered allergens and concerns about the safety of their use as food additives have been on the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Beer flavour; Sulfur dioxide; Legislation toxic effects; Antioxidants.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000200189

Plantas visitadas por abelhas africanizadas em duas localidades do estado de São Paulo
Provedor de dados: 63
Autores: Marchini,Luís Carlos; Moreti,Augusta Carolina de Camargo Carmello; Teixeira,Erica Weinstein; Silva,Etelvina Conceição Almeida da; Rodrigues,Ricardo Ribeiro; Souza,Vinicius Castro.
O conhecimento das plantas de uma região, sua época de florescimento e as características do pólen, auxiliam na determinação das espécies vegetais que contribuem para a composição do mel. Durante o período de 1994 a 1997 foram inventariadas, semanalmente, em diferentes horários e num raio de aproximadamente 300m dos apiários da USP/ESALQ, em Piracicaba,SP (22°43'S, 47°27'W e 580 m) e do Instituto de Zootecnia, em Pindamonhangaba, SP (22°57'S, 45°27'W e 560 m), as plantas que estavam sendo visitadas por abelhas. Foram anotados o mês e o período de florescimento das plantas inventariadas. Em Piracicaba foram identificadas 94 espécies de plantas pertencentes a 41 famílias (maior número de espécies nas famílias Asteraceae e Myrtaceae) e em Pindamonhangaba, 76...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Apis mellifera; Abelha; Recurso floral; Similaridade.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000200028

Crown size and transplant type on the strawberry yield
Provedor de dados: 63
Autores: Cocco,Carine; Andriolo,Jerônimo Luiz; Cardoso,Francieli Lima; Erpen,Ligia; Schmitt,Odair José.
Strawberry (Fragaria x ananassa D.) yield is affected by vigor of transplants. Those young and vigorous at planting lead to plants reaching higher vegetative growth and fruit yield than weak or old ones. This study aimed at determining plant growth, development, and fruit yield of the strawberry plant from bare root and plug transplants with different crown diameters. Bare root transplants were produced by rooting stolons and plug transplants from runner tips collected and rooted in a substrate growing bed. Three classes of crown diameters were compared in a 2 × 3 factorial and randomized block experimental design, with four replications, 16 plants per plot and a density of 6.6 plants m-2. For bare root transplants, crown diameters were between 3.0 and 5.0...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fragaria x ananassa Duch; Propagation; Plug plants; Bare root transplants; Transplants vigor.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000400015

Relationships between labile soil organic carbon fractions under different soil management systems
Provedor de dados: 63
Autores: Souza,Géssica Pereira de; Figueiredo,Cícero Célio de; Sousa,Djalma Martinhão Gomes de.
ABSTRACT The study of labile carbon fractions (LCF) provides an understanding of the behavior of soil organic matter (SOM) under different soil management systems and cover crops. The aim of this study was to assess the effect of different soil management systems with respect to tillage, cover crop and phosphate fertilization on the amount of the LCF of SOM. Treatments consisted of conventional tillage (CT) and no-tillage (NT) with millet as the cover crop and a no-tillage system with velvet bean at two phosphorus dosages. Soil samples were collected and analyzed for organic carbon (OC), C oxidizable by KMnO4 (C-KMnO4), particulate OC (POC), microbial biomass carbon and light SOM in the 0.0-0.05, 0.05-0.10 and 0.10-0.20 m soil layers. The Carbon Management...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Labile organic matter; Soil organic matter; Phosphorus fertilization.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000600535

Avaliação do estado nutricional do feijoeiro (Phaseolus vulgaris L.) cultivado em solução nutritiva, com variação no fornecimento de N, P e K
Provedor de dados: 63
Autores: Camacho,R; Calvache,A.M.; Falcão,N.; Fernandez,F.; Demattê,J.A.M.; Malavolta,E.
O feijoeiro (Phaseolus vulgaris L. cv. Carioca) foi cultivado em solução nutritiva na presença das seguintes concentrações de N, P e K, respectivamente em milimoles por litro: 16-2-6; 4-2-6; 1,6-2-6; 16-0,5-6; 16-0-6; 16-2-3; 16-2-0,6. Os outros macronutrientes e os micronutrientes foram fornecidos em doses iguais a todas as plantas. O estado nutricional foi avaliado através das seguintes técnicas: diagnose foliar (determinação dos teores totais de N, P e K e da concentração de nitrato e fosfato solúvel), atividade da redutase do nitrato (RNO3). Todos os métodos utilizados refletiram bem o estado nutricional do feijoeiro, exceto para P, .sendo que para a atividade da RNO3, os teores totais de N e K e de N-nitrato foram os que apresentaram a melhor...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Feijoeiro; Concentração de nutrientes; Avaliação do estado nutricional; Redutase do nitrato.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000300003

Efeitos do alumínio em pimenteiras do reino (Piper nigrum, L.)cultivadas em solução nutritiva
Provedor de dados: 63
Autores: Veloso,C.A.C.; Muraoka,T.; Malavolta,E.; Carvalho,J.G. de.
A pimenteira do reino (Piper nigrum, L.) vem sendo cultivada, em sua maior parte, em áreas com solos de baixa fertilidade natural, caracterizadas por baixa saturação por bases, alta saturação de alumínio e acidez elevada. Visando estudar os efeitos do alumínio sobre a cultura foi conduzido um experimento com a cultivar Guajarina em solução nutritiva. As doses de alumínio estudadas foram: 0; 5; 10; 15; 20 e 40 mg/L. O sintoma inicial de toxidez de alumínio foi caracterizado por um retardamento no crescimento radicular, com aumento no diâmetro das raízes. Observou-se efeito positivo do alumínio na produção de matéria seca com adição de até 15 mg/L na solução, o que correspondeu a maior absorção de P, K, Ca, Mg, Mn, Fe e AL Concluiu-se que a pimenteira é...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Piper nigrum; Toxidez de alumínio; Absorção; Nutrição.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000200027

Edible mushroom Pleurotus sajor-caju production on washed and supplemented sugarcane bagasse
Provedor de dados: 63
Autores: Moda,Evelise Moncaio; Horii,Jorge; Spoto,Marta Helena Fillet.
Traditionally, the cultivation of Pleurotus sajor-caju is performed on different composted and pasteurized agricultural residues. The objective of this study was to investigate whether traditional composting and pasteurization processes could be replaced by washed and supplemented (mineral or organic) sugarcane bagasse. In one experiment, fresh sugarcane bagasse was immersed in hot water at 80°C for two hours (control) or washed in fresh water for one hour using an adapted machine for residue treatment. In another experiment, fresh sugarcane bagasse was washed in fresh water (control), and supplemented with corn grits (organic supplementation), or supplemented with nutrient solution (mineral supplementation). In the first experiment, the washed bagasse...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Basidiomycetes; Substrate; Pasteurization; Supplementation.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000200006

ADUBAÇÃO NPK E PRODUÇÃO DE BORRACHA SECA PELA SERINGUEIRA (Hevea brasiliensis)
Provedor de dados: 63
Autores: Murbach,Marcos Roberto; Boaretto,Antonio Enedi; Muraoka,Takashi; Silveira,Ronaldo Ivan; Boaretto,Rodrigo Marcel.
Instalou-se um experimento, na região de Garça, SP, em um solo Latossolo Vermelho escuro, A moderado, textura arenosa, com o objetivo de se avaliar a influência da adubação NPK sobre a produtividade de borracha seca da seringueira (Hevea brasiliensis) clone "PB 235", com 13 anos de idade. O experimento foi instalado em blocos ao acaso, em esquema fatorial fracionário (1/4)43, totalizando 16 tratamentos e 4 repetições, onde se utilizaram 4 níveis de N (0, 80, 160, 320 kg ha-1), 4 de K2O (0, 80, 160, 320 kg ha-1) e 4 de P2O5 (0, 40, 80, 160 kg ha-1). A produção foi avaliada entre os mêses de outubro de 1995 a junho de 1996. Conclui-se que a adubação potássica aumentou a produtividade de borracha seca, o mesmo não ocorrendo com a adubação nitrogenada e...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Seringueira; Adubação; NPK.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000100011

Intensidades de pastejo e a composição morfológica de pastos de Cynodon spp
Provedor de dados: 63
Autores: Fagundes,Jailson Lara; Silva,Sila Carneiro da; Pedreira,Carlos Guilherme Silveira; Carnevalli,Roberta Aparecida; Carvalho,Carlos Augusto Brandão de; Sbrissia,André Fisher; Pinto,Luiz Felipe de Moura.
Avaliou-se a composição morfológica de pastos de Cynodon spp. (‘Tifton 85’, ‘Florakirk’ e ‘Coastcross’) submetidos a quatro intensidades de pastejo (5, 10, 15 e 20 cm) estabelecidas por ovinos em regime de lotação contínua. O delineamento experimental utilizado foi o de blocos completos casualizados com quatro repetições e parcelas sub-divididas, onde na parcela foram alocados os cultivares e na sub-parcela as intensidades de pastejo. O período de avaliação foi de 3 de julho a 31 de dezembro de 1998. Pastos mantidos mais altos apresentaram as maiores massas de forragem (kg MS ha-1), sendo que ‘Tifton 85’ apresentou os valores mais elevados, seguido de ‘Florakirk’ e de ‘Coastcross’. Valores calculados para densidade "bulk" (kg MS cm-1 ha-1) mostraram-se...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cynodon; Intensidade de pastejo; Composição morfológica.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000400017

EXPERIMENTOS EM PARCELAS SUBDIVIDIDAS COM TRATAMENTOS PRIMÁRIOS EM BLOCOS INCOMPLETOS PARCIALMENTE BALANCEADOS: II. ANÁLISE INTRABLOCOS
Provedor de dados: 63
Autores: MORAIS,A.R. de; NOGUEIRA,M.C.S.
O objetivo do presente trabalho foi desenvolver uma metodologia adequada para análise intrablocos de experimentos em parcelas subdivididas quando os tratamentos primários estão dispostos em uma estrutura de delineamento em blocos incompletos parcialmente balanceados. Usando o método dos mínimos quadrados foram determinadas as expressões para as várias somas de quadrados que compõem a análise de variância e a composição do teste F.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Delineamento; Experimental; Análise intrablocos; Blocos incompletos; Parcelas subdivididas.
Ano: 1996
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161996000100020

Yield performance and leaf nutrient levels of coffee cultivars under different plant densities
Provedor de dados: 63
Autores: Paulo,Edison Martins; Furlani Jr.,Enes.
Coffee (Coffea Arabica L.) plantations using adapted cultivars to regional environmental conditions with optimal plant population density and adequate nutrition are expected to show high yield responses. The triennial production and leaf macronutrient concentrations of four coffee cultivars were studied under different plant population densities. Catuaí Amarelo (IAC 47), Obatã (IAC 1669-20), Acaiá (IAC 474-19) and Icatu Amarelo (IAC 2944) were planted in densities of 2,500; 5,000; 7,519; and 10,000 plants ha-1 with one plant per hole and two plants per hole in the 2,500 plant ha-1. Plants were homogeneously fertilized without liming. As the population density increased the triennial coffee productivity increased, the yield per plant decreased, and leaf...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dense system; Nutrition.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000600015

Conceitos sobre solos coesos e hardsetting
Provedor de dados: 63
Autores: Giarola,Neyde Fabíola Balarezo; Silva,Alvaro Pires da.
Diferenças marcantes entre os graus de consistência do solo seco e úmido foram incorporadas ao sistema brasileiro de classificação de solos por meio da utilização do termo "coeso", o qual caracteriza solos que, quando secos, apresentam um incremento acentuado de resistência à penetração, e uma sensível redução dessa resistência, quando úmidos. Esse comportamento foi observado, há muito tempo, em solos da Austrália, tendo sido originalmente incorporado ao sistema australiano de classificação como "hardsetting". O objetivo deste trabalho foi mostrar as similaridades entre solos coesos e "hardsetting", com o entendimento de que essa conexão será útil nas pesquisas com solos coesos no Brasil.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Tabuleiros Costeiros; Atributos de solos; Horizontes endurecidos; Resistência do solo; Consistência do solo.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000300030

Efeito inibitório de extratos vegetais sobre Colletotrichum gloeosporioides - agente causal da podridão de frutos de mamoeiro
Provedor de dados: 63
Autores: Ribeiro,Luiz Fernando; Bedendo,Ivan Paulo.
Extratos aquosos foram obtidos a partir de bulbilhos de alho, folhas de hortelã e mamona e frutos de pimenta. Após a incorporação destes extratos em BDA, obtendo-se concentrações de 100, 200, 500, 1000, 5000 e 10000 ppm, foi avaliado o crescimento e a produção de conídios de um isolado de Colletotrichum gloeosporioides, agente de podridão em frutos de mamoeiro. Os resultados demonstraram o efeito inibitório dos diferentes extratos a partir da concentração de 200 ppm. O extrato de alho inibiu o crescimento micelial, em porcentagens variáveis de 5,3 a 67,6%, porém não atuou de modo expressivo sobre a produção de conídios. Em contraposição, os extratos de hortelã, mamona e pimenta promoveram inibição menos acentuada do crescimento de micélio, porém reduziram...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Colletotrichum gloeosporioides; Extrato vegetal; Pós-colheita.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000500031

DISPONIBILIDADE DE FÓSFORO PARA PLANTAS DE  ARROZ AVALIADA POR EXTRATORES QUÍMICOS
Provedor de dados: 63
Autores: BELTRÁN,R.R.; SILVEIRA,R.I.; PASSOS,M.J.
Avaliou-se a disponibilidade de fósforo para o arroz, em casa de vegetação, em um solo ácido e com deficiência de P. Utilizou-se 0,5 dm3 de solo, cinco fontes de fósforo (fosfato natural Alvorada-FNA, fosfato monoamônico-MAP, superfosfato simples-SFS, superfosfato triplo-SFT, e termofosfato magnesiano-TM), três doses (100, 200 e 300 mg P dm-3 de solo), uma testemunha e 10 plantas de arroz por vaso. Analisou-se o fósforo do solo por três extratores: Mehlich-1, Olsen e resina. Os fertilizantes aumentaram significativamente a produção de matéria seca em relação à da testemunha. A máxima produção foi alcançada com MAP e SFS na dose 200 mg P dm-3 de solo. A matéria seca, a porcentagem de P e o P absorvido foram correlacionados com os teores de fósforo extraídos...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Adubação; Fósforo; Análise do solo; Oriza sativa; Extratores.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000200011

Efficiency of water application of irrigation systems based on microsprinkling in banana plantations
Provedor de dados: 63
Autores: Silva,Alisson Jadavi Pereira da; Coelho,Eugênio Ferreira; Miranda,Jarbas Honório de.
Further food production may be limited by the reduced availability of water resources. Since irrigated agriculture is the productive sector that presents a higher demand of water, this sector has been under intense pressure in order to ensure food production with improved efficiency of water use. This study aimed to use the Time Domain Reflectometry (TDR) technique to measure percolation losses and to determine water application efficiency of banana (Musa spp.) trees using microsprinkler irrigation systems. Three systems were studied: (i) one 32 L h-1 microsprinkler for four plants; (ii) one 60 L h-1 microsprinkler for four plants; and (iii) one 60 L h-1 microsprinkler for two plants. Systems that replace water to the soil with the lowest variation of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: TDR; Musa spp.; Root distribution; Irrigation management.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162013000300001

Energy balance in irrigated wheat in the cerrados region of Central Brazil
Provedor de dados: 63
Autores: Luchiari Jr.,A.; Riha,S. J.; Gomide,R.L.
To evaluate the water requirements for irrigated wheat, a micrometeorological study was conducted during the dry seasons of 1982 and 1983 at the Cerrados Agricultural Research Center, Brasilia-DF, Brazil The crop was irrigated when the soil water potential at 5 cm rached -60 to -70J/Kg.Bowen ratio measurements were made on an hourly basis during the entire crop season. Total amount of water evapotranspired during the crop cycle and the energy balance terms varied year to year due to regional advection; In 1982, a less advective year, the total amount of water evapotranspired was 345 mm, with approximately 80% of the net radiation dissipated as latent heat, 13% as a sensible heat and 7% as soil heat after the crop obtained a Leaf Area Index (LAI) of 1.5. In...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Energy balance; Irrigated wheat; Cerrado.
Ano: 1997
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161997000300011

Índice de área foliar, interceptação luminosa e acúmulo de forragem em pastagens de Cynodon spp. sob diferentes intensidades de pastejo
Provedor de dados: 63
Autores: Fagundes,Jaílson Lara; Silva,Sila Carneiro da; Pedreira,Carlos Guilherme Silveira; Sbrissia,André Fischer; Carnevalli,Roberta Aparecida; Carvalho,Carlos Augusto Brandão de; Pinto,Luis Felipe de Moura.
Avaliou-se o índice de área foliar (IAF), interceptação luminosa (IL) e acúmulo de matéria seca em três cultivares de Cynodon spp. (Tifton-85, Florakirk e Coastcross) submetidos a quatro intensidades de pastejo (5, 10, 15 e 20 cm) estabelecidas com ovinos em regime de lotação contínua. O delineamento experimental utilizado foi o de blocos completos casualizados com quatro repetições e parcelas sub-divididas, onde na parcela foram alocados os cultivares e na sub-parcela as intensidades de pastejo. Os maiores valores de IAF foram encontrados para Tifton-85. As taxas de acúmulo de matéria seca foram semelhantes em todos os tratamentos. Tifton-85 apresentou como amplitude ótima de uso condições de pasto que variaram de 5 a 15 cm. Para Florakirk essa amplitude...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Tifton-85; Florakirk; Coastcross; Manejo do pastejo; Lotação contínua.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000500016

Relationship between panicle differentiation and main stem leaf number in rice genotypes and red rice biotypes
Provedor de dados: 63
Autores: Streck,Nereu Augusto; Lago,Isabel; Bosco,Leosane Cristina; Paula,Gizelli Moiano de; Oliveira,Felipe Brendler; Gabriel,Luana Fernandes; Schwantes,Ana Paula.
Panicle differentiation (DP) is a key developmental stage in rice (Oryza sativa L.) because at this stage plant switches from vegetative to reproductive development and source-sink relation changes to allocate part of the photoassimilates for growing spikelets and kernels. The objective of this study was to determine the main stem Haun Stage (HS) and the number of leaves that still have to emerge until flag leaf at PD in several cultivated rice genotypes and red rice biotypes in different sowing dates. A two-year field experiment was conducted in Santa Maria, Rio Grande do Sul State, Brazil, during the 2005-2006 and 2006-2007 growing seasons, and three sowing dates each year. Nine cultivated rice genotypes and two red rice biotypes were used. PD was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Oryza sativa L.; COUNCE scale; Haun Stage; Crop management; Flag leaf.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000200008

Water extraction variability in the banana root zone affects the reliability of water balance
Provedor de dados: 63
Autores: Silva,Alisson Jadavi Pereira da; Coelho,Eugênio Ferreira; Coelho Filho,Maurício Antônio.
Spatial and temporal variability of soil water extraction from the root zone affect soil water balance determination. The number of sensors installed in the root zone in studies addressing water balance is still set arbitrarily. This study provided an investigation of the water extraction process by banana (Musa spp.) roots by (i) determining the variability of water extraction from the banana tree root zone, (ii) detecting differences in the estimation of evapotranspiration (ET) by the soil water balance method when the number of soil profiles monitored in the roots zone varies, (iii) and; determining the minimum number of Time Domain Reflectometry (TDR) probes needed to obtain ET precision and accuracy similar to that determined by a drainage lysimeter....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil moisture; Soil water balance; Water uptake.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162015000100001

Biological parameters of Spodoptera frugiperda (J.E. Smith) (Lepidoptera: Noctuidae) assayed with Bacillus thuringiensis berliner
Provedor de dados: 63
Autores: Polanczyk,Ricardo Antonio; Alves,Sérgio Batista.
The bacterium Bacillus thuringiensis (Bt) is a promising control agent of Spodoptera frugiperda (J.E. Smith). Besides the lethal effect on hosts, the entomopathogen may cause physiological alterations that hinder insects' feeding intake and reproduction. Larval and female pupa weight, oviposition and egg fecundity were determined in second instar S. frugiperda larvae infected with 39 Bt isolates in four bioassays. Sublethal effects were observed in the follow isolates: ESALQ 1.1, ESALQ 1.4, ESALQ 1.6, ESALQ 3.7, ESALQ 4.2 and ESALQ 5.2 (larval and female pupae weight); ESALQ 5.1 (larval weight); ESALQ 1.2 and ESALQ 3.7 (egg fecundity); ESALQ 3.7 (oviposition and egg fecundity); ESALQ 3.7 and ESALQ 5.2 (oviposition). Significant correlations were observed...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Entomopathogen; Fall armyworm; Sublethal effects.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000500009

ASPECTOS ANATÔMICOS DO ENRAIZAMENTO DA  VIDEIRA MUSCADÍNIA (Vitis rotundifolia Michx.) ATRAVÉS DE ALPORQUIA
Provedor de dados: 63
Autores: PACHECO,A.C.; CASTRO,P.R.C.; APPEZZATO-DA-GLÓRIA,B.
A multiplicação das videiras é comumente realizada através de processos vegetativos como a estaquia e a enxertia, os quais nem sempre apresentam resultados satisfatórios, especialmente para as espécies de difícil enraizamento, comprometendo a produção comercial. A uva muscadínia (Vitis rotundifolia Michx.) é considerada uma planta difícil de enraizar. Sua propagação através da estaquia mostra que o emprego de reguladores vegetais proporciona pouco ou nenhum benefício ao enraizamento das estacas. Atualmente, a alporquia em frutíferas vem se apresentando como um método de propagação que proporciona um bom enraizamento, aliado à aplicação de reguladores vegetais. Este trabalho procurou avaliar a eficiência do processo de alporquia com relação ao enraizamento...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vitis rotundifolia Michx; Alporquia; Calo; Raizes adventícias; Uva.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000200007

Morphological phenotypic dispersion of garlic cultivars by cluster analysis and multidimensional scaling
Provedor de dados: 63
Autores: Silva,Anderson Rodrigo da; Cecon,Paulo Roberto; Dias,Carlos Tadeu dos Santos; Puiatti,Mário; Finger,Fernando Luiz; Carneiro,Antônio Policarpo Souza.
Multivariate techniques have become a useful tool for studying the phenotypic diversity of Germplasm Bank accessions, since they make it possible to combine a variety of different information from these accessions. This study aimed to characterize the phenotypic dispersion of garlic (Allium sativum L.) using two multivariate techniques with different objective functions. Twenty accessions were morphologically characterized for bulb diameter, length, and weight; number of cloves per bulb; number of leaves per plant; and leaf area. Techniques based on generalized quadratic distance of Mahalanobis, UPGMA (Unweighted Pair Group Method with Arithmetic Mean) clustering, and nMDS (nonmetrric MultiDimensional Scaling) were applied and the relative importance of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Allium sativum L.; NMDS; UPGMA; Genetic divergence.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162014000100005

Resíduos agroindustriais prensados como substrato para a produção de mudas de cana-de-açúcar
Provedor de dados: 63
Autores: Morgado,Ivan Ferrreira; Carneiro,José Geraldo de Araujo; Leles,Paulo Sérgio dos Santos; Barroso,Deborah Guerra.
Um experimento com Saccharum spp. foi conduzido, tendo como objetivo desenvolver uma nova metodologia de produção de mudas desta espécie, utilizando três resíduos agroindustriais prensados, como substrato. Foram estudadas diferentes proporções de bagaço de cana-de-açúcar, torta de filtro de usina e casca de coco na composição do substrato. O sistema de blocos prensados, de origem finlandesa, foi comparado ao sistema convencional. A qualidade das mudas, no final da rotação no viveiro, foi avaliada através do diâmetro de colo, número de perfilhos por planta, peso de matéria seca das partes aérea, radicular e total e o desempenho das mudas 12 meses após o plantio, através do comprimento, diâmetro, número de entrenós e peso dos colmos. Os três resíduos...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cana-de-açúcar; Substrato; Recipiente; Muda.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000400017

Environmental conditions in broiler multi-stage setter: a case study
Provedor de dados: 63
Autores: Gigli,Ana Carolina de Souza; Baracho,Marta dos Santos; Nääs,Irenilza de Alencar; Salgado,Douglas D'Alessandro; Alvarenga,Débora Passos.
Production of one day-old chick production is one of the most important segments in the poultry production business. Broiler chicken incubation environment needs to be homogeneous and adequate so hatchability and final product quality are not affected. This research aimed at evaluating environmental conditions inside a multi-stage setter in a commercial hatchery house. The incubator was split into six areas and data loggers placed in the geometric center to register temperature and relative humidity data; carbon dioxide concentration and number of colony forming units (CFU) of fungi were also sampled and analyzed; Kruskal-Wallis non-parametric test was used for statistical analysis; significant differences in temperature and relative humidity distribution...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Poultry; Incubation; Environment.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000200001

Savanna woodland soil micromorphology related to water retention
Provedor de dados: 63
Autores: Juhász,Carlos Eduardo Pinto; Cooper,Miguel; Cursi,Patrícia Ribeiro; Ketzer,André Oppitz; Toma,Raul Shiso.
The limiting factors of the Brazilian savanna physical environment have been largely discussed. Soil morphology is fundamental to understand the behavior of soil water flow, soil physical properties and soil-landscape relationships. The aim of this study is to relate soil micro and macromorphologic attributes to soil water retention on a toposequence under native savanna woodland (cerradão) in a permanent plot of 320 m &lt;FONT FACE=Symbol&gt;´&lt;/FONT&gt; 320 m installed in Assis, SP, Brazil. Samples collected at five points within the toposequence were used to determine the soil macroporosity by means of image analyses, estimated total porosity, chemical analysis, particle size distribution analysis and soil water retention. From the summit down to the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brazilian savanna; Soil porosity; Soil water flow; Soil physical quality; Toposequence.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000400005

Crescimento in vitro de progênies de Eucalyptus camaldulensis Dehn. sob condições de deficiência hídrica
Provedor de dados: 63
Autores: Souza,Gustavo Maia; Gonçalves,Antonio Natal; Machado Neto,Nelson Barbosa.
Três procedências de Eucalyptus camaldulensis foram submetidas a deficiência hídrica induzida in vitro através da adição de 100, 400 e 1000 mM de sorbitol ao meio de cultura. As gemas foram avaliadas de acordo com seu crescimento em altura, produção de matéria seca, porcentagem de umidade e proteínas totais em eletroforese de gel de poliacrilamida. Observou-se uma relação inversa entre o crescimento em altura, que sofreu redução com o aumento do deficit hídrico, e a produção de matéria seca. Houve um aumento geral do conteúdo de proteínas totais em relação a redução do potencial osmótico do meio de cultura e a expressão diferenciada de duas proteínas de 36 e 45 quilodaltons (kDa).
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Eucalyptus camaldulensis; Deficiência hídrica; Crescimento; Proteínas; Cultura de tecidos.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000300007

Carbon pool ratios as scientific support to field morphology in the differentiation of dark subsurface soil horizons
Provedor de dados: 63
Autores: Toma,Maíra Akemi; Owens,Phillip Ray; Silva,Carlos Alberto; Silva,Sérgio Henrique Godinho; Silva,Elen Alvarenga; Curi,Nilton.
In soil surveys, it is usual to find profiles with an uncommon disposition of horizons. Dark horizons in depth might be either the consequence of erosion and redeposition of soil materials from upslope or an indication of the podzolization process, which forms a spodic horizon. Few laboratory analyses are known to characterize dark subsurface horizons which could allow for the differentiation of spodic from buried A horizons. Some researchers propose C-humic and C-fulvic acid fraction ratios and forms of carbon to analyze characteristics of these horizons. Therefore, this research aimed to characterize dark subsurface horizons found in soils under a Eucalyptus minimum tillage system in the state of Rio Grande do Sul, Brazil, and to relate soil organic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Humic substances; Organic matter; Erosion; Podzolization; Redeposition.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162015000400334

Qualidade da irrigação controlada por tensiômetros em pivô central
Provedor de dados: 63
Autores: Saad,A.M.; Libardi,P.L.
A qualidade da irrigação foi avaliada durante a safra de inverno do ano de 1988 na cultura do feijoeiro (Phaseolus vulgaris L.), irrigado por pivô central, em área de ocorrência de Latossolo Roxo (A moderado, textura argilosa a muito argilosa, distrófico), em Guaíra, SP. Os critérios utilizados para esta avaliação foram a eficiência do uso da água pela cultura e a efetividade da irrigação, esta última representada pela eficiência de aplicação da água, a uniformidade de distribuição da água sobre o solo e a eficiência de armazenagem da água no solo. O monitoramento das irrigações foi realizado através da instalação de 20 baterias de tensiômetros e 60 coletores de água de chuva e irrigação ao longo de uma transeção de 300 metros na direção radial do pivô. Os...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Efetividade da irrigação; Tensiômetro; Pivô central; Feijão.
Ano: 1994
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000300029

COMPORTAMENTO DE CLONES DE MANDIOCA EM RELAÇÃO A INFESTAÇÃO POR Neosilba perezi  (Romero &amp;amp; Ruppell) ( DIPTERA: LONCHAEIDAE)
Provedor de dados: 63
Autores: Lourenção,A.L.; Lorenzi,J.O.; Ambrosano,G.M.B.
Avaliou-se o comportamento de doze cultivares de mandioca de mesa e de dez de indústria em relação à infestação da broca-dos-brotos Neosilba perezi em dois experimentos conduzidos na Estação Experimental de Pariquera-Açu, SP, no ano agrícola 1991/92. A infestação foi avaliada aos quatro meses após a brotação das manivas. Nos dois grupos de mandioca observou-se variações entre os cultivares para resistência a N. perezi. Entre os cultivares de mesa, o mais resistente (IAC 289-70) apresentou média de 0,25 broto broqueado por planta enquanto o mais suscetível (F 4015) teve 2,40. Os cultivares SRT 1140 - Vassourinha amarela, F 5141 e IAC 576-70 tiveram médias inferiores a 1 broto broqueado por planta e não diferiram do IAC 289-70, podendo também ser...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Insecta; Neosilba perezi; Resistência varietal; Mandioca; Ganaspis pelleranoi; Broca-dos-brotas.
Ano: 1996
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161996000200019

Economic viability of the piauçu Leporinus macrocephalus (Garavello &amp;amp; Britski, 1988) production
Provedor de dados: 63
Autores: Takahashi,Leonardo Susumu; Gonçalves,Flavio Daolio; Abreu,Janessa Sampaio de; Martins,Maria Inez Espagnoli Geraldo; Ferreira,Antonio Carlos Manduca.
Brazilian fish farms presented an accelerated development during the early 90's, mainly because of the increase in fee-fishing operations. To meet the demand of this market, fish production and supply became excessive and, as a consequence, the number of fee-fishing operations, farmers and the final selling price, decreased. This study analyzes the technical aspects, production cost, profitability and economic viability of the production of piauçu (L. macrocephalus) in ponds, based on information from a rural property. Feeding and fingerling costs amount to approximately 47.1% of the total production cost, representing together with the final selling price the most important factor affecting profitability. The payback period was 8.3 years, the liquid...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Costs; Profitability; Economic analysis; Sensitivity analyses; Fish farming.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000200017

Phenology and morphological diversity of sweet potato (Ipomoea batatas) landraces of the Vale do Ribeira
Provedor de dados: 63
Autores: Veasey,Elizabeth Ann; Silva,Jurema Rosa de Queiroz; Rosa,Mariana Silva; Borges,Aline; Bressan,Eduardo de Andrade; Peroni,Nivaldo.
The phenotypic diversity of sweet potato (Ipomoea batatas) landraces was assessed using morphological traits, verifying how this diversity is distributed among the households and settlements of the Vale do Ribeira, Brazil. A total of 74 accessions, involving 53 landraces, collected from 30 households distributed among 18 settlements that practice traditional agriculture in the municipalities of Iguape, Ilha Comprida, and Cananeia, as well as four commercial varieties acquired in markets of Iguape and Piracicaba, were evaluated under an ex situ experimental condition in Piracicaba, SP, Brazil. Nine phenological and floral descriptors, nine morphological vegetative aerial descriptors and five storage root traits were recorded. The 14 aerial vegetative and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Local varieties; Morphology; Phenotypic diversity; Traditional agriculture; Variability.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000400013

Growing broccoli under salinity: the influence of cultivar and season on glucosinolates content
Provedor de dados: 63
Autores: Rios,Juan J.; Agudelo,Agatha; Moreno,Diego A.; Carvajal,Micaela.
ABSTRACT: The evaluation of factors that affect glucosinolates (GLS) concentrations in the roots, leaves, and inflorescence of broccoli plants is important in the improvement of the concentration of bioactive compounds and thus in the enhancement of the nutritional properties. In this work, the yield and the concentration of GLS of seven broccoli cultivars (Brassica oleracea var. italica) grown under salinity in field conditions were studied during three different seasons (autumn, winter, and spring). The results show that, generally, salinity did not alter significantly the inflorescence yield during any of the seasons, indicating a high tolerance of the cultivars tested. Yield was reduced only in cultivar Gea in autumn and in cultivar Parthenon in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cinnamoyl-indol-GLS; Water relations; Inflorescence yield; Mineral nutrients.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000601302

Eucalyptus Subgenus Symphyomyrtus: Sections: Exsertaria, Latoangulatae and Maidenaria
Provedor de dados: 63
Autores: Scanavaca Júnior,Laerte; Garcia,José Nivaldo.
ABSTRACT: Eucalypts are the most planted hardwood in the world, with 30 million ha. under cultivation. There are approximately 700 species of eucalypts, but more than 90 % of the plantations are concentrated in nine species of the Subgenus Symphyomyrtus in the Sections Exsertaria, Latoangulatae and Maidenaria. Since 2000, with the advancement of biotechnology, many species have been reclassified and regrouped according to their morphological and physiological characteristics, DNA structure and geographic distribution. This work had as its objective the formulation of a critical analysis which presents the main characteristics that will identify the species of Eucalyptus of these new sections. The species are classified mainly according to geographic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Eucalyptus; Connexentes; Transversae; Globulares; Viminales.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000701001

Quantity and quality of soil organic matter as a sustainability index under different land uses in Eastern Amazon
Provedor de dados: 63
Autores: Signor,Diana; Deon,Magnus Dall’Igna; Camargo,Plínio Barbosa de; Cerri,Carlos Eduardo Pellegrino.
ABSTRACT: Soil organic matter (SOM), which influences chemical, physical and biological soil attributes, is the main form of C found in the soil which can also be used as a soil sustainability index. The aim of this study was to use the quantity and quality of SOM as an indicator to determine the sustainability of different land uses (native vegetation, secondary vegetation, fruit orchards, horticultural areas, degraded pasture, improved pasture, and fields with annual crops) in the eastern Amazon. Improved pasture had higher soil C stock than the other land uses and was similar to the native vegetation, and also presented the highest quantity of C in a stable form in the soil (fraction &lt; 53 μm). According to the C management index, improved pasture is...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: C stocks; Changes in land use; Physical fractionation; Carbon management index; Microbial biomass.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162018000300225

Geostatistics as a basis to the CMLS pesticide simulation model with validation in soil columns
Provedor de dados: 63
Autores: Nicolella,Gilberto; Perez Filho,Archimedes; Souza,Manoel Dornelas de; Ferracini,Vera Lúcia.
The use of simulation models is probably the most efficient means for predicting the behavior of pesticides in the soil-plant-water system. The CMLS (Chemical Movement in Layered Soils) simulation model for predicting the fate of pesticides was used for studying the behavior of tebuthiuron, a herbicide used in sugar cane crops, from a sampling grid with 111 sampling points 200 m apart from one another and encompassing three types of soil: Ustic Quartzipsamment, Rhodic Hapludox and Typic Hapludox, all with medium and clay textures. The 373 points assessed by the simulator, generated from samples coming from the original grid and through the geostatistical methods of variography and ordinary kriging, returned the depth values reached by the herbicide after...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Microbasin; Sugar cane; Tebuthiuron; Variography; Kriging.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000100010

Nota do editor
Provedor de dados: 63
Autores: Reichardt,Klaus.
Tipo: Info:eu-repo/semantics/article
Ano: 1994
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000300001

Carbon stock and humification index of organic matter affected by sugarcane straw and soil management
Provedor de dados: 63
Autores: Segnini,Aline; Carvalho,João Luís Nunes; Bolonhezi,Denizart; Milori,Débora Marcondes Bastos Pereira; Silva,Wilson Tadeu Lopes da; Simões,Marcelo Luiz; Cantarella,Heitor; Maria,Isabella C. de; Martin-Neto,Ladislau.
The maintenance of sugarcane (Saccharum spp.) straw on a soil surface increases the soil carbon (C) stocks, but at lower rates than expected. This fact is probably associated with the soil management adopted during sugarcane replanting. This study aimed to assess the impact on soil C stocks and the humification index of soil organic matter (SOM) of adopting no-tillage (NT) and conventional tillage (CT) for sugarcane replanting. A greater C content and stock was observed in the NT area, but only in the 0-5 cm soil layer (p &lt; 0.05). Greater soil C stock (0-60 cm) was found in soil under NT, when compared to CT and the baseline. While C stock of 116 Mg ha-1 was found in the baseline area, in areas under CT and NT systems the values ranged from 120 to 127...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Laser-Induced Fluorescence Spectroscopy; Sugarcane replanting; Crop residues; No-tillage; Soil organic matter.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162013000500006

Capacity of the mechanical harvesting process of sugar cane billets
Provedor de dados: 63
Autores: Peloia,Paulo Rodrigues; Milan,Marcos; Romanelli,Thiago Libório.
The mechanized harvest of sugar cane (Saccharum officinarum L.) in Brazil is an irreversible trend and it comes with a great concern about the quality of the cane delivered to the industry. A key component to quality is the billet length which affects the processing of raw material, cane deterioration, invisible losses and load density of transport vehicles. Thus, due to the importance of the billet standard in quality and cost of raw material, this study aimed to evaluate if the mechanized harvesting of sugar cane can supply the quality requirements for the crushing process, regarding the billet length. A plot with burnt sugar cane (3.2 ha) and another one with green sugar cane (8.0 ha) were selected to be harvested by two (2) self-propelled sugar cane...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mechanization; Sugar cane harvester; Statistical process control.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000600001

Frutos de goiaba (Psidium guayava L.): desenvolvimento e extração de nutrientes
Provedor de dados: 63
Autores: Haag,H.P.; Monteiro,F.A.; Wakakuri,P.Y.
Em um pomar de goiabeira implantado em um solo Podzolizado de Lins e Marília variação Lins, situado no Município de Aliança, SP, foram coletados frutos desde os 15 dias até os 90 dias de idade, com intervalos de 15 dias, nas variedades de mesa Okawa n° 2, Pedro Sato e Kumagai. O frutos foram secados, pesados e analisados para todos os macronutrientes e para os micronutrientes B, Cu, Fe, Mn e Zn. As variedades Pedro Sato e Kumagai tiveram peso máximo dos frutos aos 60 dias e exportaram maiores quantidades dos nutrientes que a variedade Okawa n° 2, que teve peso máximo dos frutos aos 75 dias. Nas três variedades a exportação dos macronutrientes por planta e por unidade de área obedeceu a seguinte ordem crescente: Mg, Ca, P, S, N e K. Entre os micronutrientes...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Psidium guayava; Exportação de nutrientes; Variedade Okawa n° 2; Variedade Pedro Sato; Variedade Kumagai; Desenvolvimento de fruto.
Ano: 1993
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161993000300013

Soil preparation and nutrient losses by erosion in the culture cucumber
Provedor de dados: 63
Autores: Amaral Sobrinho,Nelson Moura Brasil do; Mazur,Nelson.
Minimum tillage reportedly reduce erosion, avoid soil degradation and improve crop productivity. This study aimed to determine how tillage operations may affect either nutrient accumulation or nutrient losses by erosion. The study was, carried out from December, 2000 to March, 2001, in the watershed of the Caetés River, in Rio de Janeiro State, Brazil (22º25'43"S, 43º25'07"W). The experiment was set up in sandy clay Kandiudult soil, 60% slope, under cucumber (Cucumis sativus L.) crop. Soil samples were collected before planting and after harvest, on 22.0 X 4.0 m Greeoff plots. After each rainfall, fine sediments carried by runoff were deposited into two collecting tanks in a row, installed at the end of each plot, and were later dried, weighed and stored...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Watershed of the Caetés; Fractionation of P; Losses due to erosion.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000600010

Suplementação da dieta de alevinos de piauçu (Leporinus obtusidens) com vitamina C
Provedor de dados: 63
Autores: Mello,Ricardo Frankein de; Moura,Mônica Acca Marcondes de; Vieira,Ivan; Cyrino,José Eurico Possebon.
O experimento teve como objetivo avaliar a influência da suplementação de vitamina C na dieta sobre o desempenho de alevinos de piauçu (Leporinus obtusidens). Um primeiro ensaio (105 dias) testou o efeito da suplementação de níveis crescentes de L-ácido ascórbico (0, 50, 150, 250, 350, 450, 550, 650, 750 e 850 mg/kg) na dieta sobre ganho de peso e sobrevivência, num delineamento inteiramente ao acaso. Não houve diferenças significativas (P &gt; 0,4054) entre os tratamentos, tanto para ganho de peso como sobrevivência. Num segundo ensaio avaliou-se a influência da vitamina C na resistência dos alevinos à hipoxia. Grupos de dez peixes aleatoriamente selecionados de cada tratamento do primeiro ensaio foram estocados em gaiolas, num delineamento em blocos ao...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Leporinus obtusidens; Nutrição; Vitamina C; Estresse.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000500026

Protein to energy ratios and cost, performance, and ammonia excretion in juvenile jundiá (Rhamdia quelen), South American catfish
Provedor de dados: 63
Autores: Freitas,Luiz Eduardo Lima de; Silva,Tarcila Souza de Castro; Fracalossi,Débora Machado.
ABSTRACT: The determination of nutritional requirements, based on diets administered in practice, considers physiological specificities and sustainability are essential to the development of suitable aquaculture technologies for novel fish species. The growth of jundiá (Rhamdia quelen Quoy and Gaimard) juveniles (31.54 ± 4.92 g) fed five diets comprising increasing levels of digestible protein (DP: 24, 29, 34, 39, and 44 %) and digestible energy (DE: 12.13, 13.39, 13.81, 14.64, and 15.06 MJ kg−1) with DP:DE ratios: 20, 22, 25, 27, and 29 g MJ−1, respectively, was evaluated. Each diet was fed to three groups of 25 fish for 75 days. Regression analysis showed that the different DP:DE ratios affected both growth and economic performance as well as excretion...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: DP:DE; Nutritional requirements; Nitrogen excretion; Practical diets.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000700402

Modelling beef cattle production systems from the Pampas in Brazil to assess intensification options
Provedor de dados: 63
Autores: Lampert,Vinícius do Nascimento; Canozzi,Maria Eugênia Andrighetto; McManus,Concepta Margaret; Dill,Matheus Dhein; Oliveira,Tamara Esteves de; Mercio,Thomaz Zara; Teixeira,Odilene de Souza; Barcellos,Júlio Otávio Jardim.
ABSTRACT Traditional livestock productivity is hard to estimate, since it depends on a gamut of animal production indicators that are difficult to measure for many farms. Thus, we propose an analytical method for estimating productivity and understanding the importance of animal production indicators under different full-cycle cattle production systems in Brazil. To evaluate the impact of these indicators, equations were derived from a comutational model of herd evolution for estimating the output parameters of the system as follows: productivity per hectare (PH) and offtake rate (COR), as a function of the indicators; calving rate (CR), mating age (AM), age of slaughter (AS) and stocking rate (SR). For this analysis, twenty-seven scenarios (simulation...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Adoption of technology; Animal production; Management; Stocking rate.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000400502

ESTUDO DO PRIMEIRO CICLO PRODUTIVO DA BANANEIRA `NANICÃO' (Musa sp.) DESENVOLVIDA  A PARTIR DE DIFERENTES TIPOS DE MUDA
Provedor de dados: 63
Autores: SCARPARE FILHO,J.A.; MINAMI,K.; KLUGE,R.A.; TESSARIOLI NETO,J.
Para avaliar o primeiro ciclo produtivo de bananeira `Nanicão' foram utilizados 5 tipos de muda: "chifrinho" e "chifrão" (brotações laterais com folhas lanceoladas), "guarda-chuva" (brotações separadas da planta mãe, com folhas normais), pedaços de rizoma e mudas micropropagadas. Foram avaliados o peso dos cachos, o número de pencas, o número de frutos por cacho e número de dias decorridos do plantio até a colheita. Os melhores desempenhos foram obtidos com as mudas "chifrinho" e "chifrão", que apresentaram maior equilíbrio das variáveis estudadas. As mudas constituidas de pedaços de rizoma, embora com uma produção alta, mostraram-se tardias no primeiro ciclo. O pior desempenho foi verificado nas mudas micropropagadas, com produções inferiores aos demais...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Propagação; Cultura de tecido; Variação somaclonal; Banana.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000100015

Propriedades funcionais-digestivas e nutricionais de polpa-refinada de maçã
Provedor de dados: 63
Autores: Raupp,Dorivaldo da Silva; Carrijo,Kelly Cristina Rebonato; Costa,Léa Luzia Freitas; Mendes,Sandra Denise Camargo; Banzatto,David Ariovaldo.
Propriedades funcionais-digestivas e nutricionais da polpa-refinada-desidratada de maçã (PRM) foram avaliadas em ratos Wistar, tendo como padrão de fibra o farelo de trigo (FT). A PRM apresentou 91,91% de fibra alimentar/dietária, mais que o dobro do FT (43,69%), sendo 82,27% de fração insolúvel e 9,64% da fração solúvel; 8,20% de proteínas; 0,57% de lipídeos; 2,04% de cinzas (minerais); e ausência de carboidratos digestíveis. A incorporação na dieta dos ratos de PRM ou do padrão FT em proporções de 5%, 15% ou 25% produziu, nos animais, efeitos funcionais-digestivos e nutricionais próprios de fibra alimentar insolúvel. Na concentração de 5% (PRM e FT forneceram 4,6% e 2,2% de fibra alimentar, respectivamente) as duas fontes de fibra produziram, com exceção...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Maçã; Polpa-refinada; Fibra alimentar/dietária; Farelo de trigo.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000300004

Infestation of froghopper nymphs changes the amounts of total phenolics in sugarcane
Provedor de dados: 63
Autores: Silva,Rafael José Navas da; Guimarães,Eduardo Rossini; Garcia,José Francisco; Botelho,Paulo Sérgio Machado; Ferro,Maria Inês Tiraboschi; Mutton,Miguel Angelo; Mutton,Márcia Justino Rossini.
The increased rate of sugarcane harvest without previous burn has provided a very favorable environment to the froghopper Mahanarva fimbriolata (Stal, 1854), with high moisture and low temperature variation. Few works have studied the response of sugarcane to this pest, so little is known about resistant cultivars. Plant phenolics are widely studied compounds because of their known antiherbivore effect. This research aims to determine if the attack of M. fimbriolata nymphs stimulates the accumulation of total phenolics in sugarcane. The experiment was carried out in greenhouse and arranged in completely randomized design, in a 3 X 2 X 4 factorial with three replications. Second instar nymphs of M. fimbriolata were infested at the following rates: control,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Saccharum spp; Phenolic compounds; Secondary metabolism; Plant-insect interaction.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000600005

Farmer rationality and the adoption of greening practices in Poland
Provedor de dados: 63
Autores: Świtek,Stanisław; Sawinska,Zuzanna.
ABSTRACT Common Agricultural Policy (CAP) reform in the European Union introduced a new element: greening. The aim of greening is to support the environment and create non-productive value in agriculture. The main element of greening is the Ecological Focus Area (EFA) meaning that a portion of farmland area has to be designed for environmental purposes. This article consists of an evaluatation of greening and its elements in the first year CAP reform has come into force. Surveys were used as a tool to gather information about farm characteristics, ways to meet greening requirements as well as the opinions of farmers as to changes in direct subsidies and greening obligations. The research was conducted in 2015 directly interviewing 290 farmers from the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: CAP; EFA; Agriculture; Farm management; Farmer survey.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162017000400275

ESTABELECIMENTO IN VITRO DE PORTA-ENXERTOS DE VIDEIRA  ATRAVÉS DE ÁPICES MERISTEMÁTICOS E SEGMENTOS NODAIS
Provedor de dados: 63
Autores: BIASI,L.A.; PASSOS,I.R. DA S.; POMMER,C.V.
Visando aumentar a eficiência de estabelecimento in vitro dos porta-enxertos de videira `Jales' e `Campinas', foram conduzidos alguns experimentos com ápices meristemáticos e segmentos nodais, retirados de brotações de estacas lenhosas. Foram testadas diversas concentrações de 6-benzilaminopurina (BAP) em meio de cultura MS com a metade da concentração de sais. O efeito desta citocinina foi marcante sobre o crescimento dos explantes. O aumento da concentração de BAP estimulou o crescimento e expansão foliar dos ápices meristemáticos e das gemas axilares até a concentração de 10µM. O uso de 20µM de BAP reduziu o crescimento dos segmentos nodais. Conclui-se que o estabelecimento dos porta-enxertos pode ser realizado em meio MS, com a metade da concentração...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cultura de tecidos; Estabelecimento; Porta-enxertos de videira; Citocinina.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000200005

Mineralogical characterization of a highly-weathered soil by the Rietveld Method
Provedor de dados: 63
Autores: Brinatti,André Maurício; Mascarenhas,Yvonne Primerano; Pereira,Vitor Paulo; Partiti,Carmen Silvia de Moya; Macedo,Álvaro.
The mineralogical characterization through mineral quantification of Brazilian soils by X-ray diffraction data using the Rietveld Method is not common. A mineralogical quantification of an Acric Ferralsol from the Ponta Grossa region, state of Paraná, Brazil, was carried out using this Method with X-Ray Diffraction data to verify if this method was suitable for mineral quantification of a highly-weathered soil. The A, AB and B3 horizons were fractioned to separate the different particle sizes: clay, silt, fine sand (by Stokes Law) and coarse sand fractions (by sieving), with the procedure free of chemical treatments. X-ray Fluorescence, Inductively Coupled Plasma Atomic Emission Spectrometry, Infrared Spectroscopy and Mössbauer Spectroscopy were used in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Acric Ferralsol; Clay fraction; Silt fraction; Mineralogical quantification; X-ray diffraction.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000400013

Effect of dietary protein and genetic line of Litopenaeus vannamei on its hepatopancreatic microbiota
Provedor de dados: 63
Autores: Martinez-Porchas,Marcel; Vargas-Albores,Francisco; Casillas-Hernández,Ramón; Rodriguez-Anaya,Libia Zulema; Lares-Villa,Fernando; Magdaleno-Moncayo,Dante; Gonzalez-Galaviz,Jose Reyes.
ABSTRACT: Host genetics and diet can exert an influence on microbiota and, therefore, on feeding efficiency. This study evaluated the effect of genetic line (fast-growth and high-resistance) in Pacific white shrimp ( Litopenaeus vannamei ) on the hepatopancreatic microbiota and its association with the feeding efficiency in shrimp fed with diets containing different protein sources. Shrimp (2.08 ± 0.06 g) from each genetic line were fed for 36 days with two dietary treatments (animal and vegetable protein). Each of the four groups was sampled, and the hepatopancreatic metagenome was amplified using specific primers for the variable V4 region of the 16S rRNA gene. The PCR product was sequenced on the MiSeq platform. Nineteen bacterial phyla were detected,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Shrimp genetic line; Fishmeal replacement; Productive response; Feeding efficiency.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000600403

Doses de fósforo, épocas de coleta e o crescimento e diagnose nutricional nos capins braquiária e colonião
Provedor de dados: 63
Autores: Rossi,Carla; Monteiro,Francisco Antonio.
Foram realizados dois experimentos em solução nutritiva, um com capim-braquária (Brachiaria decumbens Stapf) e outro com capim-colonião (Panicum maximum Jacq. cv. Colonião), no período de primavera-verão. Cada experimento constou de um fatorial 3 X 10, no qual foram estudadas três doses de fósforo (3,1; 15,5 e 31,0 mg L-1) e 10 épocas de coleta das plantas. O delineamento adotado foi o de blocos completos ao acaso, com quatro repetições. Aos 10 dias após o início do uso das soluções nutritivas completas, iniciou-se a coleta das plantas, a qual foi repetida a cada três dias. A interação entre doses de fósforo e épocas de coleta foi significativa (P&lt;0,05) para a produção de matéria seca e a concentração de fósforo nos dois capins e para a atividade da...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brachiaria decumbens; Panicum maximum; Concentração de fósforo; Fosfatase ácida.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000500011

Erratum
Provedor de dados: 63
Tipo: Info:eu-repo/semantics/report
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000200019

Crude glycerin in co-composting with laying hen manure reduces N losses
Provedor de dados: 63
Autores: Orrico Junior,Marco Antonio Previdelli; Orrico,Ana Carolina Amorim; Fava,Aldo Felipe; Sunada,Natália da Silva; Schwingel,Alice Watte; Garcia,Rodrigo Garófallo; Borquis,Rusbel Raul Aspilcueta.
ABSTRACT: The composting of laying hen manure is an efficient way of treating waste and producing an organic fertilizer with excellent characteristics; however, the high N losses reduce its concentration in the resulting fertilizer. Associating this residue with crude glycerin (CG) promotes a better C:N ratio and contributes to higher N retention during composting, with improvements in solids reduction and production of organic fertilizer with higher concentration of this nutrient. We carried out this research considering the hypothesis that adding CG – a byproduct of biodiesel production – to laying hen waste composting provides better N retention in the fertilizer generated. Increasing CG doses (0, 3, 6, 9, and 12 % in relation to the fresh mass in the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Windrows; Total solids; Volatile solids.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162018000500361

Agronomic and molecular characterization of wild germplasm Saccharum spontaneum for sugarcane and energycane breeding purposes
Provedor de dados: 63
Autores: Silva,Jorge Alberto Gonçalves da; Costa,Paulo Mafra de Almeida; Marconi,Thiago Gibbin; Barreto,Everton Jean da Silva; Solís-Gracia,Nora; Park,Jon-Won; Glynn,Neil Charles.
ABSTRACT: Among the species related to sugarcane, Saccharum spontaneum (L.) is a wild species with the greatest potential as a source of genetic variation to cope with biomass production in harsh environments. Due to its high yield, early vigor, ratooning ability, low input requirements and tolerance to various biotic and abiotic stresses, sugarcane breeders have shown interest in its contribution, as a donor of genes, to the development of high biomass energy canes. The conservation, evaluation and utilization of the genetic variability of S. spontaneum available in germplasm collections are critical for breeding, but, given the aggressive rhizomatous growth habit and the ability to propagate via seed dispersal, S. spontaneum is classified as a noxious...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Molecular markers; Yield; Bioenergy; Abiotic stress; Core collection.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162018000400329

Sweet pepper seed responses to inoculation with microorganisms and coating with micronutrients, aminoacids and plant growth regulators
Provedor de dados: 63
Autores: Diniz,Kênia Almeida; Silva,Paulo de Albuquerque; Oliveira,João Almir; Evangelista,José Renato Emiliorelli.
Small sized seeds, such as the horticultural species, have limited quantities of reserves that can be balanced by coating then with essential nutrients for their initial development. In addition, inoculation of the seeds with microorganisms may protect the plants against phytopathogens, thus enhancing their growth. The present work had the objective of evaluate the physiological quality and seedling development of sweet pepper seeds and seedlings coated with several kind of films. Seeds were first coated with polymers and then with antagonistic microorganisms (Trichoderma viride, Trichoderma polysporhum, Trichoderma stromaticum, Beauveria bassiana, Metarhizium anisopliae), mycorrhizas, aminoacids, micronutrients and plant growth regulators. Evaluation was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Capsicum annum; Film coating; Microbiolization.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000300002

Teor e distribuição da matéria orgânica em latossolos das regiões da floresta amazônica e dos cerrados do Brasil central
Provedor de dados: 63
Autores: TOGNON,A.A.; DEMATTÊ,J.L.I.; DEMATTÊ,J.A.M.
Com o principal objetivo de estudar as variações nos teores de matéria orgânica tanto em superfície como subsuperfície de latossolos das regiões da Amazônia e dos Cerrados, foi desenvolvido essa pesquisa com auxílio dos mapas de solos obtidos pelo projeto RADAMBRASIL, uma área abrangendo grande parte das regiões da Amazônia e dos Cerrados. Foram 78 perfis de Latossolo Amarelo e 184 de Latossolo Vermelho Amarelo na região Amazônica e 123 perfis de Latossolo Vermelho Amarelo e 121 de Latossolo Vermelho Escuro na região dos Cerrados. Os perfis foram grupados de acordo com as características climáticas, de vegetação e material de origem. Notou-se que o teor de matéria orgânica da região amazônica é maior nos horizontes superficiais. À medida que aumenta o teor...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Matéria orgânica; Latossolos; Amazônia; Cerrados; Cerrados.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000300001

Unidade Haugh como medida da qualidade de ovos de galinha armazenados sob refrigeração
Provedor de dados: 63
Autores: Alleoni,Ana Cláudia Carraro; Antunes,Aloísio José.
Durante o armazenamento, ocorrem alterações nas características físicas, químicas e funcionais das proteínas de ovos em cascas. Essas mudanças dependem das condições de armazenamento, como o tempo, a temperatura e a umidade relativa do ar. Neste trabalho, compararam-se os valores da unidade "Haugh" de ovos frescos e de ovos armazenados à temperatura ambiente (25°C) e à temperatura de refrigeração (8°C), durante 7, 14 e 21 dias de armazenamento. Os valores da unidade "Haugh" e da altura da clara espessa diminuíram, consideravelmente, com o armazenamento à temperatura de 25°C. No ambiente refrigerado, não houve diferença significativa na unidade "Haugh", nos períodos de armazenamento, mas seus valores foram menores do que obtidos para ovos frescos. O peso...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ph do albume; Peso do ovo; Altura do albume; Armazenamento de ovos.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000400005

Polyphasic analysis of Acidovorax citrulli strains from northeastern Brazil
Provedor de dados: 63
Autores: Silva,Kirley Michele Marques; Xavier,André Silva; Gama,Marco Aurélio Siqueira; Lima,Nelson Bernardi; Lyra,Maria do Carmo Castanho Pereira; Mariano,Rosa Lima Ramos; Souza,Elineide Barbosa.
ABSTRACT Bacterial fruit blotch (BFB) of cucurbit plants is caused by Acidovorax citrulli and represents a serious concern to melon (Cucumis melo L.) growers worldwide, including those in Brazil. Thirty-four A. citrulli strains from different melon production areas of northeastern Brazil were characterized for their virulence on melon fruits and their substrate utilization and molecular profiles. Based on the analysis of BFB severity on melon fruits, the A. citrulli strains were divided into three groups, classified as mildly, moderately or highly virulent. Although host-related groups were not observed, the watermelon and ‘melão-pepino’ strains exhibited only low or moderate virulence on melon fruit. Substrate utilization profiles revealed that 94 % of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cucumis melo; Bacterial fruit blotch; Variability.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000300252

Imputation of genetic composition for missing pedigree data in Serrasalmidae using morphometric data
Provedor de dados: 63
Autores: Costa,Adriano Carvalho; Balestre,Marcio; Botelho,Hortência Aparecida; Freitas,Rilke Tadeu Fonseca de; Gomes,Richardson Cesar da Silva; Campos,Sérgio Augusto de Sousa; Foresti,Fábio Porto; Hashimoto,Diogo Teruo; Martins,Diego Galetti; Prado,Fernanda Dotti do; Mendonça,Maria Andreia Corrêa.
ABSTRACT This study aimed to impute the genetic makeup of individual fishes of Serrasalmidae family on the basis of body weight and morphometric measurements. Eighty-three juveniles, belonging to the genetic groups Pacu, Pirapitinga, Tambaqui, Tambacu, Tambatinga, Patinga, Paqui and Piraqui, were separated into 16 water tanks in a recirculation system, with two tanks per genetic group, where they remained until they reached 495 days of age. They were then weighed and analyzed according to the following morphometric parameters: Standard Length (SL), Head Length (HL), Body Height (BH), and Body Width (BW). The identity of each fish was confirmed with two SNPs and two mitochondrial markers. Two analyses were performed: one for the validating the imputation...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Colossoma spp.; Piaractus spp.; Breeding; Mixture model; Round fish.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162017000600443

Trophic ecology of citrus pests based on stable isotope analysis
Provedor de dados: 63
Autores: Santi-Júnior,Adelino de; Botteon,Victor Wilson; Mastrangelo,Thiago; Moreira,Marcelo Zacharias.
ABSTRACT: Macrodactylus pumilio Burm. (Coleoptera: Scarabeidae) and Naupactus cervinus (Boh.) (Coleoptera: Curculionidae) are considered primary pests in citrus crops in Brazil, causing damage to plants and decreasing productivity. However, few studies investigate the ecology of these insects. In this context, the use of stable isotopes analysis (SIA) emerges as an alternative technique to conventional studies of behavioral ecology because it is faster and may explain feeding behavior based on the food source for each species. Field sampling and laboratory experiments were carried out to examine the changes of carbon and nitrogen stable isotope ratios (δ13C and δ15N) among pests and host plants (C3 citrus and C4 grasses), providing means to examine trophic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Macrodactylus pumilio; Naupactus cervinus; Δ13C; Δ15N.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162018000600504

Calibration and test of the cropgro-dry bean model for edaphoclimatic conditions in the savanas of Central Brazil
Provedor de dados: 63
Autores: Meireles,Elza Jacqueline Leite; Pereira,Antonio Roberto; Sentelhas,Paulo Cesar; Stone,Luis Fernando; Zimmermann,Francisco José Pfeilsticker.
Simulation models are important tools for the analysis of cultivated systems to estimate the performance of crops in different environments. The CROPGRO- model (DSSAT) was calibrated and validated using Carioca bean (Phaseolus vulgaris L.) to estimate yield and the development of the crop, sown in three row spacings (0.4, 0.5, and 0.6 m) and two fertilization rates (300 and 500 kg ha-1 of 4-30-16 N-P-K), in Santo Antônio de Goiás, GO, Brazil. To calibrate the model a combination of the genetic coefficients that characterize the phenology and morphology of the dry bean crop was used to obtain the best possible fit between predicted and observed anthesis and physiological maturity dates, leaf area index (LAI), total dry matter (TDM), yield components, and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: DSSAT; Dry bean; Simulation.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000400016

Nonlinear models to predict nitrogen mineralization in an Oxisol
Provedor de dados: 63
Autores: Pereira,Janser Moura; Muniz,Joel Augusto; Silva,Carlos Alberto.
This work was carried out to evaluate the statistical properties of eight nonlinear models used to predict nitrogen mineralization in soils of the Southern Minas Gerais State, Brazil. The parameter estimations for nonlinear models with and without structure of autoregressive errors was made by the least squares method. First, a structure of second order autoregressive errors, AR(2) was considered for all nonlinear models and then the significance of the autocorrelation parameters was verified. Among the models, the Juma presented an autocorrelation of second order, and the model of Broadbent presented one of first order. In summary, these models presented significant autocorrelation parameters. To estimate the parameters of nonlinear models, the SAS...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Autoregressive; Estimators properties; Mineralized nitrogen; Variance; Covariance matrices.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000400014

HYDROGRAPH SEPARATION OF THE AMAZON RIVER USING 18O AS AN ISOTOPIC TRACER
Provedor de dados: 63
Autores: MORTATTI,J.; MORAES,J.M.; RODRIGUES, JR,J.C.; VICTORIA,R.L.; MARTINELLI,L.A.
The 18O content of rain and river waters was used as an isotopic tracer in order to carry out the hydrograph separation of the Amazon river, during the 1973-1974 hydrological years, and to estimate the contributions of the surface runoff (event water) and baseflow (pre-event water) components to the total river flow. The average surface runoff and baseflow contributions were 30.3 and 69.7% respectively. At peak discharge, the mean contribution of the baseflow was about 57%. The results of the isotopic separation model were compared with the filter-separation autoregressive method, showing similar behavior and magnitude.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Isotopic tracers; Hydrograph separation; Amazon river.
Ano: 1997
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161997000200009

Quantificação de bactérias totais e esporuladas no solo
Provedor de dados: 63
Autores: Vieira,Francisco Cleber Sousa; Nahas,Ely.
Este trabalho analisou o efeito da temperatura e período de incubação e da diluição do inóculo, em dois meios de cultura, sobre a quantificação de bactérias totais e esporuladas. O crescimento quantitativo e qualitativo de bactérias totais e esporuladas depende tanto do meio de cultura, temperatura, diluição e tempo utilizados como da interação desses fatores. O meio de TSA apresentou maior contagem que o meio de Thorton de unidades formadoras de colônias (UFC) de bactérias totais mas não de Bacillus spp. As colônias crescidas no meio de TSA apresentaram maior tamanho e forma mais nítida. O cultivo à temperatura de 30°C propiciou maior número de UFC que a 25°C, sobretudo nos primeiros dias de incubação. O crescimento bacteriano correspondeu a uma equação...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bacillus spp.; Bactérias totais; Solo.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000300026

Genotypic variation of traits related to quality of cassava roots using affinity propagation algorithm
Provedor de dados: 63
Autores: Oliveira,Eder Jorge de; Santana,Fernanda Alves; Oliveira,Luciana Alves de; Santos,Vanderlei da Silva.
The conservation, sustainable evaluation and use of cassava (Manihot esculenta Crantz) genetic resources are essential to the development of new commercial varieties. This study aimed to evaluate the quality of cassava roots and to estimate genetic variation and clustering in cassava germplasm using the Affinity Propagation algorithm (AP), which is based on the concept of "message passing" between data points. AP finds "exemplars" of each group and members of the input set representative of clusters. The genotypic data of 474 cassava accessions were evaluated over a period of two years for starch yield (StYi), root dry matter (DMC), amylose content (AML), and the level of cyanogenic compounds (CyC). The AP algorithm enabled the formation of nine diversity...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Germplasm; Amylose content; Cyanogenic compounds; Yield.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162015000100053

Scientific and technical knowledge of sugarcane cover-management USLE/RUSLE factor
Provedor de dados: 63
Autores: Rocha,Gustavo Casoni da; Sparovek,Gerd.
ABSTRACT: Sugarcane covers 10.6 Mha of Brazilian agricultural land (13 % of all cropland), mainly in the south-central region. In tropical climate conditions, the physiological characteristics of sugarcane allow a wide range of management systems with contrasting soil erosion outcomes. Models can assess these differences and the Universal Soil Loss Equation (USLE) based models are the most frequently used. The cover-management factor (C Factor) is the USLE input variable that represents the changes in soil cover and management. We collected, compared, and evaluated sugarcane C Factor values reported in technical and scientific literature to support modelers and soil scientists on the adequate choice of these values. We analyzed references reporting primary...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bibliometric research; Modeling; Soil loss.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000701801

Genomic prediction of leaf rust resistance to Arabica coffee using machine learning algorithms
Provedor de dados: 63
Autores: Sousa,Ithalo Coelho de; Nascimento,Moysés; Silva,Gabi Nunes; Nascimento,Ana Carolina Campana; Cruz,Cosme Damião; Silva,Fabyano Fonseca e; Almeida,Dênia Pires de; Pestana,Kátia Nogueira; Azevedo,Camila Ferreira; Zambolim,Laércio; Caixeta,Eveline Teixeira.
ABSTRACT Genomic selection (GS) emphasizes the simultaneous prediction of the genetic effects of thousands of scattered markers over the genome. Several statistical methodologies have been used in GS for the prediction of genetic merit. In general, such methodologies require certain assumptions about the data, such as the normality of the distribution of phenotypic values. To circumvent the non-normality of phenotypic values, the literature suggests the use of Bayesian Generalized Linear Regression (GBLASSO). Another alternative is the models based on machine learning, represented by methodologies such as Artificial Neural Networks (ANN), Decision Trees (DT) and related possible refinements such as Bagging, Random Forest and Boosting. This study aimed to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hemileia vastatrix; Statistical learning; Plant breeding; Artificial intelligence.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000401102

Carbonate-silicate ratio for soil correction and influence on nutrition, biomass production and quality of palisade grass
Provedor de dados: 63
Autores: Souza,Renato Ferreira de; Ávila,Fabrício William; Faquin,Valdemar; Pozza,Adélia Aziz Alexandre; Carvalho,Janice Guedes; Evangelista,Antônio Ricardo.
Silicates can be used as soil correctives, with the advantage of being a source of silicon, a beneficial element to the grasses. However, high concentrations of silicon in the plant would affect the digestibility of the forage. To evaluate the influence of the substitution of the calcium carbonate by calcium silicate on the nutrition, biomass production and the feed quality of the palisade grass [Urochloa brizantha (C. Hochstetter ex A. Rich.) R. Webster], three greenhouse experiments were conducted in completely randomized designs with four replications. Experimental units (pots) contained a clayey dystrophic Rhodic Haplustox, a sandy clay loam dystrophic Typic Haplustox and a sandy loam dystrophic Typic Haplustox. Each soil received substitution...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Urochloa brizantha; Pasture; Lime; Silicon; Feed value.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000500003

Performance of non woven synthetic fabric and disc filters for fertirrigation water treatment
Provedor de dados: 63
Autores: Ribeiro,Túlio Assunção Pires; Paterniani,José Euclides Stipp; Airoldi,Rogério Pereira da Silva; Silva,Marcelo Jacomini Moreira da.
Obstruction of emitters caused by the presence of solid particles in the water raises the cost and maintenance of trickle irrigation systems, and might compromise their utilization. This research was performed through test fields, with the objective of evaluating the performance of a disc filter (130 microns) and a non woven synthetic fabric filter on the removal of physical, chemical and biological impurities from the irrigation water, which may cause emitter obstruction during fertirrigation processes. The evaluation criteria of the impurities present in the irrigation water, were based on studies performed on trickle irrigation systems. Specifically, physical, chemical and biological parameters analyzed in the inflow and outflow water from both filters...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dripper; Filtration; Water quality; Irrigation.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000200001

Fuzzy logic in automation for interpretation of adaptability and stability in plant breeding studies
Provedor de dados: 63
Autores: Carneiro,Anna Regina Tiago; Sanglard,Demerson Arruda; Azevedo,Alcinei Mistico; Souza,Thiago Lívio Pessoa Oliveira de; Pereira,Helton Santos; Melo,Leonardo Cunha.
ABSTRACT: The methods of Annicchiarico (1992) and Cruz et al. (1989) are widely used in phenotypic adaptability and stability analyses in plant breeding. In spite of the importance of these methodologies, their parameters are difficult to interpret. The aim of this research was to develop fuzzy controllers to automate the decision-making process employed by adaptability and stability studies following the methods adopted by Annicchiarico (1992) and Cruz et al. (1989) and check their efficiency using experimental data from common bean cultivars. Fuzzy controllers have been developed based on the Mamdani inference system proposed by these two methods of adaptability and stability studies. For the first fuzzy controller parameters were considered favorable...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Common bean; Genotype by environment interaction; Crop breeding; Computational intelligence.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162019001200123

Silicate and phosphate combinations for marandu palisadegrass growing on an oxisol
Provedor de dados: 63
Autores: Melo,Suzana Pereira de; Monteiro,Francisco Antonio; Manfredini,Daniel.
One of the greatest problems for pasture establishment and maintenance are the extremely low concentrations of available phosphorus in soils. The objective of this study was to evaluate the influences on productive and physiologic attributes during Marandu palisadegrass (Brachiaria brizantha) establishment, following changes in phosphorus availability in the soil through the applications of phosphate and silicate. To achieve this, a fractionated factorial 5² design was used, with 13 combinations for silicon and phosphorus, respectively, in mg dm-3: 150 and 10; 150 and 170; 150 and 330; 225 and 90; 225 and 250; 300 and 10; 300 and 170; 300 and 330; 375 and 90; 375 and 250; 450 and 10; 450 and 170 and 450 and 330, distributed according to randomized blocks,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brachiaria brizantha; Leaf area; Phosphorus; Production; Silicon.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000300010

Characterization of condensed tannins from native legumes of the Brazilian northeastern semi-arid
Provedor de dados: 63
Autores: Guimarães-Beelen,Patrícia Mendes; Berchielli,Telma Teresinha; Beelen,Roger; Araújo Filho,João; Oliveira,Simone Gisele de.
Despite the possible influence of tannins on the nutritional value of the forages from Caatinga vegetation, there are few studies that evaluated their tannin concentration. This study was conducted to characterize condensed tannins present in the legumes species Mimosa hostilis (Jurema Preta), Mimosa caesalpinifolia (Sabiá) and Bauhinia cheilantha (Mororó), at three stages of their phenological cycle. The concentration of soluble tannin (ST), bound tannin (BT) and total tannin (TT) were determined using the butanol-HCL method; astringency was by the radial diffusion method, and the monomeric composition of purified tannins by a high-performance liquid chromatograph with delphinidin, cyanidin and pelargonidin as standards. Concentration and astringency of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Proantocyanidin; Antinutritional factors; Native species; Ruminant.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000600002

Herbicide selectivity by differential metabolism: considerations for reducing crop damages
Provedor de dados: 63
Autores: Carvalho,Saul Jorge Pinto de; Nicolai,Marcelo; Ferreira,Renato Rodrigues; Figueira,Antonio Vargas de Oliveira; Christoffoleti,Pedro Jacob.
Herbicide selectivity is an agricultural technology largely exploited in chemical strategies of weed control. The joint action of several protection mechanisms avoids phytotoxicity from herbicide treatment, maintaining the level of agronomically accepted damage to a minimum, or even totally avoiding them. The major mechanism of herbicide selectivity derives from the differential metabolism between weed and crop plant species, with weeds presenting a limited ability to perform it under agronomically recommended conditions. In this case, phytotoxicity can be interpreted as an overcoming of the maximum protection capacity offered by the mechanisms of selectivity, or when considering metabolism as the main factor, the overcoming of the inherent plant ability...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phytotoxicity; Injuries; Yield; Experimental design; Crop management.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000100020

Temperature effect on CARBON biomass in soils FROM TROPICAL AND TEMPERATE REGIONS
Provedor de dados: 63
Autores: Vasconcellos,C.A.
Four soils from various origins, (tropical and temperate regions) were amended with 14C labelled glucose (1mg C.g-1 soil) and incubated at 15ºC and 35ºC to determine the temperature effect on the carbon turnover and on the microbial biomass. The temperature effect on the biomass increased with the glucose addition. The biomass mineralization rates were higher at 35ºC than at 15ºC and higher for Woburn and Pegwell soils (temperate region) than for Capinopolis and Janauba (tropical region). Specific respiration rate (SRR) of new biomass (from glucose) and old biomass showed different behaviors between soils. At 15ºC, the turnover C was 207, 225, 115 and 141 days for Janauba, Capinopolis, Woburn and Pegwell soil, respectively. At 35ºC, it was 92, 69, 69 and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Carbon biomass; Organic carbon; Soil; Temperature; Turnover.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000100016

The last giant Araucaria trees in southern Brazil
Provedor de dados: 63
Autores: Scipioni,Marcelo Callegari; Dobner Jr.,Mário; Longhi,Solon Jonas; Vibrans,Alexander Christian; Schneider,Paulo Renato.
ABSTRACT: Araucaria angustifolia (Bertol.) Kuntze is a native tree species of major importance in southern Brazil. It is a regional symbol due to its iconic shape and stature in the landscape; its wood was once economically important and its seeds are an important source of food for the fauna and are presently used in regional cuisine. Despite its importance and apparent abundance, the species is facing extinction mainly as a result of unregulated exploitation and deforestation. This study catalogued the remaining individuals in order to add to the body of knowledge available on A. angustifolia, a species that has become rare across its historic range. The circumference at breast height (1.30 m), the total height, and the tree volume were measured (3,529...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Giant tree; Large old tree; Monumental trees; Cavities trees; Araucaria forest.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162019001300220

Determinação indireta de N-total em plantas por espectrometria de absorção atômica com chama empregando uma mini-coluna de AgCl(s)
Provedor de dados: 63
Autores: Carneiro,Josiane Meire Tolotti; Zagatto,Elias Ayres Guidetti; Mattos,Ivanildo Luiz de; Melo,Denise.
Um sistema de análises químicas por injeção em fluxo empregando uma mini-coluna de AgCl(s) é proposto para a determinação de nitrogênio total em plantas por espectrometria de absorção atômica com chama. O método se baseia na remoção de íons Ag+ por amônia com formação do complexo diamino argentato(I) e posterior direcionamento da amostra a um espectrômetro de absorção atômica onde prata é monitorada. Nitrogênio foi determinado em sete amostras de referência (três replicatas) com precisão e exatidão comparáveis às do procedimento condutimétrico. O sistema é estável, apresentando apenas pequenas variações em sensibilidade (&lt; 2 %) durante períodos de operação de 4 horas. A velocidade analítica é de aproximadamente 100 h-1 e a repetibilidade das medidas é...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: N-total; Análise por injeção em fluxo; Espectrometria de absorção atômica; Mini-coluna.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000100023

In vitro rumen fermentation and effect of protein fractions of canola meals on methane production
Provedor de dados: 63
Autores: Ramirez-Bribiesca,Jacinto Efrén; McAllister,Tim; Ungerfeld,Emilio; Ortega-Cerrilla,María Esther.
ABSTRACT: Canola provides oil for human consumption and a by-product from the extraction of its oil canola meal (CM), is used as a good quality protein and lipid supplement for ruminants. The aim of this study was to determine the chemical composition and fermentation profile associated with the potential for methane production of three types of CM: solvent-extracted CM of Brassica napus (CMBN), B. juncea (CMBJ) and cold press-extracted CM from B. napus (CPCM) used to feed ruminants. The protein content of canola meal ranged from 36 to 41 %. The acid and neutral detergent insoluble in nitrogen ranged from 1 to 2 % and 4 to 5 %, respectively. The lipid content of canola meal samples ranged from 2 % (CMBN, CMBJ) to 14 % (CPCM). In vitro, dry matter...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brassica napus and juncea; Degradability; Ruminants.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162018000100012

How old are large Brazil-nut trees (Bertholletia excelsa) in the Amazon?
Provedor de dados: 63
Autores: Camargo,P.B. de; Salomão,R. de P.; Trumbore,S.; Martinelli,L.A.
The age of a large Brazil-nut tree (Bertholletia excelsa) is measured by radiocarbon dating, and a discussion is made about their importance in the Amazon rain-forest ecosystem.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amazon; Brazil-nut; Radiocarbon age.
Ano: 1994
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000200028

Organic trace minerals and calcium levels in broilers' diets to 21 days old
Provedor de dados: 63
Autores: Faria,Bruno Damaceno; Silva,Leandro Moreira; Ribeiro Junior,Valdir; Ferreira,Adriana Helena do Nascimento; Rostagno,Horacio Santiago; Albino,Luiz Fernando Teixeira; Hannas,Melissa Izabel.
ABSTRACT: This study was undertaken to evaluate the effects of dietary calcium levels and supplementation with organic trace minerals selenium, copper, iron, zinc and manganese on performance, tissue deposition and litter mineral concentration. A total of 2,496 one-day-old male Cobb 500 broilers were randomly assigned to a 3 × 4 factorial experimental design with three levels of dietary Ca [8, 10 and 12 g kg–1, while maintaining the same Ca:nPP (non-phytate phosphorus) ratio (2:1)] and four levels of micromineral supplementation (0.62, 0.72, 0.82 and 0.92 g kg–1). There was a total of 12 treatments, with eight replicates of 26 birds per pen. Micromineral supplementation (MS) was achieved by adding different levels of the product Bioplex TR Se® and Ca...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chicken; Micromineral; Tibia; Breast muscle.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000100401

Ozonated water and chlorine effects on the antioxidant properties of organic and conventional broccoli during postharvest
Provedor de dados: 63
Autores: Lima,Giuseppina Pace Pereira; Machado,Tatiana Marquini; Oliveira,Luciana Manoel de; Borges,Luciana da Silva; Pedrosa,Valber de Albuquerque; Vanzani,Paola; Vianello,Fabio.
There is growing interest in studies on sanitizers other than chlorine that can maintain the quality of organic products without affecting their phytochemical content. The effects of using chlorinated and ozonized water treatments, as sanitizing procedures, on the post-harvest quality of organic and conventional broccoli (Brassica oleracea L.) cv. Italica was evaluated. The biochemical parameters (chlorophyll, polyphenols, flavonoids, vitamin C and antioxidant capacity) of the broccoli samples were analyzed at day 0 (arrival of the plant from the field, original features), and 1, 4 and 7 days after harvest. The polyamine analysis was performed on arrival of the plant from the field and on the first and seventh days. The cultivation procedure influenced...
Tipo: Info:eu-repo/semantics/article
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162014000200010

Basic principles of graphing data
Provedor de dados: 63
Autores: Kozak,Marcin.
Data visualization is a very important aspect of data analysis and of presentation. Focusing on the latter, this paper discusses various elements of constructing graphs for publications. Bad and good graphs are compared, and a checklist with graphical elements to be used while creating graphs is proposed.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Visualization; Graphs; Statistics.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000400017

Stomatal responses of Eucalyptus species to elevated CO2 concentration and drought stress
Provedor de dados: 63
Autores: Lima,Walter de Paula; Jarvis,Paul; Rhizopoulou,Sophia.
Five species of Eucalyptus (E. grandis, E. urophylla, E. camaldulensis, E. torelliana, and E. phaeotrica), among the ten species most commonly used in large scale plantations, were selected for studies on the effects of elevated CO2 concentration [CO2] and drought stress on stomatal responses of 2.5-month old seedlings. The first three species belong to the subgenus Smphyomyrtus, whereas the fourth species belongs to the subgenus Corymbia and E. phaeotrica is from the subgenus Monocalyptus. Seedlings were grown in four pairs of open-top chambers, arranged to have 2 plants of each species in each chamber, with four replications in each of two CO2 concentrations: 350 ± 30 mumol mol-1 and 700 ± 30 mumol mol-1. After 100 days in the chambers, a series of gas...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Eucalyptus physiology; Water use efficiency; Drought tolerance; CO2 adaptation.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000200005

Soil phosphorus dynamics as affected by Congo grass and P fertilizer
Provedor de dados: 63
Autores: Rosolem,Ciro Antonio; Merlin,Alexandre; Bull,Júlio Cesar Longo.
Some plant species can change soil phosphorus (P) availability and this may be an important tool in managing tropical high fixing phosphorus soils. An experiment was conducted to evaluate phosphorus transformations in the soil and phosphatase activity during periods of Congo grass (Brachiaria ruziziensis, Germain et Evrard) growth in two tropical soils receiving 20, 40, 80, 160 mg dm-3 of inorganic P. Plants were grown for 84 days in 8-L pots. Acid phosphatase activity, P in the microbial mass, soil organic and inorganic P and P accumulation by Congo grass were evaluated. Phosphorus fertilization increased soil P availability, Congo grass yields and P accumulation in the plant. On average, less labile P forms in the soil were not changed by Congo grass;...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phosphatase; Soil fertility; Crop rotation; Brachiaria.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162014000400008

Yield-scaled global warming potential of two irrigation management systems in a highly productive rice system
Provedor de dados: 63
Autores: Tarlera,Silvana; Capurro,María Cristina; Irisarri,Pilar; Scavino,Ana Fernández; Cantou,Guillermina; Roel,Alvaro.
ABSTRACT Water management impacts both methane (CH4) and nitrous oxide (N2O) emissions from rice paddy fields. Although controlled irrigation is one of the most important tools for reducing CH4emission in rice production systems it can also increase N2O emissions and reduce crop yields. Over three years, CH4 and N2O emissions were measured in a rice field in Uruguay under two different irrigation management systems, using static closed chambers: conventional water management (continuous flooding after 30 days of emergence, CF30); and an alternative system (controlled deficit irrigation allowing for wetting and drying, AWDI). AWDI showed mean cumulative CH4 emission values of 98.4 kg CH4 ha−1, 55 % lower compared to CF30, while no differences in nitrous...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Greenhouse gases; Emissions; Methane; Nitrous oxide; Mitigation.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000100043

Soil structure and greenhouse gas production differences between row and interrow positions under no-tillage
Provedor de dados: 63
Autores: Silva,Alvaro Pires da; Ball,Bruce C.; Tormena,Cássio Antonio; Giarola,Neyde Fabiola Balarezo; Guimarães,Rachel Muylaert Locks.
No-tillage in Brazil is an efficient agricultural system that improves crop productivity whilst controlling erosion caused to the soil by degradation. However, there is some concern regarding soil compaction. Our objective was to determine whether the function of soil structure in sustaining crop growth was dependent on row and interrow positions in long-term no-tillage. We took soil samples from a field in a commercial farm under long-term no-tillage since 1979 on a clayey Oxisol in Southern Brazil. We assessed soil physical quality using the revised Peerlkamp technique and measured bulk density, air-filled porosity and air permeability of intact soil cores. Samples were incubated to assess in vitro N2O and CO2 production. The soil physical and structural...
Tipo: Info:eu-repo/semantics/article
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162014000200011

Genótipos de milho com alta capacidade para embriogênese somática e regeneração de plantas obtidos a partir de calos
Provedor de dados: 63
Autores: Santos-Serejo,Janay Almeida dos; Aguiar-Perecin,Margarida L. R. de.
Como parte de um programa que visa a seleção de linhagens adaptadas a regiões tropicais, com a capacidade para regenerar plantas a partir de calos embriogênicos de curta duração, foram investigadas três linhagens obtidas a partir de uma variedade de milho tipo flint, e seus respectivos híbridos. As culturas foram obtidas a partir de embriões imaturos inoculados em meio N6 suplementado com 1,5 mg L-1 de 2,4-D e prolina 12 mM. A frequência de calos embriogênicos 45 dias após o início da cultura foi semelhante aos melhores genótipos descritos na literatura (83-99%), refletindo a alta qualidade dos genótipos testados para o estabelecimento de culturas de curta duração. O número médio de plantas férteis regeneradas em culturas com 2-3 meses de idade variou de 2...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Milho; Cultura de tecido; Embriogênese somática; Regeneração.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000400019

Water deficit in relation to leaf and stem anatomy of Eucalyptus camaldulensis Dehn. shoots cultivated in vitro
Provedor de dados: 63
Autores: Souza,Gustavo Maia; Gonçalves,Antonio Natal; Almeida,Marcílio de.
Shoots of E. camaldulensis seedlings from three distinct provenances were submitted to three different levels of in vitro water deficit induced by the addition of sorbitol in the growth media. Transversal sections from the leaf blades and stems were anatomically analysed using the historesin inclusion technique. Shoots from the different provenances presented distinct responses to the treatments. The Gilbert River provenance was the most sensible. The basic alterations found on the anatomical structure in response to the water deficit were: cell collapse, late tissue differentiation, vascular bundle and epidermis disorganization, and alterations on the mesophyll and epidermis thickness.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Eucalyptus camaldulensis; Water deficit; Anatomy; Tissue culture.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000300030

Waxes and plastic film in relation to the shelf life of yellow passion fruit
Provedor de dados: 63
Autores: Mota,Wagner Ferreira da; Salomão,Luiz Carlos Chamhum; Cecon,Paulo Roberto; Finger,Fernando Luiz.
The high perishability of the yellow passion fruit (Passiflora edulis f. flavicarpa) reduces its postharvest conservation and availability, mainly for in natura consumption. These losses of quality and commercial value occur due to the high respiration and loss of water. This work aimed to evaluate the influence of a modified atmosphere - wax emulsions and plastic film - on the shelf life of the yellow passion fruit. Plastic film (Cryovac D-955, 15 mum thickness) reduced fresh weight loss and fruit wilting, kept higher fruit and rind weight and higher pulp osmotic potential over the storage period. However, it was not efficient in the control of rottenness. Sparcitrus wax (22-23% polyethylene/maleyc resin) caused injury to the fruit, high fruit weight...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Passiflora edulis f. flavicarpa; Water loss; Modified atmosphere.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000100008

Soil compaction and fertilization in soybean productivity
Provedor de dados: 63
Autores: Beutler,Amauri Nelson; Centurion,José Frederico.
Soil compaction and fertilization affect soybean development. This study evaluated the effects of soil compaction and fertilization on soybean (Glycine max cv. Embrapa 48) productivity in a Typic Haplustox under field conditions in Jaboticabal, SP, Brazil. A completely randomized design with a 5 x 2 factorial layout (compaction vs. fertilization), with four replications in each treatment, was employed. Each experimental unit (replicate) consisted of a 3.6 m² useful area. After the soil was prepared by cultivation, an 11 Mg tractor passed over it a variable number of times to create five levels of compaction. Treatments were: T0= no compaction, T1= one tractor pass, T2= two, T4= four, and T6= six passes, and no fertilizer and fertilizer to give soybean...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bulk density; Penetration resistance; Fertilizer; Yield.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000600010

REDUÇÃO DA COPA DA MANGUEIRA
Provedor de dados: 63
Autores: Simão,Salim; Zamariolli,Luiz Eduardo.
O porte da mangueira, atinge normalmente a altura de 10 a 12 m e um diâmetro de 7 a 10 ou mais metros, dificultando os tratos culturais, fitossanitários e a colheita. A redução da copa da mangueira à metade de suas dimensões, leva a uma maior densidade de plantas por hectare, maior facilidade de tratos culturais de colheita e da poda dos ramos atacados pela seca da mangueira. Como consequência a produtividade também é maior. Com essa finalidade é apresentada a presente nota.
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Mangueira; Copa; Manejo.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000100032

‘URS Campestre’ seedless orange: a new mutant with female sterility
Provedor de dados: 63
Autores: Bender,Renar João; Santos,Rinaldo Pires dos; Guerra,Divanilde; Schwarz,Sergio Francisco; Bender,Stefan da Silveira.
ABSTRACT: Seedlessness in fruit is a trait that is much sought after by juice making industries. Close to the city of São Sebastião do Caí, in the state of Rio Grande do Sul (RS), Brazil, a new mutant orange originating from natural mutation was identified and selected as a seedless material. To determine the mechanisms involved in the absence of seeds, the reproductive structures of this new mutant by comparison with a Valencia sweet orange as control, a cultivar with a profusion of seeds, was analyzed in terms of meiotic behavior, meiotic index, pollen viability, in vitro germination, and ovule features to determine the grounds for seed absence. Other morphological analyzes allowed for visualizing the structures of normal appearance and size in both...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cytogenetic analysis; Embryo sac abortion; Female sterility; Meiotic analysis; Pollen viability.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162017000500371

Damage caused by capybaras in a corn Field
Provedor de dados: 63
Autores: Ferraz,Katia Maria Paschoaletto Michi de Barros; Lechevalier,Marrie-Anne; Couto,Hilton Thadeu Zarate do; Verdade,Luciano Martins.
Damage caused by capybaras in agroecossystems in Brazil has been frequently observed. The objective of this study was to describe and quantify the actual damage caused by capybaras in a corn field, aiming to get basic information on how, how much, and where these damage occur. Systematic sampling indicated that 26% of the planted area were damaged by capybaras, and the highest percentage of damage occurred on the border of the corn field (t=4.5698, p=0.0001). Damage in areas adjacent to a forest fragment was significantly higher (t=13.6198, p=0.0001), suggesting that the strategy of area utilization for feeding was related to the proximity of the resources "forest" and "water". Avoiding corn plantation in areas adjacent to forest fragments used by...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hydrochaeris hydrochaeris; GIS; Crop damage; Agroecossystems.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000100029

Novel set of real-time PCR primers for simultaneous detection of Liberibacter species associated with citrus Huanglongbing
Provedor de dados: 63
Autores: Orce,Ingrid Georgina; Sendín,Lorena Noelia; Marano,María Rosa; Vojnov,Adrián Alberto; Castagnaro,Atilio Pedro; Filippone,María Paula.
Huanglongbing (HLB), a devastating citrus disease caused by the bacterium “Candidatus Liberibacter spp.”, is now responsible for significant economic losses worldwide. Yet, no effective disease control has been found, and the non-cultivability of the bacterium has severely hampered studies on the pathogen. The 16S rDNA gene is a well-characterized sequence, essential for cell survival, and is used for bacterial identification or assignment of close relationships at the genus and species levels. Quantitative Real-Time PCR (qPCR) assays based on 16S rDNA genes are widely used in the detection of “Ca. Liberibacter spp.” in multiplex reactions. We have developed for the first time a set of qPCR primers based on the conserved 16S rDNA gene, which specifically...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Candidatus Liberibacter spp.; Syber Green qPCR; Argentina; Greening; Pathogen detection.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162015000300252

Correlations of visual scores, carcass traits, feed efficiency and retail product yield in Nellore cattle
Provedor de dados: 63
Autores: Cancian,Paulo Henrique; Gomes,Rodrigo da Costa; Manicardi,Fernando Ricardo; Ianni,Andrea Cristina; Bonin,Marina de Nadai; Leme,Paulo Roberto; Silva,Saulo da Luz e.
The growing use of visual scores (VS) and ultrasound (US) for carcass evaluation in breeding programs, calls for a knowledge of the relationships between these traits and other relevant characteristics, such as feed efficiency and production of commercial cuts. The objective of this study was to evaluate correlations between body visual scores and carcass traits identified by ultrasound (US) and feed efficiency (FE), carcass weight (HCW), dressing percentage (DP) and retail product yield (RPY) in beef cattle. Nellore cattle (male), 42 non-castrated [NCAST] and 44 castrated [CAST]) were evaluated by both VS and US, at the postweaning (15-month old) and finishing phases (21-month old). Visual scores of conformation (C), precocity (P) and muscling (M) were...
Tipo: Info:eu-repo/semantics/article
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162014000100002

Somatic embryogenesis in Citrus sinensis, C. reticulata AND C. nobilis x C. deliciosa
Provedor de dados: 63
Autores: Ricci,Adriana Patrícia; Mourão Filho,Francisco de Assis Alves; Mendes,Beatriz Madalena Januzzi; Piedade,Sonia Maria de Stefano.
Most of the plant regeneration processes in citrus, through tissue culture, involve indirect somatic embryogenesis. The optimization of these processes is important for the development of in vitro plant improvement and micropropagation studies. Studies to evaluate the effect of different carbohydrates in somatic embryogenesis were conducted using calli from 'Ponkan' mandarin (Citrus reticulata, Blanco), 'Cravo' mandarin (C. reticulata), 'Itaboraí' sweet orange (C. sinensis L. Osbeck.), 'Valencia' sweet orange (C. sinensis) and 'Kinnow' mandarin (C. nobilis Loureiro x C. deliciosa Tenore). The culture medium used was MT supplemented with sucrose, galactose, glucose, maltose or lactose with the following concentrations of 18, 37, 75, 110, and 150 mM. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Callus; Carbohydrate; Citrus; Somatic embryo.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000100005

Hot pepper (Capsicum chinense, Jacq.) inheritance of reaction to powdery mildew
Provedor de dados: 63
Autores: Blat,Sally Ferreira; Costa,Cyro Paulino da; Vencovsky,Roland; Sala,Fernando Cesar.
The pepper species C. chinense has been considered one of the most important resistance sources to powdery mildew Capsicum spp. However, the inheritance in this species was unknown. The purpose of this work was to study its reaction inheritance. Two powdery mildew resistant parents, 'Pimenta Cheiro' 1 and PI 152225 and two moderately susceptible ones, 'Pimenta Doce' IH-1761 and 'Pimenta Índio', were used to obtain three F1 and their respective F2 generations: 'Pimenta Doce' IH-1761 &lt;FONT FACE=Symbol&gt;´&lt;/FONT&gt; 'Pimenta Cheiro' 1, 'Pimenta Índio' &lt;FONT FACE=Symbol&gt;´&lt;/FONT&gt; PI 152225 and 'Pimenta Doce' IH-1761 &lt;FONT FACE=Symbol&gt;´&lt;/FONT&gt; PI 152225. The powdery mildew epidemy was natural using inoculum from a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Leveillula taurica (LEV.) Arn.; Capsicum chinense; Genetic resistance; Gene action.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000500008

Botanical source investigation and evaluation of the effect of seasonality on Brazilian propolis from Apis mellifera L.
Provedor de dados: 63
Autores: Tomazzoli,Maíra Maciel; Zeggio,Amélia Regina Somensi; Pai Neto,Remi Dal; Specht,Leandro; Costa,Christopher; Rocha,Miguel; Yunes,Rosendo Augusto; Maraschin,Marcelo.
ABSTRACT: Bees generally use different botanical sources of resins for the production of propolis. The elucidation of botanical sources of propolis and identification of the effects of seasonality on the chemical profile of propolis are recognized as two important aspects in the development of a high quality product. Thus, our objective was to elucidate the botanical source and identify the effect of the seasons on the chemical profile of propolis produced in southern Brazil. The chemical profile of the samples was analysed by spectrophotometric and chromatographic techniques and the results were coupled to multivariate analysis. Field observation of the foraging behaviour of Apis mellifera L. revealed its preference for the Baccharis dracunculifolia DC....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Baccharis dracunculifolia; Honeybees; Phenolics; Seasons.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000601301

Modelagem matemática como metodologia de análise do crescimento e arquitetura de sistemas radiculares
Provedor de dados: 63
Autores: Teruel,Dioger Alexandre; Dourado-Neto,Durval; Hopmans,Jan W.; Reichardt,Klaus.
Devido à dificuldade de observação, quantificação e interpretação de sistemas radiculares, o estado da arte do conhecimento científico nesta área está aquém do desejável. Estas dificuldades tornam a análise e a interpretação da arquitetura de sistemas radiculares praticamente impossíveis de serem realizadas pela estatística tradicional, fazendo com que a modelagem matemática seja uma abordagem atrativa. Utilizou-se neste estudo plantas de soja, visto que a maioria dos trabalhos de pesquisa sobre a estrutura e funcionamento de sistemas radiculares de culturas comerciais tem sido realizada com um pequeno número de espécies, com ênfase nas monocotiledôneas, sendo muito poucos aqueles com dicotiledôneas herbáceas e espécies arbóreas. Estudou-se a influência da...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycine max; Modelo matemático; Raiz; Nutriente; Fósforo.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000400014

Nitrogen and silicon fertilization of upland rice
Provedor de dados: 63
Autores: Mauad,Munir; Crusciol,Carlos Alexandre Costa; Grassi Filho,Hélio; Corrêa,Juliano Corulli.
Silicon is not considered an essential element for plant development and growth, but its absorption brings several benefits to some crops, especially rice, by increasing cellular wall thickness, providing mechanical resistance to the penetration of fungi, improving the opening angle of leaves and making them more erect, decreasing self-shading and increasing resistance to lodging, especially under high nitrogen rates. To evaluate the effects of nitrogen and silicon fertilization on vegetative and yield components, plant height, and yield of rice cultivar IAC 202, an experiment was carried out combining three nitrogen rates (5, 75 and 150 mg N kg-1 soil) applied as urea, and four silicon rates (0, 200, 400 and 600 mg SiO2 kg-1 soil) applied as calcium...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Oryza sativa L.; Silicon; Nitrogen; Yield components.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000400023

AMMI analysis of the adaptability and yield stability of yellow passion fruit varieties
Provedor de dados: 63
Autores: Oliveira,Eder Jorge de; Freitas,Juan Paulo Xavier de; Jesus,Onildo Nunes de.
High yield stability and adaptability of yellow passion fruit varieties (Passiflora edulis Sims. f. flavicarpa Deg.) are highly desirable attributes when exploring different environments. This study aimed to evaluate the adaptability and yield stability of yellow passion fruit varieties using AMMI (additive main effects and multiplicative interaction) and other ancillary statistics. Twelve varieties were evaluated in eight environments. Analysis of variance showed effects attributable to the varieties (G), environment (E) and their interaction (G × E). The first two multiplicative components of the interaction accounted for 69% of the sum of squares. The scores of the principal interaction components showed high variability for the environments relative to...
Tipo: Info:eu-repo/semantics/article
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162014000200008

Níveis críticos de fósforo para o estabelecimento de gramíneas forrageiras em Latossolo Vermelho-Amarelo, álico. I: ensaio em casa de vegetação
Provedor de dados: 63
Autores: Corrêa,L. de A.; Haag,H.P.
O estudo, desenvolvido em casa de vegetação, teve por objetivos determinar os níveis críticos de P no solo, avaliados pelos extratores de Mehlich I e Resina e na planta, para o estabelecimento das gramíneas Brachiaria decumbens Stapf., Brachiaria brizantha (Ilochst.) Stapf. cv. Marandu e Panicum maximum Jacq., em Latossolo Vermelho Amarelo, álico. O delineamento experimental foi o de blocos casualizados com quatro repetições, no esquema fatorial: 7 (doses de P) x 3 (gramíneas). As doses de P corresponderam a 0; 17,5; 35,0; 70,0; 140,0; 280,0 e 560,0 ppm. Foram realizados dois cortes, o primeiro 50 dias após a semeadura e o segundo com 30 dias de rebrota. Não foram constatadas diferenças entre as espécies quanto à exigência em P para o seu estabelecimento....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: P no solo; P na planta; Adubação fosfatada; Gramínea forrageira.
Ano: 1993
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161993000100014

Rates and methods of applying urea to common beans
Provedor de dados: 63
Autores: Kiehl,J.C.; Silveira,R.I.; Brito Neto,J.
The effect of rate and method of urea application on the yield of common beans (Phaseolus vulgaris L., cv. IPA-1) was evaluated on a Red-Yellow Latosol (Psamentic Haplortox) of Arapiraca and on a Solodic Planosol (Ustalf) of Igaci, both sandy-clay-loams located in the State of Alagoas, Brazil. Rates of 30,60 and 90 kg N/ha were applied placing the urea totally in the furrow at planting time; totally sidedressed twenty days after planting, mixed or not with the soil; or 1/3 of the amount in the furrow at planting plus 2/3 sidedressed twenty days after planting, mixed or not with the soil. Bean yield responses to nitrogen followed quadratic equations. In the Red-Yellow Latosol response to nitrogen occurred up to the rate of 66 kg N/ha, while in the Solodic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bean; Urea; Nitrogen; Method of application.
Ano: 1993
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161993000200013

Forage intake and botanical composition of feed for cattle fed Brachiaria/legume mixtures
Provedor de dados: 63
Autores: Macedo,Robert; Tarré,Ricardo Martinez; Ferreira,Elvino; Rezende,Claudia de Paula; Pereira,José Marques; Cadisch,Georg; Rouws,Janaina Ribeiro Costa; Alves,Bruno José Rodrigues; Urquiaga,Segundo; Boddey,Robert Michael.
A key contribution to study the cycling of nutrients in soil/plant/animal systems is the evaluation of the consumption of forage and their nutrients by cattle. The objective of this study was to test techniques to evaluate faecal production, in vitro digestibility, forage consumption and the proportion of legume in the acquired diet. Five Zebu steer calves were confined and fed five diets of different combinations of Brachiaria dictyoneura and Desmodium ovalifolium. All quantities of faeces were collected per animal and these values were found to compare favourably with those derived from using the chromium oxide technique. In vitro digestibility ranged from 7 to 10% higher than the actual in vivo digestibility. Faecal samples from steers fed with diets...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brachiaria dictyoneura; Desmodium ovalifolium; 13C abundance; Digestibility; Forage intake.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000400002

Association of CSSM066 and ILSTS011 microsatellite markers and thyroglobulin gene SNP with backfat in Canchim cattle
Provedor de dados: 63
Autores: Veneroni,Gisele Batista; Meirelles,Sarah Laguna; Oliveira,Henrique Nunes de; Alencar,Maurício Mello de; Gasparin,Gustavo; Gouveia,João José de Simoni; Cervini,Marcelo; Regitano,Luciana Correia de Almeida.
Canchim, a synthetic breed of cattle derived from the Charolais and Zebu group has been used in the beef-cattle industry in Brazil as an alternative for intensifying production. One of the main concerns with this breed is its poor fat deposition and consequently, there is an effort to increase the performance for this trait. The thyroglobulin gene is located in a QTL region for fat deposition, and reports describe the influence of a polymorphism in the 5´ leader sequence of that gene on marbling and subcutaneous fat thickness. This study analyzed the association of this polymorphism in the thyroglobulin gene, as well as of two flanking microsatellite markers, CSSM066 and ILSTS011, with backfat thickness in 987 Canchim beef cattle. The CSSM066 and ILSTS011...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Canchim breed; Fat deposition; Molecular markers; Candidate gene.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162012000100001

Condutividade elétrica da solução nutritiva e produção de alface em hidroponia
Provedor de dados: 63
Autores: Costa,Paulo César; Didone,Evanessa B.; Sesso,Thaís M.; Cañizares,Kathia Alexandra Lara; Goto,Rumy.
A variação da condutividade elétrica da solução nutritiva altera a absorção de água e nutrientes pelas plantas, interferindo no metabolismo e, consequentemente, na produção das mesmas. Este trabalho, conduzido no período de agosto a outubro de 1999, avaliou o efeito da condutividade elétrica (CE) sobre a produção e desenvolvimento de alface americana de cabeça crespa, cultivar Ryder em hidroponia. As tendências de variação da condutividade elétrica do meio nutritivo, durante o desenvolvimento da alface, foram também avaliadas. Foi utilizado o delineamento inteiramente casualizado com seis repetições e três tratamentos, constituídos pelas condutividade elétricas: CE1= 1,46, CE2= 2,46 e CE3= 4,21 (± 0,24) mS cm-1. O diâmetro e altura da cabeça e peso seco da...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lactuca sativa; Solução nutritiva; Produção; Cultivo sem solo.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000300023

Stalk yield and technological attributes of planted cane as related to nitrogen fertilization
Provedor de dados: 63
Autores: Franco,Henrique Coutinho Junqueira; Trivelin,Paulo Cesar Ocheuze; Carlos Eduardo,Faroni; Vitti,André Cesar; Otto,Rafael.
A still unclear question related to sugarcane cropping refers to the low response of the planted cane to nitrogen fertilization. Two experiments were carried out in areas under a Typic Hapludox, located in Pirassununga, São Paulo State, Brazil, and an Arenic Kandiudult, located in Jaboticabal, São Paulo State, Brazil, with the objective to evaluate planted cane response to nitrogen fertilization at planting. The experimental design was organized as random blocks and treatments consisted of three N rates (40, 80, and 120 kg ha-1 N-urea) and a control without N. Nitrogen fertilizers were applied to the bottom of the planting furrow and then incorporated into the soil. During the maximum growth stage, +1 leaf samples were collected from all experimental plots...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Saccharum spp.; Nitrogen; Urea.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000500012

EFEITO ANTAGÔNICO DE Trichoderma sp. NO DESENVOLVIMENTO DE Beauveria bassiana (Bals.) Vuill. e Metarhizium anisopliae (Metsch.) Sorok
Provedor de dados: 63
Autores: Moino Jr.,Alcides; Alves,Sérgio Batista.
Este trabalho teve por objetivo avaliar o efeito de Trichoderma sp. no desenvolvimento de Beauveria bassiana e Metarhizium anisopliae. Trichoderma sp., B. bassiana (isolado 634) e M. anisopliae (isolado E-9) foram inoculados em meio BDA, com intervalos de 0, 48, 120 e 168 horas entre a inoculação de Trichoderma sp. e dos entomopatógenos. Avaliou-se o crescimento radial das colônias nos períodos de 48 e 120 horas após a inoculação de Trichoderma sp., sendo que este afetou o desenvolvimento dos entomopatógenos quando inoculado simultaneamente ou após 48 horas. B. bassiana e M. anisopliae desenvolveram-se normalmente quando inoculados 168 horas antes de Trichoderma sp.. Também foi avaliado o efeito de um extrato de Trichoderma sp. sobre os entomopatógenos,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fungos entomopatogênicos; Efeito antagônico; Controle biológico.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000100029

Superação de dormência em sementes de Brachiaria brizantha cv. Marandu
Provedor de dados: 63
Autores: Garcia,J.; Cícero,S.M.
As tentativas de se efetuar a colheita de sementes de Brachiaria brizantha cv. Marandu por via mecanizada esbarraram em sua baixa germinação, o que é atribuído à dormência. Em vista disso, o presente trabalho buscou encontrar alternativas para superar tal fenômeno. Para tanto, utilizaram dois lotes de sementes colhidas no cacho, manualmente, um deles oriundo de Neves Paulista-SP e o outro, de Goiânia-GO. Amostras desses dois lotes foram submetidas aos seguintes tratamentos, (em delineamento experimental inteiramente casualizado, com quatro repetições): substrato de germinação umedecido com 13ml de H2O (testemunha); substrato umidecido com 13ml de KNO3 a 0,2%; sementes submetidas ao H2SO4 concentrado por 15 minutos, seguido de lavagem em água corrente por...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gramínea; Forrageira; Germinação; Capim; Dormência.
Ano: 1992
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161992000400003

Nitrogen fixation and growth response of Alnus Rubra following fertiliztion with urea or biosolids
Provedor de dados: 63
Autores: Gaulke,Linda S.; Henry,Charles L.; Brown,Sally L.
Nitrogen fertilization of forests using biosolids offers a potentially environmentally friendly means to accelerate tree growth. This field study was designed to analyze the effects of nitrogen fertilization on the symbiotic, nitrogen (N)-fixing relationship between Alnus rubra Bong. (red alder) and Frankia. Anaerobically digested, class B biosolids and synthetic urea (46% N) were applied at rates of 140, 280 and 560 kg ha-1 available N to a well-drained, sandy, glacial outwash soil in the Indianola series (mixed, mesic Dystric Xeropsamments). Plots were planted with A. rubra seedlings. At the end of each of two growing seasons trees were harvested and analyzed for the rate of N fixation (as acetylene reduction activity), biomass and foliar N. At year 1,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Frankia; Acetylene reduction activity (ARA).
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000400007

O PESSEGUEIRO NO SISTEMA DE POMAR COMPACTO: VIII. CARACTERIZAÇÃO DE CULTIVARES E SELEÇÕES  PARA DIFERENTES DENSIDADES POPULACIONAIS
Provedor de dados: 63
Autores: BARBOSA,W.; CAMPO DALL'ORTO,F.A.; OJIMA,M.; SANTOS,R.R. dos.
Caracterizou-se no período de 1991-94, na Estação Experimental de Monte Alegre do Sul (22o41'S; 46o43'W e 40 HF-7), IAC, o desenvolvimeento de treze pessegueiros e cinco nectarineiras, cultivados em três lotes contíguos, nos espaçamentos adensados de 4m x 0,5m; 4m x 1m; e 4m x 1,5m, correspondendo a 5000, 2500 e 1667 indivíduos por hectare respectivamente. As copas das plantas foram podadas drasticamente, a cada dois anos, após a colheita. Registrou-se o número de nós de gemas por metro de ramo e de gemas vegetativas e floríferas por nó e a porcentagem de pegamento, o ciclo de crescimento, a massa e a época de colheita dos frutos. Os maiores índices de desenvolvimento foram verificados em Talismã, Aurora-1, Aurora-2, Jóia-1, Tropical e Flordaprince,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pêssego; Nectarina; Prunus persica; Pomar compacto; Poda drástica; Fenologia; Germoplasma.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000200004

Genetic similarity among strawberry cultivars assessed by RAPD and ISSR markers
Provedor de dados: 63
Autores: Morales,Rafael Gustavo Ferreira; Resende,Juliano Tadeu Vilela; Faria,Marcos Ventura; Andrade,Marcela Carvalho; Resende,Luciane Vilela; Delatorre,Carla Andrea; Silva,Paulo Roberto da.
Most strawberry (Fragaria × ananassa Duchesne) cultivars used in Brazil are developed in other countries, it became clear the need to start the strawberry breeding program in the country. To start a breeding program is necessary the genetic characterization of the germplasm available. Molecular markers are important tools that can be used for this purpose. The objectives of the present study were to assess the genetic similarity among 11 strawberry cultivars using RAPD and ISSR molecular markers and to indicate the possible promising crosses. The DNA of the eleven strawberry cultivars was extracted and amplified by PCR with RAPD and ISSR primers. The DNA fragments were separated in agarose gel for the RAPD markers and in polyacrylamide gel for the ISSR...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fragaria× ananassa; Plant breeding; Genetic divergence; Molecular markers.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000600010

Características fisiológicas de porta-enxertos de videira em solução salina
Provedor de dados: 63
Autores: Viana,Alexandre Pio; Bruckner,Claudio Horst; Prieto Martinez,Herminia Emilia; Martinez y Huaman,Carlos Alberto; Mosquim,Paulo Roberto.
A tolerância de cinco porta-enxertos de videira ('IAC 766 Campinas', 'IAC 313 Tropical', 'IAC 572 Jales', '420-A' e 'Ripária do Traviú') à salinidade foi avaliada em um ensaio, em casa de vegetação, em solução nutritiva, com cinco níveis de NaCl (0, 5, 10, 15 e 20 mmol L-1). Foram determinados a taxa fotossintética, a condutância estomática, a taxa transpiratória, a altura de plantas e o peso da matéria seca. A altura de planta e o peso da matéria seca foram afetados pelo incremento da salinidade. As cultivares mais tolerantes ('IAC 572', 'IAC 766' e 'Ripária do Traviú') apresentaram, mesmo nas maiores doses de NaCl, fotossíntese líquida de 0,75 mimol m-2 s-1, acompanhada pela manutenção da abertura estomática e da taxa transpiratória.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Videira; Porta-enxerto; Salinidade; Tolerância; Crescimento.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000100021

Software to model soil water retention curves (SWRC, version 2.00)
Provedor de dados: 63
Autores: Dourado-Neto,Durval; Nielsen,Donald R.; Hopmans,Jan W.; Reichardt,Klaus; Bacchi,Osny Oliveira Santos.
A software for the adjustment of soil water retention curves (SWRC) is presented, using twelve models found in the literature.
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Soil matric potential; Soil water content; Retention.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000100031

Arbuscular mycorrhiza and kinetic parameters of phosphorus absorption by bean plants
Provedor de dados: 63
Autores: Silveira,Adriana Parada Dias da; Cardoso,Elke Jurandy Bran Nogueira.
The mechanisms that determine greater P absorption by mycorrhizal plants are still not completely clear, and are attributed, in part, to an increase in the number of absorption sites promoted by the hyphae, and/or to a greater affinity of the colonized hypha or root carriers to P. The effect of mycorrhizae formed by Glomus etunicatum on the kinetic parameters of P absorption by the roots and on P influx in bean plants of the IAC-Carioca cultivar was evaluated, in two distinct plant development periods: at the onset of flowering and at the pod-filling stage (35 and 50 days after sowing, respectively). A mixture of sand and silica (9:1) was utilized as substrate and irrigated with nutrient solution. The kinetics assay was performed by the method of 32P...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phaseolus vulgaris; Arbuscular mycorrhizal fungus; Absorption kinetics; Phosphorus influx; Bean.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000200013

Priorities in seed pathology research
Provedor de dados: 63
Autores: Nameth,S.T.
Seed pathology as a subdisipline of plant pathology is relatively new. Paul Neergard is considered the father of seed pathology. Recent developments in the area of seed pathology technology allow for more ecofriendly seed treatments and more reliable seed health testing. Due to economics and new interest in environmental issues, research into the viability of biological seed treatments is becoming more common. The use of sophisticated DNA amplification technologies allows for the detection of seedborne pathogens that might go undetected using more conventional means. These types of research will be fundamental in guaranteeing seed health quality standards and achieving phytosanitary requirements throughout the world in the new millennium.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Seedborne pathogens; Pathogen detection; Seed treatments; PCR; DNA amplification.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000500017

CONSIDERAÇÕES A RESPEITO DE FUNÇÕES ESTIMÁVEIS FORNECIDAS PELO PROC GLM DO SAS PARA DADOS DESBALANCEADOS
Provedor de dados: 63
Autores: Mondardo,M.; Iemma,A.F.
o procedimento GLM do sistema estatístico SAS apresenta quatro tipos de somas de quadrados para testar hipóteses sobre dados desbalanceados. Essas somas de quadrados são obtidas a partir de funções estimáveis construídas pelo SAS. Os mecanismos usados para a construção desses quatro tipos de funções estimáveis são aqui discutidas e ilustradas, passo a passo, em exemplos numéricos.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Modelo linear; Análise de variância; Dados desbalanceados; SAS.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000200002

Controle biológico do ácaro rajado com ácaros predadores fitoseídeos (Acari: Tetranychidae, Phytoseiidae) em culturas de pepino e morango
Provedor de dados: 63
Autores: Watanabe,M.A.; Moraes,G.J. de; Gastaldo Jr.,I.; Nicolella,G.
O ácaro rajado, Tetranychus urticae Koch, é considerado uma das principais pragas de hortaliças e várias outras culturas no Brasil, em áreas onde um considerável volume de acaricidas é anualmente empregado no seu controle. O objetivo deste trabalho foi testar a viabilidade técnica do emprego dos fitoseídeos Amblyseius idaeus (Denmark &amp;amp; Muma) e Phytoseudus macropilis (Banks), comum ente encontrados no Brasil, no controle de T. urticae em pepino e morangueiro em Jaguaríúna,SP. Utilizou-se o delineamento experimental em blocos casualizados, com 4 repetições e 4 tratamentos (T1-T4) para o pepino e 5 tratamentos para o morangueiro (T1-T5): T1, testemunha; T2, pulverizações semanais de Malation para a exclusão de predadores nativos; T3, liberações...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ácaro rajado; Tetranychus urticae; Phytoseiidae; Amblyseius idaeus; Phytoseudus macropilis; Pepino; Cucumis sativus; Morango; Fragaria vesca.
Ano: 1994
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000100012

Biogas production: litter from broilers receiving direct-fed microbials and an enzyme blend
Provedor de dados: 63
Autores: Praes,Maria Fernanda Ferreira Menegucci; Lucas Junior,Jorge de; Orrico,Ana Carolina Amorim; Orrico Junior,Marco Antonio Previdelli; Hermes,Rafael Gustavo; Sorbara,José Otávio Berti; Duarte,Karina Ferreira; Schwingel,Alice Watte; Sgavioli,Sarah; Domingues,Carla Heloisa de Faria; Sunada,Natália da Silva.
ABSTRACT The effect of additives used in the feed of broilers on anaerobic bio-digestion of poultry litter was evaluated. Four diets were used: NC: negative control; DFM: NC + 500 ppm direct-fed microbials (DFM) containing Bacillus subtilis and Bacillus licheniformis; ENZ: diet formulated with an enzyme blend (20 ppm phytase, 200 ppm protease and 200 ppm xylanase); DFM+E: ENZ + DFM. Substrates for the anaerobic bio-digestion were prepared with litter from each treatment, containing 4 % total solids (TS). These were used in 16 continuous bio-digesters with a 2 kg d−1 load, to determine the production and potential biogas production and composition during an 85-day period. Influent and effluent samples were collected for the amounts of TS and volatile solids...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Additives; Bio-digestion; Bio-digester; Methane; Livestock residues.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000500406

Animal-based agriculture, phosphorus management and water quality in Brazil: options for the future
Provedor de dados: 63
Autores: Shigaki,Francirose; Sharpley,Andrew; Prochnow,Luís Ignácio.
Eutrophication has become a major threat to water quality in the U.S., Europe, and Australasia. In most cases, freshwater eutrophication is accelerated by increased inputs of phosphorus (P), of which agricultural runoff is now a major contributor, due to intensification of crop and animal production systems since the early 1990s'. Once little information is available on the impacts of Brazilian agriculture in water quality, recent changes in crop and animal production systems in Brazil were evaluated in the context of probable implications of the fate of P in agriculture. Between 1993 and 2003, there was 33% increase in the number of housed animals (i.e., beef, dairy cows, swine, and poultry), most in the South Region (i.e., Paraná, Rio Grande do Sul, and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Diffuse pollution; Eutrophication; Poultry production; Swine production; Surface runoff.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000200013

FLIGHT RANGE OF AFRICANIZED HONEYBEES, Apis mellifera L. 1758 (Hymenoptera: Apidae) IN AN APPLE GROVE
Provedor de dados: 63
Autores: PARANHOS,B.A.J; WALDER,J.M.M; CHAUD NETO,J.
Africanized honeybees from five colonies were marked with P-32 and taken to an apple grove for a flight behavior study. The method used to determine the flight range was to put out an array of tagged trees in a cross pattern with the colonies arranged in the center point of a 0.8 ha test area. The tagged trees were located 10 meters apart in the 4 rows of 50 meters each, arranged according to the North, South, East, and West directions. Bees were collected while visiting the tagged tree flowers twice a day, during a ten-day period. The number of honeybees marked decreased in relation to the distance from the hives. Analysis of variance showed that a linear regression was highly significant to describe the process. Geographic directions did not affect the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Honeybees; Flight range; Radiophosphorus.
Ano: 1997
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161997000100012

Threats to the Cerrado remnants of the state of São Paulo, Brazil
Provedor de dados: 63
Autores: Durigan,Giselda; Siqueira,Marinez Ferreira de; Franco,Geraldo Antonio Daher Correa.
Patches of natural vegetation remaining in landscapes occupied by man are continuously under threat due to the edge effects and also to land use types around these remnants. The most frequent threats and land use types in the vicinity of 81 Cerrado (tropical savanna type) fragments in the State of São Paulo, Brazil, were analyzed in order to verify if the frequency of every type of disturbance to the natural ecosystem depends on the neighboring land use. The hypothesis of the study assumes that environmental threats are correlated with land use around protected areas. From the 81 areas, the most frequent human-induced land cover types around the Cerrado remnants were: pasture (recorded in 78% of the areas), sugarcane plantations (26%), roads (19%), annual...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Savanna; Conservation; Impact; Fragmentation; Land use.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000400006

Sesame phyllody associated with a 16SrI-B phytoplasma, a ‘Candidatus Phytoplasma asteris’-related strain, in Paraguay
Provedor de dados: 63
Autores: Ganem Junior,Evandro de Jesus; Segnana,Luis Gonzalez; Kitajima,Elliot Watanabe; Bedendo,Ivan Paulo.
ABSTRACT: Sesame (Sesamum indicum L.) plants exhibiting symptoms of phyllody disease were observed in commercial fields in Paraguay. The symptoms were indicative of infection by phytoplasmas. Thus, the present study investigated the association between affected plants and phytoplasma, which was later analyzed using molecular and phylogenetic methods. Total DNA was extracted from symptomatic and asymptomatic plants and used in nested PCR assays using primers R16SN910601/R16SN011119 and R16F2n/16R2. Amplified products of 1.2 Kb revealed the presence of phytoplasma in all diseased plants, and electron microscopy confirmed the presence of phytoplasmas within phloem vessels. Nucleotide sequences from sesame phytoplasma shared 99 % similarity with phytoplasmas...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sesamum indicum (L.); Mollicutes; Yellows; Phloem bacteria.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162019000100047

Obtention and characterization of coconut babassu derivatives
Provedor de dados: 63
Autores: Ferrari,Roseli Aparecida; Soler,Marcia Paisano.
Babassu (Orbignya sp.) is a palm with extraordinary socioeconomic and ecologic importance found in humid tropical areas in Brazil, especially in frequently burned and degraded landscapes. There are several uses for babassu oil; however, its potential for providing other industrial products remains unexploited, due to the lack of scale and production structure. Oil and presscake extracted from kernels are industrially produced, while the remaining parts of the babassu coconut have the potential to add value as byproducts. This study aimed to establish conditions for the preparation of the raw material fruit of babassu for oil extraction by pressing and producing biodiesel by ethanolic transesterification. Babassu coconuts were dried at 75 and 90 °C. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biofuel; Quality; Integral use.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162015000400291

Theoretical basis and significance of the variance of discharge as a bidimensional variable for the design of lateral lines of micro-irrigation
Provedor de dados: 63
Autores: Detomini,Euro Roberto; Power,Brendan; Frizzone,José Antônio.
In order to support the theoretical basis and contribute to the improvement of educational capability issues relating to irrigation systems design, this point of view presents an alternative deduction of the variance of the discharge as a bidimensional and independent random variable. Then a subsequent brief application of an existing model is applied for statistical design of laterals in micro-irrigation. The better manufacturing precision of emitters allows lengthening a lateral for a given soil slope, although this does not necessarily mean that the statistical uniformity throughout the lateral will be more homogenous.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Error theory; Statistical approach; Manufacturing variation.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000400021

Vitamin A in diets for Nile tilapia
Provedor de dados: 63
Autores: Campeche,Daniela Ferraz Bacconi; Catharino,Rodrigo Ramos; Godoy,Helena Teixeira; Cyrino,José Eurico Possebon.
Dietary vitamin supplementation decrease stress caused by high stocking density, and boosts immunological system of farmed fish. A studied was carried out to determine vitamin A requirements of Nile tilapia (Oreochromis niloticus) in an all male group (13.8 ± 1.2 g) and a mixed sex population (9.8 ± 2.3 g). Fish stocked in 100-L plastic aquaria (26.0 ± 1.0ºC) were fed to near satiety, twice a day, seven days a week, during 75 days with vitamin A-free, semi-purified diets supplemented with 0; 600; 1,200; 1,800; 2,400; 3,000; 3,600; 4,200; 4,800 and 5,400 International Units (IU) of retinyl palmitate (30% vitamin A) per kg of diet in a completely randomized experimental design, factorial arrangement 2c10 (n = 4). Deficiency signs of vitamin A were observed...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Oreochromis niloticus; Retinol; Nutrition.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000600005

Errata
Provedor de dados: 63
Tipo: Info:eu-repo/semantics/article
Ano: 1994
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000100029

Somaclonal variation in micropropagated Heliconia bihai cv. Lobster Claw I plantlets (Heliconiaceae)
Provedor de dados: 63
Autores: Rodrigues,Paulo Hercílio Viegas.
The occurrence of somaclonal variation is described in various cultures of agronomic interest. Such variation can be of benefit in the development of new flower varieties. In this study, the occurrence of somaclonal variation in micropropagated changes of Heliconia bihai cv. Lobster Claw I was investigated. Stem apexes were introduced in MS culture media with the addition of 2.5 mg L-1 of benzylaminopure (BAP) and 500 mg L-1 of sodium cefotaxime. After selecting the apex stem, it was sub-cultivated in MS media and supplemented with 4.0 mg L-1 of BAP to induce side buds. To conduct the trial, 2,000 plants were selected and compared with plants originated from rhizomes. To calculate the percentage of the variants, the plant stature, the form and color of...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Tissue culture; Flower growing; Variability.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000600017

Seleção in vitro de gemas de bananeira 'Nanicão' tolerantes à salinidade
Provedor de dados: 63
Autores: Ulisses,Cláudia; Camara,Terezinha Rangel; Willadino,Lilia; Meunier,Isabelle; Rocha,Paulo Sérgio Gomes da; Albuquerque,Cynthia.
O objetivo deste trabalho foi avaliar o efeito do cloreto do sódio (NaCl) sobre o cultivo in vitro de gemas de bananeira cv. Nanicão (AAA) e selecionar as que se mostrassem tolerantes ao estresse imposto. As gemas foram cultivadas em meio nutritivo de Murashige e Skoog (MS) com 2,5 mg L-1 de BAP e suplementado com diferentes níveis de NaCl (0, 20, 40, 60, 80, 100 e 120 mM) durante 60 dias (Fase I). As gemas sobreviventes foram transferidas para o mesmo meio nutritivo MS, sem NaCl, e cultivadas durante 30 dias (Fase II). Em seguida, as gemas foram submetidas, durante 90 dias, aos tratamentos com 80 e 100 mM NaCl (Fase III). Foram selecionadas 100 gemas nessa última fase as quais, logo em seguida, foram colocadas em meio nutritivo sem NaCl, suplementado com...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Musa sp.; Variação somaclonal; Salinidade.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000400011

PREVISÃO DA EMERGÊNCIA DE Trissolcus brochymenae (ASHMEAD) E Telenomus podisi ASHMEAD (HYMENOPTERA: SCELIONIDAE) EM  CONDIÇÕES DE CAMPO
Provedor de dados: 63
Autores: CIVIDANES,F.J.; FIGUEIREDO,J.G.; CARVALHO,D.R.
Procurou-se averiguar em condições de campo, a previsão da emergência de Trissolcus brochymenae (Ashmead) e Telenomus podisi Ashmead, parasitóides de ovos de Piezodorus guildinii (West.), usando um método baseado em graus-dia. A emergência total de adultos ocorreu depois que foram acumulados 211,2 graus-dia para T. brochymenae e 229 graus-dia para T. podisi . A precisão da previsão da emergência de mais de 50% de T. brochymenae foi melhor que a de T. podisi, e para ambas as espécies esta emergência ocorreu a 2-3 dias da data prevista.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Previsão; Graus-dia; Parasitóides; Piezodorus guildinii; Glycine max.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000100008

Influência de fitorreguladores e nitrato de potássio na germinação de sementes e no crescimento de porta-enxerto de Citrus amblycarpa
Provedor de dados: 63
Autores: Leonel,S.; Modesto,J.C.; Rodrigues,J.D.
Foram avaliados os efeitos de fitorreguladores (giberelinas e citocininas) e nitrato de potássio (KNO3), na germinação de sementes e na promoção do crescimento de "seedlings" do porta-enxerto 'Nasnaran' (Citrus amblycarpa Ochese). Realizou-se primeiramente o experimento em germinador, contendo papel de filtro umedecido com água destilada e gerbox, como meio para a germinação das sementes. Os tratamentos foram realizados mediante imersão das sementes, em soluções preparadas com os fítorreguladores e KNO3, durante 24 horas. Através dos resultados obtidos, concluiu-se que o tratamento com 100 mg/1 de GA4 + GA7 + fenilmetilaminopurina, apresentou a maior porcentagem de germinação (88%), num tempo médio de 21 dias. Tomando como base o resultado do germinador,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sementes; Giberelinas; Citocininas; Nitrato de potássio; Germinação; Crescimento.
Ano: 1994
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000200009

Caracterização de fertilizantes simples contendo zinco
Provedor de dados: 63
Autores: Alcarde,J.C.; Rodella,A.A.
Materiais contendo zinco podem ser erroneamente considerados fertilizantes simples, devido ao inadequado procedimento oficialmente adotado para avaliar o teor de zinco nos fertilizantes. O objetivo do presente trabalho foi estabelecer um procedimento analítico, viável de utilização em rotina, que permita reconhecer se um material contendo zinco pode ser considerado fertilizante simples. O estudo baseou-se no uso das soluções extratoras: cloreto de amônio 2M, 1,5M e 1M, citrato de amônio de densidade 1,09 e pH = 7,0, isto é, a mesma solução usada na avaliação do fósforo, na concentração original e nas diluições (1 + 1), (1 + 3) e (1 + 9) e solução de ácido cítrico a 2%. As técnicas de extração foram agitação ou fervura da amostra com as soluções extratoras....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fertilizantes simples; Zinco.
Ano: 1993
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161993000100017

Calcário e potássio para a cultura de soja
Provedor de dados: 63
Autores: Mascarenhas,Hipólito Assunção Antonio; Tanaka,Roberto Tetsuo; Carmello,Quirino Augusto de Camargo; Gallo,Paulo Boller; Ambrosano,Gláucia Maria Bovi.
Durante três anos agrícolas foi conduzido um experimento em Latossolo Vermelho-Escuro álico, textura argilosa em Mococa, SP, para estudar o efeito da aplicação de doses de calcário dolomítico (0, 3,5 e 7 t ha-1) e de potássio (0, 150, 300, 450 e 600 kg ha-1 de K2O na forma de KCl) sobre a produtividade da soja. Os dois insumos foram aplicados a lanço e incorporados ao solo. Foram utilizados os cultivares IAC-17 e FT-2, ambos com 110 dias de ciclo, cujas sementes foram inoculadas com Bradyrhizobium fixador do N atmosférico. Na análise conjunta, verificou-se que a máxima eficiência técnica seria obtida com 383 e 441 kg ha-1 de K2O, em associação, respectivamente, com 3,5 e 7 t ha-1 de calcário, e também quando as relações de (Ca + Mg)/K foram, em média, de...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycine max; Produção; Cultivar; Relação de cátions.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000300012

Effects of transportation stress on quality and sensory profiles of Nile tilapia fillets
Provedor de dados: 63
Autores: Goes,Elenice Souza dos Reis; Lara,Jorge Antônio Ferreira de; Gasparino,Eliane; Goes,Marcio Douglas; Zuanazzi,Jovana Silva Garbelini; Lopera-Barrero,Nelson Maurício; Rodriguez,Maria del Pilar Rodriguez; Castro,Pedro Luiz de; Ribeiro,Ricardo Pereira.
ABSTRACT: This study evaluated pre-slaughter stress and its influence on the stress indicators, quality characteristics and sensory characteristics of Nile tilapia fillets. To this end, two experiments were conducted: (1) two transportation times (60 and 240 min), with a density of 200 kg m−3, were compared to control treatment fish (in which the fish were removed from the net cage and immediately euthanized); and (2) two transportation densities (100 and 400 kg m−3), transported for 180 min, compared with control treatment fish. In experiment 1, the transportation time of 60 min resulted in higher levels of serum cortisol and plasma glucose compared to the transportation time of 240 min and the control. Fish fillets transported for 240 min had higher...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Oreochromis niloticus; PH; Colorimetry; Water holding capacity; Sensory analysis.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162018000400321

Comparison of neutron moisture gauges with nonnuclear methods to measure field soil water status
Provedor de dados: 63
Autores: Kirda,C.; Reichardt,K.
The neutron moisture gauge is compared with the gravimetric-core soil sampling technique, tensiometers and resistance blocks in relation to stability, Held variability, spatial dependence and number of samples needed at a given level of significance. The variance of field water content measurements with neutron moisture gauges is lower than that of the gravimetric sampling, which therefore requires 2 to 6 times as many samples as the number of measuring sites of the gauges to attain the same level of significance. The space dependence of the measurements made with the subsurface gauge varied depending on the average field soil water content. No space dependence was evident when the water content was lower than 0.2 cm³.cm-3 (50% saturation). Measurements...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Neutron gauges; Tensiometers; Resistance blocks; Spatial variability; Soil water.
Ano: 1992
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161992000400015

BESOUROS COPRÓFAGOS (COLEOPTERA; SCARABAEIDAE) COLETADOS EM PIRACICABA, SP
Provedor de dados: 63
Autores: RODRIGUES,S.R.; MARCHINI,L.C.
Através do uso de armadilhas "pitfall" iscadas com massa fecal fresca de bovinos, realizou-se a coleta de besouros coprófagos (Coleoptera; Scarabaeidae), durante o período de 15 de abril de 1995 a 17 de fevereiro de 1996, em área de pastagem ao lado de confinamento de bovinos, em Piracicaba, SP. Coletou-se um total de 11 espécies distribuidas nos gêneros Aphodius, Ataenius, Trichillum, Eurysternus, Dichotomius e Canthon. Os besouros coprófagos de comportamento endocoprídeo representaram 72,73% das espécies coletadas, sendo estes os de maior ocorrência e a espécie Aphodius lividus parece ser a mais bem adaptada na área estudada.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Scarabaeidae; Besouros coprófagos; Lista de espécies; Fezes bovinas.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000100010

Distribution-free multiple imputation in an interaction matrix through singular value decomposition
Provedor de dados: 63
Autores: Bergamo,Genevile Carife; Dias,Carlos Tadeu dos Santos; Krzanowski,Wojtek Janusz.
Some techniques of multivariate statistical analysis can only be conducted on a complete data matrix, but the process of data collection often misses some elements. Imputation is a technique by which the missing elements are replaced by plausible values, so that a valid analysis can be performed on the completed data set. A multiple imputation method is proposed based on a modification to the singular value decomposition (SVD) method for single imputation, developed by Krzanowski. The method was evaluated on a genotype × environment (G × E) interaction matrix obtained from a randomized blocks experiment on Eucalyptus grandis grown in multienvironments. Values of E. grandis heights in the G × E complete interaction matrix were deleted randomly at three...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Missing data; Nonparametric; Eigenvalue; Eigenvector; Genotype-environment.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000400015

Avaliação de genótipos de trigo oriundos de cruzamento interespecífico e radiação gama no estado de São Paulo
Provedor de dados: 63
Autores: Camargo,C.E.O.; Tulmann Neto,A.; Ferreira Filho,A.W.P.; Freitas,J.G.; Pettinelli Junior,A.; Castro,J.L.
Foram comparadas entre si e com dois controles vinte e três linhagens hexaplóides originárias de seleções realizadas em população submetida à radiação gama (27,5 krad), em geração F4, do cruzamento interespecífico entre BH-1146 (Triticum aestivum L.) e Anhinga "S" x Winged "S" (T. durum L.). Em nove ensaios em condições de irrigação e de sequeiro, analisou-se uma série de características agronômicas. Em laboratório efetuaram-se estudos da tolerância ao alumínio. As linhagens 11 e 19 de porte médio, com moderada resistência ao acamamento, tolerantes à toxicidade de alumínio destacaram-se quanto à produção de grãos. Sete linhagens apresentaram moderada resistência ao agente causai do oídio. Todos os genótipos foram suscetíveis aos agentes causais das manchas...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Trigo; Trigo duro; Híbrido interespecífico; Genótipos; Radiação gama; Características agronômicas.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000100006

Nitrogen doses and water balance components at phenological stages of corn
Provedor de dados: 63
Autores: Silva,Monica Martins da; Libardi,Paulo Leonel; Fernandes,Flávia Carvalho Silva.
Determining the intensity of the water balance components in the control volume of a soil, and consequently defining the most likely periods of occurrence of a water deficit in a crop, is an exercise that requires knowledge about soil, climate and plant factors. This research aimed to evaluate soil water balance components at phenological stages of corn (Zea mays L.) under no-till system, when fertilized with 60, 120, and 180 kg ha-1 of nitrogen. The field experiment was carried out in Piracicaba, State of São Paulo, Brazil, on a Typic Hapludox. Evaluations were made in the 2004/2005 and 2005/2006 corn cropping seasons, divided over three stages according to the plant's phenology. Runoff was not taken into account. Measurements were made for precipitation...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Internal drainage; Hydraulic conductivity; Actual evapotranspiration; Tensiometer; No-till system.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000400013

Efeito das condições de atmosfera controlada sobre a ocorrência de degenerescência em maçã 'Fuji'
Provedor de dados: 63
Autores: Brackmann,A.; Saquet,A.A.
O trabalho foi conduzido durante o ano de 1993, com objetivo avaliar o efeito das temperaturas e concentrações de oxigênio nas câmaras de atmosfera controlada (AC), sobre a manifestação da degenerescência e conservação da qualidade dos frutos da maçã 'Fuji', durante o armazenamento. Os frutos utilizados já haviam sido armazenados em câmaras de atmosfera normal (AN) durante 72 dias, quando então já apresentavam 17% de degenerescência interna. Foram então armazenados em duas temperaturas (1 °C e 2 °C), UR de 97% e diferentes condições de AC: AC&gt;0%CO2/ 1%O2, 0%CO2/1,5%O2 e 0%C2/2%O2. Após 6 meses de armazenamento, a temperatura de 1 °C e concentrações de oxigênio mais baixas (0%CO2/1%O2 e 0%CO2/1,5%O2) proporcionaram os menores percentuais de...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Maçã 'Fuji'; Atmosfera controlada; Degenerescência.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000200010

Genetic characterization of Xylella fastidiosa isolated from citrus and coffee plants
Provedor de dados: 63
Autores: Miranda,Vicente Savonitti; Farias,Paulo Roberto Silva; Roberto,Sérgio Rufo; Lacava,Pedro Magalhães.
The Citrus Variegated Chlorosis and the Coffee Leaf Scorch are some of the many destructive diseases caused by Xylella fastidiosa, a gram-negative bacterium limited to the xylem of affected plants. As its genetic characterization is still not well established, different isolates of X. fastidiosa from citrus and coffee were evaluated through RAPD (Random Amplified Polymorphic DNA) technique to characterize and classify these isolates based on similarity coefficients. Sixteen isolates of X. fastidiosa were used on this trial, obtained from citrus, coffee and almond. The genetic polymorphism evaluation was performed using six arbitrary 10-base primer pairs. It was possible to establish a dendogram in which the isolates were classified into five groups (A, B,...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: RAPD; Gram-negative bacterium; Genetic divergence.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000500005

Soil organisms in organic and conventional cropping systems
Provedor de dados: 63
Autores: Bettiol,Wagner; Ghini,Raquel; Galvão,José Abrahão Haddad; Ligo,Marcos Antônio Vieira; Mineiro,Jeferson Luiz de Carvalho.
Despite the recent interest in organic agriculture, little research has been carried out in this area. Thus, the objective of this study was to compare, in a dystrophic Ultisol, the effects of organic and conventional agricultures on soil organism populations, for the tomato (Lycopersicum esculentum) and corn (Zea mays) crops. In general, it was found that fungus, bacterium and actinomycet populations counted by the number of colonies in the media, were similar for the two cropping systems. CO2 evolution during the cropping season was higher, up to the double for the organic agriculture system as compared to the conventional. The number of earthworms was about ten times higher in the organic system. There was no difference in the decomposition rate of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil microorganisms; Organic agriculture; Microartropods; Cropping systems; Environmental impacts.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000300023

Controle da vitrificação do cravo (Dianthus caryophyllus L.) in vitro
Provedor de dados: 63
Autores: Cuzzuol,G.R.F.; Gallo,L.A.; Almeida,M. de; Crocomo,O.J.
Baixos níveis de benziladenina (BAP), baixo potencial de água no meio e baixa umidade condicionada por tampas de algodão foram capazes de inibir a vitrificação de cravo (Dianthus caryophyllus L.) cultivado In vitro, mas essas condições implicaram no baixo desenvolvimento das plantas e da taxa de propagação. Elevados níveis de NH4NO3 demonstraram serem altamente promotores da vitrifícação assinalada pelo alto conteúdo de proteína, enquanto relação inversa foi constatada para altos níveis de CaCl2, aos quais seguiu-se aumento na atividade da peroxidase. Os resultados permitiram estabelecer um protocolo para controle da vitrificação do cravo, constituído de 4,0 g/1 de "Gelrite", 0,5 mg/1 de ácido naftalenoacético (ANA), 0,05 mg/1 de BAP, doses normais das...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cravo Dianthus caryophyllus vitrifícação meristema; Micropropagação.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000300030

Competition in a rice - cowpea intercrop as affected by nitrogen fertilizer and plant population
Provedor de dados: 63
Autores: Oroka,Frank Oke; Omoregie,Anthony U.
The increased productivity or yield advantage provided by intercropping is attributed to a better use of resources by crops grown in mixtures, as compared to the same species grown in sole stands. In an intercropping system with upland rice and cowpea, the intra and inter-competition was quantified, as affected by plant population density and rate of nitrogen. Reductions in number of panicles per rice plant and number of grains per panicle were obtained with high density in both sole and mixture rice populations. Increasing nitrogen rate did not affect yield and yield components in both populations, but number and weight of pods per plant of cowpea in sole stands increased. Land equivalent ratios exceeding unity were obtained, indicating an improved...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aggressivity index; Land equivalent ratio; Nitrogen utilization efficiency; Relative crowding coefficient.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000600010

Oxisol subsurface chemical attributes related to sugarcane productivity
Provedor de dados: 63
Autores: Landell,Marcos Guimarães de Andrade; Prado,Hélio do; Vasconcelos,Antônio Carlos Machado de; Perecin,Dilermando; Rossetto,Raffaella; Bidoia,Márcio Aurélio Pitta; Silva,Marcelo de Almeida; Xavier,Mauro Alexandre.
In spite of the great homogeneity found in the morphological characteristics of Oxisols, there is great chemical diversity in subsurface layers of these soils. Studies indicate that crop yield presents significant correlation with the chemical attributes of the subsurface, which, are more stable than attributes found in the plough layer, subject to greater alterations as a consequence of agricultural exploration. This work evaluated the effects of subsurface chemical attributes of Oxisols of the South Central region of Brazil, on the yield of sugarcane clones and of variety RB72454, during the first, second and third cropping cycles. Productivity data were obtained between 1993 and 1998. Soils were characterized in terms of their mechanical analysis and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Yield; Soils; Linear models; Chemical analysis.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000400020

Grapevine root distribution in drip and microsprinkler irrigation
Provedor de dados: 63
Autores: Bassoi,Luis Henrique; Hopmans,Jan W.; Jorge,Lúcio André de Castro; Alencar,Cristina Miranda de; Silva,José Antonio Moura e.
Grape (Vitis vinifera L.) yield and its quality are dependent of the status of the root system. Root distribution information is also valuable for soil and water management. An analysis of methods to evaluate the root distribution of grapevines for both, drip and microsprinkler irrigation in a Typic Acrustox is presented for the table grape cv. Italia grafted on the rootstock IAC-313, in northeastern Brazil. Measured root parameters using the monolith method were root dry weight (Dw) and root length density (Lv), while root area (Ap) was estimated using the soil profile method in combination with digital image analysis. For both irrigation systems, roots were present to the 1 m soil depth and extended laterally to 1 m distance from the trunk, but...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vitis vinifera L.; Root system; Digital image.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000200024

Multiphase feeding program for broilers can replace traditional system
Provedor de dados: 63
Autores: Hauschild,Luciano; Bueno,Camila Ferreira Delfim; Remus,Aline; Gobi,Jaqueline de Paula; Isola,Renan Di Giovanni; Sakomura,Nilva Kazue.
Broilers are traditionally managed with feeding programs that often consist of three or four phases. In this study we investigated whether a multiphase feeding program (14 phases) of broilers based on the optimal mix of two feeds could replace a traditional four phase system while maintaining broiler performance. To evaluate this prposed program we measured variables of performance, carcass yield, and nitrogen excretion. In addition, we determined if the multiphase feeding program (14 phases) would be equally effective regardless of bird gender. A total of 480 day-old Cobb chicks were used, with an average weight of 44.74 ± 0.16 g (females) and 44.71 ± 0.11 g (males). The birds were distributed in a completely randomized 2 × 2 factorial design. Each...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Avinesp 1.0; Precision nutrition; Body composition; Levels of lysine.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162015000300210

Cabernet Sauvignon grapevine grafted onto rootstocks during the autumn-winter season in southeastern Brazilian
Provedor de dados: 63
Autores: Souza,Claudia Rita de; Mota,Renata Vieira da; França,Daniela Vieira Cardozo; Pimentel,Rodrigo Meirelles de Azevedo; Regina,Murillo de Albuquerque.
The change of grape (Vitis vinifera) harvest from summer to winter through double pruning management has improved the fine wine quality in southern Brazil. High altitude, late cultivar and grafting combination all need to be investigated to optimize this new viticulture management. For this purpose, this study was carried out during the 2011 and 2012 growing seasons in a high altitude region of the state of Minas Gerais, Brazil, using eight grafting combinations for five year old Cabernet Sauvignon vines. The stem water potential, photosynthetic rate and stomatal conductance were not affected by rootstock type. The rootstocks IAC 766 and 101-14 induced, respectively, the highest and lowest vegetative vigor in Cabernet Sauvignon, as shown by leaf area and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Double pruning; Leaf carbohydrates; Vegetative vigor; Grape composition.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162015000200138

Dietary canitine maintains energy reserves and delays fatigue of exercised african catfish (Clarias gariepinus) fed high fat diets
Provedor de dados: 63
Autores: Ozório,Rodrigo; Van Ginneken,Vincent; van den Thillart,Guido; Verstegen,Martin; Verreth,Johan.
Lipids, together with proteins, are traditionally considered as primary fuels during aerobic swimming. The effects of dietary fat and carnitine supplements and exercise on the energy metabolism of juvenile fish were investigated. One hundred African catfish (Clarias gariepinus) were fed four isonitrogenous diets containing a fat level of 100 or 190 g kg-1 diet and one of the two levels of carnitine (15 and 1000 mg kg-1). Fish grew from 61 to 162 g in 10 wk. Thereafter, 6 fish per group swam vigorously for 3 h and the results were compared with unexercised groups. Fish receiving 1,000 mg carnitine accumulated 2- to 3-fold more carnitine than fish receiving 15 mg carnitine. Plasma acyl-carnitine level was affected by an interaction between dietary treatment...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lipid metabolism; Catfish; Stress; Intensive aquaculture; Exhaustive swimming.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000300002

Ganhos em características morfológicas por seleção em populações de trigo
Provedor de dados: 63
Autores: Cavassim,José Elzevir; Borém,Aluízio.
Foram estimados os ganhos por seleção para três características agronômicas em trigo (Triticum aestivum L.): altura de plantas, número de grãos por espiga e comprimento de espigas. Os estudos foram realizados em Viçosa, MG, em cruzamentos entre as seguintes variedades: BH 1146 e BR 24, de porte alto, BR 12 e EMBRAPA 22, de porte baixo, constituindo um dialelo balanceado, sem as autofecundações, totalizando seis populações distintas. As avaliações foram feitas nas gerações F3 e F4. Na geração F3, foi realizada a seleção de plantas individuais, baseando-se na altura de plantas. Coletaram-se as vinte plantas mais baixas e as vinte mais altas em cada população, as quais foram submetidas ao teste de progênies na geração F4, onde foi efetuada a predição dos...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Triticum aestivum; Trigo; Ganho por seleção; Altura de plantas.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000400015

Infestação de girassol pela lagarta Chlosyne lacinia saundersii em duas épocas de cultivo
Provedor de dados: 63
Autores: Boiça Júnior,A.L.; Vendramim,J.D.
Verificou-se o comportamento de cultivares de girassol em relação ao ataque de Chlosyne lacinia saundersii em condições de campo, avaliando-se o número de lagartas por planta, numero de lagartas por metro linear de plantas, porcentagem de plantas atacadas e porcentagem de desfolha. Concluiu-se que: a) os métodos mais adequados para a avaliação da infestação desse inseto foram a porcentagem de plantas atacadas e o número de lagartas por metro linear de plantas; b) as cultivares de girassol menos infestadas pela praga foram 'Cargill-33', 'Contissol', 'Issanka-P, 'PIGB', 'Uruguai' e 'Contissol-621', enquanto 'Contissol-711% 'Contissol-112' e 'Rumano-P4' foram as mais infestadas e, c) a ocorrência de C. lacinia saundersii foi maior na segunda época de cultivo...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Resistência de plantas a insetos; Chlosyne lacinia saundersi; Helianthus annuus; Girassol.
Ano: 1993
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161993000200012

Nitrogen dynamics in a soil-sugar cane system
Provedor de dados: 63
Autores: Oliveira,Júlio César Martins de; Reichardt,Klaus; Bacchi,Osny O.S.; Timm,Luis Carlos; Dourado-Neto,Durval; Trivelin,Paulo César Ocheuse; Tominaga,Tânia Toyomi; Navarro,Roberta de Castro; Piccolo,Marisa de Cássia; Cássaro,Fábio Augusto Meira.
Results of an organic matter management experiment of a sugar cane crop are reported for the first cropping year. Sugar cane was planted in October 1997, and labeled with a 15N fertilizer pulse to study the fate of organic matter in the soil-plant system. A nitrogen balance is presented, partitioning the system in plant components (stalk, tip and straw), soil components (five soil organic matter fractions) and evaluating leaching losses. The 15N label permitted to determine, at the end of the growing season, amounts of nitrogen derived from the fertilizer, present in the above mentioned compartments.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fertilizer; Nitrogen; N label; Soil; Sugar cane.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000300015

Tenuipalpus oliveirai, a new species (Acari, Prostigmata, Tenuipalpidae) from Brazil
Provedor de dados: 63
Autores: Flechtmann,C.H.W.
Tenuipalpus oliveirai, a new species of tenuipalpid mite from Brazil is described and illustrated.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Tenuipalpus; False spider mite; Peschiera.
Ano: 1994
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000100026

Eficiência de extratores de fósforo para um solo adubado com fosfatos e cultivado com arroz
Provedor de dados: 63
Autores: Holanda,J.S.DE; Brasil,E.C; Salviano,A.A.C.; Carvalho,M.C.S.; Rodrigues,M.R.L.; Malavolta,E.
Visando comparar a eficiência de extratores químicos e isotópico na avaliação da disponibilidade de fósforo no solo, foi conduzido um experimento em casa de vegetação com Latossolo Vermelho-Amarelo. Foram realizados dois cultivos anteriores, com aplicação de fosfatos somente no primeiro. Os fosfatos usados foram: superfosfato simples, termofosfato Yoorin, Fosmag, fosfatos de Araxá e de Gafsa, nas doses de 50 e 150 mg.kg-1 terra. Neste experimento, terceiro cultivo, foram avaliados os extratores: Mehlich 1, Bray-1, resina e valor "E". As maiores correlações entre P-extraível do solo com produção de matéria seca e absorção de P pelo arroz foram apresentadas pelos extratores Bray-1 (r = 0,92) e resina (r = 0,91). O fósforo determinado pelo extrator Mehlich-1...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: P-solo; P-absorvido; Extratores de fósforo; Fosfatos solúveis; Fosfatos naturais; Arroz; Oryza sativa.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000300025

Degradação da palhada de cana-de-açúcar
Provedor de dados: 63
Autores: Oliveira,Mauro Wagner de; Trivelin,Paulo Cesar Ocheuze; Gava,Glauber José de Castro; Penatti,Claudemir Pedro.
Avaliou-se a influência da aplicação de uréia e vinhaça na degradação da lignocelulose e na liberação dos nutrientes da palhada de cana-de-açúcar. Os tratamentos foram: vinhaça (dose equivalente a 100 m3 ha-1) aplicada sobre a palhada, combinada com uréia (dose equivalente a 100 kg ha-1) aplicada sobre a palhada ou enterrada no solo; mistura de cloreto de potássio (dose equivalente a 120 kg ha-1 de K2O) com uréia (dose equivalente a 100 kg ha-1) aplicada sobre a palhada ou enterrada no solo. Durante o período experimental, janeiro a novembro de 1997, a palhada recebeu uma lâmina de água de 1.839 mm, sendo 923 mm de precipitações e 916 mm de irrigações. As médias das temperaturas máximas e mínimas foram 28,4 e 15,5°C, respectivamente. Não houve efeito dos...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Celulose; Lignina; Hemicelulose; Conteúdo celular; Nutrientes; Cana-de-açúcar.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000400006

NOTA DO EDITOR
Provedor de dados: 63
Autores: REICHARDT,KLAUS.
Tipo: Info:eu-repo/semantics/other
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000100001

Nitrogen fixation and growth response of Alnus rubra amended with low and high metal content biosolids
Provedor de dados: 63
Autores: Gaulke,Linda S.; Henry,Charles L.; Brown,Sally L.
Forest application of biosolids offers a potential environmentally friendly alternative to landfilling. This two-year investigation was designed to analyze the effects of elevated soil metal concentration resulting from the land application of biosolids on the symbiotic, nitrogen (N) fixing relationship between Alnus rubra Bong. (red alder) and Frankia. High metal biosolids and a modern-day composted biosolid applied at high loading rates of 250, 500, and 1000 Mg ha-1, were used to represent a worst-case scenario for metal contamination. The high metal biosolids were obtained before the current regulations were formulated and had been lagooned prior to use in this study. Total cadmium (Cd), lead (Pb) and zinc (Zn) in the high metal biosolids were 45, 958,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Frankia; Cadmium; Lead; Zinc.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000400006

ALTERNATIVAS DE APLICAÇÃO DO "DRIS" À CULTURA DE CAFÉ CONILON (Coffea canephora Pierre)
Provedor de dados: 63
Autores: Wadt,Paulo Guilherme Salvador; Novais,Roberto Ferreira de; Alvarez Venegas,Victor Hugo; Bragança,Scheilla Maria.
O sistema integrado de diagnose e recomendação (DRIS) tem sido indicado como alternativa para a avaliação nutricional das plantas, em relação ao método tradicional de interpretação da concentração dos teores foliares pelo critério do nível crítico. Esse trabalho objetivou avaliar a aplicação de diferentes métodos do DRIS (de Jones, de Elwali &amp;amp; Gascho e de Rathfon &amp;amp; Burger) em dados oriundos de lavouras comerciais cafeeiras, do estado do Espírito Santo, nos anos agrícolas de 1986/87, 1987/88 e 1988/89. Adicionalmente, avaliou-se a validade da adoção do teste F na seleção das relações para o cálculo desses índices. A adoção do teste F mostrou-se promissora, pois melhorou a capacidade do DRIS em discriminar as lavouras nutricionalmente...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coffea canephora; Nitrogênio; Fósforo; Potássio; Cálcio; Boro; Ferro; Adubação; DRIS.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000100013

Morphological variation in Paspalum nicorae Parodi accessions, a promising forage
Provedor de dados: 63
Autores: Reis,Camila Aparecida de Oliveira dos; Dall'Agnol,Miguel; Nabinger,Carlos; Schifino-Wittmann,Maria Teresa.
Paspalum nicorae Parodi is a perennial, apomictic tetraploid forage species, native in the state of Rio Grande do Sul, Brazil, with grazing tolerance and adapted to sandy soils and moderate droughts. As a first step to future breeding, a morphological characterization regarding leaf hairiness, sheath, leaf and central venation color, growing habit, plant height, raceme number and length, and leaf length and width was performed in 53 accessions from Rio Grande do Sul that are part of a Paspalum species breeding program. 35.84% of the accessions had completely hairy leaves, 73.58% had green sheath, 54.71% whitish central venation, 50.94% decumbent habit. Leaf color was estimated by two methods, color chart and colorimeter. The accessions were classified as...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Apomixis; Forage grass; Morphology; Plant breeding.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000200003

Survival and mutant production induced by mutagenic agents in Metarhizium anisopliae
Provedor de dados: 63
Autores: Kava - Cordeiro,V.; Luna - Alves - Lima,E.A.; Azevedo,J.L.
A wild strain of Metarhizium anisopliae, an entomopathogenic fungus, was submitted to three mutagenic agents: gamma radiation, ultraviolet light and nitrous acid. Survival curves were obtained and mutants were selected using different mutagenic doses which gave 1 to 5% survival. Morphological and auxotrophic mutants were isolated. Morphological mutants were grouped in a class with yellow conidia and other with pale vinaceous conidia as opposed to the green wild type conidia. Auxotrophic mutants had requirements for vitamin and aminoacid biosynthesis. More than 58% of the total auxotrophk mutants required proline/aipnine. Gamma radiation showed to be the most efficient mutagenic agent giving 0.2% of auxotrophk mutants followed by ultraviolet light (0.12%)...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Metarhizium anisopliae; Auxotrophk mutants; Colour mutants; Mutagenic agents; Gamma radiation; Ultraviolet light; Nitrous acid.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000300023

Imobilização da inulinase de Kluyveromyces marxianus para a hidrólise de extratos de Helianthus tuberosus L.
Provedor de dados: 63
Autores: Gaspari,Jefferson Willians de; Gomes,Luiz Humberto; Tavares,Flavio Cesar Almeida.
Este trabalho estudou a imobilização da inulinase de Kluyveromyces marxianus em diferentes suportes, com a finalidade de promover a bioconversão da inulina de Helianthus tuberosus. A inulina de H. tuberosus foi extraída dos tubérculos, desproteinizada e concentrada a 25% de açúcares redutores totais (ART). A inulinase de K. marxianus foi concentrada em evaporador rotativo e imobilizada em quitina (com e sem glutaraldeído), alginato sódico (concentrações de 2 e 4%), pectina, membrana de diálise e sílica de porosidade controlada (SPC). Em quitina obteve-se taxas de imobilização de 73Unidades/g com glutaraldeído e 48 U/g sem glutaraldeído, mas a hidrólise foi baixa em ambos os tratamentos, o equivalente a 2,4% por hora. Em gel de alginato sódico, nas...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Helianthus tuberosus; Enzima; Inulinase; Inulina.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000500015

Mass-rearing of Mediterranean fruit fly using low-cost yeast products produced in Brazil
Provedor de dados: 63
Autores: Silva Neto,Alberto Moreira da; Santos,Tatiana Rodrigues de Oliveira; Dias,Vanessa Simões; Joachim-Bravo,Iara Sordi; Benevides,Leandro de Jesus; Benevides,Clicia Maria de Jesus; Silva,Mariangela Vieira Lopes; dos Santos,Deise Cristina Campos; Virgínio,Jair; Oliveira,Givanildo Bezerra; Walder,Julio Marcos Melges; Paranhos,Beatriz Aguiar Jordão; Nascimento,Antônio Souza do.
Ceratitis capitata is one of the most important pests of fruits for exportation, and Sterile Insect Technique (SIT) has been the most efficient and environmental friendly technique used to control fruit fly populations around the world. A key goal in achieving a successful SIT program is a mass rearing system producing high quality insects at low cost. Providing adults with an artificial diet containing hydrolysed protein has been the major obstacle for bio-production facilities in Brazil, because it is expensive and has to be imported. Two other commercial products, autolysed yeast (AY) and yeast extract (YE), of domestic origin and low cost, were tested as substitutes of the imported hydrolyzed protein. To compare their efficiency we observed the female...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ceratitis capitata; Protein; Artificial diet; Rearing facility.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162012000600004

INFLUÊNCIA DO ANELAMENTO E ESTIOLAMENTO DE RAMOS NA PROPAGAÇÃO DA LARANJEIRA VALÊNCIA (Citrus sinensis Osbeck) ATRAVÉS DE ESTACAS
Provedor de dados: 63
Autores: CASTRO,A.M.; KERSTEN,E.
Objetivando estudar a influência do condicionamento de ramos, através do anelamento e estiolamento parcial, sobre o enraizamento de estacas de laranjeira cv. Valência, conduziu-se o experimento no período de fevereiro a dezembro de 1993. Para o anelamento foi utilizado arame fino de cobre com o qual provocou-se um estrangulamento na base do ramo. No estiolamento, utilizou-se fita preta de polietileno, que foi enrolada na base das brotações. De cada ramo condicionado, obteve-se apenas uma estaca com 15 cm de comprimento, diâmetro médio de 0,5 cm e um par de folhas apicais, cortadas pela metade. O plantio das estacas foi realizado em 12.04.93, em substrato de areia lavada e peneirada. Adotou-se o delineamento inteiramente casualizado, em esquema fatorial...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anelamento; Estiolamento; Propagação vegetativa; Laranjeira Valência; Estacas.
Ano: 1996
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161996000200001

Efeitos de filtros de Poncirus trifoliata e de alturas de enxertia na laranjeira valencia enxertada em limão-cravo
Provedor de dados: 63
Autores: Sampaio,V.R.
Foram estudados os efeitos de nitros de Poncirus trifoliata (5-10-20 cm) e de variações nas alturas de enxertia (15-25-35 cm) para a combinação laranjeira Valencia sobre Limão-cravo. O experimento implantado a 28/11/84 teve sua avaliação final realizada em outubro de 1992 e permitiu as seguintes conclusões: 1) O emprego de filtros de Poncirus trifoliata resultou em redução no tamanho das plantas; provocou atraso no início de frutificação e menores produções de frutos; 2) Dentro dos limites estudados, as variações nas extensões dos filtros e nas alturas de enxertia não afetaram o desenvolvimento e as produções das plantas.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Citrus; Filtro; Alturas de enxertia; Laranja Valência.
Ano: 1993
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161993000300007

Nitrogen 15 abundance in protein fractions of beans fertilized with (15NH4)2SO4
Provedor de dados: 63
Autores: Chaud,Saula Goulart; Oliveira,Admar Costa de; Trivelin,Paulo César Ocheuze.
Studies evaluating the protein nutritive value of beans labelled with 15N, ussing nitrogen balance and the quantitation of faecal and urinary endogenous nitrogen, determined by isotopic dilution, have been extensively used. The objective of this research was to verify if the isotopic labelling of raw, freeze dried beans (Phaseolus vulgaris L., cultivar Piratã 1) with 1.394 atoms%15N, resulted in the same abundance of the whole flour and of the protein fractions extracted from the beans with 0.5 mol L-1 NaCl. The isotopic abundance found in the whole bean flour, in the protein extract, in the globulin and albumin fractions were respectively: 1.394 ± 0.011; 1.403 ± 0.012; 1.399 ± 0.007 and 1.399 ± 0.028 atoms % of 15N, presenting no difference (P &gt; 0.05)....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phaseolus vulgaris L.; Stable isotopes; Isotopic label; Nutritive value; Experimental nutrition.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000400023

Water relations and photosynthesis as criteria for adequate irrigation management in 'Tahiti' lime trees
Provedor de dados: 63
Autores: Silva,Cláudio Ricardo da; Folegatti,Marcos Vinícius; Silva,Tonny José Araújo da; Alves Júnior,José; Souza,Claudinei Fonseca; Ribeiro,Rafael Vasconcelos.
Irrigation scheduling based on soil moisture status is one of the most useful methods because of its practicality and low cost. The effects of available soil water depletion on evapotranspiration (ETc), transpiration (E), leaf water potential at predawn (psiP) and midday (psiM), stomatal conductance (gs) and net CO2 assimilation (A) in lime 'Tahiti' trees (Citrus latifolia) were evaluated to improve irrigation schedule and minimize water use without causing water stress. The trees were spaced 7 &lt;FONT FACE=Symbol&gt;´&lt;/FONT&gt; 4 m and drip-irrigated by four drippers with the available soil water content (AWC) depleted by suspension of irrigation (40 days). Leaf water potential was measured on a pressure chamber (psiP and psiM) and leaf gas exchange...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Evapotranspiration; Citrus; Lysimeter; Gas exchange; Tensiometer.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000500001

Fatty acid composition of commercially important fish from Brazil
Provedor de dados: 63
Autores: Gutierrez,L.E.; Silva,R.C.M. da.
Total fat and fatty acid composition of seven fresh-water and nine marine fish commercially important in Brazil were determined. Palmitic acid was the predominant saturated fatty acid in both freshwater and marine fish. In the fat from freshwater fish the total C-16 fatty acids were higher than in marine fish. Oleic acid was the most abundant monounsaturated fatty acid and it was found in higher levels in freshwater fish. The data revealed that most freshwater fish from Brazil examined were a poor source of eicosapentaenoic (20:5) and docosahexaenoic (22:6) acids. Of the marine fish analysed, only sardine and manjuba could be recommended as a good sources of n-3 fatty acids.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fatty acids; Fish; Lipids; Ômega-3.
Ano: 1993
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161993000300023

Comportamento do pessegueiro 'douradão' em Itupeva
Provedor de dados: 63
Autores: Barbosa,Wilson; Ojima,Mário; Dall' Orto,Fernando Antonio Campo.
Plantas do novo cultivar Douradão, observadas em Itupeva, SP (23º05'S), sob espaçamento de 6 x 4m, apresentaram vigor médio e crescimento compacto. Com seis anos, suas copas atingiram volume de l3,4m3 em troncos de 437cm² de área de secção transversal. Os ramos produtivos desenvolveram 67 folhas de 43cm² por metro de ramo (m.r.) e 2,24 gemas.nó-1, sendo l,58 reprodutivas. As plantas floresceram entre 1 e 10 de julho, exibindo 65 flores rosáceas e auto-férteis.m.r.-1, 4l,3 anteras.flor1 e 1345 grãos de pólen.antera-1, com 58% de germinação in vitro. A frutificação efetiva foi de 44,9%, apresentando 18,1 e 8,2 frutos.m.r-1., antes e após o raleio respectivamente. Os frutos amadureceram no segundo decêndio de outubro, concomitante ao 'Aurora-1, e após 25 dias...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Prunus persica; Pêssego; Melhoramento.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000500030

Inheritance of rice cold tolerance at the seedling stage
Provedor de dados: 63
Autores: Cruz,Renata Pereira da; Duarte,Ismael Tiago de Lima; Cabreira,Caroline.
Rice (Oryza sativa L.) cold tolerance at the initial stages of development is a highly desirable trait to be incorporated into the state of Rio Grande do Sul, Brazil, cultivars, but selection for this trait must be performed under controlled temperature conditions, which limits the number of lines that can be evaluated. Knowledge of the inheritance of this trait is important to define breeding strategies. So the aim of this paper was to study the genetic basis of rice cold tolerance at the vegetative stage. Six genotypes with constrasting cold tolerance reactions were crossed in a diallel scheme without the reciprocals. The parents and the F1 and F2 generations were cultivated in a greenhouse until the V4 stage, when they were submitted to 10°C for ten...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Oryza sativa L.; Genetics; Low temperature; Vegetative stage.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000600008

In situ rumen degradation kinetics as affected by type of pasture and date of harvest
Provedor de dados: 63
Autores: Keim,Juan Pablo; Valderrama,Ximena; Alomar,Daniel; López,Ignacio Fernando.
Botanical composition affects the nutritive value and nutrient degradation kinetics of pastures. However, there is little information about pastures composed of various species. The present study was conducted to evaluate in situ degradation kinetics of dry matter (DM), crude protein (CP) and neutral detergent fiber (NDF) of a naturalized non fertilized pasture (NNF), naturalized fertilized pasture (NF), sown pasture with Lolium perenne L. and Trifolium repens L. (RGWC), and sown pasture with Bromus valdivianus Phil., Dactylis glomerata L., Holcus lanatus L., L. perenne and T. repens (MIXED); at three dates of harvest (early-spring, mid-spring and autumn). Duplicate bags were incubated in the rumen of three cannulated cows for 2, 4, 8, 12, 24 or 48 h....
Tipo: Info:eu-repo/semantics/article
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162013000600005

ANÁLISE QUANTITATIVA DE AMOSTRAS GEOLÓGICAS UTILIZANDO A TÉCNICA DE FLUORESCÊNCIA DE RAIOS X POR DISPERSÃO DE ENERGIA
Provedor de dados: 63
Autores: CARNEIRO,A. E. V; NASCIMENTO FILHO,V. F.
Este trabalho propõe uma metodologia para análise quantitativa de amostras geológicas, que apresentam uma considerável fração de elementos leves (número atômico Z &amp;lt; 13), utilizando a técnica de fluorescência de raios X por dispersão de energia, com excitação radioisotópica. O procedimento proposto baseia-se no método dos Parâmetros Fundamentais para a quantificação dos elementos analíticos (Z &lt;FONT FACE="Symbol"&gt;³&lt;/font&gt; 13) e na radiação de excitação espalhada coerente e incoerentemente para a quantificação da fração leve da matriz (Z &amp;lt; 13). Neste método, a relação entre a intensidade fluorescente e a concentração elementar foi estimada através da sensibilidade elementar e fator de geometria para a fluorescência, determinados com...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Análise quantitativa; Fluorescência de raios X; Amostras intermediárias; Energia dispersiva; Radiação espalhada.
Ano: 1996
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161996000100014

Doses e métodos de aplicação de nitrogênio em girassol
Provedor de dados: 63
Autores: Castro,Cesar de; Balla,Antal; Castiglioni,Vania Beatriz Rodrigues; Sfredo,Gedi Jorge.
O experimento foi conduzido com a cultura de girassol, em Latossolo Roxo eutrófico, durante as safras 91/92, 92/93 e 93/94. Avaliou-se o efeito das doses 0; 30; 60 e 90 kg ha-1 de nitrogênio (N) e dos métodos de aplicação deste nutriente 1. incorporado/aiveca (aplicado a lanço e incorporado com arado de aiveca a 30 cm de profundidade antes da semeadura); 2. incorporado/grade (aplicado a lanço e incorporado com grade de disco antes da preparação do leito de semeadura); 3. incorporado/grade/parcelado (30% N aplicado a lanço e incorporado com grade de disco antes da preparação do leito de semeadura e, 30 dias após a emergência das plantas, os 70% de N restantes em cobertura). Foram estudados os efeitos dos tratamentos na produção e peso de 1.000 aquênios,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Helianthus annuus; Girassol; Nitrogênio.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000400009

Movimentação de cátions em amostras de um Latossolo Vermelho-Amarelo incubadas com duas fontes de cálcio
Provedor de dados: 63
Autores: Wadt,Paulo Guilherme Salvada; Wadt,Lúcia Helena de Oliveira.
Estudou-se a movimentação de cátions alcalinos e alcalinos terrosos (CAAT) em colunas de solo arranjadas com amostras de Latossolo Vermelho-Amarelo, álico, coletadas a profundidade de 0 a 5cm sob dois tipos distintos de cobertura, floresta secundária e grama batatais (Paspalum notatum L.), as quais foram superpostas em potes plásticos à amostras do horizonte Bw, da mesma unidade de solo. Aplicaram-se carbonato de cálcio, sulfato de cálcio ou a mistura das duas fontes de cálcio às amostras superficiais, as quais foram colocadas a incubar e depois submetidas a sete aplicações de água destilada, na taxa de 1 volume-poro por semana, durante sete semanas consecutivas. O lixiviado foi recolhido semanalmente e analisado para cálcio, magnésio, potássio e sulfato...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Carbonato de cálcio; Sulfato de cálcio; Lixiviação; Gesso agrícola; Calagem.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000500018

Leaf area index of ground covers in a subtropical watershed
Provedor de dados: 63
Autores: Xavier,Alexandre Cândido; Vettorazzi,Carlos Alberto.
Leaf Area Index (LAI), an important structural variable descriptive of vegetation, is directly related to evapotranspiration and productivity. The objective of this work was to measure and analyze monthly LAI of different ground covers in a subtropical watershed. A field campaign to collect monthly LAI data was carried out during the year 2001, with a LAI-2000 (plant canopy analyzer) device, in sugarcane, pasture, corn, eucalypt, and riparian forest patches. Riparian forest presented a maximum LAI of 4.90; LAI values decreased as precipitation decreased, as it is a characteristic of this type of semideciduous vegetation. LAI for sugar cane presented the greatest variability throughout the year, related to plant characteristics and crop management in the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: LAI-2000; Plant canopy; Biophysical variable.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000300002

Egg Brochosomes of Proconiini (Hemiptera: Cicadellidae, Cicadellinae) species associated with cultivation of grapevines
Provedor de dados: 63
Autores: Azevedo Filho,Wilson Sampaio de; Botton,Marcos; Paladini,Andressa; Carvalho,Gervásio Silva; Ringenberg,Rudiney; Lopes,João Roberto Spotti.
Brochosomes production is considered a feature of Cicadellidae, and may represent an outstanding innovation which has played an important role in the development and diversification of this insect group. The objective of this study was to identify the species of Proconiini that produced egg brochosomes associated with grapevines in the Serra Gaúcha region of Brazil. Egg brochosome characteristics and an identification key are also discussed. The specimens were collected using yellow sticky cards in four vineyards (Vitis vinifera L.) from October 2004 to May 2006. Eight species capable of producing egg brochosomes were identified:Acrogonia citrina Marucci &amp;amp; Cavichioli; Homalodisca ignorata Melichar; Molomea consolida Schröder; Molomea lineiceps...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vitis vinifera; Oviposition; Leafhopper; Taxonomy.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000200015

Avaliação da atividade de microrganismos do solo em diferentes sistemas de manejo de soja
Provedor de dados: 63
Autores: Castro,O.M. de; Prado,H. do; Severo,A.C.R.; Cardoso,E.J.B.N.
Para avaliar o efeito do manejo do solo e de culturas sobre a atividade de Bradyrhizobium japonicum e de outros microrganismos importantes na ciclagem de nutrientes do solo, montou-se um experimento em casa de vegetação utilizando solo de um ensaio de campo com sistemas de manejo de resíduos e preparo bem distintos, como plantio direto e preparo convencional com arado de discos e diferentes rotações de cultura. O solo é um latossolo roxo distrófico, A moderado, textura argilosa. As culturas utilizadas no ensaio de campo foram soja contínua e em rotação com milho, sempre após aveia preta e Crolalaria juncea no outono-inverno, perfazendo portanto oito sistemas de manejo. Como testemunha, utilizou-se o solo de uma mata localizada próxima do experimento de...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Manejo do solo; Nodulação; Microrganismos do solo; Plantio direto; Soja.
Ano: 1993
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161993000200007

Exploring interactions of plant microbiomes
Provedor de dados: 63
Autores: Andreote,Fernando Dini; Gumiere,Thiago; Durrer,Ademir.
A plethora of microbial cells is present in every gram of soil, and microbes are found extensively in plant and animal tissues. The mechanisms governed by microorganisms in the regulation of physiological processes of their hosts have been extensively studied in the light of recent findings on microbiomes. In plants, the components of these microbiomes may form distinct communities, such as those inhabiting the plant rhizosphere, the endosphere and the phyllosphere. In each of these niches, the "microbial tissue" is established by, and responds to, specific selective pressures. Although there is no clear picture of the overall role of the plant microbiome, there is substantial evidence that these communities are involved in disease control, enhance...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Microbial communities; Rhizosphere; Endophytes; Phyllosphere.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162014000600013

Movement of Heterorhabditis amazonensis and Steinernema arenarium in search of corn fall armyworm larvae in artificial conditions
Provedor de dados: 63
Autores: Andaló,Vanessa; Santos,Viviane; Moreira,Grazielle F.; Moreira,Camila; Freire,Marcela; Moino Jr.,Alcides.
Spodoptera frugiperda (Smith, 1797) (Lepidoptera: Noctuidae) is considered to be the main pest of maize crops in Brazil. Entomopathogenic nematodes (EPN) may be used to control this pest and exhibit different, unique abilities to search for their hosts. The movement of EPN in relation to S. frugiperda was evaluated. To test for horizontal movement, a styrofoam enclosure filled with sand was divided into segments, nematodes were placed at the entrance to the enclosure and a larva was placed at the end of each division. The same approach was used to evaluate vertical movement; however, PVC pipes were used in this case. In general, the mortality was inversely proportional to the initial distance between host and nematodes. In the vertical displacement test,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Spodoptera; Biological control; Behaviour; Strategy; Entomopathogenic.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162012000300008

Identification of a non-host plant of Xylella fastidiosa to rear healthy sharpshooter vectors
Provedor de dados: 63
Autores: Marucci,Rosangela Cristina; Giustolin,Teresinha Augusta; Miranda,Marcelo Pedreira de; Miquelote,Helen; Almeida,Rodrigo Piacentini Paes de; Lopes,João Roberto Spotti.
Rearing leafhopper (Hemiptera: Cicadellidae) vectors free of Xylella fastidiosa is a requirement for studies of various aspects of vector-pathogen interactions. The selection of a plant that allows vector development but not bacterial multiplication is desirable to produce healthy vectors. In this study, two leafhopper hosts, Vernonia condensata ('boldo') and Aloysia virgata ('lixeira') were needle inoculated with citrus and coffee strains of X. fastidiosa to evaluate if these plants support pathogen colonization. The inoculated plants did not present symptoms and the pathogen was not detected by culture and PCR tests, neither soon after inoculation (7-14 days) nor later, at 1, 4, 6 and 12 months after inoculation. To obtain healthy adults of the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vernonia condensata; Citrus variegated chlorosis; Coffee leaf scorch; Sharpshooter vectors; Rearing technique.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000400010

Efeito do fósforo no desenvolvimento inicial de mudas de goiabeira serrana
Provedor de dados: 63
Autores: Nachtigal,J.C.; Kluge,R.A.; Rossal,P.A.L.; Vahl,L.C.; Hoffmann,A.
Foi estudado o efeito da adubação fosfatada no desenvolvimento inicial de mudas de goiabeira serrana (Feijoa sellowiana Berg.) num experimento em vasos, com solo Podzólico Vermelho Amarelo, apresentando 4 ppm de P extraível pelo método de Mehlich. Os níveis de fósforo utilizados foram 0, 50, 100 e 150 ppm de P, aplicados antes da instalação do experimento, juntamente com 150 ppm de K. Em cobertura, foram aplicados 150 ppm de N, em três parcelas iguais aos 7, 27 e 47 dias após a repicagem das mudas. Plântulas oriundas de sementes de plantas nativas, com aproximadamente 30 dias, foram transplantadas para os vasos e cultivadas durante 89 dias. Houve efeito significativo do P sobre todas as variáveis analisadas. A altura das plantas mostrou um comportamento...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Feijoa; Goiabeira serrana; Adubação; Fósforo.
Ano: 1994
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000200013

Adição de probiótico ao leite integral ou sucedâneo e desempenho de bezerros da raça holandesa
Provedor de dados: 63
Autores: Meyer,Paula Marques; Pires,Alexandre Vaz; Bagaldo,Adriana Regina; Simas,José Manuel Correia de; Susin,Ivanete.
A possibilidade de proibição do uso de antibióticos como promotores de crescimento para animais de produção tem feito com que consumidores e produtores procurem por alternativas. Os probióticos têm se mostrado promissores em cumprir este papel e por esta razão, setenta e nove bezerros da raça Holandesa foram utilizados para avaliar a adição de probiótico constituído por Lactobacillus acidophilus, Enterococcus faecium e Saccharomyces cerevisiae ao aleitamento. Os animais foram distribuídos em um delineamento inteiramente casualizado, com arranjo fatorial de tratamentos 3x2, correspondendo ao tipo de dieta líquida (leite integral, sucedâneo ao 3° dia ou sucedâneo ao 15° dia de idade, com adição ou não de probiótico). O período experimental foi do nascimento...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lactobacillus; Substituto do leite; Ganho de peso; Bezerro leiteiro; Bovino.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000200001

CONTROLE ASSOCIADO DE Cornitermes cumulans (KOLLAR, 1832) (ISOPTERA: TERMITIDAE) COM Metarhizium anisopliae, Beauveria bassiana E IMIDACLOPRID
Provedor de dados: 63
Autores: Neves,Pedro Janeiro; Alves,Sérgio Batista.
O objetivo desta pesquisa foi o de verificar em condições de campo a eficiência do controle associado de colônias de Cornitermes cumulans utilizando imidacloprid juntamente com fungos entomopatogênicos (Metarhizium anisopliae e Beauveria bassiana). Foram realizados experimentos de campo para determinar quais as concentrações mínimas de conídios e de imidacloprid que quando aplicadas em associação controlaram os ninhos de cupins, mas quando aplicadas em separado não foram eficientes. Isto ocorreu quando 500 mg de conídios do patógeno (M. anisopliae ou B. bassiana) foram misturados a 1,9 mg do produto comercial Gaucho 70 PM (imidacloprid) e 6 gramas do inerte calcene. Foi possível diminuir a concentração de conídios em até 4 vezes e a do inseticida...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cupim de montículo; Controle associado; Fungos entomopatogênicos.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000200008

Common moist diet replacement to promote sustainable Cobia Rachycentron canadum (Linnaeus) near- shore farming in Brazil
Provedor de dados: 63
Autores: Landuci,Felipe Schwahofer; Rombenso,Artur Nishioka; Pontes,Marcelo Duarte; Maia,Marcelo Pereira; Eler,Giselle; Araujo,Bruno Cavalheiro; Poersch,Luis Henrique da Silva.
ABSTRACT: Cobia is one of the most promising warm water aquaculture species. In Brazil, cobia farming began in 2008 in the state of Rio de Janeiro from experimental scale facilities to regular near-shore farms based on fresh/frozen fish diets composed mostly of Sardinella sp. Despite the encouraging results achieved in the promotion of sustainable cobia farming, we advocate the replacement of fresh/frozen fish by a practical formulated feed. This experiment evaluated the zootechnical performance and environmental efficiency of moist and practical formulated feeds in early grow-out phases in the cycle of cobia nearshore cage culture. Four hundred and twenty juvenile cobia (151 ± 7 g) were fed with moist feed and practical formulated feed for 56 days....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aquaculture; Environmental efficiency; Protein efficiency ratio; Nitrogen discharge; Marine fish farming.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162019001200139

Combining ability of recombined F4 papaya lines: a strategy to select hybrid combination
Provedor de dados: 63
Autores: Vettorazzi,Julio Cesar Fiorio; Santa-Catarina,Renato; Poltronieri,Tathianne Pastana de Sousa; Cortes,Diego Fernando Marmolejo; Azevedo,Alinne Oliveira Nunes; Miranda,Daniel Pereira; Santana,Josefa Grasiela Silva; Ramos,Helaine Christine Cancela; Pereira,Messias Gonzaga.
ABSTRACT: The growing demand for quality of papaya by the domestic and international markets requires the development of genotypes that are capable of incorporating traits, such as high yield and fruit quality. This study estimated the genetic parameters and the specific combining ability of F4 papaya lines crossed to the SS-72/12 tester to identify genotypes with higher genetic value for hybrid production. We evaluated 169 treatments consisting of 62 topcross hybrid combinations, 97 F5 lines, and 10 controls in a 13 × 13 lattice design with five replicates and two plants per plot. The following traits were evaluated: plant height (PH), stem diameter (SD), first-fruit insertion height (FFIH), number of marketable fruits (NMF), number of deformed fruits...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Carica papaya L.; Papaya breeding; Topcross; Genetic parameter.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000201102

Resíduos de sorgo e a mineralização do nitrogênio em LATOSSOLO VERMELHO fase cerrado
Provedor de dados: 63
Autores: Vasconcellos,Carlos Alberto; Marriel,Ivanildo Evodio; Santos,Fredolino Giacomini dos; Magalhães,Paulo César; Oliveira,Cristiane Abreu de.
As alterações de manejo exercem significativas modificações na qualidade e na quantidade da matéria orgânica, na quantidade e nas formas de N no solo e no processo de mineralização de N. Neste trabalho, avaliaram-se a taxa de mineralização do N e a variação de N-NH4+ e N-NO3- durante a decomposição dos resíduos de duas cultivares de sorgo. Os tratamentos seguiram o esquema fatorial 2x3x2, em blocos ao acaso, com dois manejos de solo, três resíduos culturais, dois níveis de nitrogênio e três repetições. Tubos de percolação foram montados com a adição de 20 g dos solos amostrados, misturados com 20 g de areia. A cada conjunto de solo mais areia, adicionou-se 0,1 g do resíduo cultural das cultivares de sorgo, com ou sem 50 mg kg-1 de N, na forma de nitrato de...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amônio; Nitrato; Cultivar; Resíduo vegetal.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000200022

Alteração de sabor e aroma em tomates causada por impacto
Provedor de dados: 63
Autores: Moretti,Celso Luiz; Sargent,Steven Alonzo.
Tomates (Lycopersicon esculentum Mill), 'Solar Set' e 'Agriset-743', foram colhidos no estádio verde-maduro (100% da superfície com coloração verde) e tratados com 100 miL L-1 de etileno gasoso a 20°C. Quando atingiram o estádio verde-rosado (menos do que 10% da superfície do fruto possui coloração vermelha ou amarelo-esverdeada), os frutos foram divididos em dois lotes. Um lote sofreu quedas de 40 cm de altura sobre uma superfície plana, rígida e lisa. Os frutos deste lote foram armazenados com os frutos-controle (que não sofreram dano mecânico) a 20°C e 85-95% de umidade relativa. No estádio vermelho, os frutos inteiros foram homogeneizados e um teste de análise sensorial foi imediatamente conduzido. Os painelistas foram capazes de distinguir entre...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lycopersicon esculentum; Análise sensorial; Injúria mecânica; Pós-colheita.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000300002

Teste de frio para avaliação do potencial fisiológico de sementes de algodão
Provedor de dados: 63
Autores: Miguel,Marcelo Hissnauer; Carvalho,Mariane Victorio de; Beckert,Osmar Paulo; Marcos Filho,Júlio.
O teste de frio tem sido usado principalmente para sementes de milho. Porém, seu uso em outras espécies como feijão, soja, algodão e ervilha tem crescido significativamente em todo o mundo. No entanto, ressalta-se a necessidade da padronização de metodologias do teste de frio de acordo com as características de cada espécie a ser testada. Dessa forma, com o objetivo de determinar a eficiência do teste de frio na avaliação do potencial fisiológico de sementes de algodão, cinco lotes do cultivar Delta Pine - Acala 90, deslintados quimicamente, foram submetidos a diferentes procedimentos: caixa com terra, rolo de papel com terra e rolo de papel sem terra, variando-se o período de exposição (três, cinco e sete dias) das sementes à baixa temperatura (10°C)....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gossypium hirsutum; Sementes; Análise; Vigor.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000400015

HABILIDADE DE INFECÇÃO DE ISOLADOS DE  Zoophthora radicans SOBRE Empoasca kraemeri
Provedor de dados: 63
Autores: LEITE,L.G; ALVES,S.B; WRAIGHT,S.P; GALAINI-WRAIGHT,S; ROBERTS,D.W.
Foram analisados e comparados os processos de germinação e habilidade de infecção dos isolados ARS-1590, ARS-1261 e ARS-1229 de Zoophthora radicans (Brefeld) Batko sobre ninfas do 5º ínstar de Empoasca kraemeri (Hoss &amp;amp; Moore) em ambiente de 20°C e 100% de umidade relativa. A formação de apressório e penetração dos isolados iniciaram-se dentro do período de seis horas após a inoculação. As penetrações dos isolados ocorreram em maior proporção no abdome, seguido do tórax e cabeça do inseto, tendo sido mais frequente nas membranas do corpo do que nos escleritos.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Insecta; Cigarrinha verde; Entomophthorales; Controle biológico.
Ano: 1996
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161996000100022

Liming and electrochemical attributes of an oxisol under no tillage
Provedor de dados: 63
Autores: Alleoni,Luís Reynaldo Ferracciú; Zambrosi,Fernando César Bachiega; Moreira,Silvino Guimarães; Prochnow,Luís Ignácio; Pauletti,Volnei.
No tillage areas are increasing in Brazil especially due to a general improvement in water and nutrient availability to plants. Few results have reported the effect of liming on soil electrochemical attributes in areas under the no tillage system. This study was conducted to evaluate the effect of liming (at the soil surface and incorporated to 0.2 m) on soil pH, point of zero salt effect (PZSE), electric potential, soil organic matter (SOM), and yield of soybean and corn, cultivated on an Typic Hapludox, submitted 12 years to no tillage. Rates of lime of 1/3, 2/3 and the total amount calculated for soil to reach a base saturation of 70 % (2.5 ton ha-1) were applied on soil surface. The full rate was also applied and incorporated to the 0.2 m depth. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: PSSE; Organic matter; Electric potential.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000100018

Physico-chemical properties and amino acid profiles of sap from Tunisian date palm
Provedor de dados: 63
Autores: Makhlouf-Gafsi,Ines; Mokni-Ghribi,Abir; Bchir,Brahim; Attia,Hamadi; Blecker,Christophe; Besbes,Souhail.
ABSTRACT Date palm sap (Phoenix dactylifera L.), also known as “legmi”, is a fresh juice extracted from date palm trees. The present study aimed to elucidate the effects of collection time (at the beginning of the tapping period and after seven days of collection) on the amino acid profile and physico-chemical properties of date palm sap from both male and female trees. Dry matter, protein, amino acid, and sugar profiles were determined using the Kjeldahl method, High-Performance Liquid Chromatography (HPLC), and High-Performance Anion-Exchange Chromatography with Pulsed Amperometric Detection (HPAEC-PAD), respectively. Date palm sap from both male and female trees contained high levels of carbohydrates. HPLC analysis showed that this fraction was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Male date palm; Female date palm; Time of sap collection; Sex discrimination.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000100085

Validation of a methodology for measuring nutrient digestibility and evaluation of commercial feeds for channel catfish
Provedor de dados: 63
Autores: Kitagima,Renato Eiji; Fracalossi,Débora Machado.
Channel catfish, a major freshwater aquaculture species in the US, is also farmed in Southern Brazil. However, apparent digestibility coefficients (ADC) of nutrients in commercial feeds available in Brazil for the species are not known. This study aimed at optimizing a methodology for fecal collection and determination of apparent nutrient digestibility for catfish. Pilot trials were carried out to establish gastrointestinal transit, fish density, and time interval between fecal collections. Gastrointestinal transit of dry feed for catfish varied from 11h30 to 10h30 for 100 and 172-g fish, respectively. Average dry weight of feces produced along a six day period by 99-g fish was 0.54 g, regardless of stocking density (10, 15 or 20 fish per 98-L cage; p...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nutrient availability; Fish nutrition; Siluriform fish; Channel catfish.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000500016

Variabilidade genética de etnovariedades de mandioca em regiões geográficas do Brasil
Provedor de dados: 63
Autores: Faraldo,Maria Inez Fernandes; Silva,Rainério Meireles da; Ando,Akihiko; Martins,Paulo Sodero.
O manejo empregado nas roças de agricultura autóctone, utilizando etnovariedades de mandioca (Manihot esculenta Crantz), apresenta papel de destaque na conservação in situ dos recursos genéticos. O presente trabalho teve por objetivo analisar a distribuição da variabilidade genética de 141 etnovariedades de mandioca coletadas em roças de diferentes regiões geográficas do Brasil, através de marcadores isoenzimáticos, revelados a partir de eletroforese em gel de amido. Foram avaliados 11 sistemas isoenzimáticos. Dos 15 locos polimórficos analisados a heterozigosidade média observada foi de 0,354. A estimativa coeficiente de diferenciação genética G ST apresentou valor médio de 8,80% da variabilidade genética entre as regiões. Na análise de agrupamento,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Manihot esculenta; Isoenzima; Dinâmica evolutiva; Roça.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000300020

Temporal progress and spatial patterns of quiescent diseases in guava influenced by sanitation practices
Provedor de dados: 63
Autores: Fischer,Ivan Herman; Soares-Colletti,Ana Raquel; Palharini,Maria Cecília de Arruda; Parisi,Marise Cagnin Martins; Amorim,Lilian.
ABSTRACT: Postharvest diseases are a major problem in guava crops as the symptoms normally appear during fruit ripening. This study aimed to detect and characterize the temporal dynamics and spatial patterns of the most important guava diseases in orchards with and without removal of crop residues as a sanitation practice. The experiment was conducted in an orchard of ‘Pedro Sato’ guavas, over two consecutive seasons, and data were collected from the flowering to the fruit ripening stage. In immature guavas treated with paraquat and ethrel, Colletotrichum spp. was detected from the 5th day of incubation. Anthracnose was detected in flowers at incidences higher than 50 % and black spot in fruit larger than 5.5 cm in length. The monomolecular and the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Colletotrichum; Guignardia; Psidium guajava; Postharvest fruit rot.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162017000100068

Conservação pós-colheita de abacates Persia americana Mill., variedades Fortuna  e Quintal, pOR IRRADIAÇÃO
Provedor de dados: 63
Autores: Germano,R.M. de A.; Arthur,V.; Wiendl,F.M.
O presente trabalho teve como objetivo determinar a dose de radiações gama do Cobalto-60 capaz de prolongar a vida de prateleira de frutos de abacate de duas variedades: Fortuna e Quintal, possibilitando por conseguinte, aumentar o período de sua comercialização. Os abacates após sua colheita foram mantidos sob duas condições: em temperatura ambiente, entre 21 e 24° C e umidade relativa entre 65 e 75%, e sob refrigeração, com temperatura entre 12 e 13,5° C e umidade relativa entre 45 e 55%. Foram feitas determinações do porcentual de perda de peso diário, determinações de dias de vida pós irradiação e resistência à penetração em suas cascas. Observou-se que as radiações na variedade Fortuna induziram um prolongamento na vida de prateleira que na testemunha...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Abacate; Radiações gama; Vida de prateleira; Refrigeração; Irradiação; Persia americana.
Ano: 1996
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161996000200010

Communication between agricultural scientists and statisticians: a broken bridge?
Provedor de dados: 63
Autores: Kozak,Marcin.
ABSTRACT Modern agricultural research requires a lot of statistics. Unfortunately, most up-todate statistical methods need advanced knowledge, often out of reach for agricultural researchers. Thus, efficient communication between researchers and statisticians is important for the development of agricultural knowledge. Many agricultural researchers claim that communication with statisticians is difficult. On the other hand, many statisticians claim that communication with agricultural researchers is not easy either. This being true, such poor communication can be a barrier to efficient agricultural research. The aim of this research is to study this phenomenon. Do agricultural researchers and statisticians see problems in their communication? What kinds of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cooperation; Expert study; Statistics.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000600505

Modificações químicas em solos ácidos ocasionadas pelo método de aplicação de corretivos da acidez e de gesso agrícola
Provedor de dados: 63
Autores: Ernani,Paulo Roberto; Ribeiro,Michele Schurmann; Bayer,Cimélio.
Os benefícios do calcário aplicado sobre a superfície do solo no rendimento vegetal podem estar associados à melhoria na composição química das águas de percolação. Esse trabalho objetivou avaliar alterações na fase sólida e na solução percolada em dois solos ácidos (Latossolo Bruno Álico e Cambissolo Húmico Álico), ocasionadas pelo método de aplicação (na superfície ou incorporado) de corretivos da acidez (CaCO3 e MgCO3) e de gesso agrícola. O CaCO3 foi utilizado na dose equivalente a 0,25 daquela necessária para elevar o pH a 6,0, e os demais em doses molares equivalentes. O CaCO3 foi ainda incorporado nas doses de 0; 0,5; 1,0 e 1,5 vez a necessidade de calcário para pH 6,0. Em colunas de lixiviação, com 1,5 kg de solo, percolou-se água destilada durante...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Calagem superficial; Percolação de íons; Cátions trocáveis.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000400026

Digital soil class mapping in Brazil: a systematic review
Provedor de dados: 63
Autores: Coelho,Fabrício Fernandes; Giasson,Elvio; Campos,Alcinei Ribeiro; Tiecher,Tales; Costa,José Janderson Ferreira; Coblinski,João Augusto.
ABSTRACT: In Brazil several digital soil class mapping studies were carried out from 2006 onwards to maximize the use of existing maps and information and to provide estimates for wider areas. However, there is no consensus on which methods have produced superior results in the predictive value of soil maps. This study conducts a systematic review of digital soil class mapping in Brazil and aims to analyze the factors which can improve the accuracy of digital soil class maps. Data from 334 digital soil class mapping studies were grouped and analyzed by Student's t-test, Wilcoxon-Mann-Whitney test and Kruskal-Wallis test. When conventional maps were used for validation, the studies showed average values of 63 % and when field samples were used, 56 % for...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pedology; Mapping unit density; Artificial neural networks; Soil-forming factors; Overall accuracy.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000501401

Sonic anemometry and sediment traps to evaluate the effectiveness of windbreaks in preventing wind erosion
Provedor de dados: 63
Autores: López,Alejandro; Valera,Diego Luis; Molina-Aiz,Francisco Domingo; Lozano,Francisco Javier; Asensio,Carlos.
ABSTRACT The present work analyzes the effectiveness of windbreaks against wind erosion through the study of streamline patterns and turbulent flow by means of sonic anemometry and sediment traps. To this end, windbreaks composed of plastic meshes (7.5 m long and 0.7 m tall) were used. Windbreaks are a good means to reduce wind erosion, as they produce a positive effect on the characteristics of air currents that are related to wind erosion processes. Due to their ease of installation and dismantling, plastic meshes are widely used in areas where they are not required permanently. In our study, the use of a mesh of 13 × 30 threads cm−2 and 39 % porosity resulted in an average reduction of 85 % in face velocity at a height of 0.4 m and a distance of 1 m...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Streamline patterns; Semiarid environment; Turbulent flow; Energy levels; Olive.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162017000600425

Toxicidade para lagartas de Phthorimaea operculella (Zell.) dos aleloquímicos 2-tridecanona e 2-undecanona presentes em tomateiro (Lycopersicon spp.)
Provedor de dados: 63
Autores: Ventura,M.U.; Vendramim,J.D.
Avaliou-se a toxicidade para Phthorimaea operculella (Zell.) dos aleloquímicos 2-trídecanona e 2-undecanona, presentes nos exsudatos glandulares dos tricomas de Lycopersicon spp. Determinou-se a toxicidade dos exsudatos de L. hirsutum f. glabratum PI134417 (DL50), do 2-tridecanona (dose letal: DL50 e concentração letal: CL50) e do 2-undecanona (CL50) para lagartas de primeiro ínstar desse inseto. A DL50 foi de 5,54 glândulas e 775,53 ng por lagarta, respectivamente. Em relação à concentração letal, o 2-tridecanona foi mais tóxico do que o 2-undecanona. A toxicidade (CL50) do 2-tridecanona aumentou com a elevação da temperatura de 27 para 32°C e para o 2-undecanona ocorreu o inverso. Concluiu-se que estes compostos podem ter grande importância na...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Insecta; Tomateiro; Praga; Resistência de plantas.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000300009

ADUBAÇÃO VERDE E ORGÂNICA PARA O CULTIVO DO AMENDOIM (Arachis hypogaea L)
Provedor de dados: 63
Autores: RODRIGUES FILHO,F.S.O; GERIN,M.A.N; IGUE,T; FEITOSA,C.T; SANTOS,R.R. dos.
No período de 1986/87 a 1993/94 foram conduzidos experimentos, em solo Podzólico Vermelho-Escuro, distrófico, textura média, de baixa fertilidade, na Estação Experimental de Monte Alegre do Sul do Instituto Agronômico de Campinas, com o objetivo de verificar os efeitos da monocultura do amendoim, em cultivo contínuo e não contínuo, da incorporação de biomassa de Mucuna aterrima (Piper &amp;amp; Tracy) Holland (mucuna preta) como adubação verde e da aplicação de esterco de galinha como adubação orgânica, sobre a produção do amendoim "das águas" e na variação dos teores de nutrientes no solo. O tratamento "amendoim-contínuo" foi o que proporcionou os mais baixos índices de produção da cultura, com média de oito anos de 1525 Kg/ha. O tratamento...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amendoim; Adubação verde e orgânica; Pousio; Nutrientes no solo; Arachis hypogaea.
Ano: 1996
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161996000100013

Growth of radiata pine families in nursery and two years after field establishment
Provedor de dados: 63
Autores: Meza,Sergio Enrique Espinoza; Ivković,Miloš; Arce,Marco Aliro Yáñez; Díaz,Carlos Renato Magni; Moya,Rómulo Eduardo Santelices; Ariza,Antonio María Cabrera.
ABSTRACT: Pinus radiata D. Don is the most widely planted exotic species in Australia, Chile, New Zealand and Spain. In this study, growth and survival of P. radiata were compared in 30 open pollinated families grown under two contrasting watering regimes in nursery (well-watered cf. water-stress conditions) and planted on a drought-prone site with Mediterranean climate in central Chile. This study assessed phenotypic plasticity in growth and survival at nursery stage and two years after establishment in the field. Family plasticity at nursery stage was estimated by the angular phenotypic change index (APCI), while the relationship between nursery and field traits was estimated by genetic correlations (rg) and the Pearson coefficient of correlation (rxy)....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pinus radiata; Survival; Phenotypic plasticity; Nursery-field correlations; Dry sites.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000301000

Iron sources for citrus rootstock development grown on pine bark/vermiculite mixed substrate
Provedor de dados: 63
Autores: Ferrarezi,Rhuanito Soranz; Bataglia,Ondino Cleante; Furlani,Pedro Roberto; Schammass,Eliana Aparecida.
For high technology seedling production systems, nutrition plays an important role, mainly the fertigation with iron chelates to prevent its deficiency. This study had the goal of searching for alternative iron sources with the same nutrient efficiency but lower cost in relation to nutrient solution total cost. An experiment was carried out in 56 cm³-conic-containers tilled with a pine bark/ vermiculite mixed substrate using Fe-DTPA, Fe-EDDHA, Fe-EDDHMA, Fe-EDTA, Fe-HEDTA, FeCl3, FeSO4, FeSO4+citric acid plus a control, and the rootstocks Swingle, Rangpur, Trifoliata and Cleopatra, in a randomized complete block design, with four replicates. Seedlings were evaluated for height, relative chlorophyll index, total and soluble iron leaf concentrations....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Seedling production; Chelates; Fertigation; Economical analysis.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000500010

Caracterização da chuva horária em três locais do Estado de São Paulo: um subsídio ao planejamento de operações agrícolas de campo
Provedor de dados: 63
Autores: Pezzopane,J.E.M.; Sentelhas,P.C.; Ortolani,A.A.; Moraes,A.V. De C.
Para caracterizar o comportamento das chuvas no decorrer do dia nos diferentes meses do ano, foram calculadas as médias dos totais e das freqüências das chuvas horárias para três locais: Campinas, Pindorama e Ubatuba, no período de 1957 a 1976. Os resultados obtidos mostram que existe diferença significativa no total de chuva horária nos meses de: novembro a março em Campinas; outubro a abril em Pindorama, e outubro a junho em Ubatuba. A freqüência horária das chuvas apresentou resultados semelhantes aos do total de chuva para Campinas e Pindorama. Em Ubatuba, a freqüência horária das chuvas apresentou diferença significativa durante todos os meses do ano. Durante os meses que apresentam diferenças significativas, o período da manhã mostra ser o mais...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chuva horária; Freqüência horária; Probabilidade.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000100013

Genetic control of seed dormancy and pre-harvest sprouting in wheat
Provedor de dados: 63
Autores: Andreoli,Claudinei; Bassoi,Manoel Carlos; Brunetta,Dionisio.
Pre-harvest sprouting (PHS) damage leads to occasional massive losses in all wheat producing areas, causing downgrading of grain quality, that severely limits end-use applications and results in substantial financial losses to farmers and food processors. Red grain color is a traditional marker for resistance to sprouting in wheat breeding programs, however red-grained genotype alone does not always guarantee effective resistance. The objective of this work was to find genes for resistance to PHS and investigate its inheritance in Brazilian wheat cultivars. Genetic variation for dormancy was investigated in the parents, F1 and 300 F2 lines derived from the cross Frontana × OR1 and its reciprocal. The germination/dormancy sprouted grains was evaluated on...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Triticum aestivum; QTL; Alpha-amylase; Digenic model; Phenotype.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000600009

Numerical modeling of actual evapotranspiration of a coffee crop
Provedor de dados: 63
Autores: Cesanelli,Andrés; Guarracino,Luis.
The evapotranspiration estimation has great importance to crop productivity and agricultural water management. In this study, evapotranspiration is analyzed in a coffee (Coffea arabica L.) crop located in Piracicaba, state of São Paulo (Brazil) using a numerical method based on the simulation of both water flow and crop activity in the unsaturated zone of the soil. Actual evapotranspiration is estimated from potential evapotranspiration using water stress functions, meteorological data, soil hydraulic parameters, crop coefficients and leaf area index values. Crop transpiration and soil evaporation are individually quantified improving the analysis of the evapotranspiration process. The numerical procedure can predict periods of crop water stress and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil evaporation; Crop transpiration; Unsaturated zone; Mathematical models.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000400001

Germinação e incidência de fungos em testes com sementes de Brachiaria brizantha Stapf.
Provedor de dados: 63
Autores: Dias,D.C.F.S.; Toledo,F.F. DE.
O presente trabalho teve por objetivo estudar o efeito da escarifícação com ácido sulfúrico e da aplicação de fungicidas (thiabendazol, captan, thiram e iprodione + thiram) nos resultados dos testes de germinação e no desenvolvimento de microrganismos sobre sementes de B. brizantha. Além dos testes de germinação, os quais foram avaliados quanto à incidência de microrganismos aos 10 e 21 dias, conduziram-se testes de sanidade, procurando-se identificar a microflora presente. A análise dos dados e interpretação dos resultados permitiram as seguintes conclusões: a escarificação com o ácido não promoveu acréscimo significativo na germinação, tendo contribuído para a redução do nível de incidência de fungos ao se comparar com a testemunha. Os fungicidas...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brachiaría brizantha; Sementes; Germinação; Escarifícação; Fungos; Fungicidas.
Ano: 1993
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161993000100011

Association mapping of drought tolerance indices in wheat: QTL-rich regions on chromosome 4A
Provedor de dados: 63
Autores: Ballesta,Paulina; Mora,Freddy; Del Pozo,Alejandro.
ABSTRACT Drought is likely the main abiotic stress that affects wheat yield. The identification of drought-tolerant genotypes represents an effective way of dealing with the continuous decrease in water resources as well as the increase in world population. The aim of this study was to identify single nucleotide polymorphisms (SNP) associated with drought tolerance indices in wheat by using a genome-wide association study (GWAS) under fully irrigated and rain-fed conditions. The drought tolerance indices (i.e., Stress Susceptibility Index, Stress Tolerance Index, Tolerance Index and Yield Stability Index) were calculated based on grain yield, 1,000-kernel weight and kernels per spike. The association panel was genotyped using genotyping-by-sequencing...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: SNP markers drought; Genome-wide association study; Rain-fed conditions.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000201101

Programas de suplementação alimentar: impacto sobre algumas variáveis econômicas
Provedor de dados: 63
Autores: Furtuoso,M.C.O.
Procurou-se avaliar quantitativamente as conseqüências de programas de suplementação alimentar sobre o desempenho de algumas variáveis econômicas. Para tal, utilizamos um modelo de insumo-produto verificando o seu impacto sobre os níveis de produção, importação e emprego. Trata-se de um exercício de simulação de estática comparativa que analisa estados de equilíbrio da economia sob hipóteses alternativas de consumo final. Duas alternativas de consumo, no setor indústria do leite e laticínios, correspondentes a hipotéticos gastos do governo no Programa Nacional do Leite para Crianças Carentes (PNLCC) foram testadas. Os resultados das simulações sugerem ser possível um estímulo ao setor estudado da ordem de 15%, como também verificou-se impacto expressivo...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Insumo-produto; Programas de suplementacão aumentar.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000200032

Sample size and prediction of weight and yield of individual cuts from Braford steers pistol hindquarters
Provedor de dados: 63
Autores: Cardoso,Leandro Lunardini; Tarouco,Jaime Urdapilleta; MacNeil,Michael D.; Lobato,José Fernando Piva; Dambrós,Mara Célia; Freitas,Aline Kellermann de; Devincenzi,Thais; Feijó,Fernanda Dorneles; Cardoso,Fernando Flores.
ABSTRACT Two hundred seventeen grass-finished Braford steers were assessed by ultrasonic scanning and subsequently harvested with their pistol hindquarters fabricated into boneless wholesale cuts. The Longissimus thoracis muscle area and subcutaneous fat depths were measured. The objectives of this study were: 1) to develop prediction equations for weights of the pistol hindquarter and high-value commercial cuts, and 2) to estimate sample size needed for experiments comparing pistol hindquarter retail product weight using either physically or ultrasonically measured carcass traits. Carcass measurements explained 44 % to 94 % of the variation in weights of individual cuts, whereas, measurements that were made using ultrasound explained 42 % to 90 % of the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cattle; Carcass; Models; Ultrasound.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000400401

Technological quality and utilization of potato tubers
Provedor de dados: 63
Autores: Feltran,José Carlos; Lemos,Leandro Borges; Vieites,Rogério Lopes.
Increasing concerns have been verified with regard to the quality factor of potato tubers and their correct form of use and consumption. The purpose of this research was to determine the technological quality of potato tuber cultivars and identify the best forms of use and consumption. A completely randomized experimental design was adopted with 18 treatments represented by cultivars Agata, Apuã (IAC-5977), Aracy (IAC-2), IAC Aracy Ruiva, Asterix, Bintje, Dali, Clone IAC-6090, Itararé (IAC-5986), Laguna, Remarka, Liseta, Mondial, Novita, Oscar, Picasso, Santana, and Solide, with four replications. Specific gravity showed a positive correlation with starch content, texture, pulp pH, and soluble solids, and was negatively correlated with reducing sugars. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Solanum tuberosum; Dry matter; Reducing sugars; Starch content.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000600006

Optimization of in vitro organogenesis in passion fruit (Passiflora edulis f. flavicarpa)
Provedor de dados: 63
Autores: Trevisan,Flavio; Mendes,Beatriz Madalena Januzzi.
In vitro organogenesis of passion fruit was studied by the induction of adventitious buds from leaf discs in culture media supplemented with benzyladenine (BAP) or thidiazuron (TDZ). To minimize adverse effects of ethylene accumulation on shoot development, silver nitrate (AgNO3) was added to the induction media. Both BAP (0; 2.2; 4.4; 6.6 µmol L-1) and TDZ (0; 1.1; 2.2; 3.4 µmol L-1) were effective in promoting shoot development. Although no significant differences were detected using AgNO3 (23.5 µmol L-1), buds grown in AgNO3-supplemented media were more vigorous. The number of explants with buds obtained using TDZ and AgNO3-supplemented media (5.6) were higher than those obtained using BAP and AgNO3 (3.0). MSM + giberrellic acid (GA3), MSM + coconut...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Ethylene; Silver nitrate; Thidiazuron; Tissue culture.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000400007

EFEITOS DO TRATAMENTO COMBINADO DE IRRADIAÇÃO GAMA E REFRIGERAÇÃO NO CRESCIMENTO DE LEVEDURA (Saccharomyces cerevisiae Hansen) EM SUCO DE LARANJA
Provedor de dados: 63
Autores: DOMARCO,R.E; SPOTO,M.H.F; WALDER,J.M.M; BLUMER,L; MATRAIA,C.
O efeito da radiação gama e baixas temperaturas foi estudado no crescimento de Saccharomyces cerevisiae em suco de laranja. O suco concentrado de laranja (65°Brix) foi diluído a 10,5°Brix e inoculado com levedura comercial. As amostras foram irradiadas com doses de 1,0, 1,5, 2,0, 2,5, 5,0 e 7,5 kGy (Cobalto 60), a uma taxa de dose de 2,83 kGy/h. Todas as amostras foram armazenadas a 0°, 5° e 25°C, por 1, 7, 14, 21, 30, 60 e 90 dias. O tratamento combinado de 1 kGy e refrigeração a 0°C foi efetivo para a conservação do suco de laranja por 90 dias de armazenamento. A dose de 2,5 kGy foi suficiente para conservar o suco de laranja por 90 dias de armazenamento a 5°C. A 25°C, somente as doses mais altas (5 e 7,5 kGy) foram efetivas no controle do crescimento da...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Irradiação; Suco de laranja; Saccharomyces cerevisiae.
Ano: 1996
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161996000100003

Crop losses in Brazilian cassava varieties induced by the Cassava common mosaic virus
Provedor de dados: 63
Autores: Venturini,Marcela Tonini; Araújo,Taylane da Silva; Abreu,Emanuel Felipe Medeiros; Andrade,Eduardo Chumbinho de; Santos,Vanderlei da Silva; Silva,Marcos Roberto da; Oliveira,Eder Jorge de.
ABSTRACT Despite the widespread distribution of the Cassava common mosaic virus (CsCMV) in Brazil, little is known about the losses it causes in yield. The effect of CsCMV on different varieties was evaluated by reference to several agronomic traits. Four field trials were established in 2012/2013 and 2013/2014 using six varieties of cassava. Following mechanical inoculation with CsCMV, the presence of the virus was confirmed using the ELISA assay. The evaluated traits were plant height (PH), dry matter content (DMC), harvest index (HI), aerial part yield (APY), root yield (RoY), and starch yield (StY) in both inoculated and non-inoculated plants. Overall, the presence of the virus contributed little to the reduction in PH, HI, and DMC across the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Manihot esculenta Crantz; Viruses; Root yield; Disease.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000600520

Microsatellite markers for identification of Prunus spp. rootstocks
Provedor de dados: 63
Autores: Bianchi,Valmor João; Sansavini,Silviero; Fachinello,José Carlos.
Cultivar characterization for fruit trees certification requires fast, efficient and reliable techniques. Microsatellite markers (SSR) were used in the molecular characterization of 29 Prunus spp. rootstocks. The DNA from the rootstocks was analyzed using five pre-selected SSR primers (UDP96-005, UDP96-008, UDP96-013, UDP96-18 and UDP98-414) and revealed 81 alleles, which allowed each genotype to be identified. The UDP96-005 marker generated the most information, i.e., 23 well-distributed, polymorphic alleles among all genotypes. The 21 polymorphisms produced by UDP96-013 occurred mainly as a result of high degree of variability among genotypes of the Prunophora subgenus. In the dendrogram, the five markers allowed the 29 rootstocks to be grouped into...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Peach tree; SSR; Fingerprinting.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000300011

'Aroeira-branca' [Lithraea molleoides (Vell.) Engl. - Anacardiaceae] seed quality evaluation by the X-ray test
Provedor de dados: 63
Autores: Machado,Cibele Ferreira; Cícero,Sílvio Moure.
'Aroeira-branca', an arboreal species of great ecological and economic importance, is seed propagated and presents limitations with respect to the availability of methods for seed quality evaluation. The X-ray test has been considered of potential value because it is accurate, quick and nondestructive. In this context, the objective of this work was to verify the possibility of this test to detect damage and/or abnormalities in aroeira-branca embryos, in an attempt to correlate these anomalies to germination. Four seed lots were collected in different locations in the southern region of the State of Minas Gerais, Brazil, during 2001. The X-ray test consisted of submitting 100 seeds/lot to radiation (exposure of seeds to radiation of 13 kV/5 minutes) and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Radiography; Embryo morphology; Seed germination; Forest species.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000200026

Chlorophyll fluorescence of the testa of Brassica oleracea seeds as an indicator of seed maturity and seed quality
Provedor de dados: 63
Autores: Jalink,H.; Frandas,A.; Schoor,R. van der; Bino,J.B.
Chlorophyll fluorescence of the testa of seeds is proposed as a non-invasive method for the determination of maturity and quality of seeds. In this study cabbage seeds (Brassica oleracea) were sorted individually based on the chlorophyll fluorescence signals into four subsamples labeled with respect to their chlorophyll fluorescence signal (low, medium, high and very high). The results show that the magnitude of the chlorophyll fluorescence signal was inversely related to the quality of the seeds, expressed as germination %, normal seedling %, germination rate (T50) and uniformity of germination (T75-T25). The seed lot could be improved from 90 to 97% normal seedlings by sorting out 13% of the seeds with very high chlorophyll fluorescence signals....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Maturation; Chlorophyll fluorescence; Cabbage seed; Sorting; Quality.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000500016

Phosphorus distribution and availability in untreated and mechanically separated biogas digestates
Provedor de dados: 63
Autores: Bachmann,Silvia; Uptmoor,Ralf; Eichler-Löbermann,Bettina.
ABSTRACT Biogas digestates contain valuable nutrients but also have high water contents. Di-gestates were sampled from two different biogas facilities before and after solid-liquid separation and were analyzed with regard to their composition and phosphorus (P) fractions. Additionally, to investigate the P fertilizer effects of these digestates in comparison with undigested slurry or TripleSuper-P (TSP), they were applied in a pot experiment (6 kg soil per pot) in an amount corresponding to 200 mg P per pot in combination with various crops (amaranth, maize, maize + beans mixed cropping, sorghum). A separation of digestates resulted in higher P concentrations of the solid fraction in comparison with the liquid fraction. The proportion of the readily...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phosphorus fractions; Anaerobic digestion; Amaranth; Mixed cropping; Soil enzymes.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000100009

Variação sazonal da fotossíntese, condutância estomática e potencial da água na folha de laranjeira 'Valência'
Provedor de dados: 63
Autores: Machado,Eduardo Caruso; Medina,Camilo Lázaro; Gomes,Mara de Menezes de Assis; Habermann,Gustavo.
Em espécies perenes podem ocorrer variações nas taxas de trocas gasosas e nas relações hídricas em função da variação das condições ambientais, durante os diferentes meses do ano. Avaliaram-se, em laranjeira ´Valência´ enxertada sobre quatro espécies de porta-enxerto, mantida sem deficiência hídrica, as taxas de fotossíntese (A) e de transpiração (E), a condutância estomática (g) e o potencial da água na folha (psi f ), medidos nos períodos da manhã (9h00 às 11h00) e da tarde (13h00 às 15h00) nos meses de janeiro, março e julho em Campinas - SP. As espécies de porta-enxertos não tiveram efeitos sobre as variáveis medidas. Independente do porta-enxerto A, g e &lt;FONT FACE=Symbol&gt;Y &lt;/FONT&gt;f foram menores no período da tarde. A queda de A deve estar...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Citrus sinensis; Trocas gasosas; Transpiração; Crescimento.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000100007

Stomatal behavior and components of the antioxidative system in coffee plants under water stress
Provedor de dados: 63
Autores: Deuner,Sidnei; Alves,José Donizeti; Zanandrea,Ilisandra; Goulart,Patrícia de Fátima Pereira; Silveira,Neidiquele Maria; Henrique,Paôla de Castro; Mesquita,Alessandro Carlos.
Coffee (Coffea arabica) plants show a positive relationship between stomatal closure and formation and accumulation of H2O2. However, for coffee plants under water restriction such relationship has never been studied. The objective of the present study was evaluate the stomatal movement and the antioxidant capacity of coffee seedlings under different water regimes. Eight months old coffee seedlings of cv. Catuaí IAC 99 were submitted to field capacity, gradual and total suspension of irrigation during a period of 21 days. Evaluations of leaf water potential (Ψw) were performed in the beginning of the morning, and stomatal resistance, transpiration rate and vapor pressure deficit were determined at 10 am and 5 pm. All biochemical and enzymatic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coffea arabica; Oxidative stress; Antioxidants; Water stress.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000100012

Métodos para avaliar a qualidade fisiológica de sementes de arroz
Provedor de dados: 63
Autores: Menezes,N.L. de; Silveira,T.L.D. da.
Com o objetivo de avaliar a eficiência de diferentes métodos para a determinação da qualidade fisiológica de sementes de arroz, foram utilizados dois grupos de dez lotes de sementes, das variedades BR-IRGA 409 e BR-IRGA 410. A qualidade dos lotes foi determinada através do teor de água, peso de mil sementes, teste de germinação e dos testes de vigor: primeira contagem de germinação, classificação do vigor de plântulas, envelhecimento acelerado, teste de frio modificado, tamanho e massa seca de plântulas e emergência no campo. Concluiu-se que os testes de frio modificado e classificação do vigor de plântulas são capazes de estratificar diferentes lotes de arroz pelo vigor e se correlacionam positivamente com a emergência no campo. O teste de envelhecimento...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Oryza sativa; Germinação; Testes de vigor.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000200025

Influence of high temperature on the reproductive biology of dry edible bean (Phaseolus vulgaris L.)
Provedor de dados: 63
Autores: Silva,Daiana Alves da; Pinto-Maglio,Cecília Alzira Ferreira; Oliveira,Érica Cristina de; Reis,Raquel Luiza de Moura dos; Carbonell,Sérgio Augusto Morais; Chiorato,Alisson Fernando.
ABSTRACT: The aim of this study was to investigate the effect of heat stress on 12 bean genotypes through the analysis of their reproductive biology in terms of flowering, pollen viability, meiotic behavior, and production. Plants were grown in a climate chamber at 25-20 °C (day and night) and at a high temperature treatment 37-26 °C (day and night) from the vegetative (V4) development stage to physiological maturity. The experimental design was 2 × 12 factorial arrangement with six replications and the factors consisted of heat treatments and genotypes. In three replications, the number of newly opened flowers was checked daily. At physiological maturity, the following traits were evaluated: percentage of pod set, number of pods, number of viable seeds,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Common bean; Heat stress; Pollen viability; Meiosis; Seed yield.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000301100

Radiação gama na conservação do suco natural de laranja
Provedor de dados: 63
Autores: Iemma,Juliana; Alcarde,André Ricardo; Domarco,Rachel Elisabeth; Spoto,Marta Helena Fillet; Blumer,Lucimara; Matraia,Clarice.
Este trabalho estudou o efeito da radiação gama na população microbiológica, teor de sólidos solúveis, acidez titulável, pH and conteúdo de vitamina C do suco natural de laranja. A atividade microbiana pode causar a deterioração do suco de laranja. A irradiação é um processo de conservação de alimentos através da eliminação dos microrganismos, porém pode afetar algumas características do produto. O delineamento experimental foi em esquema fatorial 4x5 referentes ao controle mais 3 doses de radiação (2,0; 4,0 and 6.0 kGy) e 5 períodos de armazenamento (1, 7, 14, 21 e 28 dias) com 2 repetições. As amostras de suco natural foram extraídas de laranjas da variedade "Pêra", irradiadas a uma taxa de dose de 2,0 kGy por hora (cobalto-60), e em seguida foram...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Radiação gama; Suco de laranja; Conservação.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000500022

Crop management systems and maize grain yield under narrow row spacing
Provedor de dados: 63
Autores: Strieder,Mércio Luiz; Silva,Paulo Regis Ferreira da; Rambo,Lisandro; Sangoi,Luís; Silva,Adriano Alves da; Endrigo,Paulo César; Jandrey,Douglas Batista.
Reduction in row spacing provides a more uniform distribution among plants that can increase grain yield. The benefits of narrow row spacing can depend on the plant architecture and on the kind of crop management system. The objective of this study was to assess the effects of narrow row spacing on the grain yield of maize hybrids growing under different management systems. Six experiments were carried out in Eldorado do Sul, State of Rio Grande do Sul, Brazil, during the 2003/04 and 2004/05 growing seasons. Each experiment corresponded to a crop management system. Treatments consisted of two row spacings (0.8 and 0.4 m), two hybrids (Penta and Flash) and two plant densities, which varied with the crop management system and growing season. Besides plant...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays; Plant arrangement; Hybrid; Yield components; Fertility and irrigation levels.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000400004

Avaliação do efeito da peletização sobre o vigor de sementes de alface (Lactuca sativa L.)
Provedor de dados: 63
Autores: Coraspe,H.M.; Gonzales Idiarte,H.; Minami,K.
Sementes de alface (Lactuca sativa L.) cv. Verônica, do tipo crespo, foram submetidas a testes de umidade, germinação, velocidade de germinação, envelhecimento acelerado, teste de frio, condutividade elétrica, e emergência. Os testes de laboratório não evidenciaram diferenças significativas da qualidade fisiológica entre sementes peletizadas e sem paletes, exceto o teste de envelhecimento acelerado. As correlações entre os testes de laboratório e a emergência em campo não foram significativas. A emergência em campo foi significativamente maior nas sementes peletizadas.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Alface; Lactuca sativa L.; Paletes; Vigor das sementes.
Ano: 1993
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161993000300005

Bioavailability of cadmium and lead in a soil amended with phosphorus fertilizers
Provedor de dados: 63
Autores: Mendes,Alessandra Monteiro Salviano; Duda,Gustavo Pereira; Nascimento,Clístenes Williams Araújo do; Silva,Michelangelo Oliveira.
Phosphorus fertilizers are essential to obtain high productivity, however, they contain heavy metals that can contaminate the soil and threat the health of animals and humans. The present study focused the determination of Cd and Pb concentrations in different phosphorus fertilizers as well as the absorption of these heavy metals by velvet green bean grown on soil amended with such fertilizers. The experiment was set up as a completely randomized design in a factorial scheme. The factors were four phosphorus sources (triple superphosphate-TS, Yorin thermophosphate-YT, Araxa rock phosphate-AP, and Gafsa rock phosphate-GP) applied at five rates (0, 92, 183, 275, and 366 kg ha-1 of P2O5). The data obtained were submitted to variance and regression analysis....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Heavy metals; Phytoextraction.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000400003

General procedure to initialize the cyclic soil water balance by the Thornthwaite and Mather method
Provedor de dados: 63
Autores: Dourado-Neto,Durval; Jong van Lier,Quirijn de; Metselaar,Klaas; Reichardt,Klaus; Nielsen,Donald R.
The original Thornthwaite and Mather method, proposed in 1955 to calculate a climatic monthly cyclic soil water balance, is frequently used as an iterative procedure due to its low input requirements and coherent estimates of water balance components. Using long term data sets to establish a characteristic water balance of a location, the initial soil water storage is generally assumed to be at field capacity at the end of the last month of the wet season, unless the climate is (semi-) arid when the soil water storage is lower than the soil water holding capacity. To close the water balance, several iterations might be necessary, which can be troublesome in many situations. For (semi-) arid climates with one dry season, Mendonça derived in 1958 an equation...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Actual and reference evapotranspiration; Deficit and excess water.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000100013

Genetic relationships and expected responses for genetic improvement of carcass traits of Berkshire pigs
Provedor de dados: 63
Autores: Tomiyama,Masamitsu; Kanetani,Takeshi; Tatsukawa,Yuuko; Mori,Hisashi; Oikawa,Takuro.
The Berkshire pig (Sus domestica L.) breed has thin muscle fibers and excellent water-holding capacity. The Berkshire meat makes it widely accepted in the Japanese premium pork market. This study evaluates the accuracy of improving carcass quality with the use of live animal records of Berkshire pigs. Traits analyzed in live animals were: body weight at 60 days of age (W60), age at finish (AGF), daily weight gain from birth to finish (DG), back fat thickness at finish (BFTF), and loin eye area at finish (LEAF), and in carcasses were: carcass weight, loin eye area (LEA), and subcutaneous fat thickness (SCF) at some points, using the records of 4,773 purebred Berkshire pigs. Variance components for the traits were estimated according to the animal model by...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Correlated response; Pig breeds; Meat productivity trait; Ultrasound equipment.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000500013

Características de latossolos roxos desenvolvidos de rochas alcalinas e básicas de Jaboticabal, SP
Provedor de dados: 63
Autores: Centurion,J.F.; Andrioli,L.; Marques Jr.,J.; Marchiori,D. G.
Comparou-se as características químicas, físicas e mineralógicas de Latossolos Roxos desenvolvidos de rocha alcalina (LRe) e de rocha eruptiva básica (LRd), da região de Jaboticabal, SP. Os resultados indicaram que o LRe apresenta-se num estádio de desenvolvimento, comparativamente, menos evoluído que o LRd, enquanto esse se apresenta com tendência para a maturidade. Os menores teores de argila e ferro total e maiores teores de saturação por bases, Ki e CTC da fração argila apresentados pelo LRe comprovam esta tendência. Conclui-se que a ocorrência de Latossolo Roxo eutrófico no campus da UNESP-Jaboticabal, pode estar associada a participação de rochas alcalinas na sua pedogênese.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Latossolo roxo; Rocha alcalina; Pedogênese.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000200004

Water quality and head loss in irrigation filters
Provedor de dados: 63
Autores: Ribeiro,Túlio Assunção Pires; Paterniani,José Euclides Stipp; Airold,Rogério Pereira da Silva; Silva,Marcelo Jacomini Moreira da.
Among the irrigation systems used today, trickle irrigation is one of the most efficient methods. This research, conducted by means of field tests, had the objective of comparing head loss evolution on water filtration with a disc filter (130 mum) and a non-woven synthetic fabric filter used in a drip irrigation system. The test consisted of fertirrigation with organic fertilizer, and chemical treatment of the water with sodium hypochlorite. Physical, chemical, and biological parameters were analyzed, such as: pH, turbidity, suspended solids, dissolved solids, EC, hardness, Langelier index, total iron, manganese, sulfides, algae, and bacteria. The water source used in this experiment was from an open reservoir, where an experimental trickle irrigation...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Drip irrigation; Filtration; Chlorine; Non-woven synthetic fabric; Fertilizers.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000600001

Fotossíntese, condutância estomática e transpiração em pupunheira sob deficiência hídrica
Provedor de dados: 63
Autores: Oliveira,Maria Aparecida José de; Bovi,Marilene Leão Alves; Machado,Eduardo Caruso; Gomes,Mara Menezes de Assis; Habermann,Gustavo; Rodrigues,João Domingos.
Resultados de pesquisa envolvendo aspectos fisiológicos da pupunheira (Bactris gasipaes Kunth), fruteira nativa da América Tropical, são escassos. Procurando completar essa lacuna, um experimento sob deficiência hídrica foi conduzido em casa de vegetação, durante um período de 13 dias, utilizando plantas de 12 meses de idade. O objetivo principal foi avaliar as respostas da pupunheira à deficiência hídrica. As variáveis observadas foram: taxa de assimilação de CO2, transpiração, condutância estomática e potencial de água das folhas. As coletas dos dados foram realizadas diariamente em laboratório e sob fluxo de 1200 mim-2 s-1. Os resultados foram submetidos à análise de variância e de regressão. Verificou-se decréscimo no potencial de água da folha e nas...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bactris gasipaes; Deficiência hídrica; Fotossíntese.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000100008

Bioensaio rápido de determinação da sensibilidade da acetolactato sintase (ALS) a herbicidas inibidores
Provedor de dados: 63
Autores: Monqueiro,Patrícia Andrea; Christoffoleti,Pedro Jacob.
Foi avaliada a atividade da acetolactato sintase (ALS), em plantas resistentes e suscetíveis de B. pilosa e A. quitensis após a aplicação de herbicidas inibidores da ALS. O método baseia-se na utilização do ácido ciclopropanodicarboxílico (CPCA) para inibir a cetoácido reductoisomerase (KARI), enzima que catalisa a reação seguinte do acetolactato na cadeia de biossíntese dos aminoácidos valina, leucina e isoleucina, provocando assim, o acúmulo de acetolactato, que na presença de um ácido forte forma acetoína. A base para a distinção entre os biotipos resistentes e suscetíveis é a quantidade de acetoína formada, que será maior nos biotipos em que a enzima ALS não sofreu inibição, ou seja, nos biotipos resistentes. A quantificação da acetoína acumulada...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Herbicida; Resistência; Acetolactato sintase; Bioensaio.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000100029

Bonferroni's and Sidak's modified tests
Provedor de dados: 63
Autores: Conagin,Armando; Barbin,Décio.
Results of practical importance had been discarded testing formulated hypothesis with the aid of statistical analysis of experimental data because of the power of the utilized test. This study compares the power of two Bonferroni's Modified and one Sidak's Modified tests with known tests analyzing 1200 simulated experiments. All differences of means were obtained in relation to the mean of the adopted control to guarantee parametrical magnitude of mean differences. Student's test (type I comparisonwise error) and Waller-Duncan's (Bayesian error) showed the highest percentage of significative differences, followed by Duncan's, BM2, SiM, BM1, DunnettU's, SiN, BN, Dunnettu's, SNK's, REGWF's, REGWQ's, Tukey's, Sidak's and Bonferroni's tests. For differences...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Statistical tests; Efficiency of tests; Multiples comparisons.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000100011

Optimization of sustaining swimming speed of matrinxã Brycon amazonicus: performance and adaptive aspects
Provedor de dados: 63
Autores: Arbeláez-Rojas,Gustavo; Moraes,Gilberto.
Deleterious changes in metabolism, growth performance and body composition may be observed if fish are constrained to swimming continuously or intermittently at over-speeds. This study evaluates effects of four water speeds on growth, body composition and hematologic profile of juvenile matrinxã, Brycon amazonicus. Fish (33.3 ± 0.9 g and 13.44 ± 0.1 cm) were held for 90 days in five water speeds (0.0 - control, 1.0, 1.5, 2.0 and 2.5 body lengths per second - BLAt swimming speeds ranging on 1.0 and 1.5 BL s–1, in fish growth was 20% higher. Hemoglobin and red blood cells at 1.5 BL s–1 increased 24% and 18% respectively; hematocrit was 17% higher in all exercised fish; protein content of white muscle at 1.0 BL s–1 was 2% higher; lipid deposition in red...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Body composition; Exercise; Fish growth; Hematology; Sustained swimming.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000300001

Herança de coloração de bulbos em cebola (Allium cepa L.) com resistência a Colletotrichum gloeosporioides
Provedor de dados: 63
Autores: Cardoso,A.I.I.; Della Vecchia,P.T.; Faria,L.P.
O objetivo deste trabalho foi determinar a herança de coloração de bulbos de cebola a partir do cruzamento de bulbos brancos com resistência a Colletotrichum gloeosporioides (Mal de 7 voltas) segregantes da população Roxa do Barreiro com bulbos amarelos de linhagens endogâmicas obtidas das variedades Super Precoce e Pira Ouro. Para tal obtiveram-se as gerações F1 e F2 entre (Super Precoce x Barreiro "Branca") e entre (Pira Ouro x Barreiro "Branca"). Nas gerações F1 obtiveram-se apenas bulbos roxos, enquanto que nas gerações F2 obtiveram-se uma segregação para bulbos roxos, brancos e amarelos numa proporção aproximada de 9:4:3, o que permitiu concluir que a herança, para estes cruzamentos, foi devida a 2 pares de genes contrastantes nas populações...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cebola (Allium cepa); Coloração de bulbos; Mal de 7-voltas.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000200029

Influence of photoperiod and air temperature on the growth, flowering and maturation of soybean (Glycine max (L.) Merrill)
Provedor de dados: 63
Autores: Câmara,G.M.S.; Sediyama,T.; Dourado-Neto,D.; Bernardes,M.S.
With the purpose to evaluate the effect of short (12 hours) and long (13 and 14 hours) photoperiods and air temperature regimes (winter and summer growing seasons) on soybean behaviour, greenhouse experiments were installed at the Federal University of Viçosa, Brasil, from June 1984 to December 1985. In each experiment, under a completely randomized design with 12 treatments (soybean cultivars) and eight replicates: duration of vegetative period from emergency to stage R1 or flowering (DVP, in days); plant height (PH, m); number of nodes per plant at stage R1 (NNP); and duration of soybean cycle from emergency to stage R7 or physiological maturity point (DC, days), were evaluated. The results permit to conclude that: the vegetative period from emergency to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phenology; Plant height; Photoperiodism.
Ano: 1997
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161997000300017

Interactions of adjuvants on adhesion and germination of Isaria fumosorosea on adults of Diaphorina citri
Provedor de dados: 63
Autores: Arnosti,André; Delalibera Junior,Italo; Conceschi,Marcos Roberto; D’Alessandro,Celeste Paola; Travaglini,Raphael Vacchi; Camargo-Mathias,Maria Izabel.
ABSTRACT: Asian citrus psyllid, Diaphorina citri, is considered the most important citrus pest worldwide, as it transmits Huanglongbing – serious citrus disease. New efficient and sustainable strategies to control this pest have been investigated and the use of entomopathogenic fungi has become a promising alternative. The objective of this study was to evaluate the effects of adjuvants a) Tween 80 at 0.01 % (v/v); b) Silwet L77 at 0.025 % (v/v) and c) KBRAdj at 0.075 % (v/v) on adhesion, germination and pathogenicity of Isaria fumosorosea ESALQ-1296(5 × 106 conidia mL–1). Female adults of D. citri used in this experiment were sprayed on Citrus limonia seedlings. The sprayed insects were analyzed through scanning electron microscopy (SEM) to identify the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biological control; Asian citrus psyllid; Entomopathogenic fungi; Formulation; Integument.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162019001600487

Material flow determination through agricultural machinery management
Provedor de dados: 63
Autores: Romanelli,Thiago Libório; Milan,Marcos.
The approach of material embodiment in agricultural production systems is important because it determines the convergence of inputs (indirectly, the natural resources) to the field. Additionally, material flow is the basis for both environmental (energy analysis, emergy synthesis, life-cycle analysis and carbon inventories) and economical analyses. Since different materials cannot compose a single index, generally these flows are not shown, making comparisons among approaches difficult. Another aspect that makes comparisons difficult is the definition of the boundary of the studied system. If these boundaries differ, results will also be different, hiding actual distinctions among systems. The present study aims to suggest an arrangement of existing models...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: LCA; Material embodiment; Environmental management; Mechanization.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000400001

Shading and periods of acclimatization of micropropagated banana plantlets cv. Grande Naine
Provedor de dados: 63
Autores: Scaranari,Ciro; Leal,Paulo Ademar Martins; Mazzafera,Paulo.
Banana plantlets obtained by micropropagation need to be submitted to a period of acclimatization since they do not use light, water, and nutrients in an efficient way. The acclimatization must be carried out under greenhouse conditions where temperature, light, and air humidity are adequate for a gradual hardening of the plantlets. In this study, the development of banana plantlets was evaluated during acclimatization under a full light condition including covered surfaces with red shade cloth (70%, 50%, and 30% shade) and black shade cloth (50% shade), both under a transparent plastic film of 100 µm. Temperature, relative air humidity, irrigation, and nutrition conditions were also controlled. Physical and physiological parameters were recorded at...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Musa sp.; Greenhouse shading; Greenhouse climate; Ranking.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000300008

Efeito da aplicação de efluente da fábrica de celulose junto com fosfogesso na correção da acidez do solo
Provedor de dados: 63
Autores: Kinjo,T.; Silveira,R.I.; Marcos,Z.Z.; Abrahão,I.O.
Foram coletados vários efluentes alcalinos da fábrica de celulose a fim de estudar a utilização destes junto com fosfogesso na correção da acidez do solo. Avaliou-se o poder de neutralização dos efluentes e a lixiviação de sódio na presença de fosfogesso numa coluna de terra. A aplicação do efluente eleva o pH do solo e o volume de efluente necessário para atingir pH 6,5 depende da sua composição química e o poder tampão de acidez do solo. A lixiviação de sódio é maior quando o fosfogesso é incorporado ao solo. A combinação do efluente com o fosfogesso corrige a acidez do solo, aumenta o teor de cálcio e, ao mesmo tempo, reduz o acúmulo de sódio no solo.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Acidez do solo; Efluente alcalino; Lixivia negra.
Ano: 1992
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161992000400017

Nitrogen fertilizer split-application for corn in no-till succession to black oats
Provedor de dados: 63
Autores: Ceretta,Carlos Alberto; Basso,Claudir José; Diekow,Jeferson; Aita,Celso; Pavinato,Paulo Sérgio; Vieira,Frederico Costa Beber; Vendrusculo,Edson Rodrigo Oliveira.
The studies of fertilization splitting are necessary specially for the grass succession black oat-corn where N immobilization is very common. Four experiments were carried out in commercial farms under no-tillage, in four counties - Itaara, Santo Ângelo, Júlio de Castilhos and Tupanciretã, all of Rio Grande do Sul, Brazil, with the objective of evaluating the splitting of N application in a corn/black oat crop rotation, during the 97/98 and 98/99 cropping seasons. The N was applied at three times -- pre-planted, starter and sidedressed. The pre-planted applied N for corn, corresponding to total or partial rates that would be sidedressed presented similar results in relation to the sidedress application, however, years of above average rainfall presented N...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cultural successions; Mineral nitrogen; Fertilization.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000300021

Nota do editor
Provedor de dados: 63
Autores: Reichardt,Klaus.
Tipo: Info:eu-repo/semantics/other
Ano: 1992
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161992000400001

Purified cellulose, soybean hulls and citrus pulp as a source of fiber for weaned piglets
Provedor de dados: 63
Autores: Pascoal,Leonardo Augusto Fonseca; Thomaz,Maria Cristina; Watanabe,Pedro Henrique; Ruiz,Urbano dos Santos; Amorim,Alessandro Borges; Daniel,Everton; Silva,Susana Zaneti da.
Dietary fiber is an important component, which has a direct effect on intake, digestion, and absorption of nutrients; and also alters intestinal microbiota and morphology according to solubility. One digestibility trial and one performance experiment were performed to evaluate the effects of sources of fiber in diets for 21 day weaned piglets. The experimental diets used in both trials consisted of a control diet and diets with purified cellulose, soybean hulls or citrus pulp as a main source of dietary fiber. To evaluate the digestibility of nutrients (Assay 1), the total feces and urine collection method was used. The fiber sources did not affect nutrient digestibility, except for soluble fiber, which increased with the inclusion of citrus (Citrus...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dietary fiber; Intestinal health; Short-chain fatty acids; Weaning; Villus.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162015000500400

Ratio and rate effects of 32P-triple superphosphate and phosphate rock mixtures on corn growth
Provedor de dados: 63
Autores: Franzini,Vinícius Ide; Muraoka,Takashi; Mendes,Fernanda Latanze.
The availability of phosphorus (P) from " Patos de Minas" phosphate rock (PR) can be improved if it is applied mixed with a water-soluble P source. The objective of this study was to evaluate 32P as a tracer to quantify the effect of the ratio of mixtures of triple superphosphate (TSP) with PR and the rates of application on P availability from PR. Two experiments were conducted in a greenhouse utilizing corn (Zea mays L.) plants as test crop. In the first experiment, the P sources were applied at the rate of 90 mg P kg-1 soil either separately or as compacted mixtures in several TSP:PR ratios (100:0, 80:20, 60:40, 50:50, 40:60, 20:80 and 0:100 calculated on the basis of the total P content). In the second experiment, the TSP was applied alone or as 50:50...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Typic Haplustox; Relative agronomic effectiveness; Phosphorus recovery; Radioisotope.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000100010

Study on vinasse dynamics in soil usin energy dispersive X-ray fluorescence with radioisotopic excitation
Provedor de dados: 63
Autores: Simabuco,S.M.; Nascimento Filho,V.F.
The distribution of S, Cl, K and Ca along the profiles of two soils of different texture (Red Yellow Podzolic and Dark Red Latosol) treated with amounts of vinasse equivalent to 4000 m³/ha were studied using energy dispersive X-ray fluorescence, observing a significant increase in the contents of these elements. The same effect was observed for Cu, Zn, Rb and Sr contents in soils treated with vinasse as compared to the control. The concentrations of Al, Si, Ti, Mn, Fe and Zr could also be evaluated but no significant variation was observed due to the high soil initial concentrations of these elements as compared to the low concentrations in the vinasse. Annular radioactive sources of Fe-55 and Cd-109 were employed for the excitation of these elements in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: X-ray fluorescence; Energy dispersive; Radioisotopic excitation; Vinasse.
Ano: 1994
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000200002

Quantidade absorvida e concentrações de micronutrientes em tomateiro sob cultivo protegido
Provedor de dados: 63
Autores: Rodrigues,Domingos Sávio; Pontes,Adriana Luzia; Minami,Keigo; Dias,Carlos Tadeu dos Santos.
A produção sob cultivo protegido é uma prática relativamente recente no Brasil e a área com tomate nesse ambiente vem crescendo a cada ano, e junto com esse crescimento, cresce também a falta de informações técnicas apropriadas para as nossa condições. Este trabalho avaliou a quantidade absorvida e os teores de micronutrientes pelo tomateiro em ambiente protegido. Foram utilizados diferentes fertilizantes, via solo, foliar e fertirrigação, foi utilizada a cultivar Lúcia, o experimento foi instalado em Piracicaba-SP, no período de dez/95 a março/96. O delineamento utilizado foi o aleatorizados em blocos, com três tratamentos e seis repetições. Em média, a planta apresentou na época do florescimento (35 dias após transplante) a seguinte concentração em mg...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lycopersicon esculentum; Fertirrigação; Nutrição; Hortaliça.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000100020

Wheat cultivar tolerance to boron deficiency and toxicity in nutrient solution
Provedor de dados: 63
Autores: Furlani,Ângela Maria Cangiani; Carvalho,Cristiane Pierrotte; Freitas,José Guilherme de; Verdial,Marcelo Fontanetti.
Field symptoms of open spikelets in wheat were observed in specific cultivars and supposedly related to low B soils and differential B requirement among cultivars. This study aimed to evaluate the response of four wheat (Triticum aestivum L.) cultivars, IAC 24, IAC 60, IAC 287 and IAC 289, to increasing B concentrations in nutrient solution. The experiment was set up in a randomized complete block design, with four replicates and five B concentrations (0.0, 0.05, 0.2, 0.8 and 2.0 mg L-1), during 1997/1998, in a greenhouse. Plants were grown to maturity and evaluated for plant height, spike number and length, open spikelet number, grains per spike, plant parts dry matter, B, P, K, Ca and Mg leaf concentrations and total nutrient contents. The visual...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Triticum aestivum L.; Boron nutrition; Leaf B concentrations; Critical limits.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000200022

Propriedades químicas de um Latossolo Amarelo cultivado com pastagens na Amazônia Oriental
Provedor de dados: 63
Autores: Pereira,Walcilene Lacerda Matos; Veloso,Carlos Alberto Costa; Gama,José Raimundo Natividade Ferreira.
A pesquisa foi conduzida com o objetivo de avaliar as modificações das propriedades químicas de um Latossolo Amarelo com cultivo de pastagens, submetidos a dois modelos de sistemas rotacionados, nos períodos chuvoso e seco, um com Brachiaria brizantha e o outro com Panicum maximum, nos anos de 1996 e 1997. O delineamento experimental utilizado foi em blocos casualizados, com os tratamentos dispostos num esquema de parcelas subdivididas, com doze repetições. As parcelas foram constituídas pelas forrageiras braquiarão e tobiatã e as subparcelas foram constituídas pelos períodos chuvoso e seco dentro de cada ano. Para o estudo das propriedades químicas do solo, foram coletadas amostras nos períodos chuvoso e seco. O material orgânico incorporado ao solo...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sistema de pastejo; Braquiarão; Tobiatã; Fertilidade do solo.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000300025

Digestion and energy value of macerated sudangrass hay used in growing-finishing diets for feedlot cattle
Provedor de dados: 63
Autores: Jorquera,Alejandro Plascencia; Ponce,José Gerardo Serrano; Sánchez-Mendoza,Berenice; Serrano,Alberto Barreras; Calderón-Cortés,José Fernando; López-Soto,María Alejandra; Montaño Gómez,Martín Francisco; Zinn,Richard Avery.
Mechanical maceration enhances site and extent of digestion of low-moisture, low-quality forages. Four Holstein steers (172 ± 8 kg) with cannulas in rumen and proximal duodenum were used in 4x4 Latin square design to evaluate the process of mechanical maceration of sudangrass hay on the characteristics of ruminal and total tract digestion. Treatments consisted of a steam-flaked corn-based growing diet supplemented with 21 % forage (DM basis) as: i) wheat straw (Triticum aestivum, STRW), ii) sudangrass hay (Sorghum sudanense, SG), iii) macerated SG at intensity of 4,134 kPa (MAC600) and 4) macerated SG at intensity of 6,200 kPa (MAC900). All forages were ground to pass through a 3.8 cm screen before incorporation into complete mixed diets (21:79 forage to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sorghum sudanense; Feed value; Maceration; Steers; Forages.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000600001

Fenitrothion and esfenvalerate stability during corn and wheat sample processing
Provedor de dados: 63
Autores: Vásquez-Castro,Javier Alberto; Baptista,Gilberto Casadei de; Trevizan,Luiz Roberto Pimentel; Gadanha Junior,Casimiro Dias.
The presence of insecticide residues in cereals represents a risk for the consumer, because these substances are used in large scale to protect stored grains from the attack of pests. The effects of three processing methods for corn and wheat samples on the stability of stored-grain protective insecticides were here evaluated. Fenitrothion and esfenvalerate were applied so as to produce theoretical concentrations of 10 and 0.5 mg kg-1, respectively. Two hours after treatment, the grains were processed and deposition was analyzed by gas chromatography. Grain species did not influence insecticide stability. This stability was only dependent upon the processing method and insecticide type. Grains processed together with dry ice provided the greatest...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Stored grain; Insecticide degradation; Dry ice; Gas chromatography.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000200008

Quality reference values for rare earth elements in soils from one of the last agricultural frontiers in Brazil
Provedor de dados: 63
Autores: Silva,Yuri Jacques Agra Bezerra da; Oliveira,Eliabe Barros de; Silva,Ygor Jacques Agra Bezerra da; Nascimento,Clístenes Williams Araújo do; Silva,Tatiana dos Santos; Boechat,Cácio Luiz; Teixeira,Marcos Paulo Rodrigues; Barbosa,Ronny Sobreira; Singh,Vijay P.; Sena,Antonny Francisco Sampaio de.
ABSTRACT: Environmental impacts caused by the addition of rare earth elements (REEs) to agricultural soils are a growing concern. The sedimentary basin of the Gurguéia River is located in one of the last agricultural frontiers in Brazil; nevertheless, data regarding quality reference values (QRVs) for REEs in soils are still scarce. The objective of this study was therefore to determine the natural concentration and establish the QRVs of REEs in soils of Gurguéia watershed, Brazil. Fifty-five composite soil samples were collected at sites under no or minimal anthropic interference. The average REE natural concentrations in soils from the Gurguéia watershed were lower than those found in other regions of Brazil and worldwide, following the order (mg kg−1):...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: REE geochemistry; Gurguéia watershed; Oxisols; Lanthanides.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000701401

Proteolysis of prato type cheese produced using ultrafiltration
Provedor de dados: 63
Autores: Spadoti,Leila Maria; Dornellas,José Raimundo Ferreira; Roig,Salvador Massaguer.
The application of milk ultrafiltration technology for cheese manufacture presents several advantages. However, it also influences proteolysis and, consequently, cheese ripening. The effects of five different processing methods for Prato cheese were evaluated with respect to the time evolution of the extent and depth of proteolysis indexes (EPI and DPI). The following treatments (T) for cheese production were studied: T1 - without ultrafiltration (standard); T2, T3, T4 and T5 - using milk concentrated by ultrafiltration (UFCM) and respectively: T2 - without pre-fermentation of the UFCM; T3 - pre-fermentation of 10% of the UFCM; T4 - pre-fermentation of 20% of the UFCM, and T5 - pre-fermentation of 20% of the UFCM plus indirect heating. Treatments affected...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Milk; Membrane technology; Ripening.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000300006

Viabilidade econômica do cultivo de shiitake em diferentes escalas de produção
Provedor de dados: 63
Autores: Paula,Débora Pires; Tarsitano,Maria Aparecida Anselmo; Graciolli,Luiz Antônio.
O interesse nacional pelo cultivo comercial de shiitake é crescente, devido às suas propriedades nutricionais e medicinais, e ao seu apreciável sabor. O cultivo deste cogumelo constitui uma alternativa rentável de diversificação das atividades de uma propriedade agrícola. Este trabalho teve como objetivo determinar, no Estado de São Paulo, a viabilidade econômica do cultivo de shiitake considerando-se um ciclo de 14 meses, em 1000, 2000, 3000 e 4000 toros de eucalipto. As escalas de produção de 2000 e 4000 toras apresentaram os menores custos de produção kg-1 de shiitake fresco, cerca de R$6,50 e os melhores índices de lucratividade, aproximadamente 34%. A análise de viabilidade econômica mostrou resultados favoráveis para as três maiores escalas de...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Lentinula edodes; Cogumelo; Shiitake; Viabilidade econômica.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000200031

Gluconeogenic supplements do not affect production, reproductive traits and blood metabolite of holstein cows during the transition period
Provedor de dados: 63
Autores: Oliveira,Paulo Garcez de; Pires,Alexandre Vaz; Meyer,Paula Marques; Susin,Ivanete; Villarreta,Elias Tunon; Rodrigues,Paulo Henrique Mazza; Santos,Flávio Augusto Portella.
The use of gluconeogenic supplements for dairy cows during the transition period has produced contradictory responses in the literature, making it difficult to recommend them. The objective of this trial was to evaluate supplementation with propylene glycol (PG), calcium propionate (CP), and "Dairy Power Drench®" (DR) on the transitional period of Holstein cows. Parameters studied were variation of body condition score (BCS), body weight (BW), milk production (MP), reproductive efficiency and nonesterified fatty acid concentration (NEFA). One hundred and sixty five animals from two commercial herds were used. Treatments consisted of: C- Control; DR- administration of "Dairy Power Drench®" (3 applications) during postpartum; CP- daily administration of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Propylene glycol; Calcium propionate; Dairy power drench; Holstein cow; Reproductive efficiency.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000400005

Qualidade de grãos de café beneficiados em resposta à adubação potássica
Provedor de dados: 63
Autores: Silva,Enilson de Barros; Nogueira,Francisco Dias; Guimarães,Paulo Tácito Gontijo.
O clima e o solo tem elevada influência na qualidade dos grãos de café (Coffea arabica L.) beneficiado. Foram instalados dois experimentos sobre latossolo (Latossolo Vermelho distroférrico e Latossolo Vermelho-Amarelo distrófico) com o objetivo de verificar a qualidade dos grãos de café beneficiados submetidos à adubação potássica em duas condições edafoclimáticas. Em ambos os locais, os experimentos foram delineados em blocos casualizados, em esquema de parcelas subdivididas, utilizando-se três fontes de K: cloreto de potássio (KCl), sulfato de potássio (K2SO4) e nitrato de potássio (KNO3) nas parcelas e quatro doses de K (0, 100, 200 e 400 kg ha-1) aplicadas nas subparcelas com quatro repetições. Usou-se nos experimentos o cultivar Catuaí Vermelho no...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Doses; Polifenoloxidase; Índice de coloração; Açúcares totais.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000100025

Degradabilidade do capim-elefante em diferentes estágios de maturidade avaliada pelo método in vitro/gás
Provedor de dados: 63
Autores: Campos,Fábio Prudêncio de; Lanna,Dante Pazzanese Duarte; Bose,Max Lázaro Vieira; Boin,Celso; Sarmento,Patrícia.
O capim-elefante (Pennisetum purpureum Schum.) é uma gramínea tropical de elevada capacidade de acumulação de matéria seca, mas seu valor nutritivo é acentuadamente influenciado pela maturidade. Considerando a natureza intrínseca da parede celular nas diferentes partes da planta, o conhecimento de suas taxas e extensões de degradação permite a determinação de qual componente e qual estágio de maturidade que afeta sua digestão. Portanto, o objetivo deste trabalho foi avaliar a degradabilidade da matéria seca (MS) do capim-elefante cv. Napier, pelo método in vitro/gás, com cortes de 45 a 105 dias a intervalos de 10 dias entre os cortes. Notou-se decréscimo na degradabilidade das frações do capim-elefante com o avanço do estágio de maturidade. Os coeficientes...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: FDN; Folhas; Forragem; Hastes; Matéria seca.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000200003

Sugarcane straw and the populations of pests and nematodes
Provedor de dados: 63
Autores: Dinardo-Miranda,Leila Luci; Fracasso,Juliano Vilela.
The green cane harvesting represented a significant change in sugarcane ecosystem due to the presence of straw left on the soil and to the absence of fire. These two factors may affect the populations of pests and their natural enemies. Among the pests benefit from the green cane harvesting stand out the spittlebug, Mahanarva fimbriolata, the curculionid Sphenophorus levis and sugarcane borer, Diatraea saccharalis. In areas of green cane harvesting, the population of these species grew faster than in areas of burnt cane. On the other hand, there are virtually no records of attacks by lesser cornstalk borers in areas of green cane harvesting. Populations of plant parasitic nematodes and the beetles Migdolus fryanus, very important pests of sugarcane, were...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Saccharum spp.; Diatraea saccharalis; Sphenophorus levis; Manhanarva fimbriolata; Migdolus fryanus.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162013000500012

Monitoring the sardine (Sardinella brasiliensis) fermentation process to obtain anchovies
Provedor de dados: 63
Autores: Oetterer,Marília; Perujo,Sérgio Daniel; Gallo,Cláudio Rosa; Arruda,Lia Ferraz de; Borghesi,Ricardo; Cruz,Ana Maria Paschoal da.
Anchovies are traditional fish preserves, prepared from fermented fish of the engraulidae family, mainly in European countries. In Brazil, sardines (Sardinella brasiliensis) are an alternative fish for preparing these types of preserves, provided that the preservation process results in a high quality product. In this research, sardines were prepared for preservation and physicochemical, microbiological and sensory analyses were carried out during the preservation process. Whole or eviscerated sardines, with or without condiments/preservatives and with 20% of salt (w/w) were used. Sardines were analyzed fresh, and at 1, 15, 30, 45 and 60 days along the preservation process. The use of whole sardines, with or without condiments/preservatives, presented best...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Seafood; Fermented fish; Cured process.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000300015

Ácido giberélico, bissulfureto de carbono e ácido 2-4 cloroetil fosfônico e a dormência e produtividade de tubérculos de batata
Provedor de dados: 63
Autores: Ayub,Ricardo Antonio; Furiatti,Rui Scaramella; Pereira,André Belmont; Reghin,Marie Y.; Banzatto,David Ariovaldo; Oliveira,Alessandra Valéria de.
Com o objetivo de avaliar a eficiência do ácido giberélico, bissulfureto de carbono e ácido 2-4 cloroetil-fosfônico (EthrellR) na quebra de dormência e na produção de batata, cv. "Marijke", foi conduzido um ensaio no período de 1990/ 91 em Piraí do Sul, PR . A superioridade do tratamento com o ácido 2-4-cloroetil-fosfônico em relação ao ácido giberélico e ao bissulfureto de carbono, aliada a sua facilidade de aplicação, justifica a sua recomendação com vistas a quebra de dormência de tubérculos do genótipo de batata em estudo, para a região de Piraí do Sul, PR, onde a dose de 842 mg.L-1 de EthrellR ocasionou a produção máxima de 23395 kg/ha.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Solanum tuberosum; Batata; Regulador vegetal; Fisiologia vegetal.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000500001

EFEITOS DE DIFERENTES TÉCNICAS DE DESPENDOAMENTO NA PRODUÇÃO DE MILHO
Provedor de dados: 63
Autores: Magalhães,Paulo César; Durães,Frederico Ozanan Machado; Oliveira,Antonio Carlos de; Gama,Elto Eugenio Gomes e.
Com o objetivo de verificar os efeitos de diferentes tipos de despendoamento no desenvolvimento de plantas e produção de sementes de milho, foi conduzido, um ensaio durante três anos agrícolas. Esse trabalho consistiu de cinco tipos de despendoamento (manual, macho-estéril, arranquio do cartucho, mecânico e testemunha) e três genótipos (linhagens A e B e o híbrido CMS 355), em suas versões férteis e estéreis. Esses tratamentos foram combinados num fatorial 5x3 com quatro repetições, num delineamento experimental de blocos ao acaso. As variáveis avaliadas, após a imposição dos tratamentos foram: altura da planta, área foliar e peso da matéria seca total. Na colheita, foram avaliados: altura de inserção de espiga, índice de espiga e produção de sementes. Os...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Relação fonte/dreno; Particionamento; Pendão; Despendoamento; Zea mays L.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000100012

Que hipóteses estatísticas testamos através do SAS em presença de caselas vazias?
Provedor de dados: 63
Autores: Iemma,A.F.
A interpretação das hipóteses testadas através da análise de variância de dados agropecuários balanceados pode ser feita, em geral, sem grandes problemas, mormente para experimentos bem planejados e bem conduzidos. Se, no entanto, os dados são desbalanceados e apresentam caselas vazias, então a interpretação das hipóteses testadas através das somas de quadrados fornecidas pelos pacotes estatísticos disponíveis pode ser extremamente difícil para os estatísticos e praticamente impossível para os profissionais das ciências aplicadas, usuários de pacotes estatísticos. Neste estudo, discute-se a interpretação das hipóteses mais comumente testadas através do procedimento GLM (General Linear Models) do sistema SAS (Statistical Analysis System), visando alertar os...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hipóteses estatísticas; Caselas vazias; SAS/GLM.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000200002

Visual soil structure quality assessment on Oxisols under no-tillage system
Provedor de dados: 63
Autores: Giarola,Neyde Fabíola Balarezo; Silva,Alvaro Pires da; Tormena,Cássio Antônio; Ball,Bruce; Rosa,Jadir Aparecido.
Methods for evaluation the soil structure quality based on field evaluations are useful to determine strategies for soil management, with the advantage of requirement the use of little equipment and the possibility of immediate interpretation. A new methodology was recently developed to temperate soils for this purpose, called Visual Soil Structure Assessment (Ball et al., 2007). It was tested the hypothesis that it is possible to apply and advance in the interpretation of the results from use of Visual Soils Structure Assessment in cultivated Oxisols. Therefore the goal of this study was to apply, evaluate and enhance the potential of the methodology developed by Ball et al. (2007) in two Oxisols under long-term, no-till in Parana State, Brazil, as well...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Soil physical quality; Soil morphological analysis; Soil conservation management.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000400016

Germinação de sementes de Panicum maximum Jacq. pré-tratadas com ácido sulfúrico
Provedor de dados: 63
Autores: Toledo,F.F. De; Chamma,H.M.C.P.; Novembre,A.D.L.C.
O presente trabalho foi realizado com o objetivo de avaliar o efeito da aplicação do pré-tratamento com ácido sulfúrico sobre a germinação de sementes de Panicum maximum Jacq., em condições de laboratório. Sementes recém colhidas dos capins Colonião, Tobiatã, Centenário, Centauro e Tanzânia 1, não tratadas e pré-tratadas (escarificadas), foram submetidas a ensaios de germinação, a partir de agosto de 1991 até abril de 1993, em intervalos de aproximadamente 4 meses entre cada época. Os dados colhidos, após análise estatística, permitiram elaborar a seguinte conclusão: o pré-tratamento com ácido sulfúrico não contribuiu para melhorar a porcentagem de germinação das sementes testadas, desde o início até o final do período de armazenagem.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sementes de Panicum maximum; Pré-tratamento com ácido sulfúrico; Germinação.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000100005

Spatial variability of soil phosphorus of a low productivity Brachiaria brizantha pasture
Provedor de dados: 63
Autores: Corazza,Edemar Joaquim; Brossard,Michel; MuraokaI,Takashi; Coelho Filho,Maurício Antonio.
Studies on soil phosphorus (P) of low productivity cultivated pastures in Cerrado (Brazilian Savanna) areas and surveys on other possible problems related to P are scarce. The spatial variability of soil phosphorus content of a Rhodic Ferralsol was studied in a low productivity pasture of Brachiaria brizantha (BB) grown for 10 years, without fertilizer application, in an experimental area at Planaltina (GO), Brazil. Soil samplings were performed on a regular grid of 10 by 10 meters, with 98 sampling points before (between tussocks and under tussocks) and after the establishment of the experiment (after fertilizing). On the same grid, forage plants were collected and separated into fractions for N and P content analyses. Soil available phosphate was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Resin-extractable P; Fertilization; Tussock; Isotopic exchange kinetics; Phosphate.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000300022

Common bean resistance expression to whitefly in winter and rainy seasons in Brazil
Provedor de dados: 63
Autores: Silva,Anderson Gonçalves da; Boiça Junior,Arlindo Leal; Farias,Paulo Roberto da Silva; Souza,Bruno Henrique Sardinha de; Rodrigues,Nara Elisa Lobato; Carbonell,Sérgio Augusto Morais.
ABSTRACT: Whitefly Bemisia tabaci (Gennadius) biotype B is the major pest of common bean (Phaseolus vulgaris L.) in Brazil and other countries. Host plant resistance is one of the cornerstones of Integrated Pest Management (IPM), and assessment of cultivars for insect resistance is fundamental to provide farmers options for pest control. This study evaluated common bean resistance to whitefly in the winter and rainy seasons in Jaboticabal, Brazil, and correlated the infestation with climatic factors. The plant part and development period of common bean that are more susceptible to whitefly infestation were also examined for potential use in IPM. Field experiments were carried out using 18 and 19 commercial cultivars in the winter and rainy seasons,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phaseolus vulgaris; Bemisia tabaci; Aleyrodidae; Host plant resistance; Integrated pest management.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162019001500389

Biometric characteristics and canopy reflectance association for early-stage sugarcane biomass prediction
Provedor de dados: 63
Autores: Rocha,Murillo Grespan da; Barros,Flávio Margarito Martins de; Oliveira,Stanley Robson de Medeiros; Amaral,Lucas Rios do.
ABSTRACT: Knowing the spatial variability of sugarcane biomass in the early stages of development may help growers in their management decision-making. Proximal canopy sensing is a promising technology that can identify this variability but is limited to quantifying plant-specific parameters. In this study, we evaluated whether biometric variables integrated with canopy reflectance data can assist in the generation of models for early-stage sugarcane biomass prediction. To substantiate this assertion, four sugarcane-producing fields were measured with an active crop canopy sensor and 30 sampling plots were selected for manually quantifying chlorophyll content, plant height, stalk number and aboveground biomass. We determined that Random Forest and Multiple...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Random forest; Canopy sensor; Vegetation indices; Precision farming; Data mining.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162019001400274

Data visualization in yield component analysis: an expert study
Provedor de dados: 63
Autores: Wnuk,Agnieszka; Gozdowski,Dariusz; Górny,Andrzej; Wyszyński,Zdzisław; Kozak,Marcin.
ABSTRACT Even though data visualization is a common analytical tool in numerous disciplines, it has rarely been used in agricultural sciences, particularly in agronomy. In this paper, we discuss a study on employing data visualization to analyze a multiplicative model. This model is often used by agronomists, for example in the so-called yield component analysis. The multiplicative model in agronomy is normally analyzed by statistical or related methods. In practice, unfortunately, usefulness of these methods is limited since they help to answer only a few questions, not allowing for a complex view of the phenomena studied. We believe that data visualization could be used for such complex analysis and presentation of the multiplicative model. To that end,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Multiplicative model; Complex trait; Graphical methods.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162017000200118

Putative metabolic pathway of mannitol and sorbitol and in sugarcane
Provedor de dados: 63
Autores: Marino,Celso Luís; Leite,Susi Meire Maximino; Farro,Ana Paula Cazerta; Sassaki,Flávio Tetsuo; Campos,Henrique Luis Veronezi de; Coscrato,Virgínia Elias.
Until the mid 1950s, boron was believed to play an important role in the transport of sugars in plants. However, boron actually depends on sugar alcohols to be taken up by the plant. In some cases, the main sugars involved in this process are sorbitol and mannitol which form stable complexes with boron. In this study, the sequences of the SugarCane EST Genome Project (SUCEST) database were searched for enzymes involved in the metabolism of these sugars by comparing them with enzymes from other organisms. Eighteen contigs from sugarcane (Saccharum sp.) presented high similarity with 11 enzymes involved in the putative biosynthetic pathway of sorbitol and mannitol from fructose in sugarcane. Seven of these contigs had high homology with sequences deposited...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Boron; Expressed sequence tags (ESTs); Polyols; Sugar alcohol.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000400017

ACÚMULO DE CÁDMIO POR Saccharomyces cerevisiae EM CALDO DE CANA-DE-AÇÚCAR CONTAMINADO COM ACETATO DE CÁDMIO
Provedor de dados: 63
Autores: Mariano-da-Silva,Samuel; Prado-Filho,Luíz Gonzaga do.
O presente trabalho visou estudar o acúmulo de cádmio (Cd) por Saccharomyces cerevisiae, fermentando mosto de caldo de cana-de-açúcar com contaminações controladas, em níveis sub-tóxicos do citado metal. As condições de fermentação foram similares às reinantes na produção industrial de etanol. O mosto, não esterelizado, continha 12% de açúcares redutores totais (ART) e pH 4,5. Para a contaminação controlada empregou-se acetato de cádmio em quatro níveis de contaminações (0,5; 1,0; 2,0 e 5,0 mg Cd kg-1 mosto). A inoculação do mosto foi executada com fermento de panificação (10% p/p). Após a fermentação (4 horas) foram determinados, porcentagem de fermento no vinho centrifugado e teor alcoólico do mesmo. Na levedura separada foram determinados peso úmido,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Saccharomyces cerevisiae; Caldo de cana; Metal pesado; Cádmio.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000200021

Lime application methods, water and bottom soil acidity in fresh water fish ponds
Provedor de dados: 63
Autores: Queiroz,Julio Ferraz de; Nicolella,Gilberto; Wood,Charles Wesley; Boyd,Claude Elson.
Although some methods for determining lime requirement of pond soils are available and commonly used, there is still no consensus on whether it is more effective to apply liming materials to the bottoms of empty ponds or to wait and apply them over the water surface after ponds are filled. There is also little information on how deep lime reacts in pond sediment over time, and whether the depth of reaction is different when liming materials are applied to the water or to the soil. Therefore, three techniques for treating fish ponds with agricultural limestone were evaluated in ponds with clayey soils at a commercial fish farm. Amounts of agricultural limestone equal to the lime requirement of bottom soils were applied to each of three ponds by: direct...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Liming; Total alkalinity; Total hardness; Sediments.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000500001

Nitrate reductase activity in leaves and stems of tanner grass (Brachiaria radicans Napper)
Provedor de dados: 63
Autores: Cazetta,Jairo Osvaldo; Villela,Luciana Cristine Vasques.
Tanner grass (Brachiaria radicans Napper) is a forage plant that is adapted to well-drained soils or wetlands, and responds well to nitrogen (N) fertilization. The assimilation of N involves the nitrate reductase (NR) enzyme, and its activity seems to be dependent on N supply. Molybdenum (Mo) is also important because it is a cofactor of NR. In this study, the variables of an in vivo assay were optimized for measuring nitrate reductase activity (NRA) in the leaves and stem tissues. This method was used to evaluate NO3- metabolism in plants fertilized with NaNO3, NH4Cl or urea, in association with or without application of H2MoO4, aiming to provide guidelines for N management of this species. The best conditions to determine NRA involved the incubation of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brachiaria arrecta; Nitrogen; Molybdenum; Enzyme.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000600012

Genetic variability in natural populations of Zeyheria montana mart. from the Brazilian Cerrado
Provedor de dados: 63
Autores: Bertoni,Bianca Waléria; Astolfi Filho,Spartaco; Martins,Ernani Ronie; Damião Filho,Carlos Ferreira; França,Suzelei de Castro; Pereira,Ana Maria Soares; Telles,Mariana Pires de Campos; Diniz Filho,José Alexandre F.
Zeyheria montana, an endemic species of the Bignoniaceae family from the Brazilian Cerrado's known for its anti-cancer properties, is widely used as imuno stimulant in the popular medicine and its therapeutic activity must be validated by scientific data. The objective of this work was to evaluate the genetic variability of eight plant populations collected within the state of São Paulo, Brazil, via Random Amplification of Polymorphic DNA (RAPD) used as molecular markers. After an optimized protocol for the amplification reaction, nine selected primers generated 105 reproducible bands, indicating up to 60% polymorphism. Analysis of molecular variance (AMOVA) revealed higher genetic variation within populations (84.03%) than among populations (15.97%). The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bignoniaceae; Germplasm bank; Bolsa-de-pastor; Conservation.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000400012

Improving predictions of leaf appearance in field grown potato
Provedor de dados: 63
Autores: Streck,Nereu Augusto; Lago,Isabel; Paula,Fabiana Luiza Matielo de; Bisognin,Dilson Antônio; Heldwein,Arno Bernardo.
The calculation of leaf appearance rate (LAR) and number of accumulated or emerged leaves (NL) on the main stem are part of many crop simulation models. The purpose of this study was to adapt and evaluate a model (WE model) for simulating the main stem LAR and NL in potato (Solanum tuberosum L.). The WE model is a non-linear multiplicative model that takes into account the effect of genotype and environmental factors on LAR. A linear model (Phyllochron model) was also used as a comparison with the WE model. A series of field experiments with 14 planting dates over two years (2003 and 2004) was carried out in Santa Maria, RS, Brazil, using the cultivar Asterix. Coefficients of the WE model and the phyllochron model were estimated with data from four...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Modeling; Temperature; Leaf development; Phyllochron.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000100002

Compressibility and water availability in Albaqualf soils under different deployment times in no-tillage
Provedor de dados: 63
Autores: Reis,Diony Alves; Lima,Cláudia Liane Rodrigues de; Bamberg,Adilson Luís; Ribeiro,Pablo Lacerda.
ABSTRACT: The southern Brazilian lowlands have been historically used for flooded rice cultivation. Over time, heavy machinery and intensive tillage practices have resulted in soil structure disruption, soil compaction, higher production costs and lower agricultural profitability. This study aimed to evaluate the effect of different deployment times of no-tillage (NT). Soil properties including bulk density (BD), compression index (CI), preconsolidation pressure (σp), bulk density at preconsolidation pressure (BDσp), degree of compactness (DC), soil water retention curve (SWRC), plant available water (PAW) and total organic carbon (TOC) content were evaluated using a 30-yr non-cultivated field (NC), adjacent to the experimental plots as a control. The BD,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lowlands; Preconsolidation pressure; Degree of compactness; Organic carbon.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162018000500393

Avaliação do método de triagem para análise de milho contaminado com aflatoxinas pela fluorescência amarelo-esverdeada brilhante (BGYF- Bright Greenish Yellow Fluorescence)
Provedor de dados: 63
Autores: PALOMINO,M.E.T.; FONSECA,H.; GLÓRIA,E.M.; CALORI-DOMINGUES,M.A.; MARQUES,C.
A técnica da fluorescência amarelo-esverdeada brilhante (BGYF) como método de triagem na avaliação de milho eventualmente contaminado com aflatoxina, utilizada por uma indústria alimentícia do Estado de São Paulo em 61 amostras de milho, foi comparada com a técnica BGYF padronizada, aplicada em laboratório antes e após trituração dos grãos e, também, com a técnica da cromatografia em camada delgada (CCD). Os resultados da indústria geraram menor número de resultados falso-positivos do que a técnica BGYF padronizada. Por outro lado, apenas os resultados da indústria apresentaram amostras falso-negativas, ao contrário da BGYF padronizada, que não as apresentou. Conclui-se que existe uma inadequação do número de pontos fluorescentes adotados como critério de...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aflatoxina; Milho; Fluorescência BGY; Triagem.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000300020

Adsortividade do herbicida "Zeta" em solos de variadas texturas
Provedor de dados: 63
Autores: Moreira,A.; Siqueira,S. C. de; Silva,A.A. da.
Com o objetivo de estimar a dose do herbicida "Zeta" que inibe 50% I50) do crescimento de plantas bioindicadoras em solos com diferentes texturas e teores de matéria orgânica, podendo estes ter uma influência marcante sobre a bioatividade do herbicida testado, utilizou-se o delineamento experimental inteiramente casualizado com 7 tratamentos (0, 50, 100, 150, 200, 250 e 300 g i.a./ha) e 4 repetições, sendo os tratamentos dispostos em 5 tipos de texturas de solo. Os parâmetros avaliados foram: biomassa fresca total, biomassa seca da parte aérea e biomassa seca do sistema radicular das plantas de sorgo. De acordo com os resultados obtidos pode-se concluir que em solos com textura tendendo à arenosa o herbicida apresenta uma grande mobilidade vertical, e que...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Alumínio; Argila; Bioatividade; Biomassa fresca; Biomassa seca; Matéria orgânica.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000300015

Análise química do pecíolo e limbo foliar como indicadora do estado nutricional dos mamoeiros 'solo' e 'formosa'
Provedor de dados: 63
Autores: Marinho,Cláudia Sales; Monnerat,Pedro Henrique; Carvalho,Almy Jr. Cordeiro de; Marins,Sérgio Lúcio David; Vieira,Alcílio.
A ausência de um consenso na literatura sobre qual parte da folha, limbo ou pecíolo, seria a mais indicada para avaliação do estado nutricional do mamoeiro, dificulta o uso da análise foliar como ferramenta de diagnose para a cultura. Assim, foi conduzido um experimento para comparar a diagnose do estado nutricional efetuada pela análise do limbo e do pecíolo foliar de mamoeiros pertencentes aos grupos 'Solo' e 'Formosa'. Foi adotado o delineamento em blocos casualizados para avaliar seis variedades de mamoeiros, três de cada grupo. Foram retiradas amostras foliares em cinco épocas, a cada três meses. A folha recém-madura foi dividida em limbo e pecíolo, onde foram determinados os teores de N, NO3-, P, K, Ca, Mg, S, B, Cl, Fe, Mn e Zn. Estes teores foram...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Carica papaya; Variedade; Análise foliar; Macro e micronutrientes.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000200025

Productive and vegetative behavior of olive cultivars in super high-density olive grove
Provedor de dados: 63
Autores: Proietti,Primo; Nasini,Luigi; Reale,Lara; Caruso,Tiziano; Ferranti,Francesco.
In recent years, there has been an increase in interest in super high-density (SHD) olive (Olea europaea L.) groves because they offer early entry into production, increased productivity and the possibility of using modified mechanical vine harvesters. This study was carried out in a young SHD olive grove to examine vegetative, histo-anatomical and productive characteristics and oil quality of the Spanish Arbequina and Italian Maurino and Leccino cultivars, characterized by low, low-to-medium and high vigor, respectively. Arbequina had low vigor and limited development in height and width, as well as a high leaf/wood ratio. Maurino had a canopy volume similar to that of Arbequina and, despite a great tendency to grow in height, had low vigor, a rather...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Canopy architecture; Leaf anatomy; Leaf area index; Oil quality.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162015000100020

Estimation of genetic parameters for weight traits and Kleiber Index in a Brahman cattle population
Provedor de dados: 63
Autores: Manuel,Matos; Cavani,Ligia; Millen,Danilo Domingues; Andrighetto,Cristiana; Lupatini,Gelci Carlos; Fonseca,Ricardo da.
ABSTRACT: Interest in improving feed efficiency of cattle has been increasing. The residual feed intake (RFI), the most commonly used measurement of feed efficiency, is expensive and can only be used in a small number of animals. The Kleiber Index has also been proposed to measure RFI. In this study, we estimated genetic parameters for the Kleiber Index average daily weight gain and adjusted weights to obtain a more comprehensive understanding of potential responses to selection and support the development of breeding strategies. Genetic analyses were conducted on animal records from a data file with 36,505 animals recorded by ABCZ (Brazilian Association of Zebu Breeders). Restricted maximum likelihood estimates of genetic parameters were computed with...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Genetic correlation; Average daily gain; Heritability; Standard age weight.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162019001600459

Cor de feijão vagem fresco e processado após aplicação de cálcio
Provedor de dados: 63
Autores: Fávaro,Simone Palma; Sá,Marcela Colognesi de; Ida,Elza Iouko; Braga Neto,José Antônio.
A cor em vegetais é um dos principais atributos de qualidade observado pelo consumidor e é influenciada por características intrínsecas e de processamento. O objetivo desta investigação foi avaliar as alterações de cor de feijão vagem fresco e processado após aplicação de concentrações crescentes de cálcio via absorção radicular. O feijão vagem cultivar UEL 1 foi cultivado com aplicação de concentrações crescentes de cálcio via solução nutritiva contendo 0, 75 , 150 e 300 mL L-1 de cálcio em substrato de areia grossa. A cor das vagens ao natural e enlatadas foram avaliadas por colorimetria de três estímulos, e os resultados foram expressos no sistema Hunter. As vagens ao natural apresentaram-se mais claras e amarelas quando foi adicionado cálcio à solução...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Phaseolus vulgaris; Feijão-vagem; Cor; Cálcio.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000300030

Traceability of peaches from integrated production in South Brazil
Provedor de dados: 63
Autores: Tibola,Casiane Salete; Fachinello,José Carlos; Rombaldi,Cesar Valmor; Nora,Leonardo; Rufato,Andrea de Rossi; Rufato,Leo.
Traceability is becoming the most effective method to provide a safer food chain and connection producers to consumers. This paper report the application and validation of a traceability system on the production chain of peaches, according the rules for Integrated Production of Peach (IP) and a Hazard Analysis and Critical Control Point (HACCP) systems. The harvesting plots were discriminated using a Global Positioning System (GPS) device. The horticultural practices were registered in a field book according to the Brazilian IP rules. Boxes to transport the fruit, from the orchard on, were barcode labelled to identify the fruits in terms of origin (orchard and harvesting plot), cultivar, quality, picking date and time. Arriving in the factory, by an...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Traceability; Quality; Food safety.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000100002

Elaboração de fiambres com as carnes branca e escura de frango
Provedor de dados: 63
Autores: Graner,M.
O presente trabalho teve como objetivo específico a obtenção de fiambres com as carnes branca (do peito) e escura (das coxas e pernas) de frango, separadamente. Os cortes foram desossados manualmente e às carnes, após limpeza e corte, foram adicionados ingredientes não cárneos e aditivos, sendo elas moídas após 12 h. O processamento térmico foi realizado em defumador até a temperatura interna de 71°C. Foram obtidos fiambres curados e defumados com boa qualidade sensorial, adequado nível de proteína e baixo conteúdo calórico, do tipo semi-conserva. O rendimento foi maior na elaboração do fiambre de carne branca, o qual foi preferido na avaliação sensorial, em relação ao produto de carne escura.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Carne de frango; Fiambre.
Ano: 1992
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161992000400023

Vadose zone measurement and modeling
Provedor de dados: 63
Autores: Hopmans,J. W.; Clausnitzer,V.; Kosugi,K.I.; Nielsen,D.R.; Somma,F.
The following treatise is a summary of some of the ongoing research activities in the soil physics program at the University of California in Davis. Each of the four listed areas win be presented at the Workshop on special topics on soil physics and crop modeling in Piracicaba at the University of Sao Paulo. We limited ourselves to a general overview of each area, but will present a more thorough discussion with examples at the Workshop.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Unsaturated zone; Water flow; Transport processes; Modeling.
Ano: 1997
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161997000300004

Arraste via fecal de nutrientes da ingestão produzido por bagaço de mandioca hidrolisado
Provedor de dados: 63
Autores: Raupp,Dorivaldo da Silva; Marques,Silvia Helena de Paula; Rosa,Danielle Amorim; Caldi,Carla Marielle; Cremasco,Ana Candida Vivan; Banzatto,David Ariovaldo.
A ingestão de fibras alimentares pode resultar em arraste de outros nutrientes para as fezes. Bagaço de mandioca produzido por polvilheira foi submetido à hidrólise enzimática para obtenção de um produto mais concentrado em fibra alimentar insolúvel denominado de bagaço de mandioca hidrolisado (BMH). O BMH foi avaliado em ensaios biológicos com ratos Wistar quanto a sua habilidade de arrastar os nutrientes da ingestão para as fezes, tendo como padrão de fibra o farelo de trigo (FT). Acréscimo à dieta base, substituindo igual quantidade de amido, de dose de 5%, 15% ou 25% de BMH promoveu arraste significativo de minerais (globalidade) ou proteína; dose de 15% ou 25% promoveu arraste significativo de lipídeo; e, dose de 25% promoveu arraste significativo de...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mandioca; Fibra alimentar/dietária; Farelo de trigo; Nutrição; Alimento funcional.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000200005

Alterações eletroquímicas de um Latossolo Vermelho-Amarelo tratado com carbonato e sulfato de cálcio
Provedor de dados: 63
Autores: Wadt,Paulo Guilherme S.
Amostras de um Latossolo Vermelho-Amarelo, argiloso, coletadas do horizonte A e Bw de solo sob floresta e pastagem foram utilizadas no estudo da movimentação de cátion. As amostras dos solos A-floresta e A-pastagem foram tratadas com carbonato de cálcio, sulfato de cálcio ou com a mistura destas fontes de cálcio, com o propósito de avaliar seus efeitos sobre as principais reações eletroquímicas do solo, principalmente em relação à adição de sulfato. A seguir, as amostras foram colocadas em potes sobre as amostras Bw. Após a incubação, foram lixiviadas com sete volume-poros de água destilada, em aplicações semanais. Terminado o período de lixiviação, procedeu-se à análise de cálcio, magnésio, potássio, e alumínio trocáveis, pH em água, pH em KCl 1 mol L-1,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Adsorção; Ponto de carga zero; Efeito salino; Gesso agrícola.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000300023

Nitrogen fertilizer leaching in an Oxisol cultivated with sugarcane
Provedor de dados: 63
Autores: Ghiberto,Pablo Javier; Libardi,Paulo Leonel; Brito,Alexsandro dos Santos; Trivelin,Paulo Cezar Ocheuze.
Nitrogen (N) leaching below the crop-rooting zone represents not only a valuable loss of nutrients for the plant, but also a potential pollution source of groundwater. The objective of this work was to quantify leaching losses of native N and that derived from fertilizer in an Oxisol that was cultivated with sugarcane (Saccharum officinarum) during the crop plant cycle. The sugarcane was planted and fertilized with urea in the planting furrow, with 120 kg ha-1 of N. In order to determine the fate of the fertilizer - N, four microplots with 15N enriched fertilizer were installed. Input and output of N at the depth of 0.9 m were quantified from the flux density of water and the N concentration in soil solution. During the evaluation period the rainfall was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Saccharum spp; Sustainability; Solute transport; Environmental quality; Pollution.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000100013

Índice baseado em RFLPs para seleção de linhagens visando sintéticos de milho
Provedor de dados: 63
Autores: Rumin,Glauce Cristina Ricardo; Vencovsky,Roland.
Marcadores moleculares têm sido sugeridos como ferramentas úteis em programas de melhoramento de plantas. Assim, este trabalho teve como objetivo propor um índice de seleção de linhagens visando a geração de populações sintéticas de milho, baseado em marcadores moleculares e dados de campo. Para tanto foram utilizados valores fenotípicos e genotípicos, oriundos de experimentos convencionais de campo e através da genotipagem das plantas-mãe das linhagens por marcadores RFLP, respectivamente. O índice foi examinado quanto à sua capacidade de originar sintéticos com alta freqüência de alelos favoráveis, em comparação com os obtidos baseando-se na seleção convencional. Utilizaram-se inicialmente 157 locos marcadores com distância média de 15,30 cM entre eles....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays; Marcadores RFLP; Linhagem endogâmica; Índice de seleção; Sintéticos.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000200013

Determination of aspartate kinase activity in maize tissues
Provedor de dados: 63
Autores: Ferreira,Renato Rodrigues; Vendemiatti,Ariane; Gratão,Priscila Lupino; Lea,Peter John; Azevedo,Ricardo Antunes.
Lysine, threonine, methionine and isoleucine are synthesized from aspartate in a branched pathway in higher plants. Aspartate kinase plays a key role in the control of the aspartate pathway. The enzyme is very sensitive to manipulation and storage and the hydroxamate assay normally used to determine aspartate kinase activity has to be altered according to the plant species and tissue to be analyzed. We have optimized the assay for the determination of aspartate kinase in maize plants callus cell cultures. Among all the assay parameters tested, the concentration of ATP/Mg and temperature were critical for enzyme activity. In the case of temperature, 35°C was shown to be the optimum temperature for aspartate kinase activity.
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Aspartate pathway; Maize; Lysine; Threonine; Methionine.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000200015

Suitability of peanut residue as a nitrogen source for a rye cover crop
Provedor de dados: 63
Autores: Balkcom,Kipling Shane; Wood,Charles Wesley; Adams,James Fredrick; Meso,Bernard.
Leguminous winter cover crops have been utilized in conservation systems to partially meet nitrogen (N) requirements of succeeding summer cash crops, but the potential of summer legumes to reduce N requirements of a winter annual grass, used as a cover crop, has not been extensively examined. This study assessed the N contribution of peanut (Arachis hypogaea L.) residues to a subsequent rye (Secale cereale L.) cover crop grown in a conservation system on a Dothan sandy loam (fine-loamy, kaolinitic, thermic Plinthic Kandiudults) at Headland, AL USA during the 2003-2005 growing seasons. Treatments were arranged in a split plot design, with main plots of peanut residue retained or removed from the soil surface, and subplots as N application rates (0, 34, 67...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: N immobilization; N mineralization; Legume; Nitrogen fertilizer.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000200012

Sampling equipament for soil bulk density determination tested in a Kandiudalfic Eutrudox and a Typic Hapludox
Provedor de dados: 63
Autores: Folegatti,Marcos Vinícius; Brasil,René Porfirio Camponez do; Blanco,Flávio Favaro.
In spatial variability studies of soil physical properties the influence of different samplers on the results is seldomly taken into account. The objective of this work was to evaluate the performance of five different types of sampling equipment for soil bulk density determination, in two different soils a Kandiudalfic Eutrudox and a Typic Hapludox, both of Piracicaba, SP, Brazil. Equipment used for soil undisturbed sampling were: (i) Uhland soil sampler; (ii) Kopecky's Ring; (iii) soil core sampler, model "Soil Moisture"; (iv) soil core sampler Bravifer AI-50 and (v) soil core sampler Bravifer AI-100. The sampling was made in 4 grids of 1m², each with 25 sampling points, with five replications, resulting 100 samples for each soil. It was concluded that...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Soil sampling; Soil pososity; Soil physical properties.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000400027

Biological Control in Brazil: an overview
Provedor de dados: 63
Autores: Parra,José Roberto Postali.
The use of Biological Control methods is on the increase, mainly as a result of the mobilization of human resources in entomology studies since the establishment of graduate programs in this country in the 1960s. This review approaches the retrospective of Biological Control in Brazil in recent decades, with an emphasis on the "culture of applying agrochemicals" adopted by Brazilian growers, which constrains progress in this area. Successful cases of Biological Control have been reported on in Brazil and there are, in fact, excellent programs in place that use insects or entomopathogenic microrganisms for insect pest control. Most of the studies in this area have been published in Portuguese and are, therefore, not readily available internationally....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Tropical agriculture; Entomology; Integrated pest management; Sustainable agriculture.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162014000500012

Plasticizer types and whey protein coatings on internal quality and shelf life of eggs stored for 42 days
Provedor de dados: 63
Autores: Pires,Paula Gabriela da Silva; Franceschi,Carolina Haubert; Bavaresco,Caroline; Leuven,Aline Fernanda Rodrigues; Andretta,Ines.
ABSTRACT: Effects of plasticizer types and whey protein concentrate (WPC) as coatings were evaluated on internal quality and shelf life of eggs stored for 42 days. Eggs were coated with WPC at 8 % solution combined with the plasticizers glycerol (GLY), sorbitol (SOR), and propylene glycol (PRO). The eggs were stored at 20 °C. Weight loss, Haugh Unit (HU), albumen and yolk pH, and yolk index (YI) were evaluated weekly from day 0 to 42 days. After, electron microscopy of the eggshell structure was performed. The data was submitted to the analysis of variance and the effects of treatment, storage time, and the interaction between these factors were evaluated. There was significant interaction between factors (treatment and periods) for weight loss (p &lt;...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Egg quality; Glycerol; Propylene glycol; Sorbitol.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000700901

Yield, quality and drought sensitivity of tomato to water deficit during different growth stages
Provedor de dados: 63
Autores: Cui,Jintao; Shao,Guangcheng; Lu,Jia; Keabetswe,Larona; Hoogenboom,Gerrit.
ABSTRACT In areas where the supply of water for irrigation is limited, tomato production is often subject to drought stress. In order to investigate the drought sensitivity of tomato (Lycopersicon esculentum Mill.) yield and quality during different growth stages, field and pot experiments were conducted in a high tunnel in southern China during the 2013 and 2016 growing seasons. The experiments consisted of four treatments. Crops were drip-irrigated to 100 % of field capacity at all growth stages divided into treatment T1 (control) and the treatment group T2, T3 and T4 receiving half the amount of irrigation as T1 when the soil water content reached 70 % of field capacity, the vegetative phase (stage I) T2, the flowering and fruit development phase (stage...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Deficit irrigation; Sensitivity index; Irrigation management; High tunnel.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000200601

Identification of the Er1 resistence gene and RNase S-alleles in Malus prunifolia var. ringo rootstock
Provedor de dados: 63
Autores: Agapito-Tenfen,Sarah Zanon; Dantas,Adriana Cibele de Mesquita; Denardi,Frederico; Nodari,Rubens Onofre.
Woolly apple aphid (WAA; Eriosoma lanigerum Hausm.) is a major insect pest that has significant economic impact on apple growers worldwide. Modern breeding technologies rely on several molecular tools to help breeders select genetic determinants for traits of interest. Consequently, there is a need for specific markers linked to the genes of interest. Apple scions and rootstocks have an additional barrier to the introduction of pest resistance genes due to the presence of self-incompatibility S-RNase alleles. The genetic characterization and early identification of these alleles can amplify the contribution of a breeding program to the selection of resistant genitors that are as compatible as possible. In this study, we identified the Er1 gene involved in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Malus pumila; Woolly apple aphid; Self-incompatibility; Bulk segregant analysis; Marker-assisted selection.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162015000100062

Inheritance of resistance to Fusarium oxysporum f. sp. phaseoli Brazilian race 2 in common bean
Provedor de dados: 63
Autores: Pereira,Mônica Juliani Zavaglia; Ramalho,Magno Antonio Patto; Abreu,Ângela de Fátima Barbosa.
Aiming to obtain information concerning the genetic control of the resistance of the bean (Phaseolus vulgaris L.) to the fungus Fusarium oxysporum f. sp. phaseoli, six crosses involving three resistant lines (Carioca MG, Esal 583 and Esal 566) and four susceptible to the fungus (Carioca, CNFC 10443, Uirapuru and Esal 522) were developed. The parental lines, the controls (Carioca MG and Carioca) and the F1, F2 and F3 generations were evaluated for reaction to Fusarium. For inoculation, root cuttings were immersed in a spore suspension. The evaluations were performed at 21 days after inoculation, by scale of notes ranging from 1.0, to 9.0 and genetic and phenotypic parameters were estimated. The heritability in the narrow sense ranged from 0.34 to 0.42 and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phaseolus vulgaris; Fusarium wild; Disease resistance.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000600010

Physicochemical, microbiological and sensory assessments of Italian salami sausages with probiotic potential
Provedor de dados: 63
Autores: Ruiz,Juliana Nogueira; Villanueva,Nilda D. Montes; Favaro-Trindade,Carmen Silvia; Contreras-Castillo,Carmen J.
Probiotics are live microorganisms that confer a health benefit on the host by improving the intestinal microbial balance. We evaluated the viability of Lactobacillus acidophilus (La) and Bifidobacterium lactis (Bl) probiotics and their effects on the technology and sensorial characteristics of fermented sausage. The presence of probiotic cultures reduced water activity and promoted faster pH reduction in the salamis, which presented pH values between 4.71 and 5.23 and water activity between 0.84 and 0.89. Lactic acid content ranged between 0.19 and 0.29 g, and the samples lost up to 35 % of their weight during ripening. As regards color, no differences were found between the probiotic salamis and the control, presenting an overall mean of 40.85 for L*...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lactobacillus acidophilus; Bifidobacterium lactis; Fermented meat sausage; Functional food; Sensory acceptance.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162014000300005

Inseticidas sistêmicos aplicados via tronco para controle de Oncometopia facialis, Phyllocnistis citrella e Toxoptera citricida em citros
Provedor de dados: 63
Autores: Yamamoto,Pedro Takao; Roberto,Sérgio Ruffo; Pria Jr.,Wolney Dalla.
O controle biológico de insetos vetores de Phyllocnistis citrella em citros tem se mostrado ineficiente e o uso de inseticidas apresenta poucas opções. O objetivo do trabalho foi avaliar a eficiência de inseticidas sistêmicos, aplicados via tronco, no controle de Oncometopia facialis (Signoret) (Hemiptera: Cicadellidae), Phyllocnistis citrella Staiton (Lepidoptera: Gracillaridae) e Toxoptera citricida (Kirkaldy) (Hemiptera: Aphididae) em citros. A eficiência para O. facialis foi determinada pelo método de confinamento, utilizando-se 5 cigarrinhas adultas por repetição. Para P. citrella avaliou-se o número de folhas com lagartas em 3 ramos/planta e para T. citricida o número de ramos infestados. O acefate Pellet 970, vamidotion CE 300, monocrotofós CE 400,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Citrus sinensis; Cicadellidae; Gracillariidae; Aphididae; Controle químico.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000300007

Tiller emission and dry mass accumulation of wheat cultivars under stress
Provedor de dados: 63
Autores: Almeida,Milton Luiz de; Sangoi,Luís; Merotto Jr.,Aldo; Alves,Antônio Carlos; Nava,Itamar Cristiano; Knopp,Armando Cristiano.
Tillers are important structures for wheat (Triticum aestivum L.) because they contribute to increase the number of spikes per area, enhancing grain yield. Stresses during plants early growth have a sizable effect on tiller production. Three experiments were conducted to evaluate the effects of stresses induced by unevenness in sowing depth, defoliation and differences in soil pH on tiller emission and dry mass accumulation of wheat cultivars. The experiments were carried out in Lages, Southern Brazil, during the winter growing seasons of 2000 and 2001. They were performed in square boxes, under natural conditions of radiation and irrigation. In the first experiment, five types of sowing depths were tested to simulate different systems of unevenness in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Triticum aestivum L.; Tillering; Sowing depth; Defoliation; Aluminum.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000300004

Seed weight of Xylopia aromatica (Annonaceae): quality evaluation from X-ray and seedling emergence
Provedor de dados: 63
Autores: Socolowski,Fábio; Cicero,Silvio Moure; Vieira,Daniela Cristine Mascia.
Xylopia aromatica (Lam.) Mart. (Annonaceae) is a native species of the Brazilian Savannah (“Cerrado”) region, recommended for the recovery of degraded areas and also for medicinal use. Seeds of some species of the Annonaceae require a long period to germinate and many studies have focused on determining methods which can rapidly analyze seed quality. The objective of this study was to evaluate the quality of Xylopia aromatica (Lam.) Mart. seeds in accordance to their weight, through X-ray images and emergence test. Seeds were collected from dehiscent follicles with a blower and one portion was separated into weight categories: very light seeds, light seeds and heavy seeds. Another seed portion was separated in water by their density, into those that sank...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brazilian Savannah; Seed processing; Internal morphology; Forestry seed.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000600006

Dry matter intake, performance and carcass characteristics of hair sheep reared under different grazing systems
Provedor de dados: 63
Autores: Santos,Viviane Rodrigues Ventolin dos; McManus,Concepta; Peripolli,Vanessa; Tanure,Candice Bergmann; Lima,Paulo de Mello Tavares; Corrêa,Patrícia Spoto; Brito,Daiana Lima; Torres,Sônia Emília Figueiredo de Araújo; Louvandini,Helder.
ABSTRACT The aim of this study was to evaluate the effect of three different grazing systems: isolated, alternate and simultaneous, on feed intake, performance and carcass characteristics of sheep. About 5.2 ha area of Tanzania grass (Panicum maximun Jacq cultivate Tanzania) was divided into 13 paddocks. This area was used as a stocking rate of two animal units (AU) per ha for 7 days’ occupation and 21 days rest. A total number of 58 animals were used consisting of 12 heifers and 30 Santa Ines lambs with the addition of 16 adult ewes that were used to stabilize grazing pressure in the isolated system. The sheep were fed on 200 g per head per day of concentrate and cattle 2 kg per head per day. The parameters determined were the following: weekly weight...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Carcass quality; Carcass weight; Simultaneous grazing systems; Tanzania grazing area.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162017000600436

Physiological responses and production of 'Syrah' vines as a function of training systems
Provedor de dados: 63
Autores: Favero,Ana Carolina; Amorim,Daniel Angelucci de; Mota,Renata Vieira da; Souza,Claudia Rita de; Regina,Murillo de Albuquerque.
Plant architecture and its interaction with agricultural practices and environmental constraints is determinant for grapevine canopy structure, which is related to carbon assimilation, bud fertility and fruit quality. In this context, this study evaluated the performance of field-grown 'Syrah' grapevines conducted by two management systems: Vertical Shoot Position (VSP) or a modified Geneva Double Curtain (GDC), in Pirapora, state of Minas Gerais, Brazil, during the winters of 2007 and 2008. The evaluations of leaf area, water relations and net CO2 assimilation were made at the end of the ripening period. Yield per vine and per hectare were estimated and mean berry weight and diameter, total soluble solids, pH and titratable acidity were evaluated during...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: CO2 assimilation; Canopy management; Water potential; Berry temperature; Fruit quality.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000300003

Growth regulator losses from cotton plants due to rainfall
Provedor de dados: 63
Autores: Garcia,Rodrigo Arroyo; Toledo,Mariana Zampar; Rosolem,Ciro Antonio.
Plant growth regulators (PGRs) applied to cotton plants (Gossypium hirsutum L.) can be washed off by rainfall. It is expected that the closer the rainfall to spraying time, the higher the product loss and the higher the amount of product to be reapplied to reach the desired growth rate. The objective of this study was to evaluate the effects of time between rainfall and application of either mepiquat chloride or chlormequat chloride to cotton on plant growth, as well as, estimate the need for PGR reapplication. Cotton was grown in 12-L pots with soil in a greenhouse. PGRs were applied forty days after seedling emergence, when 50% of plants had one pinhead square. Rainfall was simulated 1, 2, 4, 6, or 24 h after spraying. Plant height was measured just...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gossypium hirsutum L.; Mepiquat chloride; Chlormequat chloride.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000200005

Morphological and molecular characterization of Puccinia kuehnii, the causal agent of sugarcane orange rust, in Cub
Provedor de dados: 63
Autores: Perera,María Francisca; Bertani,Romina Priscila; Arias,Marta Eugenia; Hechavarría,María de la Luz La O; Navarro,María de los Ángeles Zardón; Debes,Mario Alberto; Luque,Ana Catalina; Cuenya,María Inés; Rojas,Ricardo Acevedo; Castagnaro,Atilio Pedro.
ABSTRACT Sugarcane orange rust caused by Puccinia kuehnii has recently become an important disease in sugarcane crops and its spread is causing great concern to growers. In this study, we analyzed spores from symptomatic orange rust sugarcane leaves collected in multiple locations in Cuba in a 4-year-period in order to characterize morphological traits of P. kuehnii, establish an adequate molecular technique to characterize it, and determine its infection court in sugarcane. Orange rust caused by P. kuehnii was confirmed by polymerase chain reaction (PCR) and morphological characterization. AFLP markers detected high diversity in P. kuenhnii samples. Sequencing of rDNA regions, as expected, did not reveal differences and SSR markers designed for P....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: AFLP; RDNA; SSR; Infection courts.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000201200

Physiological and productive responses of environmental control on housed sows
Provedor de dados: 63
Autores: Romanini,Carlos Eduardo Bites; Tolon,Yamilia Barrios; Nääs,Irenilza de Alencar; Moura,Daniella Jorge de.
Swine housing must promote an adjusted environment for thermal comfort and high animal productivity without negatively affecting the sow performance and reproductive response. This study evaluated the use of distinct environmental cooling equipments on sow performance, both on the gestation and on nursing in open sided housing. Two treatments were tested in the gestation building: natural ventilation and mechanical ventilation associated to fogging; while in the nursing rooms three treatments were tested: natural ventilation; mechanical ventilation; and evaporative cooling with forced ventilation. Sows were randomly chosen from the same genetic lot form six combined treatments. The evaporative cooling system in the farrowing room differed for piglet...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gestating sows; Lactating sows; Thermal stress.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000400002

Water relations of field-grown grapevines in the São Francisco Valley, Brazil, under different rootstocks and irrigation strategies
Provedor de dados: 63
Autores: Souza,Claudia Rita de; Bassoi,Luís Henrique; Lima Filho,José Moacir Pinheiro; Silva,Fabrício Francisco Santos da; Viana,Leandro Hespanhol; Dantas,Barbara França; Pereira,Maiane Santos; Ribeiro,Paula Rose de Almeida.
There is an increased demand for high quality winegrapes in the São Francisco Valley, a new wine producing area in Brazil. As the grape quality is closely linked to the soil water status, understanding the effects of rootstock and irrigation management on grapevine water relations is essential to optimize yield and quality. This study was carried out to investigate the effects of irrigation strategies and rootstocks on water relations and scion vigour of field-grown grapevines in Petrolina, Pernambuco state, Brazil. The cultivars used as scions are Moscato Canelli and Syrah, both grafted onto IAC 572 and 1103 Paulsen rootstocks. The following water treatments were used: deficit irrigation, with holding water after veraison; and partial root-zone drying,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vitis vinifera L.; Partial rootzone drying; Deficit irrigation; Stomatal conductance.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000400002

Feeding site of the spittlebug Mahanarva fimbriolata (Stål) (Hemiptera: Cercopidae) on sugarcane
Provedor de dados: 63
Autores: Garcia,José Francisco; Grisoto,Eliane; Botelho,Paulo Sérgio Machado; Parra,José Roberto Postali; Appezzato-da-Glória,Beatriz.
The sugarcane spittlebug Mahanarva fimbriolata (Stål) (Hemiptera: Cercopidae) is a pest of mechanically-harvested sugarcane in Brazil, when trash burning is not performed. To better understand the differences in feeding behavior of adults and nymphs of this pest and the subsequent disorders that arise, stylet penetration through fixation, staining and sectioning was investigated. Nymphs cause a "physiological disorder" damaging the tracheary system of the roots, slowing or preventing water and nutrient flow, with phloem and xylem dehydration. Nymphs insert their stylets through the epidermis, crossing the cortex, endodermis and pericycle before reaching the vascular cylinder, where they feed in the sieve-tube elements of the primary phloem. In contrast,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anatomy; Insect-plant interaction; Salivary sheath; Vascular tissue.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000500014

Prediction of soil CO2 flux in sugarcane management systems using the Random Forest approach
Provedor de dados: 63
Autores: Tavares,Rose Luiza Moraes; Oliveira,Stanley Robson de Medeiros; Barros,Flávio Margarito Martins de; Farhate,Camila Viana Vieira; Souza,Zigomar Menezes de; Scala Junior,Newton La.
ABSTRACT: The Random Forest algorithm is a data mining technique used for classifying attributes in order of importance to explain the variation in an attribute-target, as soil CO2 flux. This study aimed to identify prediction of soil CO2 flux variables in management systems of sugarcane through the machine-learning algorithm called Random Forest. Two different management areas of sugarcane in the state of São Paulo, Brazil, were selected: burned and green. In each area, we assembled a sampling grid with 81 georeferenced points to assess soil CO2 flux through automated portable soil gas chamber with measuring spectroscopy in the infrared during the dry season of 2011 and the rainy season of 2012. In addition, we sampled the soil to evaluate physical,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Saccharum officinarum; Soil respiration; Green sugarcane; Clay.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162018000400281

Soil type spatial prediction from Random Forest: different training datasets, transferability, accuracy and uncertainty assessment
Provedor de dados: 63
Autores: Machado,Diego Fernandes Terra; Silva,Sérgio Henrique Godinho; Curi,Nilton; Menezes,Michele Duarte de.
ABSTRACT: Different uses of soil legacy data such as training dataset as well as the selection of soil environmental covariables could drive the accuracy of machine learning techniques. Thus, this study evaluated the ability of the Random Forest algorithm to predict soil classes from different training datasets and extrapolate such information to a similar area. The following training datasets were extracted from legacy data: a) point data composed of 53 soil samples; b) 30 m buffer around the soil samples, and soil map polygons excluding: c) 20 m; and d) 30 m from the boundaries of polygons. These four datasets were submitted to principal component analysis (PCA) to reduce multidimensionality. Each dataset derived a new one. Different combinations of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Digital soil mapping; Soil survey; Legacy data.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162019001300243

More adequate probability distributions to represent the saturated soil hydraulic conductivity
Provedor de dados: 63
Autores: Mesquita,Maria da Glória Bastos de Freitas; Moraes,Sérgio Oliveira; Corrente,José Eduardo.
The saturated soil hydraulic conductivity (Ksat) is one of the most relevant variables in studies of water and solute movement in the soil. Its determination in the laboratory and in the field yields high dispersion results, which could be an indication that this variable has a no symmetrical distribution. Adjustment of the normal, lognormal, gamma and beta distributions were examined in order to search for a probability were density function that would more adequately describe the distribution of this variable. The experiment consisted in determining the saturated hydraulic conductivity, through the constant head permeameter method, in undisturbed samples of three soils of different textures from the central western region of the São Paulo State, Brazil,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Water movement; Variability; Probability functions.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000400025

Contribution of organic amendments to soil properties and survival of Stenocarpella on maize stalk
Provedor de dados: 63
Autores: Faria,Mírian Rabelo de; Guimarães,Rafaela Araújo; Pinto,Felipe Augusto Moretti Ferreira; Siqueira,Carolina da Silva; Silva,Carlos Alberto; Medeiros,Flávio Henrique Vasconcelos de; Bettiol,Wagner.
ABSTRACT: The incorporation of organic matter to the soil not only improves nutrient content, but also reduces the survival of Stenocarpella, the causal agent of stalk rot, Diplodia ear rot, and grey leaf spot, in maize stubble. We evaluated the effect of organic waste incorporation on Stenocarpella survival in maize stalks, the activity of suppressiveness-related enzymes, and nutrient contents. We conducted the assays in the municipalities of Lavras and Sete Lagoas, Minas Gerais State, Brazil. Maize stalks infested with Stenocarpella were kept in field conditions for three months after poultry litter, swine manure, fish hydrolysate, compost sewage sludge, and urea application. Infested stalks, without residue amendment, were kept on surface or...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Stenocarpella maydis; Stenocarpella macrospora; Zea mays; Stalk rot; Organic matter.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000601201

Genetic structure analysis of Mauritia flexuosa natural population from the Lençóis Maranhenses region using microsatellite markers
Provedor de dados: 63
Autores: Castro,Domingos Augusto Mendonça; Costa,Tatiana Santos; Cardoso,Ariane Santos; Ramos,Helaine Christine Cancela; López,Jorge Alberto; Diniz,Leandro Eugenio Cardamone.
ABSTRACT Buriti (Mauritia flexuosa L.f), a palm tree native to South America and widely distributed in Brazil, displays significant ecological, economic and biotechnological importance. However, the disorderly extractivism and environmental degradation of its endemic areas are leading to reductions in, and/or extinction of the buriti palm tree, causing ecological imbalance with significant economic losses for rural communities and genetic diversity. Consequently, populational genetic diversity studies have become relevant as a strategy for conserving the species. Therefore, this study evaluated the genetic structure of 10 populations from the Lençóis Maranhenses region, in the state of Maranhão, Brazil, using microsatellite markers. Results indicated that...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Buriti; SSR; Preservation; Diversity; Variability.
Ano: 2022
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162022000101101

Long-term annual fertilization with nitrogen and potassium affect yield and mineral composition of 'Fuji' apple
Provedor de dados: 63
Autores: Nava,Gilberto; Dechen,Antonio Roque.
Nitrogen (N) and potassium (K) are closely related to orchard productivity, since they are usually found in higher concentrations than others macronutrients in apple (Malus × domestica Borkh) fruits. This research was carried out to assess the effect of eight years of soil additions of N and K on yield, fruit size and mineral composition of 'Fuji'/Marubakaido apple in São Joaquim, State of Santa Catarina, Southern Brazil. A factorial design was used with N and K annual fertilizer rates (0, 50, 100, 200 kg ha-1 of N and K2O) replicated in three orchards from 1998 to 2006. Yield was estimated by multiplying the total number of fruit per tree by the mean weight of 100 randomly sampled fruit. Fifteen days prior to harvest, 24 fruit pulps were analyzed for N,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Malus domestica Borkh; Fertilization; Production; Nutrition.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000300013

On simple methods for unsaturated soil hydraulic conductivity determination
Provedor de dados: 63
Autores: Bacchi,O.O.S.; Reichardt,K.
The simple methods of LIBARDI et al. (1980) and SISSON et al. (1980) for K(theta) estimation, although developed on completely different theoretical basis, are rigorously identical for the exponential hydraulic conductivity model. The unit gradient approximation used in these methods seems valid for practical purposes but is theoretically in valid.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil hydraulic conductivity; Unit gradient.
Ano: 1993
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161993000200022

Cover crops and pruning in Bobal and Tempranillo vineyards have little influence on grapevine nutrition
Provedor de dados: 63
Autores: Pérez-Bermúdez,Pedro; Olmo,Manuel; Gil,Jaime; García-Férriz,Lorenzo; Olmo,Carmen; Boluda,Rafael; Gavidia,Isabel.
ABSTRACT Cover crops may improve vineyard soil properties, grapevine nutrient status and berry composition, however, factors such as cover crop type, annual rainfall, climate and irrigation may change their effects on vineyards. From 2008 to 2011, the effects of a non-permanent cover crop and two pruning techniques on soil as well as vine nutrients and grapevine performance of two vineyards (cv. Tempranillo and cv. Bobal) were evaluated. For that purpose, two legumes were sown in inter-rows of hand-pruned vines in February and were tilled at flowering. Soil tillage, or cover cropping, was combined with either light pruning or severe pruning to study foliar nutrient variations. Soil N, P, K and total organic carbon (TOC) were determined in samples taken...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vitis vinifera; Foliar macronutrients; Legumes; Soil macronutrients.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000300260

Cover cropping system and mulching can shape soil microbial status in fruit orchards
Provedor de dados: 63
Autores: Cruz,Andre Freire; Pires,Marcio de Carvalho; Nascimento,Lennon Kaique Beda do; Ramos,Maria Lucrecia Gerosa; Oliveira,Sebastiao Alberto; Blum,Luiz Eduardo Bassay; Yamanishi,Osvaldo Kiyoshi.
ABSTRACT The use of cover crop in agricultural fields has been well elucidated, especially regarding nitrogen fixation from legume crops and their function as weed protection. Furthermore, to cover crops can benefit the soil microbial community. This study aimed to evaluate and compare the benefits of mulching and cover cropping systems on soil microbial growth and activity, and their effects on plant mineral nutrition in pomelo (Citrus maxima ) and macadamia ( Macadamia integrifolia ) orchards. The treatments included: 1) control [Glyphosate herbicide (Roundup at 4 l per ha)], 2) manual weed control, 3) mulching with dead leaves from their respective trees (macadamia and pomelo), 4) millet, 5) faba bean, 6) millet + faba bean. All the treatments were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pomelo; Faba bean; Macadamia; Millet; Mycorrhiza.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000400201

Development, sensitivity and uncertainty analysis of LASH model
Provedor de dados: 63
Autores: Beskow,Samuel; Mello,Carlos Rogério de; Norton,Lloyd Darrell.
Many hydrologic models have been developed to help manage natural resources all over the world. Nevertheless, most models have presented a high complexity regarding data base requirements, as well as, many calibration parameters. This has brought serious difficulties for applying them in watersheds where there is scarcity of data. The development of the Lavras Simulation of Hydrology (LASH) in a GIS framework is described in this study, which focuses on its main components, parameters, and capabilities. Coupled with LASH, sensitivity analysis, parameter range reduction, and uncertainty analysis were performed prior to the calibration effort by using specific techniques (Morris method, Monte Carlo simulation and a Generalized Likelihood Uncertainty...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: GLUE methodology; Morris method; Hydrologic modeling; Parameter ranges; Automatic calibration.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000300001

Correlation maps to assess soybean yield from EVI data in Paraná State, Brazil
Provedor de dados: 63
Autores: Figueiredo,Gleyce Kelly Dantas Araújo; Brunsell,Nathaniel Allan; Higa,Breno Hiroyuki; Rocha,Jansle Vieira; Lamparelli,Rubens Augusto Camargo.
ABSTRACT Vegetation indices are widely used to monitor crop development and generally used as input data in models to forecast yield. The first step of this study consisted of using monthly Maximum Value Composites to create correlation maps using Enhanced Vegetation Index (EVI) from Moderate Resolution Imaging Spectroradiometer (MODIS) sensor mounted on Terra satellite and historical yield during the soybean crop cycle in Paraná State, Brazil, from 2000/2001 to 2010/2011. We compared the ability of forecasting crop yield based on correlation maps and crop specific masks. We ran a preliminary regression model to test its ability on yield estimation for four municipalities during the soybean growing season. A regression model was developed for both...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: MODIS; Crop yield forecasting; Vegetation indices.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000500462

Knowledge-based digital soil mapping for predicting soil properties in two representative watersheds
Provedor de dados: 63
Autores: Menezes,Michele Duarte de; Silva,Sérgio Henrique Godinho; Mello,Carlos Rogério de; Owens,Phillip Ray; Curi,Nilton.
ABSTRACT: The estimation of soil physical and chemical properties at non-sampled areas is valuable information for land management, sustainability and water yield. This work aimed to model and map soil physical-chemical properties by means of knowledge-based digital soil mapping approach as a study case in two watersheds representative of different physiographical regions in Brazil. Two watersheds with contrasting soil-landscape features were studied regarding the spatial modeling and prediction of physical and chemical properties. Since the method uses only one value of soil property for each soil type, the way of choosing typical values as well the role of land use as a covariate in the prediction were tested. Mean prediction error (MPE) and root mean...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: ANOVA test; Spatial variability; Fuzzy logic; Typical values.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162018000200144

Resposta da alfafa a fontes de fósforo associadas ao gesso e à calagem
Provedor de dados: 63
Autores: Sarmento,Patrícia; Corsi,Moacyr; Campos,Fábio Prudêncio de.
O fósforo é um dos nutriente mais importante na produção de alfafa nos solos brasileiros. Diversas fontes de P são disponíveis no mercado e o fosfato de Gafsa (FG) é considerado tão eficiente como solúvel. A eficiência dos adubos fosfatados é afetada pela acidez do solo. O uso do gesso associado ao FG pode corrigir o perfil do solo em relação ao alumínio e diminuir a fixação do P no solo. Portanto, o objetivo deste trabalho foi avaliar num experimento em vasos a eficiência do superfosfato triplo (ST), do FG e do FG com gesso, aplicados antes e depois da calagem, nas doses de 50, 100 e 200 mg P dm-3. Foi utilizado um solo classificado como LATOSSOLO VERMELHO-AMARELO Alumínico. Foram efetuados três plantios de alfafa, realizando-se um corte no primeiro...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Medicago sativa; Fosfato de Gafsa; Superfosfato triplo; Gesso; Calagem.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000200023

Fatty acid profile, color and lipid oxidation of organic fermented sausage during chilling storage as influenced by acid whey and probiotic strains addition
Provedor de dados: 63
Autores: Wójciak,Karolina Maria; Karwowska,Małgorzata; Dolatowski,Zbigniew Józef.
Organic fermented sausages typically spoil during long-term storage due to oxidative rancidity. The application of natural antioxidants to meat stuffing is a major practice intended to inhibit the oxidation process and color changes. This study aimed to assess the effect of two unusual starter cultures: three probiotic strains (Lactobacillus casei LOCK 0900, Lactobacillus casei LOCK 0908 and Lactobacillus paracasei LOCK 0919) and lactic acid bacteria from acid whey on model fermented sausage type products focusing on oxidative stability by measuring instrumental color (L*, a*, b* values), conjugated dienes (CD), TBARS immediately after 21 days of ripening (0) and after 90 and 180 days of refrigerated storage (4 ºC). Determination of fatty acid composition,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Oxidation stability; Uncured; Functional food; Antioxidant.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162015000200124

Intraspecific tetraploid hybrids of Paspalum notatum: agronomic evaluation of segregating progeny
Provedor de dados: 63
Autores: Weiler,Roberto Luis; Dall'Agnol,Miguel; Simioni,Carine; Krycki,Karine Cristina; Pereira,Emerson André; Machado,Juliana Medianeira; Motta,Éder Alexandre Minski da.
ABSTRACT: For many decades, animal production in southern Brazil has been based on native forage grasses. Paspalum notatum Flügge (bahiagrass) is one of the most frequently used native grass in southern Brazil. The native germplasm of P. notatum is tetraploid and displays apomictic reproduction; hence, chromosome doubling of sexual diploid accessions is required to facilitate hybridization. The main goal of this study was to evaluate forage production and other agronomical evaluation of P. notatum intraspecific hybrids in order to obtain new varieties that could be registered and/or protected and launched as new cultivars in the future. Three tetraploid sexual genotypes were crossed with the ecotypes Bagual and André da Rocha. Biomass production (leaf,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bahiagrass; Hybridization; Forage yield.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162018000100036

Caracterização de rizóbios (Bradyrhizobium japonicum) e produtividade da soja
Provedor de dados: 63
Autores: LIMA,S.C.; LOPES,E.S.; LEMOS,E.G.M.
Fez-se um estudo de campo sobre a competição e a dinâmica de ocupação de sítios de nodulação de estirpes de Bradyrhizobium japonicum naturalizadas ou inoculadas em sementes. O ensaio foi instalado em Latossolo Vermelho Escuro utilizando blocos ao acaso, com 8 repetições dos seguintes tratamentos: A) controle sem inoculante; B) controle sem inoculante, com adubação nitrogenada; C) inoculante com cerca de 107 rizóbios/g (8g/kg de semente); D) inoculação com cerca de 1010 rizóbios/g (8g/kg de semente). Os inoculantes foram preparados com as estirpes recomendadas na ocasião, SMS - 314 (= SEMIA 587) e SMS - 463 (= SEMIA 5019 = 29W). A identificação das estirpes formadoras dos nódulos foi realizada em amostras coletadas aos 10, 42 e 70 dias após a germinação....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soja; Nodulação; Bactéria; Nodulation.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000300003

Cadmium effect on the association of jackbean (Canavalia ensiformis) and arbuscular mycorrhizal fungi
Provedor de dados: 63
Autores: Andrade,Sara Adrián López de; Jorge,Renato Atílio; Silveira,Adriana Parada Dias da.
The effect of cadmium (Cd) on mycorrhizal association and on shoot and root Cd concentration was investigated in jackbean plants under hydroponic conditions. The treatments consisted of the inoculation of three different species of arbuscular mycorrhizal fungi (AMF), Glomus etunicatum, G. intraradices and G. macrocarpum, and a non-inoculated control, two Cd (0 and 5 µmol L-1) and two P (1 and 10 mg L-1) levels in the nutrient solution. Mycorrhizal colonization, length of AMF extraradical mycelium, guaiacol peroxidase activity in roots, plant growth and root and shoot Cd and P concentrations were determined. Mycorrhizal status did not promote jackbean growth but in most of the cases mycorrhization increased root and shoot Cd concentrations. Cd ions were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Peroxidase; Cd accumulation; Extraradical mycelium; Phytoremediation; Hydroponics.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000400013

Desempenho vegetativo e produtivo de cultivares e linhagens de soja de ciclo precoce no município de Piracicaba-SP
Provedor de dados: 63
Autores: CÂMARA,G.M.S.; PIEDADE,S.M.S.; MONTEIRO,J.H.; GUERZONI,R.A.
Como parte da rede oficial do Estado de São Paulo relativa à competição de linhagens de soja, desenvolveu-se no município de Piracicaba-SP, durante o ano agrícola 1996/97, experimento de campo visando avaliar o desempenho vegetativo e produtivo de linhagens e cultivares de soja (Glycine max L. Merrill) pertencentes ao ciclo de maturação precoce. Delineado em blocos ao acaso com 20 tratamentos (linhagens e cultivares) e 4 repetições, o experimento foi instalado em Terra Roxa Estruturada eutrófica. As parcelas foram constituídas por 4 linhas espaçadas entre si de 0,50 m com 5,0 m de comprimento. Como padrões de comparação das novas linhagens, foram utilizados os cultivares IAS-5 (atualmente o mais cultivado no Estado de São Paulo) e IAC-17 (com elevada...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycine max; Cultivares; Linhagens; Grupo de maturação; Melhoramento genético.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000300008

REAÇÃO DA PINHA (Annona squamosa L.) A TRÊS ESPÉCIES DE FITONEMATÓIDES
Provedor de dados: 63
Autores: Monteiro,A.R.; Oliveira,C.M.G. de; Kuroki,A.
Em ensaio conduzido em vasos, a céu aberto, estudou-se a reação de Annona squamosa em relação a três nematóides fitoparasitos. As plantas foram inoculadas com 10.000 exemplares de Radopholus similis, Rotylenchulus reniformis ou Meloidogyne exigua por recipiente. Avaliaram-se, após três meses da inoculação, a altura das plantas, o peso fresco do sistema radicular e o número de nematóides nas raízes e no solo. O estudo revelou que a Annona squamosa comportou-se como resistente a Rotylenchulus reniformis e a Meloidogyne exigua, e intolerante a Radopholus similis.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Annona squamosa; Meloidogyne exigua; Rotylenchulus reniformis; Radopholus similis.
Ano: 1996
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161996000200005

QUALIDADE DE SEMENTES DE MILHO (Zea mays L.) SOB  CONDIÇÕES DE SECAGEM INTERMITENTE
Provedor de dados: 63
Autores: Ahrens,D.C.; BarroS,A.S.R.; Villela,F.A.; Lima,D.
O trabalho avaliou a remoção de água e a qualidade de sementes de milho submetidas a secagem intermitente rápida e lenta, sob temperaturas do ar de 60oC e 70oC, respectivamente. Para tanto, na safra 94/95 sementes básicas da cultivar IAPAR 26, apresentando 22% de água, foram colhidas com automotriz, em Ponta Grossa - PR, e secadas em secadores comerciais, utilizando-se como tratamento referencial a secagem à sombra até 13% de água. No transcurso das secagens a redução do teor de água das sementes foi monitorado, em intervalos de trinta minutos, para o estabelecimento das velocidades e curvas de secagem. A qualidade fisiológica foi avaliada nas sementes amostradas, antes da secagem, no estágio intermediário e ao final das secagens, através dos testes de...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays L.; Secagem; Qualidade; Sementes; Milho.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000200023

Inheritance of pinacle exsertion in rice
Provedor de dados: 63
Autores: Cruz,Renata Pereira da; Milach,Sandra Cristina Kothe; Federizzi,Luiz Carlos.
Incomplete panicle exsertion is one of the symptoms of cold injury at the reproductive stage of the rice plant (Oryza sativa L.), which damages grain yield and raises disease incidence. For this reason, panicle exsertion is a better indicator of cold tolerance under field conditions than spikelet sterility, which may also be affected by other climatic factors. This work studies the variability of degree of panicle exsertion in rice, under the Southern Brazilian environmental conditions and determines the inheritance and heritability of this trait. Four rice genotypes of different cool temperature reactions at the reproductive stage were crossed and field evaluated, with the F2 generation, in relation to the degree of panicle exsertion and spikelet...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Oryza sativa L.; Chilling temperature; Cold tolerance; Complete panicle exsertion; Heritability.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000500009

Activity of cellulase from Thermoactinomycetes and Bacillus spp. isolated from Brassica waste compost
Provedor de dados: 63
Autores: Chang,Chen-Chin; Ng,Chang-Chai; Wang,Chung-Yi; Shyu,Yuan-Tay.
Plant wastes present a high cellulose content, which is an ideal organic material for composting. Five strains of thermophiles from processed Brassica waste were isolated, and the hydrolytic activity on various cellulosic biomass substrata and their temperature profiles were determined. 16S rRNA sequencing identified these strains as Thermoactinomyces and Bacillus spp. Maximal cellulase activity corresponded to 2.3 U mL-1 of enzyme. The application of these strains on Brassica rapa residues demonstrates increased total nitrogen content). TA-3, a Thermoactinomycetes sp. strain, performs best among all inoculants, increasing the nitrogen content from 0.74 to 0.91%, and decreasing the carbon content from 15.4 to 12.2%, showing its high efficiency and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cellulose degrading; Enzymes; Vegetable wastes.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000300004

CONDUTIVIDADE HIDRÁULICA NO PROCESSO DE ELUIÇÃO EM UM SOLO BRUNO-NÃO-CÁLCICO
Provedor de dados: 63
Autores: ANDRADE,L.N.V. DE; CRUCIANI,D.E.
Com o objetivo de avaliar o efeito da porcentagem de sódio trocável do solo e da concentração eletrolítica da água de percolação, sobre a condutividade hidráulica em um solo Bruno-Não-Cálcico da região do Rio Salitre-BA, o presente experimento foi conduzido em condições de laboratório e consistiu da determinação da condutividade hidráulica do solo saturado utilizando-se diferentes soluções percolantes, da condutividade elétrica da solução percolada e dos teores de sódio antes e após a eluição com as soluções. Utilizando a câmara de membrana de pressão de Richards, foram determinados os teores de sódio deslocado a diferentes tensões. Uma baixa correlação entre a condutividade hidráulica e a porcentagem de sódio intercambiável foi encontrada. A aplicação da...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Condutividade hidráulica; Eluição; Sódio trocável.
Ano: 1996
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161996000100006

Gafsa rock phosphate and triple superphosphate for dry matter production and P uptake by corn
Provedor de dados: 63
Autores: Corrêa,Rossini Mattos; Nascimento,Clístenes Williams Araújo do; Souza,Silvana Keely de Sá; Freire,Fernando José; Silva,Gleibson Barbosa da.
Crops in general make poor use of phosphorous fertilizer and, as a result, recommended rates and production costs are very high. Phosphorus can be made more readily available to plants by proper management of phosphate fertilization, selecting both, type of fertilizer and application method. This study was carried out to evaluate the efficiency of the natural Gafsa rock phosphate and the triple superphosphate on dry matter production and P uptake by corn plants cultivated in a greenhouse. Fertilizers were applied localized and broadcast/incorporated on to two soils with contrasting phosphorus capacity factors (PCF). Rock phosphate broadcast application was as efficient as triple superphosphate in increasing corn plant dry matter in the Tropudult, with...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Rock phosphate; Phosphate fertilization; Phosphorus fixation.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000200011

Biodiversity and distribution of arbuscular mycorrhizal fungi in Araucaria angustifolia forest
Provedor de dados: 63
Autores: Moreira,Milene; Baretta,Dilmar; Tsai,Siu Mui; Gomes-da-Costa,Sandra Maria; Cardoso,Elke Jurandy Bran Nogueira.
Araucaria angustifolia (Bert.) O. Ktze. is an endangered Brazilian coniferous tree that has been almost exterminated in the native areas because of uncontrolled wood exploitation. This tree has been shown to be highly dependent on arbuscular mycorrhizal fungi (AMF) and, therefore, AMF may be essential for forest sustainability and biological diversity. Root colonization, density and diversity of AMF spores were assessed in two Araucaria forest stands at the State Park of Alto Ribeira (PETAR), at two sampling dates: May and October. A comparison was made between a mature native stand composed of Araucaria trees mixed into a variety of tropical trees and shrubs, without any sign of anthropogenic interference (FN) and an Araucaria stand planted in 1987 (R),...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brazilian Pine; Diversity; Spore density; Root colonization; Multivariate analysis.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000400010

Population dynamics of Cyrtomon luridus Boheman (Coloptera: Curculionidae) on Duboisia sp. (Solanaceae) in Brazil
Provedor de dados: 63
Autores: Paulo,Tironi; von Treuenfels,Adrian; Parra,José Roberto Postali.
Cyrtomon luridus (Boheman) has adapted to the medicinal plant Duboisia sp., introduced from Australia. Its larvae feed on roots, causing up to 100% mortality damages. The population dynamics and biological cycle were studied to determine future control methods in Duboisia sp., in Arapongas, Paraná State, Brazil, from 1993 to 1996. C. luridus presented annual life cycle in Duboisia sp. under natural conditions. The larval development period was 120 to 150 days, from January to May, reaching an average size of 19.0 ± 2.0 mm in soil depth ranging on 24.9 ± 8.6 cm to 45.0 ± 10.0 cm. The beginning of the pupal phase happened in April. The larval-adult viability ranged on 7.5% to 19.6%. The typical symptoms of attack appeared in an infestation level of 60 larvae...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Microctonus; Biological cycle; Medicinal plant; Control; Longevity.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000500011

ALTERAÇÃO DE ATRIBUTOS QUÍMICOS DO HORIZONTE SUPERFICIAL DE UM LATOSSOLO E UM PODZÓLICO COM A CALAGEM
Provedor de dados: 63
Autores: CAMARGO,O.A. de; CASTRO,O.M. de; VIEIRA,S.R; QUAGGIO,J.A.
A calagem é essencial na agricultura moderna para aumentar a produtividade das culturas e a eficiência do uso de adubos. A adição de calcário normalmente altera atributos químicos do solo. O objetivo do presente estudo foi verificar algumas dessas alterações no horizonte superficial de um latossolo vermelho-escuro argiloso e um podzólico vermelho-amarelo textura média/argilosa. Os atributos estudados foram: soma de bases, pH em H2O e KCl N, Al3+, H+, capacidade de troca catiônica (CTC) a pH 7,0 e ao pH do solo, capacidade de troca aniônica (CTA), fosfato e sulfato extraíveis, índice de adsorção de P e disponibilidade de Fe, Mn, Zn e Cu. Com os dados obtidos pôde-se concluir que a calagem aumentou o pH, a soma de bases, a CTC a pH do solo e o teor de...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Calagem; Latossolo; Podzólico; Atributos químicos.
Ano: 1997
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161997000100001

Differential growth retardation and Myofibrillar fragmentation in rats submitted to feed restriction and realimentation
Provedor de dados: 63
Autores: Leonardo,Eric Franchi; Delgado,Eduardo Francisquine; Bagaldo,Adriana Regina; Lanna,Dante Pazzanese Duarte; Paz,Claudia Cristina Paro de.
Feed regimens alter muscle growth rate, hence they might impact the proteolytic system involved in tenderization during meat conditioning. The aim of this project was to verify the effects of feed restriction regimens on muscular and animal growth and their impact on postmortem myofibrillar fragmentation. The regimens were: 1) Feeding ad libitum for 11 d (Al/2); 2) Feed restriction (60% of Net Energy for maintenance - NEm) for 11 d (Rt/2); 3) Ad libitum for 22 d (Al); 4) Ad libitum for 4 d and feed restriction (60% NEm) for 18 d (Rt); 5) Ad libitum for 19 d and 3 d of fast (Ft); 6) Feed restriction (60% NEm) for 11 d and ad libitum until 22 d (Ral). The regimens Al/2 and Rt/2 had different intestine weights (19.3 ± 1.1 and 15.8 ± 1.9 g, respectively; P...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Myofibrillar fragmentation index; Muscle; Intestine; Liver.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000200003

Assessing soil carbon stocks under pastures through orbital remote sensing
Provedor de dados: 63
Autores: Szakács,Gabor Gyula Julius; Cerri,Carlos Clemente; Herpin,Uwe; Bernoux,Martial.
The growing demand of world food and energy supply increases the threat of global warming due to higher greenhouse gas emissions by agricultural activity. Therefore, it is widely admitted that agriculture must establish a new paradigm in terms of environmental sustainability that incorporate techniques for mitigation of greenhouse gas emissions. This article addresses to the scientific demand to estimate in a fast and inexpensive manner current and potential soil organic carbon (SOC) stocks in degraded pastures, using remote sensing techniques. Four pastures on sandy soils under Brazilian Cerrado vegetation in São Paulo state were chosen due to their SOC sequestration potential, which was characterized for the soil depth 0-50 cm. Subsequently, a linear...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brazil; Leaf Area Index; Soil organic carbon; Pasture degradation; Spectral reflectance; Climate change.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000500010

Repeated geophysical measurements in dry and wet soil conditions to describe soil water content variability
Provedor de dados: 63
Autores: Benedetto,Daniela De; Montemurro,Francesco; Diacono,Mariangela.
ABSTRACT: There is an increasing interest in the application of geophysical surveys to assess the soil water content (SWC) variation in both spatial and temporal scales. In this work, a geophysical survey was carried out at an experimental farm in dry and wet conditions. We determined the SWC data measured with the gravimetric method, apparent electrical conductivity by electromagnetic induction (EMI) and amplitude of Ground Penetrating Radar (GPR) data at different frequencies. Geophysical sensors are an efficient tool for soil mapping at high resolution; however; there is a need to improve the knowledge on their capabilities and limitations under field conditions, especially for GPR. The geophysical survey provides an example of the application of these...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Electromagnetic induction; Ground penetrating radar; Spatial and temporal variability; Cross correlogram.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000500501

Isolamento e caracterização de bactérias degradadoras do herbicida diuron
Provedor de dados: 63
Autores: Roque,Milton Ricardo de Abreu; Melo,Itamar Soares de.
Solos provenientes de áreas cultivadas com cana-de-açúcar, e histórico de utilização do herbicida diuron, foram utilizados para isolamento e caracterização de linhagens bacterianas com potencial de degradar este herbicida. As linhagens foram isoladas de solos da rizosfera de cana-de-açúcar e de solos das entre linhas. Noventa e oito linhagens foram isoladas, das quais 27 foram selecionadas para avaliação do crescimento em meio mineral sólido suplementado com diuron nas concentrações de 5, 10 e 20 mig mL-1. Neste experimento, 5 linhagens apresentaram um crescimento exponencial entre 0-48 horas (EMBRAPA-CNPMA D12-12, D12-14 e D16-12) e entre 0-110 horas (EMBRAPA-CNPMA D11-9 e D12-18), similar ao controle. A linhagem EMBRAPA-CNPMA D12-12 identificada como...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Acinetobacter baumannii; Biodegradação; Herbicidas; Curva de crescimento.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000400020

Cotton response to mepiquat chloride and temperature
Provedor de dados: 63
Autores: Rosolem,Ciro A.; Oosterhuis,Derrick M.; Souza,Fabio S. de.
Gibberellin inhibitor growth regulators are used for cotton (Gossypium hirsutum L.) canopy manipulation to avoid excess growth and yield losses. However, under temperatures below or over the optimum for cotton production the effect of mepiquat chloride (MC) has not always been significant. In this experiment, cotton plants were grown in growth chambers to study the response to MC as affected by temperature and to determine if an increase in dose could overcome the temperature effects. Mepiquat chloride was applied at rates of 0, 15 and 30 g ai ha-1 at the pinhead square stage. Plants were then grown under three temperature regimes: 25/15 °C, 32/22 °C, and 39/29 °C (day/night temperatures) for 51 days. Higher temperatures increased plant height,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Plant growth regulator; Cotton growth; Photosynthesis.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162013000200004

CARACTERIZAÇÃO E GÊNESE DE UMA TOPOSSEQUÊNCIA LATOSSOLO AMARELO-PODZOL ORIGINADO DE MATERIAL DA FORMAÇÃO  BARREIRAS - ESTADO DE ALAGOAS
Provedor de dados: 63
Autores: DEMATTÊ,J.L.I.; MAZZA,J.A; DEMATTÊ,J.A.M.
Características morfológicas, físicas, químicas e mineralógicas foram determinadas em 5 perfis ao longo de uma topossequência numa depressão fechada de Latossolo Amarelo até Podzol em tabuleiro a 60 km de Maceió, Estado de Alagoas, no sentido de elucidar os principais processos envolvidos na formação dos solos. A formação dos solos está diretamente relacionada às condições de drenagem devido as posições que eles ocupam no relevo. O Latossolo Amarelo ocupa a posição de transição tabuleiro-encosta, o que permite uma boa drenagem e intenso intemperismo, enquanto que no outro extremo menos intemperizado ocorre o Podzol, ocupando posições de depressão no relevo, de drenagem imperfeita. Os solos Podzólico Amarelo Latossólico, Podzólico Amarelo com fragipãs e...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pedogênese; Topossequência; Drenagem; Tabuleiro; Duripã; Fragipã.
Ano: 1996
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161996000100004

Analysis of the stress-inducible transcription factor SsNAC23 in sugarcane plants
Provedor de dados: 63
Autores: Ditt,Renata Fava; Gentile,Agustina; Tavares,Rafael Garcia; Camargo,Sandra Rodriguez; Fernandez,Jorge Hernandez; Silva,Marcio Jose da; Menossi,Marcelo.
Stresses such as cold and drought can impair plant yield and induce a highly complex array of responses. Sugarcane (Saccharum spp.) is cultivated in tropical and subtropical areas and is considered a cold-sensitive plant. We previously showed that cold stress induces the expression of several genes in in vitro sugarcane plantlets. Here we characterize one of those genes, SsNAC23, a member of the NAC family of plant-specific transcription factors, which are induced by low temperature and other stresses in several plant species. The expression of SsNAC23 was induced in sugarcane plants exposed to low temperatures (4ºC). With the aim of further understanding the regulatory network in response to stress, we used the yeast two-hybrid system to identify...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: SsNAC; In situ hybridization cold stress yeast two hybrid.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000400010

Mineral and organomineral fertirrigation in relation to quality of greenhouse cultivated melon
Provedor de dados: 63
Autores: Fernandes,André Luís Teixeira; Rodrigues,Guilherme Pádua; Testezlaf,Roberto.
Fertirrigation of melon still presents problems in relation to the type of the fertilizer used, mainly the biofertilizers. This experiment, installed in Uberaba, MG, Brazil, in a plastic module greenhouse of 768 m², tested treatments consisting of the conventional mineral fertirrigation and the organic fertirrigation, using two frequencies: daily and weekly. The best yields were obtained with daily fertilizer application, with superiority in relation to biofertilizers, with yield of 45.5 t ha-1 of fruit. This value was higher as compared to chemical products, that lead to a yield of 42.4 t ha-1. The weekly fertigation had lower productivities, and in this case, the biofertilizers also overcame the mineral, on the average 2.0 t ha-1. The best melon soluble...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cucumis melo; Biofertilizers; Fruit quality.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000100022

Resistance to Septoria lycopersici in Solanum (section Lycopersicon) species and in progenies of S. lycopersicum × S. peruvianum
Provedor de dados: 63
Autores: Satelis,Jaqueson Ferreira; Boiteux,Leonardo Silva; Reis,Ailton.
Septoria leaf spot (Septoria lycopersici) is one of the major fungal diseases of tomatoes (Solanum lycopersicum) in tropical and subtropical regions with humid climates and/or in areas cultivated under sprinkler irrigation systems. Sources of resistance have been found in accessions of Solanum (section Lycopersicon) species. However, many of the described sources are not effective under Brazilian conditions. The objective of this work was to evaluate wild and cultivated Solanum (section Lycopersicon) germplasm to S. lycopersici isolates. A collection of 124 accessions was initially evaluated under greenhouse conditions. Ten accessions were highly resistance (HR), whereas 33 were classified as having a resistant (R) response to S. lycopersici isolates....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Breeding; Disease control; Septoria leaf spot.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000300012

Cowpea symbiotic efficiency, pH and aluminum tolerance in nitrogen-fixing bacteria
Provedor de dados: 63
Autores: Soares,Bruno Lima; Ferreira,Paulo Avelar Ademar; Oliveira-Longatti,Silvia Maria de; Marra,Leandro Marciano; Rufini,Marcia; Andrade,Messias José Bastos de; Moreira,Fatima Maria de Souza.
Cowpea (Vigna unguiculata) cultivation in northern and northeastern Brazil provides an excellent source of nutrients and carbohydrates for the poor and underprivileged. Production surplus leads to its consumption in other regions of Brazil and also as an export commodity. Its capacity to establish relationships with atmospheric nitrogen-fixing bacteria is crucial to the reduction of production costs and the environmental impact of nitrogen fertilizers. This study assessed the symbiotic efficiency of new strains of symbiotic nitrogen-fixing bacteria with cowpea and their tolerance to pH and aluminum. Twenty-seven strains of bacteria from different soils were evaluated under axenic conditions. These strains were compared to the following inoculant strains:...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vigna unguiculata; Bradyrhizobium; Burkholderia; Native rhizobia.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162014000300001

Efeitos da radiação gama do Cobalto-60 em ovos de Tribolium castaneum (Herbst., 1797) (Coleoptera: Tenebrionidae)
Provedor de dados: 63
Autores: Fontes,L. S.; Arthur,V.
Este trabalho teve por objetivo determinar as doses esterilizantes e letal para ovos de T. castaneum (Herbst., 1797) (Coleoptera: Tenebrionidae), através de doses crescentes de radiação gama. Utilizou-se uma fonte de Cobalto-60, tipo Gammabeam-650, com taxa de dose de 1,28 kGy/hora. O experimento foi conduzido sob condições controladas com temperatura de 25 ± 2°C e umidade relativa de 70 ± 5%. As doses letal e esterilizante para os ovos foram respectivamente 30 e 20 Gy.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Radiação gama; Ovos; Tribolium castaneum.
Ano: 1994
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000300004

Erratum
Provedor de dados: 63
Tipo: Info:eu-repo/semantics/report
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000500015

Aminoethoxyvinylglycine: isolated and combined with other growth regulators on quality of ‘Brookfield’ apples after storage
Provedor de dados: 63
Autores: Brackmann,Auri; Thewes,Fabio Rodrigo; Anese,Rogerio de Oliveira; Both,Vanderlei; Linke Junior,Wanderlei; Schultz,Erani Eliseu.
Growth regulators are used in the production of apples worldwide, especially to extend the harvest period and maintain postharvest quality. This study aimed to investigate the effects of applying aminoethoxyvinylglycine (AVG) in isolation as well as in combination with other growth regulators and postharvest techniques on the harvest quality and storage potential of ‘Brookfield’ apples (Malus domestica), a ‘Gala’ strain. Fruit receiving AVG only had the highest starch content and the highest titratable acidity at harvest. After 8 months of storage, the AVG + 1-MCP (1-methylcyclopropene) and AVG + ABS (ethylene absorption) conserved higher flesh firmness than to all the other treatments. Naphthaleneacetic acid (NAA) application induced ACC oxidase enzyme...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Malus domestica; Postharvest quality; Skin color; Ethephon; Naphthaleneacetic acid.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162015000300221

Reaction of peach tree genotypes to bacterial leaf spot caused by Xanthomonas arboricola pv. prunis
Provedor de dados: 63
Autores: Medeiros,José Gilberto Sousa; Citadin,Idemir; Santos,Idalmir dos; Assmann,André Paulo.
Bacterial leaf spot (BLS), caused by Xanthomonas arboricola pv. pruni, is one of the most important diseases in Brazilian peach [Prunus persica (L.) Batsch] orchards and all over the world. The main objective of this study was to evaluate for BLS sensitivity of peach genotypes. Evaluations of thirty genotypes were carried out during the onset of the disease, for incidence, severity and defoliation, in field conditions. Pearson's correlations between the percentage of defoliation and leaf severity rating were performed. Genotypes 'Conserva 985', 'Conserva 871', 'Conserva 1129', and 'Tropic Snow', as resistance sources, and 'Conserva 1153', 'Bonão', 'Conserva 1125', and 'Atenas', as susceptible to BLS, were submitted to detached-leaf bioassay and greenhouse...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Disease resistance; Disease severity.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000100009

Physical properties of soils under intensive agricultural management
Provedor de dados: 63
Autores: Soares,Jorge Luís Nascimento; Espindola,Carlos Roberto; Pereira,Walcylene Lacerda Matos.
Pedologic alterations after long-term sugar cane (Saccharum officinarum) cropping cycles under traditional soil management systems were studied on a farm in Bariri, SP, Brazil. A toposequence was established to evaluate the effects of the soil position in the relief in changing soil physical attributes. Morphological field descriptions and laboratory analyses were carried out on vertical profiles of the upper, middle and lower thirds of a Typic Haplorthox slope. Soil bulk density and macroporosity changed along the toposequence reflecting on soil hydrodynamics, especially in the lower slope parts. At sites with high clay levels, empty spaces were filled forming block shaped structures together with the micro-aggregate structure. The intensive cultivation...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil management; Toposequence; Aggregates; Soil micromorphology.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000200012

Termite activity in relation to natural grassland soil attributes
Provedor de dados: 63
Autores: Kaschuk,Glaciela; Santos,Julio Cesar Pires; Almeida,Jaime Antonio; Sinhorati,Deise Cristina; Berton-Junior,João Francisco.
Soil-feeding termites transport soil for mound building, and this process can affect soil characteristics. To verify the influence of soil termite activity on soil characteristics, samples were collected from top, bottom and center of termite mounds, and of the adjacent area, to assess chemical and physical properties and mineralogical composition. Four replicates of termite mounds and respective adjacent areas were randomly sampled in Lages, Capão Alto, Painel, São José do Cerrito and Coxilha Rica (State of Santa Catarina, southern Brazil). Results of chemical analyses showed a greater content of K, P, Ca, Mg and organic C in the inner part of termite mounds, accompanied by lower pH in relation to soil of the adjacent area. There were no differences...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Chemical and physical soil properties; Clay minerals; Soil biology; Termite mounds.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000600013

Mineralogical and chemical attributes of soils from the Brazilian Atlantic Forest domain
Provedor de dados: 63
Autores: Cunha,Alexson de Mello; Fontes,Maurício Paulo Ferreira; Lani,João Luiz.
ABSTRACT: The Atlantic Forest is one of the most important and yet the most devastated Brazilian biome, occupying in the past the majority of the East Atlantic Coast. Therefore, a detailed knowledge of the soils near the coastal line influenced by this biome is essential for land use and management of these environments. The aim of this study was to acquire a deeper knowledge of the chemistry, mineralogy and genesis of soils in two micro-watersheds of the Atlantic Forest Biome. Eight soil profiles were sampled and described along one transect. Both young and more developed soils exhibit low fertility and low Fe2O3 content. The Oxic Dystrudepts are less dystrophic than the other soils studied and exhibit greater availability of K+, due to the mixing of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Forest biome; Coastal plains; Coastal uplands; Pedogenesis.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162019000100082

Cloning and expression of cellulase XF-818 of Xylella fastidiosa in Escherichia Coli
Provedor de dados: 63
Autores: Wulff,Nelson Arno; Carrer,Helaine; Pascholati,Sérgio Florentino.
Xylella fastidiosa's genome was the first of a plant pathogen to be completely sequenced. Through comparative sequence analysis many genes were identified and, among them, several potentially involved in plant-pathogen interaction. However, the biological role of each gene should be assigned experimentally. On this regard, heterologous protein expression is a powerful tool to produce proteins from such genes, allowing their characterization. X. fastidiosa lives inside xylem vessels and eventually would degrade pit membranes from xylem cells to move radialy into the host. The identification of several putative plant cell wall degrading enzymes on X. fastidiosa genome prompted the assession of the function of such proteins. The open reading frame (ORF)...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Citrus variegated chlorosis; Cellulases; Cloning and expresssion.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000400016

Propriedades hidráulicas de um solo não saturado utilizando-se o permeâmetro a disco
Provedor de dados: 63
Autores: Silva,Edvane Borges da; Libardi,Paulo Leonel.
No presente trabalho foram determinadas as propriedades hidráulicas condutividade, (K) e sorvidade, (S). Os valores destas propriedades foram obtidos a partir de experimentos com o permeâmetro a disco (r = 0,125 m), nas profundidades de 0,20 m e 0,40 m, em Piracicaba, SP. O solo é classificado como Terra Roxa Estruturada latossólica, de densidade 1500 kg m-3, a 0,20 m, e de 1540 kg m-3, a 0,40 m, com texturas franco-argilosa e argilosa, respectivamente. Para a determinação da condutividade hidráulica, K, utilizou-se a equação de Wooding, enquanto a sorvidade, S, foi determinada a partir da regressão da porção linear do gráfico da infiltração acumulada (I) versus a raiz quadrada do tempo (t½). Os valores obtidos da variação de umidade e da sorvidade...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Condutividade hidráulica; Sorvidade; Permeâmetro a disco.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000300024

Selection of Beauveria bassiana (Bals.) Vuill. and Metarhizium anisopliae (Metsch.) Sorok. for the control of the mite Mononychellus tanajoa (Bondar)
Provedor de dados: 63
Autores: Barreto,Rodrigo Soares; Marques,Edmilson Jacinto; Gondim Jr.,Manoel Guedes Corrêa; Oliveira,José Vargas de.
The green mite, Mononychellus tanajoa (Bondar) (Acari: Tetranychidae), is considered to be one of the key pests in cassava, Manihot esculenta Crants, leading to considerable field losses. In this study, ten Beauveria bassiana (Bals.) Vuill. and ten Metarhizium anisopliae (Metsch.) Sorok. isolates were evaluated with regard to their potential as biological control agents against adult M. tanajoa females. The total mortality percentage of M. tanajoa caused by B. bassiana ranged from 13.0 to 97.0%, with confirmed mortality rates extending from 9.0 to 91.0% and LT50 varying from 4.2 to 17.0 days. The M. anisopliae isolates showed total mortality percentages ranging from 12.0 to 45.0% with confirmed mortality rates extending from 8.0 to 45.0%, and LT50 varying...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Entomopathogenic fungi; Cassava green mite; Microbial control.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000600015

DESEMPENHO VEGETATIVO DE CULTIVARES DE SOJA [Glycine max (L.) Merrill] EM ÉPOCAS NORMAL E SAFRINHA
Provedor de dados: 63
Autores: Marchiori,Luis Fernando Sanglade; Câmara,Gil Miguel de Sousa; Peixoto,Clóvis Pereira; Martins,Mônica Cagnin.
Este trabalho foi conduzido em Piracicaba - SP e constou da avaliação do desenvolvimento de três cultivares de soja manejados sob cinco densidades, em duas épocas de semeadura. Foram utilizados os cultivares de soja IAC-17, IAC-12 e IAC-19 com ciclos de maturação precoce, semi-precoce e médio, respectivamente, conduzidos no espaçamento de 0,50 m, com 10, 15, 20, 25 e 30 plantas por metro linear. Adotou-se o delineamento em blocos ao acaso com 15 tratamentos (3 cultivares x 5 densidades), repetidos três vezes. Cada parcela foi composta por 5 linhas com 5 metros, onde foram avaliados os seguintes parâmetros: altura final de planta, altura de inserção da primeira vagem, diâmetro da haste principal, número final de nós vegetativos, número de ramificações por...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soja; Cultivar; Época de semeadura safrinha; População.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000200018

Descartes de origem animal e o crescimento e ganho de peso do jacaré-de-papo-amarelo, Caiman latirostris (Daudin, 1802), em cativeiro
Provedor de dados: 63
Autores: Sarkis-Gonçalves,Fabianna; Castro,Ana Maria Vicente; Verdade,Luciano Martins.
O custo da alimentação é o principal fator limitante para a criação de jacarés em cativeiro. O uso de descartes e subprodutos como fontes de alimento em fazendas de criação de jacarés poderá auxiliar a resolver este problema. No presente estudo, quatro diferentes tipos de descartes provenientes da produção animal foram avaliados como alimento para o jacaré-de-papo-amarelo (Caiman latirostris) durante o primeiro ano de vida. Um total de 120 filhotes provenientes de seis ninhadas foram mantidos em quatro diferentes tanques dentro de uma estufa plástica. As seguintes dietas foram usadas: peixe, suino, frango e mista (peixe + suino + frango em iguais proporções). O delineamento experimental foi de ANOVA por blocos. Ganho de peso e taxas de crescimento do...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Manejo de fauna; Manejo alimentar; Criação de jacarés.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000200006

Selected mild strains of Passion fruit woodiness virus (PWV) fail to protect pre-immunized vines in Brazil
Provedor de dados: 63
Autores: Novaes,Quelmo Silva de; Rezende,Jorge Alberto Marques.
The Passion fruit woodiness virus (PWV) is the most important virus affecting passion fruit (Passiflora edulis f. flavicarpa Deg.) crops in Brazil. The main purpose of this work was to select mild strains of PWV and to evaluate their protective effect against a severe strain of the virus. Three mild strains were selected from outstanding plants found in orchards severely affected by the virus (F-101, F-102 and F-103) and three others were obtained from blisters formed in passion fruit vine leaves showing mosaic (F-99, F-144 and F-145). The protective effect of the mild strains was evaluated for vines under greenhouse and field conditions. Plants pre-immunized with mild strains F-101, F-102 and F-144, in a greenhouse, had partial protection against the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Passiflora sp.; Potyvirus; Cross protection.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000400014

Forage yield and persistence of red clover progenies in two environments
Provedor de dados: 63
Autores: Montardo,Daniel Portella; Dall'Agnol,Miguel; Paim,Nilton Rodrigues.
Red clover (Trifolium pratense L.) is one of the most important temperate legume species, used to lessen the lack of forage during the critical fall-winter period in Rio Grande do Sul, RS, Brazil. However, its utilization has been restricted mainly because of its lack of persistence. This work evaluates the dry matter yield and persistence of red clover half-sib progenies in two physiographic regions of RS: "Depressão Central", in Eldorado do Sul and "Encosta Superior do Nordeste", in Veranópolis. Experiments were carried out for two growing seasons and results were compared to two red clover commercial checks, Qüiñequeli and Estanzuela 116. The region of Veranópolis was more adequate for red clover forage production, enabling better yield and persistence....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Environment; Genotype; Plant breeding.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000300005

Performance of advanced generation from a hybrid Japanese cucumber
Provedor de dados: 63
Autores: Oviedo,Victoria Rossmary Santacruz; Godoy,Amanda Regina; Cardoso,Antonio Ismael Inácio.
Inbreeding reduces the vigor in plants as a result of a decrease in the proportion of heterozygous loci. However, the influence of inbreeding is different among the species. The objective of this work was to evaluate the inbreeding depression in a cucumber Japanese population. An F2 population was obtained from a commercial hybrid (Natsu suzumi), which was considered as S0 population. S1, S2, S3, S4 and S5 progenies were obtained by the 'Single Seed Descent' methodology. A complete blocks design with seven treatments (different generations of self pollination - S0 to S5 and the hybrid Natsu suzumi), and six replications of five plants per plot was used in protected cultivation from Aug. 21 to Nov. 29, 2002. Number of leaves, length of the main stem, number...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cucumis sativus L.; Breeding; Heterosis.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000500016

A decision-tree-based model for evaluating the thermal comfort of horses
Provedor de dados: 63
Autores: Maia,Ana Paula de Assis; Oliveira,Stanley Robson de Medeiros; Moura,Daniella Jorge de; Sarubbi,Juliana; Vercellino,Rimena do Amaral; Medeiros,Brenda Batista Lemos; Griska,Paulo Roberto.
Thermal comfort is of great importance in preserving body temperature homeostasis during thermal stress conditions. Although the thermal comfort of horses has been widely studied, there is no report of its relationship with surface temperature (T S). This study aimed to assess the potential of data mining techniques as a tool to associate surface temperature with thermal comfort of horses. T S was obtained using infrared thermography image processing. Physiological and environmental variables were used to define the predicted class, which classified thermal comfort as "comfort" and "discomfort". The variables of armpit, croup, breast and groin T S of horses and the predicted classes were then subjected to a machine learning process. All variables in the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Feature selection methods; Data mining; Surface temperature; Infrared thermography; Thermoregulation.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162013000600001

Accumulation of organic and inorganic solutes in NaCl-stressed sorghum seedlings from aged and primed seeds
Provedor de dados: 63
Autores: Oliveira,Alexandre Bosco de; Alencar,Nara Lídia Mendes; Prisco,José Tarquinio; Gomes-Filho,Enéas.
Although it has been known that the seed's physiological potential affects its response to osmoconditioning and abiotic stresses, researches involving seed aging and priming associated to abiotic stresses are scarce. The aim of this work was to evaluate the role of seed priming on salt tolerance in sorghum seedlings from seeds with two vigor levels (aged or non-aged) and to verify the organic and inorganic solute contributions as osmoregulators in NaCl-stressed seedlings from aged and primed seeds. The combinations of two seed vigor levels (aged or not), two seed types (primed or not) and two salinity levels (exposed to NaCl at 100 mM or not) were evaluated. In low physiological quality seeds (aged seeds), priming provided an attenuation of salinity's...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sorghum bicolor; Accelerated aging; Priming; Salinity; Osmoregulation.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000600004

Isolation and screening for plant growth-promoting (PGP) actinobacteria from Araucaria angustifolia rhizosphere soil
Provedor de dados: 63
Autores: Vasconcellos,Rafael Leandro Figueiredo de; Silva,Mylenne Calciolari Pinheiro da; Ribeiro,Carlos Marcelo; Cardoso,Elke Jurandy Bran Nogueira.
Actinobacteria are capable of playing several different roles in soil ecosystems. These microorganisms affect other organisms by producing secondary metabolites and are responsible for the degradation of different complex and relatively recalcitrant organic compounds. In our survey of actinobacteria isolated from the rhizosphere of Araucaria angustifolia, five culture media (AI, WYE, YCED, MSSC and LNMS) were compared for their effectiveness in isolating these microorganisms. When summing up all the isolates randomly obtained, we got 103 isolates. After isolation, the phosphate-solubilizing ability and the "in vitro" production of indole-acetic acid and chitinases were evaluated. The AI medium was ineffective for actinobacteria isolation, when it was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brazil Pine; Selective culture media; Indole-acetic acid; Chitinase; Phosphate solubilization.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000600019

Growth rates and yields of cassava at different planting dates in a tropical savanna climate
Provedor de dados: 63
Autores: Phoncharoen,Phanupong; Banterng,Poramate; Vorasoot,Nimitr; Jogloy,Sanun; Theerakulpisut,Piyada; Hoogenboom,Gerrit.
ABSTRACT: Details on growth and yield for cassava planted on different dates are useful for determining suitable genotypes for particular growing seasons. Our aim was to study growth and yield of cassava planted on different dates. Four cassava genotypes (Kasetsart 50, Rayong 9, Rayong 11 and CMR38-125-77) were evaluated using a randomized complete block design (RCBD) with four replications in six growing periods (20 Apr, 25 May, 30 June, 5 Oct, 10 Nov and 15 Dec 2015-2016) at Khon Kaen, Thailand. Soil properties were determined prior to planting, and crop traits and weather data were recorded. The six planting dates had a statistically significant effect on all crop traits. Low temperatures and solar radiation related to low biomass accumulation rates and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Climatic factors; Environment; Growth analysis; Growing date.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162019001500376

Performance of Holstein cows fed sugarcane or corn silages of different grain textures
Provedor de dados: 63
Autores: Corrêa,Clóvis Eduardo Sidnei; Pereira,Marcos Neves; Oliveira,Simone Gisele de; Ramos,Marcelo Hentz.
Corn cultivated in Brazil is predominantly of hard texture, and more propense to decreased starch digestibility under late harvesting situations than dent hybrids. This work tested the utilization of dent corn as a way of extending the ensilage period without reducing animal performance, and evaluated the potential of sugarcane as a forage for high-producing dairy cows. Nine lactating Holstein cows were allocated to three 3 ' 3 latin squares and were fed 200 g of forage neutral detergent fiber per kg of dry matter as either hard texture corn ensiled at the half milk line stage of maturity, soft texture corn ensiled at the black layer stage, or sugarcane. There were no detectable differences between corn hybrids with regard to milk yield (34.2 vs 34.6 kg...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Flint corn; Dent corn; Digestibility; Stage of maturity.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000400003

Errata
Provedor de dados: 63
Tipo: Info:eu-repo/semantics/article
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000100033

Toxicidade de sementes de fedegoso (Cassia occidentalis L.) para frangos de corte
Provedor de dados: 63
Autores: Gonzales,E.; Butolo,J.E.; Silva,R.D. de M. e; Packer,I.U.; Lamas da Silva,J.M.
Foram realizados três ensaios com o objetivo de se determinar o nível de toxicidade da contaminação de sementes de Cassia occidentalis na alimentação de frangos de corte. Nos dois primeiros ensaios foram utilizadas 640 aves de 1 dia de idade. Os níveis de adição da semente no primeiro ensaio foram, 0; 2; 4 e 6%, obtendo-se 5,77; 84,62; 100 e 100% de mortalidade, respectivamente. No segundo ensaio, os níveis utilizados foram 0; 0,5; 1 e 2%, obtendo-se 0; 3,29; 15,73 e 89,47% de mortalidade, respectivamente. No terceiro ensaio, utilizou-se 960 aves de 3 dias de idade. Adicionou-se a ração inicial (4-31 dias de idade) e final (32-52 dias) sementes moídas de fedegoso aos níveis de 0; 0,1; 0,2; 0,3; 0,4 e 0,5%. O peso médio final das aves foi 2,01; 1,95; 1,95;...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Frangos de corte; Toxicidade; Cassia occidentalis L.; Fedegoso.
Ano: 1994
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000100024

Sodium-affected alfisols of the agreste region, state of Paraíba, Brazil, as known by potter-farmers and agronomists
Provedor de dados: 63
Autores: Alves,Ângelo Giuseppe Chaves; Silva,Ivandro de França da; Queiroz,Sandra Barreto de; Ribeiro,Mateus Rosas.
Decisions and practical attitudes of land use and management adopted by rural populations are, to a great extent, based on local soil knowledge. This study was performed to describe and analyze chemical, physical and morphological characteristics of sodium-affected Alfisols employed in traditional pottery; and to compare, through statistical analysis, pedogenetical horizons and soil layers, as recognized in soil profiles by professional researchers and potter-farmers, respectively. Fieldwork was performed in Chã da Pia, a rural village in the municipality of Areia, in the Agreste region of the State of Paraíba, Northeast Brazil. Ethnoscientific techniques were used to describe and analyze soil knowledge of potter-farmers who played the role of informants....
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Ethnopedology; Discriminant-canonical analysis; Pottery; Local knowledge.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000500007

Erratum
Provedor de dados: 63
Tipo: Info:eu-repo/semantics/other
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000200019

Curvas de secagem de sementes de milho utilizando o método intermitente
Provedor de dados: 63
Autores: Villela,F.A.; Silva,W.R. da.
O presente trabalho teve por objetivo determinar as curvas de secagem de sementes de milho, para diferentes temperaturas do ar, durante a secagem intermitente. Foram utilizados três lotes de sementes de milho do hibrido duplo AG-162 e um secador marca D'Andréa, modelo D-200. As temperaturas do ar de secagem empregadas foram de 70, 80 e 90°C. As seguintes determinações foram realizadas: teor de água das sementes, temperatura do ar de secagem, temperaturas da massa de sementes na câmara de secagem e na saída do secador, umidade relativa do ar e temperatura do ar ambiente. Considerando temperaturas do ar de secagem de 70, 80 e 90°C e reduções do teor de água de 16,5% para 13,0%, os resultados permitem as seguintes conclusões: a) as curvas de secagem de...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Secagem; Curvas de secagem; Milho.
Ano: 1992
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161992000400019

Intelligent instrument to facilitate decision making in the evaluation of soil resistance to root penetration
Provedor de dados: 63
Autores: Rabello,Ladislau Marcelino; Cruvinel,Paulo Estevão.
This contribution introduces an instrument for decision-making in agricultural processes based on the measurements and mapping of soil resistance to root penetration. Its development was based on a new and advanced instrumentation tool, enabling in almost real-time to acquire the necessary information for spatial variability analysis of plant root penetration resistance in soils, due to natural or artificial soil compaction processes, i.e., not only for an area of soil but also for a soil profile. The system allows soil resistance assays for both laboratory and agricultural fields. Moreover, the development focused on an intelligent instrumentation concept, as well as a microprobe (30º for the spire angle, 1,6 mm for the base diameter, and 30 mm of total...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Agricultural instrumentation; Intelligent systems; Signal processing; Soil microprobe; Soil penetrometer.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000500001

Evaluation of the protective capacity of new mild Citrus tristeza virus (CTV) isolates selected for a preimmunization program
Provedor de dados: 63
Autores: Zanutto,Carlos Alexandre; Corazza,Maria Júlia; Nunes,William Mário de Carvalho; Müller,Gerd Walter.
The use of tolerant rootstocks and preimmunization has satisfactorily controlled losses associated with the Citrus tristeza virus (CTV). Several researchers have shown that CTV mild isolates that are selected in the same region where they are used are superior to isolates obtained from other areas. Thus, budwoods of 20 outstanding citrus trees were collected in north and northwestern Paraná state (Brazil) citrus-producing areas and established to be used in a preimmunization program. These budwoods were tested to evaluate the potential protection of the inherently present viral complex. Based on biological indexing and molecular characterization of the capsid protein gene by RFLP (restriction fragment length polymorphism, which indicated that the plants...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: SSCP; RFLP; Cross-protection; Citrus.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162013000200009

Aerofotos convencionais e imagens orbitais TM/LANDSAT no mapeamento morfopedológico em Santa Bárbara D'Oeste (SP)
Provedor de dados: 63
Autores: Demattê,J.A.M.; Borges,M.H.; Pfeifer,R.M.
Foram estudados, com o auxílio de fotografias aéreas, aspectos qualitativos e quantitativos do relevo e da rede de drenagem de solos de uma área de Santa Bárbara D'Oeste, SP. Esta região compreende 14.625 ha, onde foram selecionadas bacias hidrográficas de 3ª ordem de ramificação e amostras circulares de 5km². As unidades de mapeamento simples ou associações de solos são: Latossolo Vermelho Escuro, Podzólico, Litossolo + Podzólico, Terra Roxa Estruturada + Latossolo Roxo distrófico. Após a caracterização das feições fisiográficas, da área de ocorrência desses solos, foram realizados dois mapas morfopedológicos. No primeiro utilizou-se fotografias aéreas verticais pancromáticas na escala 1: 35.000 (data de 25/6/78) e no segundo imagens orbitais do sensor...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mapeamento de solos; Fotografias aéreas; LANDSAT; Caracterização fisiográfíca.
Ano: 1993
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161993000300009

Alcobaça allele and genotypic backgrounds affect yield and fruit shelf life of tomato hybrids
Provedor de dados: 63
Autores: Dias,Túlio José Mendes; Maluf,Wilson Roberto; Faria,Marcos Ventura; Freitas,Joelson André de; Gomes,Luiz Antonio Augusto; Resende,Juliano Tadeu Vilela; Azevedo,Sebastião Márcio de.
Post-harvest shelf life of tomato fruit may be increased by deploying mutant alleles which affect the natural ripening process and/or by a favorable genotypic background. Among the several ripening mutant genes, alcobaça (alc) has proved to be highly efficient in increasing shelf life of commercial tomato fruits, especially in heterozygosis, a state at which no limiting deleterious effects upon fruit color occur. The effects of heterozygosity in the alcobaça locus (alc+/alc) on yield and fruit quality traits of tomato hybrids with three genotypic backgrounds. We evaluated three pairs of hybrids obtained from crosses between the near-isogenic pollen source lines Flora-Dade (alc+/alc+) and TOM-559 (alc/alc), and three maternal lines (Stevens, NC-8276 and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lycopersicon esculentum; Alcobaça; Ripening mutant; Long shelf-life.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000200010

Qualidade fisiológica de sementes de pimentão
Provedor de dados: 63
Autores: Torres,Salvador Barros; Minami,Keigo.
O objetivo deste trabalho foi avaliar a eficácia de diferentes métodos para a determinação da qualidade fisiológica de sementes de pimentão (Capsicum annuum L.), cv. All Big, procurando obter informações que possam indicar opções de utilização nos programas de controle de qualidade, bem como tornar possível, através de testes de laboratório, a identificação do potencial de emergência das plântulas em campo. Para tanto, foram avaliadas sementes de quatro lotes, pelos testes de germinação, primeira contagem de germinação, condutividade elétrica após quatro e 24 horas, envelhecimento acelerado, frio em rolo de papel sem solo, emergência das plântulas em campo e grau de umidade. Os resultados indicaram que os testes de primeira contagem de germinação,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Capsicum annuum; Germinação; Vigor.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000100018

Seasonal fluctuations of bacterial population and microbial activity in soils cultivated with eucalyptus and pinus
Provedor de dados: 63
Autores: Rigobelo,Everlon Cid; Nahas,Ely.
The accumulation and decomposition of litter in soils under forests depend on climatic and biotic conditions. This work evaluated the effect of monthly rainfall and temperature on total bacteria, and on the dehydrogenase and respiration microbial activities. The effects of organic matter, total organic C and soil moisture were also evaluated. Performed from April, 1999 to March, 2000 in an Eucalyptus-cultivated and Pinus-cultivated Oxisol (Typic Haplustox), the study showed that climate and the soil variables affect the total number of bacteria and the microbial activities. The highest air temperatures and rainfall intensities were found during the Summer and, consequently, all the studied variables were maximal during this period. Minimal values varied...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: MPN; Dehydrogenase; Microbial respiration; Litter; Temperature.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000100015

Detection of differentially methylated regions of irradiated fig tree selections
Provedor de dados: 63
Autores: Rodrigues,Maria Gabriela Fontanetti; Soares,Murilo Racy; Gimenez,Daniele Fernanda Jovino; Fonseca,Larissa Fernanda Simielli; Torrieri,Erico; Ramos,Ester Silveira; Giuliatti,Silvana.
ABSTRACT Fig tree (Ficus carica L.) breeding programs using conventional methods, such as directed crosses, to obtain new cultivars, are unworkable in many countries, including Brazil. Consequently, genetic breeding through mutagenesis has emerged as an important line of research that can improve this crop, and be a significant source of information about this species and assist in the implementation of propagation projects and appropriate management. The aim of this study was to verify the existence of epigenetic variability attributable to DNA methylation in irradiated fig selections when compared both to each other and to the main commercial cultivar, “Roxo-de-Valinhos”, which had previously used methylation-sensitive amplified polymorphism (MSAP) and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ficus carica; DMRs; Methylation; Plant breeding; Epigenetics.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162017000400285

CSM-CERES-Rice model to determine management strategies for lowland rice production
Provedor de dados: 63
Autores: Vilayvong,Saythong; Banterng,Poramate; Patanothai,Aran; Pannangpetch,Krirk.
The cropping system model, namely, the crop environment resource synthesis-rice (CSM-CERES-Rice) model, is a decision supporting tool for the design of crop management. This study aimed to determine management practices for increasing rice (Oryza sativa L.) production in Laos by using the CSM-CERES-Rice model. The model was evaluated with data sets from the TDK8 and TDK11 cultivars in farmers’ fields in the Vientiane plain in 2012. Anthesis and harvesting dates, growth and yield for various management scenario combinations (eight transplanting dates × two levels of plant densities × three rates of nitrogen (N) fertilizer application) for both cultivars were simulated by the model from 1980 to 2012. The model evaluation results showed strong agreement...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Crop simulation; N-fertilizer application; Planting practice; Transplanting date.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162015000300229

Droplet deposition during spray and leaf pH in aquatic weed control
Provedor de dados: 63
Autores: Costa,Neumárcio Vilanova da; Martins,Dagoberto; Rodella,Roberto Antonio; Costa,Lívia Duarte Neves de Camargo da.
The morphological diversity of leaf surface and structures such as trichomes, stomata, cuticle, and waxes that exists among plant species can have great influence on the adherence and deposition of spray droplets, as well as on herbicide absorption. The aim of this research was to study leaf pH and to evaluate wetting areas after applications of solution surfactants on the following aquatic weeds: Enhydra anagallis, Eichhornia crassipes, Heteranthera reniformis, and Typha subulata. The aquatic weeds were grown in reservoirs containing water under open air conditions and their leaf tissues were collected when the plants reached full development (before flowering). The mean leaf pH varied between 5.50 and 7.50; E. anagallis should be pointed out for...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aquatic weed; Glyphosate; Surface tension; Wetting.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000300005

Nitric oxide in plants: a brief discussion on this multifunctional molecule
Provedor de dados: 63
Autores: Ferreira,Leonardo Cesar; Cataneo,Ana Catarina.
Several studies were carried out in order to improve the knowledge about the occurrence and activity of nitric oxide (NO) in plants. Thus, this review discusses some aspects related to NO in plants such as chemical properties, synthesis pathways, physiological effects, antioxidant action, signal transduction, interaction with plant hormones and gene expression. In the last years, many advances have been obtained regarding NO synthesis and its physiological effects in plants. However, the molecular mechanisms underlying its effects remain poorly understood. It is signalized that tight interplays among NO, Ca2+, cyclic ADP ribose (cADPR), and protein kinases need to be investigated in details. In addition, it has not yet been possible to identify a plant...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Pathogenesis; Plant hormones; Plant signal transduction; Reactive oxygen species.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000200017

Organic and conventional tomato cropping systems
Provedor de dados: 63
Autores: Bettiol,Wagner; Ghini,Raquel; Galvão,José Abrahão Haddad; Siloto,Romildo Cássio.
Among several alternative agricultural systems have been developed, organic agriculture has deserved increasing interest from. The objective of this paper was comparing both organic (OS) and conventional (CS) tomato cropping systems for varieties Débora and Santa Clara, through an interdisciplinary study. The experiment was set up in a randomized blocks design with six replicates, in a dystrophic Ultisol plots measuring 25 ´ 17 m. Cropping procedures followed by either local conventional or organic growers practices recommendations. Fertilization in the OS was done with organic compost, single superphosphate, dolomitic limes (5L, 60 g, and 60 g per pit), and sprayed twice a week with biofertilizer. Fertilization in the CS was done with 200 g 4-14-8 (NPK)...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lycopersicum esculentum; Alternative agriculture; Biological control.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000300002

Soil-water-plant relationship and fruit yield under partial root-zone drying irrigation on banana crop
Provedor de dados: 63
Autores: Coelho,Eugênio Ferreira; Santos,Marcelo Rocha dos; Donato,Sérgio Luíz Rodrigues; Cruz,Jailson Lopes; Oliveira,Polyanna Mara de; Castricini,Ariane.
ABSTRACT: Climatic uncertainties have compromised water resources, which influences irrigated agriculture. Irrigation is an important alternative to mitigate the effects of water scarcity. Partial root-zone drying (PRD) is a rational use of irrigation water. This study aimed to evaluate PRD for irrigation management of banana crop, cv BRS Princesa, under semi-arid conditions in Brazil. A field experiment was carried out with five treatments: one control (full irrigation) and four with 50 % reduction of water irrigation depth (WID) and frequencies alternating the side to be irrigated of the plant row of 0, 7, 14 and 21 days. Stomatal conductance, growth, yield and soil water status were evaluated. Results indicated that banana crop cv. BRS Princesa shows...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Musa spp.; Water use efficiency; Vapor pressure deficit; Irrigation deficit.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162019001500362

Silicon sources for rice crop
Provedor de dados: 63
Autores: Pereira,Hamilton Seron; Korndörfer,Gaspar Henrique; Vidal,Anelisa de Aquino; Camargo,Mônica Sartori de.
Although silicon is not an essential nutrient, its application is beneficial for plant growth and development. To evaluate silicon sources in relation to agronomic efficiency and economic viability in rice crops (Oryza sativa L.), a greenhouse experiment was conducted, Quartzipsamment soil, in a completely randomized experimental design (n = 4). Treatments were 12 silicon sources and a control. Silicon was applied at the rate of 125 kg Si ha-1. Data were compared to a standard response curve for Si using the standard source Wollastonite at rates of 0, 125, 250, 375, and 500 kg Si ha-1. All treatments received CaCO3 and MgCO3 to balance pH, Ca and Mg. One hundred and fifty days after sowing, evaluations on dry matter yield in the above-ground part of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Slag; Metallurgical aggregate; Silicate; Oryza.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000500010

Molecular confirmation of Maize rayado fino virus as the Brazilian corn streak virus
Provedor de dados: 63
Autores: Hammond,Rosemarie Wahnbaeck; Bedendo,Ivan Paulo.
Maize rayado fino virus (MRFV), present in various countries in Latin America, has shown similarities to corn streak virus that occurs in Brazil, regarding pathogenic, serological and histological characteristics. In the current report both virus were molecularly compared to confirm the similarities between them. MRFV was identified by nucleic acid hybridization in samples of maize tissues exhibiting symptoms of "corn stunt" disease, collected from two Brazilian States - São Paulo and Minas Gerais. The coat protein gene and 3'non-translated region of MRFV were amplified from infected tissues by reverse transcription-polymerase chain reaction (RT-PCR) using MRFV-specific primers, and were characterized by nucleotide sequence and phylogenetic analysis of the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: MRF virus; Corn viruses; Phytoplasma; Corn stunt.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000600015

Growth retardants on development and ornamental quality of potted 'Lilliput' Zinnia elegans Jacq.
Provedor de dados: 63
Autores: Pinto,Ana Christina Rossini; Rodrigues,Teresinha de Jesus Deléo; Leite,Izabel Cristina; Barbosa,José Carlos.
Zinnias have good potential to be used as flowering, potted plants, being a quick source of novelty for the floriculture industry with the aid of growth retardants. This study evaluated the effect of growth retardants on development and production of short, compact and attractive plants of potted 'Lilliput' Zinnia elegans, a highly ornamental zinnia with low cost seeds. Trials were set up in randomized blocks, with ten treatments (control and three treatments of each retardant: daminozide, paclobutrazol and chlormequat) and four replications (two pots per experimental unit, with one plant per 0.6-L pot). Paclobutrazol (0.5, 0.75 and 1.0 mg a.i. per pot) and chlormequat (1.0, 2.0 and 3.0 g L-1) were applied as a single drench (40 mL per pot), and daminozide...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Floriculture; Daminozide; Paclobutrazol; Chlormequat; Flowering.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000400006

POLIAMINAS E ATIVIDADE DA PEROXIDASE EM FEIJÃO (Phaseolus vulgaris L.) CULTIVADO SOB ESTRESSE SALINO
Provedor de dados: 63
Autores: Lima,Giuseppina Pace Pereira; Brasil,Oswaldo Galvão; Oliveira,Antonio Marinho de.
O teor de poliaminas (putrescina, espermidina e espermina) e a atividade enzimática da peroxidase (EC 1.11.1.7) foram determinados em plantas de Phaseolus vulgaris L. cv Carioquinha, após terem sido submetidas a estresse salino (50 e 100 mM de NaCl). Foram observadas alterações nos teores das poliaminas, principalmente putrescina, que aumentou com o tempo e a concentração de NaCl. Também ocorreu aumento na atividade da peroxidase em ambas concentrações de NaCl utilizadas. Os resultados mostraram alterações no metabolismo de poliaminas e peroxidases nas plantas de feijão cultivadas em meio salino.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Poliaminas; Peroxidase; Feijão; NaCl.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000100004

Field determined variation of the unsaturated hydraulic conductivity functions using simplified analysis of internal drainage experiments
Provedor de dados: 63
Autores: Villagra,M. M.; Michiels,P.; Hartmann,R.; Bacchi,O.O.S.; Reichardt,K.
Experimentally determined values of unsaturated soil hydraulic conductivity are presented for an Alfisol of the county of Piracicaba, S.P., Brazil. Simultaneous measurements of soil water content and pressure head are made along a 125 m transect within an irrigated field during the internal drainage process. Calculations of the soil hydraulic conductivity were made using the instantaneous profile method (Watson, 1966) and the unit gradient method (LIBARDI et al., 1980). The spatial variability of the soil hydraulic conductivity manifested along the transect indicates the need to develop a field method to measure K(theta) within prescribed fiducial limits, taking into account quantitative evaluation of spatial and temporal variances associated with the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil variability; Hydraulic conductivity.
Ano: 1994
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000100018

Copper and zinc quantification in contaminated soil as evaluated by chemical extractants
Provedor de dados: 63
Autores: Silva,Maria Ligia de Souza; Trevizam,Anderson Ricardo; Vitti,Godofredo César.
Trace elements are potentially toxic to the environment. Their toxicity in soils relies on their type of chemical associations. Hence it is important to determine the chemical form they occur in the soils in order to assess their quantities. The objective the present work was to evaluate the possibility of using the concentrations of Cu and Zn in different soil fractions and the total concentration as predictors of their quantification by comparing the classical extractants DTPA, Mehlich-1 and HCl. Comparisons were made also with the concentrations of absorbed by rice and soybean in contaminated soil. Seven soil samples with a different degree of contamination were studied using a randomized experimental design, with four replicates. By using an ICP-OES we...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: DTPA; HCl; Crops; Mehlich-1; Sequential extraction.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000600015

Compatibility and incompatibility in hyphal anastomosis of arbuscular mycorrhizal fungi
Provedor de dados: 63
Autores: Novais,Candido Barreto de; Pepe,Alessandra; Siqueira,José Oswaldo; Giovannetti,Manuela; Sbrana,Cristiana.
ABSTRACT: Arbuscular mycorrhizal fungi (AMF), which live in symbiosis with 80 % of plants, are not able to grow when separated from their hosts. Spore germination is not host-regulated and germling growth is shortly arrested in the absence of host roots. Germling survival chances may be increased by hyphal fusions (anastomoses), which allow access to nutrients flowing in the extraradical mycelium (ERM). Perfect anastomoses, occurring with high frequency among germlings and the ERM of the same isolate, show protoplasm continuity and disappearance of hyphal walls. A low frequency of perfect fusions has been detected among co-specific genetically different isolates, although fungal nuclei have been consistently detected in all perfect fusions, suggesting...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glomeromycota; Hyphal fusions; Incompatible hyphal interactions; Protoplasmic flow; Nuclear migration.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162017000500411

Plant proton pumps as markers of biostimulant action
Provedor de dados: 63
Autores: Zandonadi,Daniel Basílio; Santos,Mirella Pupo; Caixeta,Lisanne Santos; Marinho,Eduardo Barros; Peres,Lázaro Eustáquio Pereira; Façanha,Arnoldo Rocha.
ABSTRACT A standard protocol to evaluate the effects of biostimulants on plant physiology is still lacking. The proton pumps present in the vacuolar and plasma membranes are the primary agents responsible for the regulation of the electrochemical gradient that energizes the nutrient uptake system and acid growth mechanism of plant cells. In this study, two of these enzymes were characterized as biochemical markers of biostimulant activity. A simple and fast protocol based on the degree of root acidification using a pH sensitive dye and the Micro-Tom tomato as a plant model is proposed as an efficient methodology to prove the efficacy of biostimulants that are claimed to improve nutrient acquisition and root growth. The results agree with the data from more...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Micro-Tom; Acidification; Auxin; Rhizosphere; Bromocresol.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000100024

Soil compaction on traffic lane due to soil tillage and sugarcane mechanical harvesting operations
Provedor de dados: 63
Autores: Júnnyor,Wellingthon da Silva Guimarães; Maria,Isabella Clerici De; Araujo-Junior,Cezar Francisco; Lima,Camila Cassante de; Vitti,André César; Figueiredo,Getulio Coutinho; Dechen,Sonia Carmela Falci.
ABSTRACT: Mechanical sugarcane harvesting increases soil compaction due to the intense traffic of agricultural machinery, reducing longevity of sugarcane crops. In order to mitigate the harmful effects caused by agricultural traffic on the soil structure in sugarcane fields, this study evaluated impacts of mechanical sugarcane harvesting on traffic lane under two soil tillage systems based on load bearing capacity models. The experiment was carried out in the region of Piracicaba, state of São Paulo, Brazil, on a Rhodic Nitisol, under conventional tillage (CT) and deep strip-tillage (DST). For CT soil tillage was applied to the entire area with a heavy disk harrow, at operating depths from 0.20 to 0.30 m followed by a leveling harrow at a depth of 0.15 m....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Load bearing capacity; Soil stress distribution; Preconsolidation pressure; Modeling; Environmental sustainability.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162019001600509

Editorial
Provedor de dados: 63
Autores: Reichardt,Klaus.
Tipo: Info:eu-repo/semantics/other
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000100001

Using genealogy to improve selection efficiency of pedigree method
Provedor de dados: 63
Autores: Nunes,José Airton Rodrigues; Moreto,Alexsander Luís; Ramalho,Magno Antonio Patto.
In the pedigree method of conducting an autogamous population of segregating plants, the genealogy of the progenies is registered. Although labor-intensive, these data are rarely used. One possibility of exploiting this information is to improve selection efficiency using BLUP (Best Linear Unbiased Prediction). In this study BLUP with genealogy inclusion was compared to the mean in the progenies evaluation conducted by the pedigree method. Progenies of crosses of the common bean lines BRS MG Talismã and BRS Valente in F4:6 and F4:7 were used. The 256 F4:6 progenies were sown in February 2005, in southeast of Brazil, in a 16 &lt;FONT FACE=Symbol&gt;´&lt;/FONT&gt; 16 simple lattice design. The grain yield data were subjected to BLUP analysis with inclusion...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: BLUP; Selection method; Bean improvement; Heritability; Quantitative genetics.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000100004

Soil spiders (Arachnida: Araneae) in native and reforested Araucaria forests
Provedor de dados: 63
Autores: Pereira,Jamil de Morais; Cardoso,Elke Jurandy Bran Nogueira; Brescovit,Antonio Domingos; Oliveira Filho,Luís Carlos Iuñes de; Segat,Julia Corá; Baretta,Carolina Riviera Duarte Maluche; Baretta,Dilmar.
ABSTRACT: Spiders are part of the soil biodiversity, considered fundamental to the food chain hierarchy, directly and indirectly influencing several services in agricultural and forest ecosystems. The present study aimed to evaluate the biodiversity of soil spider families and identify which soil properties influence their presence, as well as proposing families as potential bioindicators. Native forest (NF) and reforested sites (RF) with Araucaria angustifolia (Bertol.) Kuntze were evaluated in three regions of the state São Paulo, both in the winter and summer. Fifteen soil samples were collected from each forest to evaluate the biological (spiders and microbiological), chemical and physical soil properties, in addition to properties of the litter (dry...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Spider fauna; Soil biodiversity; Soil properties; Soil quality.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000300701

'Valencia' sweet orange tree flowering evaluation under field conditions
Provedor de dados: 63
Autores: Ribeiro,Rafael Vasconcelos; Rolim,Glauco de Souza; Azevedo,Fernando Alves de; Machado,Eduardo Caruso.
Since citrus flowering is a key process in citriculture and its evaluation is often difficult due to the canopy structure and field sampling, the aim of this research was to give some directions regarding the evaluation of flowering in field-grown sweet orange plants. This study was conducted in a citrus orchard of sweet orange plants cv. 'Valencia' [Citrus sinensis (L.) Osbeck] grafted on 'Cleopatra' mandarin (Citrus reshni hort. ex Tanaka) or 'Rangpur' lime (Citrus limonia Osbeck) rootstocks, with North-South orientation. Generative structures [buds, flowers and fruitlets (diameter &lt; 3 cm)] were quantified weekly between August and November 2005, by using a 1 m² frame positioned at the middle third of plant canopy, sampling a volume of about 1 m³....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Citrus spp.; Bloom; Method; Sampling.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000400010

SISTEMA POLIVALENTE DE ANÁLISES QUÍMICAS  POR INJEÇÃO EM FLUXO: DETERMINAÇÃO ESPECTROFOTOMÉTRICA DE CÁLCIO, MAGNÉSIO E FÓSFORO EM PLANTAS
Provedor de dados: 63
Autores: Nogueira,A.R. de A.; Souza,G.B. de; Silva,F.V. da; Zagatto,E.A.G.
Um sistema polivalente de análises químicas por injeção em fluxo foi proposto para a determinação de cálcio, magnésio e fósforo em digeridos ácidos de plantas. O-cresolphtaleina complexona (CPC) foi selecionado como reagente colorimétrico para a determinação de cálcio e magnésio e molibdato de amônio/vanadato de amônio para a determinação de fósforo. O sistema empregou tampão amônio-amônia (pH 10,5) e EGTA ou 8-hidroxiquinolina como agentes mascarantes para cálcio ou magnésio, respectivamente. Equações de calibração lineares foram obtidas, sendo que para facilitar a utilização do sistema proposto, foi utilizada curva analítica mista (até 40,0 mg Ca L-1, 10,0 mg Mg L-1 e 16,0 mg P L-1), não sendo observadas interferências entre os elementos. Os limites de...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Análise por injeção em fluxo; Cálcio; Magnésio; Fósforo; Plantas.
Ano: 1997
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161997000200016

Atração e desenvolvimento de Leptoglossus gonagra (Fabr.) (Hemiptera: Coreidae) em cultivares de abóbora e moranga
Provedor de dados: 63
Autores: Baldin,Edson Luiz Lopes; Caetano,Antonio Cesar; Lara,Fernando Mesquita.
As plantas da família Cucurbitaceae são seriamente prejudicadas pelo ataque de insetos, sendo que os danos ocorrem desde a germinação até a colheita e podem ser observados em todas as partes da planta. Dentre os insetos sugadores que atacam a abóbora (Cucurbita moschata) e a moranga (C. maxima), as formas jovens e adultas do percevejo Leptoglossus gonagra (Fabr.) (Hemiptera: Coreidae) merecem destaque por sugarem a seiva das folhas, ramos e frutos novos, nos quais causam necroses, reduzindo a produção. Visando comparar a atratividade de plântulas de cultivares de abóbora e moranga a adultos deste percevejo e os efeitos desses materiais sobre a biologia de ninfas dessa espécie, realizaram-se ensaios sob condições de laboratório. Em teste de atratividade, o...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Insecta; Resistência de plantas; Plântulas; Atratividade; Antibiose.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000100028

Spray deposition and losses in potato as a function of air-assistance and sprayer boom angle
Provedor de dados: 63
Autores: Scudeler,Fábio; Raetano,Carlos Gilberto.
Within the Brazilian agricultural scene, the potato crop plays a significant economic role. Modern equipment and the development of improved chemical product application techniques contribute toward the constant search for improved revenue from the potato as a crop. Field experiments were carried out in a random block design of a potato crop of the "Ágata" variety. The aim was to evaluate the effect of air assistance combined to different angles of spray application on the chemical deposition on the potato plant, as well as to assess spray losses to the soil. For this a sprayer with and without boom air assistance was used in the experiments. Boom angles of 0º, +30º and -30º were directed to a vertical position as well as forward and backward movements....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Solanum tuberosum; Application technology; Sleeve boom sprayer; Spray.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000600001

Xaraés palisadegrass remains productive after the disappearance of stylo in tropical legume-grass pasture
Provedor de dados: 63
Autores: Menezes,Rodrigo Carvalho; Alves,Eveline Bueno; Casagrande,Daniel Rume; Lara,Márcio André Stefanelli; Evangelista,Antônio Ricardo; Bernardes,Thiago Fernandes.
Gradual reduction of legumes in mixed tropical pastures requires periodic oversowing. Exploiting the carrying capacity of grass for an extra year after the disappearance of legumes can be economically advantageous to the farmer. This study aimed to evaluate the productivity of Xaraés palisadegrass (Brachiaria brizantha) pastures in response to its historical association with stylo (Stylosanthes guianensis) under two canopy heights to determine whether different grazing management conditions affect the defoliation pattern left by grazing animals. The split-plot experimental design was used, with the historical botanical composition (HBC) (24, 34, 45 and 52 % legume composition) corresponding to the main plots and the canopy frequency of defoliation...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brachiaria brizantha; Stylosanthes guianensis; Mixed pastures; Animal behavior.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162015000600484

BALANÇO HÍDRICO EM CULTURA DE AVEIA FORRAGEIRA DE INVERNO NA REGIÃO DE SÃO CARLOS-SP
Provedor de dados: 63
Autores: BACCHI,O.O.S; GODOY,R; FANTE Jr,L; REICHARDT,K.
O trabalho trata da determinação do balanço hídrico de uma cultura de aveia forrageira de inverno (variedade São Carlos), cultivada sob condições de irrigação por aspersão, com o objetivo de obter informações básicas sobre seu comportamento sob regime de irrigação e de sua demanda hídrica para a região de São Carlos, SP. Os resultados de produtividade da cultura e dos balanços hídricos sob duas condições de disponibilidade hídrica no solo dão indicações de que o menor nível de disponibilidade de água no solo, correspondente a um potencial mátrico mínimo de -20Kpa à 20cm de profundidade, já é suficientemente satisfatório para garantir as máximas produtividades da cultura nas condições locais de solo e clima.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Balanço hídrico; Evapotranspiração; Aveia forrageira; Aveia; Avena byzantina.
Ano: 1996
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161996000100025

TRATAMENTO DE SEMENTES DE ARROZ, TRIGO, FEIJÃO E SOJA COM UM PRODUTO FORMULADO À BASE DE CÉLULAS E DE METABÓLITOS DE Bacillus subtilis
Provedor de dados: 63
Autores: LAZZARETTI,E; BETTIOL,W.
Um produto constituido de pó-molhável (PBBS) formulado à base de células (60g) e de metabólitos (60g) de Bacillus subtilis, argila (480g), espalhante (7,92g) e água (2400ml), moído e seco, mostrou-se semelhante aos tratamentos com fungicidas recomendados para o controle de Rhizoctonia solani, Aspergillus sp. e Sclerotinia sclerotiorum em sementes de feijão; Pyricularia oryzae e Rhinchosporium sativum em sementes de arroz; e Cercospora kikuchii, Phomopsis phaseoli e Fusarium spp. em sementes de soja. Para Dreschlera oryzae em arroz e Bipolaris sorokiniana, P. oryzae e Alternaria tenuis em sementes de trigo, o tratamento com o PBBS, embora não tenha se igualado ao tratamento com o fungicida padrão, diferiu estatisticamente do tratamento testemunha. A...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Controle biológico; Microbiolização de sementes; Patologia de sementes; Arroz; Feijão; Soja; Trigo.
Ano: 1997
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161997000100013

Nitrogen loss in Brachiaria decumbens after application of glyphosate or glufosinate-ammonium
Provedor de dados: 63
Autores: Damin,Virginia; Franco,Henrique Coutinho Junqueira; Moraes,Milton Ferreira; Franco,Ademir; Trivelin,Paulo Cesar Ocheuze.
Nitrogen losses from the soil-plant system may be influenced by herbicide applications. In order to evaluate N loss in brachiaria (Brachiaria decumbens) after application of the herbicides glyphosate and glufosinate-ammonium, an experiment was carried out in a greenhouse as a completely randomized design, with three treatments and six replicates. Treatments were as follows: i) desiccation of brachiaria-plants with glyphosate; ii) desiccation of brachiaria-plants with glufosinate-ammonium; and iii) control, without herbicide application. The plants were cultivated in 4 kg pots of sandy soil and fertilized with ammonium sulfate- 15N, (200 mg kg-1) in order to quantify the allocation of the fertilizer-N and its recovery in the soil-plant system. Plants...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: 15N; Ammonium exchange; Gramineae; Herbicides.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000400012

Inibição da colonização por Bradyrhizobium elkanii mas não por Glomus intraradices em soja pelo ativador de defesa vegetal BTH
Provedor de dados: 63
Autores: Hoffmann,Lúcia Vieira; Cardoso,Elke Jurandy Bran Nogueira.
O produto BTH controla doenças através da ativação dos mecanismos de resistência de plantas, cujo modo de ação tem sido caracterizado através da identificação de genes ou enzimas ativados durante esta reação. Os mesmos genes e enzimas podem ser ativados como parte da reação das plantas à colonização por microssimbiontes mutualistas. Então, a aplicação de BTH pode inibir também essas simbioses. Um experimento foi conduzido para verificar se BTH tem efeito sobre a colonização de raízes de soja pelos microssimbiontes Glomus intraradices e Bradyrhizobium elkanii. Plantas controle ou inoculadas com o fungo micorrízico ou rizóbio foram tratadas com 20 mL de BTH 25 mg L-1 por meio da aplicação em sementes, via radicular ou via foliar. As plantas que receberam...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Micorriza; Rizóbio; Resistência sistêmica adquirida.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000400022

Fertilização potássica na cultura do alho vernalizado
Provedor de dados: 63
Autores: Büll,Leonardo Theodoro; Villas Bôas,Roberto Lyra; Fernandes,Dirceu Maximino; Bertani,Rosemary Marques Almeida.
O objetivo do presente trabalho foi verificar a validade do parcelamento da adubação potássica, bem como a época mais adequada de aplicação, no controle do superbrotamento e no desenvolvimento e produção de bulbos na cultura do alho vernalizado (cv. Roxo Pérola de Caçador). Foram instalados dois experimentos em estufa agrícola, em vasos de cimento amianto com capacidade para 55 L de terra. O experimento 1 consistiu de sete épocas de aplicação da metade da dose de potássio necessária para a cultura, aos 50, 60, 70, 81, 91, 101 e 111 dias após a emergência (dae), sendo que o experimento 2 consistiu da aplicação de quatro doses de potássio no plantio combinadas a outras quatro em cobertura, aos 81 dae. O parcelamento da adubação potássica em diferentes...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Alho; Adubação potássica.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000100024

Melhoramento do maracujazeiro-amarelo: obtenção do cultivar 'COMPOSTO IAC-27'
Provedor de dados: 63
Autores: Meletti,Laura Maria Molina; Santos,Rui Ribeiro dos; Minami,Keigo.
Este experimento foi conduzido em Monte Alegre do Sul, SP, de 1995 a 1997, com o objetivo de se obter um cultivar de maracujá amarelo, homogêneo quanto à qualidade de fruto, de alta produtividade e bem aceito pelo mercado. Estudou-se o comportamento de 8 híbridos, obtidos em sucessivos ciclos de seleção recorrente, a partir de indivíduos pré-selecionados em pomares comerciais ou bancos de germoplasma. Foram avaliados desenvolvimento vegetativo, tipos de flores, período de florescimento e frutificação e produtividade. A análise qualitativa dos frutos incluiu peso, diâmetro longitudinal e transversal dos frutos; proporção da polpa e sua coloração, teor de sólidos solúveis totais (SST), número de sementes e classificação comercial. A melhor combinação desses...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Passiflora edulis; Híbridos; Qualidade de fruto; Produtividade; Maracujá.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000300019

Amostragem de solo e uso de "litterbags" na avaliação populacional de microartrópodos edáficos
Provedor de dados: 63
Autores: Melo,Luiz Antonio Silveira; Ligo,Marco Antonio Vieira.
A distribuição agregada de microartrópodos edáficos dificulta a obtenção da estimativa de suas populações em agroecossistemas, por amostragem de solo. Buscando uma alternativa, compararam-se coletas realizadas em saquinhos com folhedo ("litterbags") e amostras de solo, em parcelas experimentais de sistemas de produção de tomate orgânico e convencional, em Jaguariúna, SP. Utilizaram-se três parcelas de 20 x 10m de cada sistema, avaliando-se as populações de Acari e Collembola presentes em quatro amostras de solo e em dois "litterbags" de cada parcela. Foram identificadas 30 famílias de Acari e quatro de Collembola nos sistemas de produção, 88% estando presentes em orgânico e 70% em convencional avaliados por "litterbags" e 53% em quaisquer dos sistemas...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Acari; Amostragem; Avaliação de impacto; Bioindicadores; Collembola; Mesofauna de solo; Tomate.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000300003

Morphogenesis on age categories of tillers in marandu palisadegrass
Provedor de dados: 63
Autores: Paiva,Adenilson José; Silva,Sila Carneiro da; Pereira,Lilian Elgalise Techio; Caminha,Fábio Olegário; Pereira,Priscila de Mesquita; Guarda,Vitor Del'Álamo.
Knowledge regarding morphogenetic characteristics has contributed to the understanding of plant responses to variations in climatic conditions and management practices. However, the original framework has been developed for temperate grass species, and indicates no ontogenetic effect on the expression of morphogenetic traits. Similar information for tropical grass species is scarce, but not less important. This experiment aimed at evaluating the influence of tiller age on the morphogenetic characteristics of continuously stocked marandu palisadegrass swards maintained at 30 cm and fertilized with nitrogen (N). Treatments corresponded to three nitrogen application rates (150, 300 and 450 kg ha-¹ of N) plus the control (no fertilization) and were assigned to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brachiaria brizantha; Tiller age; Nitrogen; Morphogenetic characteristics.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000600003

Capacidade reprodutiva de Trichospilus diatraeae (Hymenoptera: Eulophidae) em pupas de diferentes hospedeiros (Lepidoptera)
Provedor de dados: 63
Autores: Paron,Miriam Rosa; Berti-Filho,Evôneo.
Este trabalho teve como objetivo verificar a capacidade reprodutiva do parasitóide Trichospilus diatraeae Cherian &amp;amp; Margabandhu, 1942 (Hym.: Eulophidae) em pupas de quatro hospedeiros lepidópteros: Diatraea saccharalis F. (Pyralidae), Anticarsia gemmatalis Hübner, Spodoptera frugiperda J.E. Smith e Heliothis virescens F. (Noctuidae). Os experimentos foram realizados em câmara climatizada do tipo B.O.D. a 25 ± 1°C, com 70 ± 10% de Umidade Relativa e Fotofase de 14h. Não foi observada diferença na porcentagem de parasitismo entre as espécies, mas houve diferença no número de parasitóides emergidos, sendo menor em H. virescens (105,3 ± 2,9 parasitóides/pupa) e maior em S. frugiperda (130,6 ± 5,8 parasitóides/pupa). Todavia não houve diferença entre D....
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Inseto; Parasitóide; Pupa.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000200025

Modeling boron adsorption on five soils before and after removal of organic matter
Provedor de dados: 63
Autores: Santos,Patricia dos; Goldberg,Sabine; Costa,Antonio Carlos Saraiva da.
ABSTRACT Boron- B concentrations that cause deficiency and those that cause toxicity appear to be very similar, compared to other nutrients, which can complicate successful management of this element in soils. In this study, B adsorption onto two Oxisols from Brazil (Rhodic Eutroperox and Anionic Acroperox), two Alfisols (Natric Palexeralf and Aridic Paleustalf) and an Entisol (Xeric Torrifluvent) from the United States of America were evaluated. The samples were treated with sodium hypochlorite in order to remove soil organic matter. Both treated and untreated samples were used to determine B adsorption isotherms using different B concentrations (0-4.630 mmol L–1) and NaNO3 (0.05 M) as background electrolyte solution at pH 7. Boron adsorption envelopes...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: FITEQL; Chemical properties; Mineralogy.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000401401

Assessing biophysical variable parameters of bean crop with hyperspectral measurements
Provedor de dados: 63
Autores: Monteiro,Priscylla Ferraz Câmara; Angulo Filho,Rubens; Xavier,Alexandre Cândido; Monteiro,Rodrigo Otávio Câmara.
Recently high spectral resolution sensors have been developed, which allow new and more advanced applications in agriculture. Motivated by the increasing importance of hyperspectral remote sensing data, the need for research is important to define optimal wavebands to estimate biophysical parameters of crop. The use of narrow band vegetation indices (VI) derived from hyperspectral measurements acquired by a field spectrometer was evaluated to estimate bean (Phaseolus vulgaris L.) grain yield, plant height and leaf area index (LAI). Field canopy reflectance measurements were acquired at six bean growth stages over 48 plots with four water levels (179.5; 256.5; 357.5 and 406.2 mm) and tree nitrogen rates (0; 80 and 160 kg ha-1) and four replicates. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hyperspectral remote sensing; Spectroradiometry; Vegetation indices.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162012000200001

Nitrogen availability, leaf life span and nitrogen conservation mechanisms in leaves of tropical trees
Provedor de dados: 63
Autores: Corte,Guilherme Nascimento; Macchiaverni,Patrícia; Fabbro,Inácio Maria Dal; Haddad,Claudia Regina Baptista.
Evergreen species of temperate regions are dominant in low-nutrient soils. This feature is attributed to more efficient mechanisms of nutrient economy. Nevertheless, the cashew (Anacardium occidentale- Anacardiaceae), a deciduous species, is native to regions in Brazil with sandy soil, whilst the annatto (Bixa orellana- Bixaceae), classified as an evergreen species native to tropical America, grows spontaneously in regions with more humid soils. Evergreens contain robust leaves that can resist adverse conditions for longer. The physical aspects of the leaves and mechanisms of nutrient economy between the two species were compared, in order to verify whether the deciduous species had more efficient mechanisms that might explain its occurrence in regions of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Leaf deciduity; Nitrogen resorption proficiency; Nitrogen use efficiency; Leaf rupture strain.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000600014

Diet digestibility and performance of dairy cows supplemented with live yeast
Provedor de dados: 63
Autores: Bitencourt,Luciene Lignani; Silva,José Ricardo Martins; Oliveira,Bruno Menezes Lopes de; Dias Júnior,Gilson Sebastião; Lopes,Fernanda; Siécola Júnior,Sancho; Zacaroni,Ozana de Fátima; Pereira,Marcos Neves.
Dietary yeast supplementation may improve the digestive efficiency of ruminants, but responses depend on the yeast strain and the diet composition. Corn silage and citrus pulp are usual carbohydrate sources for dairy cows in southeast Brazil. This study evaluated the supplementation of dairy cows fedding on corn silage-citrus pulp-based diets with Saccharomyces cerevisiae CNCM I-1077 (Lallemand SAS, Toulouse, France). Twenty multiparous, midlactation Holstein cows were assigned to two treatments in crossover design. Treatments were: live yeast on oyster meal capable of supplying a daily minimum of 1 × 10(10) CFU per cow or oyster meal top-dressed at 10 g to the morning meal. Diet contained (% of dry matter): 16.8% crude protein, 30.9% neutral detergent...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Saccharomyces cerevisiae; Citrus pulp; Probiotic.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000300005

Feeding restriction impairs milk yield and physicochemical properties rendering it less suitable for sale
Provedor de dados: 63
Autores: Fruscalso,Vilmar; Stumpf,Marcelo Tempel; McManus,Concepta Margaret; Fischer,Vivian.
Feed shortages are relatively frequent in subtropical pasture-based dairy production systems. The effect of feed restriction on milk yield and physical-chemical traits was evaluated in this study. The experiment was carried out in Brazil's south region. Treatments consisted of control and restricted diet. Six multiparous and six primiparous cows, with 499 ± 47.20 kg body weight (BW), at mid-lactation (188 ± 124 days in milk), producing 19.35 ± 4.10 kg of milk were assigned to two groups, balanced for parity, each group receiving a different sequence of the dietary treatments for 56 days, in a crossover design. Diet nominated as control included 8 kg DM 100 kg BW-1 of Bermuda grass var. Tifton pasture (Cynodon dactylon (L.) Pers.), 5.00 kg of concentrate...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Alcohol test; Grazing systems; Milk stability; Underfeeding.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162013000400003

Influência do fornecimento prolongado de colostro sobre a flutuação de proteínas séricas em bezerros com diferentes níveis de imunidade passiva sérica
Provedor de dados: 63
Autores: Baracat,R.S.; Machado Neto,R.; Daniele,C.; Bessi,R.; Packer,I.U.
O presente trabalho teve como objetivo avaliar o comportamento das proteínas séricas de 32 bezerros recém-nascidos submetidos a diferentes programas de aleitamento. Foram utilizados animais com duas diferentes condições de imunidade passiva adquirida, alta e baixa, divididos em dois grupos, com e sem fornecimento prolongado de colostra. Os tratamentos foram os seguintes: T1 - alto/leite; T2 -baixo/leite; T3 - alto/colostro; T4 - baixo/ colostro. Foram avaliados os parâmetros séricos de proteína total (PT), albumina e imunoglobulina G (IgG). O grupo alto (T1 e T3) apresentou uma concentração média superior de proteína total (p = 0,0033) e imunoglobulina (p = 0,0001) séricas comparadas com os valores encontrados para o grupo baixo (T2 e T4). Proteína total e...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Colostro; Proteínas séricas; Imunidade passiva; Bezerro.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000300021

Efeitos de filtros e alturas de enxertia no desenvolvimento e produção da mangueira, var. Tommy Atkins
Provedor de dados: 63
Autores: Sampaio,V. R; Simão,S.
Estudou-se o efeito da introdução de filtros, com duas dimensões (15 e 30cm), de três variedades de mangueiras (Coquinho, Carlota e Imperial) e duas alturas de enxertia (25 e 55cm), na var. Tommy-Atkins, enxertada na var. Espada. Os resultados mostraram que os tratamentos não afetaram o desenvolvimento vegetativo das mangueiras, avaliados após seis anos de implantação do experimento, através dos parâmetros: perímetro do porta-enxerto e filtro, altura e diâmetro da copa. As produções de frutos analisadas após quatro colheitas, embora acusassem certa variação entre os tratamentos, não foram estatisticamente significantes.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mangueira; Filtro; Altura de enxertia.
Ano: 1996
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161996000100028

Identification of geneticaly modified soybean seeds resistant to glyphosate
Provedor de dados: 63
Autores: Tillmann,Maria Ângela André; West,Shirlie.
Advances in genetic engineering permit the modification of plants to be tolerant to certain herbicides that are usually not selective. For practical and commercial purposes, it is important to be able to detect the presence or absence of these traits in genotypes. The objective of this research was to develop a procedure for identifying genetically modified soybean (Glycine max L. Merr.) with resistance to the herbicide glyphosate. Two studies were conducted based on germination test. In the first study, soybean seeds were pre-imbibed in paper towel with the herbicide solutions, then transferred to moist paper towel for the germination test. In the second study, seeds were placed directly in herbicide solutions in plastic cups and tested for germination...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Transgenic; Germination; Detection; Glyphosate.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000300017

Citrus postharvest diseases and injuries related to impact on packing lines
Provedor de dados: 63
Autores: Fischer,Ivan Herman; Ferreira,Marcos David; Spósito,Marcel Bellato; Amorim,Lilian.
Brazilian exports of fresh citrus represent less than 1% of the overall Brazilian production. Phytosanitary barriers and poor appearance stand out among the several reasons contributing to such low exporting/production ratio. The purpose of this work was to characterize postharvest injuries in 'Valencia' sweet oranges and 'Murcott' tangors produced for foreign markets after different processing stages in a packinghouse, as well as to identify critical points and impact extent on packing lines. Sampling was performed both after pre-washing and degreening the fruits, and also at the arrival on the packing table and in the pallet. They were stored for 21 days at 25ºC and 85% RH. The incidence of injuries was visually assessed every three days. An instrumented...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brazil; 'Valencia' sweet orange; 'Murcott' tangor; Fungal rots; Mechanical damages.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000200010

Contrastes ortogonais na análise do controle de volatilização de amônia em compostagem
Provedor de dados: 63
Autores: Corrente,José Eduardo; Nogueira,Maria Cristina Stolf; Costa,Beatriz Montrágio.
O uso de contrastes ortogonais na análise de experimentos é uma técnica que tem se revelado bastante eficiente na obtenção de efeitos principais, de interação e efeitos aninhados. Em geral, essa técnica é mais útil para a análise de dados de um experimento não convencional, que é aquele que não segue uma estrutura definida. Com esse objetivo, aplicou-se esta técnica aos dados obtidos em um experimento para controlar as perdas de amônia por volatilização com diferentes níveis de acidez residual associados a três aditivos e quatro doses, adicionando uma testemunha. Desse modo, a análise estatística foi conduzida segundo um delineamento inteiramente casualizado numa classificação mista com um tratamento adicional. Os efeitos principais de aditivos e doses,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Compostagem de esterco; Volatilização; Tratamento adicional; Contraste ortogonal.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000200027

Determination of a point sufficiently close to the asymptote in nonlinear growth functions
Provedor de dados: 63
Autores: Mischan,Martha Maria; Pinho,Sheila Zambello de; Carvalho,Lídia Raquel de.
Growth functions with upper horizontal asymptote do not have a maximum point, but we frequently question from which point growth can be considered practically constant, that is, from which point the curve is sufficiently close to its asymptote, so that the difference can be considered non-significant. Several methods have been employed for this purpose, such as one that verifies the significance of the difference between the curve and its asymptote using a t-test, and that of Portz et al. (2000), who used segmented regression. In the present work, we used logistic growth function, which has horizontal asymptote and one inflection point, and applied a new method consisting in the mathematical determination of a point in the curve from which the growth...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nonlinear regression; Logistic model; Critical point of growth.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000100016

ÁCIDO GIBERÉLICO E O DESENVOLVIMENTO DE PLÂNTULAS DE TANGERINA 'CLEÓPATRA' (Citrus reshni hort. ex. Tanaka)
Provedor de dados: 63
Autores: Modesto,Júnior Cesar; Rodrigues,João Domingos; Pinho,Sheila Zambello de.
Plântulas de tangerina 'Cleópatra'(Citrus reshni hort. ex. Tanaka), foram utilizadas em delineamento inteiramente casualizado, com três repetições no esquema de parcelas sub-divididas, onde os tratamentos principais foram 5 concentrações de ácido giberélico: T1 = 0, T2 = 25, T3 = 50, T4 = 100 e T5 = 150 mg.L-1, parceladas em quatro pulverizações. As coletas de material foram realizadas dos 70 aos 210 dias, em intervalos de 14 dias. Pelos resultados obtidos, o fitorregulador promoveu efeito favorável com relação ao incremento do comprimento do caule, sendo que aplicações de 100 e 150 mg.L-1 foram superiores as demais. O diâmetro do caule não foi influenciado pela aplicação de ácido giberélico.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Porta-enxerto; Reguladores vegetais; Caule; Crescimento.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000200005

Cachaça Production in Brazil and its Main Contaminant (Ethyl Carbamate)
Provedor de dados: 63
Autores: Silva,João Henrique do Nascimento e; Verruma-Bernardi,Marta Regina; Oliveira,Alessandra Lopes de.
ABSTRACT This review aims to demonstrate the possible formation of Ethyl carbamate (EC) in different production stages of cachaça. EC is a carcinogen confirmed in animal experiments and possibly carcinogenic to humans. EC incidence below relevant health limits naturally affects many fermented foods and beverages. Concentrations above 1 mg L–1 are often detected in certain spirits derived from cyanogenic plants. In Brazil, cachaça is widely consumed and therefore consumers are at health risk if they drink EC beverages at high concentrations, since the amount of EC in cachaça (sugar cane brandy) constantly exceeds the threshold 0.21 mg L–1, damaging the health of consumers and hindering exportation to North America and Europe. Many studies have reported on...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sugarcane; Spirits; Quality; Beverage; Public health.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000201800

Organic acids effects on desorption of heavy metals from a contaminated soil
Provedor de dados: 63
Autores: Nascimento,Clístenes Williams Araújo do.
Phytoremediation of heavy metals is a biotechnology that extracts metals from soils and transfer them to plant. As hyperaccumulator species have demonstrated low potential for commercial phytoextraction, synthetic chelates have been successfully used to induce accumulation of metals by high-biomass plants. However, they pose serious environmental drawbacks regarding excessive amount of metals solubilized. In search for synthetic chelate-alternatives, this paper evaluate the performance of DTPA, EDTA, citric acid, oxalic acid, vanillic acid, and gallic acid in desorbing Cd, Pb, Zn, Cu, and Ni from soil. DTPA and EDTA were highly effective in desorbing Cd, Pb, Zn, Cu, and Ni from soil. However, the excessively high concentration of metals brought in solution...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phytoremediation; Phytoextraction; Soil pollution.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000300010

Genetic diversity of American wild rice species
Provedor de dados: 63
Autores: Veasey,Elizabeth Ann; Bressan,Eduardo de Andrade; Zucchi,Maria Imaculada; Vencovsky,Roland; Cardim,Daruska Cavalcante; Silva,Rainério Meireles da.
Studies on genetic diversity and genetic structure of natural populations are important in order to define strategies for in situ and ex situ conservation actions and for plant pre-breeding programs. Aiming to assess the genetic diversity and genetic structure of three wild American Oryza species with isozyme markers, 14 populations of the diploid O. glumaepatula (AglAgl), 11 populations of the tetraploid O. grandiglumis (CCDD) and five populations of the also tetraploid O. latifolia (CCDD) were studied. They were all originated from Rio Paraguay hydrographic basin and the Amazon. Four enzymes were used and they gave 40 polymorphic bands. The most polymorphic species was O. glumaepatula, followed by O. latifolia and O. grandiglumis. A cluster analysis with...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Oryza glumaepatula; O. latifolia; O. grandiglumis; Amazon; Genetic structure.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000400008

Saponin production from Quillaja genus species. An insight into its applications and biology
Provedor de dados: 63
Autores: Guerra,Fernando; Sepúlveda,Sebastián.
ABSTRACT: Quillaja genus (Quillajaceae family) is endemic to South America, where is represented by two species, Quillaja saponaria and Quillaja brasiliensis. One outstanding characteristic of these forest tree species is their production of saponins, a family of amphipathic glycosides, involved in the defensive response of plants against biotic and abiotic factors. Saponins are metabolites of economic importance due to their chemical and physical properties. Basic and applied research efforts performed during the last decades, mainly on Q. saponaria, have placed these compounds as an important raw material in industrial areas, such as food and beverage, cosmetics, vaccine production, biopesticides, among others. In this review, we summarize information on...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Triterpenes; Secondary metabolism; Chemical structure; Biosynthesis pathway; Genes.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000501802

Densidade de plantas e produção de amendoim
Provedor de dados: 63
Autores: Nakagawa,João; Lasca,Dalmo de Campos; Neves,Gessy de Souza; Neves,João Paulo de Souza; Silva,Maurício Nunes da; Sanches,Sérgio Veraguas; Barbosa,Valmir; Rossetto,Cláudia A. V.
Para estudar o efeito da densidade de plantas sobre a produção de vagens e seus componentes na cultura do amendoim cv. Tatu, em solos com diferentes fertilidades, foram realizados três experimentos, em condições de campo, no município de Pontal, SP, em um Latossolo Roxo, em anos agrícolas distintos, no cultivo das águas. As densidades estudadas foram 5, 8, 11, 14, 17, 20, 23 e 26 plantas por metro, em espaçamento de 0,60 m entre linhas. O componente de produção responsável pela variação da produção de vagens por planta foi o número de vagens, tendo diminuído com o aumento da densidade de plantas. Nas maiores densidades de plantas, as produções por planta foram menores, todavia devido à maior população de plantas, foram obtidas nestas as maiores...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Arachis hypogaea; Vagem; Fertilidade; Solo.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000100012

Potential of the ESA23B maize population for protein and oil content improvement
Provedor de dados: 63
Autores: Mittelmann,Andréa; Miranda Filho,José Branco de; Lima,Gustavo Júlio Mello Monteiro de; Hara-Klein,Claudete; Tanaka,Ricardo Takao.
Among the traits that may add commercial value to maize (Zea mays L.), those related to nutritional quality, specially protein and oil content, are of great interest to the feed industry. The objective of this work was studying the variability of protein and oil content, as well as yield, in a group of maize testcrosses. One hundred and twenty S1 families of the ESA23B maize population were crossed with two testers, an open-pollinated population (BR108) and an exotic line (CML269). Testcrosses were evaluated at two locations under a completely randomized block design with three replications. Ear and grain yield, protein and oil content were evaluated. The three-way interaction location x tester x progeny was significant for all traits, except for oil...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays; Breeding; Topcross; Nutritional quality; Grains.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000200017

Superação da dormência de sementes de mucuna-preta pela utilização de "calor seco"
Provedor de dados: 63
Autores: Wutke,E.B.; Maeda,J.A.; Pio,R.M.
Avaliou-se a germinação de sementes recém-colhidas de mucuna preta (Mucuna aterrima) após tratamento com "calor seco", em estufa elétrica com ventilação forçada, nas temperaturas de 35, 45 e 55°C, por períodos de exposição correspondentes a 0, 2, 4, 6, 8,16,24, 48, 72 e 96 horas. A temperatura de 55°C foi adequada para a superação da impermeabilidade do tegumento da semente, sendo mais efetivos os períodos de exposição entre 16 e 24 horas.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mucuna preta; Mucuna aterrima; Dormência de sementes; Calor seco; Germinação.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000300013

Extração e dosagem da atividade da polifenoloxidase do café
Provedor de dados: 63
Autores: Mazzafera,Paulo; Gonçalves,Kátia Viviane; Shimizu,Milton Massao.
A atividade de polifenoloxidase (PFO) tem sido usada como indicadora da qualidade de bebida de café. Foram feitas comparações entre o método tradicionalmente usado para extração de polifenoloxidase de café e outro, onde impediu-se a oxidação de fenóis durante a extração, com posterior eliminação por filtração em coluna de exclusão. Um método intermediário entre os dois também foi testado. As medições de atividade foram feitas por espectrofotometria e por consumo de O2. Os métodos tradicionais de extração e dosagem da atividade de PFO sofrem forte interferência de fenóis presentes no extrato, não permitindo reprodução dos dados publicados na literatura. Por espectrofotometria foi possível diferenciação apenas entre café de bebida Mole de cafés de bebida...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ácido clorogênico; Café; Qualidade de bebida.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000400012

Quality control and characterization of the testicles and ovaries of irradiated Anastrepha obliqua from Brazil
Provedor de dados: 63
Autores: Costa,Karen Zamboni; Costa,Maria Lourdes Zamboni; Botteon,Victor Wilson; Faggioni,Kenya Martins; Costa,Neivaldo; Mastrangelo,Thiago.
ABSTRACT: With the aim of making the application of the Sterile Insect Technique (SIT) feasible in the management of the West Indian fruit fly in Brazil, Anastrepha obliqua (Macquart) (Diptera: Tephritidae), a number of quality parameters required by the SIT were investigated in this study. The aim was to verify the influence of a range of doses of gamma radiation (40, 50, 60, 70 and 80 Gy) on the fertility of females and to evaluate several quality control parameters, such as fly emergence, sex ratio, flight ability and survival under stress, as well as the characterization of the morphology (measurement of length and width) of the ovaries and testicles of A. obliqua. Pupae with 24 h before adult emergence were irradiated at CENA/Universidade de São...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sterile Insect Technique; West Indian fruit fly; Radiosterilization; Ovarian atrophy; Flight ability.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000100800

Soil acidity, liming and soybean performance under no-till
Provedor de dados: 63
Autores: Caires,Eduardo Fávero; Barth,Gabriel; Garbuio,Fernando José; Churka,Susana.
The effects of soil chemical changes on soybean root growth, mineral nutrition and grain yield, as a result of surface application of lime under no-till (NT), are still under discussion. A field trial was carried out on a loamy dystrophic Typic Hapludox at Ponta Grossa, Paraná State, Brazil, using a completely randomized block design with three replicates, in a split-plot experiment. The main plots received four dolomitic lime rates applied on the surface (0, 2, 4, and 6 Mg ha-1) in July 1993. In the subplots, two dolomitic lime rates were reapplied on the surface (0 and 3 Mg ha-1) in June 2000. After nine years, liming increased pH, exchangeable Ca2+ and reduced exchangeable Al3+ as well as soil Al3+ saturation down to a 60 cm depth. Re-liming, after two...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycine max (L.) Merrill; Acidity; Subsoil; Root system; Nutrient.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000500013

Controle do ácaro da falsa ferrugem (Phyllocoptruta oleivora Ashm., 1879) por um juvenóide e outros defensivos agrícolas
Provedor de dados: 63
Autores: Rangel,R.C.; Hamamura,R.; Regitano,E.B.; Clari,A.I.; Mesquita,L.F.; Cardoso,M.A.C.; Mariconi,F.A.M.
Vários defensivos agrícolas, incluindo um juvenóide, foram aplicados contra o acaro da falsa ferrugem em pomar localizado em Limeira,SP, uma das principais áreas citrícolas do Brasil. Os tratamentos constaram de uma única aplicação, feita em 01/10/89. Tratamentos: A) testemunha; B) flucicloxurom (juvenóide) 40 cm³; C) bromopropilato 65 cm³; D) quinometionato + enxofre 200 cm³; E) quinometionato + enxofre 250 cm³; F) formetanato22,5 g; G) formetanato 31,5 g. As quantidades referem-se aos produtos comerciais para 100 litros de água. Cada laranjeira recebeu 10 litros de calda. Espalhante-adesivo: "Extravon" (25 cm³/100 litros). O delineamento estatístico feito foi de blocos ao acaso, com 4 repetições. Foram feitas 6 avaliações: 1 prévia e 5 após 06, 20, 36,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ácaro da falsa ferrugem; Citros; Phyllocoptruta oleivora; Juvenóide.
Ano: 1993
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161993000100009

Produtividade agrícola de cultivares de cana-de-açúcar em diferentes solos e épocas de colheita
Provedor de dados: 63
Autores: Maule,Rodrigo Fernando; Mazza,Jairo Antonio; Martha Jr.,Geraldo Bueno.
A cultura da cana-de-açúcar é destaque no cenário agrícola do Brasil, sendo cultivada em vários tipos de ambiente (associação de clima e solo). O estudo das respostas dos diferentes cultivares em cada ambiente de produção auxilia a maximizar a exploração econômica da cultura. Neste contexto, três experimentos em blocos completos casualizados com quatro repetições foram delineados para determinar as produtividades de colmos e a pol % cana de nove cultivares de cana-de-açúcar em dois solos: Planossolo mesotrófico textura arenosa/média (PL) e Podzólico Vermelho Amarelo mesotrófico textura arenosa/média (PV). Os cultivares foram colhidas em três épocas: maio, agosto e outubro de 1997. As produtividades de colmos foram superiores (P&lt;0,01) no PV. Os...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cana-de-açúcar; Cultivar; Solo; Época de colheita; Maturação.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000200012

Physical and metabolic alterations in "Prata Anã" banana induced by mechanical damage at room temperature
Provedor de dados: 63
Autores: Maia,Victor Martins; Salomão,Luiz Carlos Chamhum; Siqueira,Dalmo Lopes; Puschman,Rolf; Mota Filho,Virgílio Jamir Gonçalves; Cecon,Paulo Roberto.
Bananas respond at the physical and physiological level to mechanical damage. Mechanical injuries cause alterations in color and flavor, tissue softening, faster ripening, increased weight loss, increased invasion of microorganisms, and higher enzyme activity in the affected area. The purpose of this study was to verify the physical and metabolic alterations in 'Prata Anã' bananas induced by mechanical stress at room temperature. The experiment was conducted in a completely randomized, split-plot in time design, consisting of one control and four mechanical injury types: cutting, abrasion, impact and compression, sampled over time. The percentage of accumulated and daily fresh weight loss, electrolyte leakage from the injured peel region, total soluble...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Postharvest; Musa spp; Injury.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000100005

A hydropedological approach to a mountainous Clayey Humic Dystrudept in the Mantiqueira Range, southeastern Brazil
Provedor de dados: 63
Autores: Pinto,Leandro Campos; Mello,Carlos Rogério de; Norton,Lloyd Darrell; Poggere,Giovana Clarice; Owens,Phillip Ray; Curi,Nilton.
ABSTRACT: The Mantiqueira Range region is one of the most important headwaters in southeastern Brazil. In this context, the relationship between pedology and hydrology has been debated and analyzed in recent years, contributing to the creation of a multidisciplinary science call hydropedology. Therefore, the aim of this study was to evaluate the hydropedological properties of a mountainous Clayey Humic Dystrudept in the Mantiqueira Range region, in the state of Minas Gerais, Brazil, comparing two land-uses, native forest and pasture. The hydraulic conductivity results demonstrated that native forest (MFO) has a strong influence on this parameter, offering conditions for movement of water in the soil that are more adequate in this profile than in pasture....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: S index; Saturated hydraulic conductivity; Soil pore size distribution; Soil erosion; Water quality.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162018000100060

Preventing thermoinhibition in a thermosensitive lettuce genotype by seed imbibition at low temperature
Provedor de dados: 63
Autores: Nascimento,Warley Marcos.
Lettuce (Lactuca sativa L.) seed germination is strongly temperature dependent and under high temperatures, germination of most of genotypes can be erratic or completely inhibited. Lettuce seeds of 'Dark Green Boston' (DGB) were incubated at temperatures ranging from 15° to 35°C at light and dark conditions. Other seeds were imbibed in dark at 20°; 25°; 30°; and 35°C for 8 and 16 hours and then transferred to 20 or 35°C, in dark. Seeds were also incubated at constant temperature of 20° and 35 °C, in the dark, as control. In another treatment, seeds were primed for 3 days at 15°C with constant light. DGB lettuce seeds required light to germinate adequately at temperatures above 25°C. Seeds incubated at 20°C had 97% germination, whereas seeds incubated at...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Germination; Dormancy; Seed priming; Stand establishment.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000300010

Production and characterization of a new mango distilled beverage
Provedor de dados: 63
Autores: Oliveira,Patrícia Natielly de; Alcarde,André Ricardo; Bortoletto,Aline Marques; Abud,Ana Karla de Souza; Oliveira Júnior,Antonio Martins de.
ABSTRACT The large scale of mango production allows for the application of immediate technologies to minimize post-harvest losses and add even more value to the fruit chain. As a consequence of feasible applications, the production of alcoholic beverages through fermentation and distillation has been elaborated, resulting in a supply of products with different characteristics. This study aimed to monitor the development of a distilled mango beverage and its profile for consumption. The mangoes were selected, pulped and subjected to physicochemical characterization and, subsequently, to fermentation and distillation processes where the kinetics were monitored, and the beverage obtained was compared to similar products found in the literature. During column...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mangifera indica; Distillation; Spirit; Chemical composition.
Ano: 2022
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162022000100902

Models to estimate phytomass accumulation of hydroponic lettuce
Provedor de dados: 63
Autores: Lopes,Sidinei José; Dourado Neto,Durval; Manfron,Paulo Augusto; Jasniewicz,Luís Renato.
The protected and hydroponics cultivation are increasing in Brazil, demanding a better knowledge of crop performance in this environment. Plant dry matter accumulation as a function of solar radiation, temperature, relative humidity and other weather parameters in greenhouse is different when compared with field cultivation. With the purpose of proposing models to characterize the temporal variation of leaf and total dry matter production of hydroponics-grown lettuce (Lactuca sativa L.) and to determine the flowering period and the maximum dry matter accumulation rate as a function of plant relative development (relative degree-days), solar radiation and effective thermal index, two experiments (Spring and Autumn) were carried out in the greenhouse, at...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Modeling; Dry matter; Plastic-greenhouse.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000400007

Survey of fungi associated with cassava root rot from different producing regions in Brazil
Provedor de dados: 63
Autores: Boas,Sandielle Araújo Vilas; Oliveira,Saulo Alves Santos de; Bragança,Carlos Augusto Dórea; Ramos,Juliana Barros; Oliveira,Eder Jorge de.
ABSTRACT: Although root rot is one of the major diseases affecting Brazilian cassava (Manihot esculenta Crantz.), little is known about the diversity of root rot pathogens. In this study, diseased plants exhibiting root rot symptoms were collected from cassava-producing regions in five Brazilian states: Bahia, Sergipe, Paraíba, Maranhão, Tocantins, and Paraná. Seventy isolates were obtained and assigned to species complexes based on rDNA's ITS (internal transcribed spacer of the ribosomal DNA) region (ITS1, ITS2 and 5.8S). A total of seven species complexes was found belonging to the genus Fusarium (56/74), followed by Lasiodiplodia (8/74), Neoscytalidium (6/74), and Diaporthe/Phomopsis complex (2/74), Phytophthora, and Corallomycetella (1/74 each). These...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Manihot esculenta; ITS barcode; Phylogeny; Soil-borne diseases.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162017000100060

Uso de estufa com cobertura plástica e de quebra-ventos na produção de porta-enxertos de seringueira
Provedor de dados: 63
Autores: Pezzopane,J.E.M.; Pedro Jr.,M.J.; Ortolani,A.A.
O experimento foi realizado com o objetivo de estudar o efeito de dois tipos de ambiente parcialmente protegidos: estufa coberta com polietileno transparente de baixa densidade (PEBD) e quebra-ventos construído com tela plástica, no crescimento de porta-enxertos de seringueira, durante o inverno na região de Campinas-SP. A fim de analisar o crescimento dos porta-enxertos, foram medidos: diâmetro, altura, área foliar e peso seco. Os resultados obtidos na condição experimental, mostraram que as plantas protegidas pelo quebra-ventos não apresentaram uma diferença significativa no crescimento em relação a testemunha, mas que o uso da estufa provocou um incremento em diâmetro (60%), altura (108%), área foliar (266%) e peso da matéria seca (286%) dos...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Porta-enxerto de seringueira; Estufa; Quebra-ventos.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000300006

Viabilidade econômica da cultura do melão (Cucumis melo L.) na região de Ilha Solteira - SP
Provedor de dados: 63
Autores: Paulino,H.B.; Tarsitano,M.A.A.; Hernandez,F.B.T.; Bizetti,S.
Com o objetivo de se verificar a viabilidade econômica da cultura do melão, na região de Ilha Solteira, ano agrícola 1991/92, procedeu-se a uma análise econômica para estudar o comportamento de dois cultivares de melão Eldorado 300 e Valenciano Amarelo CAC, variando a adubação de cobertura, ou seja, utilizando-se 3 doses de N e de K2O: 2,5; 5,0 e 10,0 g/planta. O experimento foi irrigado através de um sistema de gotejamento, sendo que o investimento inicial para aquisição do material de irrigação para uma área de 1 ha, foi da ordem de US$ 11.500,00. Apesar do alto valor do investimento inicial, a cultura se mostrou altamente rentável. Com os resultados obtidos, verificou-se que todos os tratamentos apresentaram rentabilidade positiva, sendo que a maior...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Custo de produção; Sistema de produção; Melão.
Ano: 1994
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000300025

Qualidade de maçãs cv. gala armazenadas em diferentes pressões parciais de O2 e CO2
Provedor de dados: 63
Autores: Brackmann,Auri; Waclawovsky,Alessandro Jaquiel; Lunardi,Rosângela.
Este trabalho teve como objetivo verificar os efeitos da temperatura e pressões parciais de O2 e CO2 sobre a qualidade da maçã cv. Gala armazenada em atmosfera controlada. O delineamento experimental foi o inteiramente casualizado com três repetições de 30 frutos. Os tratamentos foram: 1,0 kPa de O2 e 2,0 kPa de CO2; 1,0 kPa de O2 e 3,0 kPa de CO2; 1,0 kPa de O2 e 4,0 kPa de CO2; 0,75 kPa de O2 e 2,0 kPa de CO2; 0,75 kPa de O2 e 3,0 kPa de CO2 e, 21,0 kPa de O2 e 0,0 kPa de CO2 na temperatura de 0 e 1ºC. A UR permaneceu em torno de 97%. O período de armazenamento foi de oito meses, sendo que as análises foram realizadas no momento da retirada dos frutos das câmaras e após sete dias de exposição dos mesmos à temperatura ambiente (24ºC). Avaliou-se firmeza...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Malus domestica; Conservação; Pós-colheita.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000200001

Dissecting the Opaque-2 regulatory network using transcriptome and proteome approaches along with enzyme activity measurements
Provedor de dados: 63
Autores: Lefèvre,Agnès; Consoli,Luciano; Gaziola,Salete A.; Pellegrino,Ana Paula; Azevedo,Ricardo A.; Damerval,Catherine.
The Opaque-2 (O2) gene encodes a transcriptional activator specifically expressed for grain development of maize. o2 mutants have an opaque and chalky kernel, with a decrease in zein storage protein content, and an increase in the proportions of lysine and tryptophan. In this review, we present recent results investigating genetic properties of the O2 network, using transcriptome and proteome approaches, associated with measurements of activities of enzymes of the aspartate pathway and lysine degradation. The structural polymorphism at the O2 locus was investigated by RFLP in a collection of 51 maize inbred lines. Most polymorphic sites were found outside the coding regions. We then searched for relationships between RFLP polymorphism and (i) mRNA...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zein; Aspartate kinase; Lysine oxoglutarate reductase/saccharopine dehydrogenase; Polymorphism.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000200031

Bayesian analysis of autoregressive panel data model: application in genetic evaluation of beef cattle
Provedor de dados: 63
Autores: Silva,Fabyano Fonseca e; Sáfadi,Thelma; Muniz,Joel Augusto; Rosa,Guilherme Jordão Magalhães; Aquino,Luiz Henrique de; Mourão,Gerson Barreto; Silva,Carlos Henrique Osório.
The animal breeding values forecasting at futures times is a relevant technological innovation in the field of Animal Science, since its enables a previous indication of animals that will be either kept by the producer for breeding purposes or discarded. This study discusses an MCMC Bayesian methodology applied to panel data in a time series context. We consider Bayesian analysis of an autoregressive, AR(p), panel data model of order p, using an exact likelihood function, comparative analysis of prior distributions and predictive distributions of future observations. The methodology was tested by a simulation study using three priors: hierarchical Multivariate Normal-Inverse Gamma (model 1), independent Multivariate Student's t Inverse Gamma (model 2) and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: MCMC; Time series forecasting; Prior comparison; Predictive distribution.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000200015

Genetic variability and pedigree analysis of Brazilian common bean elite genotypes
Provedor de dados: 63
Autores: Alzate-Marin,Ana Lilia; Costa,Márcia Regina; Sartorato,Aloísio; Del Peloso,María José; Barros,Everaldo Gonçalves de; Moreira,Maurilio Alves.
Genetic diversity is essential for any breeding program. However, breeders tend to concentrate on specific genotypes, which combine traits of interest and may be used as progenitors in several breeding programs. Common bean (Phaseolus vulgaris L.) breeding programs are not different in this sense. In this study, the genetic diversity of 21 common bean elite lines from the Bean Regional Trials conducted by the Embrapa Rice and Bean Research Center was evaluated using the Random Amplified Polymorphic DNA (RAPD) and pedigree analyses. Based on genetic dissimilarity, three groups were defined: group I - lines 1, 9 and 10, with low genetic distances among them (0.00 to 0.06), originated from 11 Mesoamerican parents; group II - 17 lines with genetic distances...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phaseolus vulgaris; Andean cultivars; Mesoamerican cultivars; RAPD molecular markers; Genetic distances.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000200012

ATIVIDADE DE PEROXIDASES (EC 1.11.1.7) E TEOR DE PROLINA EM FEIJOEIRO Phaseolus vulgaris L. CULTIVADO EM CONDIÇÕES DE SALINIDADE
Provedor de dados: 63
Autores: ROSSI,C.; LIMA,G.P.P.; HAKVOORT,D.M.R.
Alterações nos níveis de prolina e na atividade da peroxidase foram estudadas em folhas e raízes de feijoeiro em função da resposta à salinidade do meio. A atividade da peroxidase (E.C. 1.11.1.7) e o teor de prolina das folhas foi maior do que nas raízes. Os resultados mostraram que a atividade da peroxidase diminuiu, enquanto os teores de prolina aumentaram gradualmente nas plantas cultivadas em meio salino. Ocorreu diminuição do teor de potássio e aumento de sódio nos órgãos analisados, com o aumento da concentração salina.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Feijoeiro; Peroxidases; Prolina; Salinidade.
Ano: 1997
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161997000200002

A cost prediction model for machine operation in multi-field production systems
Provedor de dados: 63
Autores: Sopegno,Alessandro; Busato,Patrizia; Berruto,Remigio; Romanelli,Thiago Libório.
ABSTRACT Capacity planning in agricultural field operations needs to give consideration to the operational system design which involves the selection and dimensioning of production components, such as machinery and equipment. Capacity planning models currently onstream are generally based on average norm data and not on specific farm data which may vary from year to year. In this paper a model is presented for predicting the cost of in-field and transport operations for multiple-field and multiple-crop production systems. A case study from a real production system is presented in order to demonstrate the model’s functionalities and its sensitivity to parameters known to be somewhat imprecise. It was shown that the proposed model can provide operation cost...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Machinery management; Decision support system; Strategic management; Binary programming.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000500397

Soil-applied Zn effect on soil fractions
Provedor de dados: 63
Autores: Leite,Camila Marcon de Carvalho; Muraoka,Takashi; Colzato,Marina; Alleoni,Luís Reynaldo Ferracciú.
ABSTRACT The interaction of Zn with soil compartments influences its bioavailability and uptake by plants. In this study, rice and soybean were cultivated under greenhouse conditions with the aim of evaluating Zn bioavailability and fractionation in a clayey-textured Typic Hapludox as a function of Zn rates (4 or 8 mg kg –1 Zn). The experiment was conducted until grain filling. Two soil subsamples (t 1 and t 2 ) that referred to the seeding and flowering stages, were collected and compared with two single extraction schemes, DTPA (Zn DTPAt1 and Zn DTPAt2 ) and Mehlich-1 (Zn Mt1 and Zn Mt2 ) for Zn available contents. Zn fractionation was carried out with t 2 soil subsamples for the testing of the following fractions: exchangeable Zn (Zn Exc ), Zn bound to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: DTPA; Mehlich-1; Soil phases; Soil chemistry; Micronutrient.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000201400

Eggplant growth as affected by bovine manure and magnesium thermophosphate rates
Provedor de dados: 63
Autores: Cardoso,Marinice Oliveira; Pereira,Walter Esfrain; Oliveira,Ademar Pereira de; Souza,Adailson Pereira de.
Plant growth is influenced by nutrient availability. The objective of this research was to study, under greenhouse conditions, eggplant growth as affected by rates of bovine manure and magnesium thermophosphate (g kg-1 and mg kg-1, respectively), according to a "Box central composite" matrix: 4.15-259; 4.15-1509; 24.15-259; 24.15-1509; 0.0-884; 28.3-884; 14.15-0,0; 14.15-1768; 14.15-884. Potassium sulfate (170 mg kg-1) and 200 mL per pot of cow urine solution were applied four times, but the concentration of the last two applications (200 mL/H2O L) was twice of that of the first two. Additional treatments: magnesium thermophosphate without cow urine and triple superphosphate with urea, both with nutrient levels equivalent to the bovine manure, P2O5 and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Solanum melongena; Organic fertilization; Phosphorus; Cow urine.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000100011

Regeneração in vitro de Passiflora suberosa a partir de discos foliares
Provedor de dados: 63
Autores: Monteiro,Alessandra Cristina Boffino de Almeida; Nakazawa,Gerson Tokio; Mendes,Beatriz Madalena Januzzi; Rodriguez,Adriana Pinheiro Martinelli.
A regeneração in vitro de plantas de Passiflora suberosa foi obtida a partir de discos foliares. Folhas foram retiradas de plantas germinadas em casa de vegetação, imersas em solução comercial de hipoclorito de sódio (3:1), durante 20 minutos. Discos foliares de 0,5 cm de diâmetro, com a face adaxial em contato com o meio de cultura, foram introduzidos em placa de petri. Organogênese foi obtida utilizando-se meio MS acrescido de 0,5 ou 1,0 mg L-1 de BAP (6-benzilaminopurina). Após 4 a 8 semanas, observou-se formação de calos nas bordas dos discos foliares. Os calos formados foram transferidos para meio MSM, acrescido de 1,0 mg L-1 de GA3 (ácido giberélico), sob fotoperíodo de 16 horas. Desenvolvimento de gemas adventícias foi obtido a partir dos calos,...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: BAP (6-benzilaminopurina); Cultura de tecido; Organogênese.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000300033

Cooling parameters for fruits and vegetables of different sizes in a hydrocooling system
Provedor de dados: 63
Autores: Teruel,Bárbara; Kieckbusch,Theo; Cortez,Luis.
The cooling of fruits and vegetables in hydrocooling system can be a suitable technique. This work aimed to define cooling time for fruits and vegetables of different sizes, presenting practical indexes that could be used to estimate cooling time for produce with similar characteristics. Fruits (orange melon-Cucumis melo, mango-Mangifera indica, guava-Psidium guajava, orange-Citrus sinensis Osbeck, plum-Prunus domestica, lime-Citrus limon, and acerola-Prunus cerasus) and vegetables (cucumber-Cucumis sativus, carrot-Daucus carota, and green bean-Phaseolus vulgaris), were cooled in a hydrocooling system at 1°C. The volume of fruits and vegetables ranged between 8.18 cm³ and 1,150.35 cm³, and between 13.06 cm³ and 438.4 cm³, respectively. Cooling time varied...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cooling time; Product volume; Sphericity.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000600014

Arbuscular mycorrhizal fungal communities in native and in replanted Araucaria forest
Provedor de dados: 63
Autores: Moreira,Milene; Baretta,Dilmar; Tsai,Siu Mui; Cardoso,Elke Jurandy Bran Nogueira.
Araucaria angustifolia is an important Brazilian conifer, but it is endangered of extinction due to excessive logging. The objective of the present case study was to survey data on the diversity of AMF in Araucaria angustifolia forests, and to learn whether it is possible to discriminate between the AMF communities associated with natural, introduced, and impacted-by-anthropogenic-action ecosystems. Three ecosystems representative of the Campos do Jordão (São Paulo State, Brazil) region were selected, as follows: (i) a native climax forest, with predominance of Araucaria trees, without anthropogenic interference (NF), (ii) Araucaria forest introduced in 1959 (RE), and (iii) Araucaria forest introduced in 1958, submitted to accidental fire in July 2001...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: AMF; Brazil Pine; Diversity; Spore density; Accidental fire.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000500013

Application of semi-selective mediums in routine diagnostic testing of Pseudomonas savastanoi pv. phaseolicola on common bean seeds
Provedor de dados: 63
Autores: Popovic,Tatjana; Milovanovic,Predrag; Aleksic,Goran; Gavrilovic,Veljko; Starovic,Mira; Vasic,Mirjana; Balaž,Jelica.
Halo blight, caused by Pseudomonas savastanoi pv. phaseolicola (Psp), is considered to be an important bacterial disease on common bean (Phaseolus vulgaris L.) in Serbia. Use of pathogen-free seeds is one of the most effective control measures against this disease. The aim of this study was to evaluate a detection method for Psp on untreated common bean seeds (23 genotypes) from commercial crops grown within Serbia. Detection of this pathogen was made by plating onto the modified sucrose peptone (MSP) and Milk Tween (MT) semi-selective mediums from soaked whole common bean seed. Colonies growing on the MSP medium were light yellow, convex and shiny, whereas on the MT medium, they were creamy white, flat and circular. The pathogenicity of the obtained...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: MSP; MT; ELISA; Nested-PCR; Halo blight; Pathogenicity.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162012000400005

Deficit irrigation at different growth stages of the common bean (Phaseolus vulgaris L., cv. Imbabello)
Provedor de dados: 63
Autores: Calvache,M.; Reichardt,K; Bacchi,O.O.S.; Dourado-Neto,D.
To identify specific growth stages of the common bean crop at which the plant is less sensitive to water stress, in which irrigation could be omitted without significant decrease hi final yield, two field experiments were conducted at "La Tola" University Experimental Station, Tumbaco, Pichincha, Ecuador, on a sandy loam soil (Typic Haplustoll). The climate is tempered and dry (mean air temperature 16°C and mean relative humidity 74%, during the cropping season) 123 and 109 mm of rainfall were recorded during the experimental cropping periods (July to October), of 1992 and 1994, respectively. The treatments consisted of combinations of 7 irrigation regimes including normal watering; full stress; (traditional management practice); single stress at...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Common bean; Irrigation; Water stress; Water use efficiency.
Ano: 1997
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161997000300002

Water relations in seed biology
Provedor de dados: 63
Autores: Villela,F. A.
The water relations play a fundamental role in seed biology. Thus, the purpose of the present paper was to analyze the performance of water status in seed development and germination. The researches have suggested that the water potential of the seed or seed structures provides a better indicator of the seed water status than water content. The seed water status plays a regulatory role in seed development and germination.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Water status; Hydration levels; Water potential.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000500018

Copper desorption in a soil with variable charge
Provedor de dados: 63
Autores: Casagrande,José Carlos; Jordão,Camila Beig; Alleoni,Luís Reynaldo Ferracciú; Camargo,Otávio Antônio de.
Adsorption processes of heavy metals in soils have been more extensively studied than desorption, in spite of this latter process being related to nutrient bioavailability in the soil solution. Copper desorption from surface (0-0.2 m) and subsurface (1.0 - 1.2 m) samples of an Anionic Acrudox was studied at two pH values (4.5 and 7.5). Soil samples were incubated with Cu rates varying from 0 to 400 mg kg-1, during 4 and 12 weeks, in the presence of CaCl2 as support electrolyte at concentrations of 0.01 and 0.001 mol L-1. Complete soil adsorption of added Cu was observed at pH 7.5 in all incubation periods, indicating that a 24h-shaking period was enough to reach equilibrium and maximum adsorption. Copper adsorption varied with the incubation period and was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Copper; Desorption; Ionic strength; PH.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000200012

Repetibilidade de características forrageiras do capim-elefante
Provedor de dados: 63
Autores: Shimoya,Aldo; Pereira,Antônio Vander; Ferreira,Reinaldo de Paula; Cruz,Cosme Damião; Carneiro,Pedro Crescêncio Souza.
O coeficiente de repetibilidade é amplamente usado pelos geneticistas como medida do limite superior da herdabilidade e da eficiência da predição do valor genotípico a partir de sucessivas medições no indivíduo. Pelo seu conhecimento pode-se avaliar se o número de avaliações realizadas é suficiente para se inferir sobre a superioridade genotípica com determinado grau de certeza. Estimou-se o coeficiente de repetibilidade das características forrageiras proteína bruta do colmo e da folha, em 77 acessos do Banco Ativo de Germoplasma de Capim-Elefante da Embrapa. O delineamento experimental foi em blocos ao acaso com duas repetições. Os cortes foram realizados aos 30, 45, 60 e 75 dias de idade, em 15 perfilhos, tomados ao acaso dentro de cada parcela. Foi...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pennisetum purpureum; Variabilidade genética; Forragem; Cortes; Proteína bruta.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000200004

Herbicidas não seletivos aplicados na fase de maturação do arroz irrigado
Provedor de dados: 63
Autores: Agostinetto,Dirceu; Fleck,Nilson Gilberto; Menezes,Valmir Gaedke.
Um dos principais fatores limitantes da exploração do potencial máximo de rendimento do arroz irrigado é a interferência exercida pelo arroz vermelho, uma gramínea daninha. Botanicamente, ambos pertencem a mesma espécie (Oryza sativa L.), o que limita a utilização de herbicidas seletivos para seu controle. Com o objetivo de investigar os efeitos de herbicidas não seletivos, aplicados na fase de maturação do arroz cultivado, sobre características agronômicas da cultura, conduziu-se dois experimentos a campo nas estações de crescimento de 1997/98 e 1998/99, e avaliações em laboratório. Os tratamentos compararam os herbicidas glyphosate, glufosinate e paraquat, aplicados em duas doses e duas épocas, além do regulador de crescimento hidrazida maléica, aplicada...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Oryza sativa; Arroz vermelho; Dessecantes; Hidrazida maléica.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000200010

Truths and myths about the mushroom Agaricus blazei
Provedor de dados: 63
Autores: Dias,Eustáquio Souza; Abe,Carlos; Schwan,Rosane Freitas.
The mushroom Agaricus blazei Murrill was discovered in Piedade, state of São Paulo, Brazil, and sent to Japan to be studied for its medicinal properties. Studies in guinea pigs revealed antitumor properties, triggering Japanese importation of A. blazei from Brazil. Because of its high price on the international market, many companies and rural growers produce A. blazei as alternative crop to increase income, but because interest in this mushroom occurred suddenly there has not been enough time for the scientific community to investigate it and, technology used for its cultivation is still based on empirical rules. There are also some contradicting data regarding the classification of this mushroom, and its antitumor properties still need to be confirmed in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antitumor properties; Cogumelo do sol; Royal agaricus; Sun mushroom.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000500014

Produção e qualidade fisiológica de sementes de soja avaliadas na semeadura de inverno
Provedor de dados: 63
Autores: Crusciol,Carlos Alexandre Costa; Lazarini,Edson; Buzo,Cássio Luis; Sá,Marco Eustáquio de.
O cultivo da soja fora da época convencional pode ser uma alternativa de rotação de cultura além de proporcionar sementes de melhor qualidade fisiológica, que podem ser utilizadas na semeadura da próxima safra diminuindo o período de armazenamento. O trabalho de pesquisa teve por objetivo avaliar o comportamento de sete cultivares de soja, em três densidades populacionais, quanto ao porte e altura de inserção da primeira vagem, assim como quanto à produção e qualidade fisiológica das sementes, semeadas no período de inverno, na região de Selvíria-MS. O delineamento experimental foi em blocos casualizados, com quatro repetições, dispostos em esquema fatorial 7 ×3. Os tratamentos constaram de sete cultivares (IAC-16, IAC-Foscarin 31, FT-2, IAC-17, IAC-8,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Densidade populacional; Cultivares; Altura da primeira vagem; Armazenamento.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000100012

Routine soil testing to monitor heavy metals and boron
Provedor de dados: 63
Autores: Abreu,Cleide Aparecida de; van Raij,Bernardo; Abreu,Mônica Ferreira de; González,Antonio Paz.
Microelements are an important issue in agriculture, due to their need as micronutrients for plants and also to the possibility of the build-up of toxic levels for plants and animals. Five micronutrients (B, Cu, Fe, Mn, and Zn) are routinely determined in soil analysis for advisory purposes. Other four elements (Cd, Cr, Pb, and Ni) are considered environmentally important heavy metals in farmland soils. Thus high contents of these metals in cropland might go eventually unnoticed. In this paper we present an approach that can be used to monitor the contents of the nine elements in farmland soils using advisory soil testing. A total of 13,416 soil samples from 21 Brazilian states, 58% of them from the state of São Paulo, sent by farmers were analyzed. Boron...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil analyses; Micronutrients; Heavy metals; Deficiency; Toxicity; Interpretation limits.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000600009

Adubação da seringueira no período de pós enxertia. I: relacionada à data de decepagem do porta-enxerto
Provedor de dados: 63
Autores: Pereira,J. da P.; Lucchesi,A.A.; Silveira,R.I.
Com o objetivo de obter informações, que visem solucionar o grave problema de desuniformidade na brotação da gema do enxerto e do crescimento atrofiado desta após a decepagem da parte aérea do porta-enxerto, foram aplicados N e K na presença e ausência de P, em adubações regulares e variáveis, em diferentes datas antes e após a decepagem da parte aérea do porta-enxerto (mudas formadas diretamente em sacos de plástico). A adubação no período de pós-enxertia, mostrou-se extremamente necessária para o crescimento e vigor das mudas. Em relação à época, a adubação feita na data da decepagem do porta-enxerto, não apresentou resultados satisfatórios. A antecipação na emissão, uniformidade e vigor do 1° lançamento foliar, foram obtidos quando as plantas foram...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Seringueira; Adubação; Decepagem; Porta-enxerto; Pós-enxertia.
Ano: 1993
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161993000200006

Resposta de cultivares de arroz irrigado ao nitrogênio
Provedor de dados: 63
Autores: Freitas,José Guilherme de; Azzini,Luiz Ernesto; Cantarella,Heitor; Bastos,Cândido Ricardo; Castro,Lúcia Helena Signori Melo de; Gallo,Paulo Boller; Felício,João Carlos.
Genótipos de arroz irrigado por inundação (Oryza sativa L.) podem apresentar variabilidade de resposta ao nitrogênio. O objetivo deste trabalho foi avaliar a resposta de três cultivares de arroz ao nitrogênio. Os experimentos foram realizados em Mococa, SP, em 1997/98 e 1998/99, em Cambissolo Háplico Tb Eutrófico gleico. O delineamento estatístico foi em blocos ao acaso, em esquema de parcelas subdivididas, com quatro repetições. Nas parcelas foram aplicadas doses de N (0, 50, 100 e 150 kg ha-1) e nas subparcelas foram transplantadas mudas dos cultivares de arroz (IAC 101, IAC 102 e IAC 104). O nitrogênio foi aplicado parceladamente sendo 1/3 da dose no transplantio das mudas, 1/3 aos 20 dias e 1/3 aos 40 dias, após o transplantio. Os cultivares...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Oryza sativa; Variabilidade; Rendimento de grãos.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000300021

Biology of Microctonus sp. (Hymenoptera: Braconidae), a parasitoid of Cyrtomon luridus BOH. (Coleoptera: Ccurculionidae)
Provedor de dados: 63
Autores: Tironi,Paulo; von Treuenfels,Adrian; Parra,José Roberto Postali.
Cyrtomon luridus (Boh.), a native insect of wild Solanaceae, has adapted to the medicinal plant Duboisia sp., introduced from Australia, causing damages up to 100% mortality. Microctonus sp. is the most important natural enemy of C. luridus and its potential for biological control was investigated in this work. This study was carried out in Arapongas, Paraná State, Brazil, from 1994 to 1996. Parasitism of C. luridus by Microctonus sp. was highest from February through June (maximum of 54% in May 1996), when the C. luridus adult population was decreasing. The female sex ratio of Microctonus sp. under natural conditions was 0.57 to 0.69, which was close to 1 male : 2 female. Production of males occurs parthenogetically (arrhenotoky). In the laboratory,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biological control; Parasitism; Medicinal plant; Duboisia.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000500012

Utilization of nitrogen from green manure and mineral fertilizer by sugarcane
Provedor de dados: 63
Autores: Ambrosano,Edmilson José; Trivelin,Paulo Cesar Ocheuze; Cantarella,Heitor; Ambrosano,Gláucia Maria Bovi; Schammass,Eliana Aparecida; Guirado,Nivaldo; Rossi,Fabrício; Mendes,Paulo Cesar Doimo; Muraoka,Takashi.
Given their potential for biological nitrogen fixation, legumes used as green manure are an alternative source of nitrogen to crops, and can supplement or even replace mineral nitrogen fertilization. The utilization of nitrogen by sugarcane (Saccharum spp.) fertilized with sunn hemp (Crotalaria juncea L.) and ammonium sulphate (AS) was evaluated using the 15N tracer technique. Amounts of 195.8 kg and 70 kg N per hectare, respectively, of sunn hemp and AS were added in the following treatments: without green manure and without AS; without green manure, with AS -15N; with green manure-15N and with AS; with green manure-15N, without AS; with green manure and with AS-15N. Four samples from the leaves +3 were collected and 2 m of the sugar cane row were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Saccharum spp; Sunn hemp; 15N; Isotope technique.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000600004

Barium extraction potential by mustard, sunflower and castor bean
Provedor de dados: 63
Autores: Coscione,Aline Renée; Berton,Ronaldo Severiano.
Barium salts are used extensively for industrial purposes, generating residues that, if not appropriately disposed, can increase soil Ba content. The aim of the present work was to evaluate Ba extraction potential of mustard (Brassica juncea Czern.), sunflower (Helianthus annuus L.), and castor bean (Ricinus communis L.), grown in a soil artificially contaminated with increasing Ba additions. A greenhouse experiment was carried out by adding BaSO4 to a Rhodic Hapludox sample, at the 0, 150 and 300 mg kg-1 rates. After harvesting, the pot soil material was also analyzed for exchangeable Ba by CaCl2 extraction and by an ion exchange resin method. None of the plant species tested presented toxicity symptoms, decreased nutrient accumulation or decreased dry...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Toxicity; Phytoextraction; Fransference factor; Ion exchange resin; Exchangeable Ba.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000100008

Ecophysiological and anatomical changes due to uptake and accumulation of heavy metal in Brachiaria decumbens
Provedor de dados: 63
Autores: Gomes,Marcelo Pedrosa; Marques,Teresa Cristina Lara Lanza de Sá e Melo; Nogueira,Mariana de Oliveira Gonçalves; Castro,Evaristo Mauro de; Soares,Ângela Maria.
The growth and developmental characteristics of grasses and their high biodiversity make such plants suitable for remediation of areas contaminated by heavy metals. Nevertheless, heavy metal toxic effect on the plants may cause alteration in their metabolic pathways, such as photosynthesis, respiration, and growth, modifying plant anatomy. This work aimed to evaluate the effect of levels of soil contamination (0, 7.5 % and 15 % m³ m-3) on biomass production, on photosynthetic characteristics and on anatomical changes in roots and leaves of brachiaria (Brachiaria decumbens Stapf.). After seeds were planted, seedlings were uprooted and replanted in vases containing soil at different contamination levels, being left to rest for 120 days. At the end of that...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Contaminated soil; Chlorophyll; Growth; Potencial photosynthesis.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000500009

Nitrogenous compounds, phenolic compounds and morphological aspects of leaves: comparison of deciduous and semideciduous arboreal legumes
Provedor de dados: 63
Autores: Lima,Ana Lúcia da Silva; Zanella,Fábio; Schiavinato,Marlene Aparecida; Haddad,Claudia Regina Baptista.
In general, perennial species contain higher concentrations of certain secondary compounds, such as phenolics, lower levels of nitrogenous compounds, and greater specific leaf mass (SLM) than deciduous species. The aim of this study was to verify whether the comparative data reported in the literature regarding deciduous and evergreen species, also applies to four selected species of a semideciduous tropical forest (a remnant of the Atlantic Forest). The four species chosen for this study, each with apparently different leaf life spans, were two semideciduous (Hymenaea courbaril L. var. stilbocarpa (Hayne) Lee et Lang., and Lonchocarpus guilleminianus (Tul.) Malme, and two deciduous (Enterolobium contortisiliquum (Vell.) Morong., and Peltophorum dubium...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Leaf life span; Specific leaf mass; Total nitrogen; Tannins; Atlantic forest.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000100007

Isoenzymatic variability of cassava accessions from different regions in Brazil
Provedor de dados: 63
Autores: Cabral,Betânia Lúcia Rocha; Souza,Joelson Araújo de; Ando,Akihiko; Veasey,Elizabeth Ann; Cardoso,Eloisa Maria Ramos.
Cassava (Manihot esculenta Crantz) belongs to the Euphorbiaceae family, and is widely cultivated in Brazil. The objective of this study was to evaluate the isoenzymatic variability of 200 cassava accessions from the germplasm bank of Embrapa Amazonia Oriental. Seven groups were formed according to their origin: 1-Amazonas, 2-Amapa, 3-Bahia, 4-Para, 5-Rondonia, 6-Various, for accessions with a maximum of three individuals per place of origin, and 7 - Accessions of indefinite origin. The accessions were also evaluated as a whole. For the electrophoretic analyses, samples of young leaves were used in a 12% starch gel. Eight isoenzymatic systems were evaluated: acid phosphatase (ACP), leucine aminopeptidase (LAP), glucose-6-phosphate dehydrogenase (G6PDH),...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Manihot esculenta; Genetic variability; Germplasm bank; Isozymes.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000300017

Life table of Hypothenemus hampei (Ferrari) in relation to coffee berry phenology under Colombian field conditions
Provedor de dados: 63
Autores: Ruiz-Cárdenas,Ramiro; Baker,Peter.
The overlap of generations of coffee berry borer (CBB), Hypothenemus hampei (Ferrari) under field conditions in countries like Colombia hinders the construction of life tables by the sampling of natural populations. In this paper, a field methodology to carry out regular measurements of CBB cohorts inside coffee berries of different ages until harvest, both in coffee trees and in infested berries placed on the ground, is developed and used to compare the life history parameters of CBB. Populations with berries at six ages in three experimental stations (without CBB control) and in a commercial farm in Colombia (with chemical CBB control regularly carried out) were used. The duration of the pre-oviposition period as well as the mortality and survival rates...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coffee berry borer; Population parameters; Integrated pest management.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000600007

Strawberry fruit resistance to simulated handling
Provedor de dados: 63
Autores: Ferreira,Marcos David; Sargent,Steven Alonzo; Brecht,Jeffrey Karl; Chandler,Craig Kellman.
Harvest operations are currently the main source of mechanical injury of strawberry (Fragaria x ananassa Duch.). Experiments were designed to simulate conditions encountered during commercial handling. Individual fruits were subjected to impact or compression forces with similar energy to determine the sensitivity to mechanical injury. Bruise volume was used as the measurement of injury. Bruise severity increased as a function of impact energy for both impact types. However, dropped fruits had larger bruise volume than fruits submitted to pendulum impactor at the same energy level. Doubling the impact energy (0.040 to 0.083 J) increased bruise volume by 7 times (13 to 91 mm³). Fruits dropped from 380 mm (0.075 J) showed 71% greater bruise volume than those...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fragaria x ananassa Duch.; Impact; Compression; Injury; Grading.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000500007

Pedotransfer functions to estimate bulk density from soil properties and environmental covariates: Rio Doce basin
Provedor de dados: 63
Autores: Souza,Eliana de; Fernandes Filho,Elpídio Inácio; Schaefer,Carlos Ernesto Gonçalves Reynaud; Batjes,Niels H.; Santos,Gerson Rodrigues dos; Pontes,Lucas Machado.
ABSTRACT Soil bulk density (ρb) data are needed for a wide range of environmental studies. However, ρb is rarely reported in soil surveys. An alternative to obtain ρb for data-scarce regions, such as the Rio Doce basin in southeastern Brazil, is indirect estimation from less costly covariates using pedotransfer functions (PTF). This study primarily aims to develop region-specific PTFs for ρb using multiple linear regressions (MLR) and random forests (RF). Secondly, it assessed the accuracy of PTFs for data grouped into soil horizons and soil classes. For that purpose, we compared the performance of PTFs compiled from the literature with those developed here. Two groups of data were evaluated as covariates: 1) readily available soil properties and 2) maps...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Multiple linear regressions; Random forests; Soil predictors; Spatial prediction.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000600525

Agroforestry systems, nutrients in litter and microbial activity in soils cultivated with coffee at high altitude
Provedor de dados: 63
Autores: Notaro,Krystal de Alcantara; Medeiros,Erika Valente de; Duda,Gustavo Pereira; Silva,Aline Oliveira; Moura,Patrícia Maia de.
Agroforestry systems are an alternative option for sustainable production management. These systems contain trees that absorb nutrients from deeper layers of the soil and leaf litter that help improve the soil quality of the rough terrain in high altitude areas, which are areas extremely susceptible to environmental degradation. The aim of this study was to characterize the stock and nutrients in litter, soil activity and the population of microorganisms in coffee (Coffea arabica L.) plantations under high altitude agroforestry systems in the semi-arid region of the state of Pernambuco, Brazil. Samples were collected from the surface litter together with soil samples taken at two depths (0-10 and 10-20 cm) from areas each subject to one of the following...
Tipo: Info:eu-repo/semantics/article
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162014000200001

Lettuce genotype resistance to "soft rot" caused by Pectobacterium carotovorum subsp. carotovorum
Provedor de dados: 63
Autores: Felix,Kátia Cilene da Silva; Oliveira,Willams José de; Mariano,Rosa de Lima Ramos; Souza,Elineide Barbosa de.
Soft rot, caused by Pectobacterium carotovorum subsp. carotovorum (Pcc), is the main bacterial disease affecting lettuce (Lactuca sativa L.) crops in Brazil and leads to significant yield losses. This study aimed to assess the reaction of lettuce genotypes to soft rot induced by a virulent isolate and the stability of the resistance to three isolates varying in virulence. Using a descriptive ordinal scale ranging from 1 to 9 a classification system was defined: class 1 = resistant (R): severity (Sev) &lt; 1.5; class 2 = moderately resistant (MR): 1.5 &lt; Sev &lt; 2.5; class 3 = susceptible (S): 2.5 &lt; Sev &lt; 3.5; class 4 = highly susceptible (HS): Sev &amp;gt; 3.5). Of the 41 tested genotypes, 14 were classified as MR and 27 as S when inoculated with...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lactuca sativa; Bacterial; Disease control.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162014000400005

Estimação e predição por modelo linear misto com ênfase na ordenação de médias de tratamentos genéticos
Provedor de dados: 63
Autores: Duarte,João Batista; Vencovsky,Roland.
O presente artigo propôs-se a refletir teoricamente o processo de estimação/predição de médias de tratamentos, nos delineamentos em blocos, com ênfase nas suas aplicações em testes de genótipos, no melhoramento vegetal. Neste sentido, procurou-se comparar as análises baseadas no modelo linear fixo (análise intrablocos) e no modelo linear misto com genótipos aleatórios (análise recuperando informação intertratamentos), buscando identificar os fatores que podem determinar diferentes classificações genotípicas. A análise teórica permitiu constatar que a abordagem de modelo misto (com tratamentos aleatórios), comparativamente às análises tradicionais (médias marginais e análise intrablocos), em geral, leva a: i) maior homogeneidade das médias de tratamentos; e...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Recuperação de informação; Delineamento em bloco; Média BLUP; Seleção genotípica; Ordenamento.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000100017

Cereus jamacaru seed germination and initial seedling establishment as a function of light and temperature conditions
Provedor de dados: 63
Autores: Alencar,Nara Lídia Mendes; Gomes-Filho,Enéas; Innecco,Renato.
Cereus jamacaru is a widespread Cactaceae of northeast Brazil, largely used as cattle food, and as ornamental and medicinal plant. Despite its distinguished importance, until now, there has been little information about the physiological aspects involved on its germination. The objective of this study was to evaluate the effect of light and temperature interaction on the seed germination and seedling establishment of this plant. The evaluated variables were germination percentage at 7 (% G7) and at 14 days after imbibition (% G14), germination average time index (GSI), germination average time (GAT), germination accumulated frequency (GAF), seedling dry mass and height. The highest % G14 and GSI were at 25 ºC in white light, whereas the highest GAT values...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cactus seed; Germination percentage; Mandacaru; Photoblastism.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162012000100010

Meyer and schilz function to estimate common bean seed water content evaluated by radiofrequency
Provedor de dados: 63
Autores: Berbert,Pedro Amorim; Molina,Marília Berbert; Viana,Alexandre Pio; Carlesso,Vinícius de Oliveira; Oliveira,Marcia Terezinha Ramos de.
Derivation of density-independent dielectric functions for moisture determination in grains is important for the implementation of on-line sensors in automated driers. The object of this study was to investigate the Meyer and Schilz function [(epsilon'1)/epsilon"] for indirect and non-destructive water content measurement of seeds of common bean by radiofrequency, where epsilon' and epsilon" are the relative permittivity and the dielectric loss factor, respectively. Samples consisted of common bean seeds variety Campeão-3 at moisture contents ranging from 11.5 to 20.6% w.b., and bulk densities from 756 to 854 kg m-3, performing dielectric measurements in a room at 20 ± 1ºC and 66 ± 2% relative humidity. The model could estimate common bean seed moisture...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dielectric properties; Grain drying; Bulk density; Automatic control.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000600002

Emerging soil measurement techniques at the microscale
Provedor de dados: 63
Tipo: Info:eu-repo/semantics/article
Ano: 1997
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161997000300006

Cálcio e o desenvolvimento de aerênquimas e atividade de celulase em plântulas de milho submetidas a hipoxia
Provedor de dados: 63
Autores: Dantas,Bárbara França; Aragão,Carlos Alberto; Alves,José Donizeti.
A formação de aerênquimas é conhecida como uma das mais importantes adaptações anatômicas pelas quais as plantas passam quando são submetidas à deficiência de oxigênio. Esse tecido se desenvolve pela ação de enzimas de degradação ou afrouxamento da parede celular. Este trabalho foi conduzido com o objetivo de verificar o desenvolvimento de aerênquima em plântulas de milho cv. Saracura- BRS 4154, submetidas à hipoxia. Associou-se, ao desenvolvimento dessa estrutura, a atividade da celulase. Para tanto, plântulas com 4 dias de idade foram submetidas aos tratamentos de hipoxia, pela imersão em tampão de alagamento, na ausência e presença de cálcio. Após 0, 1, 2, 3 e 4 dias da aplicação dos tratamentos, foram feitos cortes anatômicos na região apical dos...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays; Celulase; Parede celular; Cálcio.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000200006

Morphological, behavioral and biological aspects of Azya luteipes Mulsant fed on Coccus viridis (Green)
Provedor de dados: 63
Autores: Nais,Juliana; Busoli,Antonio Carlos.
One of the major pests of nursery seedlings of coffee (Coffea arabica L.) is the green scale, Coccus viridis (Green) (Hemiptera: Coccidae). The main predators of this species are beetles of the family Coccinellidae, especially Azya luteipes Mulsant. Morphological, behavioral and biological aspects of A. luteipes feeding on C. viridis on coffee plants were examined under laboratory conditions. Tests were conducted in room temperature at 28 ± 2 ºC. A. luteipes oviposits on the underside of the scale's body, laying two to four eggs per insect. The eggs have a subelliptical form and a white-clear color, and the incubation period is 8.3 ± 1.2 days. The number of eggs laid per female per day varies between eight and ten. A. luteipes undergoes four larval instars...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coccinelids; Green scale; Development; Oviposition behavior; Life cycle.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162012000100012

Copper, nickel and zinc phytoavailability in an oxisol amended with sewage sludge and liming
Provedor de dados: 63
Autores: Martins,Adão Luiz Castanheiro; Bataglia,Ondino Cleante; Camargo,Otávio Antonio de.
Contents of heavy metal on agricultural soils have been raised by land applications of sewage sludge and may constitute a hazard to plants, animals and humans. A field experiment was carried out from 1983 to 1987, to evaluate the long-term effect of sewage sludge application, with and without liming, on heavy metal accumulation and availability in a Rhodic Hapludox soil grown with maize (HMD 7974 hybrid). Trials were set up in a completely randomized blocks design with four replications. Each block was split in two bands, one with and another without liming. The sludge was applied in each band at rates: 0, 20, 40, 60 and 80 Mg ha-1 (dry basis) in a single application; and 40, 60 and 80 Mg ha-1 split in two, three and four equal yearly applications,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: DTPA; Mehlich-3; Heavy metals; Extractability; Corn.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000400021

Precision production environments for sugarcane fields
Provedor de dados: 63
Autores: Sanches,Guilherme Martineli; Paula,Maria Thereza Nonato de; Magalhães,Paulo Sérgio Graziano; Duft,Daniel Garbellini; Vitti,André César; Kolln,Oriel Tiago; Borges,Bernardo Melo Montes Nogueira; Franco,Henrique Coutinho Junqueira.
ABSTRACT: Sugarcane (saccharum spp.) in Brazil is managed on the basis of “production environments”. These “production environments” are used for many purposes, such as variety allocation, application of fertilizers and definition of the planting and harvesting periods. A quality classification is essential to ensure high economic returns. However, the classification is carried out by few and, most of the time, non-representative soil samples, showing unreal local conditions of soil spatial variability and resulting in classifications that are imprecise. One of the important tools in the precision agriculture technological package is the apparent electrical conductivity (ECa) sensors that can quickly map soil spatial variability with high-resolution and at...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Proximal soil sensors; Site-specific soil management; Soil apparent electrical conductivity; Precision agriculture technologies.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162019000100010

Selection of Metarhizium anisopliae (Metsch.) and Beauveria bassiana (Bals.) isolates to control Alabama argillacea (Huebner) caterpillars
Provedor de dados: 63
Autores: César Filho,Everardo; Marques,Edmilson Jacinto; Barros,Reginaldo.
The cotton leafworm, Alabama argillacea (Huebner, 1818) (Lepidoptera: Noctuidae), is considered to be one of the key pests in herbaceous cotton (Gossypium hirsutum L. r. latifolium Hutch) cropping, with constant occurrence in all cotton-growing states of Brazil. In this study Metarhizium anisopliae and Beauveria bassiana isolates were screened and evaluated for pathogenicity against Alabama argillaceae. Initially, a screening of ten isolates of each fungus in a concentracion of 10(8) conidia mL-1, was carried out on 3rd instar larvae of A. argillacea. Further studies were conducted to determine the pathogenicity and virulence of six and seven isolates of M. anisopliae and B. bassiana, respectively, against 3rd instar larvae of A. argillacea and using the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Entomopathogenic fungus; Cotton leafworm; Microbial control.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000300008

First report of Hypsipyla grandella (Lepidoptera: Pyralidae) on African mahogany Khaya ivorensis
Provedor de dados: 63
Autores: Zanetti,Ronald; Abreu,Caroline Silva; Silveira,Stephannie Hellinet Prado; Andrade,Eliana Donizete.
ABSTRACT The mahogany shoot borer Hypsipyla grandella Zeller is an important economic pest in all American tropical forests, because it prevents monoculture of valuable timber trees species like mahogany and cedar. The shoot borer damages several tree structures, especially the apical shoots, impairing the formation of the commercial stem. This pest can attack the plants during the year and one larva per plant is enough to cause significant damage. In infested areas, the attack can reach up to 100 % of the trees. The Australian cedar and African mahogany have been cultivated in Brazil for timber production, because they are considered resistant to H. grandella (Lepidoptera: Pyralidae) attack. However, in this work we report for the first time the H....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Meliaceae; Mahogany shoot borer; Resistance; Forest pest.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162017000600492

Pinus afforestation in South Brazilian highlands: soil chemical attributes and organic matter composition
Provedor de dados: 63
Autores: Dick,Deborah Pinheiro; Leite,Simone Benvenuti; Dalmolin,Ricardo Simão Diniz; Almeida,Henrique Cesar; Knicker,Heike.
In the last three decades, exotic tree species are being introduced in the natural pastures of the highlands located at the northeastern part of Rio Grande do Sul State (RS), Brazil. This alteration of land use may impart drastic changes in the soil attributes. In this context, this work aimed to evaluate the impact of Pinus taeda afforestation on soil chemical attributes and organic matter (SOM) composition in Leptosols from Campos de Cima da Serra, RS. Soil samples under eight year old (Pi8) and 30 year old (Pi30) Pinus plantations and under native pasture (NP) were studied. Contents of exchangeable cations and of micronutrients and soil pH were determined. The SOM composition was investigated by means of elemental analyses and FTIR spectroscopy. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: FTIR spectroscopy; Humification; Exchangeable cation; Pastures; Recalcitrance.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000200007

IDENTIFICAÇÃO DE LEVEDURAS NO PROCESSO DE FERMENTAÇÃO ALCOÓLICA EM USINA DO ESTADO DE SÃO PAULO, BRASIL
Provedor de dados: 63
Autores: Cabrini,Katia Teresinha; Gallo,Claudio Rosa.
Com o objetivo de se obter um levantamento das espécies de leveduras presentes no processo de fermentação para a produção de álcool, procedeu-se a identificação de leveduras durante um semestre da safra 94/95 na Usina da Pedra no município de Serrana - SP, utilizando-se amostras de caldo primário, mosto e leite de leveduras coletadas mensalmente. A identificação das leveduras isoladas foi realizada de acordo com a taxonomia numérica proposta por Griffiths (1981), sendo que 72 leveduras, pertencentes a 5 gêneros foram identificadas. A espécie Saccharomyces cerevisiae: S. uvarum (S. cerevisiae) foi a levedura dominante na unidade industrial pesquisada e o gênero Saccharomyces, o de maior incidência.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Leveduras; Fermentação; Álcool; Identificação; Contaminação.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000100028

Energy balance and evapotranspiration of melon grown with plastic mulch in the Brazilian semiarid region
Provedor de dados: 63
Autores: Borges,Valéria Peixoto; Silva,Bernardo Barbosa da; Espínola Sobrinho,José; Ferreira,Rafael da Costa; Oliveira,Alexsandra Duarte de; Medeiros,José Francismar de.
Melon plants (Cucumis melo L.) are grown in the state of Rio Grande do Norte (RN), the largest producer of melons in Brazil, with plastic mulch and agrotextiles. Studies of crop evapotranspiration (ET) under these conditions are required to ensure adequate irrigation. This study aimed to determine the crop coefficients (Kc) of irrigated melon plants grown with mulch and agrotextiles in the region of Mossoró, RN, based on the Bowen Ratio Energy Balance (BREB) method. Two experiments were conducted at different times during the 2009/2010 season in a melon producing area (4°59'52" S, 37°23'09" W, and 54 m elevation) to define ET and Kc. Due to the plastic cover and reduced precipitation during the experiments, the Kc obtained by the BREB method was considered...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cucumis melo (L.); Bowen Ratio; Crop coefficients.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162015000500385

Phyllochron of Paspalum notatum FL. and Coelorhachis selloana (HACK.) camus in natural pasture
Provedor de dados: 63
Autores: Eggers,Lilian; Cadenazzi,Mónica; Boldrini,Ilsi Iob.
Leaf appearance rate and phyllochron are related variables which play a central role in forage production. Phyllochron is the time interval between the appearance of successive leaves and varies according to a number of environmental factors, among which temperature is the most important. The experiment was conducted in natural pasture with the aim of testing phyllochron variation under different seasons, herbage allowances, and topographic positions. Marked tillers were used to define the phyllochron, establishing a relationship between the number of leaves produced against thermal time during the sampling period. The time (expressed in °C) needed for the emergence of a leaf is equal to 1/b, where b is the slope coefficient of the regression. The lines...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Morphogenesis; Leaf appearance; Native grassland.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000400001

Calibration of cardy-ion meters to measure nutrient concentrations in soil solution an in plant sap
Provedor de dados: 63
Autores: Folegatti,Marcos Vinícius; Blanco,Flávio Favaro; Boaretto,Rodrigo Marcelli; Boaretto,Antônio Enedi.
Fertigation management requires rapid and accurate methods to determine nutrient concentrations in soil solution and in plant sap. This study was developed to evaluate the performance of cardy-ion meters (CIM) for the determinations of NO3-, K+ and Na+ concentrations in soil solution and tomato plant sap, for fertigation management purposes. Tomato was cultivated in a greenhouse with different levels of N, K and Na in the irrigation water. Soil solution was collected by suction at the 15 cm depth with porous ceramic cups and the concentrations of NO3-, K+ and Na+ were determined by CIM and also in the laboratory by standard methods. At the end of the cropping season, 50 leaf samples were also collected and concentrations of the nutrients in the petiole sap...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ion electrodes; Fertigation; Mineral nutrition; Soil solution extractor; Tomato.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000100002

Lysine metabolism and amino acid profile in maize grains from plants subjected to cadmium exposure
Provedor de dados: 63
Autores: Kato,Fabiana Hibary; Carvalho,Marcia Eugenia Amaral; Gaziola,Salete Aparecida; Piotto,Fernando Angelo; Azevedo,Ricardo Antunes.
ABSTRACT: In general, the effects of Cadmium (Cd) on crop quality are evaluated solely by Cd accumulation in the edible plant parts; thus, the potential effects on several nutritional features are not often taken into account. This study evaluated Cd effects on the enzymatic activities of lysine (Lys) metabolism, storage protein and amino acid profile in maize. Stress parameters were also assessed. In vegetative organs, Cd was accumulated in the following decreasing order: roots &gt; stems &gt; leaves. Cadmium accumulation in grains decreased at grain maturity (from 0.25 to 0.07 µg g−1 DW). In leaves, neither hydrogen peroxide content nor superoxide dismutase, catalase, ascorbate peroxide and guaiacol peroxidase activities did not change in Cd-treated...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays L.; Aspartate kinase; Corn; Dihydrodipicolinate synthase; Heavy metal.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000101300

Mixture of formic and propionic acid as additives in broiler feeds
Provedor de dados: 63
Autores: Vale,Marcos Martinez do; Menten,José Fernando Machado; Morais,Sônia Cristina Daróz de; Brainer,Mônica Maria de Almeida.
The presence of Salmonella species in feeds and ingredients is an important source of salmonella contamination for animals. Organic acid mixtures have shown to be an effective alternative to eliminate salmonellas in feeds and chickens. In the present study, the performance of male broiler chickens receiving levels (0, 0.25, 0.50, 1.0 and 2.0%) of a mixture of organic acids (OAs) (70% formic acid and 30% propionic acid) in the diet was evaluated from the age one to 42 days, in a completely randomized experimental design with five treatments and five replications of 40 birds each. Diets were based on corn, soybean meal and soybean oil. Body weight, weight gain and feed intake from the age one to 21 days were affected by the treatments; 2% OAs in the diet...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Salmonella; Chicken; Organic acids; Food safety.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000400004

Percolação e o fenômeno epidêmico: uma abordagem temporal e espacial da difusão de doenças
Provedor de dados: 63
Autores: SANTOS,C.B. dos; BARBIN,D.; CALIRI,A.
O fenômeno da difusão epidêmica é considerado tanto no aspecto temporal quanto geográfico. A dinâmica populacional é descrita através da simulação Monte Carlo e a idéia de conectividade é utilizada na construção da analogia entre o fenômeno epidêmico e o da percolação, envolvendo coordenadas espaciais. O modelo estudado considera uma população idealizada, disposta em uma rede bidimensional e o mecanismo de espalhamento da doença, essencialmente estocástico, processa-se através de contatos efetivos entre vizinhos adjacentes. Vários graus de vizinhança e de heterogeneidade espacial, envolvendo diferentes concentrações de imunes e susceptíveis, foram considerados. Uma generalização do conceito de percolação é utilizada como instrumento de medida,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Resistência à doenças; Simulação Monte Carlo; Percolação.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000300010

Spatial variability of soil CO2 emission in a sugarcane area characterized by secondary information
Provedor de dados: 63
Autores: Teixeira,Daniel De Bortoli; Bicalho,Elton da Silva; Panosso,Alan Rodrigo; Cerri,Carlos Eduardo Pellegrino; Pereira,Gener Tadeu; Scala Júnior,Newton La.
Soil CO2 emission (FCO2) is governed by the inherent properties of the soil, such as bulk density (BD). Mapping of FCO2 allows the evaluation and identification of areas with different accumulation potential of carbon. However, FCO2 mapping over larger areas is not feasible due to the period required for evaluation. This study aimed to assess the quality of FCO2 spatial estimates using values of BD as secondary information. FCO2 and BD were evaluated on a regular sampling grid of 60 m × 60 m comprising 141 points, which was established on a sugarcane area. Four scenarios were defined according to the proportion of the number of sampling points of FCO2 to those of BD. For these scenarios, 67 (F67), 87 (F87), 107 (F107) and 127 (F127) FCO2 sampling points...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Geostatistics; Cokriging; Ordinary kriging; Cross-variogram.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162013000300008

Biosurfactants synthesized by endophytic Bacillus strains as control of Moniliophthora perniciosa and Moniliophthora roreri
Provedor de dados: 63
Autores: Serrano,Lizette; Moreno,Andrea Sosa; Castillo,Daynet Sosa Del; Bonilla,Julio; Romero,Christian A; Galarza,Luis Lenin; Coronel–León,Jonathan Ricardo.
ABSTRACT: Ecuador is responsible for up to 70 % of the world’s production of fine flavor cocoa. Although fungal diseases have reduced cocoa production, eco–friendly alternatives have been implemented to control the spread of phytopathogens. This study aimed to explore the potential of endophytic strains isolated from fine flavor Nacional cocoa trees to synthetize compounds with antimicrobial and surface active properties. It was determined that under in vitro conditions, seven strains (DS03, DS07, DS18, DS23, DS31, DS34 and DS50) exhibited antifungal activity that inhibited the mycelial growth of Moniliophthora roreri and Moniliophthora perniciosa. The strains were identified based on their morphological (pattern forming Bacilli) and genetic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antimicrobial biosurfactant; Biocontrol; Cocoa; Endophytes microorganisms.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000700201

Protein sources and digestive enzyme activities in jundiá (Rhamdia quelen)
Provedor de dados: 63
Autores: Lazzari,Rafael; Radünz Neto,João; Pedron,Fabio de Araújo; Loro,Vania Lucia; Pretto,Alexandra; Gioda,Carolina Rosa.
Digestive enzymes activity influence feed utilization by fish, and its understanding is important to optimize diet formulation. This study reports the digestive enzyme activities of jundiá juveniles fed diets with protein sources. Fish were fed six experimental diets for 90 days: MBY (meat and bone meal + sugar cane yeast), SY (soybean meal + sugar cane yeast), S (soybean meal), MBS (meat and bone meal + soybean meal), FY (fish meal + sugar cane yeast) and FS (fish meal + soybean meal), and then sampled every 30 days and assayed in two intestine sections for digestive enzymes - trypsin, chymotrypsin and amylase - activities; gastric protease was assayed in the stomach. Digestive and hepatosomatic index, intestinal quotient, digestive tract length and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Digestion; Nutrition; Soybean meal; Meat and bone meal; Fish meal.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000300002

Changes in bacterial community of soil induced by long-term straw returning
Provedor de dados: 63
Autores: Chen,Yanling; Xin,Li; Liu,Jintao; Yuan,Mingzhang; Liu,Shutang; Jiang,Wen; Chen,Jingpei.
ABSTRACT: Straw returning is an effective way to improve soil quality. Whether the bacterial community development has been changed by long-term straw returning in non-calcareous soil is not clear. In this study, the following five treatments were administered: soil without fertilizer (CK); wheat and corn straw returning (WC); wheat straw returning with 276 kg N ha−1 yr−1 (WN); manure, 60,000 kg ha−1 pig manure compost (M) and wheat and corn straw returning with 276 kg N ha−1 yr−1 (WCN). The high-throughput 16S rRNA sequencing technology was used to evaluate the bacterial communities. The results showed that the community was composed mostly of two dominant groups (Proteobacteria and Acidobacteria). Bacterial diversity increased after the application of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Long-term experiment; Soil quality; Soil bacterial composition.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162017000500349

Efeitos de reguladores vegetais no desenvolvimento e na produtividade do amendoinzeiro (Arachis hypogaea L.)
Provedor de dados: 63
Autores: Castro,P.R.C.; Appezzato-da-Glória,B.
O trabalho foi realizado com o objetivo de determinar a ação de substâncias de crescimento no desenvolvimento e produtividade do amendoinzeiro, sob condições de casa de vegetação. Plantas de Arachis hypogaea cv. Tatu-53, providas de 4 folhas definitivas, foram pulverizadas com chlormequat 2000 ppm, daminozide 4000 ppm, ácido giberélico 100 ppm, ácido indolilacético 100 ppm, além do controle. Foram determinados: altura das plantas, número de hastes, número de entrenós, comprimento do segundo e quarto entrenós, e o número de folhas. Também foram verificados os números de flores, de frutos e de sementes; peso dos frutos, das sementes, da matéria seca da parte aérea e da matéria seca das raízes do amendoinzeiro. Os resultados obtidos revelaram que daminozide...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Reguladores de crescimento; Amendoinzeiro.
Ano: 1993
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161993000200003

Soil moisture calibration of TDR multilevel probes
Provedor de dados: 63
Autores: Serrarens,Daniel; MacIntyre,Jim L.; Hopmans,Jan W.; Bassoi,Luis H.
Time domain reflectometry (TDR) probes are increasingly used for field estimation of soil water content. The objective of this study was to evaluate the accuracy of the multilevel TDR probe under field conditions. For this purpose, eight such TDR probes were installed in small plots that were seeded with beans and sorghum. Data collection from the probes was such that soil moisture readings were automated and logged using a standalone field unit. Neutron probe measurements were used to calibrate the TDR probes. Soil-probe contact and soil compaction were critical to the accuracy of the TDR, especially when a number of TDR probes are combined for a single calibration curve. If each probe is calibrated individually, approximate measurement errors were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: TDR; Soil water content; Neutron probe.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000200024

RESISTÊNCIA DE Colletotrichum fragariae E C. acutatum AO BENOMYL NA CULTURA DO MORANGO NO ESTADO DE SÃO PAULO
Provedor de dados: 63
Autores: TANAKA,M.A.S.; PASSOS,F.A.; BETTI,J.A.
O fungicida benomyl, utilizado intensivamente na cultura do morango a partir do final da década de 60, tem sido ineficiente para o controle da flor preta, causada por Colletotrichum acutatum, devido ao aparecimento de formas resistentes ao fungicida, já detectadas desde 1984. Para C. fragariae, no entanto, não há registro de ocorrência de resistência no Estado de São Paulo, embora venha se observando há alguns anos que o produto não tem apresentado resultados satisfatórios para o controle da podridão do rizoma ("chocolate"). Para verificar a ocorrência de resistência em C. fragariae foram testados 22 isolados, coletados em diversas regiões produtoras de morango do Estado de São Paulo, e 22 isolados de C. acutatum, para comparação. Todos os isolados de C....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Morango; Fragaria X ananassa; Antracnose; Fungicida; Benomyl; Resistência; Fungo.
Ano: 1997
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161997000200005

Polymer coating, germination and vigor of broccoli seeds
Provedor de dados: 63
Autores: Almeida,Celina de; Rocha,Sandra Cristina dos Santos; Razera,Luiz Fernandes.
Brassica oleracea var italica occupies a special place in the internal and external market of vegetables seeds. Vegetables producers demand seeds with high degree of purity, germination and vigor, since seeds' quality is the basis for the success of the production. In this work, broccoli seeds were coated in a spouted bed, by an aqueous suspension of hidroxy-ethyl-cellulose. Effects of the operating variables: spouting air temperature, atomizing air pressure and coating suspension flow rate over the dependent variables: seeds germination, seeds accelerated aging and the speed of seeds germination in soil, were investigated in a factorial scheme trial. The maximum processing time was 120 min. A totally randomized experiment evaluated and compared seeds...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hydroxyl-ethyl-cellulose; Seed coating; Spouted bed.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000300004

Extratos aquosos de Trichilia pallida e a traça-do-tomateiro
Provedor de dados: 63
Autores: Thomazini,Ariane Paes de Barros Werckmeister; Vendramim,José Djair; Lopes,Maria Teresa do Rêgo.
Avaliou-se o efeito de extratos aquosos de folhas e de ramos da planta inseticida Trichilia pallida sobre o desenvolvimento e oviposição da traça-do-tomateiro, Tuta absoluta. Acompanhou-se o desenvolvimento do inseto em folhas de tomateiro (Lycopersicon esculentum, cv. Santa Clara) previamente submersas nos extratos nas concentrações de 0,1; 1,0 e 5,0%. Também foi avaliado o efeito dos extratos de folhas a 1,0 e 5,0%, pulverizados sobre ovos do inseto, e a não-preferência para oviposição, com chance de escolha, em folhas de tomateiro com e sem esse extrato a 5%. Verificou-se que os extratos de folhas e de ramos prejudicam o desenvolvimento do inseto afetando principalmente a fase larval, aumentando a duração e reduzindo a viabilidade deste período. O...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Tuta absoluta; Trichilia pallida; Traça-do-tomateiro; Tomate; Planta inseticida.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000100004

AVALIAÇÃO QUÍMICA DE CORRETIVOS DE ACIDEZ PARA FINS AGRÍCOLAS: UMA NOVA PROPOSIÇÃO
Provedor de dados: 63
Autores: ALCARDE,J.C.; RODELLA,A.A.
Foi estudado o efeito da granulometria nas determinações do poder de neutralização, do cálcio e do magnésio de corretivos da acidez de solos. É sugerido um procedimento alternativo simplificado para avaliação química desses corretivos, fundamentado em: (1) uso de amostras moídas e passadas em peneira nº 100-ABNT; (2) emprego de um método de determinação do poder de neutralização através da titulação com indicador, de uma alíquota de um extrato diluído, e (3) determinação do cálcio e do magnésio no mesmo extrato obtido para a determinação do poder de neutralização. Esses procedimentos, além de simplificarem a metodologia analítica, permitiriam uma interpretação agronômica mais adequada.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Corretivos de acidez; Avaliação química; Procedimento simplificado; PRNT.
Ano: 1996
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161996000200003

Erratum
Provedor de dados: 63
Tipo: Info:eu-repo/semantics/article
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000500018

Propagação da goiabeira serrana Feijoa sellowiana Berg, através da mergulhia de cepa
Provedor de dados: 63
Autores: Fachinello,J.C.; Nachtigal,J.C.
Este trabalho teve como objetivo verificar a influência de três tipos de mergulhia de cepa na obtenção de novas plantas de Feijoa sellowiana Berg. Para isso, foi conduzido experimento na EMBRAPA-CNPFT, Pelotas-RS, durante o período de agosto de 90 a julho de 91. Foram utilizados como tratamentos: T1 -corte total da planta a l0cm do nível do solo, seguido de amontoa; T2 - Sem corte da planta, seguido de amontoa a 20 cm de altura e T3 - corte total da planta a 10 cm do nível do solo e amontoa com terra a 20 cm de altura, 2 meses depois do corte. Os parâmetros avaliados foram: número de brotos emitidos por planta; número de brotos enraizados por plantas; número de raízes por broto e vigor dos brotos, representado pelas medidas do comprimento total e diâmetro...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Feijoa; Mergulhia; Enraizamento.
Ano: 1992
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161992000400007

Invertase and sucrose synthase activities in coffee plants sprayed with sucrose solution
Provedor de dados: 63
Autores: Silva,José Carlos da; Alves,José Donizeti; Alvarenga,Amauri Alves de; Magalhães,Marcelo Murad; Livramento,Dárlan Einstein do; Fries,Daniela Deitos.
One management practice of which the efficiency has not yet been scientifically tested is spraying coffee plants with diluted sucrose solutions as a source of carbon for the plant. This paper evaluates the effect of foliar spraying with sugar on the endogenous level of carbohydrates and on the activities of invertase and sucrose synthase in coffee (Coffea arabica L.) seedlings with reduced (low) and high (normal) levels of carbon reserve. The concentrations used were 0.5 and 1.0% sucrose, and water as a control. The use of sucrose at 1.0% caused an increase in the concentration of total soluble sugars in depauperate plants, as well as increased the activity of the following enzymes: cell wall and vacuole acid invertase, neutral cytosol invertase and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coffea arabica L.; Sugar; Spray; Enzymes.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000200006

Heavy metals in vegetables and potential risk for human health
Provedor de dados: 63
Autores: Guerra,Fernando; Trevizam,Anderson Ricardo; Muraoka,Takashi; Marcante,Nericlenes Chaves; Canniatti-Brazaca,Solange Guidolin.
Ingestion of vegetables containing heavy metals is one of the main ways in which these elements enter the human body. Once entered, heavy metals are deposited in bone and fat tissues, overlapping noble minerals. Slowly released into the body, heavy metals can cause an array of diseases. This study aimed to investigate the concentrations of cadmium, nickel, lead, cobalt and chromium in the most frequently consumed foodstuff in the São Paulo State, Brazil and to compare the heavy metal contents with the permissible limits established by the Brazilian legislation. A value of intake of heavy metals in human diets was also calculated to estimate the risk to human health. Vegetable samples were collected at the São Paulo General Warehousing and Centers Company,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Contamination; Food chain; Potentially toxic element; Daily intake; Consumption habit.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162012000100008

Ciclo biológico, exigências térmicas e parasitismo de Muscidifurax uniraptor em pupas de mosca doméstica
Provedor de dados: 63
Autores: Thomazini,Marcílio José; Berti Filho,Evôneo.
Os parasitóides pupais estão entre os principais responsáveis pela redução populacional de mosca doméstica em aviários, e Muscidifurax uniraptor Kogan &amp;amp; Legner (Hymenoptera: Pteromalidae) é um dos principais parasitóides presentes nestes ambientes no Estado de São Paulo. O objetivo deste trabalho foi determinar a duração do ciclo biológico, as exigências térmicas e o parasitismo de M. uniraptor em pupas de Musca domestica L. (Diptera: Muscidae) em temperaturas constantes. Os testes foram realizados em câmaras climatizadas nas temperaturas de 18, 20, 22, 25, 28, 30 e 32 ± 1°C, 70 ± 10% U.R. e 14 h de fotofase. Em cada câmara 200 pupas de mosca doméstica, com 24 a 48 h de idade, foram expostas a 40 parasitóides fêmeas partenogenéticas, com 0 a 24 h...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: M. domestica; Insecta; Controle biológico; Parasitóide pupal; Temperatura.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000300005

Use of organic compost produced from slaughterhouse waste as fertilizer in soybean and corn crops
Provedor de dados: 63
Autores: Nunes,Walder Antonio Gomes de Albuquerque; Menezes,June Faria Scherrer; Benites,Vinícius de Melo; Lima Junior,Sérgio Araújo de; Oliveira,Anderson dos Santos.
Slaughterhouses generate large amounts of rumen content and its use as a fertilizer may offer an environmentally friendly strategy for its management. The effect of an organic fertilizer produced from slaughterhouse waste on the fertility of sandy and clayey soils as well as soybean yield (Glycine max L.) and corn (Zea mays L.) crops was evaluated. Field experiments were set up and five rates up to 16 t ha−1 of organic fertilizer (293 kg ha−1 N, 334 kg ha−1 P and 27 kg ha−1 K) were applied annually, before sowing in spring/summer, as well as a mineral fertilization of 300 kg ha−1 in the formulation 2-20-20 for soybean and 300 kg ha−1 of 12-15-15 for corn. The organic fertilizer changed soil fertility in the field experiments by increasing pH, Ca, Mg, K,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Organic fertilization; Nutrient recycling.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162015000400343

Caracterização e avaliação de populações de milho crioulo
Provedor de dados: 63
Autores: Araújo,Pedro Mário de; Nass,Luciano Lourenço.
A escolha do germoplasma é parte fundamental e decisiva para o sucesso de qualquer programa de melhoramento de plantas. Os objetivos deste trabalho foram caracterizar e avaliar o potencial genético de populações crioulas de milho (Zea mays L.) mantidas pelo IAPAR para fins de melhoramento. É apresentada uma caracterização de 25 populações crioulas de milho com relação ao tipo de endosperma e coloração dos grãos. Foram conduzidos ensaios em blocos ao acaso com duas repetições em três locais (Londrina-PR, Ponta Grossa-PR e Anhembi-SP). As populações crioulas mais promissoras para fins de melhoramento com ênfase na produção de grãos, na média dos três locais, foram GI156 (Cayano Sobrália) e GI045 (Tupy Pyta Sopé). A produtividade dessas populações...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Zea mays; Germoplasma; Raças locais.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000300027

Unraveling the signaling and signal transduction mechanisms controlling arbuscular mycorrhiza development
Provedor de dados: 63
Autores: Lambais,Marcio Rodrigues.
Arbuscular mycorrhiza (AM) are the most widespread symbiotic associations between plant roots and soil fungi. AM can contribute to increasing the survival and fitness of plants to limiting environments mostly due to their ability in improving nutrient uptake from the soil solution. Despite their ecological significance, the mechanisms controlling AM development and functioning are largely unknown. The obligate mutualistic nature of the arbuscular mycorrhizal fungi (AMF) has hampered the advances on the understanding and application of the symbiosis. Significant alterations in the genetic programs of both symbionts are required for the successful establishment of an AM, and complex signaling and signal transduction mechanisms are likely involved. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: DMI gene; Symbiosis; Branching factor; Receptor; Calcium spiking.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000400013

Genetic variability among sorghum accessions for seed starch and stalk total sugar content
Provedor de dados: 63
Autores: Gerrano,Abe Shegro; Labuschagne,Maryke Tine; van Biljon,Angeline; Shargie,Nemera Geleta.
Sorghum (Sorghum bicolor (L.) Moench) is a staple food grain in many semi-arid and tropical areas of the world, notably in sub-Saharan Africa because of its adaptation to harsh environments. Among important biochemical components for sorghum for processors are the levels of starch (amylose and amylopectin) and total sugar contents. The aim of this study was to determine the genetic variation for total starch in the seed, its components and total sugar in the stalks of the sorghum accessions from Ethiopia and South Africa. Samples of 22 sorghum accessions were evaluated. Significant variations were observed in total starch (31.01 to 64.88 %), amylose (14.05 to 18.91 %), the amylose/amylopectin ratio (0.31 to 0.73) and total stalk sugar content (9.36 to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amylopectin; Amylose; Biochemical; Protein.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162014000600005

Efeito de substrato artificial no enraizamento de estacas de calanchoe (Kalanchoe x blossfeldiana cv. singapur, crassulaceae)
Provedor de dados: 63
Autores: Gonçalves,A.L.; Minami,K.
Dez misturas artificiais foram estudadas para avaliar o efeito sobre o enraizamento de estacas apicais de Kalanchoe x blossfeldiana cv. Singapur, da família Crassulaceae. Essas misturas foram as seguintes: vermiculita + casca de arroz tostada nas proporções 1:1, 2:1 e 3:1; vermiculita + torta de filtro Oliver nas proporções 1:1, 2:1 e 3:1; vermiculita + turfa da região de Atibaia-SP, nas proporções 1:l, 2:le3:l; vermiculita + casca de pinheiro (mistura comercial). Os melhores resultados foram obtidos com a mistura vermiculita + torta de filtro Oliver em todas as proporções, vermiculita + casca de arroz tostada 3:1 e vermiculita + turfa 3:1. Os piores desempenhos foram os das misturas vermiculita + casca de pinheiro e vermiculita + turfa 1:1.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vermiculita; Casca de arroz; Torta de filtro; Enraizamento; Calanchoe; Kalanchoe x blossfeldiana.
Ano: 1994
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000200007

Efeito residual do adubo aplicado na soja (Glycine max L. Merrill) sobre a cana-de-açúcar (Saccharum spp.)
Provedor de dados: 63
Autores: Mascarenhas,H.A.A.; Costa,A.A.; Tanaka,R.T.; Ambrosano,E.J.; Rosa,F.V.; Costa,V.F.
Foi conduzido na Fazenda Nova Aliança no município de Sales de Oliveira, SP em latossolo roxo distrófico um experimento com 14 tratamentos para verificar o aproveitamento pela cana, do efeito residual do adubo aplicado na soja e vice-versa. O delineamento experimental foi de blocos ao acaso com quatro repetições. Os resultados mostraram que cana apenas aproveitou o efeito residual quando as doses de fertilizantes foram altas.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soja; Cana; Adubação; Efeito residual.
Ano: 1994
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000200011

Carbono e nitrogênio em solo de uma cronossequência de floresta tropical - pastagem de Paragominas
Provedor de dados: 63
Autores: Bernoux,Martial; Feigl,Brigitte Josefine; Cerri,Carlos Clemente; Geraldes,Ana Paula de Arauda; Fernandes,Silvana Aparecida Pavan.
Amostras de terra de áreas desmatadas há 4, 10 e 15 anos e utilizadas como pastagem e uma floresta nativa na região de Paragominas-PA, foram analisadas quanto à constituição isotópica e teor de carbono (C) e nitrogênio (N) com o objetivo de quantificar os estoques de C e N e as alterações devidas a mudanças do uso da terra. O conteúdo de C e N aumentaram ao longo do tempo de uso do solo como pastagem. Após 4 e 15 anos de cultivo o conteúdo de C aumentou 0,28 e 0,86 kg.m-2 na camada superficial 0-30 cm do solo; a pastagem de 10 anos ficou estável (diminuição de 0,02 kg.m-2) em relação à mata natural para a camada 0-30 cm, mas diminuiu de 0,15 na camada 0-10 cm. Na camada superficial 0-30 cm, a matéria orgânica da área sob mata natural é composta por 2,6...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Matéria orgânica pastagem floresta Amazônica &lt; FONT FACE=Symbol&gt; D&lt; /font&gt; 13C carbono nitrogênio.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000400003

Avaliação de genótipos de Leucaena spp. nas condições edafoclimáticas de São Carlos, SP: I. caracterização fenotípica e avaliação agronômica
Provedor de dados: 63
Autores: Primavesi,A.C.P. de A.; Nogueira,A.R.A.; Primavesi,O.; Godoy,R.; Batista,L.A.R.; Novaes,N.J.; França-Dantas,M.S.
Para avaliar genótipos promissores de Leucaena spp., foi instalado experimento em Latossolo Vermelho-Amarelo distrófico, na área da EMBRAPA-CPPSE em São Carlos, situada a 22°01'S e 47°53'W, com altitude de 856 m e média de precipitação anual de 1502 mm. Foram testados os seguintes genótipos: Leucaena leucocephala cv. Texas 1074 (T1), L.leucocephala 29 A9 (T2), L.leucocephala 11 x L.diversifolia 25 (T3), L.leucocephala 11 x L.leucocephala 26 (T4), L.leucocephala 24-19/2-39 X L.diversifolia 26 (T5) e L.leucocephala cv. Cunningham (testemunha). Através das avaliações efetuadas durante o período de estabelecimento (15 meses), verificou-se que: a) as plantas de L.leucocephala 24-19/2-39 x L.diversifolia 26 se mostraram mais ramificadas e com maior produção de...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Leucaena spp.; Avaliação de genótipos; Caracterização biológica.
Ano: 1994
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000100008

Diets for feed training peacock bass Cichla sp.
Provedor de dados: 63
Autores: Cyrino,José Eurico Possebon; Kubitza,Fernando.
The use of prized, carnivorous fish species such as the peacock bass Cichla sp. in either intensive farming or sport fishing demand specific knowledge on feed conditioning strategies for those species. One thousand and fifteen 0.5-g fingerlings were trained for 7 days to feed on ground fish flesh (GF). Seven hundred and seventy six (76%) fish (0.63 ± 0.03 g) feeding on GF were stocked into twelve 0.03-m³ net cages (63 fish/cage) and submitted to gradual feed ingredient transition (GFIT) weaning technique. Moist pellets with 90, 80, 70 or 60% GF (GF-90, GF-80, GF-70 or GF-60, respectively) were offered during the first 4 days of GFIT. No fish accepted GF-00 at the end of GFIT. Fish started on GF-90 or GF-80 fed well until GF dietary levels dropped below...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Culture methods; Carnivorous fish; Weaning diets; Pelleted diets.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000400001

Combining ability of inbred lines of maize and stability of their respective single-crosses
Provedor de dados: 63
Autores: Aguiar,Aurélio Mendes; Carlini-Garcia,Luciana Aparecida; Silva,Adelmo Resende da; Santos,Mateus Figueiredo; Garcia,Antonio Augusto Franco; Souza Jr.,Cláudio Lopes de.
The utilization of diallel crosses for identification of superior combinations is a common practice in maize (Zea mays L.) breeding programs. This methodology allows the estimation of the combining ability of genotypes being evaluated. In this work, five inbred lines were evaluated as to their general (GCA) and specific (SCA) combining abilities, by using a complete diallel scheme. The single-crosses produced between these inbred lines were evaluated in seven environments, along with two checks, by using a randomized complete block design. Traits analized were: grain yield, plant height, ear height, ear placement, and prolificacy. A diallel analysis was carried out, following an adaptation of Griffing's method IV, in addition to hybrid stability and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Diallel crosses; Genotype vs. environment interaction; Grain yield; Adaptability.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000100013

Quantitative evaluation of soil ion content using an imaginary part model of soil dielectric constant
Provedor de dados: 63
Autores: Hu,Wei; Zhang,Lei; Chen,Binglin; Zhou,Zhiguo.
ABSTRACT: An imaginary part model of soil dielectric constant for predicting the soil salinity status was developed based on a series of relations between dielectric imaginary part and soil bulk conductivity, soil bulk conductivity and soil solution electrical conductivity, and soil solution electrical conductivity and ion contents in soil using pot trials with different soil salinity levels in the 2008 growing season. This model was calibrated and tested with data from the 2009 growing season. The results showed that the inverted values of the total concentration of salt (Sc), Cl−, and Ca2+ at low frequencies (P-band of microwave observations) from the imaginary part model fitted well with the observed values, since root mean square errors (RMSEs) were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Microwave sensing; Prediction; Soil salinity.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162019001400299

Efeito na produtividade da rotação de culturas de verão e crotalária no inverno
Provedor de dados: 63
Autores: MASCARENHAS,H.A.A.; NOGUEIRA,S.S.S.; TANAKA,R.T.; MARTINS,A.L.M.; CARMELLO,Q.A.C.
Em ensaio de rotação de culturas, conduzido em Pindorama, SP, num solo podzólico vermelho amarelo, fase arenosa, durante os anos agrícolas de 1991/92, 1992/93 e 1993/94, avaliou-se o efeito da rotação entre milho, soja e arroz, com e sem crotalária júncea de inverno, na produção das culturas, no final do terceiro ano da experimentação. Não houve diferença entre tratamentos na produção da soja. A rotação aumentou a produção de arroz e milho, comparativamente ao monocultivo dessas culturas. A boa produtividade alcançada das culturas no terceiro ano pode ser atribuída, além da rotação, à ocorrência regular de chuvas e ao uso de cultivares tolerantes à acidez
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Rotação; Soja; Arroz; Milho; Crotalaria juncea.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000300024

Odor from anaerobic digestion of swine slurry: influence of pH, temperature and organic loading
Provedor de dados: 63
Autores: Ortiz,Gerardo; Villamar,Cristina Alejandra; Vidal,Gladys.
Farm slurry management from storage and/or treatment is the main source of odors from swine production, which are determined by factors such as operational variations (organic loading), cleaning of facilities and animal diet (pH) or environmental conditions (temperature). The aim of this study was to evaluate the influence of pH, temperature and organic loading on odor generation during anaerobic digestion of swine slurry. The methodology employed batch experimental units under controlled pH (6.0, 6.5, 7.0 and 8.0) and temperature (20, 35 and 55 °C) conditions. Additionally, an Upflow Anaerobic Sludge Blanket (UASB) system was operated under two Organic Loading Rate (OLR) conditions as Chemical Oxygen Demand (COD) (Phase I: 0.4 g L-1 d-1 of COD, Phase II:...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anaerobic treatment/storage; Odor threshold; Operational factors; Swine slurry.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162014000600001

Smectite in mangrove soils of the State of São Paulo, Brazil
Provedor de dados: 63
Autores: Souza-Júnior,Valdomiro Severino de; Vidal-Torrado,Pablo; Garcia-González,Maria Teresa; Macías,Felipe; Otero,Xosé Luis.
Smectitic clay minerals are frequently identified in mangrove soils, but there is little information about their types and origins. Besides their importance in the agronomical and geotechnical areas, smectites play an important environmental role by adsorbing nutrients, organic pollutants and heavy metals. Smectites found in mangrove soils can be of marine or continental detrital origin, or of neoformation origin. Thus, the objective of this study was to identify the types of smectites present in the State of São Paulo mangrove soils (Brazil), and to relate them to their possible origins. Soil samples were taken in five mangroves along the State of Sao Paulo State coast line. The mineral composition of the clay fraction was identified by X-ray...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Greene-Kelly test; Neoformation; Nontronite.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000100007

Identificarion of contaminant bacteria in cachaça yeast by 16s rDNA gene sequencing
Provedor de dados: 63
Autores: Carvalho-Netto,Osmar Vaz de; Rosa,Daniel Dias; Camargo,Luis Eduardo Aranha.
Cachaça is a typical Brazilian liquor produced from the distillation of fermented sugarcane juice mainly by Saccharomyces cerevisiae. Most of the domestic production is artisanal, and producers usually are not concerned regarding microbiological control of the fermentation. This study aimed to characterize the contaminant bacterial community of the yeast used in the production of cachaça in an artisanal still. Four samples were collected, of which one (NA) was used for comparison purposes and was collected one year earlier. The remaining samples were collected at three different periods: at the end of the first day of fermentation (NP), after fifteen days (NS), and thirty days after the same yeast was used (NT). Five hundred and eighty-seven sequences were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aguardente; Alcoholic fermentation; Genetic characterization; Pé-de-cuba.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000500010

A model to explain high values of pH in an alkali sodic soil
Provedor de dados: 63
Autores: Guerrero-Alves,José; Pla-Sentís,Ildefonso; Camacho,Rafael.
For alkali sodic soils (pH&gt;8.5), the "hydrolysis of exchangeable sodium" has been used as a possible explanation for the alkalinity production and rise in pH of these soils. As an alternative to this hypothesis, a model was developed to simulate and to explain that the alkalinity production and rise in pH is possible in a soil that accumulates alkaline sodium salts and CaCO3. Several simulations were performed by using different combinations of CO2 partial pressures (P), presence or absence of MgCO3, along with experimental values of exchangeable sodium percentage (ESP) and ion concentrations in saturation extracts from an alkali sodic soil (named Pantanal). A hypothetical system with similar conditions to the Pantanal soil but with a Gapon selectivity...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gapon selectivity coefficients; Calcium carbonate; Sodium bicarbonate; Alkaline hydrolysis.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000400021

Decline of phosphorus, copper, and zinc in anaerobic swine lagoon columns receiving pretreated influent
Provedor de dados: 63
Autores: Szögi,Ariel A.; Vanotti,Matias B.
ABSTRACT Land application of both anaerobic lagoon liquid and sludge can increase nutrient accumulation beyond the soil’s assimilative capacity and become a threat to water quality in regions with intensive, confined swine production. In a 15-month meso-scale column study, we evaluated the effect of manure pretreatment on the reduction of total suspended solids (TSS), total phosphorus (TP), soluble reactive P (SRP), and total copper (Cu) and zinc (Zn) in swine lagoons using (i) enhanced solid-liquid separation (SS) and (ii) solid-liquid separation plus biological nitrogen treatment with nitrification-denitrification (SS + NDN). A conventional anaerobic lagoon treatment was included as a control. A mass flow balance revealed that with both pretreatments the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pig; Manure; Nutrients; Solid-liquid separation.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000500417

Oviposition and predation of Pentilia egena mulsant (Coleoptera: Coccinellidae) in response to temperature
Provedor de dados: 63
Autores: Guerreiro,Julio César; Busoli,Antonio Carlos; Berti Filho,Evoneo.
The species Pentilia egena Mulsant is an important predator of armored scales that occur in citrus orchards in Brazil. To intensify this biological control, knowing bioecological aspects in necessary for the improvement of massal insect rearing. This research investigated the influence of temperature (19ºC, 24ºC and 29ºC) on the number of eggs laid by P. egena and the number of Aspidiotus nerii Bouché scales preyed by this coccinellid. The highest number of eggs laid and of scales preyed, 5.1 ± 0.59 and 11.3 ± 0.19, respectively, occurred at 29ºC. However, egg viability (52.86%) was reduced at this temperature, and was lower than those at 19ºC and 24ºC (78.10% and 74.07%, respectively). Temperature did not affect the ladybeetle oviposition behavior as the...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Diaspididae; Predator; Ladybeetle; Natural enemies.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000300026

Acclimatization of micropropagated Heliconia bihai (Heliconiaceae) plants
Provedor de dados: 63
Autores: Rodrigues,Paulo Hercílio Viegas; Lima,Ana Maria Liner Pereira; Ambrosano,Gláucia Maria B.; Dutra,Maria de Fátima Batista.
To evaluate the behavior of micropropagated heliconia seedlings during the acclimatization process using different substrates and shade levels, seedlings of H. bihai (Lobster Claw I) were planted in plastic trays using the substrates: washed sand, vermiculite (medium texture), and PlantMax® Horticultura, and shade cloths with percentages of 0% (full sun), 30%, 40%, 50%, 60%, 70%, and 80% of shade in relation to full sun. Best results were obtained for washed sand and PlantMax substrates at shade conditions starting from 50%, especially at 70% and 80%. Pre-existing roots from in vitro rootings were not functional, not presenting secondary roots, and showing root tissue necrosis. Acclimatized seedlings developed new roots. This finding suggests that this...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Heliconia; Ex vitro culture; Rooting.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000300016

Canopy management effects on ‘Syrah’ grapevines under tropical semi-arid conditions
Provedor de dados: 63
Autores: Leão,Patrícia Coelho de Souza; Nunes,Bruna Thaís Gonçalves; Lima,Maria Auxiliadora Coelho de.
ABSTRACT The aim of this study was to evaluate the effects of shoot topping and leaf removal practices on vegetative vigor, yield and physicochemical characteristics of the 'Syrah' grape in the semi-arid tropical climate conditions of the São Francisco River Valley in the northeast of Brazil. The experiment was conducted over five growing cycles from 2010 to 2012 in a 'Syrah' commercial vineyard in the municipality of Casa Nova, Bahia, Brazil. Treatments consisted of leaf removal once or twice during fruit set or at the beginning of bunch closure, and one or two shoot toppings of the berry when pea-sized or 10 days after berry growth had commenced. Leaf removal and shoot topping did not affect yield, plant vigor components nor the main attributes of fruit...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vitis vinifera L.; Tropical viticulture; Summer pruning; Shoot topping; Leaf removal.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000300209

Produção de álcoois superiores por linhagens de Saccharomyces durante a fermentação alcoólica
Provedor de dados: 63
Autores: Gutierrez,L.E.
A produção de álcoois superiores pelas leveduras Saccharomyces cerevisiae M-300-A, Saccharomyces uvarum IZ-1904 e levedura de panificação (Saccharomyces cerevisiae) foi estudada em diversas condições de temperatura, concentração de sacarose, pH, fontes de nitrogênio e com inibidor 2-4 dinitrofenol (DNP). Em todas as condições estudadas, a levedura Saccharomyces uvarum IZ-1904 apresentou a menor formação de álcoois superiores enquanto a levedura de panifícação apresentou os teores mais elevados. Com o aumento de temperatura e da concentração de sacarose ocorreu maior formação de álcool isoamílico pelas leveduras estudadas. Em pH 4,5 ocorreu menor produção de álcoois superiores do que em pH 3,0. Na presença do inibidor DNP ocorreu significativa redução...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Álcoois superiores; Saccharomyces; Fermentação alcoólica.
Ano: 1993
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161993000300021

Initial root length in wheat is highly correlated with acid soil tolerance in the field
Provedor de dados: 63
Autores: Pereira,Jorge Fernando.
ABSTRACT: In acid soils, toxic aluminum ions inhibit plant root growth. In order to discriminate aluminum (Al) tolerance, trustful screening techniques are required. In this study, 20 wheat cultivars, showing different levels of Al tolerance, were evaluated in a short-term soil experiment to access their relative root length (RRL). Moreover, the alleles of two important genes (TaALMT1 and TaMATE1B) for Al tolerance in wheat were discriminated. Both of these genes encode membrane transporters responsible for the efflux of organic acids by the root apices that are thought to confer tolerance by chelating Al. Genotypes showing TaALMT1 alleles V and VI and an insertion at the TaMATE1B promoter were among the ones showing greater RRL. Mechanisms of Al...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Triticum aestivum; Aluminum tolerance; Citrate and malate transporters; Short-term soil experiment.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162018000100079

Occurence and host specificity of indigenous rhizobia from soils of São Paulo State, Brazil
Provedor de dados: 63
Autores: Lombardi,Maria Luiza Colognesi de Oliveira; Moreira,Milene; Ambrósio,Luís Alberto; Cardoso,Elke Jurandy Bran Nogueira.
The occurrence of rhizobial communities at four sites under natural vegetation and one site under pasture were examined. Isolates of rhizobia originating from crotalaria (C. junceae), common bean (Phaseolus vulgaris) and pigeon pea (Cajanus cajan) were studied in relation to population density, host specificity and the interaction between rhizobial occurrence, climatic conditions and soil properties. pH values and potential acidity were the soil properties that most affected rhizobial occurrence. Rhizobia from crotalaria and common bean were evaluated at four sites, and from pigeon pea, at five sites. Common bean was the most specific legume, followed by peanuts, crotalaria and pigeon pea.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Rhizobium; Bradyrhizobium; Crotalaria; Pigeon pea; Common bean.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000400018

Reference evapotranspiration based on class A pan evaporation
Provedor de dados: 63
Autores: Conceição,Marco Antônio Fonseca.
Estimating reference evapotranspiration (ETo) based on Class A pan evaporation (ECA) is very usual in irrigated areas. For this purpose the ECA values are multiplied by a pan coefficient (Kp) to obtain ETo. Kp values can be estimated in different ways being, however, important to know which method would estimate the best value for a given locality. In the present work estimated values of ETo based on Class A pan evaporation, using Kp values determined by different methods, were compared to Penman-Monteith-FAO (EToPM) values for the northwest region of the São Paulo State, Brazil. The annual average Kp, determined dividing EToPM by ECA, was 0.74. For the rainy months (December to March) the average Kp value was 0.80 and for the dry months (April to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Penman-Monteith; Pan coefficient; Irrigation.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000300001

Avaliação de materiais orgânicos empregados como fertilizantes
Provedor de dados: 63
Autores: Rodella,A.A.; Alcarde,J.C.
Discutiram-se os critérios de avaliação de materiais orgânicos empregados como fertilizantes adotados na legislação brasileira atual. Trabalhando com amostras de compostos, estéreos, resíduos industriais e turfa, discutiu-se a determinação de carbono orgânico através de oxidação pelo íon dicromato. Sugeriu-se que o atual método de determinação de matéria orgânica total por combustão tenha sua utilização restrita ou desaconselhada, devido aos erros grosseiros que proporciona. Como forma de se avaliar a qualidade de materiais orgânicos, discutiu-se a determinação da capacidade de retenção de cátions (CTC) em fertilizantes e materiais orgânicos em geral. O grau de maturação ou estabilidade de compostos orgânicos pôde ser convenientemente expresso através da...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fertilizante orgânico; Carbono orgânico; Capacidade de troca de cátions; Turfa; Compostos.
Ano: 1994
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000300030

Field evaluation of water or citrate soluble phosphorus in modified phosphate rocks for soybean
Provedor de dados: 63
Autores: Prochnow,Luís Ignácio; Cunha,José Francisco da; Ventimiglia,Ariel Francisco Candiotti.
Ten P fertilizers were collected (commercial fertilizers) or synthesized (experimental sources) in order to obtain single superphosphates varying in water and citrate solubility. A standard source of P was also produced by crystallization of the water-soluble fraction of a triple superphosphate. Eleven P sources were band applied to a medium textured Xanthic Hapludox, in Bahia, Brazil (low content of resin-extractable P) at a rate of 80 kg ha-1 of NAC + H2O (neutral ammonium citrate plus water) soluble P2O5, with soybean as the crop which was grown to maturity. A check plot (control) was included in the study. Three of the P sources [single superphosphate produced from Araxa phosphate rock (PR), low-grade single superphosphate produced from Lagamar PR and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Acidulated phosphates; Available P; Phosphorus sources; Water-insoluble P.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000100025

Triple categorical regression for genomic selection: application to cassava breeding
Provedor de dados: 63
Autores: Lima,Leísa Pires; Azevedo,Camila Ferreira; Resende,Marcos Deon Vilela de; Silva,Fabyano Fonseca e; Viana,José Marcelo Soriano; Oliveira,Eder Jorge de.
ABSTRACT: Genome-wide selection (GWS) is currently a technique of great importance in plant breeding, since it improves efficiency of genetic evaluations by increasing genetic gains. The process is based on genomic estimated breeding values (GEBVs) obtained through phenotypic and dense marker genomic information. In this context, GEBVs of N individuals are calculated through appropriate models, which estimate the effect of each marker on phenotypes, allowing the early identification of genetically superior individuals. However, GWS leads to statistical challenges, due to high dimensionality and multicollinearity problems. These challenges require the use of statistical methods to approach the regularization of the estimation process. Therefore, we aimed to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: G-BLUP; BLASSO; Genomic prediction; Genomic heritability.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162019001500368

Agronomic evaluation of 'Bordô' grapevine (Ives) clones
Provedor de dados: 63
Autores: Miotto,Lidiane Carla Vilanova; Mota,Renata Vieira da; Souza,Claudia Rita de; França,Danilo Vieira Cardozo; Dias,Frederico Alcântara Novelli; Pimentel,Rodrigo Meirelles de Azevedo; Dal'Osto,Marite Carlin; Regina,Murillo de Albuquerque.
'Bordô' grapevines (Vitis labrusca) have great relevance to viticulture due to the quality they can impart to wines and juices. However, this cultivar has high variation in yield, ranging from 6 to 11 t ha-1. The use of clones with superior genetic potential related to scions currently marketed may increase crop profitability and revitalize its cultivation. The aim of this study was to evaluate the agronomical responses of twelve clones of the Bordô cultivar selected over a period of 15 years according to yield and quality. The vineyard was planted in 2008. Grape plants were grafted onto '1103 Paulsen' rootstock and trained on vertical shoot positioning. The agronomical evaluations, performed in the 2011, 2012 and 2013 seasons, covered the duration of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vitis labrusca; Productivity; Quality; Composition; Anthocyanins.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162014000600003

Cation exchange capacity of an oxisol amended with an effluent from domestic sewage treatment
Provedor de dados: 63
Autores: Fonseca,Adriel Ferreira da; Alleoni,Luís Reynaldo Ferracciú; Melfi,Adolpho José; Montes,Célia Regina.
The addition of Na-rich anthropogenic residues to tropical soils has stimulated the scientific community to study the role of sodium in both the soil solution and the exchange complex. In this study, several different methods were used to calculate the concentration of exchangeable and soluble cations and this data was then used to establish correlations between the level of these cations and both the accumulation of various elements and the dry weight of maize grown in a greenhouse under different conditions. In the closed environments of the pots, the most suitable method for calculating the effective cation exchange capacity (ECEC) was the cation exchange capacity calculated by cations removed with barium chloride solution (CEC S). Then again, the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Exchangeable cations; Soil solution; Soil with variable charge; Treated sewage effluent; Maize.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000600007

Nitrogen fertilization and soil management of winter common bean crop
Provedor de dados: 63
Autores: Silva,Matheus Gustavo da; Arf,Orivaldo; Sá,Marco Eustáquio de; Rodrigues,Ricardo Antônio Ferreira; Buzetti,Salatiér.
The adoption of appropriate cultural management, which includes nitrogen fertilization and soil tillage system, is very important to increase the efficiency of plant in the utilization of available resource. This research work was conducted for three years aiming at evaluating the effect of sidedressing nitrogen application (0, 25, 50, 75, and 100 kg ha-1) on winter bean crop under different systems of soil management (conventional, minimal, and no-tillage systems). The experimental design was a randomized block arranged in strips relative to tillage systems, with random distribution of nitrogen doses into each strip, with four replications. Grain yield was affected by nitrogen rates and significant increases were obtained with the application of 75 to 100...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phaseolus vulgaris L.; Moldboard plow; Disk harrow; Nitrogen rates; No-tillage.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000300012

Growth promotion of common bean and genetic diversity of bacteria from Amazon pastureland
Provedor de dados: 63
Autores: Ferreira,Linnajara de Vasconcelos Martins; Carvalho,Fernanda de; Andrade,Júlia Fonseca Colombo; Moreira,Fatima Maria de Souza.
ABSTRACT: A significant number of bacterial species, particularly in the rhizosphere, may benefit plant growth and development. This group of bacteria is known as plant growth-promoting rhizobacteria (PGPR). This study identified genetically isolates of common bean nodules used to trap bacteria from Amazon pastureland and investigated their capacity of nodulating and promoting growth of common bean when inoculated or co-inoculated with CIAT899 strain (Rhizobium tropici). Two experiments were carried out in a greenhouse, in axenic conditions, using the common bean cultivar Talismã. In the first experiment, 56 PGPR strains were evaluated individually regarding growth promotion and nodulation. In the second experiment, inoculation of seven PGPR strains...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phaseolus vulgaris; Co-inoculation; Endophytic bacteria; Rhizobia.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162018000600461

Interactions between diazotrophic bacteria and mycorrhizal fungus in maize genotypes
Provedor de dados: 63
Autores: Miyauchi,Marina Yumi Horta; Lima,Dáfila Santos; Nogueira,Marco Antonio; Lovato,Gisele Milani; Murate,Letícia Sayuri; Cruz,Márcio Ferreira; Ferreira,Josué Maldonado; Zangaro,Waldemar; Andrade,Galdino.
Some diazotrophic bacteria can fix nitrogen biologically in gramineous host plants. Generally, gramineous plants are also associated with mycorrhizal fungi, that can improve mainly plant P uptake. Among the factors affecting plant-microbe interactions, the plant genotype plays an important role. This study evaluates the effect of diazotrophic bacteria and an arbuscular mycorrhizal fungus (AMF), on five genotypes of maize (Zea mays L.), in relation to plant biomass, shoot N and P concentrations, and fine root morphological traits. The experimental design was entirely randomized in a factorial 5 × 4 × 2 arrangement, i.e., five maize genotypes (hybrids C333B, AS3466, and PREMIUM, and the inbreed lines lg40897-1 and lg40505-1), three diazotrophic bacteria...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Azospirillum; Biological nitrogen fixation; Mycorrhiza; Root morphology.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000500012

Cobertura do substrato com filme plástico e o cultivo hidropônico da roseira: produtividade, consumo de água, temperatura e salinização
Provedor de dados: 63
Autores: Rodrigues,Ernesto José Resende; Minami,Keigo; Farina,Enrico.
Roseiras das cultivares Anna e Sari foram conduzidas em cultivo hidropônico em bancadas com e sem cobertura do substrato. O material usado para a cobertura foi o polietileno (PEBD) de coloração preta e com espessura de 0,18 mm. Como substrato de cultivo, foi usada a mistura de areia:turfa = 4:1 v/v. Os transplantes foram feitos em novembro de 1995, dispostos em fila única com 7,5 plantas/m2. Para o controle da fertirrigação, foi usado o método que se baseia no uso de um lisímetro, colocado em cada bancada, o qual permite obter o percentual de drenado prefixado e também controlar o limite máximo de salinidade do percolado, a partir do qual é adicionada água para lavar o excesso de sais do substrato. O percentual teórico de drenagem foi fixado em 10% do...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Rosa; Cobertura do substrato; Cultivo hidropônico.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000400004

Edaphic fauna affects soybean productivity under no-till system
Provedor de dados: 63
Autores: Kraft,Elston; Oliveira Filho,Luís Carlos Iuñes de; Carneiro,Mayara Costa; Klauberg-Filho,Osmar; Baretta,Carolina Riviera Duarte Maluche; Baretta,Dilmar.
ABSTRACT: This study aimed to evaluate the relationship of edaphic fauna under a no-tillage system with different levels of soybean productivity [High (NTH), Medium (NTM) and Low (NTL)] in the west of Santa Catarina (Brazil), identifying which chemical and physical variables most affect them, and the best indicators that can be used. Native forest (NF) areas were used as a reference. A total of 207 samples of soil fauna were collected by soil monolith and pitfall trap methods over two years of evaluation in four municipalities. Based on edaphic fauna data, Shannon-Wiener (H’), Pielou (J), Dominance (D), Margalef and Fisher Alpha (α) indices were generated, in addition to the average richness and abundance. Data from NTs were submitted to analysis of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil quality; Soil biology; Agricultural sustainability; Conservation system.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000200701

Growth analysis of chickpea (Cicer arietinum L.)
Provedor de dados: 63
Autores: Nogueira,S.S.S.; Nagai,V.; Braga,N.R.; Novo,M. Do C.S.S.; Camargo,M.B.P.
An experiment to study the growing pattern of a chickpea variety, IAC-Marrocos, was carried out at the Monte Alegre Experimental Station, SP, during 1987 and 1988. The dry matter production of all parts of the plant, as well the leaf area index, were weekly evaluated. Exponential quadratic models of regression were adjusted to total dry matter, leaf dry matter and leaf area index, and a linear model to dry matter of grain. Based on the growth analysis it was concluded that the chickpea is a rustic eatable plant that can be recommended as an alternative winter crop for similar climatic conditions as those of the experiment.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chickpea; Growing indexes; Yield.
Ano: 1994
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000300008

Adubação de soqueira de cana-de-açúcarcom soluções de carbonato/bicarbonato de amônio em mistura com sais de potássio e de fósforo
Provedor de dados: 63
Autores: Oliveira,Fábio Alvares de; Bernardi,Alberto Carlos de Campos; Bittencourt,Valdomiro Corrêa de; Carmello,Quirino Augusto de Camargo.
Comparam-se as eficiências de soluções de aquamônia e de carbonato/bicarbonato de amônio contendo sais de K e de P quanto à produção de material seco da parte aérea e ao aproveitamento do N aplicado como fertilizante por cana-de-açúcar. Soqueiras de cana-de-açúcar da variedade "RB72454" foram transplantadas para vasos de 100 dm³ de terra e cultivadas por noventa dias. O delineamento experimental utilizado foi em esquema fatorial 2 x 3 inteiramente casualizado, com 4 repetições. Os tratamentos consistiram no fornecimento de fontes de N em combinações ou não com KCl e NH4H2PO4. Os nutrientes P e K não incluídos em cada tratamento foram aplicados em outro ponto, à mesma distância e profundidade das soqueiras que as soluções de tratamento, para assegurar a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Adubo não convencional; Fertilizante fluido; Nitrogênio.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000500003

Soil seed banks
Provedor de dados: 63
Autores: Christoffoleti,P.J.; Caetano,R.S.X.
The goal of this literature review is to discuss some of the major aspects of the soil seed bank, from its characteristics down to methodological aspects of its determination. Soil seed bank is the reservoir of viable seeds or of vegetative propagules that are present in the soil and that are able to recompose a natural vegetation. In the agroecossystems the soil seed bank is related to weeds, and the knowledge of its size and composition in terms of species can be used in the prediction of future infestations, to built simulation models of population establishment through time and also the definition of soil and cultural management programs, in order to have a rational use of herbicides.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Weed; Soil seed bank; Population dynamics.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000500013

Production of 34S-labeled gypsum (Ca34SO4.2H2O)
Provedor de dados: 63
Autores: Rossete,Alexssandra Luiza Rodrigues Molina; Bendassolli,José Albertino; Máximo,Everaldo; Sant Ana Filho,Carlos Roberto; Ignoto,Raquel de Fátima de.
Agricultural gypsum (CaSO4.2H2O) stands out as an effective source of calcium and sulfur, and to control aluminum saturation in the soil. Labeled as 34S it can elucidate important aspects of the sulfur cycle. Ca34SO4.2H2O was obtained by chemical reaction between Ca(OH)2 and H2(34)SO4, performed under slow agitation. The acid was produced by ion exchange chromatography using the Dowex 50WX8 cation exchange resin and a Na2(34)SO4 eluting solution. After precipitation, the precipitate was separated and dried in a ventilated oven at 60ºC. From 2.2 L H2SO4 0.2 mol L-1 and 33.6 g Ca(OH)2, 73.7 ± 0.6 g Ca34SO4.2H2O were produced on average in the tests, representing a mean yield of 94.6 ± 0.8%, with 98% purity. The 34SO2 gas was obtained from Ca34SO4.2H2O in the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sulfur 34; Stable isotope; Isotopic determination.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000400012

Resíduos de deltametrina em grãos de trigo e em seus produtos processados, determinados por cromatografia gasosa
Provedor de dados: 63
Autores: Trevizan,Luiz Roberto Pimentel; Baptista,Gilberto Casadei de.
O objetivo do presente estudo foi avaliar a degradação/persistência do inseticida piretróide deltametrina em grãos de trigo e em seus produtos processados, a saber: farelo, farinha branca, farinha integral e pão. Os grãos foram tratados de modo a alcançar a concentração teórica de 0,35 mg kg-1 do piretróide. As amostras foram tomadas a zero, 15, 30, 60 e 90 dias após a aplicação. Houve tendência de concentração do piretróide no farelo de trigo e um menor acúmulo nas farinhas, sendo que após o processo de cozimento do pão observou-se perda do inseticida.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Piretróide; Grão armazenado; Farelo; Farinha; Pão.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000200002

Duração do período de formação do grão em trigo
Provedor de dados: 63
Autores: Osório,E.A.; Wendt,W.
Admitindo a existência de correlação positiva entre o tempo de enchimento dos grãos e a produtividade, foi estudada a duração do período de formação dos grãos em cultivares brasileiras de trigo. Os resultados obtidos demonstram existir grande variação entre cultivares na duração deste período, o qual mostrou-se menor nas cultivares tardias de ciclo vegetativo longo. Destacaram-se, por possuírem longo período de formação dos grãos, as cultivares super-precoces SB 7519, CEP 7596 e IAS 58; as cultivares precoces Jacui, PF 75171, CNT 9, PEL 72393, Frontana, PAT 7392, IAS 54, Coxilha, Cotiporã e Nobre e as cultivares de ciclo intermediário CNT 8 e PEL 72390. Nenhuma cultivar tardia dentre as testadas evidenciou longo período do espigamento à colheita.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Trigo; Triticum aestivum; Formação do grão; Cultivar.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000200031

Monensina e digestibilidade aparente em ovinos alimentados com proporções de volumoso/concentrado
Provedor de dados: 63
Autores: Rodrigues,Paulo Henrique Mazza; Mattos,Wilson Roberto Soares; Melotti,Laércio; Rodrigues,Renato Ranzini.
A resposta obtida com a utilização dos ionóforos é influenciada por diversos fatores, entre eles a densidade energética da dieta. Foram objetivos do presente estudo avaliar os efeitos da monensina sobre a digestibilidade total em ovinos submetidos a diferentes dietas. Dezoito animais machos e castrados foram distribuídos em um delineamento inteiramente casualizado com um arranjo fatorial de tratamentos 2 x 3, correspondentes a zero ou 40 mg de monensina sódica por animal e por dia e 25%, 50% ou 75% de concentrados na dieta, composta por mistura de concentrados, a base de milho e farelo de soja, e feno de Coast-Cross. O experimento teve duração total de 25 dias, sendo os 5 últimos destinados à coleta de fezes e urina. A monensina aumentou a digestibilidade...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ionóforos; Fibra; Digestão; Ovinos.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000300002

Phosphite effect on hot and sweet pepper reaction to Phytophthora capsici
Provedor de dados: 63
Autores: Sala,Fernando Cesar; Costa,Cyro Paulino da; Echer,Márcia de Moraes; Martins,Marise Cagnin; Blat,Sally Ferreira.
Phosphite has been recommended to enhance plant resistance against Phytophthora. This work evaluated the response of hot and sweet pepper (Capsicum annuum L.) to Phytophthora capsici from juvenile up to the adult stage following treatment with phosphite. Sweet pepper hybrids considered to be resistant to P. capsici, like Reinger, Nathalie and Athenas, were evaluated. The susceptible checks were hybrid Magali R and cvs. Myr 10 and Ikeda. Hot pepper Criollo de Morelos 328, CM 334, BGH 3756, BGH 5122, CNPH 294 and Locorte were used as referential resistant lines. Phosphite did not have an effect on the hot pepper resistant lines because of their genetic homozygozity, while no protection was observed for the Athenas hybrid claimed to be resistant. Heterozygous...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Capsicum; Phosphorous acid; Resistance induction genetic; Pepper crown root rot.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000500005

Crescimento da parte aérea de cana crua e queimada
Provedor de dados: 63
Autores: Alvarez,Ivan André; Castro,Paulo Roberto de Camargo e.
Este trabalho teve como objetivos: 1. comparar o crescimento de cana colhida crua, mecanizada e de cana após a queima, colhida manualmente; 2. avaliar a influência do clima sobre as duas condições de crescimento e 3. analisar o comportamento do crescimento de cana crua e cana queimada nos 1º e 2º anos de rebrota, através de curvas adaptadas. A pesquisa foi realizada no município de Morro Agudo, SP, de julho de 1995 a julho de 1997. A variedade cultivada foi a SP 70 -1143. Utilizaram-se como indicadores de crescimento os seguintes índices biométricos: número de perfilhos, número de folhas, matéria seca de colmos e de folhas, IAF e avaliou-se a influência das temperaturas e das umidades do ar, do solo e das folhas. Adotou-se regressão polinomial e regressão...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cana-de-açúcar; Ecofisiologia; Queimada; Impacto ambiental.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000500008

Crescimento radicular e nutrição mineral da soja em função da calagem e adubação fosfatada
Provedor de dados: 63
Autores: ROSOLEM,C.A.; MARCELLO,C.S.
Tanto o cálcio como o fósforo tem importante ação no crescimento de raízes. No presente trabalho foi estudado, em vasos, o efeito de tres níveis de Ca e quatro níveis de P no crescimento radicular, produção de matéria seca e nutrição de plantas de soja cv. IAC 17. Duas plantas foram cultivadas em cada vaso de 7 L, preenchidos com terra proveniente de um Latossolo Vermelho Escuro de textura média, por 35 dias. Foi efetuada calagem calculada para se atingir saturações do solo por bases de 45, 50 e 75 %. As doses de P foram 25, 50, 100 e 200 mg kg-1, utilizando-se de fonte de P isenta de Ca. O teor de 8,5 mmol(c) dm-3 de Ca no solo foi suficiente para o crescimento normal do sistema radicular da soja. A baixa disponibilidade de P, em saturação do solo por...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycine max; Comprimento radicular; Raio radicular; Calcio; Fósforo; Nutrição mineral.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000300013

Ethylene evolution and endo-beta-mannanase activity during lettuce seed germination at high temperature
Provedor de dados: 63
Autores: Nascimento,Warley Marcos; Cantliffe,Daniel James; Huber,Donald John.
High temperatures during lettuce seed imbibition can delay or completely inhibit germination and the endosperm layer appears to restrict the radicle protrusion. The role of endo-beta-mannanase during lettuce seed germination at 35°C and the influence of ethylene in endo-beta-mannanase regulation were investigated. Seeds of 'Dark Green Boston' (DGB) and 'Everglades' (EVE) were germinated in water, or 10 mmol L-1 of 1-aminocyclopropane-1-carboxylic acid (ACC), or 10 mmol L-1 of aminoethoxyvinylglycine (AVG), or 20 mmol L-1 of silver thiosulphate (STS). Seeds were also primed in polyethylene glycol (PEG), or PEG + ACC, PEG + AVG, or PEG + STS. Untreated seeds germinated 100% at 20°C. At 35°C, EVE seeds germinated 100%, whereas DGB seeds germinated only 33%....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lactuca sativa; Thermoinhibition; Thermodormancy; Endosperm weakening; Seed priming.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000200006

Carbon sequestration in clay and silt fractions of Brazilian soils under conventional and no-tillage systems
Provedor de dados: 63
Autores: Reis,Cecília Estima Sacramento dos; Dick,Deborah Pinheiro; Caldas,Jennifer da Silva; Bayer,Cimélio.
The capacity of soils to sequestrate carbon (C) is mainly related to the formation of organo-mineral complexes. In this study, we investigated the influence of soil management systems on the C retention capacity of soil with an emphasis on the silt and clay fractions of two subtropical soils with different mineralogy and climate. Samples from a Humic Hapludox and a Rhodic Hapludox, clayey soils cultivated for approximately 30 years under no-tillage (NT) and conventional tillage (CT) were collected from six layers distributed within 100-cm soil depth from each site and from an adjacent native forest. After the removal of particulate organic matter (POM), the suspension (&lt;53 µm) was sonicated, the silt and clay fractions were separated in accordance with...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Carbon saturation; Mineralogy; Physical fractionation; Soil organic matter; Soil profile.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162014000400006

Sustained swimming improves fish dietary nutrient assimilation efficiency and body composition of juvenile Brycon amazonicus
Provedor de dados: 63
Autores: Arbeláez-Rojas,Gustavo Alberto; Moraes,Gilberto.
ABSTRACT Sustained swimming (SS) usually promotes beneficial effects in growth and feed conversion of fishes. Although feed efficiency is improves at moderate water velocity, more information is required to determine the contributions of this factor on growth and body composition. Body composition and efficiency responses to the use of nutrients were determined in juvenile matrinxa Brycon amazonicus (Spix and Agassiz, 1829) fed with two dietary amounts of protein, 28 or 38% of crude protein (CP), and subjected to sustained swimming at a constant speed of 1.5 body lengths s−1 (BL s−1) or let to free swimming. The fish body composition under SS and fed with 28% of dietary protein showed 22% of increased in bulk protein and a 26% of decrease in water content...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Benefits of exercise; Dietary protein; Nutrient retention; Optimal swimming speeds; Raceways.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162017000400259

Methane production of two roughage and total mixed ration as influenced by cellulase and xylanase enzyme addition
Provedor de dados: 63
Autores: Gemeda,Belete Shenkute; Hassen,Abubeker.
In recent decades supplementation of animal feeds with exogenous fibrolytic enzymes has substantially improved digestibility and animal performance. However, information related to associated methane production is limited and inconsistent. This study evaluated the effect of cellulase and xylanase enzymes on in vitro methane production of Eragrostis curvula hay, maize (Zea mays) stover and a total mixed ration (TMR) at seven levels of the two enzymes. Feed samples were incubated for 2, 12, 24 and 48 h in an in vitro batch culture with buffer and rumen fluid, and fibrolytic enzymes. Gas production was measured using a pressure transducer connected to a data tracker, while methane gas was analysed using a gas chromatograph which was calibrated with standard...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Digestibility; Fermentation; Fibrolyitc enzymes; Gas production.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162015000100011

Combining ability of maize inbred lines evaluated in three environments in Brazil
Provedor de dados: 63
Autores: Nass,Luciano Lourenço; Lima,Marlene; Vencovsky,Roland; Gallo,Paulo Boller.
For tropical areas like Brazil, genotype x environment interaction is an important source of variation. Our objectives were to examine the combining abilities and their interaction with environments in ten selected maize (Zea mays L.) inbred lines in diallel crosses and to identify candidates for promising hybrid combinations. Crosses and checks were evaluated through a 7 x 7 triple lattice design at three locations during the 1984/85 season. Several agronomic traits were evaluated, but here only data on ear yield are discussed. Yield data were adjusted for stand variation (correction to 50 plants per plot) and grain moisture (15.5%). Data for ear yield were analysed using an adaptation of Griffing’s method IV for complete diallel crosses, and experiments...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Diallel analysis; Combining ability; Genotype x environment interaction.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000100021

Toona ciliata genotype selection with the use of individual BLUP with repeated measures
Provedor de dados: 63
Autores: Ferreira,Rulfe Tavares; Viana,Alexandre Pio; Barroso,Déborah Guerra; Resende,Marcos Deon Vilela de; Amaral Júnior,Antônio Teixeira do.
The increasing demand for raw material for multiple uses of forest products and by-products has attracted the interest for fast growing species, such as the Australian Cedar (Toona ciliata), which presents high productive and economic potential. This study aimed at estimating genotypic parameters and values for the species through the use of the BLUP procedure, at individual level, with repeated measures, by means of the conventional evaluation procedures and the introduction of innovative digitalization of the measurements by digital camera with the images provided by the Imagej software system. The main objective is to subsidize the beginning of a breeding program for the species. The assays were carried out in private properties, in plantations located...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Australian Cedar; Mixed models.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162012000300006

Desempenho fisiológico e sanidade de sementes de trigo submetidas a tratamentos de hidratação/desidratação
Provedor de dados: 63
Autores: Motta,Carlos Augusto Pereira; Silva,Walter Rodrigues da.
Com o objetivo de avaliar os efeitos de tratamentos de hidratação/desidratação no desempenho fisiológico e na sanidade de sementes de trigo (Triticum aestivum L.), amostras dos cultivares "OCEPAR 7 - Batuíra" e "CEP 14 - Tapes", foram submetidas a períodos variáveis de 0 a 48 horas de hidratação, com intervalos de três horas entre si. Ao término de cada período de hidratação, as amostras foram caracterizadas quanto ao teor de água e aos estádios de desenvolvimento e, em seguida, submetidas à secagem até atingirem a umidade original. Após dois meses de armazenamento em câmara fria, as sementes foram avaliadas através de testes fisiológicos e de sanidade. Conclui-se que: períodos de hidratação superiores a 30 horas (a 20°C), seguidos de secagem, trazem...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Triticum aestivum; Trigo; Sementes; Tratamento; Hidratação e desidratação; Estádios de desenvolvimento; Germinação; Vigor; Sanidade.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000300009

Tricomas foliares em tomateiro com teores contrastantes do aleloquímico 2-tridecanona
Provedor de dados: 63
Autores: Aragão,Carlos Alberto; Dantas,Bárbara França; Benites,Flávio Rodrigo Gandolfi.
Duas espécies de tomateiro, Lycopersicon esculentum Mill. (Linhagem TOM 556- padrão com baixo teor da metil cetona 2-tridecanona (2-TD) e Lycopersicon hirsutum Dunal var. glabratum Mill. (Linhagem PI 134417- padrão com elevado teor de 2-TD), foram analisadas em conjunto para identificação e quantificação de tricomas foliares. A parte experimental constou da identificação dos tricomas, baseado na presença ou ausência da cabeça secretora na extremidade apical dos tricomas, arranjo e número de células da cabeça, comprimento dos tricomas, e da quantificação do número de tricomas glandulares e não glandulares nos folíolos. O delineamento utilizado para o número de tricomas foi inteiramente casualizado e as médias comparadas pelo teste de Tukey, a 5%. A...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Lycopersicon esculentum; Tomate; Tricomas; Aleloquímico; 2-tridecanona.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000400035

Digital soil mapping using reference area and artificial neural networks
Provedor de dados: 63
Autores: Arruda,Gustavo Pais de; Demattê,José A. M.; Chagas,César da Silva; Fiorio,Peterson Ricardo; Souza,Arnaldo Barros e; Fongaro,Caio Troula.
ABSTRACT Digital soil mapping is an alternative for the recognition of soil classes in areas where pedological surveys are not available. The main aim of this study was to obtain a digital soil map using artificial neural networks (ANN) and environmental variables that express soil-landscape relationships. This study was carried out in an area of 11,072 ha located in the Barra Bonita municipality, state of São Paulo, Brazil. A soil survey was obtained from a reference area of approximately 500 ha located in the center of the area studied. With the mapping units identified together with the environmental variables elevation, slope, slope plan, slope profile, convergence index, geology and geomorphic surfaces, a supervised classification by ANN was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Map extrapolation; Pedological survey; Landscape attributes; Pedological classes; Data mining.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000300266

Days on feed and sex effects on live weight and carcass traits measured by ultrasound
Provedor de dados: 63
Autores: Silva,Saulo da Luz e; Titto,Evaldo Antonio Lencioni; Leme,Paulo Roberto; Martello,Luciane Silva; Pereira,Angélica Simone Cravo; Titto,Rafael Martins; Nogueira Filho,José Carlos Machado; Luchiari Filho,Albino.
There is a paucity of information in the literature on body composition changes in Nellore cattle and its crosses, mainly on heifers and intact males. Ultrasound is a useful, low cost tool to easily obtain this information, with minimal animal stress. Effects of sex and days on feed on live weight (LW) and ultrasound Longissimus muscle area (ULMA) and subcutaneous fat thickness (UFAT) measurements were evaluated in F1 Piedmont &lt;FONT FACE=Symbol&gt;´&lt;/FONT&gt; Nelore, 27 heifers (HF) and 27 intact males (IM). HF and IM had an initial LW of 256 ± 5.6 and 265 ± 5.6 kg, respectively, and were fed a diet containing 77% TDN for 131 days. LW, ULMA, and UFAT were evaluated at 28-d intervals. Interactions between sex and days on feed were found for all traits...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Backfat thickness; Beef; In vivo evaluation; Ribeye area.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000500002

Mineralogical, chemical and electrochemical attributes of soils
Provedor de dados: 63
Autores: Almeida,Cecília Calhau; Fontes,Maurício Paulo Ferreira; Dias,Adriana Cristina; Pereira,Thiago Torres Costa; Ker,João Carlos.
ABSTRACT: A set of attributes endows the soils with distinctive characteristics and astute understanding is required in order to formulate suitable strategies for soil management. The aim of this study was to physically, chemically and mineralogically characterize samples of the main soil classes in Minas Gerais, Brazil, determine the point of zero salt effect (PZSE) and the point of zero charge (PZC), and ascertain the correlation between these factors and soil attributes. The soils evaluated presented different textural classes ranging from loamy sand (Entisol) to very clayey (some Oxisols and Ultisols). The soils differed substantially in terms of fertility, presenting a range from dystrophic (low fertility, base saturation &lt; 50 %) to eutrophic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil attributes; Weathered soils; Secondary minerals; Mineralogical composition; Point of zero charge.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000601402

PATOGENICIDADE DE BEAUVERIA BASSIANA (BALS.) VUILL. AO ÁCARO Tetranychus urticae KOCH
Provedor de dados: 63
Autores: Tamai,Marco Antonio; Alves,Sérgio Batista; Neves,Pedro Janeiro.
O estudo da patogenicidade de Beauveria bassiana (Bals.) Vuill. ao ácaro Tetranychus urticae Koch foi desenvolvido a 25 ± 2°C, 70 ± 5% UR e 12 horas de fotofase, utilizando-se fêmeas recém-emergidas. Os ácaros foram mantidos durante seis dias em discos de folha de Canavalia ensiformis (L.) DC. inoculadas com B. bassiana, isolado 447, nas concentrações: 5x106, 1x107, 5x107, 1x108, 5x108 e 1x109 conídios/ml. Este isolado mostrou-se patogênico a T. urticae, apresentando aumento nos valores das mortalidades acumuladas (total, corrigida e confirmada) à medida que a suspensão de conídios se tornou mais concentrada. Nas seis concentrações testadas, os valores de mortalidade corrigida ao sexto dia, foram inferiores a 50%, sendo observada apenas na concentração de...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Tetranychus urticae; Beauveria bassiana; Controle biológico.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000200004

Folhas verdes, folhas secas, fibra do colmo e a clarificação do caldo de cana-de-açúcar
Provedor de dados: 63
Autores: Bovi,Roberto; Serra,Gil Eduardo.
A presença de impurezas vegetais, como folhas verdes e secas, nos carregamentos de cana-de-açúcar entregues nas usinas de açúcar, tem preocupado os técnicos não somente por se tratar de um material sem qualquer valor tecnológico para processamento, como ainda por poder causar aumento na cor do caldo clarificado e conseqüentemente na cor do açúcar produzido, com redução de sua qualidade para o mercado; outro problema é o volume do lodo decantado nos clarificadores, cujo aumento causa maior recirculação e maior volume do caldo filtrado, com maiores perdas de sacarose e maior utilização dos filtros rotativos a vácuo. O trabalho teve como objetivo avaliar a clarificação do caldo de cana-de-açúcar com a adição de folhas verdes e folhas secas, tendo como...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cana-de-açúcar; Impureza; Folha; Clarificação.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000300003

Sulfur utilization by rice and Crotalaria juncea from sulfate - 34S applied to the soil
Provedor de dados: 63
Autores: Trivelin,Paulo Cesar Ocheuze; Bendassolli,José Albertino; Muraoka,Takashi; Carneiro Jr.,Francisco.
In tropical soils with intensive agriculture an increasing sulfur deficiency has been verified in several crops. The low available S in these soils is caused by the continuous use of concentrated NPK fertilizers. The objective of this work was to evaluate the utilization by rice (Oriza sativa L.) and crotalaria juncea (Crotalaria juncea L.) of sulfur applied to the soil, under greenhouse conditions. Pots with 3 kg of an Argisol (Paleudalf) were used to test the isotopic technique with the stable isotope 34S, adding a solution of sodium sulfate labeled with 34S (14.30 ± 0.05 atom % of 34S) to the soil (70 mg SO4-S per kg-1 of soil) 18 days after sowing both species. The shoots of the crotalaria and rice were harvested, respectively on the 72nd and 122nd...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Stable isotope; 34S technique; Mass spectrometry; Sulfur uptake.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000100030

Landscape and soil regionalization in southern Brazilian Amazon and contiguous areas: methodology and relevance for ecological studies
Provedor de dados: 63
Autores: Volkoff,Boris; Mello,Francisco Fujita de Castro; Maia,Stoécio Malta Ferreira; Cerri,Carlos Eduardo Pellegrino.
Soils of a large tropical area with differentiated landscapes cannot be treated uniformly for ecological applications. We intend to develop a framework based on physiography that can be used in regional applications. The study region occupies more than 1.1 million km² and is located at the junction of the savanna region of Central Brazil and the Amazon forest. It includes a portion of the high sedimentary Central Brazil plateau and large areas of mostly peneplained crystalline shield on the border of the wide inner-Amazon low sedimentary plain. A first broad subdivision was made into landscape regions followed by a more detailed subdivision into soil regions. Mapping information was extracted from soil survey maps at scales of 1:250000-1:500000. Soil units...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brazil; Rondônia; Mato Grosso; Regional soil diversity.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162012000300007

Academic writing, and how to write in a clear and comprehensible way
Provedor de dados: 63
Autores: Kozak,Marcin.
ABSTRACT An intrinsic part of our lives as scientists, academic writing strongly affects our careers. Even great researchers are much more likely to be successful if they are also proficient writers. Unfortunately, many researchers prefer long hours spent in the field or laboratory to writing. Often, this is a result of their reluctance towards writing, something that characterizes not only scientists, but many people in general. But many researchers do not like writing because they do not know how to do it well—academic writing is not that simple. In this paper, I show how to improve your academic writing skills. I do not teach writing; instead, I share my experience about learning how to write.
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Journals; Editing; Agricultural writing.
Ano: 2022
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162022000101701

Soil profile, relief features and their relation to structure and distribution of Brazilian Atlantic rain forest trees
Provedor de dados: 63
Autores: Guilherme,Frederico Augusto Guimarães; Ferreira,Tiago Osório; Assis,Marco Antonio; Torrado,Pablo Vidal; Morellato,Leonor Patrícia Cerdeira.
In tropical forests, the environmental heterogeneity can provide niche partitioning at local scales and determine the diversity and plant species distribution. Thus, this study aimed to investigate the variations of tree species structure and distribution in response to relief and soil profile features in a portion of the largest remnant of Brazilian Atlantic rain forest. All trees ³ 5 cm diameter at breast height were recorded in two 0.99 ha plots. Topographic survey and a soil characterization were accomplished in both plots. Topsoil samples (0-20 cm) were taken from 88 quadrats and analyzed for chemical and particle size properties. Differences for both diversity and tree density were identified among three kinds of soils. A canonical correspondence...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Tropical rain forest; Catena; Tree diversity; Niche partitioning; Tropical soils.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162012000100009

Bioregulator application, agronomic efficiency, and quality of soybean seeds
Provedor de dados: 63
Autores: Ávila,Marizangela Rizzatti; Braccini,Alessandro de Lucca e; Scapim,Carlos Alberto; Albrecht,Leandro Paiola; Tonin,Telmo Antônio; Stülp,Marcibela.
The application of vegetal bioregulators has shown promising results, mainly in cultures that have already reached a high level of technology. Based on this context an experiment was carried out with the objective of evaluating agronomic traits of plants, such as yield and quality of seeds, produced by applying bioregulators to a soybean crop. For this purpose, the following treatments were carried out: before sowing - seed treatment (25, 50 and 75 mL for 100 kg-1 seeds); during sowing time - spraying on the sowing lines (pulverization onto the sowing lines) (50, 100 and 150 mL ha-1); between stages V5 and V6 (25, 50 and 75 mL ha-1); and the control - no treatment. Emergence speed, final seedling emergence, number of pods and seeds per plant, average...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Growth regulator; Yield; Vigor; Germination.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000600006

Seed performance after exposure to high temperatures
Provedor de dados: 63
Autores: Silva,W. R.
In orthodox seed management, the application of temperatures over 42ºC is routinely associated with deterioration while biological behaviors in operations conducted under high temperatures are hardly ever studied. The results found, however, indicate the possibility of stationary drying of soybean seeds at 50ºC, provided that the insufflated air flow intensity is considered, as well as the reduction of B. brizantha seed dormancy submitted to 85ºC.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soybean; B. brizantha; Seeds; Use of heat.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000500019

Reduced sensitivity to azoxystrobin is stable in Monilinia fructicola isolates
Provedor de dados: 63
Autores: Primiano,Isabela Vescove; Molina,Juan Pablo Edwards; Mio,Louise Larissa May De; Peres,Natalia Aparecida; Amorim,Lilian.
ABSTRACT A shift towards declining azoxystrobin sensitivity has been previously documented in a collection of Brazilian Monilinia fructicola isolates, but information on the stability of this trait after in vitro sub-culturing is not available. In this study, one highly-sensitive isolate and two isolates with reduced sensitivity to azoxystrobin, not exhibiting point mutations at codons 129, 137 and 143 in the target gene of cytochrome b were used. Two independent experiments consisted of 10 weekly transfers of each strain in potato dextrose agar (PDA). Conidial production and germination were quantified in the initial culture and, again, after the third, sixth and tenth transfer. Measures of mycelial growth were obtained in colonies growing on PDA amended...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Prunus; Quinone-outside inhibitor.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162017000200169

Vegetable species for phytoextraction of boron, copper, lead, manganese and zinc from contaminated soil
Provedor de dados: 63
Autores: Santos,Gláucia Cecília Gabrielli dos; Rodella,Arnaldo Antonio; Abreu,Cleide Aparecida de; Coscione,Aline Renée.
Phytoremediation is an attractive option to remove metal from contaminated soil since it is a simple, low-cost, and environmentally friendly procedure. To better examine the phytoremediation potential of kenaf (Hybiscus canabinnus), mustard (Brassica juncea), turnip (Raphunus sativus) and amaranth (Amaranthus crentus) plants, a greenhouse experiment was performed in which these species were grown on a soil contaminated with Zn, Cu, Mn, Pb and B. The translocation, the bioconcentration and the removal index, the transference factor and the time to reach 50% of element removal from soil, among other indicators, were used in order to identify a hyperaccumulator. Kenaf plants were more tolerant to the conditions tested, with the highest dry matter production...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phytorremediation; Tropical soil; Heavy metal.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000600014

Tillering of Tifton 85 bermudagrass in response to nitrogen rates and time of application after cutting
Provedor de dados: 63
Autores: Premazzi,Linda Monica; Monteiro,Francisco Antonio; Corrente,José Eduardo.
Nitrogen fertilization is determinant for pasture productivity, as it results in increasing forage yield and is associated with the growth physiology of forage plants. An experiment was carried out in a greenhouse to evaluate the effects of nitrogen rates and times of application after cutting on Tifton 85 Bermuda grass (Cynodon spp.) tillering. Plants were grown in a Typic Quartzipsamment soil and nitrogen rates were 0, 80, 160 and 240 mg kg-1 of soil; times of application were immediately after and seven days after cutting. A 4 x 2 factorial experiment was set in a completely randomized block design (n= 4). Plants were evaluated in two sequential growth periods - 39 and 41 days. Nitrogen rates affected tiller density, considering the initial number of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cynodon; Tiller weight; Tiller density; Grass; Fertilization.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000300023

Characterization of type and genetic diversity among soybean cyst nematode differentiators
Provedor de dados: 63
Autores: Matsuo,Éder; Sediyama,Tuneo; Oliveira,Rosângela D'Arc de Lima; Cruz,Cosme Damião; Oliveira,Rita de Cássia Teixeira.
The development of soybean cyst nematode, Heterodera glycines Ichinohe, resistant genotypes with high yields has been one of the objectives of soybean (Glycine max (L.) Merrill) breeding programs. The objective of this study was to characterize the pathotype of soybean cyst nematodes and analyze the genetic diversity of ten differentiator lines ('Lee 74', Peking, Pickett, PI 88788, PI 90763, PI 437654, PI 209332, PI 89772, PI 548316 and 'Hartwig'). Inoculum was obtained from plants cultivated in field soil in Viçosa, state of Minas Gerais, Brazil. Thirty-four days after inoculating each plant with 4,000 eggs, the number of females, female index, total number of eggs, number of eggs per female, reproduction factor, plant height, number of nodes, fresh and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycine max; Heterodera glycines; Soybean breeding; Resistant cultivars.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162012000200010

Critical points on growth curves in autoregressive and mixed models
Provedor de dados: 63
Autores: Pinho,Sheila Zambello de; Carvalho,Lídia Raquel de; Mischan,Martha Maria; Passos,José Raimundo de Souza.
Adjusting autoregressive and mixed models to growth data fits discontinuous functions, which makes it difficult to determine critical points. In this study we propose a new approach to determine the critical stability point of cattle growth using a first-order autoregressive model and a mixed model with random asymptote, using the deterministic portion of the models. Three functions were compared: logistic, Gompertz, and Richards. The Richards autoregressive model yielded the best fit, but the critical growth values were adjusted very early, and for this purpose the Gompertz model was more appropriate.
Tipo: Info:eu-repo/semantics/article
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162014000100004

Crop coefficients of tropical forage crops, single cropped and overseeded with black oat and ryegrass
Provedor de dados: 63
Autores: Sanches,Arthur Carniato; Souza,Débora Pantojo de; Jesus,Fernanda Lamede Ferreira de; Mendonça,Fernando Campos; Gomes,Eder Pereira.
ABSTRACT: Crop coefficient (Kc) is the ratio between crop evapotranspiration (ETc) and reference evapotranspiration (ETo), representing the phenological effects on crop water consumption. Kc is fundamental to estimating ETc by agrometeorological methods. This research study aimed to determine Kc and ETc values for Guinea grass (Megathyrsus maximus cv. Mombaça) and Bermuda grass (Cynodon spp.), both single cropped for one year and overseeded with black oat (Avena strigosa) and ryegrass (Lolium multiflorum) during fall/winter. The experiment in the field comprised four plots, two for each tropical forage, with and without overseeding. At the center of each plot, there was a weighing lysimeter with an automated system for data collection. ETc was measured...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Avena strigosa; Lolium multiflorum; Evapotranspiration; Lysimetry; Tropical pastures.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162019001600448

Seasonal dynamics of vegetation indices as a criterion for grouping grassland typologies
Provedor de dados: 63
Autores: Moreira,Andreise; Bremm,Carolina; Fontana,Denise Cybis; Kuplich,Tatiana Mora.
ABSTRACT: This study aimed to characterize the average seasonal pattern of the vegetation in southern grassland in Brazil, and the variability found in the time series of vegetation indices. It also sought to identify similarities in the seasonal pattern of different grassland typologies. Moderate Resolution Imaging Spectroradiometer (MODIS), Normalized Difference Vegetation Index (NDVI) and Enhanced Vegetation Index (EVI) images from Feb to Dec, 2000 to 2014 were analyzed for ten regions. The grassland typologies studied showed EVI and NDVI profiles consistent with the seasonal dynamics of grassland vegetation under the influence of a subtropical climate, with highest values in the indices during the warm seasons of the year (spring and summer) and lowest...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: MODIS; EVI; NDVI; Phenology; Grassland vegetation.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162019000100024

Seeding density in wheat: the more, the merrier?
Provedor de dados: 63
Autores: Valério,Igor Pirez; Carvalho,Fernando Irajá Félix de; Benin,Giovani; Silveira,Gustavo da; Silva,José Antonio Gonzalez da; Nornberg,Rafael; Hagemann,Thais; Luche,Henrique de Souza; Oliveira,Antônio Costa de.
Adjustment of seeding schemes is one of the crop management techniques that most influences grain yield components. This work aimed to characterize the potential grain yield and its components in wheat (Triticum aestivum L.) genotypes with contrasting tillering ability under different seeding densities and environments. Five experiments were conducted in split-plot design, each with ten cultivars (main plot), sown in five distinct seeding densities (subplots). Experiments were sown in three locations in southern Brazil in the years 2005, 2006 and 2007. The grain yield per plot and its yield components: number of fertile tillers, weight of 1,000 grains, ear weight and number of grains per ear were evaluated. Genotypes with reduced tillering ability...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Triticum aestivum L.; G × E interaction; Tiller number; Yield components.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162013000300006

Cloning of putative ureG genes from Glomus intraradices and urease activities in tobacco arbuscular mycorrhizal roots
Provedor de dados: 63
Autores: Takahashi,Daniele; Ditt,Renata Fava; Lambais,Marcio R.
Even though the major benefit of arbuscular mycorrhizae is the increased uptake of phosphate from the soil solution and translocation to the plant, changes in the activity of enzymes involved in nitrogen (N) metabolism have been detected in mycorrhizal roots. Using differential display of reverse-transcripts of tobacco roots not-inoculated or inoculated with Glomus intraradices (Gi), we have cloned two partial cDNAs (NtGi2 and NtGi3). The presence of a conserved CobW/HypB/UreG domain and phylogenetic analyses suggest that NtGi2 and NtGi3 encode isoforms of urease accessory protein G (ureG) highly similar to ureG from fungi. The steady state levels of the putative ureG transcripts were shown to be higher in roots colonized by Gi, as compared to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nicotiana tabacum; DDRT-PCR; Arbuscular mycorrhiza; Urea; Ammonium sulfate; Nitrogen.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000200016

Enraizamento de estacas caulinares de kiwi (Actinidia chinensis Planch cv Abbott) tratadas com auxinas e boro
Provedor de dados: 63
Autores: Ono,E.G.; Rodrigues,J.D.; Pinho,S.Z. de.
O trabalho teve como finalidade, estudar o efeito de várias auxinas sintéticas em formulações comerciais e do boro, sobre o enraizamento de estacas caulinares de kiwi (Actinidia chinensis Planch, cv Abbott.). As estacas utilizadas continham dois nós e duas folhas cortadas ao meio, com aproximadamente 10 cm de comprimento, onde o corte basal em bisel foi realizado logo abaixo de um nó e o apical acima do outro nó. O efeito das auxinas, sobre o enraizamento de estacas caulinares de kiwi foi verificado mediante os seguintes tratamentos, aplicados sobre as bases das estacas: T1 H(2)0); T2 (NAA 300 ppm); T3 (IBA 300 ppm); T4 (NAA 300 ppm + B); T5 (IBA 300 ppm + B); T6 (NAA 0,5%-pó) e T7 (IBA 0,5%-pó). Após o tratamento das estacas, estas foram plantadas em...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Actinidia chinensis; NAA; IBA; Boro; Enraizamento; Estacas.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000300010

Supplemental irrigation using brackish water on maize in tropical semi-arid regions of Brazil: yield and economic analysis
Provedor de dados: 63
Autores: Cavalcante,Eduardo Santos; Lacerda,Claudivan Feitosa de; Costa,Raimundo Nonato Távora; Gheyi,Hans Raj; Pinho,Luciana Luzia; Bezerra,Francisco Mardones Sérvulo; Oliveira,Adriana Cruz de; Canjá,Juvenaldo Florentino.
ABSTRACT: Supplemental irrigation during dry spells could reduce maize yield losses in tropical semi-arid regions, notably in small farms. However, good quality water reserves are not sufficient to meet the demands of farming communities. Consequently, our objective was to evaluate the productivity and profitability of maize under different simulated rainfall scenarios, with and without supplemental irrigation (SI) with brackish water. The field experiments were carried out during the cropping seasons of 2018 and 2019 on Ultisol. The experiment followed a randomized block design in the split-plot scheme with four replicates. The plots were formed by simulating the water supply in the soil corresponding to four water scenarios (rainy, normal, drought and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Rainfed farming; Salinity; Supplementary irrigation; Biosaline agriculture.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000700601

Procedimento "MIXED" do SAS® para análise de modelos mistos
Provedor de dados: 63
Autores: Perri,Sílvia Helena Venturoli; Iemma,Antonio Francisco.
O modelo misto consiste numa importante classe de modelos que tem sido tradicionalmente analisada por meio de procedimentos da análise de variância. Nos modelos mistos, três aspectos são fundamentais: estimação e testes de hipóteses dos efeitos fixos, predição dos efeitos aleatórios e estimação dos componentes de variância. Na análise de modelos lineares mistos desbalanceados, a estimação dos componentes de variância é de fundamental importância e depende da estrutura de covariâncias e dos métodos de estimação utilizados. Nesse contexto, este artigo pretende apresentar os principais métodos de estimação e de análise utilizados no estudo de modelos lineares mistos com estruturas gerais de covariâncias nos efeitos aleatórios, disponíveis no procedimento...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: SAS; Procedimento MIXED; Modelo misto; Componentes de variância.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000400025

Cytogenetic data for Paspalum notatum Flügge accessions
Provedor de dados: 63
Autores: Dahmer,Nair; Schifino-Wittmann,Maria Teresa; Dall'Agnol,Miguel; Castro,Biane de.
Several species of the genus Paspalum L. are important forages, due their to quality, productivity and tolerance to environmental stresses. Chromosome numbers, meiotic configurations and pollen fertility were evaluated in a collection of 85 accessions of Paspalum notatum Flügge and in seven accessions of Pensacola (P. notatum var saurae). All P. notatum accessions were tetraploid, with 2n = 4x = 40, except one diploid accession, considered as an escape of Pensacola. All Pensacola plants had 2n = 2x = 20. Meiotic configurations at diakinesis and metaphase I varied among tetraploid accessions, from plants with only bivalents to plants with high frequency of quadrivalents. Pollen fertility varied from 82.5 to 95.9% among diploid accessions and from 72.4 to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Apomixis; Chromosome numbers; Meiotic configurations; Plant breeding; Pollen fertility.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000400009

Broiler surface temperature distribution of 42 day old chickens
Provedor de dados: 63
Autores: Nääs,Irenilza de Alencar; Romanini,Carlos Eduardo Bites; Neves,Diego Pereira; Nascimento,Guilherme Rodrigues do; Vercellino,Rimena do Amaral.
Broiler chickens in Brazil are generally reared from 1 to 42 days when they are exposed to procedures such as fasting, harvesting, crating and transport to slaughter. Maintaining homeostasis is of great importance for broiler survival under harsh environment especially prior to slaughter. Heat loss varies in the distinct parts of the body during the growth period, and it is related to the air temperature of the environment and to the amount of feather covering. This research aimed to study the surface temperature distribution using infrared thermographic image processing to characterize 42 day old broiler chicken surface temperature prior to slaughter. Broilers were reared for 42 days and prior to harvest and transport to slaughter the infrared surface...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Thermal comfort; Heat loss; Thermoregulation; Infrared thermography.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000500001

Variedades de cana-de-açúcar cultivadas in vitro com diferentes fontes de nitrogênio
Provedor de dados: 63
Autores: Donato,Virgínia M.T. Sabino; Andrade,Arnóbio Gonçalves de; Câmara,Terezinha Rangel.
O objetivo deste trabalho foi avaliar o comportamento de três variedades de cana-de-açúcar cultivadas in vitro em diferentes fontes de nitrogênio. O meio de cultura básico utilizado foi constituído dos sais minerais do MS, com as fontes de nitrogênio modificadas de acordo com o tratamento. Os meios de cultura elaborados foram o M1 constituído dos sais MS integral (controle); M2 no qual a fonte de nitrogênio do meio MS foi substituída por 4,39 g/l de glutamina; M3 com KNO3 como única fonte de nitrogênio e M4 com KNO3 do MS + 3,0 g/l de glutamina. A estes meios foram submetidas as variedades Co-997(V1), SP71-6949(V2) e SP70-1143 (V3), totalizando 12 tratamentos, que foram distribuídos de forma inteiramente casualisada com 5 repetições. A partir da análise...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cana-de-açúcar; Micropropagação; Glutamina.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000500035

Problemas metodológicos na obtenção da curva de retenção da água pelo solo
Provedor de dados: 63
Autores: Moraes,S.O.; Libardi,P.L.; Dourado Neto,D.
Para estudar a variabilidade tanto metodológica quanto espacial da Curva de Retenção de Água no Solo, coletaram-se amostras de solo com estrutura indeformada à profundidade de 25 cm em uma área de Terra Roxa Estruturada Latossólica (Rhodic Kanhapludalf) em Piracicaba,SP. A amostragem obedeceu a um arranjo com espaçamento regular de cinco metros, resultando numa malha quadriculada de vinte e cinco linhas e dez colunas, totalizando duzentos e cinqüenta pontos. Elaboraram-se 250 Curvas de Retenção por secamento, utilizando-se as tensões de 5 x 10²; l x 10³; 6 x 10³; l x 10(4) Pa (Funil de Placa Porosa) e 3 x 10(4); 8 x 10(4); 3 x 10(5) e 1,5 x 10(6) Pa (Câmara de Pressão de Richards), totalizando oito pontos por curva. Analisou-se a variabilidade metodológica...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Curva de retenção da água pelo solo; Variabilidade; Termodinâmica da água no solo.
Ano: 1993
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161993000300010

Seed technology research in Brazil: evolution and perspective
Provedor de dados: 63
Autores: França-Neto,J.B.; Oliveira,M.J.
A brief review about the historical evolution of seed technology research in Brazil is presented, pointing out the most important facts that contributed to the development of our seed production complex and research system. The role of PLANASEM and AGIPLAN and their cooperative projects with UFPEL, ESALQ and Mississippi State University is mentioned. Major seed related publications and events, such as seminars and congresses, which contributed to the development of seed research are included and analyzed. A survey of the most important lines of seed technology research conducted in Brazil is presented. Additionally, the Brazilian universities and research institutions that significantly contributed to seed research in the past 30 years are identified....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Seed programs; Seed publications; Seed events; Seed teaching.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000500003

Stock-scion interactions on growth and rubber yield of Hevea brasiliensis
Provedor de dados: 63
Autores: Cardinal,Átila Bento Beleti; Gonçalves,Paulo de Souza; Martins,Antônio Lúcio Mello.
Rubber tree cultivation [Hevea brasiliensis (Willd. ex Adr. de Juss.) Muell.-Arg.] uses mostly the budding propagation method, however the expected stand uniformity due to the use of vegetative propagation is theoretical, since high variation for yield and vigor is caused by rootstock influence. The objective of this study was to assess several combinations between clonal rootstocks and clone scions through diallel analysis, aiming at high productivity and vigor. Data consisted of five years of dry rubber yield and girth at panel opening from an experiment using a split-plot design with four replications, conducted at Pindorama, SP, Brazil, considering six rootstocks (GT 1, IAN 873, PB 235, RRIM 600, RRIM 701 and unselected seedlings) and six scions (GT 1,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Compatibility; Diallel analysis; Girth; Grafting; Rubber tree.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000300004

Sequential sampling of Euschistus heros (Heteroptera: Pentatomidae) in soybean
Provedor de dados: 63
Autores: Souza,Leandro Aparecido de; Barbosa,José Carlos; Grigolli,José Fernando Jurca; Fraga,Diego Felisbino; Moraes,Lílian Cristina; Busoli,Antonio Carlos.
Integrated pest management programs for soybean (Glycine max (L.) Merrill) must be based on efficient sampling plans for estimating the pest population. Based on the spatial distribution of the Neotropical brown stink bug Euschistus heros (Fabricius, 1794) found on soybean, it was possible to construct a sequential sampling plan for the survey of this insect found on soybean. The experiment was carried out during two growing seasons, 2010/2011 and 2011/2012, using the transgenic soybean cultivar M 7908 RR, in plots of 10,000 m² subdivided into 100 plots of 100 m² (10 m × 10 m). Nymphs &gt; 0.5 cm (4th and 5th instars) plus adults were counted weekly from five drop cloth technique samplings per plot. To evaluate insect dispersion in the area, the following...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Neotropical brown stink bug; Sampling method.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162014000600004

ADUBAÇÃO DO AMENDOIM (Arachis hypogaea L.) EM ÁREA DE REFORMA DE CANAVIAL
Provedor de dados: 63
Autores: GERIN,M.A.N; FEITOSA,C.T; RODRIGUES FILHO,F.S.O; PEREIRA,J.C.V.N.A; NOGUEIRA,S.S.S; IGUE,T.
Foram conduzidos nos anos agrícolas de 1986/87 a 1989/90, um total de seis experimentos de campo visando o estudo do efeito da adubação sobre a produção do amendoim em aréa de reforma de canavial. Os tratamentos estudados foram: 0, 30, 60, e 90Kg/ha de P2O5 na forma de superfosfato triplo e 0 e 30Kg/ha de K2O na forma de cloreto de potássio. O delineamento experimental utilizado foi o de blocos ao acaso com oito tratamentos, em fatorial PK (4x2) e quatro repetições. Não foi realizada a calagem em nenhuma área. As sementes foram inoculadas com estirpes selecionadas de bactérias do gênero Bradyrhizobium (SMS-729, SMS-400 e SMS-438). Os canteiros experimentais foram constituídos de 4 linhas de 5m de comprimento cada, espaçadas de 0,60m e com a distância entre...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amendoim; Adubação PK; Reforma de canavial.
Ano: 1996
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161996000100012

Funções estimáveis e hipóteses testáveis nos delineamentos ortogonais e parcialmente ortogonais com três fatores
Provedor de dados: 63
Autores: Santana,Denise Garcia de; Iemma,Antonio Francisco.
Em situações experimentais, não raro, o pesquisador depara-se com a impossibilidade de planejar experimentos balanceados. Um grave problema surge imediatamente, no tocante à interpretação das hipóteses testadas através dos sistemas estatísticos, principalmente quando há vários fatores envolvidos e se faz presente um alto grau de desbalanceamento. Diante disso, o objetivo deste trabalho foi o estudo das funções estimáveis e das hipóteses testáveis em delineamentos ortogonais e parcialmente ortogonais com três fatores, à luz do procedimento GLM do sistema estatístico SAS. Os efeitos principais para os quais o subespaço gerado é ortogonal a cada outro subespaço inerente aos demais fatores são estimáveis e, portanto, as hipóteses correspondentes são testáveis...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ortogonalidade; Ortogonalidade parcial; Estimabilidade.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000200014

Soil attributes and efficiency of sulfentrazone on control of purple nutsedge (Cyperus rotundus L.)
Provedor de dados: 63
Autores: Alves,Pedro Luís da Costa Aguiar; Marques Júnior,José; Ferraudo,Antonio Sergio.
In the soil, herbicides are submitted to absorption, leaching and degradation by physical, chemical and biological processes or absorbed by plants. All these processes are dependent on soil class and weather conditions and affect the product efficiency on weed control. The objective of this work was to investigate the influence of soil attributes on sulfentrazone efficiency for controlling purple nutsedge (Cyperus rotundus L. ). Soil samples from LVAd (Typic Haplustox), LVd, LVdf and LVef (Typic Haplustox and Typic Eutrustox), NVe (Rhodic Kandiustalf), and LVd (Typic Haplustox) were collected under two crop conditions aiming to have different clay, Fe oxides, and organic matter contents. The soil samples were submitted to granulometric, chemical and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Herbicide; Adsorption; Fe oxide; Classes of soils.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000300014

Reproductive biology and early establishment of Pinus elliottii var. elliottii in Brazilian sandy coastal plain vegetation: implications for biological invasion
Provedor de dados: 63
Autores: Bechara,Fernando Campanhã; Reis,Ademir; Bourscheid,Kurt; Vieira,Neide Koehntopp; Trentin,Bruna Elisa.
Pinus is the most invasive woody taxon, exceeded only by herbaceous plants. This study reports the reproductive biology and early establishment of Pinus elliottii Engelm. var. elliottii, describing its invasive properties in a protected natural area of the Brazilian coastal sandy plains. We evaluated the seed germination and rain, longevity of seed viability and the initial dynamics of the seedlings of Pinus elliottii var elliottii through field and laboratory experiments. We recorded a continuous seed rain of about 204.0 viable seeds m- 2 per year, with a 90 % germination rate. The seeds exhibited a low longevity of viability in the soil and a dense, permanent seedling bank that may explain the high levels of pine invasion. The environmental impact caused...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Slash pine; Germination; Seed bank; Seed rain; Seedling dynamics.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162013000200005

Enraizamento de estacas de lichia (Litchi chinensis Sonn.)
Provedor de dados: 63
Autores: Leonel,S.; Rodrigues,J. D.; Rodrigues,S. D.
Estudou-se os efeitos de auxilias exógenas e ácido bórico, no enraizamento de estacas de lichia (Litchi chinensis Sonn.). As estacas foram uniformizadas, com 25 cm de comprimento e 4 folhas cortadas pela metade. Cerca de 2,5 cm da base das mesmas foi mergulhado nos tratamentos: H2O; Boro 150 µg/ml; IBA 5.000 ppm, IBA 2.000 ppm; IBA 5.000 ppm + Boro 150 µg/ml; IBA 2.000 ppm + Boro 150 µg/ml; NAA 3.000 ppm; NAA 1.500 ppm; NAA 3.000 ppm + Boro 150 µg/ml; NAA 1.500 ppm + Boro 150 µ/g/ml. A estaquia foi realizada no mês de setembro (Hemisfério sul), sendo que as estacas foram colocadas em bandejas de isopor, tendo como substrato vermiculita e mantidas sob nebulização intermitente. Os resultados obtidos permitiram concluir que o IBA 5.000 ppm por 1 minuto foi o...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Reguladores vegetais; Ácido bórico; Callus; Lichieira; Estacas; Enraizamento.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000200022

Pork loin two-toning and drip loss in relation to steak cross-section anatomical position, plasma and exudate glucose
Provedor de dados: 63
Autores: Ramos,Patricia Maloso; Delgado,Eduardo Francisquine.
Perception of color and its relationship to water holding capacity are important for defining the yield and quality of the pork production process. The aim of this study was to identify the relationship among color measurements taken at various anatomical positions in the cross-sectional surface of pork loin steak, and measurements of fluid exudation and its glucose concentration, as well as the impact on these attributes due to plasma glucose at slaughter. Two assays were conducted sequentially: i) investigation of the surface color parameters at different anatomical positions in the pork loin cross-section and their relationship to general exudation; and ii) the effect of plasma glucose levels on surface color variables, drip loss and glucose exudate...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Longissimus dorsi; Color; Glycolytic metabolism; Quality.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162014000400002

Cytological aspects of incompatible and compatible interactions between rice, wheat and the blast pathogen Pyricularia oryzae
Provedor de dados: 63
Autores: Araujo,Leonardo; Soares,Juliana Moreira; Filippi,Marta Cristina Corsi de; Rodrigues,Fabrício Ávila.
ABSTRACT Blast, caused by the fungus Pyricularia oryzae, is an important disease affecting rice and wheat yield worldwide. This study investigated the cytological aspects of incompatible (non-host resistance) and compatible (host resistance) rice- (R_Po) and wheat- (W_Po) Pyricularia oryzae isolate interactions. Inoculations of rice and wheat with the R_Po and W_Po isolates of P. oryzae, respectively, were expected to be compatible interactions (host resistance), whereas inoculations of rice and wheat with the W_Po and R_Po isolates of P. oryzae, respectively, were considered to be incompatible interactions (non-host resistance). For the compatible interactions (rice-R_Po and wheat-W_Po), fungal hyphae penetrated and colonized the epidermal cells and also...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Magnaporthe oryzae; Oryza sativa; Triticum aestivum L; Blast disease; Host resistance.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000200177

Isotopic composition of maize as related to N-fertilization and irrigation in the Mediterranean region
Provedor de dados: 63
Autores: Lasa,Berta; Irañeta,Iosu; Muro,Julio; Irigoyen,Ignacio; Aparicio Tejo,Pedro María.
Nitrate leaching as a result of excessive application of N-fertilizers and water use is a major problem of vulnerable regions. The farming of maize requires high N fertilization and water inputs in Spain. Isotopic techniques may provide information on the processes involved in the N and C cycles in farmed areas. The aim of this work was studying the impact of sprinkler and furrow irrigation and N input on maize (Zea mays L.) yields, and whether isotopic composition can be used as indicator of best farming practices. Trials were set up in Tudela (Spain) with three rates of N fertilization (0, 240 and 320 kg urea-N ha-1) and two irrigation systems (furrow and sprinkler). Yield, nitrogen content, irrigation parameters, N fate and C and N isotope composition...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays L.; Furrow irrigation; Nitrogen; Sprinkler irrigation.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000200008

AVALIAÇÃO DE PESSEGUEIROS E NECTARINEIRAS INTRODUZIDOS NO BRASIL, PROCEDENTES DA FLÓRIDA, EUA
Provedor de dados: 63
Autores: BARBOSA,W.; OJIMA,M.; DALL'ORTO,F.A.C.; MARTINS,F.P.; DE CASTRO,J.L.; DOS SANTOS,R.R.
Avaliou-se o comportamento vegetativo e reprodutivo de vinte e dois pessegueiros e treze nectarineiras introduzidos no Brasil, provenientes da Universidade da Flórida, Gainesville, EUA. O material foi avaliado por três anos na Estação Experimental de Jundiaí, do IAC(23o08'S; 46o55'W), anotando-se as características: número de nós de gemas por metro de ramo e de gemas vegetativas e floríferas por nó; porcentagem de frutificação efetiva; ciclo de maturação dos frutos; coloração da película e polpa; textura e acidez da polpa e época de colheita. Verificou-se que os cinco cultivares e seleções que apresentaram grande quantidade de gemas foram: Sungem; Fla 3-4N; Fla 6-4; Fla 84-16N e Okinawa, com 51,1; 50,8; 45,8; 45,2 e 44,2 nós de gemas por metro de ramo...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pêssego; Nectarina; Germoplasma; Fenologia.
Ano: 1997
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161997000200007

PESQUISA DE Salmonella spp. EM LEITE CRU, LEITE PASTEURIZADO TIPO C E QUEIJO "MINAS FRESCAL" COMERCIALIZADOS NO MUNICÍPIO DE PIRACICABA - SP
Provedor de dados: 63
Autores: ÁVILA,C.R. de; GALLO,C.R.
Este trabalho foi conduzido para detectar a ocorrência de Salmonella spp. em leite cru, leite pasteurizado tipo C e queijo "Minas Frescal". Analisaram-se 19 amostras de cada produto de diferentes marcas comerciais, adquiridas em diversos estabelecimentos comerciais em Piracicaba, SP. Segundo o padrão de amostragem e métodos adotados, não foi detectada a presença de Salmonella spp. nas amostras analisadas. Durante este trabalho, foi possível observar que os 3 meios de isolamento utilizados: agar verde brilhante, agar bismuto sulfito e agar Salmonella-Shigella, apresentaram baixa seletividade, uma vez que permitiram o crescimento de bactérias não pertencentes ao gênero Salmonella. O mesmo ocorreu com os caldos tetrationato e selenito-cistina utilizados no...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Salmonella; Leite cru; Leite pasteurizado; Queijo "Minas Frescal".
Ano: 1996
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161996000100023

Estimativa do volume máximo de calda para aplicação foliar de produtos químicos na cultura de milho
Provedor de dados: 63
Autores: Basanta,Maria del Valle; Dourado-Neto,Durval; García y García,Axel.
Com o objetivo de estimar o volume de água por hectare retido na folhagem da cultura de milho para fins de quimigação (alvo folha), é proposto um modelo, tendo sido conduzido um experimento em que foi avaliada a interceptação de água pela parte aérea das plantas de milho sob diferentes lâminas de irrigação aplicadas via pivô central. Foi semeado um híbrido de milho, em três densidades, obtendo-se assim três arranjos espaciais diferentes. As avaliações foram realizadas em 3 estádios fenológicos: i) 4-5 folhas; ii) 8 folhas e iii) 14 folhas. A quantidade de água retida nas folhas das plantas foi estimada subtraindo à massa total da planta medida após a passagem do pivô, a massa de matéria seca e a água constitutiva das plantas. Para a análise estatística dos...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays; Quimigação; Irrigação; Modelagem.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000200014

Hydrocyclone for pre-filtering of irrigation water
Provedor de dados: 63
Autores: Soccol,Olívio José; Botrel,Tarlei Arriel.
The use of water containing suspended sediments causes serious problems to irrigation systems. Choosing the right filtering system type and capacity is essential to avoid increases in operational and maintenance costs of irrigation resulting from the need for cleaning and frequent component replacing. Pre-filters, such as the hydrocyclone, are important for their significant capability of retaining particles suspended in the water. Data on hydrocyclones performance for pre-filtering of irrigation water can be found in the literature, but research data in Brazil are scarce. Therefore, four Rietema type hydrocyclones (50 mm diameter) were constructed, one with circular-end and the other three presenting rectangular-end feeding tubes. The evaluation of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Filtration; Cyclones; Centrifugal separator.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000200002

Honey and propolis production, hygiene and defense behaviors of two generations of Africanized honey bees
Provedor de dados: 63
Autores: Garcia,Regina Conceição; Oliveira,Newton Tavares Escocard de; Camargo,Simone Cristina; Pires,Bruno Garcia; Oliveira,Carlos Antonio Lopes de; Teixeira,Rodrigo de Almeida; Pickler,Maricéia Ana.
Phenotypic characters of honeybees, relevant to beekeepers, can be evaluated by studying correlations between them, and the correlated characteristics can be evaluated in the short term to assist in monitoring of annual genetic progress. This work therefore aims to evaluate the production of honey and propolis, the hygiene and defensive behaviours of two generations of Africanized Apis mellifera (Hymenoptera, Apidae), to estimate the correlations between them and their heritability. We used 30 Langstroth beehives in apiaries in Marechal Cândido Rondon, Paraná State, Brazil. We used a method of drilling pupae to evaluate hygiene behaviour and the velveteen ball method to test defensive behaviour. We selected ten colonies which had the best honey and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Apis mellifera; Animal production; Ethology; Selection.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162013000200003

Genetic parameters and trends of morphometric traits of GIFT tilapia under selection for weight gain
Provedor de dados: 63
Autores: Reis Neto,Rafael Vilhena; Oliveira,Carlos Antônio Lopes de; Ribeiro,Ricardo Pereira; Freitas,Rilke Tadeu Fonseca de; Allaman,Ivan Bezerra; Oliveira,Sheila Nogueira de.
The main factor considered in breeding programs for fish is growth, which can be assessed in terms of a gain in either weight or body measurements. This study was undertaken to evaluate the morphometric traits of GIFT strain tilapia (Oreochromis sp.) selected for weight gain. The data set used contained information on 6,650 animals. The genetic values of 8,590 animals in a relationship matrix of five generations were predicted. The following morphometric measurements were evaluated: standard length; body depth and body width. Body area and volume were also calculated. Bi-character analyses involving morphometric traits were used to estimate (co)variance components. Heritability, larval and fingerling common environmental effects were estimated for each...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bayesian approach; Genetic correlation; Genetic gain; Heritability.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162014000400001

Genetic divergence among elephantgrass cultivars assessed by RAPD markers in composit samples
Provedor de dados: 63
Autores: Daher,Rogério Figueiredo; Pereira,Messias Gonzaga; Pereira,Antônio Vander; Amaral Jr.,Antônio Teixeira do.
Elephantgrass (Pennisetum purpureum Schum.) is native to regions of tropical Africa and was introduced in Brazil around 1920 through plantings imported from Cuba. It is currently one of the most widespread forage plants throughout the country. At first, there were two cultivars, Napier and Mercker, with well defined characteristics. New genotypes arose and it is believed that the large number of cultivars existing today in germplasm bank is due to duplicates. DNA markers for cultivar characterization are a very valuable tool, especially in situations where morphological and isoenzymatic markers have already been used as in the case of elephantgrass. Thus RAPD markers were used to estimate the genetic divergence among the Napier group elephantgrass...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pennisetum purpureum Schum.; Tocher optimization method; Dendrogram; Isoenzymatic markers.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000400001

Tecnologia do pescado de água doce: aproveitamento do pacu (Piaractus mesopotamicus)
Provedor de dados: 63
Autores: Szenttamásy,E.R.; Barbosa,S.M.V.B.; Oetterer,M.; Moreno,I.A.M.
Para o estudo da viabilidade do Pacu (Piaractus mesopotamicus) para processamento tecnológico, foram testados os processos de defumação, salga e secagem e enlatamento. Analisou-se também a farinha dos resíduos. Utilizou-se peixes provenientes de tanques de piscicultura do município de Piracicaba-SP e o produto final foi avaliado para o consumo na merenda escolar municipal. Foram feitas análises quanto aos teores de lipídeos, umidade, proteína e cinza. Os produtos processados por salga, defumação e enlatamento foram analisados também quanto ao teor de sal (NaCl); os defumados e enlatados foram submetidos a análise sensorial com avaliação de aparência, cor, aroma, sabor e textura. O pacu "in natura", defumado, salgado seco e enlatado apresentou, em...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Tecnologia do pescado; Processamento do pescado; Salga; Defumação; Enlatamento; Fish technology; Fish processing; Salted and dried fish; Smoked fish; Canned fish.
Ano: 1993
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161993000200019

Organic residue, limestone, gypsum, and phosphorus adsorption by lowland soils
Provedor de dados: 63
Autores: Andrade,Alex Teixeira; Fernandes,Luiz Arnaldo; Faquin,Valdemar.
Organic residue application is a low cost alternative to reduce the use of inorganic fertilizers and correctives. In order to study the effect of organic residues, limestone and gypsum application on phosphorus adsorption by lowland soils, four experiments were carried out. A Mesic Organosol (OY), a Melanic Gleysol (MG), a Haplic Gleysol (GX), and a Fluvic Neosol (RU) were used in a completely randomized design and factorial scheme (3 x 2), with five replicates: three soil amendment practices (limestone, gypsum and no corrective) and two levels of organic residue (with and without corral manure). Soil samples were incubated for 60 days, with and without organic residue incorporation. After this period, we applied the corrective and incubated the soil for...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Liming; Gypsum; Organic matter.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000200022

Degradação e formação de resíduos ligados de 14C-atrazina em Latossolo Vermelho Escuro e Glei Húmico
Provedor de dados: 63
Autores: Peixoto,Maria de Fátima da Silva Pinto; Lavorenti,Arquimedes; Regitano,Jussara Borges; Tornisielo,Valdemar Luiz.
Objetivou-se neste estudo avaliar a degradação e formação de resíduos ligados de 14C-atrazina em dois solos do Estado de São Paulo. Incubou-se 100 g dos solos Latossolo Vermelho Escuro (LE) e Glei Húmico (GH) durante 63 dias, em frascos de vidro de 500 cm3, aplicando-se 10,38 mg i.a. g-1 solo do produto radioativo. A determinação do 14CO2 desprendido foi feita semanalmente. Acetonitrila e água (4:1 v/v) foi usada como solução extratora dos resíduos do herbicida e o fracionamento da matéria orgânica baseou-se na solubilidade em ácidos e bases das frações húmicas. Os resíduos extraíveis foram analisados quanto a radioatividade pelo método de cromatografia de camada delgada. A mineralização foi um processo insignificante na detoxificação da atrazina no solo...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Atrazina; Degradação; Resíduos ligados.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000100024

Rhizobia and other legume nodule bacteria richness in brazilian Araucaria angustifolia forest
Provedor de dados: 63
Autores: Lammel,Daniel Renato; Brancalion,Pedro Henrique Santin; Dias,Carlos Tadeu Santos; Cardoso,Elke Jurandy Bran Nogueira.
The Araucaria Forest is a sub-type of the Atlantic Forest, dominated by Araucaria angustifolia, which is considered an endangered species. The understory has a high diversity of plant species, including several legumes. Many leguminous plants nodulate with rhizobia and fix atmospheric nitrogen, contributing to forest sustainability. This work aimed at bacteria isolation and phenotypic characterization from the root nodules of legumes occurring in Araucaria Forests, at Campos do Jordão State Park, Brazil. Nodule bacteria were isolated in YMA growth media and the obtained colonies were classified according to their growth characteristics (growth rate, color, extra cellular polysaccharide production and pH change of the medium). Data were analyzed by cluster...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: N fixation; Ombrophilous mixed forest; Symbiotic bacteria; Phenotypical characterization.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000400011

Conversion of ammonium to nitrate and abundance of ammonium-oxidizing-microorganism in Tropical soils with nitrification inhibitor
Provedor de dados: 63
Autores: Barth,Gabriel; Otto,Rafael; Almeida,Risely Ferraz; Cardoso,Elke Jurandy Bran Nogueira; Cantarella,Heitor; Vitti,Godofredo Cesar.
ABSTRACT The use of nitrification inhibitors (NIs; dicyandiamide - DCD) is an alternative to reduce oxidation of ammonium (NH4+-N) to nitrate (NO3–-N) in the soil, reducing NO3–-N losses from fertilization practices. Based on the hypothesis that DCD reduces conversion of NH4+-N to NO3–-N in tropical soils and inhibits ammonia oxidizing microorganisms (AOM) abundance, soils from the Piracicaba region, São Paulo, with different textures (sand, loam and clay) were incubated with ammonium sulphate (AS) and DCD. Contents of NH4+-N, NO3–-N, soil pH, and AOM abundance were quantified periodically. Ammonium sulphate increased AOM abundance in all soils, but AS+DCD presented AOM abundances similar to the control. During 90 days of incubation, the effectiveness of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: DCD; Nitrogen losses; Ammonium sulphate; Fertilizer.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000401404

Eliminação da produção de bacteriocinas em Erwinia e Pseudomonas fitopatogênicas
Provedor de dados: 63
Autores: Biagi,C.M.R. de; Azevedo,J.L.
Duas linhagens de bactérias fitopatogênicas do gênero Pseudomonas e duas do gênero Erwinia produtoras de bacteriocinas, foram submetidas a diferentes tratamentos visando estimar a estabilidade desse caráter. Houve eliminação da produção de bacteriocinas após tratamento com duas concentrações de brometo de etídio e a porcentagem de eliminação variou com o hospedeiro e com a concentração da droga. Não houve eliminação em temperaturas elevadas e também a preservação da linhagem por três anos em laboratório não causou perda do caráter. A eliminação da produção de bacteriocinas com brometo de etídio sugere que os genes envolvidos tenham localização plasmidiana.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bacteriocina; Erwinia; Pseudomonas.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000100024

Interspecific hybrids between Paspalum plicatulum and P. oteroi: a key tool for forage breeding
Provedor de dados: 63
Autores: Novo,Patricia Elda; Valls,José Francisco Montenegro; Galdeano,Florencia; Honfi,Ana Isabel; Espinoza,Francisco; Quarin,Camilo Luis.
ABSTRACT Grama-tio-pedro (Paspalum oteroi Swallen) is a rare stoloniferous grass of the Plicatula group of Paspalum, well adapted to continuous grazing in areas subject to seasonal flooding in the Pantanal region, in central western Brazil. The species is a facultative apomictic (asexual reproduction by seed) tetraploid, sporadically cultivated on Pantanal farms, propagated either by cuttings or seed. Due to its potential for extensive cultivation and forage quality, Grama-tio-pedro appears as a candidate for genetic improvement within the Plicatula group through plant breeding. We used a colchicine-induced sexual autotetraploid genotype of P. plicatulum Michx. to obtain interspecific hybrids using the apomictic species, P. oteroi, as pollen donor. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: DNA content; Apomixis; Fertility; Meiosis; Reproductive mode.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000400356

Soil bulk density and biomass partitioning of Brachiaria decumbens in a silvopastoral system
Provedor de dados: 63
Autores: Paciullo,Domingos Sávio Campos; Castro,Carlos Renato Tavares de; Gomide,Carlos Augusto de Miranda; Fernandes,Priscila Beligoli; Rocha,Wadson Sebastião Duarte da; Müller,Marcelo Dias; Rossiello,Roberto Oscar Pereyra.
Shade in silvopastoral systems improves the thermal comfort of animals, but it may also affect the pasture productivity and can contribute to soil compaction in the shaded areas due to the increase in the number of animals looking for comfort. The effect of grazing at various distances from tree rows (under the tree canopy, at 6 and at 12 m away from the trees) on the soil bulk density and on the aerial and root biomass of Brachiaria decumbens was evaluated in both the dry and the rainy seasons. The study was carried out on an Orthic Ferralsol in a randomized block design with two replications. Tree rows were composed of Eucalyptus grandis and Acacia mangium species, and the paddocks were submitted to a rotational stocking management, using Holstein (Bos...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Forage mass; Root mass; Soil compaction; Shading; Shoot/root ratio.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000500014

Association mapping in common bean revealed regions associated with Anthracnose and Angular Leaf Spot resistance
Provedor de dados: 63
Autores: Fritsche-Neto,Roberto; Souza,Thiago Lívio Pessoa Oliveira de; Pereira,Helton Santos; Faria,Luís Cláudio de; Melo,Leonardo Cunha; Novaes,Evandro; Brum,Itaraju Junior Baracuhy; Jannink,Jean-Luc.
ABSTRACT: Despite important biotic stresses to common bean, Anthracnose (ANT) and Angular Leaf Spot (ALS) can cause losses of up to 80 % and occur in more than 60 countries around the world. Genetic resistance is the most sustainable strategy to manage these diseases. Thus, we aimed to (1) identify new SNP markers associated with ALS and ANT resistance loci in elite common bean lines, and (2) provide a functional characterization of the DNA sequences containing the identified SNP markers. We evaluated 60 inbred lines, under field conditions, which represent the elite germplasm developed by the Embrapa common bean breeding program across 22 years, in terms of severity of the ALS and ANT. The lines were genotyped with 5,398 SNPs. Then, a Mixed Linear Model...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Colletotrichum lindemuthianum; Pseudocercospora griseola; Disease resistance; Elite lines; Marker-assisted selection.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162019001400321

Brazilian consumers' perception of tenderness of beef steaks classified by shear force and taste
Provedor de dados: 63
Autores: Delgado,Eduardo Francisquine; Aguiar,Ana Paula; Ortega,Edwin Moisés Marcos; Spoto,Marta Helena Fillet; Castillo,Carmen Josefina Contreras.
The knowledge of consumer perception of meat tenderness and taste is essential to forecast a Brazilian quality value-based beef market. This study aimed to verify perception of tender (WBSF &lt; 4.1 kg) from tough (&gt; 4.8 kg) strip loin steak or uncharacteristic (calcium-treated/Ca-IM) and normal (non-calcium/NO-Ca) meat taste by consumers according to gender, age, education and income levels. Steaks were previously classified by shear force measurements as tender or tough. Each consumer was served a paired sample of one tender and of one tough steak, which were either Ca-IM or NO-Ca treated before tenderness classification. Three hundred and eight consumers answered a nine-point intensity (tenderness) and hedonic (taste) scales evaluation questionnaire....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gender; Age; Education; Income; Calcium.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000300004

Risk of field cultivation of pickling cucumber caused by unfavorable sunshine duration conditions
Provedor de dados: 63
Autores: Kalbarczyk,Robert.
Solar energy, accessible to plants during sunshine from the sunrise to the sunset is of key importance in productivity of agrocenoses. The aim of the work was to determine risk of pickling cucumber cultivation caused by an unfavorable course of sunshine duration in Poland on the basis of a 40-year research period 1966-2005. The research into the subject was undertaken due to frequent occurrence of sunshine deficiency in Poland and its high temporal and spatial variability. Effect of solar conditions described by sunshine duration in the five development stages on the quantity of the total and marketable yield of cucumber with consideration of a linear trend of an independent variable was determined by means of multiple regression analysis. The accuracy of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Development; Growth; Reduction in yield; Solar conditions.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000300009

Indução e desenvolvimento de calos e embriões somáticos em mamoeiro
Provedor de dados: 63
Autores: Almeida,Eliane Pires de; Oliveira,Roberto Pedroso de; Dantas,Jorge Luis Loyola.
Este trabalho teve por objetivo estabelecer um protocolo para a indução e desenvolvimento de calos e embriões somáticos em mamoeiro (Carica papaya L. cv. Tainung n.1). Foram utilizados quatro tipos de explantes (hipocótilo com folhas cotiledonares, hipocótilo, folhas cotiledonares e epicótilo) e duas condições de cultivo (escuro e 16 horas de luz). A indução e o desenvolvimento de calos foram avaliados nos meios de cultura ½MS2, ½MS10 e HMH e a indução e o desenvolvimento de embriões somáticos nos meios ½MS e HMH1. O cultivo de explantes de hipocótilo com folhas cotiledonares em meio de cultura ½MS10, por 20 dias, sob condições de escuro, foi o mais adequado para a indução (100%) e o crescimento de calos friáveis embriogênicos. O cultivo desses calos em...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Carica papaya L. cv. Tainung n.1 embriogênese somática epicótilo hipocótilo com folhas cotiledonares 2; 4-D.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000100009

Avaliação química e nutricional do queijo mozzarella e iogurte de leite de búfala
Provedor de dados: 63
Autores: Verruma,M.R.; Oliveira,A.J. de; Salgado,J.M.
O presente trabalho teve por objetivo verificar a composição química e nutricional do queijo e iogurte elaborados com leite de búfala e comparados com aqueles elaborados com leite de vaca. Dos resultados obtidos foram obtidas as seguintes conclusões: o queijo tipo mozzarella e o iogurte elaborado com leite de búfala apresentaram níveis superiores em proteína, gordura, cinzas, cálcio e fósforo, estando relacionados com a composição química inicial do leite. Os níveis de digestibilidade in vitro dos queijos tipo mozzarella e iogurte de leite de búfala apresentaram resultados semelhantes aos elaborados com leite de vaca, indicando níveis adequados de digestibilidade para consumo humano.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Leite de búfala; Queijo; Iogurte; Digestibilidade in vitro.
Ano: 1993
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161993000300016

Efficiency of garden waste compost teas on tomato growth and its suppressiveness against soilborne pathogens
Provedor de dados: 63
Autores: Morales-Corts,María Remedios; Pérez-Sánchez,Rodrigo; Gómez-Sánchez,María Ángeles.
ABSTRACT: The use of compost teas is of great interest to sustainable agriculture. Aerated compost tea (ACT) and aerated vermicompost tea (AVT) originating from garden waste have been analytically characterized and tested in vitro and in vivo on tomato plants to determine their suppressive effect on Rhizoctonia solani and Fusarium oxysporum f. sp. lycopersici. The nitrogen (N, 3840 ppm) and potassium superoxide (K2O, 5800 ppm) contents were relevant in ACT. Both ACT and AVT were shown to contain indoleacetic acid IAA (80 - 20 mg L−1), salicylic acid (5.85 - 1.33 ng L−1) and humic acids (190 - 140 mg L−1). Direct confrontation assays against the pathogens showed that ACT had a high suppressive effect on F. oxysporum f. sp. lycopersici (relative growth of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Solanum lycopersicum; Compost and vermicompost; Growth effect; Sustainable agriculture.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162018000500400

Sexual polyploidization in red clover
Provedor de dados: 63
Autores: Simioni,Carine; Schifino-Wittmann,Maria Teresa; Dall'Agnol,Miguel.
Because sexual polyploidization broadens genetic basis and supply plant breeders with more variability for the selection process, it can be useful in red clover breeding. This paper reports results of three crossing cycles, starting from a parental generation of tetraploid red clover plants (female parent), and diploids from the Quiñiqueli cultivar, selected for production of more than 1% of giant pollen grains (male parent) aiming to obtain tetraploid plants to be used in red clover breeding programs. Crosses in the next generations were performed by mutual cross-pollinations. Chromosome number chimerism and high pollen sterility were detected in F1, F2 and F3, but there was a trend towards increasing seed production and seed viability along the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Trifolium pratense; Plant breeding; Triploid bridge; Unreduced gametes.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000100005

Between-season attraction of cotton boll weevil, Anthonomus grandis Boh. (Coleoptera: Curculionidae) adults by its aggregation pheromone
Provedor de dados: 63
Autores: Fernandes,Wedson Desidério; Carvalho,Sérgio Luis de; Habib,Mohamed.
The present study was undertaken to investigate the attractiveness of boll weevil adults by its aggregation pheromone under winter field conditions. Two experimental fields were utilized at "Casa Branca", SP, Brazil. For each one, three areas were established near the refuge vegetation, sparated 500 m from each other. Each area was divided in three sub-areas or blocks of 100 m² to receive pheromone applications (2.5 g per block). In addition to the pre-application counting, five additional evaluations were carried out after the pheromone applicaton. Ten randomized sampling points per block were considered in each evaluation process. A. grandis adults responded immediately to the pheromone applications, and were captured for 14 days . The highest level of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anthonomus grandis; Insecta; Cotton; Management.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000200003

Variability of water balance components in a coffee crop in Brazil
Provedor de dados: 63
Autores: Silva,Adriana Lúcia da; Roveratti,Renato; Reichardt,Klaus; Bacchi,Osny Oliveira Santos; Timm,Luis Carlos; Bruno,Isabeli Pereira; Oliveira,Julio César Martins; Dourado Neto,Durval.
Establishing field water balances is difficult and costly, the variability of their components being the major problem to obtain reliable results. This component variability is presented herein for a coffee crop grown in the Southern Hemisphere, on a tropical soil with 10% slope. It was observed that: rainfall has to be measured with an appropriate number of replicates; irrigation can introduce great variability into calculations; evapotranspiration, calculated as a remainder of the water balance equation, has exceedingly high coefficients of variation; the soil water storage component is the major contributor in error propagation calculations to estimate evapotranspiration; and that runoff can be satisfactorily controlled on the 10% slope through crop...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Component variability; Rainfall; Evapotranspiration; Soil water storage.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000200001

EFEITO DO NITROGÊNIO NO CULTIVO DE FEIJÃO IRRIGADO NO INVERNO
Provedor de dados: 63
Autores: AMBROSANO,E.J.; WUTKE,E.B.; AMBROSANO,G.M.B.; BULISANI,E.A.; BORTOLETTO,N.; MARTINS,A.L.M.; PEREIRA,J.C.V.N.A.; SORDI,G. DE.
Foram conduzidos ensaios de campo, sob irrigação por aspersão, nos municípios de Ribeirão Preto, Votuporanga (1990, 1991) e Pindorama (1992, 1993), em 3 diferentes tipos de solo, no período de maio a agosto, visando estudar o efeito do nitrogênio, aplicado sob várias formas, no cultivar de feijão IAC-Carioca. O delineamento experimental utilizado foi o de blocos ao acaso, com 5 repetições. Os resultados mostraram que o nitrogênio fornecido à cultura de feijão no inverno, aumenta a produção. No solo de baixa fertilidade, a produção foi maior quando o N foi parcelado. A combinação do parcelamento de N no solo e via foliar foi superior à aplicação parcelada exclusivamente via foliar. As doses únicas aplicadas em cobertura foram mais efetivas do que aplicadas...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Feijão; Phaseolus vulgaris L.; Nitrogênio; Parcelamento; Irrigação.
Ano: 1996
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161996000200024

Comparação de dietas artificiais e tipos de milho, para criação de Anagasta kuehniella (Zeller, 1879) (Lepidoptera: Pyralidae)
Provedor de dados: 63
Autores: Magrini,E.A.; Parra,J.R.P.; Haddad,M.L.; Botelho,Paulo Sérgio M.
O objetivo da pesquisa foi comparar o desenvolvimento biológico de Anagasta kuehniella (Zeller, 1879), visando à produção de Trichogramma, em dietas contendo milho amarelo (híbrido comercial AG-l 06) em relação à dieta com milho branco, ambas suplementadas com levedura de cerveja. O trabalho foi conduzido a 25±2°C, fotofase de 14 horas e UR de 60±10%. Foram analisados os seguintes parâmetros biológicos: duração e viabilidade do ciclo (ovo-adulto), peso médio de adultos, número médio de ovos, porcentagem de adultos deformados, número médio de ovos por dia e duração e viabilidade dos ovos. Levando-se em consideração os parâmetros estudados, pôde-se concluir que a dieta à base de farinha de milho amarelo acrescida de 3% de levedura pode ser utilizada em...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anagasta kuehniella; Biologia; Dietas artificiais.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000100011

Envelhecimento acelerado e deterioração controlada em sementes de tomate
Provedor de dados: 63
Autores: Panobianco,Maristela; Marcos Filho,Júlio.
Sementes de tomate apresentam alto valor comercial e, por esse motivo, merecem atenção especial quanto ao potencial fisiológico, principalmente devido às dificuldades para o armazenamento; para tanto, estudos dirigidos à determinação do vigor devem ser utilizados e intensificados. Este trabalho teve por objetivo estudar o envelhecimento acelerado e a deterioração controlada para avaliação do potencial fisiológico de sementes de tomate. Para tanto, cinco lotes de sementes, dos híbridos Debora Plus e Bruna, foram submetidos aos testes de germinação, emergência das plântulas em casa de vegetação, envelhecimento acelerado (empregando-se os períodos de 48 e 72 horas, a 38°C ou 41°C, com e sem o uso de solução saturada de NaCl) e deterioração controlada...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lycopersicon lycopersicum; Vigor; Potencial fisiológico; Geminação.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000300014

Regeneração de raízes de mudas de eucalipto em recipientes e substratos
Provedor de dados: 63
Autores: Barroso,Deborah Guerra; Carneiro,José Geraldo de Araújo; Leles,Paulo Sérgio dos Santos; Morgado,Ivan Ferreira.
O trabalho teve como objetivo verificar o potencial de regeneração de raízes (P.R.R.) e seu efeito sobre o desempenho após o plantio de mudas de Eucalyptus camaldulensis e E. urophylla, produzidas em tubetes e em blocos prensados, utilizando os seguintes substratos: 1) composto orgânico de bagaço de cana-de-açúcar + torta de filtro de usina açucareira (3:2; v:v) + 0,6% N (uréia) e 2) casca decomposta de eucalipto + vermiculita (7:3; v:v). O P.R.R. foi avaliado, após a poda das raízes laterais a 2 cm da raiz pivotante, através do número, comprimento, peso de matéria seca, área superficial, volume e ritmo de crescimento das raízes regeneradas. No campo, as mudas foram avaliadas quanto à sobrevivência, nos dois primeiros meses e quanto ao crescimento em...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Eucalyptus camaldulensis; E. urophylla.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000200006

Good Manufacturing Practices, Hazard Analysis and Critical Control Point plan proposal for distilleries of cachaça
Provedor de dados: 63
Autores: Bortoletto,Aline Marques; Silvello,Giovanni Casagrande; Alcarde,André Ricardo.
ABSTRACT: Cachaça poses many quality (appearance, taste, consumer acceptability) and safety hazards (chemical, metal, and microbiological contaminations during the process). In this work, an effort is made for the quality and safety analysis of cachaça, by describing and outlining the potential hazards in every step of the process. This study revealed that the critical control points (CCPs) involved in Good Manufacturing Practices (GMP) to prevent cachaça safety hazards are the stages of sugarcane growing, sugarcane harvesting, fermentation, distillation, and aging process. The most significant factors for both CCPs and critical points (CPs) that should be controlled are determined. The implementation of the Hazard Analysis and Critical Control Point...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Quality; Microbiological hazards; Chemical hazards; Sugar cane spirit.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162018000500432

Changes in trehalose content of baker's yeast as affected by octanoic acid
Provedor de dados: 63
Autores: Gutierrez,L.E.
Octanoic acid inhibited ethanolic fermentation by Saccharomyces cerevisiae (bakers yeast) and the trehalose accumulation, however did not affect the endogenous degradation of trehalose. This inhibition may be explained by the binding of octanoic acid to hexokinase or other proteins of plasma membrane because they are not necessary for endogenous fermentation. The degradation of trehalose may be due to an activation of trehalase.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Trehalose; Yeast; Saccharomyces; Octanoic acid.
Ano: 1993
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161993000300020

Colour and texture profiles of boneless reestructured dry-cured hams compared to traditional hams
Provedor de dados: 63
Autores: Costa,Marcela de Rezende; Bergamin Filho,Walter; Silveira,Expedito Tadeu Facco; Felício,Pedro Eduardo de.
Colour and texture, resultant of a complex process involving chemical, physical and enzymatic modifications, are important parameters for the acceptability of dry-cured hams. This study aimed to evaluate texture and colour instrumentally profiles of six types of dry-cured ham: two experimentally accelerated processed products, called CTC 3.5% and CTC 5.0% according to the initially added salt percentage; two imported (Spanish Serrano and Italian); and two Brazilian (Serrano type and Parma type) commercial products. The experimental process combined muscle-boning, transglutaminase addition, tumbling and moulding in stainless steel moulds, followed by drying and maturation. Evaluations were carried out using the Hunter colour system (A, 10º) and TPA (Texture...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Accelerated processing; Maturation time; Transglutaminase.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000200010

Preferência alimentar de percevejos por frutos e botões florais de genótipos de maracujazeiro
Provedor de dados: 63
Autores: Boiça Jr.,Arlindo Leal; Baldin,Edson Luiz Lopes; Oliveira,João Carlos de.
Visando estudar a preferência alimentar de Holhymenia histrio (Fabr.) (Hemiptera: Coreidae), por frutos e botões florais de diferentes genótipos de Passiflora spp., foram conduzidos ensaios de atratividade e consumo, sob condições de laboratório. Em teste com chance de escolha, frutos de P. giberti foram menos preferidos que os de P. edulis f. flavicarpa e P. alata; em testes sem chance de escolha, os percevejos preferiram igualmente os frutos dos genótipos testados. Nos testes com chance de escolha, utilizando-se botões florais, P. giberti e P. coccinea foram menos preferidos que P. edulis f. flavicarpa e P. alata.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Holhymenia histrio; Passiflora spp.; Insecta; Resistência de plantas; Atratividade.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000400024

IRRADIAÇÃO DE RESÍDUOS FIBROSOS COM FEIXES DE ELÉTRONS: EFEITOS NA COMPOSIÇÃO QUÍMICA E DIGESTIBILIDADE
Provedor de dados: 63
Autores: VITTI,D.M.S.S.; DEL MASTRO,N.L.; KIKUCHI,O.K.; NOGUEIRA,N. de L.
Amostras de bagaço de cana e resíduos de cultura de arroz e algodão foram irradiadas com feixes de elétron, em acelerador industrial tipo Dynamitron para verificar os efeitos da dose de irradiação na digestibilidade da matéria seca e na composição química e estrutural. Os tratamentos consistiram na aplicação de 200, 400, 600, 800 e l000kGy com ou sem aplicação de amônia gasosa para o bagaço de cana e 200kGy com e sem amônia para os resíduos de cultura. Após os tratamentos, o material foi seco e moído para a análise bromatológica completa. A digestibilidade in situ foi medida pela técnica envolvendo sacolas de náilon. As análises estruturais foram realizadas por microscopia óptica e eletrônica. A irradiação produziu uma redução nos conteúdos de fibra bruta...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bagaço de cana; Digestibilidade; Irradiação; Resíduos.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000200001

Efeitos de fitorreguladores e nitrato de potássio na germinação de sementes do limão 'volkameriano'
Provedor de dados: 63
Autores: Ono,E.O.; Leonel,S.; Rodrigues,J.D.
Foram estudados os efeitos de substâncias reguladoras de crescimento, bem como do nitrato de potássio (KNO3), na germinação de sementes do limão 'volkameriano' (Citrus volkameriana Pasq.). O experimento foi realizado em germinador, contendo papel de filtro umedecido com água destilada e gerbox, como meio para a germinação das sementes. Estas foram retiradas de frutas maduras, lavadas, secas à sombra e armazenadas durante 101 dias em câmara fria. Logo após, foram tratadas com os fitorreguladores e o KNO3 por 24 horas, conforme os tratamentos: H2O; 50 mg/l de GA3; 250 mg/l de GA3; 50 mg/l de GA4 + GA7 + fenilmetilaminopurina; 100 mg/l de GA4 + GA7 + fenilmetilaminopurina; 20 mg/lde fenilmetilaminopurina; 40 mg/lde fenilmetilaminopurina e 0,2% de KNO3. As...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Citrus volkameriana; Giberelinas; Citocininas; Nitrato de potássio; Germinação de sementes.
Ano: 1993
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161993000300003

Spatial variability of physical and chemical attributes of some forest soils in southeastern of Brazil
Provedor de dados: 63
Autores: Alvares,Clayton Alcarde; Gonçalves,José Leonardo de Moraes; Vieira,Sidney Rosa; Silva,Cláudio Roberto da; Franciscatte,Walmir.
Capão Bonito forest soils, São Paulo state, Brazil, have been used for forestry purposes for almost one century. Detailed knowledge about the distribution of soil attributes over the landscape is of fundamental importance for proper management of natural resources. The purpose of this study was to identify the variability and spatial dependence of chemical and physical attributes of Capão Bonito forest soils. A large soil database of regional land was raised and organized. Most of the selected variables were close to the lognormal frequency range. Soil texture presented a higher range in the A horizon, and the nugget effect and sill were greater in the B horizon. These differences are attributed to the parent material of the region (Itararé Geologic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Geostatistics; Semivariogram; Geographic information system; Soil management; Forestry precision.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000600015

Sewage sludge application on cultivated soils: effects on runoff and trace metal load
Provedor de dados: 63
Autores: Galdos,Marcelo Valadares; De Maria,Isabella Clerici; Camargo,Otávio Antonio de; Dechen,Sonia Carmela Falci.
The use of sewage sludge in agricultural soils as a macro and micronutrient source and as a soil conditioner has been one of the alternatives for its disposal. However, sewage sludge contains trace metals, which are potential sources of pollution. The goal of this study was to evaluate the effect of sewage sludge application on surface water contamination through runoff when it was applied in a soil cultivated with corn. The effect of sludge application on the concentration and load of copper, nickel and zinc and the volume of runoff water and sediment were evaluated. The experiment was set up in plots used to study erosion losses in Campinas, Sao Paulo State, Brazil. The soil is a clayey Rhodic Hapludox. Three treatments were studied: no sewage sludge,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cu; Ni; Zn; Erosion; Sediment.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000300012

Extratos aquosos de plantas e o comportamento do ácaro verde da mandioca
Provedor de dados: 63
Autores: Gonçalves,Manoel Eneas de Carvalho; Oliveira,José Vargas de; Barros,Reginaldo; Lima,Marcileyne Pessôa Leite de.
Extratos de plantas são uma alternativa promissora no controle de ácaros fitófagos. Neste trabalho estudou-se a bioatividade de extratos aquosos de nim, Azadirachta indica A. Juss. e cravo-da-índia, Syzigium aromaticum L., na biologia do ácaro verde da mandioca, Mononychellus tanajoa (Bondar). Larvas recém-eclodidas foram individualizadas em discos de folhas de mandioca previamente imersos nos extratos e em água destilada, e mantidas nestas condições até atingir a fase adulta. Após a emergência, as fêmeas foram individualizadas em discos não tratados e acasaladas com machos coletados da criação estoque. As avaliações foram efetuadas a cada 12 h. As duas maiores concentrações de nim (1,0 e 0,75g do pó de sementes de nim 100 mL-1 de água) deram os melhores...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mononychellus tanajoa; Tetranychidae; Acari; Planta inseticida; Praga.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000300006

Cations extraction of sandy-clay soils from cavado valley, portugal, using sodium salts solutions
Provedor de dados: 63
Autores: Silva,João Eudes da; Castro,Fernando.
Cases of contamination by metals in the water wells of the Cavado Valley in north-west Portugal can be attributed to the heavy leaching of clay soils due to an excess of nitrogen resulting from the intensive use of fertilisers in agricultural areas. This work focuses on the natural weathering characteristics of soils, particularly the clay material, through the study of samples collected near the River Cavado. Samples taken from various sites, after physico-chemical characterisation, were subjected to clay dissolution tests, using sodium salts of different ionic forces, to detect the relationship between certain physico-chemical parameters of water, such as pH, nitrate, chloride and sulphate content, in the dissolution of clay and the subsequent extraction...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nitrate; Sandy clay material; Natural weathering.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000200024

lattice: Easy construction of professional graphs for agricultural research in R environment
Provedor de dados: 63
Autores: Kozak,Marcin.
ABSTRACT: This paper shows how to apply the lattice package of R to create effective scientific graphs. The readers will learn basic notions of the package and ways to work with it in an easy way. The R code the paper provides will help them create various graphs, including a scatter plot, a box plot, a density plot, and a bar plot; with a little work, the code can be changed to make other graphs. The paper emphasizes the trellis display, a useful but still undervalued technique in scientific visualization.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Visualization; Charts; Software; Statistics.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000601602

Structural characteristics of marandu palisadegrass swards subjected to continuous stocking and contrasting rhythms of growth
Provedor de dados: 63
Autores: Mesquita,Priscila de; da Silva,Sila Carneiro; Paiva,Adenilson José; Caminha,Fábio Olegário; Pereira,Lilian Elgalise Techio; Guarda,Vítor Del'Álamo; Nascimento Júnior,Domicio do.
The concept of sward target has been used recently to characterise grazing management practices, but its efficiency to monitor and control sward structure questioned since it corresponds to a single sward structural feature, usually sward surface height. The objective of this experiment was to evaluate sward structure and its patterns of variation throughout the year on continuously stocked marandu palisadegrass swards maintained at 30 cm and subjected to contrasting rhythms of growth from January 2007 to April 2008. Treatments corresponded to three nitrogen application rates (150, 300 and 450 kg ha-1 of N) plus the control (no N fertilisation), and were allocated to experimental units according to a complete randomised block design, with four...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brachiaria brizantha; Nitrogen; Sward structure; Sward height; Grazing management.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000100004

Effectiveness of phosphate fertilizers of diffrent water solubilities in relation to soil phophorus adsorption
Provedor de dados: 63
Autores: Prochnow,Luís Ignácio; Quispe,Jack Fernando Santos; Francisco,Eros Artur Bohac; Braga,Graziela.
Phosphate fertilizers should match soil attributes to enhance agronomic effectiveness and recovery by plants. The purpose of this study was to test the agronomic effectiveness of P sources varying in water solubility on two soils differing widely in P adsorption capacity (PAC). Soils selected for the study were Oxisols with very low available P and presenting low and high PAC (Ox-LPAC and Ox-HPAC, respectively). Both were limed to pH 5.4 in a greenhouse study conducted utilizing corn as the test crop. Treatments consisted of the two soils interacting with five P sources (monocalcium phosphate - MCP, low-grade single superphosphate - LG-SSP, multimagnesium phosphate - MMP, Arad phosphate rock - PR and a P impurity in triple superphosphate - H14), and four...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Alternative phosphorus sources; Relative efficiency; Solubility.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000400004

Changes in the ultrastructure of soybean cultivars in response to manganese supply in solution culture
Provedor de dados: 63
Autores: Lavres Junior,José; Reis,André Rodrigues; Rossi,Mônica Lanzoni; Cabral,Cleusa Pereira; Nogueira,Neusa de Lima; Malavolta,Eurípedes.
The deleterious effects of Mn stress on many species have been studied, mainly concerning biochemical, physiological and growth parameters of plants. However, there are few studies relating the anatomical and ultrastructural changes in response to manganese (Mn) nutritional disorders, This study examined the leaf ultrastructure of Mn-inefficient (IAC-15, Santa Rosa) and Mn-efficient (IAC-Foscarin 31) soybean (Glycine max L.) genotypes in response to three rates of Mn (0.5, 2 and 200 µmol L-1) in the nutrient solution. Symptoms of Mn deficiency developed 12 days after transplanting in IAC-15 and Santa Rosa, followed by IAC-Foscarin 31 on the 15th day. Only IAC-15 and Santa Rosa leaves showed symptoms of Mn toxicity. The Mn concentration in leaves ranged...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chloroplast; Deficiency; Plant nutrition; Toxicity.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000300006

Efeitos do estádio de desenvolvimento da antera e da radiação gama na formação de calos derivados de anteras de tomate
Provedor de dados: 63
Autores: Brasileiro,Ana Christina R.; Willadino,Lilia; Guerra,Marcelo; Colaço,Waldeciro; Meunier,Isabelle; Camara,Terezinha R.
Este trabalho foi conduzido visando: (I) determinar a influência do estádio de desenvolvimento de anteras de tomate sobre a formação de calos e (II) analisar o efeito da radiação gama no cultivo in vitro de anteras. No primeiro experimento, anteras de híbridos de tomate IPA 5 x Rotam 4 (F1) foram cultivadas em três meios nutritivos. Apesar da formação de calos ter sido induzida em todos os estádios de desenvolvimento, variando de prófase I à micrósporo mononucleado, a freqüência de calos produzidos decresceu com o avanço do estádio de desenvolvimento e se apresentou de forma semelhante nos meios testados. Anteras contendo meiócitos em estádio de prófase I mostraram maior freqüência de formação de calos. Tanto o comprimento da antera quanto o do botão...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lycopersicon esculentum; Cultura de anteras; Raios gama; Tomate.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000400010

Broiler mortality and human behavior at work
Provedor de dados: 63
Autores: Alencar,Maria do Carmo Baracho de; Nääs,Irenilza de Alencar; Salgado,Douglas D'Alessandro; Gontijo,Leila Amaral.
Brazilian broiler industry adds a significant contribution to country's exports, employing around five million workers in the production chain. The human work involves multiple aspects, including values, beliefs related to work, cultural aspects, personality, motivation etc. The aim of this research was to analyze the associations between broiler accumulated mortality and workers' beliefs related to work, and influences of the supervisors. The study took place in the state of Paraná, Brazil involving 80 broiler integrate farms and 60 workers. A pre-elaborated questionnaire was applied to the workers containing questions related to their health and to some beliefs related to work, as an interview where they could express their feelings. The normal tasks...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Broiler production; Ergonomics; Human work.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000600003

Simulated multipolarized MAPSAR images to distinguish agricultural crops
Provedor de dados: 63
Autores: Silva,Wagner Fernando; Rudorff,Bernardo Friedrich Theodor; Formaggio,Antonio Roberto; Paradella,Waldir Renato; Mura,José Claudio.
Many researchers have shown the potential of Synthetic Aperture Radar (SAR) images for agricultural applications, particularly for monitoring regions with limitations in terms of acquiring cloud free optical images. Recently, Brazil and Germany began a feasibility study on the construction of an orbital L-band SAR sensor referred to as MAPSAR (Multi-Application Purpose SAR). This sensor provides L-band images in three spatial resolutions and polarimetric, interferometric and stereoscopic capabilities. Thus, studies are needed to evaluate the potential of future MAPSAR images. The objective of this study was to evaluate multipolarized MAPSAR images simulated by the airborne SAR-R99B sensor to distinguish coffee, cotton and pasture fields in Brazil....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: SAR; Crop discrimination; Multipolarized L-band; Radar; Remote sensing.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162012000300005

EFEITO DA DEFICIÊNCIA HÍDRICA E DA ADUBAÇÃO NITROGENADA NA PRODUTIVIDADE E NA  EFICIÊNCIA DO USO DE ÁGUA EM UMA  CULTURA DO FEIJÃO
Provedor de dados: 63
Autores: CALVACHE,A.M.; REICHARDT,K.; MALAVOLTA,E.; BACCHI,O.O.S.
Foi realizado experimento em um solo franco arenoso (Typic Haplustoll) na Estação Experimental da Universidade Central do Equador, "La Tola", em Tumbaco-Pichincha, Equador, entre julho e novembro de 1994, com o objetivo de identificar estádios da cultura de feijão que apresentam a menor sensibilidade ao estresse de água no solo, nos quais a irrigação pode ser omitida sem um significativo decréscimo na produção final, A região do experimento caracteriza-se por um clima temperado e seco (temperatura média anual de 16°C, umidade relativa média do ar 74% e chuva de 123 mm durante o período do experimento). Para alcançar os objetivos propostos, utilizou-se sete regimes de irrigação incluindo irrigação adequada durante todo o ciclo, irrigação deficiente durante...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Irrigação; Deficiência hídrica; Eficiência de uso de água; Sonda de neutrons; Feijão.
Ano: 1997
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161997000200019

Estresse por alumínio e por acidez em cultivares de soja
Provedor de dados: 63
Autores: Custódio,Ceci Castilho; Bomfim,Daniel Carlini; Saturnino,Sérgio Marques; Machado Neto,Nelson Barbosa.
Os solos tropicais e subtropicais são normalmente ácidos. O objetivo deste trabalho foi estudar o comportamento de quatro cultivares de soja com relação a germinação e vigor das plântulas quando submetidos a concentrações de alumínio (0; 0,25; 0,5; 1,0 e 1,5 mmol c dm-3 de Al3+) e de pH (7,0; 6,0; 5,5; 5,0 e 4,5). As concentrações de alumínio não afetaram a germinação e o peso seco de raiz, em contrapartida o comprimento de hipocótilo e de raiz , o peso seco da parte aérea e a classificação de vigor foram afetados. Na faixa entre 0,25 e 1,0 mmol c dm-3 ocorreu estímulo para o desenvolvimento da plântula (comprimento de hipocótilo e raiz). Estatisticamente, o comprimento de raiz teve seu maior desenvolvimento no tratamento de 1,0 mmol c dm-3 Al3+. Os...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycine max; Tolerância; Germinação; Vigor.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000100021

Carbohydrate production and transport in cotton cultivars grown under boron deficiency
Provedor de dados: 63
Autores: Bogiani,Julio Cesar; Amaro,Amanda Cristina Esteves; Rosolem,Ciro Antonio.
An adequate supply of boron (B) is required for the optimal growth and development of cotton (Gossypium hirsutum L.) plants, but the low phloem mobility of B limits the possibilities of correcting B deficiency. There are indications that different cotton cultivars could have different responses to B deficiency. The differences in responses of cotton cultivars to B regarding photoassimilate production and transport were studied in a greenhouse experiment with nutrient solution. Treatments consisted of three cotton cultivars (FMT 701, DP 604BG and FMX 993) and five concentrations of B (0.0, 2.5, 5.0, 10.0 and 20.0 µmol L−1). Sampling began at the phenological stage B1 (first square) and continued for four weeks. The leaf area and the number of reproductive...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Micronutrient; Nonstructural carbohydrates; Photosynthesis; Transpiration.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162013000600010

Software for micromorphometric characterization of soil pores obtained from 2-D image analysis
Provedor de dados: 63
Autores: Cooper,Miguel; Boschi,Raquel Stucchi; Silva,Vitor Boschi da; Silva,Laura Fernanda Simões da.
ABSTRACT Studies of soil porosity through image analysis are important to an understanding of how the soil functions. However, the lack of a simplified methodology for the quantification of the shape, number, and size of soil pores has limited the use of information extracted from images. The present work proposes a software program for the quantification and characterization of soil porosity from data derived from 2-D images. The user-friendly software was developed in C++ and allows for the classification of pores in terms of size, shape, and combinations of size and shape. Using raw data generated by image analysis systems, the software calculates the following parameters for the characterization of soil porosity: total area of pore (Tap), number of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil structure; Soil thin sections; Soil porosity data; Pore morphology.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000400388

Performance of Santa Ines lambs fed diets of variable crude protein levels
Provedor de dados: 63
Autores: Rocha,Márcia Helena Machado da; Susin,Ivanete; Pires,Alexandre Vaz; Fernandes Jr.,Jalme de Souza; Mendes,Clayton Quirino.
Differences among dietary protein levels suggested in the literature point out to the need for better evaluation of protein requirements of growing lambs, raised in drylot on a high-concentrate diet. This study evaluates the influence of crude protein (CP) levels in high concentrate diets on performance and carcass traits of ram lambs, confined for 56 days. Forty eight (48) Santa Ines lambs (initial body weight 18.4 ± 0.4 kg; 86 ± 2 days old) were fed 4 experimental diets containing 14, 16, 18 or 20% CP, in a completely randomized block design. Diets consisted of 80% concentrate and 20% sugarcane bagasse. There were no differences in average daily gain: values of 228, 220, 230 and 231 g d-1 were obtained for diets containing 14, 16, 18 and 20% CP,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Carcass; Drylot; Hair sheep; High grain diet.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000200003

Utilization of trash: a view from the agronomic and industrial perspective
Provedor de dados: 63
Autores: Sordi,René de Assis; Manechini,Celio.
Tipo: Info:eu-repo/semantics/other
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162013000500002

Tratamento fungicida de sementes de milho contra fungos do solo e o controle de Fusarium associado às sementes
Provedor de dados: 63
Autores: Pinto,Nicésio Filadelfo Janssen de Almeida.
As sementes de milho infectadas por fungos constitue importantes fontes de inóculos, cujos patógenos podem causar podridões de sementes, morte de plântulas em pré e pós-emergência e podridões radiculares. Ademais, em condição de solo frio e úmido há maior exposição das sementes ao ataque de fungos do solo. Assim, estudou-se a eficiência dos fungicidas captan (120,0; 90,0 e 60,0 g i.a. 100 kg-1 de sementes), thiram (140,0) formulado em PM e SC, thiabendazole (20,0), thiram + thiabendazole (75,0 + 10,0) e carboxin + thiram (75,0 + 75,0) no tratamento de sementes de milho da cultivar BR 106. Foram avaliadas as características : sanidade de sementes; emergência de plântulas no campo, em solo esterilizado; bem como as emergências nos testes de frio em solo de...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays; Fusarium moniliforme; Germinação; Patologia de semente.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000300017

Enraizamento de estacas de crisântemo [Dendranthema morifolium (RAMAT.) TZVELEV] tratadas com ácido indolbutírico veiculado em talco
Provedor de dados: 63
Autores: Cuquel,F.L.; Mimani,K.
O presente trabalho foi realizado com o propósito de avaliar a qualidade do enraizamento de estacas de crisântemo tratadas com ácido indolbutírico (IBA) veiculado em talco sob diversas dosagens, transplantadas em três idades diferentes e seus efeitos posteriores no desenvolvimento de plantas. Estacas de crisântemo do cultivar Yellow Reagan 622 foram tratadas com IBA nas dosagens de 0, 500, 1000 e 2000 ppm. Foram efetuadas avaliações do aspecto visual e do peso de matéria seca das estacas enraizadas com 10, 12 e 14 dias de enraizamento. Adicionalmente, foram transplantadas mudas, que receberam os mesmos tratamentos com IBA, após 10, 12 e 14 dias de enraizamento, para o local de desenvolvimento de plantas, onde permaneceram até o momento de colheita das...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Crisântemo; Ácido indolbutírico (IBA); Regulador de crescimento; Enraizamento de estacas.
Ano: 1994
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000100005

Air-assisted boom sprayer and spray deposition on bean plants
Provedor de dados: 63
Autores: Bauer,Fernando Cesar; Raetano,Carlos Gilberto.
The development of safe pesticide application techniques with low volume rates, frequency and spray drift, along with the need to obtain better control level of crop pest control levels, justify the air-assistance in boom sprayers. The aim of this research was to evaluate the spray deposition on bean plants with different nozzles and volume rates by air-assisted and non-assisted sprayers. A completely randomized experiment was carried out using copper oxide as a tracer (50% metalic copper) for deposit evaluation. The artificial targets were fixed on the upper and under-side of the leaflets, at the top and lower third of the same plants under the spray boom. After application, targets were washed individually with an extracting solution of nitric acid (1.0...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phaseolus vulgaris; Application technique; Tracer; Boom sprayer.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000200002

Controle da infestação natural de ceratitis capitata (Wied., 1824) (Diptera, Tephritidae) em pêssegos(Prunus persica) através das radiações gama
Provedor de dados: 63
Autores: Arthur,V.; Caceres,C.; Wiendl,F.M.; Wiendl,J.A.
Determinou-se a dose desinfestante de radiações gama para pêssegos, Prunus persica, infestados com larvas da mosca do Mediterrâneo, Ceratitis capitata. Utilizaram-se frutas de procedência conhecida no campo fazendo-se uma amostragem prévia, constatando-se que cada fruta continha em média nove larvas do último ínstar da mosca praga. As frutas foram irradiadas em uma fonte de Cobalto-60 com as seguintes doses de radiação gama: 0 (test.), 25, 50, 100, 200, 400, 600, 800, 1000 e 1200 Gy, sob uma taxa de 58 Gy por minuto. Após a irradiação as frutas foram colocadas em câmaras climatizadas com a temperatura variando entre 23 e 27°C e a umidade relativa variando entre 65 e 75%. Aguardou-se que as larvas deixassem as frutas e se transformassem em pupas e adultos....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Irradiação de aumentos; Mosca do Mediterrâneo; Quarentena; Ceratitis capitata; Prunus persica.
Ano: 1993
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161993000300001

Practical method for germination of Araucaria angustifolia (Bert.) O. Ktze. seeds
Provedor de dados: 63
Autores: Moreira-Souza,Milene; Cardoso,Elke Jurandy Bran Nogueira.
The germination of seeds of Araucaria angustifolia (Brazilian Pine) is generally a slow and fastidious process that causes loss of many seeds because of the incidence of pathogens. The objective of this study was to evaluate whether seeds with cut edges present greater germination percentages or precocity when compared to untreated, normal seeds. The experimental design was completely randomized design with 100 pre-cut and 100 non-treated seeds. The experiment was installed twice, in 1998 and 1999, from fresh seeds. Pre-cut seed germination was higher: 92 and 95% respectively, whereas whole seed germination was 60 and 64% in the two experiments. Seedlings originated from pre-cut seeds were uniform and showed less fungal contaminants.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Araucaria angustifolia; Germination; Seeds.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000200025

Nitrogen contributions of legume roots to cabbage nutrition
Provedor de dados: 63
Autores: Vargas,Thiago de Oliveira; Diniz,Ellen Rúbia; Santos,Ricardo Henrique Silva; Urquiaga,Segundo; Cecon,Paulo Roberto.
The effects of roots are generally not considered in studies assessing crop responses to green manure. However, measuring such effects can contribute to a better understanding of crop rotation. In two experiments, we evaluated the content of legume-N in crop tissue and the fertilizer value of the roots and shoots of two legume species. Roots, shoots, or whole plants of the legumes sunhemp (Crotalaria juncea) and jack beans (Canavalia ensiformis) were cropped as green manure to supply nitrogen to cabbage crops (Brassica oleracea var. capitata). The principle of the A-value technique was applied to estimate the fertilizer value of each plant part. In a pot experiment, both the content of legume-N in cabbage and the fertilizer value of the whole plant was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brassica oleracea var. capitata Crotalaria juncea Canavalia ensiformis 15N; Green manure.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162013000600006

Orbital and laboratory spectral data to optimize soil analysis
Provedor de dados: 63
Autores: Fiorio,Peterson Ricardo; Demattê,José Alexandre M.
Traditional soil analyses are time-consuming with high cost and environmental risks, thus the use of new technologies such as remote sensing have to be estimulated. The purpose of this work was to quantify soil attributes by laboratory and orbital sensors as a non-destructive and a non-pollutant method. The study area was in the region of Barra Bonita, state of São Paulo, Brazil, in a 473 ha bare soil area. A sampling grid was established (100 × 100 m), with a total of 474 locations and a total of 948 soil samples. Each location was georeferenced and soil samples were collected for analysis. Reflectance data for each soil sample was measured with a laboratory sensor (450 to 2,500 nm). For the same locations, reflectance data was obtained from a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Remote sensing; Soil attributes; Soil reflectance.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000200015

Ruminal parameters analyzed in remaining digestion residue of roughages in the in vitro/gas system
Provedor de dados: 63
Autores: Campos,Fábio Prudêncio de; Sampaio,Alexandre Amstalden Moraes; Vieira,Paulo de Figueiredo; Bose,Max Lázaro Vieira; Sarmento,Patrícia.
Animal performance is the most direct measure in the evaluation of feed quality. However, performance data are often insufficient to determine possible interactions that may take place in the ruminal environment. The purpose of the present trial was to evaluate the possible associative effects on the concentrations of volatile fatty acids (VFAs), ammoniacal nitrogen (N-NH3) and pH in the remaining liquid fraction from the dry matter (DM) digestion for exclusive roughages: sugarcane (SC), 60- (EG60) and 180-day elephantgrass (EG180), and corn silage (SIL), as well as for combined roughages: sugarcane+corn silage (SCSIL), sugarcane+60-day elephantgrass (SCEG60), sugarcane+180-day elephantgrass (SCEG180), corn silage+60-day elephantgrass (SILEG60), corn...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: VFAs; N-NH3; Elephantgrass; Corn silage; Sugarcane.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000300024

Limit between stages I and II of a seed imbibition curve
Provedor de dados: 63
Autores: Pinho,Sheila Zambello de; Carvalho,Lídia Raquel de; Delachiave,Maria Elena Aparecida.
A knowledge of the imbibition stages shown by different species, is essential in research projects aiming at improvement of seed quality by treatments such as osmotic conditioning, initial wetting, and the use of bioregulators. The objective of this study was to establish a methodology to determine the limit between the first and second stages of the process, considering the model W = f(t) - (a - w0)exp(-kt), using statistical tests. This limit was determined using an asymptotic distribution of an estimator function. The data point beyond which the difference (W*) is no longer significant was determined using Student's T statistics. The model is &lt;img border=0 id="_x0000_i1026" src="../../../img/revistas/sa/v61n1/a03img01.gif" align=absmiddle &gt; or =...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Water absorption; Non-linear regression; Germination.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000100003

Morphogenetic and structural comparative characterization of tropical forage grass cultivars under free growth
Provedor de dados: 63
Autores: Silveira,Márcia Cristina Teixeira da; Nascimento Júnior,Domicio do; Silva,Sila Carneiro da; Euclides,Valéria Pacheco Batista; Montagner,Denise Bataglin; Sbrissia,André Fischer; Rodrigues,Carlindo Santos; Sousa,Bráulio Maia de Lana; Pena,Karine da Silva; Vilela,Hélio Henrique.
Understanding of the morphogenetic characteristics allows comprehension of aspects related to the form and function of forage plants, providing opportunities to identify potentially high productive plants and distinct defoliation management requirements. The objective of this experiment was to carry out a comparative study of ten tropical forage grasses using morphogenetic and structural variables. Treatments corresponded to grasses of the Panicum genus (P. maximum cultivars Tanzânia and Mombaça) and the Brachiaria genus (B. brizantha cultivars Piatã, Marandu, Xaraés, Capiporã and Arapoty; B. decumbens cultivar Basilisk; B. humidicola cultivars Comum and Tupi), evaluated under free growth conditions.. Response variables were leaf appearance and elongation...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brachiaria; Panicum; Morphogenetic and structural variables.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000200002

Open legacy soil survey data in Brazil: geospatial data quality and how to improve it
Provedor de dados: 63
Autores: Samuel-Rosa,Alessandro; Dalmolin,Ricardo Simão Diniz; Moura-Bueno,Jean Michel; Teixeira,Wenceslau Geraldes; Alba,José Maria Filippini.
ABSTRACT: Spatial soil data applications require sound geospatial data including coordinates and a coordinate reference system. However, when it comes to legacy soil data we frequently find them to be missing or incorrect. This paper assesses the quality of the geospatial data of legacy soil observations in Brazil, and evaluates geospatial data sources (survey reports, maps, spatial data infrastructures, web mapping services) and expert knowledge as a means to fix inconsistencies. The analyses included several consistency checks performed on 6,195 observations from the Brazilian Soil Information System. The positional accuracy of geospatial data sources was estimated so as to obtain an indication of the quality for fixing inconsistencies. The coordinates...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Free Brazilian Repository for Open Soil Data; PronaSolos; Pedometrics; Soil data recovery; Digital soil mapping.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000101401

EFEITO DE MODOS E ÉPOCAS DE APLICAÇÃO DE GESSO E CALCÁRIO SOBRE A CULTURA DO FEIJOEIRO (Phaseolus vulgaris L.) cv. CARIOCA-80
Provedor de dados: 63
Autores: GALON,J.A; BELLINGIERI,P.A; ALCARDE,J.C.
Instalou-se sobre um latossolo vermelho-escuro textura média, um experimento cujo objetivo foi avaliar a influência de modos e épocas de aplicação de gesso e de calcário sobre algumas características nutricionais e tecnológicas da cultura do feijoeiro irrigado. Utilizou-se no experimento o delineamento em blocos casualizados em esquema fatorial (4x3)+2 com quatro repetições, correspondendo a 4 modos de aplicação de gesso e/ou calcário, 3 doses de gesso e 2 tratamentos adicionais. Os resultados mostraram que: o uso do gesso proporcionou maiores teores de Ca nos grãos e consequentemente maior tempo para o seu cozimento. A associação gesso e calcário propiciou aumento no teor de S das folhas e também no peso de 100 grãos, quando comparado à utilização de...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Extração; Nutrientes; Reatividade; Irrigação.
Ano: 1996
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161996000100017

Biochemical and isoenzyme analyses of elephant grass, Pennisetum purpureum (Schum) varieties
Provedor de dados: 63
Autores: Bach,E.E.; Alcântara,V.B.G.; Alcântara,P.B.; Veasey,E.A.
This study characterized seven Pennisetum purpureum varieties, namely v. Anão, Bajra, Cameroon, Guaçu, Roxo, Taiwan A-144 and Uruckwami, through biochemical analyses, including protein, glucose and fructose contents, and polyacrylamide gel electrophoresis using the esterase system, by sampling 30, 60, 90, 120 and 150 day-old leaves. The number of nodes per stem and the percentage of bud emergence were also recorded. Variety Taiwan A-144 presented the highest number of nodes per stem and percentage of emerging buds. Protein concentration decreased gradually after 60 days for all varieties, except for Anão. Variety Guaçu presented the highest level of glucose in 90 day-old plants, whereas Cameroon presented the highest levels at 120 and 150 days. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Electrophoresis; Reducing sugars; Proteins; Elephant grass; Pennisetum purpureum.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000300019

Yield and fruit quality of industrial tomato under saline irrigation
Provedor de dados: 63
Autores: Campos,Carlos Alberto Brasiliano; Fernandes,Pedro Dantas; Gheyi,Hans Raj; Blanco,Flávio Favaro; Gonçalves,Cira Belém; Campos,Selma Aparecida Ferreira.
Industrial tomato is the most important vegetable crop of the Brazilian agribusiness. Few researches have evaluated the tolerance of this crop to saline stress. In this study, the effects of five levels of salinity of the irrigation water (1, 2, 3, 4, and 5 dS m-1) and two equivalent proportions of Na:Ca:Mg (1:1:0.5 and 7:1:0.5) were tested on yield and quality of fruits of industrial tomato, cultivar IPA 6. Seedlings were transplanted in rhizotrons and grown under plastic covering until fruit ripening. Volume of water for daily irrigations was determined by the difference between the applied and drained volume in the previous irrigation. Unitary increase of water salinity above 1 dS m-1 reduced the commercial and total yield by 11.9 and 11.0%,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lycopersicon esculentum Mill.; Salinity; Pulp yield; Water quality; Sodium.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000200006

Dynamic systems approach assess and manage water resources in river basins
Provedor de dados: 63
Autores: Sánchez-Román,Rodrigo Máximo; Folegatti,Marcos Vinicius; Orellana González,Alba María Guadalupe; Silva,Rogério Teixeira da.
The Piracicaba, Capivari and Jundiaí River Basins (RB-PCJ) are located in the States of Minas Gerais and São Paulo, Brazil. By 2005, 5.8% of Brazil's General National Product-GNP was produced there. Such economic development has created a huge demand for water resources. The availability of water resources was assessed by running a dynamic systems simulation model to manage these resources in the RB-PCJ (WRM-PCJ), considering five 50-year simulations. WRM-PCJ was developed as a tool to aid the RB-PCJ Watershed Committee. The model computes water supply, demands, and contamination load from several consumers. When considering a Business-as-Usual scenario, by 2054, water demands will have increased up to 76%, 39% of the available water will come from...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Water stress; Water management; Watershed; Modeling.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000400001

Lime and gypsum application on the wheat crop
Provedor de dados: 63
Autores: Caires,Eduardo Fávero; Feldhaus,Itacir Cesar; Barth,Gabriel; Garbuio,Fernando José.
Root growth and crop yield can be affected by chemical modifications of the soil profile owing to lime and gypsum applications. A field trial was carried out on a dystrophic Clayey Rhodic Hapludox at Ponta Grossa, PR, Brazil, aiming to evaluate lime (without or with incorporation into the soil) and gypsum effects on root growth, mineral nutrition and grain yield of wheat (cv. OR 1). A randomized complete block design was used, with three replications, in a split-plot experiment. Treatments with dolomitic limestone (without lime and 4.5 t ha-1 of lime applied on the surface, in total rate and 1/3 of the requirement per year during 3 years, or incorporated into the soil) were applied in July 1998 (main plots) and the rates of gypsum (0, 3, 6 and 9 t ha-1) in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Triticum aestivum L.; Root growth; Calcium; Sulphur; No-tillage system.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000200023

APLICAÇÃO DO MÉTODO DE BALANÇO DE CALOR NA DETERMINAÇÃO DA TRANSPIRAÇÃO DE MUDAS DE LIMOEIRO
Provedor de dados: 63
Autores: TREJO-CHANDIA,J.E.; ANGELOCCI,L.R.; OLIVEIRA,R.F. de.
O método de balanço de calor é usado para monitorar fluxo de seiva em plantas de diversas espécies. Neste trabalho, estudou-se o desempenho e aplicabilidade do método, em mudas de limoeiro com diâmetros em torno de 18 mm. Os sensores foram avaliados em plantas envasadas, em casa de vegetação, sob condições naturais de temperatura e radiação solar. O desempenho do método foi avaliado comparando-se o fluxo de massa computado e as medidas gravimétricas de perda de massa, fazendo-se depois, análise de regressão. Os resultados indicam que os sensores tiveram uma precisão de 8% na escala horária e 11% na escala diária. A constante de tempo foi de 12 minutos, o que é um indicativo de que o método é adequado para medir fluxo de seiva em mudas de citros com boa...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sensores de medida; Fluxo de seiva; Transferência de calor.
Ano: 1997
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161997000200018

Response of the grass-cutting ant Atta capiguara Gonçalves, 1944 (Hymenoptera: Formicidae) to sugars and artificial sweeteners
Provedor de dados: 63
Autores: Boaretto,Maria Aparecida Castellani; Forti,Luiz Carlos; Lopes,Juliane Floriano Santos; Nagamoto,Nilson Satoru; Andrade,Ana Paula Protti de; Moreira,Aldenise Alves; Viana,Anselmo Eloy Silveira; Ramos,Vânia Maria.
Using of toxic baits made of dehydrated citric pulp to control grass-cutting ants can lead to unsatisfactory results because of the low attractiveness of the substrate to worker ants. This work aimed to identify attractive substances, with potential for incorporation in a matrix of granulated baits for grass-cutting ants, among several kinds of sugars and substances used in artificial sweeteners. Experiments were carried out in mature nests of Atta capiguara (Hym.: Formicidae) set in pasture. Studied substances were sucrose, fructose, soluble starch, raffinose, maltose, lactose, sorbose, cellobiose, arabinose, xylose, glucose, galactose, rhamnose, arabinose, melezitose, saccharine and cyclamate (at 5.0% w/v). Later, on maltose, xylose, sucrose, fructose...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Attini; Myrmicinae; Grass-cutting ants; Bait.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000300014

POTENCIAL DA ÁGUA NO SISTEMA SOLO - PLANTA ESTIMADO ATRAVÉS DA FASE DE VAPOR
Provedor de dados: 63
Autores: Villa Nova,N.A; Bacchi,O.O.S; Reichardt,K.
O potencial da água, estimado através do equilíbrio líquido - vapor em diferentes situações de solo, de planta ou de atmosfera é tratado com embasamento termodinâmico, com o intuito de apresentar um maior rigor nas formulações e nos conceitos e de esclarecer pontos geralmente tratados de forma mais superficial. Apesar de se tratar de assunto clássico, encontrado na maioria dos textos sobre o assunto, é do entendimento dos autores de que a presente nota contribui para o esclarecimento de pontos básicos ligados ao comportamento da água no sistema-solo-planta-atmosfera, principalmente para os usuários de psicrômetros de solo e de planta.
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Potencial da água; Energia livre de Gibbs; Psicrometria.
Ano: 1996
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161996000100029

Reguladores vegetais e o desbaste químico de frutos de tangor murcote
Provedor de dados: 63
Autores: Domingues,Marcio Christian Serpa; Ono,Elizabeth Orika; Rodrigues,João Domingos.
O tangor 'Murcote' apresenta necessidade de desbaste de frutos devido a alternância de produção, caracterizado por anos de excessiva produção intercalado com anos de baixa produção, evitando assim, a diminuição da qualidade dos frutos. O presente trabalho teve por objetivo avaliar a eficiência de reguladores vegetais, a auxina ANA (ácido naftalenacético) e ethephon (etileno) no desbaste químico de frutos de tangor 'Murcote' aplicado 40 dias após o pleno florescimento. O experimento foi conduzido em Pratânia, SP, onde plantas de 5 anos de idade, enxertadas sobre o limoeiro 'Cravo', foram pulverizadas com ANA a 0, 100, 200, 300 e 400 mg L-1 e com ethephon a 200, 300 e 400 mg L-1, ambos em solução aquosa juntamente com adjuvante não iônico a 0,05%. A contagem...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Citrus reticulata; Raleio; Ethephon; Ácido naftaleno acético.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000300008

Diagnostic fingerprints ISSR/SSR for tropical leguminous species Stylosanthes capitata and Stylosanthes macrocephala
Provedor de dados: 63
Autores: Alzate-Marin,Ana Lilia; Costa-Silva,Carolina; Rivas,Priscila Marlys Sá; Bonifacio-Anacleto,Fernando; Santos,Leticia Gobett; Moraes Filho,Rômulo Maciel de; Martinez,Carlos Alberto.
ABSTRACT: Stylosanthes capitata Vogel and Stylosanthes macrocephala M.B.Ferreira &amp; Sousa Costa are two forage leguminous species of agronomic importance for animal husbandry in tropical environments. The physical mixture of both species (80 % S. capitata and 20 % S. macrocephala) comprises the commercial cultivar &amp;#8220;Estilosantes Campo Grande”. However, proximity of fields for seed production may contaminate seed lots, compromising seeds quality. The combined use of dominant and co-dominant molecular markers is an appropriate strategy to certificate genetic purity and perform diversity studies of cultivars. In this research, a set of ISSR (Inter-Simple Sequence Repeat polymorphic DNA) and SSR (Simple Sequence Repeat polymorphic DNA) molecular...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Genetic purity; Genetic diversity; Seed production.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000301101

Ação do Agrostemin sobre a altura e o número de folhas de plantas de soja (Glycine max L. MERRILL cv. IAC-8)
Provedor de dados: 63
Autores: Fernandes,A.A.H.; Rodrigues,J.D.; Rodrigues,S.D.
O presente estudo teve por finalidade avaliar o efeito de um estimulante vegetal, o Agrostemin, sobre a altura e o número de folhas das plantas de soja (Glycine max L. MERRILL cv. IAC-8). O experimento foi conduzido em casa de vegetação. Foram estudados seis tratamentos, correspondentes as seguintes dosagens, épocas e formas de aplicação: testemunha (T1); 0,125g Agrostemin/l00g sementes (T2); 0,125g Agrostemin/100g semente e pulverização foliar à 333 ppm (T3); 0,125g Agrostemin/l00g sementes e pulverização foliar à 500 ppm (T4); pulverização foliar à 333 ppm (T5) e pulverização foliar à 500 ppm (T6). Realizaram-se três coletas de plantas, com intervalo de 14 dias. O experimento foi em delineamento inteiramente casualizado, utilizando-se duas análises de...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycine max L.; Agrostemin; Estimulante vegetal.
Ano: 1993
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161993000100002

Processing Eucalyptus cloeziana seed lots to improve purity, germination and vigor
Provedor de dados: 63
Autores: Michelon,Thomas Bruno; Vieira,Elisa Serra Negra; Panobianco,Maristela.
ABSTRACT Eucalyptus cloeziana is one of the highest-density wood species offering significant added value, frequently used in the construction and furniture industries. Despite its suitability, it may be overlooked on account of its propagation difficulties due either to its low rooting cutting capacity or to its seeds having a low germination rate perhaps attributable to the high proportion of indistinguishable impurities within the seed lots. This study aimed to develop an efficient technique for Eucalyptus cloeziana seed processing to increase the physical purity and, consequently, the physiological quality of the seed lot. Three seed lots, separated by size in sieves with 1.18, 1.00, and 0.84 mm square openings, were used. X-ray analyses were carried...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Eucalypt; Physical purity; Emergence; Seedlings.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000401601

Evaluation of natural preservatives in combination with acid whey for use in fermented sausage
Provedor de dados: 63
Autores: Wójciak,Karolina Maria; Dolatowski,Zbigniew Józef.
ABSTRACT Natural antioxidant and antimicrobial systems are set to become an important component in food preservation methodology. The effect of alternative natural preservatives (Sinapis alba L.-M, Rosmarinus officinalis L.-R, Juniperus communis L.-J) in combination with acid whey (AW) was investigated after the ripening period (21d) and over a prolonged storage period of sausage. An antioxidant activity of extracts exercise was performed. The antimicrobial, oxidative stability and sensory properties of these natural preservatives were compared to curing-control (C). Significantly lower rancid odor and rancid flavor (1.48) were observed for R and M compared with the C sample. The low level of these attributes evidenced the antioxidant properties of the R...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Storage in vacuum; Juniper; Mustard; Rosemary.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000200125

ANELAMENTO E ÁCIDO GIBERÉLICO NA FRUTIFICAÇÃO DA UVA 'MARIA' SEM SEMENTES
Provedor de dados: 63
Autores: Kalil,Geovanita Paulino da Costa; Terra,Maurilo Monteiro; Kalil Filho,Antonio Nascimento; Macedo,Jefferson Luiz Vasconcello de; Pires,Erasmo José Paioli.
Este trabalho foi desenvolvido com o objetivo de avaliar a resposta do cultivar Maria (IAC 514-6) ao anelamento e à aplicação de ácido giberélico na concentração de 200ppm, no início ou após o florescimento, para as características dos cachos, bagos e engaços. O experimento foi realizado em Jundiaí, SP, e o delineamento estatístico foi inteiramente casualizado, com doze tratamentos e cinco repetições. Não foram detectados efeitos de época de anelamento ou de aplicação de ácido giberélico. Efeitos significativos do anelamento no tronco ou nos ramos e da aplicação do ácido giberélico ou de ambos os tratamentos foram detectados para as características estudadas. Os incrementos verificados para essas características foram semelhantes ao serem aplicados os...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Videira cv. Maria; Anelamento; Ácido giberélico.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000200010

EFEITOS DE GIBERELINAS, CITOCININAS E DO NITRATO DE POTÁSSIO, NO PROCESSO GERMINATIVO DE SEMENTES DE LIMOEIRO `CRAVO' (Citrus limonia OSBECK)
Provedor de dados: 63
Autores: Leonel,Sarita; Rodrigues,João Domingos.
Foram estudados os efeitos de reguladores vegetais do grupo das giberelinas e citocininas, bem como do nitrato de potássio na germinação de sementes do limoeiro `Cravo' (Citrus limonia Osbeck). O experimento foi realizado, contendo papel de filtro como substrato para a germinação das sementes, regulado à temperatura de 25oC. As sementes foram retiradas de frutos maduros no final da safra do limoeiro `Cravo', lavadas, secas à sombra e armazenadas durante 11 dias em câmara fria. Em seguida, receberam tratamento com os fitorreguladores e KNO3 por 24 horas, de acordo com os tratamentos: KNO3 0,1% e 0,2%; GA3 50, 100 e 250 mg.L-1; GA4 + GA7 + fenilmetilaminopurina 100 mg.L-1; fenilmetilaminopurina 20 mg.L-1 e água destilada (testemunha). As avaliações foram...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Citrus limonia; Reguladores vegetais; Nitrato de potássio.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000100017

Variação e associação de características ligadas a formação do grão de genótipos de trigo
Provedor de dados: 63
Autores: Nedel,Jorge Luiz; Molas González,Cirilo Nelson Enrique; Peske,Silmar Teichert.
O rendimento de trigo (Triticum aestivum L.) é estabelecido pelo número de grãos produzidos por unidade de área e pelo peso do grão. Este é determinado pela taxa e duração do desenvolvimento do grão. A taxa e a duração do enchimento do grão foram determinados em sete genótipos de trigos brasileiros, com o objetivo de avaliar a variação genotípica para estes caracteres e a relação dos mesmos com parâmetros agronômicos. Variações genotípicas significativas foram observadas, tanto para a taxa como para a duração de enchimento da grão. A taxa e a duração de enchimento do grão variaram de 0,077 a 0,089 mg/sem/gráus dias acumulados e de 27 a 31 dias, respectivamente. A taxa e não a duração de enchimento estava associada ao peso do grão. A seleção de genótipos...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Triticum aestivum; Taxa de enchimento do grão; Peso do grão.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000500029

Differential leaf gas exchange performance of mango cultivars infected by different isolates of Ceratocystis fimbriata
Provedor de dados: 63
Autores: Bispo,Wilka Messner da Silva; Araujo,Leonardo; Moreira,Wiler Ribas; Silva,Leandro de Castro; Rodrigues,Fabrício Ávila.
ABSTRACT Caused by the vascular fungus Ceratocystis fimbriata, mango wilt is considered to be one of the most serious threats in mango-producing regions worldwide. However, changes in leaf gas exchange level and the mechanisms underlying host responses to this fungal infection remain poorly described. This study aimed to evaluate potential changes in the leaf gas exchange of different mango cultivars (Ubá, Espada, Haden and Tommy Atkins) in response to two Brazilian isolates of C. fimbriata (CEBS15 and MSAK16) to non-invasively assess cultivar variability in relation to the basal level of resistance to mango wilt. Both isolates, regardless of the cultivar, caused reductions in stomatal conductance and, thus, a reduction in CO2 assimilation via diffusive...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mangifera indica; Mango wilt; Photosynthesis; Vascular disease.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000200150

Nota do editor
Provedor de dados: 63
Autores: Reichardt,Klaus.
Tipo: Info:eu-repo/semantics/report
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000100001

Improving phosphorus availability from patos phosphate rock for Eucalyptus: a study with 32P radiotracer
Provedor de dados: 63
Autores: Villanueva,Felipe Carlos Alvarez; Muraoka,Takashi; Trevizam,Anderson Ricardo; Franzini,Vinicius Ide; Rocha,Alexandre Prado.
Eucalyptus plantation in Brazil is generally set on low fertility soils, therefore phosphorus (P) fertilization is mandatory and increases the cost of plantation operation. Using species that more efficiently uptake phosphorus from less soluble sources is an interesting option. However, little is known about eucalyptus regarding its ability of using less soluble forms of phosphorus. The use of P by eucalyptus (E. urophylla, E. grandis, and E. urophylla &lt;FONT FACE=Symbol&gt;´&lt;/FONT&gt; E. grandis) was studied in greenhouse using a loamy-textured, hipodystrophic Typic Haplustox from the Cerrado region, and 32P isotopic method. The P sources tested were triple superphosphate (TSP), phosphate rock (PR) and the triple superphosphate mixed with PR...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: L value; P sources; Radioisotope.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000100010

SENSIBILIDADE DE OVOS DE Ceratitis capitata (WIED., 1824) IRRADIADOS EM DIETA ARTIFICIAL E EM FRUTOS DE MANGA (Mangifera indica L.)
Provedor de dados: 63
Autores: RAGA,A; YASUOKA,S.T; AMORIM,E.O; SATO,M.E; SUPLICY FILHO,N; FARIA,J.T. de.
O objetivo deste trabalho foi determinar as doses de radiação gama que impedissem a emergência de adultos de Ceratitis capitata, a partir de ovos irradiados em dieta artificial e em frutos de manga. Quinhentos ovos de 6, 12, 24 e 48 horas de idade foram irradiados em cada dose. A infestação artificial de ovos ocorreu em mangas das cultivares Haden, Tommy Atkins ou Keitt. Um aumento da radioresistência de ovos foi observado durante o desenvolvimento embrionário, e para ovos de 48 horas em dieta artificial, foi estimado um Probit 9 de 24,67Gy. Não foi observada influência significativa dos frutos de manga na eficiência da irradiação dos ovos, quando comparada com os testes em dieta artificial.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Insecta; Mosca-do-mediterrâneo; Radiação gama; Tratamento quarentenário.
Ano: 1996
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161996000100016

Soybean yield estimation by an agrometeorological model in a GIS
Provedor de dados: 63
Autores: Berka,Luciana Miura Sugawara; Rudorff,Bernardo Friedrich Theodor; Shimabukuro,Yosio Edemir.
Agrometeorological models interfaced with the Geographic Information System - GIS are an alternative to simulate and quantify the effect of weather spatial and temporal variability on crop yield. The objective of this work was to adapt and interface an agrometeorological model with a GIS to estimate soybean [Glycine max (L.) Merr.] yield. Yield estimates were generated for 144 municipalities in the State of Paraná, Brazil, responsible for 90% of the soybean production in the State, from 1996/1997 to 2000/2001. The model uses agronomical parameters and meteorological data to calculate maximum yield which will be penalized under drought stress. Comparative analyses between the yield estimated by the model and that reported by the Paraná State Department of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Geographic information system; Municipalities; Weather; Crop.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000300003

Physical characteristics of extruded cassava starch
Provedor de dados: 63
Autores: Leonel,Magali; Freitas,Taila Santos de; Mischan,Martha Maria.
Considering the importance of cassava starch for Brazilian industries, the current work aimed at evaluating the effects of extrusion parameters on the physical characteristics, mainly viscosity properties of extruded cassava starch. A factorial central composite design (2³) with three independent variables and the response surface methodology were used to evaluate the results of expansion index, specific volume, water absorption index, water solubility index, color and paste properties, according to the variations in the moisture content, barrel temperature and screw speed. Results indicated that barrel temperature influenced the expansion index, specific volume, water absorption index, all the color parameters, the initial viscosity, peak and final...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Manihot esculenta; Modified starch; Extrusion; Viscosity.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000400009

Replacing the (inefficient) manual runoff sampling method used in Brazil – a prototype sample splitter
Provedor de dados: 63
Autores: Samuel-Rosa,Alessandro; Moura-Bueno,Jean Michel; Dalmolin,Ricardo Simão Diniz.
ABSTRACT The method used to sample the runoff collected from soil erosion plots can be a significant source of error. In this study, we performed a laboratory experiment to evaluate the efficiency of the runoff sampling method most commonly used in Brazil. It is based on the manual homogenization and sampling of the collected runoff. Using soil material with 583 g kg–1 of sand and 89 g kg–1 of clay, the manual sampling method was tested for its ability to produce representative samples of artificial suspensions with a concentration of 2, 10 and 50 g L–1 of total solids. An underestimation of 30 % or more of the concentration of total solids was observed, with a variation of the same magnitude (CV between 20 and 45 %). We then developed a prototype sample...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Erosion monitoring; Soil loss; Sandy soil; Uncertainty.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000401402

Genetic diversity analysis among pigeonpea genotypes adapted to South American regions based on microsatellite markers
Provedor de dados: 63
Autores: Sousa,Adna Cristina Barbosa de; Godoy,Rodolfo; Sforça,Danilo Augusto; Campos,Tatiana de; Zucchi,Maria Imaculada; Jank,Liana; Souza,Anete Pereira de.
The pigeonpea [Cajanus cajan (L) Millspaugh] is one of the most important perennial legume crops utilized in the food, fodder, soil conservation, crop-livestock integrated systems, reclaiming of degraded pastures and symbiotic nitrogen fixation. Microsatellite markers were used to estimate the genetic diversity of 77 pigeonpea genotypes selected from the germplasm collections at Embrapa Cattle-Southeast and, to evaluate their transferability to Phaseolus vulgaris and Vigna unguiculata species. The number of alleles per locus ranged from 2 to12, with an average of 5.1 alleles. The PIC values ranged from 0.11 to 0.80 (average 0.49) and the D values from 0.23 to 0.91 (average 0.58). The averages of observed and expected heterozygosity were 0.25 and 0.47,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Legumes; Transferability; Microsatellite; Germplasm.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000400007

Chemical composition and decomposition rate of plants used as green manure
Provedor de dados: 63
Autores: Silva,Gabriela Tavares Arantes; Matos,Laudiceio Viana; Nóbrega,Pedro de Oliveira; Carneiro,Eduardo Francia; Resende,Alexander Silva de.
Productive systems in which green manure is the source of nutrients must develop more efficient ways to improve soil nutrient dynamics. A well-synchronized balance must be established between specific crop demands and supply of nutrients from decomposition. However, scientific data and information to help improve green manure management in Brazil is still insufficient. For that reason, a number of arboreal species was first chemically characterized and then subjected to decomposition analysis in order to establish a correlation between some parameters. Species were grouped together based on the similarity of chemical composition and decomposition rate. The lignin:N and (lignin+polyphenol):N ratios were found to have the greatest correlation coefficient...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nutrient recycling; Half life time; Agroforest system.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000300010

Flutuação das proteínas séricas em vacas primíparas e multíparas no período pré-parto
Provedor de dados: 63
Autores: Machado Neto,R.; Prado,G.V.B.; Bessi,R.; Hattnher,F.L.
O comportamento das proteínas séricas foi avaliado em dois grupos de vacas de leite, 6 primíparas e 6 multíparas, durante as ultimas 6 semanas pré-parto. Para separação da fração protéica foi empregado o método de eletroforese, enquanto para quantificação da proteína total foi utilizado o método de biureto. O sangue, retirado da região coccígea, foi amostrado nos períodos 5, 4, 3, 2, 1 semanas pré-parto e no dia do parto. Os resultados indicam uma queda na concentração da proteína total (p &lt; 0.0001), em função do decréscimo da concentração de imunoglobulina (p &lt; 0.0001), durante o período analisado. A proteína total decresceu de 9,82 + 0,7 g/100 ml, na quinta semana pré-parto, para 7,92 + 0,6 g/100 ml no dia do parto (valor mínimo médio registrado)....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Imunidade passiva; Colostro; Vaca.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000100026

Response of a clingstone peach cultivar to regulated deficit irrigation
Provedor de dados: 63
Autores: Sotiropoulos,Thomas; Kalfountzos,Dimitrios; Aleksiou,Ioannis; Kotsopoulos,Spyros; Koutinas,Nikolaos.
Regulated deficit irrigation (RDI) involves inducing water stress during specific fruit growth phases by irrigating at less than full evapotranspiration. The objectives of this research were to study the effects of RDI perfomed at stage II of fruit growth and postharvest, on productivity of clingstone peaches, fruit quality as well as photosynthetic rate and midday leaf water potential. The research was conducted in a commercial clingstone peach (Prunus persica L. Batch cv. A-37) orchard in Greece. Trees were irrigated by means of microsprinklers and their frequency was determined using local meteorological station data and the FAO 56 Pennman-Monteith method. Photosynthetic rate was measured by a portable infrared gas analyzer. Midday leaf water potential...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fruit drop; Leaf water potential; Photosynthetic rate; Water savings.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000200006

Greenhouse tomato production with electricity generation by roof-mounted flexible solar panels
Provedor de dados: 63
Autores: Ureña-Sánchez,Raúl; Callejón-Ferre,Ángel Jesús; Pérez-Alonso,José; Carreño-Ortega,Ángel.
The integration of renewable energy sources into greenhouse crop production in southeastern Spain could provide extra income for growers. Wind energy could be captured by small to medium-sized wind turbines, gas could be produced from biomass, and solar energy could be gathered by solar panels. The aim of this study was to examine the effect of flexible solar panels, mounted on top of a greenhouse for electricity production, on yield and fruit quality of tomatoes (Solanum lycopersycum L., cv Daniela). This study was undertaken in a commercial raspa y amagado greenhouse, typical of the Almería region (Spain). Tomato plantlets were planted at a density of 0.75 plants m-2. The flexible solar panels were mounted on two parts of the roof in different...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Solanum lycopersycum L.; Shading; Total production; Renewable energy; Fruit quality.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162012000400001

Growth of citrus rootstocks under aluminium stress in hydroponics
Provedor de dados: 63
Autores: Pereira,Walter Esfrain; Siqueira,Dalmo Lopes de; Puiatti,Mario; Martínez,Carlos Alberto; Salomão,Luiz Carlos Chamhum; Cecon,Paulo Roberto.
Plants present different degrees of adaptation to aluminium (Al) concentrations in the soil, and the understanding of this characteristic can lead to a viable option for the utilization of acid soils. The objective of this experiment was to evaluate the effects of five Al concentrations (0, 50, 100, 200, and 400 mumol L-1) on the growth of 'Rangpur' lime (Citrus limonia Osbeck) and 'Volkamer' lemon (Citrus volkameriana Hort. ex Tan.), and tangerine rootstocks 'Cleópatra' (Citrus reshni Hort. ex Tan) and 'Sunki' (Citrus sunki Hort. ex Tan.), in hydroponic culture. The treatments were arranged in a randomized block design, with four replications. For all rootstocks, the relative growth rate in terms of plant total fresh matter increased under low and,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Citrus sp.; Relative growth rate; Principal components; Nutrient solution.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000100006

Formas de adição de zinco a um formulado NPK e seu efeito sobre a produção de milho
Provedor de dados: 63
Autores: Korndörfer,G.H.; Alcantara,C.B.; Horowitz,N.; Lana,R.M.Q.
O presente trabalho teve como objetivo avaliar os efeitos de fontes, doses e formas de adição de zinco a um formulado NPK sobre a produção de grãos e matéria seca de milho em um solo de cerrado da região de Uberlândia, MG. Quatro doses de zinco foram aplicadas ao solo (0, 1, 2 e 4 kg de Zn ha-1), através de três formas (ZnO-incorporado, FTE BR-12-incorporado e FTE BR-12-gramilado) adicionadas a um formulado NPK (4-30-10). O ZnO e as Fritas em pó foram incorporados ao formulado durante a fabricação, antes da granulação. Um tratamento adicional de FTE previamente granulado e depois misturado ao formulado, também foi testado. Os resultados mostraram que o zinco agregado ao adubo NPK não teve efeito sobre a produção de grãos de milho, nem tampouco sobre a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Milho; Óxido de zinco; FTE; Zinco; Granulação.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000300024

Spectral indices for the detection of salinity effects in melon plants
Provedor de dados: 63
Autores: Hernández,Encarni I.; Melendez-Pastor,Ignacio; Navarro-Pedreño,Jose; Gómez,Ignacio.
Water scarcity and soil salinization affect large semiarid agricultural areas throughout the world. The maintenance of agricultural productivity implies better agricultural practices and a careful selection of resistant crops. A proper monitoring of the physiological status of plants can lead to better knowledge of plant nutritional requirements. Visible and near-infrared (VNIR) radiometry provides a non-destructive and quantitative method to monitor vegetation status by quantifying chemical properties using spectroscopic techniques. In this study, the capability of VNIR spectral measurements to detect salinity effects on melon (Cucumis melo L.) plants was tested. Melon plants were cultivated under multiple soil salinity conditions (electrical...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: VNIR radiometry; Cucumis melo L.; Saline soil.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162014000400010

Yield and quality of primocane-fruiting raspberry grown under plastic cover in southern Brazil
Provedor de dados: 63
Autores: Marchi,Priscila Monalisa; Carvalho,Ivan Ricardo; Pereira,Ivan dos Santos; Rosa,Tiago Corazza da; Höhn,Daniela; Szareski,Vinícius Jardel; Reisser Júnior,Carlos; Antunes,Luis Eduardo Corrêa.
ABSTRACT: Raspberry (Rubus idaeus L.) is an economically important crop and its cultivation has been expanded across temperate and subtropical regions of Brazil. Growing raspberries under plastic cover has becoming more common worldwide. This study investigated the effect of plastic cover on productive and morphological performance of primocane-fruiting raspberry cultivars, in southern Brazil. The experiment was arranged in a 3 × 2 × 2 factorial design, with three raspberry cultivars, ‘Heritage’; ‘Fallgold’ and ‘Alemãzinha’; two cultivation systems, presence and absence of plastic cover; and two production cycles, fall and spring. We measured days from transplanting to flowering and harvesting. Plants were evaluated for dry mass of pruning, plant height,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Rubus idaeus L.; Production; Protected crop; Small fruits; Berries.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162019001600481

Identification of duplicates in cassava germplasm banks based on single-nucleotide polymorphisms (SNPs)
Provedor de dados: 63
Autores: Albuquerque,Hilçana Ylka Gonçalves de; Oliveira,Eder Jorge de; Brito,Ana Carla; Andrade,Luciano Rogério Braatz de; Carmo,Cátia Dias do; Morgante,Carolina Vianna; Vieira,Eduardo Alano; Moura,Elisa Ferreira; Faleiro,Fábio Gelape.
ABSTRACT: Genetic redundancy in cassava (Manihot esculenta Crantz) presents a challenge to efficient management of genetic resources. This study aimed to identify and define the genetic structure of duplicates in cassava germplasm from various Embrapa research units, using single-nucleotide polymorphism (SNP) markers. We evaluated 2,371 accessions with 20,712 SNPs. The identification of duplicates was performed based on multilocus genotypes (MLG), adopting a maximum genetic distance threshold of 0.05. The population structure was defined based on discriminant analysis of principal components (DAPC). A total of 1,757 unique and 614 duplicate accessions were identified. The redundancy of the collections ranged from 17 % (Belém, PA – Brazil) to 39 %...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Manihot esculenta Crantz; Genotyping-by-sequencing; Multilocus; Genetic resources.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162019001400328

Efeito do boro sobre os teores de proteína e atividade da peroxidade em calos de cana-de-açúcar (Saccharum spp. var NA56-79) in vitro
Provedor de dados: 63
Autores: Fumis,T.F.; Brasil,O.G.
Calos de cana-de-açúcar variedade NA56-79, foram desenvolvidos em meio de cultura contendo sais minerais acrescidos de hormônios e vitaminas. Após a obtenção de quantidade suficiente de material, foram submetidos a três níveis diferentes de boro (omisso, 6,2 mg/L, 12,4mg/L). Foram analisados o teor protéico e a atividade da peroxidase. Os resultados mostraram que, em relação ao teor protéico, este foi menor na deficiência e maior em níveis mais elevados de boro. A variação da atividade da peroxidase mostrou um resultado inverso ao da proteína.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cultura de tecidos; Saccharum spp.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000100027

Choice of tracers for the evaluation of spray deposits
Provedor de dados: 63
Autores: Palladini,Luiz Antonio; Raetano,Carlos Gilberto; Velini,Edivaldo Domingues.
Tracer substances, used to evaluate spraying effectiveness, ordinarily modify the surface tension of aqueous solutions. This study aimed to establish a method of using tracers to evaluate distribution and amount of spray deposits, adjusted to the surface tension of the spraying solution. The following products were tested: 0.15% Brilliant Blue, 0.15% Saturn Yellow in 0.015% Vixilperse lignosulfonate, and 0.005% sodium fluorescein, and mixtures of Brilliant Blue plus Saturn Yellow and Brilliant Blue plus sodium fluorescein at the same concentrations. Solutions were deposited on citrus leaves and stability was determined by measuring fluorescence and optical density of solutions without drying, dried in the dark and exposed to sunlight for 2, 4 and 8 h....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pesticide application; Deposition assessment; Tracer; Citrus trees.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000500005

Scarification with sulphuric acid of Schizolobium amazonicum Huber ex Ducke seeds - FABACEAE
Provedor de dados: 63
Autores: Cruz,Eniel David; Carvalho,José Edmar Urano de; Queiroz,Rafaela Josemara Barbosa.
Seed coat impermeability to water occurs in many species, including Schizolobium amazonicum Huber ex Ducke. To promote germination in seeds with coat impermeability the use of sulphuric acid (H2SO4) is recommended. The objective of this study was to identify a better time for the scarification with sulphuric acid for S. amazonicum seeds. The effect of scarification with sulphuric acid for 20, 40 and 60 min on germination and speed germination was studied for seeds that were either sowed immediately after scarification or after a 24-hour period of immersion in water. Seeds were sown on a mix of sand and sawdust (1:1). The experimental design was completely randomized with four replications of 50 seeds. The statistical analysis of germination was carried out...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Tropical species; Amazonian region; Hard seed; Seeds coat impermeability; Physical dormancy.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000300017

Reaction of sweet pepper to the potato virus y (PVYm)
Provedor de dados: 63
Autores: Echer,Márcia de Moraes; Costa,Cyro Paulino da.
Traditional sweet pepper cultivars showing susceptibility to the Potato virus Y (PVY) are being replaced by resistant hybrids with higher commercial value. Despite of much information about resistance source reaction and their inheritance, there is no knowledge about the genetic background of commercial resistant hybrids. Reaction of sweet pepper (Capsicum annuum L.) hybrids to the Potato virus Y (PVYm) such as Acuario, Magali R, Nathalie and their respective generations F2 and F3 as well as hybrids Amanda, Corteso W208, CPC-6272, Dagmar, Elisa, Magali, Margarita, Monteiro, Quantum, Vivo W205 was evaluated. Reaction to PVYm was evaluated as resistant or susceptible. Magali R and Nathalie hybrid did not show any mosaic symptoms. Magali R and Nathalie...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Capsicum annuum; Resistance; Potyvirus.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000200016

Ruminal degradability of hard or soft texture corn grain at three maturity stages
Provedor de dados: 63
Autores: Pereira,Marcos Neves; Von Pinho,Renzo Garcia; Bruno,Ralph Guilherme da Silva; Calestine,Gabriela Arruda.
The predominance of vitreous endosperm in hard texture flint corn (Zea mays L.) can decrease ruminal starch digestion comparatively to the farinaceous endosperm of dent corn, reducing energy content of the grain. The objective of this experiment was to evaluate the effects of texture and maturity stage on ruminal degradability of corn grain. Two dent and two flint hybrids were harvested at the early dent, half milk line, and black layer stages. The proportion of vitreous endosperm (vitreousness) in dent hybrids was 44.3%, while in flint it was 67.0%. There was a linear increase in vitreousness with advancing maturity. Flint hybrids at the early dent stage were more vitreous than dent at the black layer stage. The increase in vitreousness per maturation day...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vitreousness; Endosperm; Dent corn; Flint corn; Rumen.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000400002

Solubilisation of inorganic phosphates by inoculant strains from tropical legumes
Provedor de dados: 63
Autores: Marra,Leandro Marciano; Oliveira,Silvia Maria de; Soares,Cláudio Roberto Fonsêca Sousa; Moreira,Fatima Maria de Souza.
Microbial solubilisation of low soluble inorganic phosphates is an important process contributing for the phosphorus available to plants in tropical soils. This study evaluates the ability of inoculant strains for tropical legumes to solubilise inorganic phosphates of low solubility that are found in tropical soils. Seven strains of Leguminosae nodulating bacteria (LNB) were compared with one another and with a non-nodulating positive control, Burkholderia cepacia (LMG 1222T). Four of the strains are used as inoculants for cowpeas (Vigna unguiculata) (Bradyrhizobium sp. UFLA 03-84; Bradyrhizobium elkani INPA 03-11B and Bradyrhizobium japonicum BR3267) or for common beans (Phaseolus vulgaris) (Rhizobium tropici CIAT 899T). Rhizobium etli UFLA 02-100 and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Rhizobium; Bradyrhizobium; Cupriavidus; Phosphate-solubilising bacteria; Nitrogen-fixing bacteria.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000500015

Erratum
Provedor de dados: 63
Tipo: Info:eu-repo/semantics/other
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000500017

EFEITO DO BENEFICIAMENTO DE SEMENTES DE TREMOÇO  AZUL SOBRE SUAS QUALIDADES FÍSICA, FISIOLÓGICA E SANITÁRIA
Provedor de dados: 63
Autores: AHRENS,; KRZYZANOWSKI,F.C.
As escassas informações, referentes ao beneficiamento de sementes de Lupinus angustifolius (L.), motivaram a avaliação dos efeitos da ação dos equipamentos sobre as qualidades física, fisiológica e sanitária do lote de sementes processado. O estudo, realizado com sementes de tremoço azul cv. IAPAR 24, considerou tratamentos obtidos no processamento, isolado e conjunto, em máquina de ventilador e peneiras e mesa de gravidade. Foram avaliados os rendimentos das máquinas e as qualidades sanitária, física e fisiológica das sementes processadas. Concluiu-se que, o uso da mesa gravitacional, associado ou não ao da máquina de ventilador e peneiras, proporciona ganhos qualitativos às sementes de tremoço.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lupinus angustifolius (L.); Beneficiamento; Germinação; Vigor; Aspergillus spp; Tremoço.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000200012

Wood-associated fungi produce volatile organic compounds toxic to root-knot nematode
Provedor de dados: 63
Autores: Pimenta,Lívia; Ferreira,Maria Alves; Pedroso,Marcio Pozzobon; Campos,Vicente Paulo.
ABSTRACT Since volatiles do not leave residues in food and cause low toxicity to humans, they can act as a skeleton for new nematicidal molecules, once they have demonstrated activity against phytonematodes. The aim of this study was to evaluate the effect of volatile organic compounds (VOCs) released by wood-associated fungi on controling second-stage juveniles (J2) of Meloidogyne incognita. All 28 wood-associated fungi isolates produced VOCs which caused in excess of 76 % immobility in exposed J2 of M. incognita. The fungus isolate VOCs also caused significant mortality compared to control when J2 were exposed to them. After 6 h of exposure, the fungus species Epicoccum nigrum and Schizophyllum commune produced VOCs that immobilized exposed J2 compounds,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Epicoccum nigrum; Schizophyllum commune; Root nematodes; Chromatography; Control.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162017000400303

ACÚMULO DE CÁDMIO POR Saccharomyces cerevisiae  FERMENTANDO MOSTO DE MELAÇO
Provedor de dados: 63
Autores: PRADO-FILHO,L.G. do; DOMINGOS,R.N.; SILVA,S.M.G. da.
O presente trabalho visou o estudo do acúmulo de cádmio (Cd) por Saccharomyces cerevisiae, fermentando mosto de melaço com contaminações controladas em níveis sub-tóxicos do citado metal. As condições de fermentação foram similares às reinantes na produção industrial de etanol. O mosto, não esterilizado, continha 12% de açúcares redutores totais (ART) e pH 4,5. Para a contaminação controlada empregou-se dois sais de cádmio, cloreto e acetato e, quatro níveis de contaminação 0,5; 1,0; 2,0 e 5,0 mg Cd.kg-1 mosto. A inoculação do mosto foi executada com fermento de panificação (10% p/p). Após a fermentação (4 horas) foram determinados, porcentagem de fermento no vinho centrifugado e teor alcoólico. Na levedura separada foram determinados peso úmido, matéria...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Saccharomyces cerevisiae; Melaço; Metal pesado; Cádmio; Espectrofotômetria de absorção atômica.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000100020

Seleção de caramboleiras pelas características biométricas e físico-químicas dos frutos
Provedor de dados: 63
Autores: Araújo,Paulo Sérgio Rodrigues de; Minami,Keigo.
Caracterizaram-se caramboleiras relacionando as características biométricas e físico-químicas dos frutos. Foram utilizadas 15 caramboleiras de pomar comercial, em Mirandópolis-SP. Procederam-se seis coletas de 50 frutos por planta, no período entre 1997 e 1999, para avaliações biométricas de comprimento, diâmetro, massa, número de gomos e sementes. Nas referidas coletas para avaliação dos parâmetros físico-químicos, utilizaram-se três frutos por planta, sendo analisados: sólidos solúveis totais (SST), acidez total titulável (ATT), "ratio", firmeza de polpa, pH e coloração externa. Duas plantas foram superiores às demais em relação ao comprimento e massa dos frutos, apresentando elevados teores de SST e "ratio", entretanto, baixa ATT, características...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Averrhoa carambola.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000100015

Resistance inducing agents on the biology and probing behaviour of the greenbug in wheat
Provedor de dados: 63
Autores: Pereira,Rosane Rodrigues Costa; Moraes,Jair Campos; Prado,Ernesto; Dacosta,Ronelza Rodrigues.
The greenbug Schizaphis graminum (Rond.) (Hemiptera: Aphididae) is one of the main pestinsects of wheat (Triticum aestivum, L.). Resistance inducing agents as silicon (Si) and acibenzolar-s-methyl (ASM) can provide some protection against insects and diseases. The effect of Si and/or ASM on the development and probing behaviour of S. graminum in wheat plants was evaluated. Wheat plants (cultivar Embrapa 22) were treated with Si (silicic acid at the rate of 1%) and acibenzolar-S-methyl (ASM) at the rate of 0.5%. The effects of these treatments on greenbugs were analyzed by development parameters, honeydew excretion and probing behavior monitored by Electrical Penetration Graphs (EPG). The development and honeydew experiments consisted of ten replications...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: S. graminum; EPG; ASM; Silicon; Induced resistance.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000400009

EXACT EQUATIONS FOR SOIL PARTICLE-SIZE ANALYSIS BY GAMMA-RAY ATTENUATION
Provedor de dados: 63
Autores: Elias,Elimoel Abraão; Bacchi,Osny Oliveira Santos; Reichardt,Klaus.
Soil particle-size analysis by gamma-ray attenuation was first suggested in 1992 and improved in 1997 by diminishing the measurement time and adapting it for automation. It is here demonstrated that when the mass attenuation coefficient &lt;FONT FACE="Symbol"&gt;m&lt;/font&gt;w and the density Dw are replaced by &lt;FONT FACE="Symbol"&gt;m&lt;/font&gt;s and Ds (where the subscripts w and s stand for water and solution) in the approximate equations used to estimate the concentration of suspended particles, they become exact. The demonstration is based by treating the dispersant and water solution as one single medium, instead of treating them as two media. In this way, six variables are reduced to only three. Physical considerations suggest that the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Granulometry; Soil mechanical analysis; Soil texture; Gamma attenuation.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000100014

EFEITOS DA SATURAÇÃO POR BASES, RELAÇÕES  Ca:Mg NO SOLO E NÍVEIS DE FÓSFORO SOBRE A  PRODUÇÃO DE MATERIAL SECO E NUTRIÇÃO  MINERAL DO MILHO (Zea mays L.)
Provedor de dados: 63
Autores: MUNOZ HERNANDEZ,R.J.; SILVEIRA,R.I.
Visando avaliar o efeito da saturação por bases, da relação Ca:Mg e de doses de fósforo sobre a nutrição mineral e produção de material seco de milho (Zea mays, L.) foi realizado experimento em casa de vegetação, utilizando o solo classificado como Areia Quartzosa que foi coletado na camada de 0-20 cm. O ensaio foi conduzido em vasos de 3 dm3, sob fatorial 2*4*3 inteiramente casualizado, com 4 repetições, sendo 2 saturações por bases (50 e 70%), 4 relações Ca:Mg no solo (2:1, 3:1, 4:1 e 5:1), obtidas pela aplicação de CaCO3 e MgO, e 3 doses de P (0, 100 e 200 mg dm-3) pela aplicação de fosfato monoamônico (MAP). Os resultados obtidos demonstraram que o aumento na saturação por bases influenciou positivamente o crescimento e a nutrição do milho. Houve...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fósforo; Milho; Nutrição; Relação Ca:Mg; Saturação por bases.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000100014

15N-labeled glyphosate synthesis and its practical effectiveness
Provedor de dados: 63
Autores: Tavares,Claudinéia Raquel de Oliveira; Bendassolli,José Albertino; Ribeiro,Daniela Neves; Rossete,Alexssandra Luiza Rodrigues Molina.
Glyphosate is the herbicide with the greatest participation in the world market, and it has been used intensively in agriculture for over 30 years, especially because of its relatively low cost and high effectiveness on different species. This study describes a synthesis method of glyphosate in the form of the isopropylamine salt enriched in the stable nitrogen isotope (15N). The 15N-herbicide synthesis was performed using a phosphomethylation reaction with dialkyl phosphite and 15N-glycine. The tests were conducted at a microscale and equimolar quantities. A 20% yield was obtained at the established conditions. To test the effectiveness of the synthesized glyphosate, an experiment was performed in a growth chamber with the weed Lolium multiflorum...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Lolium multiflorum; Isopropylamine salt; Stable isotope.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000100014

Calogênese, embriogênese somática e isolamento de protoplastos em variedades de laranja doce
Provedor de dados: 63
Autores: Benedito,Vagner Augusto; Mourão Filho,Francisco de Assis Alves; Mendes,Beatriz Madalena Januzzi.
Com o objetivo de produzir calos embriogênicos de citros, óvulos abortados de frutos maduros de 6 variedades de laranja doce (Citrus sinensis L. Osbeck), ‘Bahia Cabula’, ‘Baianinha’, ‘Hamlin’, ‘Orvalho de Mel’, ‘Rubi’ e ‘Valência’ foram introduzidos em meio de cultivo MT modificado com adição de extrato de malte, com e sem adição de 5 mg L-1 benziladenina (BA). Os calos obtidos das variedades ‘Bahia Cabula’, ‘Orvalho de Mel’, ‘Rubi’ e ‘Valência’ foram cultivados em meio basal MT, contendo os carboidratos maltose, galactose, lactose, glicose ou sacarose nas concentrações de 18; 37; 75; 110 e 150 mM para a indução da embriogênese somática. Os calos destas mesmas variedades foram submetidos ao isolamento de protoplastos, com o uso de 3 soluções enzimáticas....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Citrus sinensis; Cultura de tecido.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000100007

Artificial neural network for prediction of the area under the disease progress curve of tomato late blight
Provedor de dados: 63
Autores: Alves,Daniel Pedrosa; Tomaz,Rafael Simões; Laurindo,Bruno Soares; Laurindo,Renata Dias Freitas; Silva,Fabyano Fonseca e; Cruz,Cosme Damião; Nick,Carlos; Silva,Derly José Henriques da.
ABSTRACT: Artificial neural networks (ANN) are computational models inspired by the neural systems of living beings capable of learning from examples and using them to solve problems such as non-linear prediction, and pattern recognition, in addition to several other applications. In this study, ANN were used to predict the value of the area under the disease progress curve (AUDPC) for the tomato late blight pathosystem. The AUDPC is widely used by epidemiologic studies of polycyclic diseases, especially those regarding quantitative resistance of genotypes. However, a series of six evaluations over time is necessary to obtain the final area value for this pathosystem. This study aimed to investigate the utilization of ANN to construct an AUDPC in the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phytophthora infestans; ANN; AUDPC; Artificial intelligence; Plant breeding.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162017000100051

Decision-making on the optimum timing for nitrogen fertilization on sugarcane ratoon
Provedor de dados: 63
Autores: Castro,Sérgio Gustavo Quassi de; Rossi Neto,João; Kölln,Oriel Tiago; Borges,Bernardo Melo Montes Nogueira; Franco,Henrique Coutinho Junqueira.
ABSTRACT: Low efficiency of nitrogen from fertilizers is a major concern worldwide, threatening the sustainability of sugarcane production. The N use efficiency (NUE) by sugarcane can be improved by adopting better fertilizing management practices, reducing environmental impacts. This work evaluated the effects of varying N rates and time of application on stalks and sugar yield in ratoon harvested early in the crop season. The experimental design was a randomized block in a 2 × 4 factorial design and a control (no N) with five replications, including two application times (45 or 90 DAH – days after harvest) and four N rates (50, 100, 150, or 200 kg N ha−1). The time of N fertilizer application promoted differences in stalk yield, as the cumulative yield...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: N fertilization; Green cane; Sugarcane yield; Economical rate.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162019001300237

Preparo do solo, irrigação por aspersão e rendimento de engenho do arroz de terras altas
Provedor de dados: 63
Autores: Arf,Orivaldo; Rodrigues,Ricardo Antonio Ferreira; Sá,Marco Eustáquio de; Crusciol,Carlos Alexandre Costa; Pereira,Júlio Cesar dos Reis.
O rendimento de engenho obtido após o beneficiamento industrial é um parâmetro importante durante a fase de comercialização do arroz e pode ser influenciado pelas práticas culturais realizadas durante o período de cultivo. O presente trabalho teve como objetivo avaliar o rendimento de benefício, rendimento de inteiros e grãos quebrados de cultivares de arroz de sequeiro em função do preparo do solo e da irrigação por aspersão na região de Selvíria - MS, durante os anos agrícolas de 1997/98 e 1998/99. O solo do local é do tipo Latossolo Vermelho álico, textura argilosa e os tratamentos consistiram na combinação de três cultivares de arroz (IAC 201, Carajás e Guarani), com três sistemas de preparo do solo (arado de aiveca + grade niveladora, escarificador +...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lâminas de água; Grade pesada; Arado de aiveca; Escarificador; Cultivares.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000200018

Atrazine degradation patterns: the role of straw cover and herbicide application history
Provedor de dados: 63
Autores: Leal,Daniela Piaz Barbosa; Dick,Deborah Pinheiro; Stahl,Anna Meike; Köppchen,Stephan; Burauel,Peter.
ABSTRACT: In Brazil, atrazine (ATZ) is widely applied to maize (Zea mays L.) fields for weed control. The presence of ATZ and its metabolites in soil and water matrices has become a matter of some concern for governmental authorities as well as for society at large. This study evaluated the patterns of ATZ degradation (mineralization, extractable and non-extractable ATZ residues, and metabolite formation) in a Brazilian Typic Paleudult. Soil samples from a cultivated area under a no-tillage system with a history of ATZ application were incubated with 14C-ATZ in both the presence and absence of straw cover on the soil surface, and the evolved 14CO2 was determined by liquid scintillation. Samples from an area with native vegetation, adjacent to the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Atrazine mineralization; Sorption; Metabolites; No-tillage.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162019000100063

Avaliação dO DESEMPENHO de um Pivô Central de Grande Porte e Baixa Pressão
Provedor de dados: 63
Autores: FOLEGATTI,M.V.; PESSOA,P.C.S.; PAZ,V.P.S.
O sistema de irrigação Pivô Central tem proporcionado um significativo avanço da agricultura irrigada no Brasil. A grande aceitação do equipamento se deve às suas características, que permitem a irrigação mecanizada de extensas áreas, mesmo de topografia irregular, facilidade de utilização de práticas de quimigação, estrutura que não interfere nas operações agrícolas, e em relação ao manejo, possibilidade de aplicação de pequenas lâminas a intervalos reduzidos, além da grande vantagem de após completar um ciclo de irrigação, está no lugar exato para reiniciar outro ciclo. Este trabalho teve como objetivo determinar e analisar as características operacionais de um sistema pivô central de baixa pressão e de grande porte e vazão. Foram estudadas a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Irrigação; Uniformidade; Pivô central.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000100019

Estimates of heritability and genetic correlations for meat quality traits in broilers
Provedor de dados: 63
Autores: Gaya,Leila de Genova; Mourão,Gerson Barreto; Ferraz,José Bento Sterman; Mattos,Elisângela Chicaroni de; Costa,Andrezza Marcovig Moreira Alves da; Michelan Filho,Tércio; Rosa,Alessandra Fernandes; Felício,Andrezza Maria; Eler,Joanir Pereira.
Broiler meat quality is one of the primary factors considered by the poultry industry. This study was conducted to estimate heritability and genetic correlation coefficients for meat quality traits in a single male broiler line. The meat ultimate pH (24 h after slaughter) and lightness presented the highest heritability estimates. Given the estimated genetic correlations, the pH measured at 15 min and 24 h after slaughtering, as well as lightness, were characterized by a close and negative genetic relationship with water holding capacity traits. In contrast, meat quality traits exhibited only non-significant genetic correlations with performance and carcass traits. Noticed exceptions were breast weight, which was genetically and favorably associated with...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Animal breeding; Genetic parameters; Poultry.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000600002

Prunus hybrids rootstocks for flat peach
Provedor de dados: 63
Autores: Legua,Pilar; Pinochet,Jorge; Moreno,María Ángeles; Martínez,Juan José; Hernández,Francisca.
Peach (Prunus persica L.) is the most important stone fruit tree grown in Spain and is the second most important fruit crop in Europe. The influence of eight Prunus rootstocks (GF-677, Krymsk® 86, PADAC 97-36, PADAC 99-05, PADAC 9912-03, PADAC 0024-01, PAC 0021-01 and PAC 0022-01) on vigor, yield and fruit quality traits of 'UFO 3' flat peach cultivar was studied. The highest trunk cross sectional area was exhibited by GF-677 and the lowest by PADAC 99-05, while intermediate values were found on the other rootstocks. The highest yield efficiency was found on PADAC 99-05, PAC 0021-01, PAC 0022-01 and PADAC 0024-01 and the lowest was shown on Krymsk® 86. The fruit quality parameters measured were color, fruit and stone weights, equatorial diameter, pulp...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: SSC; Fruit weight; Rootstock; Acidity; Yield.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162012000100003

Upland rice: phenotypic diversity for drought tolerance
Provedor de dados: 63
Autores: Lanna,Anna Cristina; Coelho,Gesimária Ribeiro Costa; Moreira,Alécio Souza; Terra,Thiago Gledson Rios; Brondani,Claudio; Saraiva,Gabriel Rios; Lemos,Frederico da Silva; Guimarães,Paulo Henrique Ramos; Morais Júnior,Odilon Peixoto; Vianello,Rosana Pereira.
ABSTRACT: Upland rice is cultivated mostly in Latin America and Africa by small farmers and in areas with risk of dry spells. This study evaluated morphophysiological mechanisms of upland rice associated to drought adaptation. A set of 25 upland rice genotypes were grown in a plant phenotyping platform during 2015 and 2017 under regular irrigation and water restriction. We evaluated morphophysiological traits in shoots (vegetative structures growth, gas exchange, water use efficiency, carboxylation efficiency, water status) and roots (length, surface area, volume and diameter), as well as agronomic traits (grain yield and its components). There was a reduction in grain yield by up to 54 % and 58 % in 2015 and 2017, respectively, under water deficit. Five...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Grain yield; Gas exchange; Water status; Root system; Vegetative morphology.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000500603

Impact of local conditions and machine management on grape harvest quality
Provedor de dados: 63
Autores: Costa Neto,Wilson Valente da; Elorza,Pilar Barreiro; Garrido-Izard,Miguel.
ABSTRACT: Since its inception approximately 50 years ago, the grape harvester has been one of the machines responsible for the expansion of viticulture in the world. In Spain, harvesters were introduced in the 1990s (there are now approximately 3,000 machines there as of 2017), while they were introduced in Brazil in 2010. Harvest mechanization requires specific crop adaption and new work features that deserve to be analysed from their very beginnings. The aim of this study was to evaluate the management of four commercial grape harvest machines under actual field conditions on an intercontinental basis in two locations in Brazil and Spain. Machine performance measured by work (ha h−1) and processing capacity (kg h−1), together with field efficiency (%)...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Grape wine; Mechanization; Performance; Trellising system; Transcontinental approach.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162019001500353

Inbreeding depression in maize populations of reduced size
Provedor de dados: 63
Autores: Maldonado,Félix Alonso Astete; Miranda Filho,José Branco de.
Inbreeding is a well known phenomenon in living beings and its immediate consequence is the decrease in the expression of quantitative traits, known as inbreeding depression. Selfing is the most common system of inbreeding in plant species; however, little has been studied with other less severe inbreeding systems, such that resulting from small population sizes. The present work consisted of the study of the inbreeding effect on quantitative traits as a consequence of reduced population size under panmixy. Three maize (Zea mays L.) populations were used in this study: P1 -- ITA, population derived from the variety IAC-Taiúba; P2 -- represented by 30 subpopulations already submmited to reduced size (N = 5); and P3 - population derived from the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays; Genetic drift; Effective size.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000200020

Conidiogenesis of deteriorated variant of the strain Abnc of Aspergillus nidulans
Provedor de dados: 63
Autores: Giancoli,Ágata Cristiane Huppert; Pizzirani-Kleiner,Aline Aparecida.
The Abnc strain of A. nidulans carries the bncA1 gene (binucleated conidia), which induces the formation of binucleate and trinucleate conidia, displaying a chromosome I duplicated area and shifted to the chromosome II (I-&gt;II), and bringing forth genetic instability with degenerated sectors. This work has considered in a cytological level the conidiogenesis of the deteriorated variants isolated from the Abnc strain of A. nidulans, observing the event at the level of structural alterations, which composes the conidiophore, and the variations in the number of sterigmata and conidia nuclei. Cytogenetic analyses of conidiogenesis were accomplished in predetermined periods, under Giemsa stain, to observe the nuclei and analysis through the Scanning...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bristle; Conidiophore; Developmental mutants.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000400008

Bacterial strains from floodplain soils perform different plant-growth promoting processes and enhance cowpea growth
Provedor de dados: 63
Autores: Costa,Elaine Martins da; Carvalho,Fernanda de; Nóbrega,Rafaela Simão Abrahão; Silva,Jacqueline Savana; Moreira,Fatima Maria de Souza.
ABSTRACT Certain nodulating nitrogen-fixing bacteria in legumes and other nodule endophytes perform different plant-growth promoting processes. The objective of this study was to evaluate 26 bacterial strains isolated from cowpea nodules grown in floodplain soils in the Brazilian savannas, regarding performance of plant-growth promoting processes and ability to enhance cowpea growth. We also identified these strains by 16S rRNA sequencing. The following processes were evaluated: free-living biological nitrogen fixation (BNF), solubilization of calcium, aluminum and iron phosphates and production of indole-3-acetic acid (IAA). The abilities to nodulate and promote cowpea growth were evaluated in Leonard jars. Partial sequencing of the 16S rRNA gene...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Paenibacillus; Biotechnological potential; Biological nitrogen fixation; Phosphate solubilization; Indole-3-acetic acid.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000400301

Biochar from different residues on soil properties and common bean production
Provedor de dados: 63
Autores: Silva,Isley Cristiellem Bicalho da; Basílio,Josiana Jussara Nazaré; Fernandes,Luiz Arnaldo; Colen,Fernando; Sampaio,Regynaldo Arruda; Frazão,Leidivan Almeida.
ABSTRACT: The production of biochar from organic residues promises to be an interesting strategy for the management of organic waste. To assess the effect of biochar on soil properties and the production and nutrition of common bean (Phaseolus vulgaris L.), three simultaneous experiments were conducted in a greenhouse with different biochar from organic residues (rice husk, sawdust, and sorghum silage) used as filtration material for swine biofertilizer. In each experiment the treatments consisted of five different biochar concentrations (0, 25, 50, 75 and 100 L m−3), arranged in a completely randomized design, with four repetitions. In the experiments, the use of biochar increased soil pH, cation exchange capacity, nutrient availability in the soil, and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phaseolus vulgaris L.; Agricultural residues; Biochar; Soil fertility.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162017000500378

Components of the leaf area index of marandu palisadegrass swards subjected to strategies of intermittent stocking
Provedor de dados: 63
Autores: Giacomini,Alessandra Aparecida; Silva,Sila Carneiro da; Sarmento,Daniel Oliveira de Lucena; Zeferino,Cauê Varesqui; Trindade,Júlio Kuhn da; Souza Júnior,Salim Jacaúna; Guarda,Vítor del'Alamo; Sbrissia,André Fischer; Nascimento Júnior,Domicio do.
Leaf area index is the main sward characteristic related to the processes of light interception and competition in plant communities. The objective of this experiment was to quantify and evaluate the composition of the leaf area on tillers of marandu palisadegrass (Brachiaria brizantha cv. Marandu) subjected to strategies of intermittent stocking. The experiment was carried out in Piracicaba, state of São Paulo, Brazil, from October/2004 to December/2005. Swards were grazed at 95 and 100% canopy light interception (LI) to post-grazing heights of 10 and 15 cm, following a 2 ' 2 factorial arrangement with four replications in a randomised complete block design. Estimates were made of sward leaf area index, site filling, specific leaf area and the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brachiaria brizantha; Aerial tillers; Basal tillers; Site filling; Sward height.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000600002

Stingless bees damage broccoli inflorescences when collecting fibers for nest building
Provedor de dados: 63
Autores: Santos,Adriano Jorge Nunes dos; Broglio,Sônia Maria Forti; Dias-Pini,Nivia da Silva; Souza,Leilianne Alves de; Barbosa,Tiago Jorge de Araújo.
The stingless bee Trigona spinipes (Fabricius, 1793) (Hymenoptera: Apidae) is an important pollinator for various crops, but constitutes an occasional pest of other plant species since it causes injury to leaves, stems, flowers and fruits while collecting nest materials. The aim of the present study was to determine the damage caused by T. spinipes to a broccoli (Brassica oleracea L. var. italica, Brassicaceae) growing on an organic farm. A significant number of plants (72.5 %) presented damaged inflorescences, while 39% of all of the inflorescences suffered some degree of injury. The activities of T. spinipes caused scarifications on the stems of the inflorescences, and these typically evolved to epidermal cicatrices up to 10 mm wide. In some cases, the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Trigona spinipes; Occasional pest; Pest control.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162012000400008

Estimating leaf wetness duration over turfgrass, and in a 'Niagara Rosada' vineyard, in a subtropical environment
Provedor de dados: 63
Autores: Lulu,Jorge; Sentelhas,Paulo Cesar; Pedro Júnior,Mário José; Pezzopane,José Ricardo Macedo; Blain,Gabriel Constantino.
Leaf wetness duration (LWD) is a key parameter in agrometeorology because it is related to plant disease occurrence. As LWD is seldomly measured in a standard weather station it must be estimated to run warning systems for schedule chemical disease control. The objective of the present study was to estimate LWD over turfgrass considering different models with data from a standard weather station, and to evaluate the correlation between estimated LWD over turfgrass and LWD measured in a 'Niagara Rosada' vineyard, cultivated in a hedgerow training system, in Jundiaí, São Paulo State, Brazil. The wetness sensors inside the vineyard were located at the top of the plants, deployed at an inclination angle of 45º and oriented southwest, with three replications....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vitis labrusca; LWD estimate; Relative humidity; Dew point temperature.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000700004

Increasing the resistance of common bean to white mold through recurrent selection
Provedor de dados: 63
Autores: Leite,Monik Evelin; Dias,Juliana Andrade; Souza,Danuza Araujo de; Alves,Filipe Couto; Pinheiro,Lucas Rezende; Santos,João Bosco dos.
ABSTRACT White mold, caused by Sclerotinea sclerotiorum (Lib.) de Bary is one of the most important diseases of the common bean (Phaseolus vulgaris L.) worldwide. Physiological resistance and traits related to disease avoidance such as architecture contribute to field resistance. The aim of this study was to verify the efficiency of recurrent selection in physiological resistance to white mold, “Carioca” grain type and upright habit in common bean. Thirteen common bean lines with partial resistance to white mold were intercrossed by means of a circulant diallel table, and seven recurrent selection cycles were obtained. Of these cycles, progenies of the S0:1, S0:2 and S0:3 generations of cycles III, IV, V and VI were evaluated. The best (8 to 10) progenies...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sclerotinia sclerotiorum; Phaseolus vulgaris; Genetic resistance; Genetic progress.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000100071

Stability of combining ability effects in maize hybrids
Provedor de dados: 63
Autores: Machado,Juarez Campolina; Souza,João Cândido de; Ramalho,Magno Antonio Patto; Lima,José Luís.
General and specific combining ability effects are important indicators in a maize (Zea mays L.) breeding program aiming hybrid development. The objectives of the present study were to estimate the general (GCA) and specific combining abilities (SCA) effects of commercial maize hybrids using a complete diallel scheme and to assess the stabilities of these estimates. Fifty-five entries were assessed; ten commercial single-crosses and all possible double-crosses. The experiments were carried out in 12 environments in the 2005/06 growing season. A randomized complete block design was used with three replications per environment. Ear yield was evaluated, corrected to 13% of moisture content. The combined diallel analysis involving all environments was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays L.; Diallel; Nonparametric statistics.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000400010

Total soil electrical conductivity and critical soil K+ to Ca2+ and Mg2+ ratio for potato crops
Provedor de dados: 63
Autores: Reis Jr.,Roberto Anjos; Fontes,Paulo Cezar Rezende; Neves,Júlio Cesar Lima; Santos,Nerilson Terra.
Soil K+ to Ca2+ and Mg2+ ratio as well as the total salinity were evaluated in response to potassium fertilizer application onto potato. Potassium was applied at six different rates (0, 60, 120, 240, 480 and 960 kg ha-1 of K2O), as K2SO4, and was placed during planting time in the furrow. Soil from the 0-200 mm layer was collected in the furrow, 20 and 48 days after plant emergence (DAE) to evaluate soil pH, K+, Ca2+ and Mg2+ contents and the total electrical conductivity (EC). A factorial design (6x2), with six K rates and two sampling times was set up in a randomized block design with four replications. The application of K fertilizer increased exchangeable K, did not affect pH and exchangeable Ca and Mg contents, but caused a linear increase of the soil...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Solanum tuberosum; Potassium; Calcium; Magnesium; Salinity.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000400030

Processes that influence dissolved organic matter in the soil: a review
Provedor de dados: 63
Autores: Gmach,Maria Regina; Cherubin,Maurício Roberto; Kaiser,Klaus; Cerri,Carlos Eduardo Pellegrino.
ABSTRACT: In tropical regions, climate conditions favor fast decomposition of soil organic matter (SOM), releasing into the soil organic composts in solid, liquid, and gaseous forms with variable compositions. Dissolved organic matter (DOM), a complex mixture of thousands of organic compounds, is only a small fraction of the decomposition products; however, it is highly mobile and reactive to the soil. Therefore, DOM play a key role in soil aggregation (formation of organometallic complexes), energy source for microorganisms, as well as C storage, cycling, and provision of plant-available nutrients. DOM multifunctionality to sustain soil functions and important ecosystem services have raised global scientific interest in studies on DOM fractions. However,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brazil; Dissolved organic carbon; Agricultural soils; Tropical soils.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000301800

Histochemical aspects of wheat resistance to leaf blast mediated by silicon
Provedor de dados: 63
Autores: Silva,Washington Luís da; Cruz,Maria Fernanda Antunes; Fortunato,Alessandro Antônio; Rodrigues,Fabrício Ávila.
Blast, caused by Pyricularia oryzae, has become a significant disease threat to wheat (Triticum aestivum L.) in Brazil. This study aimed to investigate at the histochemical level if silicon (Si) could enhance the production of flavonoids in the leaves of wheat plants in response to P. oryzae infection. Plants from the Aliança cultivar, which are susceptible to blast, were grown in hydroponic cultures containing 0 (-Si) or 2 mM of Si (+Si) and inoculated by spraying a conidial suspension of P. oryzae (1 × 105 conidia mL−1) on all adaxial leaf surfaces of plants at 60 days after emergence (growth stage 65). The fourth and fifth leaves of each plant were used to evaluate blast severity at 24, 36, 48, 72 and 96 h after inoculation (hai). At 96 hai, leaves were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pyricularia oryzae; Flavonoids; Histochemistry; Phenolics.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162015000400322

Época de coleta, ácido indolbutírico e triptofano no enraizamento de estacas de pessegueiro
Provedor de dados: 63
Autores: Dutra,Leonardo Ferreira; Kersten,Elio; Fachinello,José Carlos.
A utilização de sementes para obtenção de porta-enxertos gera indivíduos diferentes da planta-mãe. Material homogêneo geneticamente pode ser obtido através da propagação por estaquia. Avaliaram-se os efeitos da época de coleta dos ramos, do teor de triptofano e da aplicação do ácido indolbutírico (AIB) sobre o enraizamento de estacas de pessegueiro mantidas em estufa sob nebulização intermitente. Estacas dos cultivares Diamante, Capdeboscq e BR-2 foram retiradas da porção mediana de ramos da estação de crescimento e preparadas com 12cm de comprimento, duas incisões laterais na base e um par de folhas apicais (exceto no inverno). As estacas foram tratadas imergindo sua base durante 5 segundos em solução de ácido indolbutírico nas concentrações de 0, 1000,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Prunus persica; AIB; Estação; Propagação vegetativa; Aminoácido.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000200019

Determinação da lâmina média de irrigação em pivô central
Provedor de dados: 63
Autores: Dourado Neto,D.; Van Lier,Q. de Jong; Frizzone,J. A.
Com o objetivo de melhorar a exatidão do cálculo da lâmina média d'água, por faixa representativa do coletor, apresentou-se uma expressão, considerando a variação linear de lâmina entre dois coletores subseqüentes, para fins de avaliação do sistema de irrigação do tipo pivô central. Concluiu-se que a expressão proposta deve ser utilizada para determinação da lâmina média ponderada por estar conceitualmente mais correta, apesar de na prática os valores calculados pela metodologia proposta serem muito próximos daqueles obtidos pelo cálculo tradicional.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Irrigação; Pivô central; Lâmina média ponderada.
Ano: 1994
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000100027

Least limiting water range, S-index and compressibility of a Udalf under different management systems
Provedor de dados: 63
Autores: Lima,Cláudia Liane Rodrigues de; Dupont,Patrícia Bianca; Pillon,Clenio Nailto; Miola,Ezequiel Cesar Carvalho.
ABSTRACT: Agricultural areas in the region of Turuçu, on the Southeast Hillside in the state of Rio Grande do Sul (RS), Brazil present many examples of soil physical degradation. Accordingly, strategies aimed at evaluating and ameliorating the structural quality of soils should be developed to ensure the sustainable use of these areas. This study aimed to evaluate the least limiting water range (LLWR), S-index, compressibility parameters, organic carbon and the organic matter granulometric fractions of a Udalf under different agricultural uses. Soil samples with disturbed and non-disturbed structure from the 0.00 to 0.10 m layer were collected on farms in the Southeast Hillside, Turuçu region, RS, for analyzing soil under: i) conventional system of corn...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil quality; Soil physics; Soil structure; Soil compaction.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000100100

Diallelic analysis for lysine and oil contents in maize grains
Provedor de dados: 63
Autores: Medici,Leonardo Oliveira; Gaziola,Salete Aparecida; Varisi,Vanderlei Aparecido; Paula,José Antonio Carmezini de; Ferreira,Renato Rodrigues; Azevedo,Ricardo Antunes.
Six S5 lines of maize, with differences for lysine and oil contents in grains, were used to carry out a complete series of diallelic crosses. The resulting 15 hybrids were grown in a field at two nitrogen levels (10 and 130 kg N ha-1). The general combining ability (GCA) and specific combining ability (SCA) were obtained by using the method 4, model I of Griffing for grain yield, and grain lysine and oil contents. Significant (p &lt; 0.001) interaction was observed between GCA and N levels for grain yield, indicating the selection of different lines for each N level. This interaction was not significant for lysine content, but there were significant effects of GCA for this trait at both N levels (p &lt; 0.1). Significant effects were not observed for GCA...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cereal; Opaque; Nitrogen; Proteins; Near infrared.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000200009

Phosphate fertilization and phosphorus forms in an Oxisol under no-till
Provedor de dados: 63
Autores: Olibone,Dácio; Rosolem,Ciro Antonio.
Under no-till phosphorus (P) accumulates in a few centimeters of the topsoil layer. Plant residues left on the soil surface release P and organic acids, which may improve P availability and fertilizer efficiency, including both soluble (such as triple super phosphate) and less soluble sources (such as reactive natural phosphates). In this study, soybean response to P fertilizer and P forms in the top 40 cm of an Oxisol were evaluated after surface application of different phosphates in a 5-year-old no-till system. Treatments consisted of 0 or 80 kg ha-1 of total P2O5 applied on the soil surface, both as natural reactive phosphate (NRP) or triple super phosphate (TSP). In addition, 80 kg ha-1 of P2O5 were applied to subplots, in furrows below and beside the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Reactive phosphate; Superphosphate; Phosphorus fractions; Conservation tillage.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000400014

Infection process of Phakopsora gossypii in cotton leaves
Provedor de dados: 63
Autores: Araujo,Leonardo; Guerra,Antonia Mirian Nogueira Moura; Berger,Paulo Geraldo; Rodrigues,Fabrício Ávila.
ABSTRACT Tropical rust caused by the biotrophic fungus Phakopsora gossypii is an emerging disease in cotton that has caused significant yield losses of crop/cotton cultivated in Brazil. Considering the current importance of tropical rust and the need to obtain additional basic information about its causal agent to better control this disease, the present study aimed to determine the infection process of P. gossypii in cotton leaves using scanning electron microscopy (SEM). Thirty-day-old plants were inoculated with a suspension of P. gossypii uredospores, and leaf fragments were collected 42 h after inoculation (hai) as well as 20, 25 and 35 days after inoculation (dai) for SEM observations. By 42 hai, the uredospores of P. gossypii had germinated and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gossypium hirsutum; Biotrophic fungus; Tropical rust; Uredium.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000400384

Digestible energy and protein requirements for maintenance and growth of pacu ( Piaractus mesopotamicus ): A factorial approach-based model
Provedor de dados: 63
Autores: Aguilar,Fredy Armando Aguilar; Mourão,Gerson Barreto; Cyrino,José Eurico Possebon.
ABSTRACT: Results of nutrient requirements as determined in dose-response trials are valid only for fish within the same size range of that of experimental model fish. This study used the factorial approach to estimate digestible energy (DE) and digestible protein (DP) requirements for maintenance and growth of pacu ( Piaractus mesopotamicus ). Juvenile pacu (63.5 ± 1.27 g) were stocked in a recirculation system (26.89 ± 0.36 °C) for 58 days, and fed two daily meals. One diet contained 6.96 % lipids (LF) and another 9.98 % lipids (HF), both diets formulated to contain 32 % crude protein, theoretical dietary energy level for maintenance (52.23 kJ DE kg−0.80 d−1), in a completely randomized, 2 × 5 factorial experimental design. The apparent digestibility...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Factorial modeling; Energy requirement; Dietary lipids; Digestibility; Energy utilization.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000600402

Digital-image analysis to predict weight and yields of boneless subprimal beef cuts
Provedor de dados: 63
Autores: Teira,Gustavo Adolfo; Tinois,Eduardo; Lotufo,Roberto de Alencar; Felício,Pedro Eduardo de.
For several decades, beef carcass evaluation for grading or research purposes has relied upon subjective visual scores, and manually taken measurements, but in recent times there has been a growing interest in new technologies capable of improving accuracy of estimates. Equations to predict weight and yield of beef pistol subprimal cuts were developed in this work using digital image analysis (VIA) of the 12th rib steak. Equations to predict total pistol subprimal cuts weight (CUTS) had coefficients of determination (CD) of 0.84, or 0.87 to 0.88, when the independent variables were the VIA parameters and the half carcass weight (HC) or the total pistol weight (TP), respectively. The predicted values for the total seven subprimal cuts, as a percentage of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Beef industry; Beef carcass; Image analysis; Rib eye area; Fat thickness.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000200028

Matéria seca e produção de grãos de Crotalaria juncea L. submetida à poda e adubação fosfatada
Provedor de dados: 63
Autores: Dourado,Márcio Carreira; Silva,Tiago Roque Benetoli da; Bolonhezi,Antonio César.
O estudo dos adubos verdes tem demonstrado um grande potencial na recuperação da produtividade do solo, e dentre as diversas leguminosas usadas como adubo verde, a Crotalária mostra-se muito eficiente como produtora de massa vegetal e como fixadora de nitrogênio. Este experimento foi realizado em um LATOSSOLO VERMELHO Distrófico (LVd), em Selvíria, MS, com o objetivo de avaliar os efeitos da adubação fosfatada e da poda em Crotalaria juncea L. na altura de 100 cm, na produtividade de matéria seca e sementes. O delineamento utilizado foi em blocos casualizados, em esquema fatorial 5x2 com quatro repetições. As cinco doses de P2O5 foram 0, 60, 120, 180 e 240 kg ha-1. A poda foi realizada aos 60 dias após a emergência de plântulas. Avaliaram-se quinzenalmente...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Crotalaria juncea; Poda; Sementes; Adubação fosfatada.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000200011

ALTURA DE VÔO DAS ABELHAS AFRICANIZADAS (Apis mellifera L.)  PARA COLETA DE ALIMENTOS
Provedor de dados: 63
Autores: MORETI,A.C. de C.C.; MARCHINI,L.C.
O presente trabalho foi realizado com o objetivo de verificar até que altura as abelhas africanizadas deslocam-se para a coleta de alimentos e se existe preferência destas abelhas por alguma altura. Instalou-se, num eucalipto de mais de 30m, um sistema de roldana que possibilitava a colocação de armadilhas a diferentes alturas, para a captura dos insetos que ali fossem se alimentar. As médias do número de abelhas coletadas em sete alturas (de 0 a 30m) decresceram com o aumento da altura e o melhor ajuste foi o de um polinômio linear. No detalhamento da primeira altura (0-5m), que apresentou a maior concentração de abelhas, o melhor ajuste foi o de um polinômio de segundo grau, com um máximo entre 1 e 2m, apesar da maior media observada corresponder à...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Abelhas africanizadas; Apis mellifera; Altura de vôo; Coleta de alimentos.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000200014

Qualidades física e fisiológica de sementes de amendoim submetidas a gesso agrícola: I. Área com calagem
Provedor de dados: 63
Autores: Spinola,Maria Cristina Mingues; Cícero,Silvio Moure.
O presente trabalho foi conduzido com sementes de amendoim (Arachis hypogaea L.), cv. "Tatu", em blocos casualizados, com três repetições. Os tratamentos consistiram de doses de gesso agrícola (0, 400, 800, 1200 kg/ha), épocas de aplicação (semeadura e florescimento) e localização do gesso agrícola (área total e sulcos de semeadura) em área previamente submetida à calagem (70% de saturação de bases). Foi realizada adubação de semeadura à base de fósforo (80kg/ha de P2O5) e potássio (30kg/ha de K2O5). As avaliações da qualidade das sementes foram realizadas por meio da massa de 100 sementes, teste de germinação, testes de vigor (primeira contagem de germinação, envelhecimento acelerado, condutividade elétrica, emergência de plântulas em campo) e...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Calagem; Gesso agrícola; Cálcio; Qualidade fisiológica; Vigor.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000100019

Application of the Hybrid-Maize model for limits to maize productivity analysis in a semiarid environment
Provedor de dados: 63
Autores: Liu,Yi; Yang,Shenjiao; Li,Shiqing; Chen,Fang.
Effects of meteorological variables on crop production can be evaluated using various models. We have evaluated the ability of the Hybrid-Maize model to simulate growth, development and grain yield of maize (Zea mays L.) cultivated on the Loess Plateau, China, and applied it to assess effects of meteorological variations on the performance of maize under rain-fed and irrigated conditions. The model was calibrated and evaluated with data obtained from field experiments performed in 2007 and 2008, then applied to yield determinants using daily weather data for 2005-2009, in simulations under both rain-fed and irrigated conditions. The model accurately simulated Leaf Area Index , biomass, and soil water data from the field experiments in both years, with...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Crop simulation; Maize model; Potential productivity; Water stress; Spring maize.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162012000500003

Respostas de crescimento da pupunheira à adubação NPK
Provedor de dados: 63
Autores: Bovi,Marilene Leão Alves; Godoy Jr.,Gentil; Spiering,Sandra Heiden.
As palmeiras apresentam grande demanda por nutrientes. Por este motivo, o efeito da adubação NPK no crescimento de pupunheiras (Bactris gasipaes Kunth) foi estudado durante 30 meses (11/90 a 04/93) em experimento conduzido a campo em solo Aluvial álico (corrigido por meio de calagem) em Ubatuba, SP (clima "Cfa"). Utilizou-se o delineamento de blocos ao acaso, com uma repetição, em esquema fatorial fracionado (½ de 4³), com tratamentos dispostos em dois blocos, parcelas úteis de 24 plantas e bordaduras duplas ao redor. Foram testadas quatro doses de nitrogênio (0, 100, 200 e 400 kg ha-1 ano-1 de N), fósforo (0, 50, 100 e 200 kg ha-1 ano-1 de P2O5) e potássio (0, 50, 100 e 200 kg ha-1 ano-1 de K2O), aplicadas em faixa e divididas em cinco aplicações anuais,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bactris gasipaes; Nutrição mineral; Absorção de nutriente; Diâmetro da planta.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000100023

Cooperativa-escola nas Escolas Técnicas Agrícolas
Provedor de dados: 63
Autores: Marques,P.V.; Love,H.G.
A dificuldade de gerenciar recursos e proporcionar melhores condições de ensino para os estudantes são algumas das deficiência das Escolas Técnicas Agrícolas (ETAs) brasileiras, problemas parcialmente superados por algumas escolas que adotaram a chamada Cooperativa-Escola. Neste trabalho, procura-se discutir alguns aspectos filosóficos referentes às ETAs e como a Cooperativa-Escola pode ajudar a solucionar seus principais problemas educativos e administrativos; um estudo de caso utilizando-se a técnica de auditoria administrativa foi desenvolvido numa ETA cuja Cooperativa-Escola é considerada um modelo de bom funcionamento e alguns procedimentos foram descritos, objetivando-se estender a prática de Cooperativa-Escola para outras escolas técnicas agrícolas...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Escola Técnica Agrícola; Cooperativa-Escola; Auditoria Administrativa.
Ano: 1993
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161993000300028

Biologia reprodutiva de etnovariedades de mandioca
Provedor de dados: 63
Autores: Silva,Rainério Meireles da; Bandel,Gerhard; Faraldo,Maria Inez Fernandes; Martins,Paulo Sodero.
O conhecimento da biologia reprodutiva da mandioca é essencial para o desenvolvimento de programas de melhoramento genético e compreensão do processo de domesticação. Este trabalho avalia aspectos que influenciam a reprodução sexuada, tais como morfologia floral, ecologia da polinização, produção e viabilidade dos grãos de pólen, apomixia, produção e germinação de sementes de etnovariedades de mandioca coletadas em roças de caboclos e índios da Região Amazônica e do Estado de São Paulo. Os aspectos da biologia reprodutiva foram estudados a partir de avaliações de campo e coleta de botões florais e sementes. Os experimentos foram realizados em Piracicaba, SP. Constatou-se alteração na morfologia floral da etnovariedade DG-55, a qual possui flores...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Manihot esculenta; Biologia reprodutiva; Etnovariedades; Morfologia floral.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000100016

Método bootstrap aplicados em níveis de reamostragem na estimação de parâmetros genéticos populacionais
Provedor de dados: 63
Autores: Carlini-Garcia,Luciana Aparecida; Vencovsky,Roland; Coelho,Alexandre Siqueira Guedes.
Marcadores isoenzimáticos ou moleculares têm sido empregados em estudos da estrutura genética e do sistema reprodutivo de populações naturais. Parâmetros genéticos populacionais de interesse são estimados, porém, há pouca informação sobre o erro associado a essas estimativas em função dos diferentes níveis de amostragem. Neste trabalho, o método de reamostragem bootstrap foi aplicado sobre locos, indivíduos, populações e indivíduos e populações concomitantemente, em dados de populações naturais. Para os parâmetros índice de fixação total (F ), índice de fixação intrapopulacional ( f ), diversidade entre populações (teta) e taxa aparente de cruzamento (t a) foram obtidos, em função das fontes de reamostragem, os erros associados às estimativas desses...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Estrutura populacional; Genética de populações; Estimação.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000400021

Practicability of somatic cell count and electrical conductivity as subclinical mastitis diagnostic tests in camels (Camelus dromedarius)
Provedor de dados: 63
Autores: Aljumaah,Riyadh Saleh; Almutairi,Fares; Ayadi,Moez; Alshaikh,Mohammed Abdulrahman; Al-Haidary,Ahmed Abrahim; Samara,Emad Mohammed.
ABSTRACT Critical gaps exist in our understanding of the diagnostic reliability of subclinical mastitis tests in dromedary camels. Using a retrospective longitudinal cross-sectional approach, 191 lactating camels were randomly sampled from 47 camel herds to investigate at first the practicability of somatic cell count (SCC) and electrical conductivity (EC) tests as subclinical mastitis tests in camels through their validations by California mastitis test (CMT) score, and then through the subsequent employments of those objective means in assessing certain potential risk markers predisposing camels to this disease. Results indicate the reliability and validity of SCC test, in contrast to EC test, in distinguishing subclinical mastitic udders in camels, as...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dairy; Milk production; Risk marker; Human consumption; Welfare.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000400402

Poultry by-product meal as dietary protein source for dourado, Salminus brasiliensis: an economic appraisal
Provedor de dados: 63
Autores: Donadelli,Renan Antunes; Aguilar,Fredy Armando Aguilar; Sonoda,Daniel Yokoyama; Cyrino,José Eurico Possebon.
ABSTRACT: The dourado, Salminus brasiliensis, a large, carnivorous, Neotropical, Characin, is highly regarded for fish farming and sport fishing alike. However, studies on the farming and husbandry of dourado are still scarce. This study evaluated the performance of dourado fed diets formulated so as to contain increasing levels of poultry by-product meal as a replacement for fish meal and aimed to identify the maximum level of replacement to maximize profit. The trial was set up in a closed recirculation system with controlled water quality (temperature 27 °C, dissolved oxygen 6.5 mg L−1, pH 7.4, and ammonia 0.25 mg L−1). Juvenile fish were stocked in tanks in a completely randomized design, acclimatized to system conditions and experimental diets, and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fish nutrition; Alternative feedstuffs; Economic evaluation.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162019001300190

Macronutrientes em mudas de citros cultivadas em vasos em resposta à adubação NPK
Provedor de dados: 63
Autores: Bernardi,Alberto Carlos de Campos; Carmello,Quirino Augusto de Camargo; Carvalho,Sérgio Alves de.
Mudas de laranjeira 'Valência' (Citrus sinensis) sobre o porta-enxerto de limoeiro 'Cravo' (C. limonia) foram cultivadas em vasos com substrato de casca de Pinus, vermiculita e perlita com o objetivo de avaliar-se os efeitos do fornecimento de N, P e K sobre os teores de macronutrientes do porta-enxerto e das mudas. Utilizou-se um esquema de fatorial fracionário (1/5)5³ com um delineamento em blocos ao acaso. Os tratamentos consistiram em 5 doses (em g por planta) de N: 1,25; 6,25; 11,25; 16,25; 21,25; 5 doses de K: 0,42; 3,75; 6,22; 9,34; 12,45; e 5 doses de P: 0,19; 0,89; 1,59; 2,29; 2,99. O N e K foram fornecidos semanalmente, sendo 37,5% da dose para o porta-enxerto. O P foi fornecido totalmente no plantio. Determinaram-se os teores totais de N, P e K,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Citrus sinensis; Citrus limonia; Superfície de resposta; Nutrição mineral.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000400026

Automatically controlled deficit irrigation of lettuce in “organic potponics”
Provedor de dados: 63
Autores: Valença,David da Cunha; Carvalho,Daniel Fonseca de; Reinert,Fernanda; Azevedo,Ricardo Antunes; Pinho,Camila Ferreira de; Medici,Leonardo Oliveira.
ABSTRACT: Concerns with water crisis involve all sectors of society and irrigated agriculture remains the main water consumer. This study evaluated an agricultural production system for lettuce cultivation in greenhouse, “organic potponics”, to economize water and manure use, using a Simplified Irrigation Controller (SIC), based on soil matric potential monitoring. Five irrigation volumes were evaluated in pots with 4.8 L, fertilized with 200 g of vermicompost. One of the volumes was controlled with the SIC. The other volumes represented 130, 80, 60 and 33 % of that controlled by the SIC and all treatments received water at the same time. Shoot fresh weight, head diameter and stomatal conductance (gs) increased linearly with irrigation volumes. For shoot...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lactuca sativa; Water use efficiency; Production system; Water management; Automation.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162018000100052

PLANT TRANSFORMATION: ADVANCES AND PERSPECTIVES
Provedor de dados: 63
Autores: Alves,Adriana Cristina; Quecini,Vera Maria; Vieira,Maria Lucia Carneiro.
Genetic transformation is a powerful tool for plant breeding and genetical, physiological or biochemical research, consequently it is an extremely dynamic field. Transgenic plants are commonly used to complete or substitute mutants in basic research, helping the studies of complex biological situations such as pathogenesis process, genome organization, light reception and signal transduction. In this review, recent approaches for foreign gene introduction (e.g. Agrobiolistics, whole tissue electroporation, in planta Agrobacterium transformation), screening (reporter gene possibilities and performance) and transformant selection (ipt selective marker) are discussed. Transgene expression and mechanisms underlying (trans)gene inactivation are presented....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Plant transformation; Agrobiolistics; Electroporation; Reporter genes; Transgenic crops.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000100001

Muskmelon seed germination and seedling development in response to seed priming
Provedor de dados: 63
Autores: Nascimento,Warley Marcos.
Important factors affecting seed priming have not been extensively reported in muskmelon (Cucumis melo L.) studies. The optimization of the seed priming technique becomes very important at the commercial scale. Little information has been reported on seedling development of muskmelon subsequent to seed priming. Seeds of muskmelon were primed in darkness at 25°C in different solutions and three osmotic potentials. Seeds were also primed with and without aeration during different periods. In relation to osmotic solutions, an osmotic potential around -1.30 MPa is most adequate for muskmelon priming. Salt solutions gave better germination rate but were deleterious for seed germination, especially at higher osmotic potentials. Aeration of the soaking salt...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cucumis melo; Osmoconditioning; Stand establishment.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000100011

Características agronômicas e nutricionais do milho adubado com nitrogênio, molibdênio e zinco
Provedor de dados: 63
Autores: Ferreira,Alexandre Cunha de Barcellos; Araújo,Geraldo Antônio de Andrade; Pereira,Paulo Roberto Gomes; Cardoso,Antônio Américo.
A adubação é um dos fatores que mais contribui para o aumento da produtividade do milho, podendo influenciar a qualidade dos grãos. Este trabalho foi conduzido num Argissolo Vermelho-Amarelo distrófico, visando avaliar os efeitos da adubação com N, Mo e Zn sobre a produção e qualidade de grãos de milho, sob o aspecto protéico e teor de nutrientes minerais; avaliar a época mais adequada para amostragem e análise foliar de N nas formas de N orgânico, N-NO3- e N total (NO3- + N orgânico) e relacionar a composição mineral das folhas e dos grãos de milho. Utilizou-se um delineamento em blocos ao acaso com quatro repetições, em esquema fatorial com quatro doses de N (0, 70, 140 e 210 kg ha-1), duas doses de Mo (0 e 90 g ha-1) e duas de Zn (0 e 3 kg ha-1). As...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays; Produção de grãos; Teor de proteína; Teor de minerais; Adubação mineral.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000100020

Uniformidade de sistemas de irrigação localizada: validação de equações
Provedor de dados: 63
Autores: Favetta,Gilberto Manilli; Botrel,Tarlei Arriel.
O coeficiente de uniformidade nos sistemas de irrigação localizada é importante por permitir a avaliação de sistemas ou somente projetados. Quanto aos diferentes métodos aplicáveis, é importante que se defina a correlação entre os mesmos, de forma a permitir a comparação entre os equipamentos. Para avaliação da eficácia de equações de correlação entre os coeficientes de uniformidade de emissão, uniformidade de emissão absoluta e uniformidade estatística, foram comparados os resultados de sua aplicação com valores obtidos pelo uso convencional de cada um desses métodos. A avaliação foi feita a partir de dados obtidos pela aplicação dos três métodos em dois diferentes sistemas de irrigação por microaspersão implantados, tendo sido usado como referência para...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Uniformidade de distribuição; Irrigação localizada.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000200030

Retenção de proteína e energia em juvenis de "black bass" Micropterus salmoides
Provedor de dados: 63
Autores: Cyrino,José Eurico Possebon; Portz,Leandro; Martino,Ricardo Cavalcanti.
O objetivo deste trabalho foi avaliar alterações nas formas de reserva de energia na carcaça de juvenis de "black bass" (14,46 ± 0,81 g de peso vivo). Peixes condicionados a aceitar alimento artificial foram estocados em 90 gaiolas de volume 60 L alojadas em caixas de 1.000 L em laboratório com condições ambientais controladas, e alimentados por 64 dias com rações extrusadas com níveis de proteína variando entre 34 e 54% (incrementos de 4%) e teores de energia digestível variando de 3.600 a 4.100 kcal kg-1 de alimento (incrementos de 125 kcal kg-1). Foram analisados as variáveis de ganho de peso, consumo alimentar diário, relação hepato-somática, relação víscero-somática, deposição protéica e energética, glicogênio tecidual hepático e lipídio visceral. Não...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Micropterus salmoides; Proteína; Energia; Glicogênio; Lipídio.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000400003

Effectiveness of horizontal air flow fans supporting natural ventilation in a Mediterranean multi-span greenhouse
Provedor de dados: 63
Autores: López,Alejandro; Valera,Diego Luis; Molina-Aiz,Francisco Domingo; Peña,Araceli.
Natural ventilation is the most important method of climate control in Mediterranean greenhouses. In this study, the microclimate and air flow inside a Mediterranean greenhouse were evaluated by means of sonic anemometry. Experiments were carried out in conditions of moderate wind (≈ 4.0 m s-1), and at low wind speed (≈ 1.8 m s-1) the natural ventilation of the greenhouse was supplemented by two horizontal air flow fans. The greenhouse is equipped with a single roof vent opening to the windward side and two side vents, the windward one being blocked by another greenhouse close to it, while the leeward one is free of obstacles. When no fans are used, air enters through the roof vent and exits through both side vents, thus flowing contrary to the thermal...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Climate control; Microlimate; Sonic anemometry.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162013000400001

Seleção de iscas celulósicas para o cupim Heterotermes tenuis (isoptera: rhinotermitidae) em cultura de cana-de-açúcar
Provedor de dados: 63
Autores: CAMPOS,M.B.S.; ALVES,S.B.; MACEDO,N.
Estudou-se em condições de campo a atratividade ao cupim subterrâneo Heterotermes tenuis (H.,1858), importante praga da cana-de-açúcar no Brasil, de dezessete produtos com alto teor celulósico (bagaço de cana-de-açúcar "in natura"-T1; bagaço de cana + papelão ondulado picado-T2; bagaço de cana + açúcar refinado-T3; bagaço de cana + açúcar refinado + papelão picado-T4; bagaço de cana-de-açúcar decomposto-T5; bagaço decomposto + papelão picado-T6; bagaço decomposto + açúcar refinado-T7; bagaço decomposto + papelão picado + açúcar refinado-T8; torta de filtro "in natura"-T9; torta de filtro decomposta-T10; rolão de milho-T11; fezes frescas e secas de bovino-T12; papelão ondulado picado-T13; papel toalha picado-T14; serragem de pinus-T15; papelão ondulado...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Insecta; Cupins; Armadilhas.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000300017

Recurrent mass selection for upright plant architecture in common bean
Provedor de dados: 63
Autores: Pires,Luiz Paulo Miranda; Ramalho,Magno Antonio Patto; Abreu,Ângela de Fátima Barbosa; Ferreira,Monica Christina.
Plant with a more upright architecture offers many advantages to farmers. Recurrent mass selection (RS) programs for carioca type common bean have been implemented for the purpose of obtaining new lines that will generate the high yields that are associated with upright plant archi tecture. This study aimed to assess the efficiency of recurrent mass selection (RS) for upright plant architecture in common bean (Phaseolus vulgaris) and the effect of RS on grain yield and to verify whether or not there is still variability in the population that favors continuing selection programs, using information obtained from progenies evaluated in cycle five (CV) and cycle eight (CVIII) of the RS program. Mass selection for more upright plants was performed visually in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Plant Breeding; Genetic progress; Genetic variability.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162014000300009

Reuse of sand, crushed sugarcane and peanut hull-based substrates for cherry tomato cultivation
Provedor de dados: 63
Autores: Fernandes,Carolina; Corá,José Eduardo; Braz,Leila Trevizan.
The reuse of substrates for more than one growing season is an alternative to reduce production costs. The objective of this work was to evaluate the yield and quality fruits of the cherry tomato (Lycopersicon esculentum) grown in reused substrates. The experimental design was a complete randomized block, with a factorial array of 7 × 2 (seven substrates and two growth periods), with four replications. The seven substrates consisted of different combinations of sand (S), crushed sugarcane (CS) and peanut hull (PH). The substrates used were: S1 = S; S2 = [(2/3 S) + (1/3 CS)]; S3 = [(2/3 S) + (1/3 PH)]; S4 = [(2/3 S) + (1/6 CS) + (1/6 PH)]; S5 = [(1/2 S) + (1/2 CS)]; S6 = [(1/2 S) + (1/2 PH)] and S7 = [(1/3 S) + (1/3 CS) + (1/3 PH)]. These substrates were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lycopersicon esculentum; Size of fruits; Soilless growth.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000600011

Competition effects with mixed stands of wheat and kochia (Kochia scoparia) biotypes resistant and susceptible to acetolactase synthase inhibitor herbicides
Provedor de dados: 63
Autores: Christoffoleti,P.J.; Westra,P.
Greenhouse experiments were conducted to compare the competitive ability of sulfonylurea resistant and susceptible kochia (Kochia scoparia L. Schard) compared to wheat. The results of several replacement series experiments indicate that wheat was the dominant competitor, and an average of one wheat plant reduced resistant kochia yield per plant equal to the effect of 4.8 resistant kochia or 5.4 susceptible kochia plants. Intraspeciflc competition was more important than interspecific competition for wheat, whereas the reverse was true for the resistant and susceptible kochia. The results of the niche differentiation index (NDI) indicate that wheat and either resistant or susceptible kochia are only partly limited by the same resources. The resistant and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Weed; Herbicide resistance; Sulfonylurea; Kochia scoparia; Weed-crop competition.
Ano: 1994
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000200008

Chemical attributes of a degraded soil after application of water treatment sludges
Provedor de dados: 63
Autores: Silva,Érica Tomé da; Melo,Wanderley José de; Teixeira,Sandra Tereza.
Mining is an activity that tends to degrade the environment. The restoration of mining areas, aims to accelerate and improve the succession process according to its future use. The objective of this work was to rehabilitate a soil degraded by tin mining activities in the Amazon Basin (Jamari National Forest, State of Rondônia) with the application of water treatment sludge (WTS), and verify the effect of sludge on values of pH (CaCl2 0.01 mol L-1), organic matter, P, Ca, Mg, K, H+Al, and soil micronutrient contents when cultivated with native plants, legumes, and grass species. A factorial (3 X 5) experimental design was used to optimize the rehabilitation of these areas including three N rates (100, 200, and 300 mg N kg-1 soil supplied by WTS), five plant...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil fertility; Micronutrient; Tin mining; Soil reclaiming; Residue.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000600008

Phenotypic, cytogenetic and spike fertility characterization of a population of male-sterile triticale
Provedor de dados: 63
Autores: Guerra,Divanilde; Pacheco,Marcelo Teixeira; Federizzi,Luiz Carlos.
Triticale (X Triticosecale Wittmack) is a good cereal for production of flour and feed. A segregating population of triticale was developed from a male-sterile (MS) plant. To determine whether this new source of male sterility in triticale is appropriate for use in breeding programs the expression of the male sterility phenotype was characterized through spike fertility, meiotic behavior, and pollen. Controlled crosses between male-sterile plants and control varieties male-fertile (MF) of triticale were also conducted, and cytological analyses were performed in the F2 and backcross plants. Plants with male-sterile phenotypes displayed reduced spike fertility when compared to plants with male-fertile phenotypes. Compared to male-fertile plants, male-sterile...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Male sterility; Meiotic behavior; Pollen fertility; Productivity.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162013000100007

Biological aspects and predatory capacity of Podisus nigrispinus (Dallas) (Hemiptera: Pentatomidae) fed on Alabama argillacea (Hübner) (Lepidoptera: Noctuidae) reared on cotton genotypes
Provedor de dados: 63
Autores: Santos,Terezinha Monteiro dos; Boiça Jr.,Arlindo Leal.
Host plants may influence indirectly biological characteristics of predators, on a positive or negative way, poiting out the importance of studies evaluating the effect of cultivars on the third trophic level. This study evaluates the biological aspects and predatory capacity of Podisus nigrispinus adults fed Alabama argillacea larvae reared on cotton genotypes. The predator was fed daily with fourth instar larvae reared on leaves of the following genotypes CNPA Precoce 1 (hirsute), CNPA 9211-31 (high gossypol level), CNPA 9211-41 (medium gossypol level) and GL2 GL3 (gossypol glandless). The pre-oviposition, oviposition and post-oviposition periods and the oviposition capacity of P. nigripinus were not affected when preyed on cotton leafworms reared on the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cotton leafworm; Predator; Biological control; Plant resistance.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000400008

EFEITO DE ÉPOCAS DE SEMEADURA NA FISIOLOGIA E PRODUÇÃO DE FITOMASSA DE LEGUMINOSAS NOS CERRADOS DA REGIÃO DO MATOGROSSO DE GOIÁS
Provedor de dados: 63
Autores: Amabile,R.F.; Carvalho,A.M. de; Duarte,J.B.; Fancelli,A.L.
A adubação verde é uma prática conservacionista pouco utilizada nos Cerrados do Brasil Central. Visando obter informações sobre as características fenológicas das espécies de leguminosas utilizadas como adubos verdes, em diferentes épocas de semeadura na Região dos Cerrados, instalaram-se três experimentos, durante o ano agrícola de 1991/92, na área experimental do Centro Nacional de Pesquisa de Solos/Coordenadoria Regional Centro-Oeste - EMBRAPA, localizada na Estação Experimental da Empresa Goiana de Pesquisa Agropecuária - EMGOPA, em Senador Canedo, GO. As espécies testadas foram a Crotalaria juncea L., mucuna preta (Mucuna aterrima (Piper &amp;amp; Tracy) Merr.), guandu (Cajanus cajan (L.) Millsp.) e feijão-bravo do Ceará (Canavalia brasiliensis), em...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Crotalaria juncea; Mucuna aterrima; Canavalia brasiliensis; Cajanus cajan; Épocas de semeadura.
Ano: 1996
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161996000200018

Soil and crop residue CO2-C emission under tillage systems in sugarcane-producing areas of southern Brazil
Provedor de dados: 63
Autores: Teixeira,Luís Gustavo; Corradi,Mariana Marotti; Fukuda,Adrian; Panosso,Alan Rodrigo; Reicosky,Donald; Lopes,Afonso; La Scala Jr.,Newton.
Appropriate management of agricultural crop residues could result in increases on soil organic carbon (SOC) and help to mitigate gas effect. To distinguish the contributions of SOC and sugarcane (Saccharum spp.) residues to the short-term CO2-C loss, we studied the influence of several tillage systems: heavy offset disk harrow (HO), chisel plow (CP), rotary tiller (RT), and sugarcane mill tiller (SM) in 2008, and CP, RT, SM, moldboard (MP), and subsoiler (SUB) in 2009, with and without sugarcane residues relative to no-till (NT) in the sugarcane producing region of Brazil. Soil CO2-C emissions were measured daily for two weeks after tillage using portable soil respiration systems. Daily CO2-C emissions declined after tillage regardless of tillage system....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil respiration; Carbon dioxide; Emission after tillage; Soil organic carbon.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162013000500007

Avaliação do desempenho de sementes de milho submetidas à remoção parcial do endosperma e do pericarpo
Provedor de dados: 63
Autores: Silva,W.R. da; Chamma,H.M.C.P.; Novembre,A.D. da L.C.; Moraes,M.H.D. de.
Objetivando verificar a interferência da excisão de partes da semente de milho no desempenho biológico, a pesquisa foi conduzida a partir de tratamentos representados por remoções aproximadas de 0, 14, 28 e 37%, em peso, sem que o embrião fosse diretamente afetado. A avaliação, conduzida em laboratório (germinação e vigor) e em campo (emergência e produção), permitiu as seguintes conclusões: - Há a possibilidade biológica de excisar parte (±14% em peso) da semente de milho, em pré-semeadura e com tratamento fungicida, em lotes de alta qualidade fisiológica a serem utilizados em regiões favoráveis ao desenvolvimento da espécie; a retirada de partes da semente de milho contribui para a redução do seu potencial de conservação.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sementes; Excisão de partes; Milho.
Ano: 1994
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000100021

Micropropagation, seed propagation and germplasm bank of Mandevilla velutina (Mart.) Woodson
Provedor de dados: 63
Autores: Biondo,Ronaldo; Souza,Ana Valéria; Bertoni,Bianca Waléria; Soares,Andreimar Martins; França,Suzelei Castro; Pereira,Ana Maria Soares.
Mandevilla velutina (Mart.) Woodson (Apocynaceae) is a medicinal plant species with antivenom properties, native from Brazilian Savanna regions (Cerrado), which due to overexploitation and habitat deforestation is in danger of extinction. As an initiative for conserving this endangered but economically important plant species, a micropropagation protocol was developed and genotypes were stored in the Germplasm Bank "Cerrado In vitro". For the in vitro propagation of M. velutina, nodal segments were inoculated on Murashige and Skoog (MS) medium supplemented with different concentrations of BA, Zeatin, 2ip, DTT and TDZ. Best multiplication ratio was achieved when to the medium 0.44 µM BA, ranging 1: 6.7, were added. Plantlets cultured on MS/2 medium...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Apocynaceae; Cerrado; Medicinal plant.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000300008

Estirpes de Rhizobium tropici na inoculação do feijoeiro
Provedor de dados: 63
Autores: Ferreira,Alessandro Nunes; Arf,Orivaldo; Carvalho,Marco Antonio Camillo de; Araújo,Ricardo Silva; Sá,Marco Eustáquio de; Buzetti,Salatiér.
Avaliando o comportamento do feijoeiro inoculado com cinco estirpes de Rhizobium tropici e a adubação mineral com nitrogênio, sobre alguns fatores relacionados à sua produtividade, utilizou-se um delineamento experimental de blocos ao acaso, com oito tratamentos constituídos pela inoculação do feijoeiro cultivar IAC Carioca com cinco estirpes de Rhizobium tropici (CIAT 899 - estirpe referência; F35; F54; F81 e CM255), dois controles sem inoculação sendo um adubado com N na semeadura e em cobertura e outro sem adubação e um cultivar não nodulante (NORH 54) adubado; com seis repetições. Avaliaram-se: número de nódulos por planta; massa de material seco da parte aérea; teor de N nas folhas; número de vagens por planta; número de grãos por planta; número de...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phaseolus vulgaris; Feijão; Fixação biológica de nitrogênio.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000300021

COMPORTAMENTO DE HERBICIDA EM SOLO DE VÁRZEA COM DRENAGEM SUBTERRÂNEA
Provedor de dados: 63
Autores: CRUCIANI,D.E.; BAPTISTA,G.C.; CHRISTOFFOLETI,P.J.; MINAMI,K.
O conhecimento do comportamento de herbicidas é fundamental na avaliação de sua eficácia na agricultura e na compreensão do impacto ambiental causado por estes produtos químicos. A drenagem do solo pode influir no comportamento do herbicida pois pode atuar como fator modificador de sua mobilidade, transporte, arraste superficial e infiltração no solo e consequentemente, da contaminação de águas subterrâneas. A presente pesquisa teve por objetivo verificar o efeito de um sistema de drenagem subterrâneo sobre o arraste lateral, lixiviação e contaminação do lençol freático pelo herbicida trifluralina aplicado em pré-emergência na cultura do milho. Os resultados obtidos das avaliações efetuadas na superfície do solo, na profundidade de 0 - 15 cm e na água de...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Drenagem; Herbicida; Trifluralina; Ambiente.
Ano: 1996
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161996000200021

Suscetibilidade de Oligonychus yothersi (Acari: Tetranychidae) ao fungo Beauveria bassiana
Provedor de dados: 63
Autores: Oliveira,Renato Cassol de; Alves,Luis Francisco Angeli; Neves,Pedro Manuel Oliveira Janeiro.
A cultura da erva-mate (Ilex paraguariensis) é uma importante atividade econômica no Sul do Brasil. Com o aumento de consumo nos anos oitenta, cresceram também as áreas de monocultura, gerando condições favoráveis para o aumento populacional de insetos e ácaros fitófagos, entre eles o ácaro vermelho Oligonychus yothersi. Este estudo avaliou a suscetibilidade do ácaro vermelho O. yothersi a vários isolados do fungo Beauveria bassiana. O experimento foi conduzido em Cascavel, PR. Discos foliares de erva-mate (2,2 cm²) foram previamente infestados com 20 fêmeas adultas. Alíquotas de 1 mL de cada suspensão de conídios dos diferentes isolados de B. bassiana, ajustadas na concentração de 1,0x10(8) conídios mL-1 foram pulverizadas, separadamente, sobre um...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Ácaro vermelho; Erva-mate; Fungo entomopatogênico.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000100027

Natural colorants improved the physicochemical and sensorial properties of frozen Brazilian sausage (linguiça) with reduced nitrite
Provedor de dados: 63
Autores: Bellucci,Elisa Rafaela Bonadio; Barretto,Tiago Luís; Rodriguez,José Manuel Lorenzo; Bis-Souza,Camila Vespúcio; Barba,Francisco Jose; Barretto,Andrea Carla da Silva.
ABSTRACT: The use of natural colorants in meat products can keep its coloring attractive as well as meet the demand from consumers interested in products that are healthier. Nitrite is added as a preservative to these products and it is also a precursor of the generation of a specifically desired color in meat products. However, its use has been associated with the development of certain kinds of cancer. The objective of this study was to evaluate the effect of reduced levels of nitrite in Brazilian sausage (linguiça) with natural colorants on the physicochemical and sensorial properties following frozen storage. Nine treatments were tested: 0.015 % nitrite (C150), 0.0075 % nitrite (C75) and 0 % nitrite (C0), 0.0075 % nitrite and 1.5 % microencapsulated...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Betalain; Sensory evaluation; Cochineal carmine; Lipid oxidation.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000300902

Comparation of logistic regression methods and discrete choice model in the selection of habitats
Provedor de dados: 63
Autores: Cardozo,Sandra Vergara; Manly,Bryan Frederick John; Dias,Carlos Tadeu dos Santos.
Based on a review of most recent data analyses on resource selection by animals as well as on recent suggestions that indicate the lack of an unified statistical theory that shows how resource selection can be detected and measured, the authors suggest that the concept of resource selection function (RSF) can be the base for the development of a theory. The revision of discrete choice models (DCM) is suggested as an approximation to estimate the RSF when the choice of animal or groups of animals involves different sets of available resource units. The definition of RSF requires that the resource which is being studied consists of discrete units. The statistical method often used to estimate the RSF is the logistic regression but DCM can also be used. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Resource selection; Maximum likelihood; Binomial distribution; Comparison test.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000300011

Fatores ecofisiológicos que afetam o comportamento do milho em semeadura tardia (safrinha) no Brasil Central
Provedor de dados: 63
Autores: Durães,F.O.M.; Magalhães,RC.; Costa,J.D.; Fancelli,A.L.
O presente trabalho teve por objetivo avaliar as relações entre fonte de assimilados e grão-dreno, bem como o comportamento de fatores morfo-fisiológicos que limitam o rendimento de grãos em plantas de milho de diferentes ciclos (normal, precoce e superprecoce), cultivadas em semeadura tardia (safrinha), com três densidades (33 mil, 55 mil e 77 mil plantas/ha). Verificou-se a eficiência de híbridos de milho quanto à duração do crescimento e rendimento, nas fases vegetativa e reprodutiva. Os rendimentos em grãos variaram entre os híbridos e entre as densidades e foram significativamente superiores nas maiores densidades de cultivo, para os três híbridos avaliados. Valores máximos de índice de área foliar, dentro de híbrido, resultaram em maiores rendimentos...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays L.; Híbridos; Ciclos; Densidade; Safrinha; Grão-dreno.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000300014

Scheduling optimum planting window for gladiola based on El Niño Southern Oscillation
Provedor de dados: 63
Autores: Becker,Camila Coelho; Streck,Nereu Augusto; Uhlmann,Lilian Osmari; Silveira,Waleska Bolson.
ABSTRACT: Gladiola is an important cut flower worldwide and scheduling field gladiola production is largely dependent on planting at the correct time since its development is controlled by the air temperature. The aim of this study was to configure a planting window of gladiola in order to harvest spikes to be sold on All Souls' Day and Mother's Day holidays in the state of Rio Grande do Sul, Brazil, taking into account the El Niño Southern Oscillation (ENSO) phases. The PhenoGlad model, a dynamic process-based simulation model that simulates gladiola phenology on a daily time step was used in this study. Daily minimum and maximum temperatures over 55 years (1961-2015) from 18 weather stations across Rio Grande do Sul state, Brazil, were used as input data...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: PhenoGlad; Peaks of consumption; Scheduling flowering; Temperature; Target date.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000500301

Empirical models to predict feed intake of growing-finishing pigs reared under high environmental temperatures
Provedor de dados: 63
Autores: Perondi,Dani; Kipper,Marcos; Andretta,Ines; Hauschild,Luciano; Lunedo,Raquel; Franceschina,Carolina Schell; Remus,Aline.
ABSTRACT Several empirical models were proposed to predict feed intake (FI) of growingfinishing pigs reared under high environmental temperatures. However, these models have not been evaluated under conditions different from those in which they were developed. Twelve empirical models were evaluated using a database built after systematic literature review (observed data: 28 studies in which the FI was evaluated in pigs under high environmental temperatures). Model accuracy was assessed using the mean squared of prediction error (MSPE). Analyses were performed considering two scenarios: (1) general population, where all observed data were used in the simulation; (2) reference population, where data were filtered in order to simulate only scenarios with...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Consumption; Heat stress; Modelling; Precision feeding; Swine.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162018000400296

Assessing biomass based on canopy height profiles using airborne laser scanning data in eucalypt plantations
Provedor de dados: 63
Autores: Silva,André Gracioso Peres; Görgens,Eric Bastos; Campoe,Otávio Camargo; Alvares,Clayton Alcarde; Stape,José Luiz; Rodriguez,Luiz Carlos Estraviz.
This study aimed to map the stem biomass of an even-aged eucalyptus plantation in southeastern Brazil based on canopy height profile (CHPs) statistics using wall-to-wall discrete return airborne laser scanning (ALS), and compare the results with alternative maps generated by ordinary kriging interpolation from field-derived measurements. The assessment of stem biomass with ALS data was carried out using regression analysis methods. Initially, CHPs were determined to express the distribution of laser point heights in the ALS cloud for each sample plot. The probability density function (pdf) used was the Weibull distribution, with two parameters that in a secondary task, were used as explanatory variables to model stem biomass. ALS metrics such as height...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: LiDAR; Basal area; Biometric model; Forest inventory; Fast-growing plantations.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162015000600504

Efeito da aplicação de etileno no pH, acidez, índice refratométrico e açúcares totais de frutos de manga, colhidos em estágio pré-climatérico
Provedor de dados: 63
Autores: Coneglian,R.C.C.; Rodrigues,J.D.; Brasil,O.G.
Este trabalho teve como objetivo o estudo da ação do etileno no amadurecimento de frutos de manga, tentando contribuir para o conhecimento da fisiologia do amadurecimento destes frutos. Foram utilizadas mangas (Mangifera indica L.), variedade Keitt, colhidas em estágio pré-climatérico. Estes frutos receberam tratamento com ethrel (500 e 1.000 ppm, com exceção da testemunha) e foram submetidos às seguintes determinações: pH, acidez, índice refratométrico e açúcares totais. A análise e interpretação dos resultados mostrou a inexistência de diferença estatística entre esses 3 tratamentos, indicando que a aplicação de ethrel não trouxe nenhuma vantagem na melhoria de qualidade dos frutos.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Manga; Ethrel. maturação.
Ano: 1993
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161993000200004

Meiotic behavior of interspecific hybrids between artificially tetraploidized sexual Brachiaria ruziziensis and tetraploid apomictic B. brizantha (Poaceae)
Provedor de dados: 63
Autores: Felismino,Mariana Ferrari; Pagliarini,Maria Suely; Valle,Cacilda Borges do.
The meiotic behavior of four interspecific promising hybrids was evaluated by conventional cytological methods. The female genitors were two artificially tetraploidized sexual accessions of B. ruziziensis (R41 and R44, 2n = 4χ = 36), which were crossed to an agronomically superior natural tetraploid apomictic genotype of B. brizantha (B140 - BRA003395). Three of them (HBGC313, HBGC 315, and HBGC324) were sexual and one (HBGC325) apomictic. Analyses of some cells in diakinesis revealed multivalent chromosome configurations, suggesting that genetic recombination and introgression of some genes could be present. The four hybrids had different types of meiotic abnormalities at various frequencies. Abnormalities related to irregular chromosome segregation due...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brachiaria; Brazil; Cytogenetics; Forage grasses; Meiosis.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000200010

Anatomia de ápices radiculares de feijão cv. carioca submetidos a níveis de boro em solução nutritiva
Provedor de dados: 63
Autores: Moraes-Dallaqua,Marina Aparecida; Beltrati,Celia Massa; Rodrigues,João Domingos.
Foram estudadas as alterações anatômicas em ápices radiculares do feijoeiro (Phaseolus vulgaris L. cv. Carioca), quando submetidos a diferentes níveis de boro em solução nutritiva. Através de um experimento inteiramente casualizado, foram realizados três tratamentos como se segue: T1 0,50 mg L-1 de boro (testemunha); T2 0,25 mg L-1 de boro (nível intermediário); T0 omisso em boro; sendo feitas amostragens em três estágios sucessivos de desenvolvimento da planta, no decorrer de seu ciclo. As alterações foram avaliadas efetuando-se secções longitudinais de ápices radiculares, sendo analisados comparativamente por meio de estudo cito-histológico com o emprego de microscópio de luz. Considerando como testemunha as plantas submetidas ao nível de 0,50 mg L-1 de...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phaseolus vulgaris; Anatomia; Nutrição mineral; Raiz.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000300009

ABSORÇÃO E EXTRAÇÃO DE ALGUNS NUTRIENTES PELA CULTIVAR 'GUAJARINA' DE PIMENTA-DO-REINO
Provedor de dados: 63
Autores: Veloso,Carlos Alberto Costa; Carvalho,Eduardo Jorge Maklouf.
O potencial econômico da cultura da pimenta do reino e a necessidade real de pesquisas que sustentem a sua exploração levaram a elaboração deste trabalho que teve por objetivo determinar a concentração e a distribuição dos nutrientes N, P, K, Ca e Mg, nas diversas partes da planta. O experimento foi conduzido em Belém, PA, em solo classificado como Latossolo Amarelo, textura média, com as seguintes características químicas: pH em H2O = 4,5; M.O = 17,5 g kg-1; P= 2,0 mg dm-3 e os cátions trocáveis, em mmolc.dm-3, K = 0,48; Ca2+= 4,0; Mg2+ =2,0; Al3+ = 13,0. As amostras foram constituídas de um grupo de seis plantas da cultivar Guajarina, coletadas aos 28 meses de idade, na época da produção. Os resultados obtidos mostraram que os nutrientes extraídos pela...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Piper nigrum; Nutrição mineral; Macronutrientes; Extração de nutrientes.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000200026

Growth of marandu palisadegrass subjected to strategies of intermittent stocking
Provedor de dados: 63
Autores: Giacomini,Alessandra Aparecida; Silva,Sila Carneiro da; Sarmento,Daniel Oliveira de Lucena; Zeferino,Cauê Varesqui; Souza Júnior,Salim Jacaúna; Trindade,Júlio Kuhn da; Guarda,Vítor del'Alamo; Nascimento Júnior,Domicio do.
Grazing strategies alter sward leaf area patterns of growth, affecting herbage accumulation and utilisation. The objective of this experiment was to evaluate the growth of marandu palisadegrass (Brachiaria brizantha cv. Marandu) swards subjected to strategies of intermittent stocking. The experiment was carried out in Piracicaba, São Paulo, Brazil, from October/2004 to September/2005. Swards were grazed at 95 and 100% canopy light interception (LI) to post-grazing heights of 10 and 15 cm, following a 2 × 2 factorial arrangement with four replications in a randomised complete block design. The response variables evaluated were: crop growth rate, relative growth rate, net assimilation rate, leaf area ratio and leaf weight ratio. In early and late spring, the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brachiaria brizantha; Canopy light interception; Regrowth; Grazing management.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000600003

Trifoliata hybrids rootstocks for 'Lane Late' navel orange in Spain
Provedor de dados: 63
Autores: Legua,Pilar; Bellver,Ricardo; Forner,Juan Bautista; Forner-Giner,Maria Angeles.
Carrizo citrange [Citrus sinensis (L.) Osb. × Poncirus trifoliata (L.) Raf.] and Cleopatra mandarin (C. reshni Hort. ex Tan.) are the most important rootstocks used in Spain, but they are problematic and it is necessary to search for new rootstocks with better all-round performance. The performance of 'Lane Late' navel orange [Citrus sinensis (L.) Osb] on ten rootstocks was determined in the South of the province of Alicante (Spain). They are Carrizo citrange, Cleopatra mandarin and eight new hybrids obtained at the Instituto Valenciano de Investigaciones Agrarias in Valencia (Spain): 020324 [Troyer citrange (C. sinensis × P. trifoliata) × Cleopatra mandarin], Forner-Alcaide 418 (F&amp;A 418) [Troyer citrange × common mandarin (C. deliciosa Ten.)],...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Citrus rootstock; Fruit quality; Tree size; Yield.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000500006

Evolução e mapeamento do uso da terra, através de imagens aerofotogramétricas e orbitais em Santa Bárbara D'Oeste (SP)
Provedor de dados: 63
Autores: Borges,M.H.; Pfeifer,R.M.; Demattê,J.A.M.
Em Santa Bárbara D'Oeste,SP, foram realizados dois mapeamentos do uso da terra em área de 14.625 ha. No primeiro utilizou-se fotografias aéreas verticais pancromáticas (data de 25/6/78), na escala 1:35.000, e no segundo utilizou-se imagens orbitais do satélite LANDSAT-5 com sensor "Thematic Mapper" (data de 12/8/91), escala 1: 100.000, nas bandas 3, 4 e 5 e composição colorida 3/4/5. Para auxiliar a confecção desses mapas, obteve-se chaves de interpretação, tanto para as aerofotos como para as imagens orbitais. As fotografias aéreas proporcionaram um maior nível de detalhamento na identificação do uso da terra. A banda 3 e a composição colorida 3/4/5 foram as mais eficientes entre as imagens orbitais. Entre 1978 e 1991, a área de ocorrência de...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mapeamento; Uso da terra; Fotografía aérea; Imagens orbitais.
Ano: 1993
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161993000300008

EFEITOS DO MOLIBDÊNIO E DA CALAGEM NO CRESCIMENTO DA COUVE - FLOR
Provedor de dados: 63
Autores: Mello,Simone da Costa; Minami,Keigo.
Conduziu-se um experimento num Podzólico Vermelho-Amarelo no período de 14/10/93 a 27/01/94 em Piracicaba (SP), tendo por objetivo estudar os efeitos da aplicação de molibdênio via sementes e da calagem sobre o crescimento e o desenvolvimento da couve-flor cv. Shiromaru II. O delineamento experimental foi em blocos casualizados, com dois fatores: calagem (sem e com aplicação de 1,5 t/ha de calcário) e doses de molibdênio via sementes (0, 13,5; 27 e 54 g Mo/kg de sementes), no esquema em faixas, com 4 repetições. Avaliou-se o número de folhas por planta, a altura de plantas (cm), o peso médio de cabeças (g/cabeça) e a produção de cabeças (t/ha). Houve diferença significativa somente com respeito a calagem, tratamento em que o peso médio de cabeças (640,7 g)...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Couve-flor; Molibdênio; Molibdato de amônio; Calcário.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000100031

Inferences on the effects of selection for feed conversion over meat quality traits in broiler
Provedor de dados: 63
Autores: Paiva,José Teodoro de; Mourão,Gerson Barreto; Ferraz,José Bento Sterman; Mattos,Elisângela Chicaroni; Michelan Filho,Tércio; Campos,Bárbara Machado; Eler,Joanir Pereira; Gaya,Leila de Genova.
ABSTRACT: The intense selection process for economic traits conducted by the poultry breeding programs has been caused several changes in broiler meat quality. A database belonging to a selection program of a broiler male line was used to estimate heritability and genetic correlations for feed conversion ratio and meat quality traits, which were: initial and final pH, lightness, drip loss, thawing loss and shear force. Two-trait analyses were performed and the components of co(variance) and genetic parameters were determined using the Bayesian approach and the GIBBS3F90 software. The heritability estimate found for feed conversion ratio (0.52) showed high influence of direct additive genetic effects on the expression of this trait; therefore, this trait is...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bayesian inference; Animal breeding; Genetic correlation; Indirect selection.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162018000200129

Water use and grain yield response of rainfed soybean to tillage-mulch practices in southeastern Nigeria
Provedor de dados: 63
Autores: Obalum,Sunday Ewele; Igwe,Charles Arizechukwu; Obi,Martin Eze; Wakatsuki,Toshiyuki.
Despite the agronomic, economic and food values of soybean (Glycine max L. Merrill), there is still dearth of information on the tillage need and the implications of surface mulch for the crop in the eastern part of the forest-savanna transition zone of Nigeria. This study was therefore carried out on a sandy loam Ultisol at Nsukka with a sub-humid climate, during 2006 and 2007 cropping seasons. Our objective was to devise an appropriate tillage method for the crop from evaluated effects of no-till (NT), conventional tillage (CT) and mulch on selected key agronomic indices. Each of the NT and the CT was either unmulched (U) or mulched (M) in a split-plot, giving four treatments/tillage methods (NTU, NTM, CTU and CTM) randomized in four blocks. Rainfall was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Tillage system; Surface mulch; Soil moisture; Soybean grain yield; Water use efficiency.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000500007

Fermentation and epiphytic microflora dynamics in sugar cane silage
Provedor de dados: 63
Autores: Pedroso,André de Faria; Nussio,Luiz Gustavo; Paziani,Solidete de Fátima; Loures,Daniele Rebouças Santana; Igarasi,Mauricio Scoton; Coelho,Rodrigo Michelini; Packer,Irineu Humberto; Horii,Jorge; Gomes,Luiz Humberto.
Sugar cane silages are characterized by extensive yeast activity, alcohol production and great dry matter - DM - losses. Better knowledge of the fermentation process is fundamental to the development of efficient ensilage techniques for this forage. This study evaluates temporal changes in chemical composition, DM losses and epiphytic microflora in sugar cane silage. Mature sugar cane, variety RB835486 (12 months of vegetative growth), was hand harvested, processed in a stationary chopper and ensiled in 20-L plastic buckets provided with valves for gas release and a device for effluent collection. Laboratory silos were kept at ambient temperature and sampled after ½, 1, 2, 3, 7, 15, 45, 90, 120 and 180 days. Ethanol concentration reached 6.4% in DM after...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ethanol; Water soluble carbohydrates; Losses; Yeasts; Bacteria.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000500003

Biological aspects of the beetle Delphastus davidsoni fed with whitefly eggs laid on tomato genotypes
Provedor de dados: 63
Autores: Oriani,Maria Auxiliadora de Godoy; Vendramim,José Djair.
Many plant breeding programs have incorporated plant resistance characteristics without considering how this resistance may affect the natural enemies of plant pests. We evaluated the biological aspects of Delphastus davidsoni (Gordon) fed with Bemisia tabaci B biotype eggs laid on tomato genotypes with different trichome densities and types. On LA1335 and NAV1062, the development periods were 21 days, and the larval mortality rates were 46.7 % and 28.9 %, respectively; on IAC294, the development period was 26 days, and the mortality rate 88.9 %. None of the larvae completed development when fed with whitefly eggs laid on PI134418. Most of the deaths took place in the second instar stage because the larvae became trapped in the glandular trichomes; similar...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Solanum lycopersicum; Lady beetle; Plant resistance; Trichomes; Tritrophic interaction.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162014000500003

Yield and fruit quality of peach scion by using rootstocks propagated by air layering and seed
Provedor de dados: 63
Autores: Picolotto,Luciano; Fachinello,José Carlos; Bianchi,Valmor João; Manica-Berto,Roberta; Pasa,Mateus da Silveira; Schmitz,Juliano Dutra.
In rootstock propagation, several methods can be used; however few practices are adopted due to the lack of information about the behavior of stionic combinations at field. The work aimed to compare the propagation method by air layering with the traditional propagation system by seeds using the scion peach [Prunus persica (L.) Batsch] cultivar Granada. The following variables were measured: yield, fruit weight and size, skin color, flesh firmness, total soluble solids content (TSS) and titatrable acidity (TA), TSS/TA ratio, total phenols, trunk diameter and pruning mass. Yield, total phenols and titatrable acidity were higher when using the air layering propagation. There was no difference between propagation methods regarding color and diameter of fruit,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Prunus persica (L.) Batsch; Plant propagation; Rootstocks; Yield and fruit quality.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000600005

Adubação e inseticidas no controle de Empoasca kraemeri e Bemisia tabaci, em cultivares de feijoeiro semeados no inverno
Provedor de dados: 63
Autores: Boiça Jr.,Arlindo Leal; Santos,Terezinha Monteiro dos; Muçouçah,Marcus Juabre.
Vários fatores influenciam a produtividade da cultura do feijoeiro, dentre estes podem ser citados as pragas, merecendo destaque, a cigarrinha verde, Empoasca kraemeri Ross &amp;amp; Moore (Hemiptera: Cicadellidae) e principalmente a mosca branca, Bemisia tabaci (Gennadius) (Hemiptera: Aleyrodidae), que prejudica o feijoeiro pela transmissão do vírus do mosaico dourado. Este trabalho avalia o efeito de cultivares de feijoeiro, adubação e inseticidas nas populações de E. kraemeri e B. tabaci na época de semeadura "de inverno". Os genótipos utilizados foram IAPAR MD-806, IAPAR MD-808, IAC-Carioca e Bolinha. Avaliaram-se, dos 7 aos 56 dias após emergência das plantas, o número de ninfas e adultos de cigarrinha verde e mosca branca, percentual de ataque de...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Insecta; Mosca branca; Cigarrinha; Feijão.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000400007

Mapping a hydrophysical soil property through a comparative analysis of local and global scale approximations
Provedor de dados: 63
Autores: Araujo-Carrillo,Gustavo Alfonso; Varón-Ramirez,Viviana Marcela; Gómez-Latorre,Douglas Andrés; Estupiñan-Casallas,Jhon Mauricio; Rodríguez-Roa,Andrea Onelia; Deantonio-Florido,Leidy Yibeth; Martínez-Maldonado,Fabio Ernesto.
ABSTRACT: Current available soil information allows building baselines to improve research, such as sustainable resource management; however, its use requires analysis of accuracy and precision that describes specific variables on local and global scales. Therefore, this study evaluated differences in the spatial distribution of water retention capacity (WRC) of the soil at a depth of 0.3 m, calculated from local general soil surveys and the global gridded soil information system (SoilGrids), using detailed or semi-detailed soil surveys as a reference, in two regions of Colombia (A and B). The qualitative and statistical analyses evaluated differences in WRC surfaces generated by the information sources. Neither information sources described WRC...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: SoilGrids; Digital soil mapping; General soil study; Water retention capacity.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000201401

Background levels of some trace elements in weathered soils from the Brazilian Northern region
Provedor de dados: 63
Autores: Fadigas,Francisco Souza; Amaral Sobrinho,Nelson Moura Brasil do; Anjos,Lucia Helena Cunha dos; Mazur,Nelson.
Soils formed from the Barreiras Group sediments, located mainly along the coast of Brazil Northern and Northeastern regions, generally present low concentrations of iron oxides and total organic carbon, high quantities of quartz in the sand fraction, and kaolinitic clay mineralogy. The objective of the present study was to quantify the pseudo total concentrations of Cd, Co, Cu, Cr, Mn, Ni, Zn and Fe in Xhantic Udox and Xhantic Udult soils derived from these sediments. The reference sites were covered by native vegetation and located in the States of Pará and Amapá, Brazil. Multiple linear regression analysis was applied to determine correlations between soil parameters and the levels of these metals. The best correlation was obtained between Fe, Mn, clay,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Udox; Udult; Heavy metals; Metal soil estimation; Multiple linear regression.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000100008

Identification and validation of novel EST-SSR markers in olives
Provedor de dados: 63
Autores: Arbeiter,Alenka Baruca; Hladnik,Matjaž; Jakše,Jernej; Bandelj,Dunja.
ABSTRACT: The olive (Olea europaea L.) is a leading oil crop in the Mediterranean area. Limited information on the inheritance of agronomic significant traits hinders progress in olive breeding programs, which encourages the development of markers linked to the traits. In this study, we report on the development of 46 olive simple sequence repeat (SSR) markers, obtained from 577,025 expressed sequence tags (ESTs) in developing olive fruits generated in the framework of the Slovenian national olive transcriptome project. Sequences were de novo assembled into 98,924 unigenes, which were then used as a source for microsatellites searching. We identified 923 unigenes that contained 984 SSRs among which dinucleotide SSRs (36 %) were the most abundant, followed...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Expressed sequence tags; Microsatellites; Genic markers; Genetic diversity; Functional annotation.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162017000300215

Phytoextraction: a review on enhanced metal availability and plant accumulation
Provedor de dados: 63
Autores: Nascimento,Clístenes Williams Araújo do; Xing,Baoshan.
Phytoextraction has emerged as a novel approach to clean up metal-polluted soils in which plants are used to transfer toxic metals from soils to shoots. This review provides a synthesis of current knowledge on phytoextraction of metals from soils and their accumulation in plants. The objective is to integrate soil-related (root exudates and chemical amendments) and biological advances to suggest research needs and future directions. As far as can be deduced from the literature, it will be some time before phytoextraction may be established as a commercial technology. For chemically-assisted phytoextraction, research has not shown easily biodegradable compounds to overcome the risks associated with the use of EDTA for poorly available metals in soils. On...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: EDTA; Phytoremediation; Heavy metals; Organic acids.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000300014

Symbiotic efficiency and genetic characteristics of Bradyrhizobium sp. strain UFSM LA 1.3 isolated from Lupinus albescens (H. et Arn)
Provedor de dados: 63
Autores: Stroschein,Marcos Roberto Dobler; Eltz,Flávio Luiz Foletto; Antoniolli,Zaida Inês; Lupatini,Manoeli; Vargas,Luciano Kaiser; Giongo,Adriana; Pontelli,Mateus Padoin.
Legume species belonging to the genus Lupinus are annual herb plants. The majority of them are indigenous to the Americas. They are known for nitrogen-fixing symbioses with soil bacteria collectively called rhizobia. The aim of this study was to characterize a rhizobium strain isolated from Lupinus albescens using phenotypic, symbiotic and molecular approaches. Strain UFSM LA 1.3 was tested in vitro according to several parameters: colony size, color and growing rate; acid or alkaline reaction in yeast mannitol media supplemented with bromothymol blue; gum production. Molecular characterization was evaluated by PCR technique using primers BOX A1-R and sequence analysis of the 16S-23S rDNA intergenic region (ITS). ITS sequencing fragments showed genetic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lupin; Rhizobia; Genotypic approaches.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000600012

CH4 and N2O fluxes from planted forests and native Cerrado ecosystems in Brazil
Provedor de dados: 63
Autores: Oliveira,Alexsandra Duarte de; Ribeiro,Fabiana Piontekowski; Ferreira,Eloisa Aparecida Belleza; Malaquias,Juaci Vitoria; Gatto,Alcides; Zuim,Diana Regazzi; Pinheiro,Luciano de Almeida; Pulrolnik,Karina; Soares,João Paulo Guimarães; Carvalho,Arminda Moreira de.
ABSTRACT Forest soils are N2O sources and commonly act as CH4 sinks. This study evaluated the dynamics of the CH4 and N2O fluxes of soils under Eucalyptus plantations and native Cerrado vegetation, as well as possible interactions between environmental factors and fluxes. The study was carried out in the Distrito Federal, Brazil, during 26 months, in three areas: in two stands of the hybrid Eucalyptus urophylla × Eucalyptus grandis, planted in 2011 (E1), and in 2009 (E2) and native Cerrado vegetation (CE). Measurements to determine the fluxes in a closed static chamber were carried out from Oct 2013 to Nov 2015. Soil and climate factors were monitored. During the study period, the mean CH4 fluxes were –22.48, –8.38 and –1.31 μg CH4 m–2 h–1 and the mean N2O...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Eucalyptus; Greenhouse gases; Forest stand age; Savanna.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000100302

Earthworm populations sampled using collection methods in atlantic forests with Araucaria angustifolia
Provedor de dados: 63
Autores: Baretta,Dilmar; Brown,George Gardner; James,Samuel Wooster; Cardoso,Elke Jurandy Bran Nogueira.
Araucaria angustifolia, also known as the Paraná Pine is an endangered tree species in Brazil and little is known of the diversity of soil invertebrates inhabiting these forests. Therefore, the present study was set up to evaluate the biomass and diversity of earthworms in natural and reforested Araucaria plots, impacted or not by fire, and to identify the most efficient earthworm collection method. Four study areas included: native forest with Araucaria (NF); Araucaria reforestation (R); Araucaria reforestation submitted to an accidental fire (RF); and native grass pasture with native Araucaria and submitted to an intense accidental fire (NPF). Five soil samples containing the earthworm community were taken in a 0.3 ha area in each of the forest sites,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Oligochaeta; Biodiversity; Burning; Native and exotic species; Bioindicators.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000400009

Crescimento do milho em função da saturação por bases e da adubação potássica
Provedor de dados: 63
Autores: Andreotti,Marcelo; Rodrigues,João Domingos; Crusciol,Carlos Alexandre Costa; Souza,Euclides Caxambu Alexandrino de; Büll,Leonardo Theodoro.
Os teores de Ca, Mg e K no solo interferem no crescimento e na produção das culturas. No entanto, a relação entre esses nutrientes que proporciona o desenvolvimento adequado das plantas varia entre as espécies vegetais. O presente teve por objetivo estudar o desenvolvimento do milho em função da saturação do solo por bases e adubação potássica. O delineamento experimental foi inteiramente casualizado, com quatro repetições, em esquema fatorial 3x2x4, constituindo-se de três solos (Neossolo Quartzarênico, Latossolo Vermelho e Latossolo Bruno), dois valores de saturação por bases (40 e 70 %) e quatro doses de potássio no solo (0, 60, 120 e 240 mg kg-1). O experimento foi conduzido em casa-de-vegetação, utilizando-se o milho cv. Zêneca 8392 com uma planta por...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Calagem; Comprimento de entrenós; Altura; Número de folhas.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000100022

Aggressiveness and physiological specialization of Septoria tritici Rob. isolates
Provedor de dados: 63
Autores: Gieco,Jorge Omar; Dubcovsky,Jorge; Camargo,Luis Eduardo Aranha.
Pathogenicity tests verifying the behavior of Septoria tritici isolates should be considered as a priority in the selection of resistant wheat materials to this pathogen, since the aggressiveness of each isolate can vary significantly, causing problems in the evaluation and selection of resistant genotypes. The objective of this work was to determine whether physiologic specialization exists among Argentinean and American Septoria tritici isolates, through the analysis of their pathogenicity on cultivars and lines of bread wheat (Triticum aestivum L.). The experiments were carried out in Castelar-Argentina and in Davis-USA. In Castelar, a split plot design (n = 4) was used. The cultivars or lines were randomized in the plots and the isolates in the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mycosphaerella graminicola; Triticum aestivum; Leaf blotch; Vertical resistance; Horizontal resistance.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000400010

Colonization of Greek olive cultivars' root system by arbuscular mycorrhiza fungus: root morphology, growth, and mineral nutrition of olive plants
Provedor de dados: 63
Autores: Chatzistathis,Theocharis; Orfanoudakis,Michail; Alifragis,Dimitrios; Therios,Ioannis.
Rooted leafy cuttings of three Greek olive (Olea europaea L.) cultivars (Koroneiki, Kothreiki and Chondrolia Chalkidikis) were grown for six months in three soil types, in an experimental greenhouse, in order to investigate: i) if their root system was colonized by arbuscular mycorrhiza fungus (AMF) genus and, ii) if genotypic differences concerning growth and mineral nutrition of olive plants existed. Gigaspora sp. colonized the root system of the three cultivars studied, while Glomus sp. colonized only the root system of 'Koroneiki'. Furthermore, in most cases root colonization by AMF differed among cultivars and soil types. The maximum root colonization, in all soils, was found in 'Chondrolia Chalkidikis'. In the three soils studied, the ratio shoot dry...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: 'Chondrolia Chalkidikis'; 'Koroneiki'; 'Kothreiki'; Root colonization; Soil type.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162013000300007

Yield of varieties of Cucurbita pepo preimmunized with mild strains of Papaya ringspot virus - type W and Zucchini yellow mosaic virus
Provedor de dados: 63
Autores: Bonilha,Estela; Gioria,Ricardo; Kobori,Rômulo Fujito; Vecchia,Paulo Tarcísio Della; Piedade,Sônia Maria de Stefano; Rezende,Jorge Alberto Marques.
Papaya ringspot virus - type W (PRSV-W) and Zucchini yellow mosaic virus (ZYMV) are the most prevalent viruses in cucurbit crops in Brazil and responsible for frequent yield losses. Diseases caused by these viruses are difficult to control. The objective of this work was to evaluate the effects of mild strains PRSV-W-1 and ZYMV-M on the yield of Cucurbita pepo L. cvs. Samira, Novita Plus, AF 2847, and Yasmin, under plastic greenhouse and field conditions. Plants infected with ZYMV-M and grown in a plastic greenhouse did not exhibit typical leaf symptoms or significant alterations in quantitative and qualitative fruit yield. However, when infected with PRSV-W-1, or PRSV-W-1 + ZYMV-M, the plants exhibited severe leaf mosaic symptoms and reduced fruit...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Control; Potyvirus; Cross protection; Cucurbitaceae.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000300019

EFICIÊNCIA DO HERBICIDA OXADIARGYL NO CONTROLE DE PLANTAS DANINHAS NA CULTURA DO ARROZ (Oryza sativa L.) IRRIGADO
Provedor de dados: 63
Autores: Dario,Geraldo José Aparecido; Gallo,Paulo Boller.
Visando avaliar a eficiência agronômica do herbicida oxadiargyl no controle de plantas daninhas ocorrentes na cultura do arroz (Oryza sativa L.) irrigado, semeado em solo drenado, instalou-se ensaio em condição de campo no município de Mococa, SP, em novembro de 1993. O produto foi aplicado em pré-emergência da cultura e das plantas daninhas, nas doses de 320, 400, 480 e 560 g/ha e como padrão utilizou-se duas formulações de oxadiazon, ambas em doses de 1.000 g./ha. Os resultados obtidos permitem concluir: o herbicida oxadiargyl é eficiente no controle da tiririca-do-brejo (Cyperus iria) nas quatro doses testadas e do capim-arroz (Echinochloa colonum) e capim-macho (Ischaemum rugosum) nas três maiores doses; o herbicida oxadiargyl causa leve...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Arroz irrigado; Herbicida; Plantas daninhas; Oxadiargyl.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000100006

Screening of Lycopersicon sp. accessions for resistance to Pepper yellow mosaic virus
Provedor de dados: 63
Autores: Juhász,Ana Cristina Pinto; Silva,Derly José Henriques da; Zerbini Júnior,Francisco Murilo; Soares,Bruno Oliveira; Aguilera,George Alberto Hial.
The tomato is a crop of great economical importance, however it is susceptible to a large number of pests and diseases, including viral disease for which the best control strategy is genetic resistance. The disease, caused by Pepper yellow mosaic virus (PepYMV) has become a recent problem. Consequently, the idea of this work was to screen 376 accessions of Lycopersicon sp. to find possible sources of resistance to PepYMV. Out of 355 accessions of L. esculentum inoculated with PepYMV, 52 did not express symptoms. However, the virus reached high concentration in the tissues as measured by indirect ELISA, and therefore they were not considered as safe sources of resistance. Among 21 accessions of wild Lycopersicon species, one of L. hirsutum was shown to be...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lycopersicon hirsutum; Genetic resources; Viruses; Potyvirus.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000500014

Glyphosate sorption and desorption in soils with distinct phosphorus levels
Provedor de dados: 63
Autores: Prata,Fábio; Cardinali,Vanessa Camponez do Brasil; Lavorenti,Arquimedes; Tornisielo,Valdemar Luiz; Regitano,Jussara Borges.
The sorption of glyphosate by soils occurs due to the inner sphere complex formation with metals of soil oxides, which are related to the soil phosphate adsorption capacity. The aim of this study was to evaluate the effects of increasing rates of phosphorus on sorption and desorption of glyphosate in three soils with different mineralogical attributes. Soils were a Rhodic Kandiudalf, an Anionic Acrudox and a Typic Humaquept. Soil samples were amended with KH2PO4 at equivalent rates of 0; 1,000; 5,000; 20,000 and 50,000 kg ha-1 of P2O5, which are high from the agricultural point of view, but necessary in order to perform sorption and desorption studies. The experimental design consisted of a completely randomized factorial: 2 soils x 5 phosphorus rates and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Herbicide; Retention; Bound residue; Phosphate; Oxides.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000100026

Gamma radiation in papaya harvested at three stages of maturation
Provedor de dados: 63
Autores: Pimentel,Rodrigo Meirelles de Azevedo; Walder,Julio Marcos Melges.
Papaya is a fragile, perishable fruit, highly accepted worldwide. To keep the quality of papaya from harvest to the consumers, conservation techniques are often used; among them is the application of gamma irradiation. The objective of this work was to evaluate gamma irradiation in papayas harvested at three degrees of maturation, in order to increase shelf life. Papayas were harvested in perfect quality conditions and selected by skin coloration into three distinct degrees of maturation: maturation 0, or beginning of yellow coloration; maturation 1, yellow stripes more developed, and maturation 2, one third yellow. Half of them were irradiated with 0.75 kGy, while the other half became control treatment. They were analyzed in four periods of conservation,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Post-harvest; Food conservation; Gamma irradiation; Tropical fruits; Shelf life.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000200004

A simple method for DNA isolation from Xanthomonas spp.
Provedor de dados: 63
Autores: Gomes,Luiz Humberto; Duarte,Keila Maria Roncato; Andrino,Felipe Gabriel; Tavares,Flavio Cesar Almeida.
A simple DNA isolation method was developed with routine chemicals that yields high quality and integrity preparations when compared to some of the most well known protocols. The method described does not require the use of lysing enzymes, water bath and the DNA was obtained within 40 minutes The amount of nucleic acid extracted (measured in terms of absorbancy at 260 nm) from strains of Xanthomonas spp., Pseudomonas spp. and Erwinia spp. was two to five times higher than that of the most commonly used method.
Tipo: Info:eu-repo/semantics/report
Palavras-chave: DNA; Xanthomonas; RAPD.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000300028

Caracterização física de uma classe de solo do ecossistema do tabuleiro costeiro
Provedor de dados: 63
Autores: CINTRA,F.L.D.; LIBARDI,P.L.
Embora haja grande potencial dos tabuleiros costeiros do nordeste brasileiro para exploração agrícola, relacionado à topografia favorável à mecanização e proximidade de grandes centros consumidores, a má distribuição das chuvas, associada aos horizontes coesos situados próximos à superfície e presentes em muitas classes de solo deste ecossistema, promove, com freqüência, sérios problemas no suprimento de água para as plantas. Este trabalho foi realizado com o objetivo de avaliar a influência de algumas características físicas, especialmente das camadas coesas no desenvolvimento de citros, a fim de fornecer subsídios para a geração de tecnologias adaptadas a este ecossistema e capazes de permitir o suprimento adequado de água para as plantas pelo maior...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Camadas coesas; Citros; Déficit hídrico; Tabuleiro.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000300004

Poliaminas na embriogênese somática em cenoura (Daucus carota L.)
Provedor de dados: 63
Autores: Schons,J.; Brasil,O. G.
As poliaminas, putrescina (put), espermidina (spd) e espermina (spm) são amplamente distribuídas na natureza, desempenhando importante papel em vários eventos celulares. Considerando que as poliaminas estão envolvidas no processo embriogênico, torna-se importante conhecer as bases para estas alterações no metabolismo. O objetivo do presente trabalho foi observar os teores de poliaminas durante as diferentes fases da embriogênese somátka da cenoura. As análises foram realizadas, através da modificação do método de Flores e Galston a cada 96 horas durante 50 dias da cultura de células em suspensão. As células foram obtidas a partir de calos e inoculadas em meio de Murashige &amp;amp; Skoog (MS), modificado e acrescido de 0,2 mg/l de 2,4-D e 0,1 mg/l de...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Poliaminas; Embriogênese somática; Cenoura; Daucus carota.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000300020

Genetic association between longevity and linear type traits of Holstein cows
Provedor de dados: 63
Autores: Kern,Elisandra Lurdes; Cobuci,Jaime Araujo; Costa,Cláudio Napolis; McManus,Concepta Margaret; Braccini Neto,José.
Longevity is a desirable trait in the dairy industry because of its relationship to profitability. The aim of this study was to estimate genetic parameters for longevity measurements related to productive life, or life in the herd, and linear type traits of Brazilian Holstein cows born between the years 1990 and 2008. The (co) variance components were estimated by the restricted maximum likelihood method. The heritability for measurements of longevity and linear type traits ranged from 0.05 to 0.07 and 0.08 to 0.39, respectively. The genetic correlations between measurements of longevity and linear type traits ranged from -0.39 to 0.31. Direct selection for longevity does not necessarily lead to long-lived cows, due to low heritability. Indirect genetic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Genetic correlation; Mammary system; Productive life; Rear teat placement.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162015000300203

Macronutrient accumulation and partioning in fertigated sweet pepper plants
Provedor de dados: 63
Autores: Marcussi,Francisco Fernando Noronha; Villas Bôas,Roberto Lyra; Godoy,Leandro José Grava de; Goto,Rumy.
Information on nutrient demand during each growth stage is essential for efficient application of nutrients. A pot experiment was carried out with a Typic Hapludox under greenhouse conditions in Botucatu, SP, Brazil, aiming was to determine nutrient uptake and partition of sweet pepper plants, cultivar Elisa in randomized block design with four replications. The fertigation was simulated through 2-L PET bottles (neck down with a tube and a flow regulator at the end, simulating a drip irrigation system). Four plants per replication were collected at eight growth stages (0, 20, 40, 60, 80, 100, 120 and 140 days after the seedling transplant - DAT). The period of largest extraction of nutrients for the plant occurred from 120 to 140 DAT, which coincides with...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Capsicum annuum L.; Irrigation; Greenhouse; Growth.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000100011

Sod production and the effects of liquid organo-mineral fertilizers and thickness of sod
Provedor de dados: 63
Autores: Lima,Claudinei Paulo de; Backes,Clarice; Santos,Alessandro José Marques; Bôas,Roberto Lyra Villas; Fernandes,Dirceu Maximino; Godoy,Leandro José Grava de; Oliveira,Mauricio Roberto de.
ABSTRACT: Nitrogen fertilization and an appropriate cutting thickness can result in firmer sod that can be handled in less time with greater turfgrass regrowth during the subsequent cycle. This experiment was conducted on a sod production farm located in Capela do Alto, in the state of Sao Paulo, Brazil. The soil was a dystrophic Rhodic Hapludox (Oxisol) with a medium texture. The experiment had two statistical designs; the initial design was randomized blocks with seven treatments and four replicates. Treatments were five doses of liquid organo-mineral fertilizer (OMF) corresponding to 0, 100, 200, 300 and 400 kg ha−1 of nitrogen (N) with supplementation of phosphorous (P) and potassium (K) as well as two control treatments - one with 300 kg ha–1 of N as...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zoysia japonica Steud.; Nitrogen fertilization; Sod quality.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162018000400346

Erratum
Provedor de dados: 63
Tipo: Info:eu-repo/semantics/other
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000502001

Genetic control of viviparity in common bean
Provedor de dados: 63
Autores: Pereira,Laís Andrade; Ramalho,Magno Antonio Patto; Abreu,Ângela de Fátima Barbosa; Guilherme,Scheila Roberta.
ABSTRACT: In common bean (Phaseolus vulgaris) harvesting is carried out in the field. It is therefore necessary that cultivars be tolerant to viviparity, i.e., germination of grains still in the pods. Study of the percentage of germination of beans in the pods under laboratory conditions, where humidity content is high, has been proposed. Furthermore, under question is whether the thickness of the pod wall affects water uptake by the pods and, consequently, viviparity. Thus, the aim of the present study was to verify if there is variance among progenies for viviparity and if it is influenced by pod thickness. We assessed the parents, Pérola and ESAL 686, the F1, and a number of segregating generations in two crop seasons, in relation to the percentage of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phaseolus vulgaris; Plant breeding; Pre-harvest sprouting; Genetic components; Heritability.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162017000300208

ANÁLISE HIDRÁULICA DE HIDRO-EJETORES
Provedor de dados: 63
Autores: OLIVEIRA,E.F.; BOTREL,T.A.; FRIZZONE,J.A.; PAZ,V.P.S.
Os ejetores são dispositivos apropriados para aspirar e recalcar um fluído (líquido, gás ou vapor) ou uma mistura fluído-sólido, por aplicação prática do fenômeno de Venturi. Nem sempre, porém, se emprega o ejetor adequado para a realização desse trabalho, em virtude da escassez de informações e dados técnicos a respeito. A fim de contribuir para a solução desse problema, procurou-se avaliar o desempenho de aparelhos a jato acionados hidraulicamente. Para tal, conduziram-se ensaios com dois tipos de hidro-ejetores, disponíveis no mercado, com parâmetros característicos m=0,35 e m=0,52, respectivamente, alimentados por uma bomba centrífuga, buscando conhecer o volume de água arrastado, os rendimentos, a relação vazão de sucção/pressão de sucção, para as...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ejetor; Pressão de sucção; Rendimento.
Ano: 1996
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161996000200009

Manganese and zinc leaf application on common bean grown on a "Cerrado" soil
Provedor de dados: 63
Autores: Teixeira,Itamar Rosa; Borém,Aluízio; Araújo,Geraldo Antônio de Andrade; Fontes,Renildes Lúcio Ferreira.
The occurrence of micronutrient deficiencies, mainly of manganese (Mn) and zinc (Zn) in "cerrado" soils, has been increasing in several crops, including bean. Such a problem is caused by high rates of liming material applied entirely on the soil surface. In this study, the effects of the leaf application of Mn and Zn rates were evaluated. Three experiments were carried out: two in greenhouse and one under field conditions. The greenhouse experiments were set up using a randomized block design and a 5 x 5 factorial, with three replicates, consisting of five rates of Mn (0, 75, 150, 300, and 600 g ha-1) and five rates of Zn (0, 50, 100, 200, and 400 g ha-1) applied via leaves at the 25th day, or both alternatively parceled at 25 and 35 days after emergency...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phaseolus vulgaris; Yield; Mineral nutrition; Micronutrients.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000100013

Methods of soil organic carbon determination in Brazilian savannah soils
Provedor de dados: 63
Autores: Sato,Juliana Hiromi; Figueiredo,Cícero Célio de; Marchão,Robélio Leandro; Madari,Beáta Emöke; Benedito,Luiz Eduardo Celino; Busato,Jader Galba; Souza,Diego Mendes de.
Several methods exist for determining soil organic carbon, and each one has its own advantages and limitations. Consequently, a comparison of the experimental results obtained when these methods are employed is hampered, causing problems in the comparison of carbon stocks in soils. This study aimed at evaluating the analytical procedures used in the determination of carbon and their relationships with soil mineralogy and texture. Wet combustion methods, including Walkley-Black, Mebius and Colorimetric determination as well as dry combustion methods, such as Elemental and Gravimetric Analysis were used. Quantitative textural and mineralogical (kaolinite, goethite and gibbsite) analyses were also carried out. The wet digestion methods underestimated the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil organic matter; Wet combustion; Dry combustion.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162014000400007

Metabolizable protein supply according to the nrc (2001) for dairy cows grazing elephant grass
Provedor de dados: 63
Autores: Voltolini,Tadeu Vinhas; Santos,Flávio Augusto Portela; Martinez,Junio Cesar; Imaizumi,Hugo; Pires,Alexandre Vaz; Penati,Marco Antonio.
Tropical pastures fertilized with nitrogen may have high crude protein (CP) contents with high rumen degradability. High crude protein concentrates offered to cows grazing these pastures may increase feed costs without positive effects on their performance. The objectives of this trial were to evaluate the effects of increasing metabolizable protein (MP) supply beyond the NRC (2001) recommendations for mid lactating dairy cows grazing elephant grass pasture (Pennisetum purpureum Schum. cv. Napier) managed with high stocking rates. Three concentrates (6.3 kg DM-1 cow-1 day-1) were evaluated: control (17%CP) was adjusted in relation to MP according to the NRC (2001); the other two contained extra soybean meal, to increase the CP content to 21.2% (CP) and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Concentrates; Milk production; Protein content; Tropical pastures.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000200004

Long-life tomato cultivars growing under the hydroponic Nutrient Film Technique
Provedor de dados: 63
Autores: Gualberto,Ronan; Oliveira,Paulo Sérgio Rabelo de; Resende,Francisco Vilela.
Farmers are interested in hydroponic tomato cultivation because of the high demand of high quality products by the consumers. Three trials here carried out under greenhouse conditions in Marília, SP, Brazil, using the hydroponic nutrient film technique, in order to evaluate yield and quality of long-life salad tomato (Lycopersicon esculentum) varieties, during 1998 and 1999. Four varieties (Carmen, Diva, Graziela, and Vita) were tested using a randomized block design, with six replications. The variety x crop season interaction effect was significant, meaning that varieties have distinct performances during the different cropping seasons. The Vita variety presented commercial valid yield, with mean fruit weights higher than the other varieties.
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Lycopersicon esculentum; Hidroponic crops; Greenhouse; Fresh-market tomato.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000400027

Produção da tilápia vermelha da Flórida em tanques-rede
Provedor de dados: 63
Autores: Carneiro,Paulo Cesar Falanghe; Cyrino,Jóse Eurico Possebon; Castagnolli,Newton.
A produção de peixes em tanques-rede no Brasil tem aumentado nas últimas décadas. O baixo investimento inicial e o potencial hídrico representado pela enorme quantidade de água represada em nosso País têm atraído o interesse de empresários para essa atividade. O objetivo desse trabalho foi gerar informações sobre o efeito da densidade de estocagem no crescimento e produtividade da tilápia vermelha da Flórida criadas em tanques-rede. Foram instalados doze tanques-rede de 5 m3, numa represa de 1 ha, e estocados com 25, 50, 75 e 100 tilápias vermelhas da Flórida revertidas por m3. Os peixes foram alimentados com rações extrusadas comerciais contendo 32 e 28% PB por 253 dias. As temperaturas máxima, mínima e média da água foram 32,2, 16,0 e 23,9 C,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Densidade de estocagem; Tanque-rede; Tilápia vermelha.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000300023

Morphophysiological development of Tabeluia serratifolia Vahl Nich. seeds
Provedor de dados: 63
Autores: Carvalho,Maria Laene Moreira de; Nery,Marcela Carlota; Oliveira,Luciana Magda de; Hilhorst,Henk W. M.; Guimarães,Renato Mendes.
Tabebuia serratifolia is used for the reforestation of degraded areas. Despite protection by law for permanent preservation, the species is in danger of extinction due to improper exploitation. With the objective to aid preservation and long term storage of the species we evaluated morphophysiological alterations of T. serratifolia seeds during the maturation process in order to identify markers that can be used for harvesting and storage. Fruits were collected at anthesis and seven developmental stages from trees growing in Lavras, state of Minas Gerais, Brazil. At each harvest, fruits and seeds were evaluated for color and size, moisture content, dry matter, internal morphology (by X-ray analysis), germination parameters (in vitro and ex vitro), as well...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Forest seeds; Maturation; Seed quality; Preservation.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000600012

Plot size and experimental precision for sunflower production
Provedor de dados: 63
Autores: Lorentz,Leandro Homrich; Boligon,Alexandra Augusti; Storck,Lindolfo; Lúcio,Alessandro Dal'Col.
In order for sunflower cultivation to be economically sustainable, research should be based upon suitable experimental techniques. Since this kind of information is not readily available, the aim of this study was to estimate the seed production heterogeneity index and the optimal experimental plot size, and to verify experimental precision in sunflower experiments. Sunflower seed yield figures for plots of 1-meter rows (0.4 m spacing) were collected. The experiments were carried out in the 2004/05 and 2005/06 growing seasons in a 1-ha area, by marking out 12 randomized blocks (12 uniformity trials) of two rows 48 plots long on land used for commercial production of sunflowers in Bossoroca, state of Rio Grande do Sul, Brazil. Plots of different sizes were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Helianthus annuus L; Experimental techniques; Number of replications; Experimental design.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000400005

Water extraction and implications on soil moisture sensor placement in the root zone of banana
Provedor de dados: 63
Autores: Silva,Alisson Jadavi Pereira da; Coelho,Eugênio Ferreira; Coelho Filho,Maurício Antônio; Souza,José Leonaldo de.
ABSTRACT: The knowledge on spatial and temporal variations of soil water storage in the root zone of crops is essential to guide the studies to determine soil water balance, verify the effective zone of water extraction in the soil and indicate the correct region for the management of water, fertilizers and pesticides. The objectives of this study were: (i) to indicate the zones of highest root activity for banana in different development stages; (ii) to determine, inside the zone of highest root activity, the adequate position for the installation of soil moisture sensors. A 5.0 m3 drainage lysimeter was installed in the center of an experimental area of 320 m2. Water extraction was quantified inside the lysimeter using a 72 TDR probe. The concept of time...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil water storage; Irrigation management; Water balance.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162018000200095

Efficiency of maize cultivars for zinc uptake and use
Provedor de dados: 63
Autores: Furlani,Ângela Maria Cangiani; Furlani,Pedro Roberto; Meda,Anderson Rotter; Duarte,Aildson Pereira.
Zinc deficiency usually occurs in maize grown in Brazilian acidic soils. The aim of this study was to evaluate commercial maize cultivars for their Zn uptake and utilization efficiency. A greenhouse experiment using nutrient solution with young plants was carried out at Campinas, State of São Paulo, Brazil, in 2002. Treatments consisted of: 0.0; 0.1; 0.2; 0.4 and 0.8 mg L-1 Zn in the main plots and 24 commercial maize cultivars in the subplots, in a randomized complete block design. Zn concentration in shoot dry matter (SDM) ranged from 28.4 to 41.6 mg kg-1 among cultivars, clearly indicating a dilution effect, since a negative relation between SDM and plant height was shown. Total Zn-shoot content was a good parameter to discriminate cultivars, once...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays L.; Zn-efficiency; Zn uptake; Zn-deficiency; Commercial cultivars.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000300010

Assessment of sugarcane harvesting residue effects on soil spectral behavior
Provedor de dados: 63
Autores: Demattê,José A. M.; Terra,Fabrício da Silva; Otto,Rafael; Toma,Raul Shiso; Pereira,Luiz Henrique; Nascimento,Alexandre Ferreira do; Bortoletto,Marco Antonio Melo.
ABSTRACT When the harvesting of sugarcane involves a mechanized process, plant residues remain on the soil surface, which makes proximal and remote sensing difficult to monitor. This study aimed to evaluate, under laboratory conditions, differences in the soil spectral behavior of surface layers Quartzipsamment and Hapludox soil classes due to increasing levels of sugarcane’s dry (DL) and green (GL) leaf cover on the soil. Soil cover was quantified by supervised classification of the digital images (photography) taken of the treatments. The spectral reflectance of the samples was obtained using the FieldSpec Pro (350 to 2500 nm). TM-Landsat bands were simulated and the Normalized Difference Vegetation Index (NDVI) and soil line were also determined. Soil...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: TM-Landsat; NDVI; Soil remote sensing; Soil proximal sensing; Soil line.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000200159

Antioxidant system of ginseng under stress by cadmium
Provedor de dados: 63
Autores: Marques,Teresa Cristina Lara Lanza de Sá e Melo; Soares,Angela Maria.
Toxic levels of Cd can cause protein denaturation and oxidative stress, which result in membrane damage, enzimatic activity changes and other metabolic damage. Some plants may show alteration in the activity of their antioxidant enzymes as a heavy metal tolerance mechanism. This study aims at evaluating the role of enzymes of the antioxidant system in adaptive responses of the accumulator P. glomerata species to levels of cadmium (Cd). Plants were cultivated in nutrient solutions containing concentrations of Cd in the form of CdSO4 (0, 45 and 90 µmol L-1), for 20 d. Cd concentrations and yields of root and shoot dry matter were determined at the end of the experiment. Malondialdehyde (MDA) production and the activities of antioxidant enzymes were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antioxidant enzymes; Oxidative stress; Tolerance; Cadmium toxicity.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000400014

Soil respiration dynamics in forage-based and cereal-based cropping systems in central Italy
Provedor de dados: 63
Autores: Francioni,Matteo; Lai,Roberto; D'Ottavio,Paride; Trozzo,Laura; Kishimoto-Mo,Ayaka W.; Budimir,Katarina; Baldoni,Nora; Toderi,Marco.
ABSTRACT: Studies that have investigated soil carbon dynamics under Mediterranean conditions are scarce and fragmented and contrasting results have often been reported. This study aimed to fill some gaps in our knowledge by: (i) determining annual dynamics of total (RS) and heterotrophic (RH) soil respiration; (ii) estimating annual cumulative RS and RH; and (iii) investigating the relationships between RS and RH and soil temperature and water content. The study was carried out in central Italy, for a plain and a hilly site, with the focus on two main cropping systems: an alfalfa-based forage system and a wheat-based rotation system. RS and RH showed different dynamics, with spatial and temporal variability across these sites. Estimated annual cumulative...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mediterranean; Alfalfa; Greenhouse gasses; Soil carbon stock; Wheat.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000301400

Electrical conductivity of the seed soaking solution and soybean seedling emergence
Provedor de dados: 63
Autores: Vieira,Roberval Daiton; Scappa Neto,Angelo; Bittencourt,Sonia Regina Mudrovitsch de; Panobianco,Maristela.
Vigor of soybean [Glycine max (L.) Merrill] seeds can be evaluated by measuring the electrical conductivity (EC) of the seed soaking solution, which has shown a satisfactory relationship with field seedling emergence, but has not had aproper definition of range yet. This work studies the relationship between EC and soybean seedling emergence both in the field and laboratory conditions, using twenty two seed lots. Seed water content, standard germination and vigor (EC, accelerated aging and cold tests) were evaluated under laboratory conditions using -0.03; -0.20; -0.40 and -0.60 MPa matric potentials, and field seedling emergence was also observed. There was direct relationship between EC and field seedling emergence (FE). Under laboratory conditions, a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycine max; Vigor; Physiological quality; Water stress.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000200007

EFEITOS DAS APLICAÇÕES DE CÁLCIO E DE BORO NA OCORRÊNCIA DE PODRIDÃO APICAL  E PRODUÇÃO DE TOMATE EM ESTUFA
Provedor de dados: 63
Autores: PLESE,L.P.M.; TIRITAN,C.S.; YASSUDA,E.I.; PROCHNOW,L.I.; CORRENTE,J.E.; MELLO,S.C.
Com o objetivo de estudar os efeitos das aplicações de cálcio via foliar e de boro via solo na produção e ocorrência de podridão apical em tomate em estufa, conduziu-se um experimento no município de Regente Feijó, SP, com solo classificado como Podzólico Vermelho-Amarelo, fase arenosa. Os tratamentos consistiram de três doses de boro (0, 1 e 2 g cova-1) e três freqüências de aplicação foliar de cloreto de cálcio a 0,6% (sem aplicação, aplicação semanal e quinzenal). Os resultados obtidos sugeriram que a aplicação de 1 g cova-1 de boro e freqüência de aplicação quinzenal de CaCl2 a 0,6% e a aplicação semanal de CaCl2 a 0,6% na ausência de boro constituíram-se nas melhores opções no sentido de conciliar maior produtividade e menor número de frutos com...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cálcio; Boro; Tomate; Estufa; Podridão estilar.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000100023

Lodo de esgoto como fonte de macronutrientes para a cultura do sorgo granífero
Provedor de dados: 63
Autores: Oliveira,F.C.; Marques,M.O.; Bellingieri,P.A.; Perecin,D.
O presente trabalho foi realizado em condições de casa-de-vegetação com o objetivo de avaliar os efeitos da aplicação de doses de lodo de esgoto (equivalentes a 0, 5, 10 e 20 t/ha), complementadas ou não com nitrogênio e/ou potássio, sobre parâmetros de fertilidade do solo, absorção de macronutrientes e produção de matéria seca por plantas de sorgo granífero (Sorghum bicolor L. Moench.) cultivadas em Latossolo Vermelho Escuro. De maneira geral, foi possível observar que o lodo de esgoto, através de sua decomposição no solo, liberou nutrientes para as plantas, refletindo no aumento da produção de matéria seca. Entretanto, visando-se atender às necessidades da cultura, fez-se necessária a complementação com potássio.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lodo de esgoto; Macronutriente.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000200026

Soil mesofauna in consolidated land use systems: how management affects soil and litter invertebrates
Provedor de dados: 63
Autores: Zagatto,Maurício Rumenos Guidetti; Zanão Júnior,Luiz Antônio; Pereira,Arthur Prudêncio de Araújo; Estrada-Bonilla,German; Cardoso,Elke Jurandy Bran Nogueira.
ABSTRACT: Soil mesofauna consists of small invertebrates that live in the soil or litter and are sensitive to climatic conditions, management systems, plant cover and physical or chemical soil attributes. These organisms are active in the cycling of nutrients, since they fragment the organic matter hereby accelerating microbial decomposition. The aim of this study was to evaluate the invertebrate community in no-tillage, conventional tillage, minimum tillage and secondary forest in regeneration to determine the relationship of mesofauna to litter, soil attributes, management and seasonality. Therefore, ten soil samples in each system and eight litter samples in no-tillage and the forest were taken over four seasons. These samples remained in Berlese...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Diversity; No-tillage; Multivariate analysis; Fauna density; Mites.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162019001200165

Métodos de estimação de componentes de variância em modelos mistos desbalanceados
Provedor de dados: 63
Autores: Marcelino,Sandra Denisen do Rocio; Iemma,Antonio Francisco.
A estimação dos componentes de variância em modelos mistos tem merecido, nas últimas décadas, atenção especial dos pesquisadores. Sendo assim, vários métodos de estimação têm sido propostos, e diante de tal disponibilidade, escolher um deles pode não ser uma questão trivial. Nesse contexto, buscando fornecer aos usuários dos métodos de estimação de componentes de variância em modelos mistos desbalanceados, subsídios para uma opção tão confortável quanto possível do método mais adequado para a obtenção das estimativas, em suas pesquisas, o presente artigo apresenta, com ilustrações numéricas, os principais métodos de estimação. Ademais, apresenta, aos usuários não iniciados, conceitos introdutórios necessários para a utilização do PROC MIXED do Sistema...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: PROC MIXED; SAS; Componentes de variância; Modelo misto.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000400008

Cold tolerance at the germination stage of rice: methods of evaluation and characterization of genotypes
Provedor de dados: 63
Autores: Cruz,Renata Pereira da; Milach,Sandra Cristina Kothe.
Rice cold tolerance at the germination stage is important in Rio Grande do Sul (RS) where temperatures below 15°C prevent or reduce germination and plant establishment in early sowings. The present study aimed at identifying an adequate method for cold tolerance evaluation of the rice germination stage and at verifying the variability among 24 rice genotypes of different origins. Cold tolerance was evaluated in experiment I, germination under two conditions: 13°C for 28 days and 28°C for seven days, and in experiment II, germination under 28°C for 72 hours, 13°C for 96 hours and again 28°C for 72 hours. In experiment I measured characteristics were germination index, percentage of seeds with coleoptile length superior to 5 mm and percentage of reduction in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Oryza sativa L.; Low temperature; Variability; Indica and Japonica subspecies.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000100001

Oxidative damage and photosynthetic impairment in tropical rice cultivars upon exposure to excess iron
Provedor de dados: 63
Autores: Pinto,Samuel de Souza; Souza,Anna Elisa de; Oliva,Marco Antonio; Pereira,Eduardo Gusmão.
ABSTRACT Iron plays a pivotal role in the redox reactions of photosynthesis and metabolic processes such as chlorophyll synthesis. Iron availability in waterlogged soils can reach toxic levels and promote oxidative stress. Fe toxicity is the most concerning of stresses for rice in many lowland environments around the world and may cause severe impairments in rice photosynthesis. This study aimed to investigate the extension of oxidative stress after excess Fe exposure and its effects on the photosynthesis of rice cultivars with differential sensitivity. Three Brazilian rice cultivars (EPAGRI 107, BRSMG SELETA and BR IRGA 409) were grown in Hoagland nutrient solution (pH 4.0) with two Fe-EDTA doses corresponding to excess Fe (7 mM) and control (0.009 mM)...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: TBARS; Iron toxicity; Light energy dissipation; Oxidative stress; Photosynthesis.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000300217

Isolamento e cultivo de protoplastos de porta-enxertos de citros
Provedor de dados: 63
Autores: Oliveira,R.P. de; Mendes,B.M.J.; d' Utra Vaz,F.B.; Tulmann Neto,A.
Realizou-se o isolamento e cultivo de protolastos de porta-enxertos de citros das variedades limoeiro Cravo e tangerina Cleópatra. Utilizou-se solução enzimática para a digestão da parede celular de células em suspensão (7 a 10 subcultivos em meio de cultura MT) e procedeu-se a purificação criteriosa. O plaqueamento dos protoplastos foi realizado em meio de cultivo KM8p e na molaridade de 0.6 M, sob condições de escuro a 28 ± 1°C, após ajuste para a densidade de 2 x 10s ppts/mL A redução da pressão osmótica do meio de cultivo foi realizada a cada 10 dias na seguinte proporção de meio de cultura KM8p 0.6 M e KM8 (2:1, 1:1, 1:2, 0:3). Com relação aos resultados, obteve-se em média o isolamento de 0.7 x 10(6) ppts / ml de suspensões celulares de tangerina...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Porta-enxerto; Citros; Protoplastos.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000200007

Spittlebug infestation in sugarcane affects ethanolic fermentation
Provedor de dados: 63
Autores: Ravaneli,Gisele Cristina; Madaleno,Leonardo Lucas; Presotti,Leandro Eduardo; Mutton,Miguel Angelo; Mutton,Márcia Justino Rossini.
The spittlebug (Mahanarva fimbriolata) has become a key pest of the sugarcane crop in Brazil with the increase of green-cane harvesting, causing stalk yield and cane quality losses. This research was undertaken to evaluate the effects of the spittlebug (Mahanarva fimbriolata) on cane quality and juice fermentation. The experiment was arranged in a completely randomized 5 × 2 factorial design, with five spittlebug infestation levels (0-0.5; 0.6-2.5; 2.6-5; 5.1-8; 8.1-12.5 nymphs m-1), controlled or not with thiamethoxam (0.2 kg of active ingredient ha-1). To conduct fermentation, Saccharomyces cerevisiae (fresh and pressed baker's yeast) was inoculated to musts at a concentration of 30 g L-1. Microbiological analyses were performed at the beginning, middle...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Saccharum spp.; Mahanarva fimbriolata; Fermentation process; Ethanol production.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000600004

Biologia de Anticarsia gemmatalis Hübner, 1818 (Lepidoptera: Noctuidae) na cultura da soja
Provedor de dados: 63
Autores: Magrini,Eliana Aparecida; Botelho,Paulo Sérgio Machado; Silveira Neto,Sinval.
Estudou-se a biologia de Anticarsia gemmatalis (Lepidoptera: Noctuidae) em campos de soja. Os experimentos foram conduzidos durante os períodos agrícolas de 1992 a 1997. Em cada ano foram realizadas duas avaliações, com 20 repetições para cada fase do ciclo de A. gemmatalis. Os insetos levados ao campo foram criados por duas gerações, em laboratório, sobre folhas de soja da variedade hospedeira à temperatura de 27 ± 1 oC, fotofase de 14 horas e 60 ± 10 % UR até a fase de pupa. Foram determinados o número, viabilidade e período de incubação de ovos e viabilidade das fases larval e pupal, longevidade dos adultos, ritmo de postura e razão sexual. A viabilidade média para a fase de ovo variou de 43,0 % (1996) a 76,3 % (1997), sendo a duração média de 3,60...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Controle biológico; Lagarta da soja; Praga agrícola; Temperatura.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000300006

Isotopic view of vegetation and carbon and nitrogen cycles in a cerrado ecosystem, southeastern Brazil
Provedor de dados: 63
Autores: Coletta,Luciana Della; Nardoto,Gabriela Bielefeld; Latansio-Aidar,Sabrina Ribeiro; Rocha,Humberto Ribeiro da.
Carbon and nitrogen biogeochemical cycles in savannas are strongly regulated by the seasonal distribution of precipitation and pulses of nutrients released during the wetting of the dry soil and are critical to the dynamics of microorganisms and vegetation. The objective of this study was to investigate the spatial and temporal variability of C and N isotope ratios as indicators of the cycling of these elements in a cerrado sensu stricto area, within a protected area in a State Park in the state of São Paulo, Brazil. The foliar δ13C and δ15N values varied from -33.6 to -24.4 ‰ and -2.5 to 4.5 ‰, respectively. The δ13C values showed a consistent relationship with canopy height, revealing the importance of structure of the canopy over the C isotopic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cerrado; Carbon; Nitrogen; Stable isotopes; Woody savanna.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000400006

Arbuscular mycorrhizal fungi and the occurrence of flavonoids in roots of passion fruit seedlings
Provedor de dados: 63
Autores: Soares,Ana Cristina Fermino; Martins,Marco Antônio; Mathias,Lêda; Freitas,Marta Simone Mendonça.
Composition and the role of root flavonoids in the regulation of mycorrhizal symbiosis are still poorly understood. Several flavonoids stimulate spore germination, mycelia growth and root colonization by arbuscular mycorrhizal fungi (AMF), and both root colonization and flavonoid composition are affected by plant nutritional status. Effects of AMF on the occurrence and content of aromatic secondary metabolites in the roots of passion fruit seedlings grown under two levels of phosphorus (P) fertilization (10 and 50 mg kg-1 of phosphorus) was studied. Seedlings were inoculated with Glomus clarum and a population of native fungi from a passion fruit plantation. Methanolic extracts of passion fruit seedlings roots were analyzed by high performance liquid...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Phenolic compounds; Mycorrhizal plants; Phosphorus nutrition.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000400005

Random and systematic spatial variability of 137Cs inventories at reference sites in South-Central Brazil
Provedor de dados: 63
Autores: Correchel,Vladia; Bacchi,Osny Oliveira Santos; Reichardt,Klaus; De Maria,Isabella Clerici.
The precision of the 137Cs fallout redistribution technique for the evaluation of soil erosion rates is strongly dependent on the quality of an average inventory taken at a representative reference site. The knowledge of the sources and of the degree of variation of the 137Cs fallout spatial distribution plays an important role on its use. Four reference sites were selected in the South-Central region of Brazil which were characterized in terms of soil chemical, physical and mineralogical aspects as well as the spatial variability of 137Cs inventories. Some important differences in the patterns of 137Cs depth distribution in the soil profiles of the different sites were found. They are probably associated to chemical, physical, mineralogical and biological...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cesium-137; Spatial distribution; Radioisotope; Sediment; Radioactive tracer.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000200013

Seed priming with hormones does not alleviate induced oxidative stress in maize seedlings subjected to salt stress
Provedor de dados: 63
Autores: Carvalho,Rogério Falleiros; Piotto,Fernando Angelo; Schmidt,Daiana; Peters,Leila Priscila; Monteiro,Carolina Cristina; Azevedo,Ricardo Antunes.
Seed priming with hormones has been an efficient method for increasing seed vigor as well as seedling growth under stressful conditions. These responses have in the past been attributed to the activation of antioxidant systems in a range of crops. The results described in this work show that hormonal priming with methyl jasmonate, salicylic acid or CEPA (chloroethylphosphonic acid), an ethylene (ET) releaser, does not induce the antioxidant activity of superoxide dismutase, catalase, ascorbate peroxidase or glutathione reductase in maize seedlings subjected to salt stress. The enhanced biomass of maize seedlings under salt stress that was observed only from ET priming indicates that the stress tolerance in maize from ethylene priming is a fundamental...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays; Antioxidant systems; Hormonal pretreatment; Salinity; Seedling growth.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000500014

Erratum
Provedor de dados: 63
Tipo: Info:eu-repo/semantics/other
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000402001

CTAB methods for DNA extraction of sweetpotato for microsatellite analysis
Provedor de dados: 63
Autores: Borges,Aline; Rosa,Mariana Silva; Recchia,Gustavo Henrique; Queiroz-Silva,Jurema Rosa de; Bressan,Eduardo de Andrade; Veasey,Elizabeth Ann.
Microsatellite markers have proved to be useful in genetic diversity assessments of sweetpotato (Ipomoea batatas) but practical DNA extraction methods to ensure good quality and quantity DNA for these studies are yet to be established. This study compares the efficiency of three modified methodologies for DNA extraction of six sweetpotato landraces using the CTAB extraction buffer in regard to quantity and purity of DNA quantification and microsatellite band patterns. All methodologies yielded satisfactory results, but the method based in leaf tissue macerated in liquid nitrogen was deemed more adequate because of its simplicity and lower cost. However, the method based in dry leaf tissue was considered more advantageous, first because elicits...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ipomoea batatas; SSR; DNA isolation; Landraces; Protocol.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000400015

CONDUTIVIDADE ELÉTRICA EM SEMENTES DE TOMATE (Lycopersicon lycopersicum L.)
Provedor de dados: 63
Autores: Sá,Marco Eustáquio de.
Sementes de tomate, sendo dois lotes comerciais do cultivar Petomech e dois lotes do cultivar Santa Clara, foram estudados com o objetivo de se avaliar as variações nos resultados de teste de condutividade elétrica, em função do período de embebição (6, 12, 18 e 24 horas) e do número de sementes utilizadas no teste (25, 50 e 100), procurando-se relacionar os resultados com a emergência das plântulas e o desempenho das sementes em outros testes, em tres épocas de avaliação. Os resultados obtidos mostraram comportamento diferenciado dos cultivares, com valores mais altos de condutividade elétrica para as sementes do cultivar Petomech. Observaram-se também diferenças acentuadas entre os dois lotes do cultivar Petomech em termos de condutividade. Os acréscimos...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sementes; Tomate; Condutividade elétrica; Tempo de embebição.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000100003

Survey of viruses belonging to different genera and species in noble garlic in Brazil
Provedor de dados: 63
Autores: Mituti,Tatiana; Moura,Mônika Fecury; Marubayashi,Julio Massaharu; Oliveira,Milena Leite; Imaizumi,Vitor Massami; Sakate,Renate Krause; Pavan,Marcelo Agenor.
Garlic (Allium sativumL.) is a host to several viruses, most commonly those belonging to theAllexivirus,Carlavirus, orPotyvirusgenera. Nine species distributed among these three genera have been reported in Brazil: two species within carlaviruses, two within potyviruses, and five within allexiviruses. To quantify the prevalence of these viruses, young leaves from 520 plants (plants either symptomatic or asymptomatic) were collected from commercial fields grown in four Brazilian states and analyzed using universal and species-specific primers via the reverse transcription polymerase chain reaction (RT-PCR). Potyvirus presence was positive in 306 samples (81 %), 151 of them (38 %) in mixed infections with other viruses. The most frequent potyviruses...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Allexivirus; Allium sativum; Carlavirus; Potyvirus; Occurrence.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162015000300278

Papaya recombinant inbred lines selection by image-based phenotyping
Provedor de dados: 63
Autores: Cortes,Diego Fernando Marmolejo; Santa-Catarina,Renato; Azevedo,Alinne Oliveira Nunes; Poltronieri,Tathianne Pastana de Sousa; Vettorazzi,Julio Cesar Fiorio; Moreira,Nádia Fernandes; Ferreguetti,Geraldo Antônio; Ramos,Helaine Christine Cancela; Viana,Alexandre Pio; Pereira,Messias Gonzaga.
ABSTRACT: The selection of superior Carica papaya (L) genotypes depends on the availability of genetic variability and on the favorable and simultaneous response of the genotypes to those traits of most interest. However, manual phenotyping (MP) demands intensive labor, is time-consuming and expensive. The aim of the current study is to access the efficiency of image-based phenotyping (IBP) in estimating genetic parameters and in selecting F4 recombinant inbred lines. The genetic parameters and values were estimated in accordance with the REML/BLUB procedure and combined selection using the selection index based on standardized genetic values. The majority of traits accessed through IBP showed experimental coefficients of variation similar to those found...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Carica papaya; Digital phenotyping; Genetic gains; Genetic parameters.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162018000300208

Fotointerpretação de padrões de drenagem de bacias hidrográficas na caracterização de solos desenvolvidos de rochas eruptivas básicas no estado do Paraná
Provedor de dados: 63
Autores: Demattê,J.A.M.; Demètrio,V.A.
Utilizando fotografias aéreas na escala 1:25.000, o presente trabalho teve por objetivo caracterizar os padrões da rede de drenagem, a partir de bacias hidrográficas de 3ª ordem de ramificação, em três regiões de solos desenvolvidos de rochas eruptivas básicas no Estado do Paraná. As unidades de mapeamento são: brunizem avermelhado+litossolos associados, terra roxa estruturada e latossolo roxo. A densidade de drenagem, freqüência de rios e a razão de textura média foram as propriedades mais significativas na separação dos solos das áreas, permitindo também constatar variações de drenagem dentro de uma mesma unidade de solo. Pelo teste de semelhança geométrica foi possível obter "grupos" de bacias representativas de uma mesma unidade de mapeamento. Há...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fotointerpretação; Rede de drenagem; Rochas eruptivas básicas; Bacias hidrográficas; Amostras circulares; Foopedologia.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000300026

Inheritance of resistance to oat crown rust in recombinant inbred lines
Provedor de dados: 63
Autores: Graichen,Felipe André Sganzerla; Martinelli,José Antônio; Federizzi,Luiz Carlos; Pacheco,Marcelo Teixeira; Chaves,Márcia Soares; Wesp,Caroline de Lima.
Crown rust is the main disease affecting oats (Avena sativa L.), and genetic resistance has been the chief method utilized to control this disease. A population composed of 135 recombinant inbred lines, F5:6, generated by crossing the oat cultivar UFRGS 8 with the genotype Pc68/5*Starter, was assessed on the inheritance of resistance to crown rust (Puccinia coronata f. sp. avenae P. Syd. &amp;amp; Syd.). The evaluation of resistance in F5:6 seedlings was based on the type of infection resulting from inoculation with the race SQPT of P. coronata f. sp. avenae. The proportion of Resistant: Susceptible seedlings (R:S) was 62:64, which indicates that inheritance was governed by a single gene. The assessment of resistance inheritance in adult plants was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Avena sativa; Puccinia coronata f. sp. avenae; Pc68 gene; Race-specific resistance.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000400010

Adult attractiveness and oviposition preference of Bemisia tabaci (Genn.) (Homoptera: Aleyrodidae) B-biotype in cotton genotypes
Provedor de dados: 63
Autores: Boiça Júnior,Arlindo Leal; Campos,Zeneide Ribeiro; Lourenção,André Luiz; Campos,Alcebíades Ribeiro.
The silverleaf whitefly Bemisia tabaci B-biotype is an important pest of cotton; it affects plant vigour, transmits geminivirus and reduces lint quality. In order to evaluate the resistance of cotton genotypes, Gossypium hirsutum (L.), to the whitefly Bemisia tabaci B-biotype, both free-choice and no-choice attractiveness and non-preference for oviposition tests were carried out in a shade house, at room temperature. Low attractiveness to adults of this whitefly was observed for plants of genotypes Fabrika, CNPA Ita 90, Makina, Coodetec 407, and IAC 01-639 CPA 02-24, which may represent a resistance component of these genetic materials to the insect. Genotypes BRS Aroeira, Coodetec 406, Fabrika, and Coodetec 401 presented the non-preference-for-oviposition...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gossypium hirsutum L.; Aleyrodidae; Insecta; Silverleaf whitefly; Host plant resistance.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000200007

Cádmio e a atividade de peroxidase durante a germinação de sementes de feijoeiro
Provedor de dados: 63
Autores: Rossi,Celso; Lima,Giuseppina Pace Pereira.
Sementes de feijoeiro cv. Carioca, foram germinadas no escuro em diferentes concentrações de cádmio (1, 2, 5 e 10 mimol L-1) e coletadas após 24, 48 , 72 e 96 horas com o objetivo de verificar se a atividade da peroxidase, poderia ser utilizada como marcador bioquímico de estresse promovido pelo cádmio. Observaram-se alterações na atividade específica da peroxidase (EC 1.11.1.7) tanto nos cotilédones como nas raízes, em função do tempo de exposição das sementes nas diferentes concentrações de cádmio. A enzima peroxidase (EC 1.11.1.7) pode ser usada como um indicador de estresse causado pelo cádmio durante a germinação de sementes de feijão, indicando possíveis injúrias causadas nas sementes pelo metal.
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Phaseolus vulgaris; Peroxidase; Cádmio; Sementes.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000100030

Field performance of "marsh seedless" grapefruit on trifoliate orange inoculated with viroids in Brazil
Provedor de dados: 63
Autores: Stuchi,Eduardo Sanches; Silva,Simone Rodrigues da; Donadio,Luiz Carlos; Sempionato,Otávio Ricardo; Reiff,Eduardo Toller.
Some viroids reduce citrus tree growth and may be used for tree size control aiming the establishment of orchards with close tree spacing that may provide higher productivity than conventional ones. To study the effects of citrus viroids inoculation on vegetative growth, yield and fruit quality of 'Marsh Seedless' grapefruit (Citrus paradisi Macf.) grafted on trifoliate orange [Poncirus trifoliata (L.) Raf.], an experiment was set up in January 1991, in Bebedouro, São Paulo State, Brazil. The experimental design was randomized blocks with four treatments with two plants per plot: viroid isolates Citrus Exocortis Viroid (CEVd) + Hop stunt viroid (HSVd - CVd-II, a non cachexia variant) + Citrus III viroid (CVd-III) and Hop stunt viroid (HSVd - CVd-II, a non...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Growth; Yield; Fruit quality; Exocortis; Dwarfing.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000600004

Cytogenetic analysis of the Amazon stingless bee Melipona seminigra merrillae reveals different chromosome number for the genus
Provedor de dados: 63
Autores: Francini,Izaura Bezerra; Gross,Maria Claudia; Nunes-Silva,Carlos Gustavo; Carvalho-Zilse,Gislene Almeida.
Cytogenetic analysis of the Amazon stingless bee Melipona seminigra merrillae, by conventional Giemsa staining and C-banding, revealed a different chromosome number for Melipona: 2n = 22 for females and diploid drones while the haploid drones present n = 11. There is no evidence of B chromosomes. This result contrasts with previous studies, in which the chromosome number of 19 Melipona species was determined as 2n = 18 for females and n = 9 for haploid males. Based on cytogenetic information available for other Melipona species, we propose that M. s. merrillae has a more derived diploid number. This indicates that chromosome number is not a conservative characteristic within the genus as previously thought. Cytogenetic data for stingless bees are scarce,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Meliponini; Neotropics; Cytogenetics; Diploid male chromosomes.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000500012

Sequential feeding with diets varying in amino acid content for growing-finishing pigs
Provedor de dados: 63
Autores: Silva,Welex Cândido da; Campos,Paulo Henrique Reis Furtado; Santos,Luan Sousa dos; Veira,Alini Mari; Fraga,Alícia Zem; Hauschild,Luciano.
ABSTRACT This study aimed to evaluate the effects of daily phase feeding (DP) and sequential feeding (SEQ) on the feeding behavior, performance, and body composition of growing-finishing pigs. Sixty barrows at 29.7 ± 2.8 kg body weight (BW) were assigned to one of four treatments: DP with a blended proportion of feeds A (high nutrient density) and B (low nutrient density) was adjusted to match 100 % of daily amino acid (AA) diet recommendations (DP100); a negative treatment, which matched 70 % of daily AA diet recommendations (DP70); and two SEQ with a blend of feeds A and B, adjusted twice a day (at 00h00 and 12h00), to match 70 or 110 % of daily AA diet recommendations during two 12 h intervals: SEQ110-70 and SEQ70-110. DP70 and SEQ showed a lower feed...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Circadian rhythms; Daily feeding phase; Feeding techniques; Precision feeding.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000400401

Influence of natural and synthetic carotenoids on the color of egg yolk
Provedor de dados: 63
Autores: Spada,Fernanda Papa; Selani,Miriam Mabel; Coelho,Antonio Augusto Domingos; Savino,Vicente José Maria; Rodella,Arnaldo Antônio; Souza,Miriam Coelho; Fischer,Flavia Salgado; Lemes,Dayane Elizabethe Aokui; Canniatti-Brazaca,Solange Guidolin.
ABSTRACT Carotenoids are incorporated into the diet of laying hens in order to modify the yolk color. A natural source of carotenoids in tropical countries is annatto, which could be used in the diets of hens. This study aimed to evaluate the addition of natural (annatto) and synthetic carotenoids to the diet of laying hens (commercial and alternative) and their effects on yolk color and consumer sensory perception of fresh and stored eggs obtained from two different preparations (boiled and fried). Physicochemical analysis of proximate composition, thiobarbituric acid reactive substances (TBARS), emulsion activity and instrumental color were performed. Cooking caused significant alterations to the moisture in the preparations and this may have directly...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bixa orellana; Prepared foods; Sensory evaluation; Genetic diversity.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000300234

Heterotic responses of tropical elite maize accessions from Latin America with Brazilian testers
Provedor de dados: 63
Autores: Santos,Manoel Xavier dos; Pollak,Linda Maria; Carvalho,Hélio Wilson Lemos de; Pacheco,Cleso Antônio Patto; Gama,Elto Eugenio Gomes e; Guimarães,Paulo Evaristo de Oliveira; Andrade,Ramiro Vilela de.
Little emphasis has been placed on identifying new sources of tropical maize germplasm that can be used in breeding programs. Additional information on the performance and heterotic classification of tropical germplasm is needed. This study was conducted to identify elite maize accessions from Latin America that could contribute to increase the level of heterosis with the best heterotic patterns of Brazil. Seventy-two elite accessions from the Latin American Maize Project (LAMP) were crossed with the testers BR 105 (flint kernel Suwan background) and BR 106 (dent kernel Tuxpeño background). The 72 crosses plus 9 checks were evaluated using a simple 9 × 9 lattice in four locations that represent one tropical region. The combined analysis showed highly...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Germplasm; Selected acessions; Heterosis; Genetic resources.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000400019

Histopathological characterization of Coffea arabica cultivar IPR 106 resistance to Meloidogyne paranaensis
Provedor de dados: 63
Autores: Shigueoka,Luciana Harumi; Dorigo,Orazília França; Arita,Lucas Yuuki; Fonseca,Inês Cristina de Batista; Silva,Santino Aleandro da; Sera,Gustavo Hiroshi; Machado,Andressa Cristina Zamboni.
ABSTRACT: Meloidogyne species are widely distributed in coffee growing areas in Brazil, where M. paranaensis is responsible to significant losses to the crop. One of the main management strategies is the use of resistant cultivars, such as Apoatã rootstock and cultivars IPR 100 and IPR 106. However, the parasitic relationship between coffee and M. paranaensis in cultivars carrying resistance genes has been poorly understood. The objective of this paper was to characterize the resistance response of Coffea arabica cv. IPR 106 to M. paranaensis. For this, penetration and histopathological studies were carried out using root tissues parasitized by the nematode. ‘IPR 106’ and ‘Mundo Novo’ (susceptible cultivar) seedlings were inoculated with 4,000 eggs of M....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Management; Root-knot nematodes; Giant cells.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162019001500434

Sarcoplasmatic and myofibrillar protein changes caused by acute heat stress in broiler chicken
Provedor de dados: 63
Autores: Santos,Carolina de Castro; Delgado,Eduardo Francisquine; Menten,José Fernando Machado; Pedreira,Aparecida Carla de Moura; Castillo,Carmen Josefina Contreras; Mourão,Gérson Barreto; Brossi,Camila; Silva,Iran José Oliveira da.
Acute heat stress (AHS) modifies the structure of myofibrils affecting functional properties of meat, mainly the water holding capacity. This experiment aimed to identify changes in proteolysis and migration between the myofibrillar and sarcoplasmatic fractions due to pre-slaughter AHS. Myofibrillar fragmentation index (MFI), SDS-PAGE, western blot of vinculin (WB) and shear force (SF) were determined. Six hundred broilers (Gallus gallus) were slaughtered in three different days (ST). In each ST, groups of ten animals were placed in transport crates and submitted to AHS (35ºC, 75 - 85% RH) for 2 hours. Simultaneously, the non-stressed broilers (NS) were kept in thermoneutral environment (22ºC, 83 ± 6.6% RH) within the crates in the same density. After...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Broiler; Heat stress; Lightness; Fragmentation index; Shear force.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000500002

Microsporogenesis in Brachiaria bovonei (Chiov.) Robyns and B. subulifolia (Mez) Clayton (Poaceae)
Provedor de dados: 63
Autores: Risso-Pascotto,Claudicéia; Pagliarini,Maria Suely; Valle,Cacilda Borges do.
Some African species of Brachiaria have been introduced into the Americas and became the most important forage for pastures in the tropics. New cultivars can be obtained either from direct selections from the natural existing variability in the germplasm collections or from interspecific hybridizations. Polyploidy is predominant in the genus Brachiaria and correlated with apomixis which complicates hybridization. The objective of cytological studies underway on the Brachiaria germplasm collection at Embrapa Beef Cattle is to determine the chromosome number and meiotic behavior of accessions. For the breeding of Brachiaria species, compatible sexual and apomictic accessions need to be identified. Microsporogenesis was evaluated in two accessions of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brachiaria; Meiosis; Chromosome number; Polyploidy; Breeding program.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000500015

Scaling to generalize a single solution of Richards' equation for soil water redistribution
Provedor de dados: 63
Autores: Sadeghi,Morteza; Ghahraman,Bijan; Davary,Kamran; Hasheminia,Seyed Majid; Reichardt,Klaus.
Using scaling methods, a single solution of Richards' equation (RE) will suffice for numerous specific cases of water flow in unsaturated soils. In this study, a new method is developed to scale RE for the soil water redistribution process. Two similarity conditions are required: similarity in the shape of the soil water content profiles as well as of the water flux density curves. An advantage of this method is that it is not restricted to a specific soil hydraulic model - hence, all such models can be applied to RE. To evaluate the proposed method, various soil textures and initial conditions were considered. After the RE was solved numerically using the HYDRUS-1D model, the solutions were scaled. The scaled soil water content profiles were nearly...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nielsen-similarity; Spatial variability; Invariant solutions.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000500011

Phenotypic and molecular characterization of apple (Malus × domestica Borkh) genetic resources in Greece
Provedor de dados: 63
Autores: Ganopoulos,Ioannis; Tourvas,Nikolaos; Xanthopoulou,Aliki; Aravanopoulos,Filippos A.; Avramidou,Euaggelia; Zambounis,Antonios; Tsaftaris,Athanasios; Madesis,Panagiotis; Sotiropoulos,Thomas; Koutinas,Nikolaos.
ABSTRACT: The phenotypic and genetic analysis of apple (Malus × domestica Borkh) genotypes is essential for breeding species. Information on the morphology and genetic structure of apple offers significant help for germplasm maintenance and selection of suitable material to breed superior cultivars. This study shows the results of an investigation on the morphology and the genetic diversity for 19 apple cultivars, which are preserved in an ex situ collection in Naoussa, Central Macedonia, Greece. Information was recorded over a 5-year period for 47 traits describing plant morphology and phenotype, as well as leaf and fruit quality. Data were analyzed using the principal component analysis (PCA) method. The Euclidean distance metric and the Ward’s...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Genetic diversity; Genotyping; Microsatellite markers; Multivariate analysis; Phenotyping.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162018000600509

Selection for bulb maturity in onion
Provedor de dados: 63
Autores: Cardoso,Antonio Ismael Inácio; Costa,Cyro Paulino da.
It is possible to produce onions (Allium cepa) all over the year in Brazil, but most of the Brazilian cultivars have poor quality bulbs, a fact that favours onion imports from Argentina, a producer of Valenciana type cultivars that does not bulb in Brazil, but please Brazilian consumers. To study the effect of selection for bulb maturity, seventeen half sib progenies selected for early maturity and twenty five for late maturity, from the intervarietal triple cross [Crioula x (Pira Ouro x Valenciana Sintetica 14)] were grown, along with the triple cross itself and the cultivars Pira Ouro (short-day), Crioula (intermediate-day) and Armada (long-day). A total of forty six treatments were tested in a randomized block design with three replications of 32 plants...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Allium cepa; Cycle; Bulbification; Breeding.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000100009

Chelating agents to solubilize heavy metals from Oxisols contaminated by the addition of organic and inorganic residues
Provedor de dados: 63
Autores: Coscione,Aline Renée; Abreu,Cleide Aparecida de; Santos,Gláucia Cecília Gabrielli dos.
Phytoremediation is an attractive technique for soils contaminated with heavy metals, especially in conjunction with chelating agents to assist metal phytoextraction. Nevertheless, their studies in Brazil are rare. Thus, the objective of the present work was to evaluate the efficiency of the chelating agents EDDS and EDTA for the solubilization of heavy metals from two Oxisols contaminated by organic sources in Jaguariúna (LVJ) and inorganic sources in Paulínia (LVP), São Paulo State, Southeastern Brazil. First, the soil samples were fractionated and the DTPA method was used to quantify heavy metals available forms. The results indicated that the metals were highly available in the soil fractions and could be solubilized by the chelating agents. The soil...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil pollution; Chelating agents; Tropical soils; Fractionation.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000100009

Early generation selection strategy for yield and yield components in white oat
Provedor de dados: 63
Autores: Benin,Giovani; Carvalho,Fernando Irajá Félix de; Oliveira,Antônio Costa de; Lorencetti,Claudir; Valério,Igor Pires; Schmidt,Douglas André Mallmann; Hartwig,Irineu; Ribeiro,Guilherme; Vieira,Eduardo Alano; Silva,José Antonio Gonzales da.
Several studies have searched for higher efficiency on plant selection in generations bearing high frequency of heterozygotes. This work aims to compare the response of direct selection for grain yield, indirect selection through average grain weight and combined selection for higher yield potential and average grain weight of oat plants (Avena sativa L.), using the honeycomb breeding method. These strategies were applied in the growing seasons of 2001 and 2002 in F3 and F4 populations, respectively, in the crosses UPF 18 CTC 5, OR 2 &lt;FONT FACE=Symbol&gt;´&lt;/FONT&gt; UPF 7 and OR 2 &lt;FONT FACE=Symbol&gt;´&lt;/FONT&gt; UPF 18. The ten best genetic combinations obtained for each cross and selection strategy were evaluated in greenhouse yield trials....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Selection method; Heritability; Single plant selection.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000400009

Armazenamento da castanha do pará com e sem casca: efeito da temperatura na resistência ao ranço
Provedor de dados: 63
Autores: Ribeiro,M.A.A.; Regitano-D'arce,M.A.B.; Lima,U.A.; Baggio,C.E.
O presente trabalho visou ao estudo do comportamento da fração lipídica de castanhas do Pará em casca e descascadas, conservadas por 4 meses em sacos de papel Kraft, nas seguintes condições: ao ambiente, a 2°C e -15°C. Nas castanhas em casca, mantidas ao ambiente, a formação de peróxidos somente ocorreu a partir do 2° mês, alcançando o valor de 0,16 meq O2/kg de óleo. Dentro do mesmo período, a 2°C e -15°C, isto ocorreu de forma mais lenta, chegando a 0,10 meq O2/kg, nos dois tratamentos. As castanhas descascadas apresentaram, no início, 9,18 meq O2/Kg de índice de peróxido e l mg KOH/g de óleo de índice de acidez. Após 4 meses ao ambiente, o índice de peróxido chegou a 23,3 meq O2/Kg e a acidez a 2 mg KOH/g, com redução do índice de iodo. Para as...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Castanha do Pará; Armazenamento; Temperatura de armazenamento; Ranço; Óleo.
Ano: 1993
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161993000300004

Charge sparsity: An index to quantify cation effects on clay dispersion in soils
Provedor de dados: 63
Autores: Melo,Thadeu Rodrigues de; Machado,Wesley; Tavares Filho,João.
ABSTRACT: Few approaches have been developed to measure the isolated effect of exchangeable cations on clay dispersion in soils. In this study, the charge sparsity (CS) index was proposed using the ratio between the cations hydrated ionic radius and valence. The index capacity to measure cation effects on clay dispersion in soils was also evaluated. Three Ferralsols, sampled at different sites in Paraná State, Brazil, were homoionized with Ca2+, Mg2+, K+, or Na+ prior to evaluation of the clay dispersion degree. Published independent data for two soils and clays were also used. We tested the capacity of CS and II, the latter proposed by Marchuck and Rengasamy (2011), to predict clay dispersion in soils. The CS predicted the dispersion degree more...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Colloids; Electrical double layer; Aggregation; Flocculation; Zeta potential.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000101400

Vigor and mortality of citrus progenies with potential use as rootstocks
Provedor de dados: 63
Autores: Santana,Lizziane Gomes Leal; Souza,Edson dos Santos; Passos,Orlando Sampaio; Gesteira,Abelmon da Silva; Ledo,Carlos Alberto da Silva; Soares Filho,Walter dos Santos.
ABSTRACT: Rootstocks influence certain characteristics of the scion, such as vigor, fruit yield and quality, and tolerance to biotic and abiotic factors. In conventional citrus breeding programs, hybridization is the main method used for obtaining rootstock varieties. Between Sept and Oct 2006, controlled pollinations were carried out resulting in nine progenies, totaling 461 hybrid seedlings. The female parents were the ‘Santa Cruz Rangpur’ lime (SCRL) and the ‘Sunki of Florida’ mandarin (SFM), while the male parents, in addition to this mandarin, were the ‘Indio’ and ‘Riverside’ citrandarins, the ‘Thomasville’ citrangequat (THOM), the ‘Swingle’ citrumelo, the ‘Argentina’ citrange (AGC) and the ‘Benecke’ trifoliate orange (BKTO). Fruit setting rates of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Citrus spp.; Poncirus trifoliata; Hybridization; Plant breeding.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162018000400339

Biology and nutrition of Spodoptera frugiperda (Lepidoptera: Noctuidae) fed on different food sources
Provedor de dados: 63
Autores: Silva,Débora Mello da; Bueno,Adeney de Freitas; Andrade,Karine; Stecca,Cristiane dos Santos; Neves,Pedro Manuel Oliveira Janeiro; Oliveira,Maria Cristina Neves de.
ABSTRACT: We studied Spodoptera frugiperda development using different food sources in the laboratory and field. Newly hatched larvae were fed soybean, cotton, maize, wheat, and oat leaves. An artificial diet was used as the control. Duration of pre-pupal, pupal, and larva-adult period, pupal weight, sex ratio, survival, larva feeding preferences, oviposition preferences, and nutritional quality of different hosts were evaluated. Insects fed on wheat showed the shortest larva-adult period. The insects fed on cotton and soybean had longer larval development cycles and pupae of lower weight. Feeding preference was evident for third instar larvae and did not differ between wheat, oat, maize, and soybean, which were the preferred hosts. Moths oviposited to a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Agricultural entomology; Feeding behavior; Insect-plant interactions.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162017000100018

Soil macrofauna in cover crops of figs grown under organic management
Provedor de dados: 63
Autores: Merlim,Analy de Oliveira; Guerra,José Guilherme Marinho; Junqueira,Rodrigo Modesto; Aquino,Adriana Maria de.
Soil fauna plays an important role in organic management through their effects on soil organic decomposition, nutrient mineralization, and amelioration of the soil's physical properties. This work evaluates the density and diversity of the soil macrofauna under types of cover plants in areas cultivated with Ficus carica L. under organic management. The soil macrofauna was collected in 0.25 × 0.25 m areas, down to a soil depth of 0.3 m, and at the surface layer. The treatments consisted of bahiagrass living mulch (Paspalum notatum), siratro living mulch (Macroptilium atropurpureum), and bahiagrass mulch. The highest macrofauna density and the lowest diversity were observed in bahiagrass, of which 80% were represented by ants, thus characterizing the soil...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ficus carica L; Soil fauna; Soil quality indicators.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000100011

Ensaio de combate ao ácaro da leprose de citros Brevipalpus phoenicis (Geijskes, 1939) com novo juvenóide e outros acaricidas
Provedor de dados: 63
Autores: Clari,A.I.; Cardoso,M.A.C.; Hamamura,R.; Rangel,R.C.; Regitano,E.B.; Mesquita,L.F.; Marconi,F.A.M.
Foi montado um ensaio visando conhecer a eficiência do flucicloxurom (juvenóide constituído de benzoil-fenil-uréia substituída), do propargite e do bromopropilato, no combate ao acaro da leprose (Brevipalpus phoenicis Geijskes, 1939). Os produtos foram empregados nas seguintes dosagens: A) testemunha; B) flucicloxurom, 10g; C) flucicloxurom, 15g; D) flucicloxurom, 20g; E) flucicloxurom, 30g; F) propargite, 72g; G) bromopropilato, 37,5g (tratamento padrão), sendo os valores supracitados quantidade de ingrediente ativo por 100 litros de calda. Foram aplicados 6 litros de calda por laranjeira, com pulverizador motorizado costal. Foram feitas 5 avaliações do combate: uma prévia (02 dias antes da pulverização) e quatro outras (07, 20, 34 e 50 dias...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ácaro da leprose; Brevipalpus phoenicis; Controle químico; Laranjeiras; Juvenóide.
Ano: 1993
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161993000100010

Density and diversity of diazotrophic bacteria isolated from Amazonian soils using N-free semi-solid media
Provedor de dados: 63
Autores: Silva,Krisle da; Nóbrega,Rafaela Simão Abrahão; Lima,Adriana Silva; Barberi,Alexandre; Moreira,Fatima Maria de Souza.
Non-symbiotic diazotrophic bacteria are amongst the most important functional groups of soil-dwelling microorganisms. These bacteria contribute to plant growth predominantly through biological N2 fixation. Here, we evaluated the density and diversity of non-symbiotic diazotrophic bacteria in soils taken from diverse land use systems (LUS) in Amazonia using nitrogen-free media. A total of 30 soil samples were collected from the following LUS: pristine forest, young secondary forest, old secondary forest, agroforestry, agriculture and pasture. Bacterial density was evaluated by the most probable number (MPN) method utilizing N-free semi-solid media with varied compositions (JNFb, NFb, LGI and Fam). Individual isolates were characterized by colony and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Burkholderia sp.; Enterobacter sp.; Serratia sp.; Bacillus sp.; Klebsiella sp.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000500002

Characterization of a new potyvirus causing mosaic and flower variegation in Catharanthus roseus in Brazil
Provedor de dados: 63
Autores: Maciel,Sheila Conceição; Silva,Ricardo Ferreira da; Reis,Marcelo Silva; Jadão,Adriana Salomão; Rosa,Daniel Dias; Giampan,José Segundo; Kitajima,Elliot Watanabe; Rezende,Jorge Alberto Marques; Camargo,Luis Eduardo.
Catharanthus roseus is a perennial, evergreen herb in the family Apocynaceae, which is used as ornamental and for popular medicine to treat a wide assortment of human diseases. This paper describes a new potyvirus found causing mosaic symptom, foliar malformation and flower variegation in C. roseus. Of 28 test-plants inoculated mechanically with this potyvirus, only C. roseus and Nicotiana benthamiana developed systemic mosaic, whereas Chenopodium amaranticolor and C. quinoa exhibited chlorotic local lesions. The virus was transmitted by Aphis gossypii and Myzus nicotianae. When the nucleotide sequence of the CP gene (768nt) was compared with other members of the Potyviridae family, the highest identities varied from 67 to 76 %. For the 3' UTR (286nt),...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: RT-PCR; Apocynaceae; Periwinkle; Diagnose; Genome sequencing.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000600013

SISTEMA AUTOMÁTICO DE FORNECIMENTO DE SOLUÇÃO NUTRITIVA PARA CULTIVO HIDROPÔNICO DE PLANTAS EM VASOS
Provedor de dados: 63
Autores: Maia,Nilson Borlina; Carmello,Quirino Augusto Camargo; Marques,Marcia Ortiz Mayo.
Desenvolveu-se um sistema automático de fornecimento de solução nutritiva com o objetivo de melhorar os resultados obtidos em trabalhos de pesquisa envolvendo a nutrição de plantas cultivadas em hidroponia. O sistema consiste de um conjunto de reservatórios equipados com moto-bombas individuais, dotados de bóias para controle dos níveis das soluções nutritivas nos vasos e um temporizador. O cultivo de plantas de hortelã (Mentha crispa) mostrou que a produção de folhas obtida com o sistema automático foi cerca de três vezes maior que a produção obtida com o sistema convencional. Constatou-se variação de concentrações dos nutrientes na parte aérea e raízes quando se comparou o sistema automático e convencional.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Solução nutritiva; Mentha crispa; Nutrição de planta; Hidroponia; Óleo essencial.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000100016

Fitting a taper function to minimize the sum of absolute deviations
Provedor de dados: 63
Autores: Silva,Lana Mirian Santos da; Rodriguez,Luiz Carlos Estraviz; Caixeta Filho,José Vicente; Bauch,Simone Carolina.
Multiple product inventories of forests require accurate estimates of the diameter, length and volume of each product. Taper functions have been used to precisely describe tree form, once they provide estimates for the diameter at any height or the height at any diameter. This study applied a goal programming technique to estimate the parameters of two taper functions to describe individual tree forms. The goal programming formulation generates parameters that minimize total absolute deviations (MOTAD). These parameters generated by the MOTAD method were compared to those of ordinary least squares (OLS) method. The analysis used a set of 178 trees cut from cloned eucalyptus plantations in the Southern part of the state of Bahia, Brazil. The values of the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: MOTAD; Ordinary least squares; Goal programming; Linear regression.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000500007

Demografia do perfilhamento e taxas de acúmulo de matéria seca em capim 'Tifton 85' sob pastejo
Provedor de dados: 63
Autores: Carvalho,Carlos Augusto Brandão de; Silva,Sila Carneiro da; Sbrissia,André Fischer; Pinto,Luiz Felipe de Moura; Carnevalli,Roberta Aparecida; Fagundes,Jailson Lara; Pedreira,Carlos Guilherme Silveira.
Neste ensaio foram avaliados os parâmetros de densidade populacional, taxas de emissão e de mortalidade, proporção de perfilhos florescidos e acúmulo de matéria seca de forragem para a espécie Cynodon spp. cultivar Tifton 85. Os tratamentos corresponderam a quatro situações de altura do pasto (5, 10, 15 e 20 cm) mantidas constantes por ovinos sob regime de lotação contínua e taxa de lotação variável. O delineamento experimental foi o de blocos completos casualizados com quatro repetições. Foram utilizadas áreas (&lt;FONT FACE="Symbol"&gt;@&lt;/FONT&gt; 0,0176 m²) delimitadas por anéis plásticos (PVC), onde todos os perfilhos existentes foram marcados com pequenas argolas plásticas coloridas e contados a cada avaliação. As taxas de acúmulo de matéria seca...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: População de perfilhos; Mortalidade; Florescimento; Acúmulo de forragem.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000400001

Alternation of host plants as a survival mechanism of leafhoppers Dilobopterus costalimai and Oncometopia facialis (Hemiptera: Cicadellidae), vectors of the Citrus Variegated Chlorosis (CVC)
Provedor de dados: 63
Autores: Milanez,José Maria; Parra,José Roberto Postali; Magri,Denise Cristina.
Dilobopterus costalimai (Young) and Oncometopia facialis (Signoret) are two of the most important species of citrus leafhoppers, vectors of bacterium Xylella fastidiosa which causes the Citrus Variegated Chlorosis (CVC) disease. To develop a rearing technique for these species under laboratory conditions, the egg laying preference and nymph development were studied in different breeding systems: Rangpur lime (Citrus limonia) and "falso boldo" (Vernonia condensata) as host plants. Trials were set up in a randomized block design with three treatments (n=8). Females of D. costalimai had particular preference for ovipositing on Rangpur lime leaves while O. facialis females placed a higher number of eggs on "falso boldo", but it did not differ statistically...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biology; Nutritional ecology; Host preference.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000400008

Carbon indices to assess quality of management systems in a Subtropical Acrisol
Provedor de dados: 63
Autores: Zanatta,Josiléia Acordi; Vieira,Frederico Costa Beber; Briedis,Clever; Dieckow,Jeferson; Bayer,Cimélio.
ABSTRACT: Management systems to improve soil quality are essential for agricultural and environmental sustainability. We assessed the quality of soil management systems applied to a subtropical Acrisol in terms of the carbon management index (CMI), the stratification ratio for total organic carbon (SR-TOC) and light fraction of organic matter (SR-LF). In addition, we examined their relationship to chemical, physical and biological soil quality indicators, as well as to maize yield. The study was conducted on a long-term experiment (18 years) in southern Brazil involving two different systems [no tillage (NT) and conventional tillage (CT)], two cropping systems [black oat/maize (O/M) and black oat + vetch/maize + cowpea (OV/MC)] and two nitrogen fertilizer...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Conservation agriculture; Cropping systems; No-till; Quality indicators.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162019001600501

SINTOMAS DE DESORDENS NUTRICIONAIS EM ESTÉVIA Stevia rebaudiana (Bert.) Bertoni
Provedor de dados: 63
Autores: Lima Filho,O. F. de; Malavolta,E.
São descritos e discutidos os sintomas de deficiência de N, P, K, Ca, Mg e B, e de toxicidade de B e Zn, em estévia cultivada em solução nutritiva. -N: desenvolvimento reduzido, folhas pequenas, pouca ramificação, e amarelecimento generalizado. -P: crescimento reduzido. -K: folhas encurvadas, precocemente, para baixo, aparentando menor teor de água; amarelecimento e necrose das folhas mais velhas e menor proporção de ramos. -Ca: pontuações escuras, clorose e necrose nas folhas, além de murchamento e colapso da porção superior do caule. -Mg: clorose internerval em algumas folhas mais velhas, em forma de "V" invertido. -B: raízes com diminuição do crescimento, engrossamento, ramificação curta e escurecimento geral; clorose, necrose e deformação das folhas;...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Estévia; Nutrição; Mineral; Deficiência; Toxicidade; Sintomas.
Ano: 1997
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161997000100008

Tratamento inseticida e qualidade de sementes de milho durante o armazenamento
Provedor de dados: 63
Autores: Smiderle,Oscar José; Cicero,Silvio Moure.
A presente pesquisa objetivou verificar os efeitos dos inseticidas deltametrina, clorpirifos, fosfina e da terra diatomácea no controle de insetos em sementes de milho, armazenadas durante 12 meses, visando oferecer alternativas de produtos inseticidas, utilizando delineamento inteiramente casualizado. As sementes do híbrido AG 303, tratadas com deltametrina e clorpirifos, aplicados na forma isolada ou em combinação, fosfina e terra diatomácea, foram acondicionadas em sacos de papel multifoliado e armazenadas por doze meses (maio/1997 a abril/1998) em condições normais de ambiente. Em intervalos bimestrais, sete épocas no total, as sementes foram submetidas às seguintes determinações: exame de sementes infestadas, massa de 100 sementes, teste de...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Inseticida; Armazenamento; Germinação; Terra diatomácea.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000500028

Natural crossing and isolation distance between cotton genotypes in turkey
Provedor de dados: 63
Autores: Bozbek,Taner; Ozbek,Nedim; Sezener,Volkan; Erdogan,Oktay; Yavas,Ilkay; Unay,Aydin.
The purposes of this study were to determine the percentage of out-crossing, isolation distance and pollinator insect species for cotton (Gossypium hirsutum L.) seed production in the Aydin region in Turkey. The glandless and red-leaf traits in G. hirsutum were used as genetic markers. Two experiments were conducted over two years that monitored out-crossing in adjacent rows and adjacent plants and established that the percentage of out-crossing varied. The percentage of out-crossing varied between 0% and 13.3% depending on the genetic marker. In the experiment to determine isolation distance, natural crossing percentage was not observed in 2002, while this percentage was 0.8% in the first rows in 2003. In this study, cotton fields were also visited once a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glandless; Read-leaf; Out-crossing; Pollinator insect; Seed purity.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000300012

Estabilidade da resistência de genótipos de caupi a Callosobruchus maculatus (Fabr.) em gerações sucessivas
Provedor de dados: 63
Autores: Lima,Marcileyne Pessôa Leite de; Oliveira,José Vargas de; Barros,Reginaldo; Torres,Jorge Braz; Gonçalves,Manoel Eneas de Carvalho.
Callosobruchus maculatus (Fabr.) (Coleoptera: Bruchidae) é a principal praga do caupi (Vigna unguiculata L.) armazenado em condições tropicais e subtropicais. Avaliaram-se a estabilidade da resistência e a capacidade de adaptação de C. maculatus a genótipos de caupi, durante seis gerações. Utilizou-se o teste sem chance de escolha, em delineamento experimental inteiramente casualizado, em esquema fatorial, com dez tratamentos, seis gerações do inseto e cinco repetições. Cada repetição constou de 30 grãos infestados com dois casais da praga. O número de ovos/fêmea diferiu entre os genótipos de caupi apenas na sexta geração, e entre as gerações em BR14-Mulato, Bico de Pato, TE90-180-3E e TE87-98-8G. A viabilidade de ovos diferiu entre as gerações em...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vigna unguiculata; Insecta; Resistência de plantas; Antibiose.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000200011

Broiler and swine production: animal welfare legislation scenario
Provedor de dados: 63
Autores: Silva,Raquel Baracat Tosi Rodrigues da; Nääs,Irenilza de Alencar; Moura,Daniella Jorge de.
Brazil is the world largest meat exporter and one of the most recent demands of the import market is directed towards animal welfare. Codes, norms and legislations used in Brazil are out of date, and in most cases those adopted for both poultry and swine production are based on international standards to meet trade requirements. This research aimed to study and describe an overall scenario of the standards, norms and legislations for animal welfare items applied to broiler and swine production: rearing, handling and transportation. The critical points of these items were identified in accordance to standards and current literature on animal welfare issues, effective on January 2008. The comparison was based on given scores varying from 1-5 (very bad to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Animal production; Rearing; Transportation; Environment; Norms.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000600001

Distribuição da diversidade isoenzimática e morfológica da mandioca na agricultura autóctone de Ubatuba
Provedor de dados: 63
Autores: Sambatti,Julianno Bergoch Monteiro; Martins,Paulo Sodero; Ando,Akihiko.
A diversidade fenotípica de quatro sistemas isoenzimáticos e doze caracteres morfológicos em mandioca (Manihot esculenta Crantz) foi quantificada através do índice de Shannon-Weaver para quatro roças de mandioca pertencentes a dois agricultores autóctones no município de Ubatuba-SP. A diversidade total foi repartida entre diversidade dentro de roças e diversidade entre roças, mostrando que a maior parte da diversidade se concentra dentro de roças para a maioria dos caracteres. Entrevistas foram realizadas para verificar se os agricultores reconhecem a existência de plantas de mandioca originadas por semente e a existência de bancos de semente.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Manihot esculenta; Shannon-Weaver; Dinâmica evolutiva; Conservação; Recurso genético.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000100013

Cytogenetic identification of wheat-Psathyrostachys huashanica amphiploid × triticale progenies for English grain aphid resistance
Provedor de dados: 63
Autores: Xie,Quan; Kang,Houyang; Sparkes,Debbie Louise; Tao,Shan; Hu,Zhiqin; Xu,Lili; Fan,Xing; Sha,Lina; Zhang,Haiqin; Wang,Yi; Zeng,Jian; Zhou,Yonghong.
English grain aphid (EGA, Sitobion avenae Fabricius) is an important pest in wheat (Triticum aestivum L.). To develop EGA-resistant varieties, introducing the desirable genes from related species is regarded as an efficient avenue. In this study, the F1, F2 and F3 plants derived from the cross of EGA-susceptible wheat-Psathyrostachys huashanica Keng ex Kuo amphiploid (PHW-SA, AABBDDNsNs) and EGA-resistant triticale (Zhongsi 828, AABBRR) were analyzed for EGA resistance. Consequently, PHW-SA was moderately susceptible while Zhongsi 828 and their F1 hybrids were immune, suggesting that the resistance is dominant. All the F2 plants showed high resistance or immunity over two years, indicating that EGA resistance genes are more likely carried by the rye...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chromosome constitutions; Genetic resources; Wide cross.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162013000300004

In vitro establishment of Heliconia rauliniana (Heliconiaceae)
Provedor de dados: 63
Autores: Rodrigues,Paulo Hercilio Viegas.
The great interest for heliconias by the external market has placed this crop in a prominent position in the flower production chain. The small offer of healthy seedlings, however, the expansion of this activity. The presence of endophytic microorganisms such as Pseudomonas sp. represents an obstacle even for the evolution of heliconia tissue culture studies. Stem apices of Heliconia rauliniana were inoculated and analyzed in vitro to investigate the presence of endophytic microorganisms. An antibiotic analysis was also run for posterior microbiological control. The presence of Pseudomonas sp. and Klebsiella sp. in stem apices confirmed infection. Antibiotics such as chloramphenicol, cefotaxime and the association of both (chloramphenicol + cefotaxime) at...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Tissue culture; Microbiologic control; Endophytics.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000100013

Marker-assisted selection of maintainer lines within an onion tropical population
Provedor de dados: 63
Autores: Santos,Carlos Antonio Fernandes; Leite,Daniela Lopes; Oliveira,Valter Rodrigues; Rodrigues,Marciene Amorim.
The traditional onion (Allium cepa) hybrid production requires the development of maintainer and male sterile lines and also a pollinator line with good specific combination ability. We report the identification of maintainer and male-sterile onion lines within the Brazilian 'Baia Periforme' derived population, 'Alfa São Francisco', associating random field pairing of male-fertile plants with selected male-sterile plants and PCR-based marker system monitoring S, T and N-cytoplasms. Male-sterile plants produced flowers with light green anthers which were easily detected in the field. A frequency of 2.0% of male-sterile plants was estimated in the 'Alfa São Francisco' sampled population. Male-sterile plants produced the 5'cob-marker 180-bp and the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Allium cepa; CMS; 'Alfa São Francisco'; Tropical hybrid.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000200015

Soil reaction and absorption of silicon by rice
Provedor de dados: 63
Autores: Camargo,Mônica Sartori de; Pereira,Hamilton Seron; Korndörfer,Gaspar Henrique; Queiroz,Angélica Araújo; Reis,Caroline Borges dos.
The solubility and availability of silicon can be influenced by soil reaction. A pot experiment with a clayey textured Rhodic Acrustox was conducted under greenhouse conditions to evaluate the effect of soil reaction on silicon availability to rice plants. The experiment was set up in a completely randomized design, using a factorial scheme (4 x 4) with four materials (calcitic lime, calcium and magnesium silicate, pure silicic acid, and wollastonite), four rates (0, 2500, 5000 and 7500 mg per 5 kg-pot) and four replicates. After 60 days, dry matter yield and silicon absorption by the rice shoot plants, pH CaCl2, and soluble silicon (0.5 mol L-1 acetic acid and 0.01 mol L-1CaCl2) in the soil were evaluated. The materials increased soil pH as the applied...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Oriza sativa; Soil; Calcitic lime; Silicate.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000200011

COMPORTAMENTO DAS SEMENTES DE SOJA DURANTE A FASE INICIAL DO PROCESSO DE GERMINAÇÃO
Provedor de dados: 63
Autores: ROSSETTO,C.A.V; NOVEMBRE,A.D. DA L.C; MARCOS FILHO,J; SILVA,W.R. DA; NAKAGAWA,J.
Com o objetivo de avaliar o comportamento das sementes de soja durante a fase inicial do processo de germinação, utilizaram-se sementes de um lote de soja [Glycine max (L.) Merrill], do cultivar IAC-15, que foram submetidas ao envelhecimento artificial, a 41oC, durante 0, 36 e 42 horas, obtendo-se três diferentes níveis de vigor, designados de lotes 1, 2 e 3, respectivamente. As sementes de cada lote foram submetidas ao umedecimento artificial, a 20oC e 100% de umidade relativa do ar, visando a obtenção de três diferentes teores de água (90, 110 e 130 g de água/kg). Para cada lote, foram verificadas as marchas de absorção de água e efetuadas avaliações da ocorrência de danos por embebição. Assim, sementes com 90, 110 e 130 g de água/kg foram embebidas...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycine max; Soja; Semente; Absorção de água; Danos por embebição.
Ano: 1997
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161997000100015

Selection of Beauveria bassiana and Metarhizium anisopliae isolates for the control of Blissus antillus (Hemiptera: Lygaeidae)
Provedor de dados: 63
Autores: Samuels,Richard Ian; Coracini,Déborah Lucienne Araújo.
Chinch bugs of the genus Blissus (Hemiptera: Lygaeidae) are serious pests of maize, wheat, sorghum and various grasses. This study is the first to screen isolates of Beauveria bassiana and Metarhizium anisopliae against 4th instar and adult Blissus antillus aiming to develop a biological control program for this important pasture pest. Ten fungal isolates were initially screened and three isolates were chosen for further investigation. To determine virulence, insects were inoculated by immersion in concentrations of 5 ´ 10(8) conidia mL-1. Mortality was evaluated for 10 days. B. bassiana ARSEF 792 was the most virulent isolate to both nymphs and adults, causing 53 and 78% infection, respectively, and values for LT50 of 7.8 and 5.0 days, respectively....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brachiaria; Chinch bug; Entomopathogenic fungus; Biological control.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000300005

Contribuição ao estudo da organização agroindustrial: o caso da indústria de frango de corte no Estado de São Paulo
Provedor de dados: 63
Autores: Marques,P.V.
Analisaram-se indicadores de concentração no mercado de abate de frango de corte inspecionado no Estado de São Paulo desde 1978 até 1989. Os índices de concentração de Hirschman-Herfíndahl (H) e os índices de concentração de Gini (G) mostraram tendência estatística de se elevarem com o passar do tempo. O índice de concentração dos quatro maiores frigoríficos (C4) não apresentou tendência estatística para se elevar, enquanto que o índice de concentração das oito e das dezesseis maiores empresas (C8 e C16, respectivamente) mostraram tendência para se elevar a partir de 1980. Concluiu-se que a concentração do mercado de abate e processamento de frangos manteve-se mais ou menos estável com leve tendência a aumentar dos oito menores frigoríficos para baixo....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Frango-corte; Concentração mercado; Organização industrial.
Ano: 1994
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000100002

Antioxidant isoenzyme responses to nickel-induced stress in tobacco cell suspension culture
Provedor de dados: 63
Autores: Pompeu,Georgia Bertoni; Gratão,Priscila Lupino; Vitorello,Victor Alexandre; Azevedo,Ricardo Antunes.
Exposure to nickel (Ni) at high concentrations can lead to production of reactive oxygen species (ROS) resulting in oxidative damage at the cellular level. We investigated the antioxidative responses of Nicotiana tabacum cv BY-2 cell suspension to Ni stress (0.075 and 0.75 mM NiCl2) over a 72 h period with special attention to potential alterations in isoenzymes of superoxide dismutase (SOD), catalase (CAT) and glutathione reductase (GR). Two main SOD isoenzymes were observed, a Mn-SOD (band I) and a Fe-SOD (band II), as well as one CAT isoenzyme and four GR isoenzymes. Activity staining analysis revealed that CAT activity plays a major role in the early response to Ni-induced oxidative stress, particularly when the Ni concentration used was low, whilst a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antioxidant enzymes; Catalase; Nickel; Superoxide dismutase.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000500015

Extraction, partial characterization and susceptibility to Hg2+ of acid phosphatase from the microalgae Pseudokirchneriella subcapitata
Provedor de dados: 63
Autores: Jonsson,Claudio Martín; Aoyama,Hiroshi.
Pseudokirchneriella subcapitata is a unicellular green algae widely distributed in freshwater and soils. Due to its cosmopolitan characteristic, its use is recommended by national and international protocols in ecotoxicity studies. The alteration of phosphatase activities by agriculture pollutants like heavy metals has been extensively used as a biomarker in risk assessment and biomonitoring. In this study, we compared the extraction of acid phosphatase from P. subcapitata by different procedures and we studied the stability, substrates specificity, kinetics and the effect of Hg2+ in the crude extract. The freezing and thawing technique associated with probe sonication was the most suitable method of extraction. The enzyme was stable when frozen at -20ºC...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Selenastrum capricornutum; Algae; Enzyme; Metal; Toxicity.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000500008

Número de ínstares larvais de Tuta absoluta (Meyrick) em genótipos de tomateiro
Provedor de dados: 63
Autores: Giustolin,Teresinha Augusta; Vendramim,José Djair; Postali Parra,José Roberto.
A traça Tuta absoluta (Meyrick) é uma das principais pragas do tomateiro no Brasil e tem sido controlada quase que exclusivamente com inseticidas, o que é indesejável tanto por motivos econômicos quanto ambientais. Esses problemas podem ser minimizados com métodos alternativos de controle, tal como a resistência varietal que é uma alternativa interessante, mas que ainda precisa ser mais estudada. Visando obter mais informações sobre a relação inseto-planta, estudou-se o número de instares da traça em dois genótipos de tomateiro Lycopersicon hirsutum f. glabratum (PI 134417 -- resistente) e L. esculentum (`Santa Clara' - suscetível). O experimento foi desenvolvido em câmara climatizada em duas temperaturas (26 ± 0,5 e 30 ± 0,5ºC). As lagartas...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gelechiidae; Traça-do-tomateiro; Resistência de plantas; Ínstares larvais.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000200028

Novel approach to the selection of Psidium guajava genotypes using latent traits to bypass multicollinearity
Provedor de dados: 63
Autores: Silva,Flavia Alves da; Correa,Caio Cezar Guedes; Carvalho,Beatriz Murizini; Viana,Alexandre Pio; Preisigke,Sandra da Costa; Amaral Júnior,Antônio Teixeira do.
ABSTRACT: Multicollinearity is a very common problem in studies that employ path analysis in agronomic crops, which generates unrealistic results and erroneous interpretations. This study was aimed at assessing the path analysis in data obtained from guava tree full-sib based on modelling multiple regressions applying latent variables to neutralize the effects of multicollinearity. Seven explanatory variables were measured – fruit mass (FM), fruit length (FL), fruit diameter (FD), mesocarp thickness (MT), peel thickness (PT), pulp mass (PM), total number of fruits (NTF) –, plus the main dependent variable, total yield per plant (YIELD). In accordance with the multicollinearity scenario, eleven values were tested with the addition of the constant K to the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: SEM methodology; Trail crest; Correlation.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000200501

Gene silencing: concepts, applications, and perspectives in woody plants
Provedor de dados: 63
Autores: Souza,Amancio José de; Mendes,Beatriz Madalena Januzzi; Mourão Filho,Francisco de Assis Alves.
RNA interference, transcriptional gene silencing, virus induced gene silencing, and micro RNAs comprise a series of mechanisms capable of suppressing gene expression in plants. These mechanisms reveal similar biochemical pathways and appear to be related in several levels. The ability to manipulate gene silencing has produced transgenic plants able to switch off endogenous genes and invading nucleic acids. This powerful biotechnological tool has provided plant breeders and researchers with great opportunity to accelerate breeding programs and developmental studies in woody plants. This research work reports on gene silencing in woody plants, and discuss applications and future perspectives.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: RNAi; MiRNA; SiRNA; Genetic transformation; Virus resistance.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000600014

Soil microbial and chemical properties influenced by continuous cropping of banana
Provedor de dados: 63
Autores: Sun,Jianbo; Zou,Liangping; Li,Wenbin; Wang,Yuguang; Xia,Qiyu; Peng,Ming.
ABSTRACT: The impacts of continuous cropping of banana on soil microbiological and biochemical properties are little understood. In this study, we evaluated the variations in soil bacterial community abundance and diversity, microbial biomass carbon (MBC) and nitrogen (MBN) as well as soil enzyme activities involved in C, N and P cycles as affected by continuous cropping of banana. An initial increase in bacterial 16S rRNA copy and soil microbial biomass was observed in the second cropping and then decreased until the fourth cropping. The diversity of bacterial community showed a continuous decrease throughout the experiment. In addition, continuous cropping of banana caused shifts in bacterial community composition and structures. Soil urease and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Rhizosphere; Soil bacterial abundance; Bacterial community diversity; Soil microbial biomass; Soil enzymes.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162018000500420

Tensile strength and friability of an Alfisol under agricultural management systems
Provedor de dados: 63
Autores: Reis,Diony Alves; Lima,Claudia Liane Rodrigues de; Pauletto,Eloy Antonio; Dupont,Patricia Bianca; Pillon,Clenio Nailto.
Management systems may influence the structural quality of soils. Tensile strength (TS) and friability (F) are indicators of soil structural quality. The aim of this study was to evaluate the TS and F of an Alfisol under different management systems. The treatments were as follows: (i) soil under conventional system with growing maize after tobacco cultivation, (ii) soil under conventional system with growing maize after use as pasture, (iii) soil under natural pasture, and (iv) a natural area with predominance of spontaneous vegetation. TS and F were evaluated at depths of 0.00-0.05 and 0.05-0.10 m. The water content of soil aggregates, soil particle-size distribution, total organic carbon, carbon in the coarse fraction and carbon associated with minerals...
Tipo: Info:eu-repo/semantics/article
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162014000200012

Evolution of research on recalcitrant seeds
Provedor de dados: 63
Autores: Barbedo,C.J.; Bilia,D.A.C.
Some comments about seeds that show sensitivity to desiccation and short viability period, called recalcitrants, were made. Further studies showed that there was a gradient of sensitivity to desiccation and an intermediate class was proposed. The research demonstrated different factors related to desiccation tolerance such as ABA, proteins and sugars. It was analyzed the research of recalcitrant seeds in Brazil, that started around 1950 and nowadays the major aspects studied are recalcitrant seeds identification, seed low temperature and drying tolerance, storage capacity under different rooms and packages, chemical composition and viability during storage, fungicide treatment efficiency on seed conservation.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Seed; Recalcitrant; Desiccation tolerance; Brazil.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000500022

Investigation of Leptin gene in broiler and layer chicken lines
Provedor de dados: 63
Autores: Ninov,Kerli; Ledur,Mônica Corrêa; Alves,Helena Javiel; Rosário,Millor Fernandes do; Nones,Kátia; Coutinho,Luiz Lehmann.
Leptin, a polypeptide hormone secreted mainly by adipose tissue, plays an important role in feed intake regulation, energy metabolism and reproduction in several species. Its function has been intensively studied in mammals; however, in birds limited information is available. The cDNA sequence for chicken leptin has been reported, and high hepatic expression levels of leptin were associated with fat deposition in selected bird lines. However, controversies still remain concerning to the chicken leptin gene and several authors failed to amplify this gene from genomic DNA or cDNA. In view of this controversy and the importance of this gene, the present study aimed to investigate the leptin gene in a population of birds developed by Embrapa Swine and Poultry...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gallus gallus; Fat deposition; Primer design.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000200016

Germinação de sementes de alface submetidas a condicionamento osmótico durante o armazenamento
Provedor de dados: 63
Autores: Fessel,Simone Aparecida; Vieira,Roberval Daiton; Rodrigues,Teresinha de Jesus Deléo; Fagioli,Marcelo.
Em algumas espécies a técnica do condicionamento osmótico permite a obtenção de uma germinação rápida e uniforme. A pesquisa teve por objetivo verificar a eficiência do condicionamento osmótico de sementes de alface sobre a sua germinação. Sementes dos cultivares Mesa 659, Nabuco RS e Verônica, com dois níveis de viabilidade, foram submetidas ao condicionamento osmótico em solução (0,35 mol) de manitol por períodos de 3, 4, 5 e 6 dias sob 20ºC e em presença de luz. A seguir, as sementes foram submetidas à secagem (32ºC) por 12 horas em estufa com circulação de ar. As avaliações foram feitas pelo teste padrão de germinação aos 0, 10, 20, 30, 60 e 90 dias após o condicionamento e secagem das sementes. Utilizou-se o delineamento experimental inteiramente...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lactuca sativa; Manitol.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000100011

EFEITO DA ATMOSFERA CONTROLADA NA CONSERVAÇÃO DE TOMATES COLHIDOS EM ESTÁDIO INTERMEDIÁRIO DE MATURIDADE
Provedor de dados: 63
Autores: Moura,Márcia Lima; Sargent,Steven A.; Oliveira,Ricardo Ferraz de.
Tomates (cv. "Agriset"), colhidos no estádio 2 de maturidade (menos de 10% da superfície vermelha), foram armazenados a 12 ± 0,5ºC em um sistema de fluxo contínuo sob diferentes concentrações de O2 (2%, 3% e 4%), CO2 (2%, 4% e 7%) e ar (controle). Após o armazenamento em atmosfera controlada (AC), a 12 ± 0,5ºC por 7 dias, os frutos foram transferidos para a temperatura de 20 ± 0,5ºC de modo a permitir o término do processo de amadurecimento em atmosfera normal. Quando os tomates começaram a perder a firmeza foram realizadas análises físicas e químicas. De um modo geral, o armazenamento de tomates no estádio 2 de maturidade em AC por 7 dias não alterou a qualidade final do produto - quando completamente maduro - estes frutos apresentaram mesma cor, acidez e...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Tomate (Lycopersicon esculentum); Atmosfera controlada; Estádio de maturidade.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000100020

EFEITO DO ÁCIDO INDOLBUTÍRICO NO ENRAIZAMENTO DE ESTACAS DE LARANJEIRA CV. VALÊNCIA (Citrus sinensis (L.) OSBECK) SOB CONDIÇÕES INTERMITENTES DE NEBULIZAÇÃO
Provedor de dados: 63
Autores: ROSSAL,P.A.L; KERSTEN,E.
Para avaliar o efeito de cinco concentrações de IBA utilizou-se os substratos areia lavada e cinza de casca de arroz, no enraizamento de estacas cilíndricas e triangulares de laranjeira cv. valência, coletadas em três épocas do ano. Os resultados mostraram que os tratamentos não influenciaram a formação de raízes; a areia foi o melhor substrato para formação de calos sendo a melhor concentração, 4500ppm de IBA para estacas cilíndricas coletadas em maio.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Enraizamento; Estaca; Citrus sinensis; IBA; Rooting; Cutting; Citrus sinensis; IBA.
Ano: 1997
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161997000100002

Gênese de ferri-argilãs em horizontes B texturais de uma seqüência de solos sobre diabásio em Piracicaba (SP)
Provedor de dados: 63
Autores: Cooper,Miguel; Vidal-Torrado,Pablo.
Numa sequência de solos sobre diabásio localizada no campus da USP em Piracicaba a formação de ferri-argilãs e os processos de adensamento foram estudados. Foram realizados estudos morfológicos, micromorfológicos, de microscopia eletrônica de varredura e microanálise em amostras retiradas de três trincheiras localizadas nesta sequência. A presença de ferri-argilãs de iluviação foi observada nos horizontes B textural e na alterita principalmente preenchendo a porosidade mamelonar, policôncava e fissural provocando o adensamento dos mesmos. Evidências de hidromorfia temporária sugeriram que este processo estaria provocando a desestabilização das ligações ferro-argila facilitando assim a mobilização e redistribuição do ferro e da argila.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Terra Roxa Estruturada; Horizonte Bt; Cutãs de iluviação; Hidromorfia temporária; Adensamento.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000400024

DRIS: concepts and applications on nutritional diagnosis in fruit crops
Provedor de dados: 63
Autores: Mourão Filho,Francisco de Assis Alves.
Nutrition and fertilization are important factors in determining fruit yield and fruit quality. There are several methods for plant nutritional status diagnosis, among them, two are relevant and named as Sufficiency Range Approach (SRA) and Diagnosis and Recommendation Integrated System (DRIS). This research reports the main concepts and applications of DRIS in nutritional diagnosis of fruit crops, comparing it with current nutritional diagnosis methods, indicating advantages and disadvantages, and possible limitations to be investigated.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Foliar analysis; Fruit crops; Mineral nutrition.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000500015

Microbial enzymatic activity and thermal effect in a tropical soil treated with organic materials
Provedor de dados: 63
Autores: Cenciani,Karina; Freitas,Sueli dos Santos; Critter,Silvana Auxiliadora Missola; Airoldi,Cláudio.
Bacteria and fungi are the most active decomposers of organic materials in soil. They directly affect plant nutrient availability, and chemical and physical properties of soils. This investigation aimed at quantifying the effect of several organic materials on microbial activity of a Rhodic Eutrudox. Soil samples were incubated over a period of 91 days with the following organic materials: cattle manure (CM), earthworm humus (HM), and city sewage sludge from Barueri (BA) and Franca (FR). The activities of cellulase, protease and urease enzymes, the soil microbial carbon content (by fumigation-extraction method) and the exothermal effect were evaluated. Experimental design was randomized and arranged as factorial scheme five treatments x seven samplings...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Enzymes; Biomass carbon; Organic materials; Soil microorganisms; Microcalorimetry.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000600016

Sensory acceptance of mixed nectar of papaya, passion fruit and acerola
Provedor de dados: 63
Autores: Matsuura,Fernando César Akira Urbano; Folegatti,Marília Ieda da Silveira; Cardoso,Ricardo Luís; Ferreira,Daniel Costa.
Nectars are beverages formulated with the juice or pulp of one or more fruits, plus water and sugar in concentrations resulting in a "ready-to-drink" product. Recently, the market for such products has greatly expanded. Fruit mixtures present a series of advantages, such as the combination of different aromas and flavors and the sum of their nutritional components. The objective of this work was to develop a nectar based on papaya pulp and passion fruit juice, enriched with the vitamin C present in acerola pulp, optimizing the formulation using sensory consumer tests and a response surface statistical methodology. Eleven formulations were prepared using different concentrations of papaya pulp and passion fruit juice and sucrose, and maintaining the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Beverage; Ready-to-drink; Tropical fruit; Blend.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000600007

Enriching nutritive value of cassava root by yeast fermentation
Provedor de dados: 63
Autores: Boonnop,Krisada; Wanapat,Metha; Nontaso,Ngarmnit; Wanapat,Sadudee.
Cassava (Manihot esculenta) is extensively cultivated throughout the tropics and subtropics regions due to its ability to grow in diverse soil conditions and minimal management. Experiments were made to study the cassava root fermentation by yeasts in order to enhance the nutritive value of their products (fresh pulp and chips). Both cassava chip (CC) and fresh cassava root pulp (FCR) samples were fermented by Saccharomyces cerevisiae in solid-liquid media fermentation conditions during 132 hours and dried at 30ºC. Products were analyzed for proximate composition, mineral composition, essential aminoacids and antinutrient content. There were increases (p &lt; 0.01) in protein (30.4% in CC and 13.5% in fermented cassava root -FCR) and fat contents (5.8% in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Saccharomyces cerevisiae; Fermentation; Cassava chip; Fresh cassava root pulp; Protein; Animal feed.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000500007

Genetic diversity assessment in sorghum accessions using qualitative morphological and amplified fragment length polymorphism markers
Provedor de dados: 63
Autores: Gerrano,Abe Shegro; Labuschagne,Maryke Tine; van Biljon,Angeline; Shargie,Nemera Geleta.
Qualitative morphological and amplified fragment length polymorphism (AFLP) markers were compared for assessment of genetic diversity. Nine qualitative morphological traits were recorded to compare genetic relationships among 17 sorghum accessions with information derived from six AFLP primer combinations analysis. The mean morphological genetic similarity was lower in comparison to similarity computed using AFLP markers. Genetic similarity measured by AFLP markers was similar within the Ethiopian and South African material, as well as between South African and Ethiopian material. Morphological similarity was much higher in the Ethiopian material than in the South African material, indicating that the genotypes were related. The two techniques described...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dice similarity coefficient; Genetic distance; Marker; Trait.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162014000500008

Carcass characteristics and fatty acid profile of Santa Inês lamb fed banana leftovers
Provedor de dados: 63
Autores: Menezes,Adriana Morato de; Tanure,Candice Bergmann Garcia e Silva; Peripolli,Vanessa; Esteves,Geisa Isilda Ferreira; Kindlein,Liris; Louvandini,Helder; Souza,Jurandir Rodrigues de; McManus,Concepta.
ABSTRACT: The use of new feed resources, particularly local agroindustrial byproducts, such as banana, may be an option for replacing those traditionally used for sheep feed to reduce production costs. Thus, the aim of this study was to evaluate the dietary effects of replacing corn bran with banana leftovers on performance, carcass, non-carcass components, meat traits, and fatty acid profile of Santa Inês lambs. Twenty-four Santa Inês female lambs with an average weight of 23.73 kg were fed diets containing 60 % coast cross hay and 40 % concentrate (30 % corn bran and 10 % soybean meal). Treatments consisted of corn bran replaced by banana leftovers at rates of 0, 25, 50, and 75 % on a dry matter basis. The experiment lasted 120 days. Animals were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Byproducts; Meat quality; Non-carcass components; Sustainability.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000100400

Thermal performance of sisal fiber-cement roofing tiles for rural constructions
Provedor de dados: 63
Autores: Tonoli,Gustavo Henrique Denzin; Santos,Sérgio Francisco dos; Rabi,José Antonio; Santos,Wilson Nunes dos; Savastano Junior,Holmer.
Roofing provides the main protection against direct solar radiation in animal housing. Appropriate thermal properties of roofing materials tend to improve the thermal comfort in the inner ambient. Nonasbestos fiber-cement roofing components reinforced with cellulose pulp from sisal (Agave sisalana) were produced by slurry and dewatering techniques, with an optional addition of polypropylene fibers. Nonasbestos tiles were evaluated and compared with commercially available asbestos-cement sheets and ceramic tiles (frequently chosen as roofing materials for animal housing). Thermal conductivity and thermal diffusivity of tiles were determined by the parallel hot-wire method, along with the evaluation of the downside surface temperature. Cement-based...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cellulose pulp; Polypropylene fiber; Thermal comfort; Parallel hot-wire method; Thermal conductivity.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000100001

Herança de formato e produção de frutos imaturos em abobrinha (Cucurbita moschata)
Provedor de dados: 63
Autores: Cardoso,A.I.I.; Silva,N.; Zanotto,M.D.; Della Vecchia,P.T.
O objetivo deste trabalho foi determinar a herança de formato e produção de frutos imaturos de 2 novas linhagens de C. moschata. Para tal obtiveram-se as gerações Fl, F2 e retrocruzamentos para ambos os progenitores. Para a avaliação das diferentes gerações utilizou-se o delineamento em blocos ao acaso com 4 repetições e número variável de plantas por repetição. As estimativas dos parâmetros genéticos foram obtidas segundo o modelo de MATHER &amp;amp; JINKS. Foram avaliados o peso, comprimento e diâmetros próximos das extremidades peduncular e estilar dos frutos. Observou-se dominância para maior velocidade de crescimento dos frutos, caracterizada pelos maiores comprimentos, diâmetros e peso médio na geração F1. Observou-se também dominancia para frutos...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Abobrinha/C moschata; Herança; Formato de fruto; Produção.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000300022

Factors affecting forage stand establishment
Provedor de dados: 63
Autores: Sulc,R.M.
Significant advances have been made in our knowledge of forage seed physiology, technology, and stand establishment practices; however, stand establishment continues to be one of the most common production problems affecting forage crops in the USA. There is a need for research on stand establishment of forage crops under abiotic and biotic stress. Although the forage seed industry produces and markets seed of high quality, new methods of assessing seed vigor are needed and their use should be expanded in the industry to enable matching seed lot performance to specific environmental conditions where performance can be maximized. Seed treatment and seed coating are used in the forage seed industry, and studies have shown they are of benefit in some...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Planting; Seed coating; Seed quality; Seed treatment; Seed vigor.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000500020

Genetic evaluation of grain sorghum hybrids in Brazilian environments using the REML/BLUP procedure
Provedor de dados: 63
Autores: Almeida Filho,Janeo Eustáquio de; Tardin,Flávio Dessaune; Resende,Marcos Deon Vilela de; Silva,Fabyano Fonseca e; Granato,Ítalo Stefanine Correia; Menezes,Cicero Beserra de.
When it comes to recommending sorghum (Sorghum bicolor) cultivars, it is essential to carry out a genetic evaluation of the agronomic traits of promising genotypes from several common environments where the crop is cultivated. This study consisted of a genetic evaluation of 52 experimental grain sorghum hybrids and eight commercial cultivars. Hybrids were evaluated in 19 experiments representing the most varied cultivation conditions in Brazil. Traits of agronomic interest such as grain yield, flowering and plant height were analysed. Genotypic evaluation was performed following the REML/BLUP (Restricted Maximum Likelihood/Best Linear Unbiased Predictor) procedure; the MHPRVG (Harmonic Mean of Relative Performance of Genotypic Values) method was also...
Tipo: Info:eu-repo/semantics/article
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162014000200009

Methane mitigation and ruminal fermentation changes in cows fed cottonseed and vitamin E
Provedor de dados: 63
Autores: Nogueira,Ricardo Galbiatti Sandoval; Perna Junior,Flavio; Pereira,Angélica Simone Cravo; Cassiano,Eduardo Cuellar Orlandi; Carvalho,Roberta Ferreira; Rodrigues,Paulo Henrique Mazza.
ABSTRACT: Inherently, ruminant production of methane (CH4), a greenhouse gas (GHG), causes animal energy losses. Cottonseed is a lipid source and is used sometimes to enhance energy density in cattle diets. It also can mitigate enteric CH4. Lipids release peroxides in the rumen, and antioxidants have the ability to neutralize them. Thus, a lipid and antioxidant source can benefit rumen fermentation. The aim of this study was to evaluate rumen fermentation parameters from cows fed cottonseed and vitamin E. Six cannulated cows were arranged in a replicate 3 × 3 latin square. Treatments were: 1) Control, 2) CS (30 % corn replaced by cottonseed) and 3) CSVitE (30 % corn replaced by cottonseed, plus 500 IU VitE). Results were compared by orthogonal contrast....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: SCFA; Enteric methane; Oilseed; Antioxidant.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000600401

Fertilizer distribution mechanisms and side dress nitrogen fertilization in upland rice under no-tillage system
Provedor de dados: 63
Autores: Crusciol,Carlos Alexandre Costa; Costa,André de Moraes; Borghi,Émerson; Castro,Gustavo Spadotti Amaral; Fernandes,Dirceu Maximino.
Some crops have shown not to adapt to the no-tillage system (NTS) as a consequence of the compaction of the superficial soil layer. In a certain way, the mechanism used in seeders to open furrows for the deposition of fertilizers can have great importance in facilitating root penetration. This study was carried out to evaluate the influence of two fertilizer distribution mechanisms and N fertilization in upland rice (Oryza sativa) under NTS. The experiment was carried out in the growing seasons 2001/2002 and 2002/2003, in Botucatu, state of São Paulo, Brazil. A completely randomized block design was applied, with subdivided plots and four replications. Main plots consisted of two furrow opening mechanisms (furrow opener and double disk). Subplots consisted...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Oryza sativa L.; Furrow opener; Double disk; N doses.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000500010

Rice herbicide monitoring in two Brazilian rivers during the rice growing season
Provedor de dados: 63
Autores: Marchesan,Enio; Zanella,Renato; Avila,Luis Antonio de; Camargo,Edinalvo Rabaioli; Machado,Sérgio Luiz de Oliveira; Macedo,Vera Regina Mussoi.
Irrigated rice production can involve environmental contamination with pesticides due to the proximity of the fields to rivers and to management problems. During three years (2000 to 2003) the rice herbicides clomazone, propanil and quinclorac were quantified in water during the rice growing season, in the Vacacaí and Vacacaí-Mirim Rivers, located in Rio Grande do Sul (RS) State, Brazil. Water samples were taken at several locations in each river, selected by their importance in terms of rice drainage area. The samples were analyzed by HPLC-UV. At least one herbicide was detected in 41% of the samples from the Vacacaí River and 33% from the Vacacaí-Mirim River. The most frequent herbicide in both rivers and in each year was clomazone. The amount of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Clomazone; Environmental impact; Pesticides; Propanil; Quinclorac.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000200005

Seleção de espigas e debulha das sementes de milho (Zea mays L.): I- efeitos sobre a qualidade física e infestação por insetos
Provedor de dados: 63
Autores: Sato,O.; Cícero,S.M.
O presente trabalho, teve como objetivo verificar os efeitos da seleção de espigas e da debulha das sementes de milho, realizada no campo e na unidade de beneficiamento de sementes, sobre a qualidade física e infestação por insetos. Para tanto, foram utilizadas sementes de quatro campos de produção de sementes fiscalizadas da safra 1985/86. As espigas amostradas, foram submetidas às debulhas manual e mecânica (debulhador estacionário acoplado ao trator no próprio local de produção e debulhador da unidade de beneficiamento de sementes da companhia produtora), com e sem seleção de espigas. Os resultados obtidos mostraram que as sementes provenientes da debulha realizada mecanicamente no campo apresentaram maior incidência de danos mecânicos. A seleção das...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Milho; Seleção de espigas; Debulha; Dano mecânico; Infestação por insetos.
Ano: 1992
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161992000400013

Desempenho de híbridos de milho com ciclos contrastantes em função da desfolha e da população de plantas
Provedor de dados: 63
Autores: Sangoi,Luís; Almeida,Milton Luiz de; Lech,Vanderlei Adilson; Gracietti,Luiz Carlos; Rampazzo,Clair.
A velocidade com que o milho se desenvolve da emergência até a antese pode interferir na determinação de práticas de manejo importantes para a cultura, bem como na sua capacidade de tolerar estresses na floração. Este trabalho foi conduzido objetivando determinar a relação existente entre precocidade e a resposta de híbridos de milho ao incremento na população de plantas e à redução de área foliar. O experimento foi conduzido em Lages, SC, durante o ano agrícola de 1999/2000. Foram testados três híbridos contrastantes em exigência calórica para florescimento: P32R21, super precoce; Premium, precoce; e C333B, tardio. Foram estudadas quatro densidades: 25.000, 50.000, 75.000 e 100.000 pl ha-1. Os genótipos foram avaliados com sua área foliar intacta e com...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays; Fonte; Dreno; Remobilização.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000200009

Sistemas de resfriamento evaporativo e o desempenho de frangos de corte
Provedor de dados: 63
Autores: Sartor,Valmir; Baêta,Fernando da Costa; Luz,Maira Luciana; Orlando,Roberto Carlos.
As condições térmicas no interior de instalações para frangos de corte tem importância vital para o sucesso desta atividade. Desta forma, deve-se buscar o conforto térmico para as aves com o mínimo custo em materiais, equipamentos e energia. Baseado nisto foi desenvolvido um trabalho com o objetivo de avaliar o efeito de três sistemas de resfriamento evaporativo no desempenho de frangos de corte. Para isso, utilizou-se um galpão dividido em quatro partes nas quais foram instaladas os tratamentos: ventilador associado a nebulização (VNB), ventilador de alta rotação associado a nebulização (VNA), nebulização (NEB) e nebulização acoplada ao ventilador (NEV). Foi registrado o consumo de ração, o ganho de peso e a mortalidade, obtendo-se assim a conversão...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ambiente térmico; Conforto térmico; Ventilação; Aviário.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000100003

Genetic variation and realized genetic gain from rubber tree improvement
Provedor de dados: 63
Autores: Gonçalves,Paulo de Souza; Aguiar,Adriano Tosoni da Eira; Costa,Reginaldo Brito da; Gonçalves,Elaine Cristine Piffer; Scaloppi Júnior,Erivaldo José; Branco,Roberto Botelho Ferraz.
Breeding cycle in rubber extends to 20-30 years between pollination and yield assessment, distributed over three selection stages. Five hectares of small scale trial of rubber tree [Hevea brasiliensis (Willd. ex Adr. de Juss.) Muell.-Arg.], was established in the Northwestern region of São Paulo State, Brazil. The population comprises 98 clones mostly derived from intensively selected plus tree in the natural forest of rubber tree in the Amazon. Three open pollinated progeny tests were established in three experimental stations. Seedlings from 98 progenies including a commercial check (CC) were planted in each one of the three locations. Assessments were made when the plants were one, two and three years old. The variation among progenies for girth was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hevea brasiliensis; Variance; Covariance; Heritability correlation; Genetic test.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000100006

Sensitivity of seed to desiccation in cupuassu (Theobroma grandiflorum (Willd. ex Spreng.) K. Schum. - sterculiaceae
Provedor de dados: 63
Autores: Cruz,Eniel David; Cicero,Silvio Moure.
The response of seeds to reduction in moisture content will determine whether they can be stored by conventional methods. The objective of this study was to verify the effect of desiccation on the germination and vigor of cupuassu (Theobroma grandiflorum (Willd. ex Spreng.) K. Schum.) seeds, a tropical fruit species. The following seed moisture contents (SMC) were tested: 57.1%, 53.7%, 49.8%, 46.5%, 41.4%, 35.4%, 28.3%, 23.2%, 17.4%, 15.5% and 14.6%. Desiccation of seeds to as low as 41.4% (SMC) did not affect emergence, germination or vigor. However, reductions in speed of emergence were observed below 41.4%. When SMC was equal or lower than 35.4% a reduction in seed quality was observed. Loss of seed quality was increased when moisture content was equal...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Deterioration; Dehydration; Drying; Physiological quality.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000500017

Sustainable alternative for the food industry: converting whey and orange juice into a micro-filtered beverage
Provedor de dados: 63
Autores: Fagnani,Rafael; Puppio,Ana Amélia Nunes; Zanon,Emely Osti.
ABSTRACT: Enhancing industrial sustainability by converting whey into alternative high value-added products is a scientific trend in food science and technology. However, without other ingredients, rennet, or sour, whey has an unappetizing flavor. This sensory challenge can be overcome by blending it with citrus flavor from orange juice. This study assessed a micro-filtered beverage from whey and orange juice without enzymatic treatment. Four formulations (27:10, 8.6:10, 2.4:10 and 1:10 v/v whey:juice ratio) were processed through a 1.4 μm microfiltration system with four different transmembrane pressures (1, 2, 3, and 4.15 bar) and then stored at 5 °C for 28 days. The micro-filtered beverage was analyzed for physicochemical, sensorial and microbial...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Membrane; Dairy; Fruit; Fouling; Sensory evaluation.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162018000200136

Rock biofertilizer and earthworm compost on sugarcane performance and soil attributes in two consecutive years
Provedor de dados: 63
Autores: Stamford,Newton Pereira; Simões Neto,Djalma Eusébio; Freitas,Ana Dolores Santiago de; Oliveira,Emídio Cantídio Almeida; Oliveira,Wagner Silva; Cruz,Leila.
ABSTRACT The deployment of soluble fertilizers has been one of the most commonly applied agricultural practices in the bid to increase crop yield. However, the production of soluble fertilizers has a considerable economic cost and consumes a substantial amount of energy. In general, soil organic matter provides the nutrients needed for plant growth in organic agriculture. However, these nutrients are not sufficient if the best yield is to be obtained. The aim of our field experiment was to evaluate the effectiveness of phosphate and potassic sources (rocks, bio-fertilizers and soluble fertilizers) based on several sugarcane characteristics and soil attributes. Our experiment was conducted over two consecutive years, and we assessed the effect of using...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Acidithiobacillus; Organic fertilization; Organic matter; Soil nutrients; Sulfur oxidation.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000100029

Cover crop rotations in no-till system: short-term CO2 emissions and soybean yield
Provedor de dados: 63
Autores: Rigon,João Paulo Gonsiorkiewicz; Calonego,Juliano Carlos; Rosolem,Ciro Antonio; Scala Jr.,Newton La.
ABSTRACT: In addition to improving sustainability in cropping systems, the use of a spring and winter crop rotation system may be a viable option for mitigating soil CO2 emissions (ECO2). This study aimed to determine short-term ECO2 as affected by crop rotations and soil management over one soybean cycle in two no-till experiments, and to assess the soybean yields with the lowest ECO2. Two experiments were carried out in fall-winter as follows: i) triticale and sunflower were grown in Typic Rhodudalf (TR), and ii) ruzigrass, grain sorghum, and ruzigrass + grain sorghum were grown in Rhodic Hapludox (RH). In the spring, pearl millet, sunn hemp, and forage sorghum were grown in both experiments. In addition, in TR a fallow treatment was also applied in the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycine max (L.) Merrill; Carbon equivalent; Crop residue; Management system.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162018000100018

Soil morphostructural characterization and coffee root distribution under agroforestry system with Hevea Brasiliensis
Provedor de dados: 63
Autores: Nunes,Amanda Letícia Pit; Cortez,Glassys Louise de Souza; Zaro,Geovanna Cristina; Zorzenoni,Thiago Ometto; Melo,Thadeu Rodrigues de; Figueiredo,Alex; Aquino,Gisele Silva de; Medina,Cristiane de Conti; Ralisch,Ricardo; Caramori,Paulo Henrique; Guimarães,Maria de Fátima.
ABSTRACT: Land use and tillage practices may change soil structure and undermine sustainable agriculture; however, such changes are hardly identified in the short term. In this sense, agroforestry systems have been used to reduce soil degradation and promote sustainable production in coffee plantations. These areas are expected to have well-structured soils and hence improved root distribution. This study aimed to evaluate soil quality by the morphostructural and root distribution analyses comparing open-grown coffee and coffee in agroforestry systems with rubber trees for 19 years, in an Oxisol in northern Paraná State (Brazil). Treatments consisted of open-grown coffee (OG), coffee partially shaded by rubber trees (PSH), and coffee fully shaded by rubber...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cultural profile; Soil physics; Compaction; Penetrometry; Rubber treepoint of zero charge.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000601401

Energy generation in a Microbial Fuel Cell using anaerobic sludge from a wastewater treatment plant
Provedor de dados: 63
Autores: Passos,Vinicius Fabiano; Aquino Neto,Sidney; Andrade,Adalgisa Rodrigues de; Reginatto,Valeria.
ABSTRACT In microbial fuel cells (MFCs), the oxidation of organic compounds catalyzed by microorganisms (anode) generates electricity via electron transfer to an external circuit that acts as an electron acceptor (cathode). Microbial fuel cells differ in terms of the microorganisms employed and the nature of the oxidized organic compound. In this study, a consortium of anaerobic microorganisms helped to treat the secondary sludge obtained from a sewage treatment plant. The microorganisms were grown in a 250 mL bioreactor containing a carbon cloth. The reactor was fed with media containing acetate (as the carbon source) for 48 days. Concomitantly, the electrochemical data were measured with the aid of a digital multimeter and data acquisition system. At the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Microbial consortia; Anode; Power density; Effluent.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000500424

Minas-type fresh cheese developed from buffalo milk with addition of L. acidophilus
Provedor de dados: 63
Autores: Marcatti,Bruna; Habitante,Ana Mônica Quinta Barbosa; Sobral,Paulo José do Amaral; Favaro-Trindade,Carmen Sílvia.
Effective incorporation of a probiotic into foods requires the culture to remain viable all along processing and storage, without adverse alterations to sensory characteristics. The objective of this work was developing Minas-type fresh cheese with probiotic properties from buffalo milk. Four batches of Minas-type fresh cheese were prepared using buffalo milk: batch T1 in which neither culture nor lactic acid added; batch T3 in which only lactic acid added; batches T2 and T4 , both added of Lactobacillus acidophilus LAC 4, but T4 was also acidified. Resulting cheeses were evaluated for probiotic culture stability, texture profile, sensory acceptance, and changes in pH. The T4 probiotic cheese presented hardness, gumminess, and chewiness significantly lower...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lactobacillus acidophilus; Probiotic viability; Sensory evaluation; Texture.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000400008

Diversity and characterization of ramie-degumming strains
Provedor de dados: 63
Autores: Duan,Shengwen; Liu,Zhengchu; Feng,Xiangyuan; Zheng,Ke; Cheng,Lifeng; Zheng,Xia.
Ramie (Boehmeria nivea and Boehmeria tenacissima) is a widely used fiber crop. Traditional water retting or chemical boiling method performed in order to extract ramie fiber seriously pollute the environment and severely damage the fiber, so biological method is the general trend of the fiber-extracting industry. Some strains (687), involving 26 genera and 43 species, were collected from the three samples, which produce hydrolyzed circles in the selective culture medium in order to detect the degumming effect and to compare the enzyme activity. Among these strains, 13 of them did not produce cellulase and had a ramie decreasing weight rate above 25 %, which were regarded as efficient ramie-degumming strains named from R1 to R13. R1 to R13 belonged to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fiber; Bio-extracting; Microorganism; Resource.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162012000200006

Lead sorption and leaching from an Inceptisol sample amended with sugarcane vinasse
Provedor de dados: 63
Autores: Ribeiro,Bruno Teixeira; Lima,José Maria de; Guilherme,Luiz Roberto Guimarães; Julião,Luiz Gustavo Fernandes.
Vinasse is produced at high amounts by the ethanol and sugarcane spirits industries. Although the effects of vinasse on soil attributes are well elucidated, little is known about its effects on sorption and leaching of lead (Pb) from soils. This work evaluated the Pb sorption and leaching from disturbed topsoil samples (0-20 cm) of an Inceptisol, under the influence of sugarcane vinasse. Pb sorption was evaluated by batch sorption method, using air-dried samples (&lt; 2 mm) treated with pure (100%), and diluted (20%, and 50%) vinasse. The amended soil samples were further reacted with 0.05; 0.10; 0.25; 0.50, and 0.75 mmol L-1 of Pb. To measure the Pb leached, soil columns were packed in PVC tubes, 12-cm long with 4-cm internal diameter filled with 200 g of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sugarcane cultivation; Organometallic complexes; Organic waste; Pb mobility.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000400011

The effect of feed supplementation on the onset of puberty in Brazilian dairy heifers
Provedor de dados: 63
Autores: Meirelles,C.F.; Abdalla,A.L.; Vitti,D.M.S.S.
Most Brazilian dairy production is conducted by small holders whose general management skills and feeding programs are often deficient. One common problem directly attributed to underfeeding is that heifers rarely reach sexual maturity before 15 months of age. Groups of growing heifers were treated to detect the effects of protein supplementation and antihelmintic treatment on sexual maturity. The first ovulation occurred at 513 ± 44 and 573 ± 36 days (P&lt;.01) in supplemented and control groups, respectively. Liveweight gains from start of the trial to the first ovulation were 378 ±.02 and 331 ±.04 g for suplemented (S) and control (C) groups. Only 52.17 % of heifers in C group (11 of 23) but 95.65 % in S group (22 of 23) reached sexual maturity before...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Heifers; Puberty; Protein supplementation; Antihelmintic.
Ano: 1994
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000200026

Determinants of farmers’ adaptation to climate change: A micro level analysis in Ghana
Provedor de dados: 63
Autores: Ndamani,Francis; Watanabe,Tsunemi.
ABSTRACT This study analyzed socio-economic factors that influence farmers’ adaptation to climate change in agriculture. Perceptions regarding long-term changes in climate variables and the rate of occurrence of weather extremes were also investigated. Additionally, farmers’ perceived barriers to the use of adaptation practices were identified and ranked. A total of 100 farm-households were randomly selected from four communities in the Lawra district of Ghana and data were collected through semi-structured questionnaires, focused group discussions and field observations. A logistic regression model and weighted average index were used to analyze the data. The results showed that 87 % of respondents perceived a decrease in rainfall amount, while 82 %...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Perceptions; Socio-economic; Agriculture; Climate effects.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000300201

Compatibility between the entomopathogenic fungus Beauveria bassiana and insecticides used in coffee plantations
Provedor de dados: 63
Autores: Oliveira,Carolina Natali de; Neves,Pedro Manuel Oliveira Janeiro; Kawazoe,Lídio Sueki.
Microbial control in integrated pest management (IPM) programs of coffee plantations is an important factor for the reduction of pest population densities. The use of selective pesticides can be associated with entomopathogens, increasing the efficiency of the control and reducing the use of required insecticides. The in vitro fungitoxic effect of insecticide formulations of Thiamethoxam, Cyfluthrin, Deltamethrin, Alpha-Cypermethrin, Triazophos, Chlorpyrifos, Fenpropathrin and Endosulfan and Beauveria bassiana (CG 425 strain) was evaluated at three concentrations (FR = average field recommendation; 0.5 ´ FR and 2 ´ FR). Effects of these products on conidia germination, vegetative growth and sporulation were compared. Only five insecticides, at the FR...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Microbial control; Toxic effect; Pesticides.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000400009

Biological aspects of the immature stages of Ceraeochrysa everes (Banks) (Neuroptera: Chrysopidae)
Provedor de dados: 63
Autores: Barbosa,Leonardo Rodrigues; Freitas,Sérgio de; Auad,Alexander Machado.
A knowledge of the behavior and biological aspects of natural enemies is extremely important for the establishment of biological control programs. Biological aspects of the larvae, pre-pupae and pupae of the predator Ceraeochrysa everes (Banks) were studied. Larvae of the adult F1 generation were reared in the laboratory (25 ± 2°C, 65 ± 10 % RH and 14h photophase) on eggs of the Angoumois grain moth Sitotroga cerealella (Olivier). The duration and viability of the embryonic period, development of the immature stages and egg-adult period were evaluated. The mean embryonic period was 5.0 days, while the mean durations of the first, second and third instars were: 5.1 ± 0.03; 4.3 ± 0.05 and 4.5 ± 0.05 days, respectively, with viability exceeding 90%. Duration...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Insecta; Predator; Biology; Green lacewing.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000300025

Umidade relativa de equilibrio e oxidação de lipídeos em farinhas de castanha do Pará, de macadâmia e de soja
Provedor de dados: 63
Autores: Prado-Filho,L.G. do.
Foi estudada a oxidação de lipídeos adicionados a farinhas de castanha do Pará (Bertholleta excelsa), de macadâmia (Macadâmia integrifolia) e de soja (Glycine max) equilibradas nas atividades de água (Aa) 0,51; 0,57; 0,67; 0,75; 0,79 e 0,81, a 35°C. O substrato utilizado para quantificar tanto a oxidação autocatalítica como a oxidação enzímica foi o óleo de soja na proporção de 20% (p:p). Dois mecanismos de oxidação de lipídeos concorrem pelo substrato nas condições estudadas. A baixos valores de Aa - de 0,51 a 0,75 - o mecanismo mais eficiente é a autoxidação devida à maior exposição do substrato ao oxigênio e à menor mobilidade dos reagentes - enzima e lipídeo - nas reações de natureza enzímica. Em valores de Aa maiores - 0,79 e 0,81 - predomina a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Oxidação autocatalítica e enzímica; Lipídeos; Farinha; Castanha do Pará; Macadâmia; Soja.
Ano: 1994
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000200023

Swine manure digestate treatment using electrocoagulation
Provedor de dados: 63
Autores: Mores,Rúbia; Kunz,Airton; Steffens,Juliana; Dallago,Rogério Marcos; Benazzi,Toni Luis; Amaral,André Cestonaro do.
ABSTRACT Anaerobic biodigestion is an appropriate alternative for the treatment of swine wastewater due to its biogas generation properties and the possibility of its application as a source of energy for heating or electricity. However, digestate can still contain high levels of turbidity, organic carbon and nutrients and must be correctly managed as a biofertilizer, or treated to avoid any impact on the environment. Considering this, electrocoagulation (EC) shows promise as a technology because of its ease of handling and high efficiency in effluent remediation. This study aimed to evaluate the performance of EC in a batch system in the treatment of swine wastewater digestate. The wastewater used in the treatment was sampled from a 10 m3 biodigestor...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Electrode distance; Voltage; Factorial design; Batch system.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000500439

Geostatistical analysis of microrelief of an oxisol as a function of tillage and cumulative rainfall
Provedor de dados: 63
Autores: Vázquez,Eva Vidal; Vieira,Sidney Rosa; De Maria,Isabella Clerici; González,Antonio Paz.
Surface roughness can be influenced by type and intensity of soil tillage among other factors. In tilled soils microrelief may decay considerably as rain progresses. Geostatistics provides some tools that may be useful to study the dynamics of soil surface variability. The objective of this study was to show how it is possible to apply geostatistics to analyze soil microrelief variability. Data were taken at an Oxisol over six tillage treatments, namely, disk harrow, disk plow, chisel plow, disk harrow + disk level, disk plow + disk level and chisel plow + disk level. Measurements were made initially just after tillage and subsequently after cumulative natural rainfall events. Duplicated measurements were taken in each one of the treatments and dates of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil surface roughness; Detrending procedures; Roughness indices; Surface configuration.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000200012

Impact of crop management systems on soil nematode communities in South Brazil
Provedor de dados: 63
Autores: Machado,Andressa Cristina Zamboni; Zagatto,Maurício Rumenos Guidetti; Skora Neto,Francisco; Silva,Santino Aleandro da; Zanão Júnior,Luiz Antonio.
ABSTRACT The analysis of nematode communities allows inferring consequences of management practices on the soil food web. We studied the taxonomic structure of nematode communities in preserved areas of the Atlantic forest (native forest = NF) in Ponta Grossa, Paraná State, Brazil, and in three different agroecosystems in neighboring areas to assess the effect of agricultural land use on nematode assemblages. Agroecosystems were located in a red latosol cropped during 30 years under conventional tillage (CT), no-tillage (NT), and minimal tillage (MT). We collected ten composite soil samples in each area in the summer. Nematodes were extracted by Baermann funnel and fixed with formalin. Subsequently, individuals were classified into taxonomic groups and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Abundance; Diversity; Taxonomic structure; Soil indicators.
Ano: 2022
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162022000100701

Gypsum-saturated water to reclaim alluvial saline sodic and sodic soils
Provedor de dados: 63
Autores: Silveira,Karien Rodrigues da; Ribeiro,Mateus Rosas; Oliveira,Luiz Bezerra de; Heck,Richard John; Silveira,Rachel Rodrigues da.
Inadequate management of soil and irrigation water contribute to soil degradation, particularly in the alluvial areas of Northeast Brazil, where salinity and sodicity are already common features. This study evaluates the effects of the addition of gypsum in the irrigation water on physical and chemical properties of soils with different levels of salinity and sodicity. Samples were collected at the Custódia irrigation area of Brazil, predominantly covered by alluvial soils. Leaching tests using simulated irrigation water classified as C3S1, and gypsum-saturated irrigation water were carried out in soil columns of 20 and 50 cm depth. Soil leaching with gypsum saturated water (T2) resulted in an increase in the amounts of exchangeable calcium and potassium,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Salt affected soils; Irrigation; Reclamation; Management.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000100010

Data mining to estimate broiler mortality when exposed to heat wave
Provedor de dados: 63
Autores: Vale,Marcos Martinez; Moura,Daniella Jorge de; Nääs,Irenilza de Alencar; Oliveira,Stanley Robson de Medeiros; Rodrigues,Luiz Henrique Antunes.
Heat waves usually result in losses of animal production since they are exposed to thermal stress inducing an increase in mortality and consequent economical losses. Animal science and meteorological databases from the last years contain enough data in the poultry production business to allow the modeling of mortality losses due to heat wave incidence. This research analyzes a database of broiler production associated to climatic data, using data mining techniques such as attribute selection and data classification (decision tree) to model the impact of heat wave incidence on broiler mortality. The temperature and humidity index (THI) was used for screening environmental data. The data mining techniques allowed the development of three comprehensible...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: THI; Broiler production; Environmental data.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000300001

Interaction between resistance to Septoria tritici and phenological stages in wheat
Provedor de dados: 63
Autores: Gieco,Jorge Omar; Dubcovsky,Jorge; Camargo,Luis Eduardo Aranha.
Studies dedicated to understanding the behavior of pathogens in relation to their hosts are the starting point for any breeding program aimed to develop resistant cultivars. The objective of this study was to analyze the resistance to Septoria tritici Rob in 77 F11 progenies of wheat derived from the three-way cross Tadinia &lt;FONT FACE=Symbol&gt;´&lt;/FONT&gt; (Yecora rojo &lt;FONT FACE=Symbol&gt;´&lt;/FONT&gt; UC554) in the phenological stages of seedling, tillering, and flag leaf/flowering. Three field experiments were conducted where plants were artificially inoculated at one of the above mentioned phenological stages by spraying with a suspension of conidia. A randomized block design with four replications was used in each experiment. Disease...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mycosphaerella graminicola; Triticum aestivum; Leaf blotch; Disease resistance.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000400011

Specific residue: application of orthogonal contrasts when heteroscedasticity is present
Provedor de dados: 63
Autores: Nogueira,Maria Cristina Stolf.
When experimental data are submitted to analysis of variance, the assumption of data homoscedasticity (variance homogeneity among treatments), associated to the adopted mathematical model must be satisfied. This verification is necessary to ensure the correct test for the analysis. In some cases, when data homoscedascity is not observed, errors may invalidate the analysis. An alternative to overcome this difficulty is the application of the specific residue analysis, which consists of the decomposition of the residual sum of squares in its components, in order to adequately test the correspondent orthogonal contrasts of interest between treatment means. Although the decomposition of the residual sum of squares is a seldom used procedure, it is useful for a...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Analysis of variance; Completely randomized design; Randomized complete block design.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000100016

WHEAT CULTIVARS: RESPONSE TO IRRIGATION AND SOWING DATES
Provedor de dados: 63
Autores: Klar,A.E.; Hossokawa,T.
This study was carried out in an Alfisol-Oxisol transition sandy-clay texture, using six wheat cultivars (Triticum aestivum, L.): two tall and tolerant to soil aluminium toxicity (BH-1146, and IAC-18), and four semi-dwarf cultivars - Anahuac, IAC-162, IAC-24, and IAC-60 - of which only the first two are sensitive to soil aluminium toxicity. Two minimum soil water potentials (ys) levels were used: 1. watered, when Ys reached about -0.05 MPa; 2. dry, when the water potential reached around -1.5 MPa. Two sowing dates, 05/22/92 and 06/11/92, were used. The results showed that Anahuac and IAC-60 are the most indicated cultivars for the studied region; when irrigated all cultivars presented similar yield level under no irrigation conditions; the irrigation was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Irrigation; Growing season; Semi-dwarf and dwarf wheat plants.
Ano: 1996
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161996000200004

Accelerated aging and controlled deterioration for the determination of the physiological potential of onion seeds
Provedor de dados: 63
Autores: Rodo,Angelica Brod; Marcos Filho,Julio.
International research on vegetable seed vigor is not at the same level attained for grain crops species. This study was conducted to identify reliable procedures for the accelerated aging and controlled deterioration tests to rank onion (Allium cepa L.) seed lots according to their physiological potential. Six seed lots of the cultivars Aurora and Petroline were evaluated in the laboratory for germination, first count, seedling vigor classification, traditional and saturated salt accelerated aging (41ºC / 48 and 72 h), controlled deterioration (24% of water / 45ºC / 24 h) and seedling emergence tests. Seed moisture content after the saturated salt accelerated aging test was lower and uniform, which is considered an important advantage in comparison to the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Allium cepa; Seed analysis; Vigor.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000300008

EFICIÊNCIA AGRONÔMICA DE FOSFATOS NATURAIS REATIVOS NA CULTURA DO MILHO
Provedor de dados: 63
Autores: Korndörfer,Gaspar Henrique; Lara-Cabezas,Waldo Alejandro; Horowitz,Nelson.
O presente trabalho teve como objetivo avaliar o comportamento agronômico de fosfatos naturais estrangeiros quanto a produção de grãos de milho comparando com o superfosfato triplo. O ensaio foi conduzido em um latossolo vermelho amarelo de textura média no município de Uberlândia-MG. Os tratamentos empregados foram: fosfato Arad e Gafsa nas doses de P205 de 100 e 200 kg ha-1 e fosfato Marrocos e superfosfato triplo nas dosagens de 0, 50, 100, 200 e 400 kg ha-1. A capacidade dos fosfatos naturais Arad, Marrocos e Gafsa em fornecer fósforo para o milho foi de 60, 80 e 97%, respectivamente, quando comparados com o superfosfato triplo. Houve correlação positiva entre os teores de P nas folhas do milho e a produtividade. A avaliação do P disponível no solo foi...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Arad; Gafsa; Marrocos; Fósforo; Resina.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000200019

Aplicação de co2 via água de irrigação em relação à produtividade do meloeiro
Provedor de dados: 63
Autores: Pinto,José Maria; Botrel,Tarlei Arriel; Machado,Eduardo C.; Feitosa Filho,José C.
A cultura do melão tem se firmado no Brasil como importante fonte de divisas para o agricultor, ocupando expressiva parcela na nossa pauta de exportações. A concentração do dióxido de carbono (CO2) na atmosfera era de 250 mimolCO2 mol-1 antes da revolução industrial, atingiu a 315 mimolCO2 mol-1 em 1958, estando, hoje, próximo de 365 mimolCO2 mol-1, com tendência de aumentar ainda mais. O aumento da concentração de CO2 aumenta a fotossíntese e a absorção de nutrientes pelas plantas. Nesse trabalho avaliaram-se a produtividade e as características dos frutos de melão em função da aplicação de CO2 via água de irrigação por gotejamento. A aplicação de CO2 foi realizada diariamente, três vezes por semana e sem aplicação de CO2 (testemunha) em três maneiras de...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cucumis melo; Fotossíntese; Qualidade de fruto.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000100006

Selection of Trichogramma species as potential natural enemies for the control of Opogona sacchari (Bojer)
Provedor de dados: 63
Autores: Carli,Mayara de; Coelho Júnior,Aloisio; Milanez,José Maria; Nardi,Cristiane; Parra,José Roberto Postali.
ABSTRACT: The banana moth Opogona sacchari (Bojer) (Lepidoptera: Tineidae) is a polyphagous pest that can cause serious damage, especially to banana crops in southern Brazil. It attacks the fruit, lowering its quality and making bananas unsuitable for export. Current control measures are limited and the use of Trichogramma (Hymenoptera: Trichogrammatidae) for Applied Biological Control may be an alternative for the management of this pest. In this study, we investigated the potential parasitism effectiveness of eggs of O. sacchari by T. pretiosum, T. atopovirilia and T. galloi, three species of parasitoids commonly used in Applied Biological Control programs in Brazil. Eggs of O. sacchari were parasitized by all three Trichogramma species, and T....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: IPM; Banana moth; Biological control.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162017000500401

Processos de proteção dos garfos na enxertia da mangueira
Provedor de dados: 63
Autores: Jacomino,Angelo Pedro; Minami,Keigo; Scarpare Filho,João Alexio; Kluge,Ricardo Alfredo.
Diferentes processos de proteção dos garfos foram pesquisados na produção de mudas por enxertia, da mangueira ‘Tommy Atkins’. Os tratamentos utilizados foram os seguintes: saquinho de polietileno (testemunha), filme de PVC, parafilme, cera de abelha, parafina e parafina + vaselina. Verificou-se que o filme de PVC e o parafilme proporcionaram pegamentos de enxertia semelhantes à testemunha (40,60%, 56,62% e 48,33%, respectivamente), enquanto que para os demais tratamentos, os percentuais de pegamento foram muito baixos (&amp;lt; 10%). Conclui-se que o filme de PVC e o parafilme podem ser empregados como opção aos saquinhos plásticos, na proteção dos garfos da mangueira, no procedimento da enxertia.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mangifera indica; Propagação; Enxertia; Proteção do garfo.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000100017

ENRAIZAMENTO DE ESTACAS DE LIMEIRA ÁCIDA 'TAHITI' COLETADAS EM DIFERENTES POSIÇÕES NA ÁRVORE
Provedor de dados: 63
Autores: Araújo,Paulo Sérgio Rodrigues de; Mourão Filho,Francisco de Assis Alves; Silva,João Augusto Fernandes da; Barbano,Marcelo Trevisan.
Avaliou-se o enraizamento de três tipos de estacas (semilenhosa, madeira semidura; semilenhosa, madeira dura e lenhosa) de limeira ácida 'Tahiti', coletadas em três diferentes posições da copa (basal, medial e apical). Adotou-se o delineamento experimental no esquema fatorial 3x3 em blocos casualizados, com cinco repetições e 20 estacas/parcela. Os dados biométricos avaliados foram: percentual de enraizamento e formação de calo, número e comprimento médio de raízes, número de folhas/estaca enraizada e porcentagem de mortalidade. As médias foram comparadas pelo teste de Tukey ao nível de 5% de probabilidade. Observou-se que as estacas semilenhosas (madeira semidura) apresentaram os melhores índices em relação a todas as variáveis analisadas,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Citrus latifolia; Propagação.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000200014

Aplicability of phenotypic and canonic correlations and path coefficients in the selection of oat genotypes
Provedor de dados: 63
Autores: Lorencetti,Claudir; Carvalho,Fernando Irajá Félix de; Oliveira,Antônio Costa de; Valério,Igor Pirez; Hartwig,Irineu; Benin,Giovani; Schmidt,Douglas André Mallmann.
Indirect selection through traits of higher heritability and of case measurements can result in larger genetic progress compared to using direct selection. This work was performed with the following objectives: (1) to estimative the phenotypic correlations between individual plant grain yield and agronomic traits of importance in the selection of white oat (Avena sativa L.) genotypes; (2) to identify traits that have the higher direct and indirect effects on grain yield; (3) to determine the intensity of association between primary and secondary components of grain yield; and, (4) to evaluate the consistency of these estimates using five oat genotypes crossed in a diallel format. The number of panicles per plant (NPP) showed to be the trait highest...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Avena sativa L.; Heritability; Indirect selection.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000100003

Comparação de métodos de laboratório e de campo para a estimativa da área foliar em fruteiras silvestres
Provedor de dados: 63
Autores: Mielke,M.S.; Hoffmann,A.; Endres,L.; Fachinello,J.C.
Foi realizado um trabalho com o objetivo de estudar diferentes métodos de laboratório e de campo para a estimativa da área foliar de fruteiras silvestres, pertencentes à família Myrtaceae, a saber: uvalheira (Eugenia uvalha Camb.), aracazeiro (Psidium cattleyanum Sabine), goiabeira serrana (Feijoa sellowiana Berg.) e pitangueira (Eugenia uniflora DC). Entre os métodos de laboratório, também utilizados como "padrão", bons resultados foram obtidos utilizando-se um medidor automático de área foliar, planímetro ou através do método gravimétrico (fotocópia ou papel filtro). Dentre os métodos de campo, os melhores resultados foram obtidos por regressão linear. As estimativas das áreas foliares (y) para as quatro espécies estudadas podem ser tomadas a partir das...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Análise de crescimento; Eugenia uvalha; Psidium cattleyanum; Feijoa sellowiana; Eugenia uniflora.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000100015

Influência de diferentes níveis de cálcio em plantas de estilosantes (Stylosanthes guyanensis (Aubl.) Sw. cv. Cook), avaliados através de alguns parâmetros fisiológicos
Provedor de dados: 63
Autores: Rodrigues,J.D.; Rodrigues,S.D.; Delachiave,M.E.A.; Pedras,J.F.; Boaro,C.S.F.; Ono,E.O.
O objetivo do presente trabalho foi estudar os efeitos de diferentes níveis de cálcio, no desenvolvimento de plantas de Stylosanthes guyanensis (Aubl.) Sw. cv. Cook, através de alguns parâmetros que compõem a análise fisiológica de crescimento. Para tal foram empregados 4 tratamentos a saber: T1 (200 mg de cálcio/litro); T2 (133,33 mg de cálcio/litro); T3 (66,66 mg de cálcio/litro) e T4 (omisso em cálcio). O trabalho foi montado em cultivo hidropônico, utilizando-se a solução nutritiva n° 1 de Hoagland &amp;amp; Arnon e conduzido em casa de vegetação. Foram realizadas observações em intervalos entre 5 coletas, distribuidas da seguinte maneira: intervalo I (entre 24° e 38° dia pós-germinação; intervalo II ( do 38° ao 52° dia); intervalo III (do 52° ao 66°...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Estilosantes; Análise de crescimento; Cálcio; Nutrição mineral.
Ano: 1993
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161993000100008

Matéria seca, digestibilidade in vitro e composição químico-bromatológica do capim (Paspalum notatum ) cv. 'tifton 9' com diferentes idades
Provedor de dados: 63
Autores: Vendramini,João Maurício Bueno; Haddad,Cláudio Maluf; Castro,Flávio Geraldo Ferreira; Vieira,Andrea Campmany; Heisecke,Osvaldo Ruben Peralta; Tamassia,Luis Fernando Monteiro.
Esse trabalho teve como objetivo avaliar a produção de matéria seca, digestibilidade in vitro, teores de proteína bruta e de fibras, bem como a composição mineral do capim espécie `Tifton 9', em diferentes idades de crescimento. As avaliações foram realizadas aos 20, 27, 34, 41, 48 e 55 dias após o corte de uniformização. O delineamento estatístico adotado foi o de blocos completos casualizados com seis tratamentos e quatro repetições. A produção de matéria seca variou de 188 a 593 g m-2, sendo o modelo cúbico de regressão o que melhor se ajustou (P&amp;lt;0,05). Os teores de fibra em detergente ácido, lignina e proteína bruta, tiveram seus valores entre 387,73 a 370,04 g kg-1, 37,56 a 26,67 e 121,33 g kg-1 a 68,88 g kg-1 respectivamente, apresentando...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Tifton 9; Paspalum; Forrageira; Bromatológica.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000300018

Growth of bare root Pinus taeda, L. seedlings cultivated under five densities in nursery
Provedor de dados: 63
Autores: Carneiro,José Geraldo de Araújo; Barroso,Deborah Guerra; Soares,Luis Maurício da Silva.
Seedlings compete for nutrients, water and light. The available area for each seedling affects their behavior related to requirements for these resources. This experiment evaluated the influence of five plant densities on the growth of bare root Pinus taeda, L. seedlings in a nursery after outplanting. The analyzed characteristics were: height (H), root collar diameter (D), H/D ratio, and dry matter weight. Higher densities stimulated H growth and the lowest densities increased D average and dry matter weight and lowered the H/D ratio. Seedlings were distributed by H, D and H/D classes. Higher densities had a larger number of seedlings in larger H classes. Larger numbers of seedlings with larger D and lower H/D ratios were found in lower densities. Ten...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Spacing; Erosion; Seedling quality; Morphological characteristics; Root growth.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000100004

EFEITO DA TREALOSE NA MANUTENÇÃO DA VIABILIDADE DE CÉLULAS DE LEVEDURAS DESIDRATADAS POR LIOFILIZAÇÃO
Provedor de dados: 63
Autores: ALCARDE,A.R.; BASSO,L.C.
O presente trabalho teve por objetivo avaliar a influência da trealose endógena e também o uso da trealose como crioprotetor, na preservação da viabilidade celular de leveduras de interesse industrial quando submetidas ao processo de liofilização. Foram utilizadas as cepas TA (M-300-A) e SA (cepa isolada da Usina Santa Adélia S/A) da levedura Saccharomyces cerevisiae e a cepa IZ-1904 da levedura Saccharomyces boulardii, as quais passaram por um tratamento de acúmulo da trealose endógena, através de tratamento térmico a 45oC por duas horas em meio tampão citrato de potássio 2M, pH 4,0, acrescido de 2% de glicose, e, a seguir, foram suspensas em cada uma de três soluções crioprotetoras, que foram: leite desnatado a 10%, sacarose a 10% e trealose a 10%. Em...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Trealose; Viabilidade; Liofilização.
Ano: 1997
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161997000200013

Yield and quality criteria in organically and conventionally grown tomatoes in Turkey
Provedor de dados: 63
Autores: Polat,Ersin; Demir,Halil; Erler,Fedai.
The term 'organically grown food' denotes products that have been produced in accordance with the principles and practices of organic agriculture. The use of alternatives to synthetic fertilizers is an important issue in organic systems. A two-year field experiment to evaluate effects of organic fertilizers on the yield and quality of open field grown tomatoes (Lycopersicon esculentum Mill.) was carried out in Southern Turkey in 2000 and 2001. Combinations of manure, blood flour and micronutrient preparations were used for fertilization, and conventional mineral fertilization was included as the control. Yield did not differ between the fertilization and the Conventional treatments in the first year of the study, but the highest yield was obtained from...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lycopersicon esculentum; Organic growing; Conventional growing.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000400008

Visitantes florais de plantas invasoras de áreas com fruteiras irrigadas
Provedor de dados: 63
Autores: Kiill,Lúcia Helena Piedade; Haji,Francisca Nemaura Pedrosa; Lima,Paulo César Fernandes.
As plantas invasoras afetam a produtividade das fruteiras irrigadas, sendo necessários estudos sobre sua ecologia, principalmente formas de reprodução e associação com insetos. O presente trabalho foi desenvolvido em Petrolina-PE, objetivando classificar os visitantes florais de plantas invasoras em polinizadores e pilhadores, de acordo com o comportamento apresentado. As observações foram feitas de maio a outubro de 1998, em 26 dias não consecutivos, no intervalo das 7h00 às 16h00. As invasoras foram classificadas em nectaríferas e poliníferas, quando visitadas para retirada exclusiva de néctar ou de pólen; e em mistas, quando visitadas para retirada dos dois recursos. Para a análise de freqüência foi adotado um sistema de notas: a- número de visitas...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Polinizador; Néctar; Pólen; Invasoras.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000300034

Saturação por bases e híbridos de milho sob sistema plantio direto
Provedor de dados: 63
Autores: Prado,Renato de Mello.
O conhecimento dos híbridos adaptados a cada condição de reação do solo em sistema plantio direto é de significativa importância técnica. Para avaliar o comportamento de híbridos de milho sob sistema plantio direto, quanto a alguns componentes de rendimento, submetidos a níveis de saturação por bases, foram conduzidos dois experimentos no V% 45 e V% 65 em área com 4 anos em sistema plantio direto, na região dos cerrados, em Uberaba, MG. Os experimentos foram desenvolvidos no delineamento em blocos ao acaso, com quatro repetições. Os sete tratamentos foram constituídos pelos seguintes híbridos de milho: Z 8474, BR 3123, AG 122, C 333, D 657, Exceller e P 3071. Na média dos híbridos de milho estudados a saturação por bases de 65% foi a que mais contribuiu...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays; Adaptação; Acidez do solo; Componentes do rendimento; Rendimentos de grãos.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000200024

Controle químico de ovos e ninfas de Bemisia tabaci biótipo B (Hemiptera: aleyrodidae)
Provedor de dados: 63
Autores: Valle,Giuliana Etore do; Lourenção,André Luiz; Novo,José Polese Soares.
Moscas brancas são pragas de diversas culturas, causam redução na produção e na qualidade do produto. Inseticidas, com diferentes modos de ação vêm sendo utilizados, sem muito sucesso. Neste trabalho avaliou-se a eficiência de inseticidas sobre ovos de diferentes idades (1, 3 e 5 dias) e de ninfas de 1° ínstar da mosca branca Bemisia tabaci biótipo B. Os experimentos foram realizados em condições de laboratório, sob temperatura de 25 ± 2°C e fotofase de 12 horas. Piriproxifem (75 mg L-1) atuou como excelente ovicida, sendo altamente eficiente, 3 dias de idade. Cartape (500 mg L-1) não teve efeito satisfatório, mas a 1000 mg L-1 foi eficiente em ovos com até 5 dias de idade. Quanto à ação sobre ninfas de 1° ínstar, para pulverizações na face superior das...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bemisia argentifolii; Insecta; Mosca branca; Inseticidas.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000200013

Performance of new Hevea clones from IAC 400 series
Provedor de dados: 63
Autores: Gonçalves,Paulo de Souza; Silva,Marcelo de Almeida; Aguiar,Adriano Tosoni da Eira; Martins,Maria Alice; Scaloppi Junior,Erivaldo José; Gouvêa,Lígia Regina Lima.
The Hevea breeding program of Instituto Agronômico de Campinas (IAC) has completed clonal evaluation on the following series: IAC 100, IAC 200 and IAC 300. The performance of 22 clones of Hevea brasiliensis (Willd. ex Adr. de Juss.) Muell.-Arg., evolved at IAC, over a period of eleven years was evaluated in the Western Central part of the São Paulo State, Brazil. Among these 22 new clones, six were intraspecific hybrid clones (IAC 400, IAC 404, IAC 405, IAC 406, IAC 410, IAC 412) and the remaining are primary those resulted from selected ortets within half-sib progenies. An old popular clone RRIM 600, of Malaysian origin, was used as the control. The trial was laid out in a randomized block design with three replications. Yield performance over a period of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hevea brasiliensis; Yield; Vigour; Brown bast; Bark thickness.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000300005

MANGUEIRA: INFLUÊNCIA DO PORTA-ENXERTO E DA COPA NA PRODUÇÃO DE FRUTAS
Provedor de dados: 63
Autores: Simão,S.; Barbin,D.; Nylander,O.; Ohashi,B.
O objetivo deste trabalho foi o de estudar o comportamento de diferentes variedades pelos diversos porta-enxertos. Os dados foram tomados das produções de 1981, 1982 e 1983 quando 210 plantas tinham de 15 a 17 anos de idade. As variedades copas estudadas foram as seguintes: Extrema, Oliveira Neto, Carlota, Imperial, Pahiri e Bourbon. Os porta-enxertos usados foram Espada, Extrema, Oliveira Neto, Carlota, Coco, Pahiri e Bourbon.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Manga; Porta-enxerto.
Ano: 1997
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161997000200012

Analyzing one-way experiments: a piece of cake of a pain in the neck?
Provedor de dados: 63
Autores: Kozak,Marcin.
Statistics may be intricate. In practical data analysis many researchers stick to the most common methods, not even trying to find out whether these methods are appropriate for their data and whether other methods might be more useful. In this paper I attempt to show that when analyzing even simple one-way factorial experiments, a lot of issues need to be considered. A classical method to analyze such data is the analysis of variance, quite likely the most often used statistical method in agricultural, biological, ecological and environmental studies. I suspect this is why this method is quite often applied inappropriately: since the method is that common, it does not require too much consideration-this is how some may think. An incorrect analysis may...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Analysis of variance; Assumptions; Graphical statistics; Multiple comparisons; Normal distribution; Non-parametric statistics; One-way designs; Statistical analysis.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000400020

Avaliação de frutos de laranjeira 'Pera' em função dos anelamentos de ramos em diferentes épocas
Provedor de dados: 63
Autores: Simões Júnior,Abel Rodrigues; Mourão Filho,Francisco de Assis Alves; Araújo,Paulo Sérgio Rodrigues de; Piedade,Sônia Maria de Stefano; Jacomino,Ângelo Pedro.
Avaliou-se os efeitos da técnica de anelamento em ramos na qualidade dos frutos de laranja `Pera' na época de verão e outono. O trabalho foi desenvolvido em Piracicaba, SP, utilizando-se laranjeiras `Pera' enxertadas em limoeiro `Cravo', cultivadas no espaçamento 8,0 x 4,0 m. Adotou-se quatro tratamentos (anelamento simples, duplo, paralelo e testemunha) em duas épocas (verão e outono). O delineamento experimental foi inteiramente casualizado, sendo utilizados os seguintes parâmetros para avaliação: altura, diâmetro, massa, volume, espessura da casca, percentagem de suco, acidez, sólidos solúveis totais e "ratio". Observou-se que houve efeito do anelamento, destacando-se o anelamento simples, sobre a qualidade dos frutos na época de verão.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Citrus sinensis; Qualidade de frutos; Laranja.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000300004

Potential of the seedling community of a forest fragment for tropical forest restoration
Provedor de dados: 63
Autores: Viani,Ricardo Augusto Gorne; Rodrigues,Ricardo Ribeiro.
Forest restoration projects are usually planted with a reduced number of species as compared to standing forests, largely due to the low availability of native species in seedling nurseries. In the present study, the potential of the native seedling community as a source of seedlings for forest restoration is analyzed. To do so, the seedling community from a forest fragment located in the southeast of Brazil was evaluated. Individuals (tree and shrub species) up to 30 cm height were measured and identified in 20 4 × 4 m plots. Altogether, 6,136 individuals (17 individuals m-2) belonging to 119 species were sampled. The seedling community showed a spatial heterogeneity with respect to the density of individuals and composition of species, and also a spatial...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ecological restoration; Natural regeneration; Transplants; Seedling production; Forest nurseries.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000600008

Annual characteristics of estrous activity in wool and hair ewe lambs under subtropical conditions
Provedor de dados: 63
Autores: Rodrigues,Paula de Almeida; Coelho,Lia de Alencar; Nonaka,Keico Okino; Sasa,Aya; Vicente,Wilter Ricardo Russiano; Balieiro,Júlio César de Carvalho; Siqueira,Edson Ramos de.
The increased emphasis placed on lamb production in Brazil points to the need for a better knowledge of the annual pattern of reproductive activity in ewe lambs. This study evaluates the annual estrous activity pattern of hair and wool ewe lambs raised in southeast Brazil. Estrous characteristics were recorded for 12 months in ten Santa Inês and 21 Romney Marsh and Suffolk ewe lambs. Santa Inês ewe lambs exhibited a greater length of the normal estrous cycle (14 to 19 days) than Romney Marsh and Suffolk ewe lambs (17.0 ± 0.1 days vs. 16.5 ± 0.2 and 15.9 ± 0.2 days). All the ewe lambs presented a greater number of periods of estrus per animal per month for single estrous cycles (up to 26 days) during autumn and winter. During spring and summer there was a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Breeds; Estrous cycle; Sheep; Subtropics; Seasonality.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000500003

DESEMPENHO VEGETATIVO E PRODUTIVO DE CULTIVARES DE MANDIOCA (Manihot esculenta Crantz) A PARTIR DE MANIVAS COM DIFERENTES DIÂMETROS
Provedor de dados: 63
Autores: CÂMARA,G.M.S.; GODOY,O.P.
Realizou-se esta pesquisa com a finalidade de se estudar a viabilidade da utilização de manivas com três diferentes diâmetros relacionados a três diferentes posições nas plantas de origem, avaliando-se seus efeitos na emergência, desenvolvimento e produção de três cultivares de mandioca (Manihot esculenta Crantz). A pesquisa no campo foi realizada em dois anos, durante o período compreendido entre 23/09/1980 e 23/07/1981 e entre 01/09/1981 e 20/07/1982, em Piracicaba, SP. Ramas maduras e sadias foram obtidas de plantas com cerca de 12 meses de idade, pertencentes aos cultivares Mantiqueira, Jaçanã e Pirassununga. Destas ramas, foram preparadas manivas com comprimento de 20 cm e diâmetros de 2,6 ± 0,2 cm, 2,0 ± 0,2 cm e 1,4 ± 0,2 cm, representando,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Propagação vegetativa de mandioca; Qualidade de maniva.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000200024

Trap attributes influencing capture of Diabrotica speciosa (Coleoptera: Chrysomelidae) on common bean fields
Provedor de dados: 63
Autores: Ventura,Maurício Ursi; Resta,Claudio Cezar Mariano; Nunes,Daiane Heloísa; Fujimoto,Fabio.
Refinements in trap characteristics may improve ability to monitor and mass-trap beetles. Field assays were conducted in common bean fields to assess responses of Diabrotica speciosa (Germar) to some trap characteristics. Golden yellow plastic cups (750 mL) traps caught more D. speciosa females and males than did clear traps. Carrot slices in Petri dishes baited with Lagenaria vulagaris L. powder (cucurbitacin source - 0.28%) caught more beetles than did dishes with carrot alone. Dispensers for the floral volatile attractant 1,4-dimethoxybenze were also compared. Rubber septa dispenser attracted more beetles than did control (dental wicks saturated with acetone). Captures on dental wick, starch matrix and feminine pad dispensers were intermediate and did...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Attractant; Feeding stimulant; Semiochemical; Integrated pest management.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000400008

Cério (Ce) em ferricretes nodulares desenvolvidos em solos da formação adamantina
Provedor de dados: 63
Autores: Coelho,Maurício Rizzato; Vidal-Torrado,Pablo.
O estudo de concentrações anômalas de elementos traço em ferricretes, como cério (Ce) e outros elementos das terras raras, tem apoiado discussões a respeito da gênese dessas feições em diferentes ambientes do planeta. No município de Pindorama (SP), no sopé de uma vertente com domínio de Argissolos Vermelho-Amarelos abrúpticos derivados do arenito cretácico da Formação Adamantina, Grupo Bauru (Ka), ocorrem horizontes ferricretes, cujas características e gênese são escassamente conhecidas, embora sejam de ocorrência comum na região norte do Estado de São Paulo. Procurou-se verificar a presença de concentrações de elementos terras raras nesses solos e assim poder fornecer subsídios para o conhecimento da gênese desses ferricretes, estudando-se um Argissolo...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Laterita; Petroplintita; Plintita.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000200021

Learning soil classification with the Kayapó indians
Provedor de dados: 63
Autores: Cooper,Miguel; Teramoto,Edson Roberto; Vidal-Torrado,Pablo; Sparovek,Gerd.
The Kayapó Xicrin do Cateté (Xicrin) indigenous reserve is located within the Amazon forest in Pará (Brazil). The Xicrins have developed a soil classification system that is incorporated in their language and culture. The etymology of their classification system and its logical structure makes it similar and comparable with modern soil classification. The etymology of the Xicrin's language is based on the junction of radicals to form words for different soil names. The name of the soil is formed by the main noun radical "puka", to which adjectives referring to soil morphological attributes are added. Modern classification systems are also based on similar morphological variables, and analytical support for defining boundaries of chemical or physical soil...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Xicrin do Cateté; Amazon; Brazil; Indigenous knowledge.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000600016

Leaf life span and nitrogen content in semideciduous forest tree species (Croton priscus and Hymenaea courbaril)
Provedor de dados: 63
Autores: Haddad,Claudia Regina Baptista; Lemos,Damiani Pereira; Mazzafera,Paulo.
In comparison to deciduous species, evergreen plants have lower leaf nutrient contents and higher leaf life span, important mechanisms for nutrient economy, allowing the colonization of low fertility soils. Strategies to conserve nitrogen in two semideciduous tropical forest tree species, with different leaf life spans were analyzed. The hypothesis was the fact that the two species would present different nitrogen conservation mechanisms in relation to chemical (total nitrogen, protein, chlorophyll, and proteolytic activity), functional (leaf life span, N-use efficiency, and N-resorption efficiency), morphological (specific leaf mass) leaf characteristics, and total nitrogen in the soil. Hymenaea courbaril L. presented lower nitrogen compounds in leaves,...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Leaf life span; Specific leaf mass; N-resorption efficiency; N-use efficiency; Atlantic forest.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000400018

Crop rotation and tillage system on the Italian ryegrass seed bank after long-term field management
Provedor de dados: 63
Autores: Guareschi,André; Cechin,Joanei; Bianchi,Mario Antonio; Maldaner,Ivan Carlos; Machado,Sergio Luiz de Oliveira.
ABSTRACT: Italian ryegrass (Lolium multiflorum Lam.) is a troublesome weed widely found in temperate Brazilian fields with several herbicide-resistant populations. Soil seed bank is the main source of future infestations and can be strongly affected by agricultural practices, such as crop rotation and tillage system. Therefore, this study evaluated the long-term effects of different crop rotation and tillage systems on the seed bank of Italian ryegrass. Data were collected in 2012 and 2013 in a field managed since 1985 under conventional-tillage and no-tillage and subjected to three cropping systems (monoculture, total, and partial rotation) compared to the control plot. The samples were collected at three soil depths (0-5, 5-10, and 10-20 cm) using a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lolium multiflorum Lam.; Dynamic population; Cultural methods; Mechanical practices; Weed control.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000500601

Inheritance of reaction to Leveillula taurica (Lev.) Arn. in Capsicum annuum L.
Provedor de dados: 63
Autores: Blat,Sally Ferreira; Costa,Cyro Paulino da; Vencovsky,Roland; Sala,Fernando Cesar.
The use of fungicides to control powdery mildew in sweet pepper has been ineffective and genetic resistance is the best alternative. Resistance sources identified in Capsicum annuum L. are rare and unsatisfactory. The purpose of this work was to study the inheritance of C. annuum reaction to powdery mildew. Three homozygous powdery mildew resistant parents, HV-12, Chilli and #124 and three susceptible lines, 609, 442 and 428 were used to obtain seven F1's and respectively their generations F2: HV-12 x 609, 442 × HV-12, 428 × HV-12, Chilli × 609, #124 × 609, Chilli × HV-12 and #124 × HV-12. The powdery epidemic was natural using inoculum from highly sporulating susceptible pepper host. Powdery mildew host reaction evaluations were carried out during the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sweet pepper; Powdery mildew; Genetic resistance; Gene action; Allelism.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000100008

Leaf area prediction models for Zinnia elegans Jacq., Zinnia haageana regel and 'profusion cherry'
Provedor de dados: 63
Autores: Pinto,Ana Christina Rossini; Rodrigues,Teresinha de Jesus Deléo; Barbosa,José Carlos; Leite,Izabel Cristina.
Leaf area measurements are of value in physiological and agronomic studies. The use of prediction models to estimate leaf area is a simple, accurate and nondestructive method. The present work suggests leaf area prediction models for Zinnia elegans ('Liliput' and 'Thumbelina'), Z. haageana ('Carpet Persa') and Z. elegans x Z. angustifolia ('Profusion Cherry'), potential flower potplant cultivars. At the stages of visible apical flower bud and flowering, 250 and 300 leaves were collected from greenhouse grown plants, respectively, at each season (fall, winter, spring and summer), totaling 1,000 and 1,200 leaves, for each developmental stage. The maximum length (L), maximum width (W) and real leaf area (RLA) were measured with a Digital Image Analysis System...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Floriculture; Potted plants; Linear regression.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000100009

Production and nutritive value of pastures in integrated livestock production systems: shading and management effects
Provedor de dados: 63
Autores: Pezzopane,José Ricardo Macedo; Bernardi,Alberto Carlos de Campos; Azenha,Mariana Vieira; Oliveira,Patricia Perondi Anchão; Bosi,Cristiam; Pedroso,André de Faria; Esteves,Sérgio Novita.
ABSTRACT This study aimed to evaluate the production characteristics of pastures in integrated livestock production systems. For that, an experiment was carried out in São Carlos, SP, Brazil, from 2013 to 2015. Forage development, production and nutritive value were evaluated in five beef cattle production systems: extensive continuous stocking (Urochloa decumbens) = EXT; intensive = INT; crop-livestock = iCL; livestock-forest = iLF and crop-livestock-forest = iCLF. Rotational stocking pastures in INT, iCL, iLF and iCLF systems were established with Urochloa brizantha cv. BRS Piatã. In iCL and iCLF, pastures were renovated by resowing the grass simultaneously with corn. In iLF and iCLF, eucalyptus (Eucalyptus urograndis clone GG100) was planted in Apr 2011...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Urochloa brizantha; Eucalyptus urograndis; Solar radiation; Competition; Sustainability.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000200402

Priming of pioneer tree Guazuma ulmifolia (Malvaceae) seeds evaluated by an automated computer image analysis
Provedor de dados: 63
Autores: Brancalion,Pedro Henrique Santin; Tay,David; Novembre,Ana Dionisia da Luz Coelho; Rodrigues,Ricardo Ribeiro; Marcos Filho,Júlio.
Direct seeding is one of the most promising methods in restoration ecology, but low field seedling emergence from pioneer tree seeds still reduces its large scale applicability. The aim of this research was to evaluate seed priming for the pioneer tree species Guazuma ulmifolia. Priming treatments were selected based on seed hydration curves in water and in PEG 8000 solution. Seeds were primed in water for 16 h and in Polyethylene glycol - PEG 8000 (-0.8 MPa for 56 and 88 h) at 20ºC to reach approximately 30% water content. Half of the seed sample of each treatment was dried back to the initial moisture content (7.2%); both dried and non-dried primed seeds as well as the unprimed seeds (control) were tested for germination (percentage and rate) and vigor...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: SVIS®; Forest seeds; Seed vigor; Restoration ecology; Direct seeding.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000300004

Atrazine movement in a dark red latosol of the tropics
Provedor de dados: 63
Autores: Souza,M.D. de; Basssoi,L.H.; Bacchi,O.O.S.; Reichardt,K.; Hermes,L.C.; Abakerli,R.B.; Pilotto,J.E.
Atrazine displacement was studied in a soil profile as a function of water movement and time after herbicide application, taking into account possible influence of preferential flow on leaching. The experiment consisted of two 7 x 7m plots of a dark red latosol (Kanduidalfic Eutrudox), located at Piracicaba, SP, Brazil (22º 43'S and 47º 25'W), 250km inside continent, at an altitude of 580m. One plot was previously treated with 1,000 kg/ha of lime, in order to increase base saturation to 88%, and 500kg/ha of gypsum. Each plot was instrumented with tensiometers, neutron probe access tubes and soil solution extractors, in order to monitor water and atrazine flows. Atrazine was applied at the high rate of 6 kg/ha of active principle. Results showed intensive...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Atrazine; Leaching; Preferential flow; Adsorption; Herbicide; Tropical soil.
Ano: 1997
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161997000300013

Bulk density and relationship air/water of horticultural substrate
Provedor de dados: 63
Autores: Fernandes,Carolina; Corá,José Eduardo.
Change on substrate bulk density during the growing period may negatively affect other substrate physical properties and, consequently, plant growth. The objectives of this research were 1) to characterize physical properties of two horticultural substrates (S1 and S2), 2) to evaluate the effect of different bulk densities values of those substrates on their air/water relationship, and 3) to develop mathematical functions to estimate the air/water relationship by increasing substrates bulk density value. First, the distribution of particles size, the bulk density, and the water release curve of the substrates were determined. Then, substrates were packed with three different bulk density values, i.e. 10% (D1), 20% (D2) and 30% (D3), higher than the bulk...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Particle size distribution; Substrate bulk density; Water release curve; Regression equation.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000400015

Optimum plant population for maize-bean intercropping system in the Brazilian semi-arid region
Provedor de dados: 63
Autores: Morgado,Luiz Balbino; Willey,Robert William.
Establishment of the ideal number of plant is a crucial point for obtaining maximum profits while cropping different species together. The main objective of the study was to investigate the effect of different plant populations of maize and beans, at two nitrogen levels, on the performance of the component crops. Two maize (20,000 and 40,000 plants ha¹) and three bean (30,000; 60,000 and 90,000 plants ha¹) populations were tested in a randomized complete block design with tree replicates. Grain yields of maize and beans were affected by intercropping and the effect was more detrimental to the legume mainly at the highest maize plant population. The application of nitrogen fertilizer to maize rows mitigated intercropping effect on maize at higher population...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays; Phaseolus vulgaris; Cropping system; Plant density.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000500005

Assessing the implications of mycotoxins on productive efficiency of broilers and growing pigs
Provedor de dados: 63
Autores: Kipper,Marcos; Andretta,Ines; Ribeiro,Andréa Machado Leal; Pires,Paula Gabriela da Silva; Franceschina,Carolina Schell; Cardinal,Kátia Maria; Moraes,Priscila de Oliveira; Schroeder,Bruna.
ABSTRACT: The effects of mycotoxins on the productive performance of growing pigs and broilers were evaluated using meta-analytical approach. Two databases were constructed: (1) Broilers, with information collected from 51,497 birds and published in 158 scientific papers from 1980 to 2016; and (2) Pigs, with information collected from 7,743 animals and published in 72 scientific papers from 1980 to 2015. The meta-analyses were performed independently for each specie, following three sequential analyses: graphical, correlation, and variance-covariance. Broilers and pigs challenged by mycotoxins reduced (p &lt; 0.05) feed intake by 9 and 6 %, weight gain by 15 and 11 %, and feed efficiency by 6 and 4 % compared with non-challenged animals, respectively....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aflatoxins; Deoxynivalenol; Nutrition; Poultry; Piglet.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000300400

Avaliação do enraizamento de estacas de crisântemo (Chrysanthemum morifolium L.) cv. white Reagan 606 tratadas com ácido indolbutírico (IBA)
Provedor de dados: 63
Autores: Cuquel,F.L.; Granja,N. do P.; Minami,K.
Avaliou-se o efeito de doses crescentes do ácido indolbutírico (IBA) e de diferentes tempos de imersão no enraizamento de estacas de Chrysanthemum morifolium cv. White Reagan 606. O fator doses foi aplicado em quatro níveis: 0, 500, 1000 e 1500 ppm de IBA e o fator tempo em três níveis: 5s, 1h e 2h. O delineamento utilizado foi o de blocos completos casualizados com parcelas subdivididas, onde as dosagens de IBA foram aplicadas como tratamento principal. O experimento foi instalado em caixas de isopor, em casa de vegetação sob nebulização, tendo vermiculita como substrato. O momento adequado para o transplante foi avaliado através da leitura de uma repetição adicional utilizada como controle. Obteve-se enraizamento em todas as combinações de tratamento,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Crisântemo; Chrysanthemum morifolium; Enraizamento de estacas; Ácido indolbutírico (IBA).
Ano: 1992
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161992000400004

Quantitative variation for grain quality in Brazilian maize populations
Provedor de dados: 63
Autores: Mittelmann,Andréa; Miranda Filho,José Branco de; Nass,Luciano Lourenço; Lima,Gustavo Júlio Melo Monteiro de; Hara-Klein,Claudete; Silva,Ricardo Machado da.
Development of maize (Zea mays L.) cultivars with high grain protein and oil concentrations and an appropriate amino acid composition, without losses in grain yield, represents a challenge in breeding programs. The objective of this work was to study the nutritional quality of ten Brazilian maize populations evaluated in three environments. A randomized block design with six replications was used. Ear yield and the concentrations of protein, oil, serine, glutamic acid, alanine, leucine, tyrosine and phenylalanine were evaluated. Individual and combined analyses of variance were performed. Populations diverged for most of the traits. Environmental effects influenced variation for most of the traits, unlike genotype-environment interaction, allowing the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Plant breeding; Nutritional quality; Protein; Amino acids.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000100008

Field determintation of young acid lime plants transpiration by the stem heat balance method
Provedor de dados: 63
Autores: Coelho Filho,Maurício Antonio; Angelocci,Luiz Roberto; Campeche,Luís Fernando de Souza Magno; Folegatti,Marcos Vinícius; Bernardes,Marcos Silveira.
The stem heat balance method (HBM) measures sap flow (SF) in plants, and can be used to estimate daily transpiration flow. It is a powerful technique for water relations and irrigation field studies, but it has to be tested in species of particular interest. This paper discusses effectiveness of the HBM to estimate transpiration of young acid lime plants (Citrus latifolia Tan. cv. Tahiti), grafted on citrumelo cv. Swingle (Poncirus trifoliata Raf. x C. paradisi Macf.), in the field using commercial gauges (model SAG10-ws, Dynamax Inc., Huston), in Piracicaba, State of Sao Paulo, Brazil. SF was correlated to transpiration determined by weighing lysimeters and by a steady-state null-balance porometer. The mean ratio between daily values of SF and lysimetric...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: SF; Maximum transpiration; Lysimeter; Porometer; Citrus.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000300007

EFEITO DA TEMPERATURA NO PARASITISMO DE Trichogramma pretiosum  Riley, 1879 SOBRE OVOS DE Sitotroga cerealella (Olivier, 1819)
Provedor de dados: 63
Autores: INOUE,M.S.R.; PARRA,J.R.P.
Avaliou-se o efeito da temperatura no parasitismo de Trichogramma pretiosum Riley, 1879 sobre ovos de Sitotroga cerealella (Olivier, 1819), para sua utilização em criações massais e/ou para o controle biológico desta traça de grãos armazenados. Os parasitóides foram mantidos sob as temperaturas de 18, 20, 22, 25, 30 e 32°C, durante 48 horas, com umidade relativa de 60±10% e fotofase de 14 horas, em todas as condições. O parasitismo foi avaliado pela contagem do número de ovos pretos (característica do parasitismo) e pelo número de parasitóides emergidos. As altas temperaturas foram favoráveis ao desempenho de T. pretiosum que, a 30°C teve 97,6% das fêmeas parasitando, com uma média de 18,8 ovos parasitados em 48 horas e com uma viabilidade de 88,5%.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Controle biológico; Grãos armazenados; Sitotroga; Trichogramma.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000200009

Surface application of lime ameliorates subsoil acidity and improves root growth and yield of wheat in an acid soil under no-till system
Provedor de dados: 63
Autores: Caires,Eduardo Fávero; Corrêa,José Cristovão Leal; Churka,Susana; Barth,Gabriel; Garbuio,Fernando José.
Crop root growth and grain yield can be affected by chemical modifications in the soil profile due to surface lime application. A field trial was carried out on a loamy dystrophic Typic Hapludox at Ponta Grossa, State of Paraná, Brazil, to evaluate root growth and grain yield of wheat (Triticum aestivum L. cv. CD 104, moderately susceptible to Al), about 10 years after surface liming (0, 2, 4, and 6 Mg ha-1) and three years after surface re-liming (0 and 3 Mg ha-1), in a long-term no-till cultivation system. Soil acidity limited wheat root growth and yield severely, probably as a result of extended water deficits during the vegetative stage. Surface liming caused increases up to 66% in the root growth (0-60 cm) and up to 140% in the grain yield. Root...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Triticum aestivum L.; Dolomitic lime; Aluminum; Calcium.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000500013

Field methods for the study of ants in sugarcane plantations in Southeastern Brazil
Provedor de dados: 63
Autores: Souza,Débora Rodrigues de; Stingel,Erich; Almeida,Luiz Carlos de; Lazarini,Marco Antônio; Munhae,Catarina de Bortoli; Bueno,Odair Correa; Archangelo,Claudinei Rogério; Morini,Maria Santina de C.
The harvest of sugarcane is still traditionally done manually with the burning of straw in most cultivated areas in Brazil. However, burning has been gradually eliminated with the relatively recent use of mechanical harvesting. This will result in significant changes in the agroecosystem, as the straw will remain in the field. No investigation on Formicidae found in sugarcane plantations in Southeastern Brazil harvested by this new system has been done yet. Because of their feeding habits, many species of this family may act as predators of several sugarcane pests. In this study, the sampling efficacy of pitfall traps, baits, and underground traps with two types of attractants were evaluated. Pitfall traps gave the largest richness, while abundance was the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pitfall; Underground traps; Baits; Predatory ants; Sampling methods.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000600006

Albumen protein and functional properties of gelation and foaming
Provedor de dados: 63
Autores: Alleoni,Ana Cláudia Carraro.
Hen eggwhite proteins have been extensively utilized as ingredients in food processing because of their unique functional properties, such as gelling and foaming. This work reviews the molecular basis of the eggwhite proteins targeting the development of these functional properties during processing.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ovalbumin; Coagulation; Gel; Denaturation.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000300013

Temperatura do ar, rendimento de grãos de milho e caracterização fenológica associada à soma calórica
Provedor de dados: 63
Autores: Gadioli,João Luiz; Dourado-Neto,Durval; García y García,Axel; Valle Basanta,Maria del.
Com os objetivos de avaliar o efeito da temperatura média do ar no rendimento de grãos e de prever a época de ocorrência dos estádios fenológicos da cultura de milho em função da soma calórica, foi conduzido um experimento de campo utilizando três híbridos, com diferentes exigências térmicas, em três diferentes épocas de semeadura. Para estimativa do rendimento de grãos foram determinados seus diferentes componentes, onde se observou um decréscimo do rendimento com aumento da temperatura em função das épocas de semeadura utilizadas. A fenologia foi associada ao número relativo de graus-dia, onde se observou uma relação linear. Há uma temperatura média do ar correspondente ao máximo rendimento de grãos, e os estádios fenológicos da cultura podem ser...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Milho; Fenologia; Graus-dia.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000300001

Haematological and gill responses in parasitized tilapia from valley of Tijucas River, SC, Brazil
Provedor de dados: 63
Autores: Azevedo,Tatiana Maslowa Pegado de; Martins,Maurício Laterça; Bozzo,Fabiana Rizzi; Moraes,Flávio Ruas de.
In the State of Santa Catarina there is no information about haematological and parasitological characteristics of fish maintained in feefishing operations and manured ponds. This work compared the haematological characteristics of Nile tilapia parasitized or not, captured in a property situated in Nova Trento, SC, Brazil, between August 2003 and July 2004. During the studied period, the water temperature, pH, dissolved oxygen, alkalinity, ammonia and transparency were measured. Ten fish were collected monthly either in a feefishing or in a pond receiving pig manure, and anesthetized with benzocaine solution for haematological, parasitological and histopathological exams. From a total of 360 analyzed fish, 64 (17.8%) were parasitized with Cichlidogyrus...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Oreochromis niloticus; Santa Catarina; Parasitism; Haematology; Histopathology.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000200002

TESTES DE CONDUTIVIDADE ELÉTRICA PARA AVALIAÇÃO DO VIGOR DE SEMENTES DE SOJA  (Glycine max (L.) Merrill)
Provedor de dados: 63
Autores: DIAS,D.C.F.S; MARCOS FILHO,J.
O presente trabalho teve como objetivo investigar a possibilidade de redução do período de condicionamento das sementes nos testes de condutividade elétrica, nos sistemas de massa e individual, e consequentemente, obter indicações mais rápidas sobre a qualidade fisiológica dos lotes. Para tanto, foram utilizados quatro lotes de sementes de soja das variedades IAC-8 e IAC-15 que foram submetidos a estudos específicos de condutividade elétrica de massa e individual (ASA-610), empregando-se períodos de condicionamento de 4, 8, 12, 16, 20 e 24 horas. No sistema de massa foram utilizadas amostras de sementes não danificadas e de sementes fisicamente puras. Nos estudos com o ASA-610 foram testadas as intensidades de corrente elétrica de 95 a 45 mA/semente, em...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycine max; Sementes; Vigor; Condutividade elétrica.
Ano: 1996
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161996000100005

Do soil fertilization and forest canopy foliage affect the growth and photosynthesis of Amazonian saplings?
Provedor de dados: 63
Autores: Magalhães,Nilvanda dos Santos; Marenco,Ricardo Antonio; Camargo,Miguel Angelo Branco.
Most Amazonian soils are highly weathered and poor in nutrients. Therefore, photosynthesis and plant growth should positively respond to the addition of mineral nutrients. Surprisingly, no study has been carried out in situ in the central Amazon to address this issue for juvenile trees. The objective of this study was to determine how photosynthetic rates and growth of tree saplings respond to the addition of mineral nutrients, to the variation in leaf area index of the forest canopy, and to changes in soil water content associated with rainfall seasonality. We assessed the effect of adding a slow-release fertilizer. We determined plant growth from 2010 to 2012 and gas exchange in the wet and dry season of 2012. Rainfall seasonality led to variations in...
Tipo: Info:eu-repo/semantics/article
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162014000100008

Propriedades físicas de um Cambissolo Húmico afetadas pelo tipo de manejo do solo
Provedor de dados: 63
Autores: Bertol,Ildegardis; Beutler,Josué Fernando; Leite,Dirceu; Batistela,Odair.
A degradação das propriedades físicas do solo é um dos principais processos responsáveis pelo aumento da erosão hídrica. O preparo convencional predispõe o solo a este processo, já que é executado com intenso revolvimento mecânico do solo. A semeadura direta, por outro lado, é um sistema de manejo conservacionista, pois a ausência de preparo mantém os resíduos vegetais e aumenta o teor de matéria orgânica na superfície, apesar de aumentar a densidade e diminuir a porosidade superficial do solo. O trabalho foi desenvolvido num CAMBISSOLO HÚMICO alumínico, em Lages- SC, de maio de 1995 a novembro de 1999, com o objetivo de avaliar as modificações em algumas propriedades físicas do solo afetadas pelo manejo. Os tratamentos foram, preparo convencional...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Preparo conservacionista; Resistência do solo; Estabilidade de agregados; Infiltração de água.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000300018

Quantifying herbage mass on rotationally stocked palisadegrass pastures using indirect methods
Provedor de dados: 63
Autores: Braga,Gustavo José; Pedreira,Carlos Guilherme Silveira; Herling,Valdo Rodrigues; Luz,Pedro Henrique de Cerqueira; Marchesin,Wilson Aparecido; Macedo,Felipe Barros.
Indirect, non-destructive methods for estimating herbage mass on pasture may help growers to better estimate herbage mass and manage the grazing process. The objective of this study was to evaluate two methods for estimating herbage mass on Marandu palisadegrass [Brachiaria brizantha (A. Rich.) Stapf] pastures, over two grazing seasons. The relationships between herbage mass and two indirect, non-destructive measurements (sward surface height - SSH and rising plate meter - RP) were analyzed via regression analysis. Mean determination coefficients (r²) for the regression models were 0.82 and 0.91 for RP and SSH, respectively. Time within season influenced both slope (b) and intercept (a) of the regression models in both methods. The change in model...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Brachiaria brizantha; Sward surface height; Herbage allowance; Rising plate meter; Linear regression.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000100018

Organic matter quality in a soil cultivated with perennial herbaceous legumes
Provedor de dados: 63
Autores: Canellas,Luciano Pasqualoto; Espindola,José Antonio Azevedo; Rezende,Carlos Eduardo; Camargo,Plínio Barbosa de; Zandonadi,Daniel Basílio; Rumjanek,Victor Marcos; Guerra,José Guilherme Marinho; Teixeira,Marcelo Grandi; Braz-Filho,Raimundo.
Using herbaceous legumes in agricultural systems yields great quantities of plant residues, allowing changes in soil organic matter quality and content over the years. This study was conducted on an Ultisol, at Seropédica, RJ, Brazil, to evaluate the effects of different perennial herbaceous legumes on soil organic matter quality. A factorial scheme with three replications was used to evaluate the species: forage groundnut cv. BR-14951 (Arachis pintoi), tropical kudzu (Pueraria phaseoloides), and siratro (Macroptilium atropurpureum). After the first cut, each plot was divided into two subplots; plants were cut and left on the soil surface or cut and removed. Soil samples of a closed area covered by spontaneous vegetation (mainly C3 plants) or by Panicum...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: FTIR; Fluorescence; Humic acids; Humic substances; 13C.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000100010

Zinc availability for corn grown on an oxisol amended with flue dust
Provedor de dados: 63
Autores: Santos,Gláucia Cecília Gabrielli dos; Berton,Ronaldo Severiano; Camargo,Otávio Antônio de; Abreu,Mônica Ferreira de.
The costs related to the construction and maintenance of industrial landfills, and the environmental risks that they may represent, have increased the interest of several types of industries in studying the possibility of applying residues to agricultural soils. This study evaluates the efficiency of flue dust as a zinc source for corn, and the zinc availability for corn evaluated by four methods. A greenhouse experiment carried out at Campinas, SP, Brazil, evaluated the effect of two zinc sources (flue dust and zinc sulphate), at three rates (5, 50 and 150 mg dm-3), in one soil (Rhodic Hapludox) under two pH conditions (5.0 and 6.0). The treatments were arranged in a randomized factorial scheme design with three replications. Zinc availability indexes...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: DTPA; Heavy metals; Industrial wastes; Speciation; Soil pH.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000600008

ABSORÇÃO E ACUMULAÇÃO DE NUTRIENTES EM ESTÉVIA Stevia rebaudiana (Bert.) Bertoni: I. MACRONUTRIENTES
Provedor de dados: 63
Autores: Lima Filho,O.F. de; Malavolta,E; Sena,J.O.A. de; Carneiro,J.W.P.
Estudou-se a absorção e o acúmulo de macronutrientes pela estévia, em condições de cultivo comercial no campo. Foram avaliados dois índices nutricionais: Taxa de Absorção Relativa do Nutriente e Taxa de Acumulação Líquida Organogênica do Nutriente. Foram realizadas 7 coletas a cada 15 dias a partir do transplante. Pouco antes ou no início do florescimento, a produção de 1 tonelada de folhas secas exigiu, em kg: N-64,6; P-7,6; K-56,1; Ca-15,8; Mg-3,6 e S-3,6. Para a produção de sementes, correspondente a 1 tonelada de folhas secas, a extração de macronutrientes, em kg, foi: N-130; P-18,8; K-131,5; Ca-43,7; Mg-8,3 e S-9,7.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Estévia; Nutrição mineral; Macronutrientes; Marcha de absorção; Taxa de absorção.
Ano: 1997
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161997000100003

Perda de rendimento potencial da cultura do girassol por deficiência hídrica, no Estado de São Paulo
Provedor de dados: 63
Autores: Marin,Fábio Ricardo; Sentelhas,Paulo Cesar; Ungaro,Maria Regina Gonçalves.
O presente trabalho teve por objetivo estimar a perda potencial de rendimento para 36 épocas de semeadura, para a cultura do girassol, em três localidades do Estado de São Paulo: Piracicaba, Ribeirão Preto e Manduri. As estimativas basearam-se nas chances de atendimento das exigências hídricas da cultura e, para tanto, utilizou-se o método da "Zona Agroecológica" para estimativa do rendimento potencial, e o método da FAO de Doorenbos &amp;amp; Kassam, para o cálculo da quebra relativa de rendimento devida à deficiência hídrica, a qual foi estimada pelo balanço hídrico da cultura. Utilizando-se séries históricas que variaram de 28 a 40 anos, foram obtidos resultados que possibilitaram identificar épocas de semeadura de menores riscos para o cultivo do...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Helianthus annus; Época de semeadura; Balanço hídrico.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000100002

Comportamento da laranjeira Piralima sobre Poncirus trifoliata com variações na altura de enxertia
Provedor de dados: 63
Autores: Sampaio,V.R.
Pesquisou-se a combinação de laranjeira Piralima, Citrus sinensis (L.) Osb. sobre Poncirus trifoliata (L.) Raf. fazendo-se variações nas alturas das enxertias, com operações efetuadas a zero, dez, vinte e quarenta centímetros de altura. Avaliações realizadas após seis anos e meio de implantação do experimento permitiram as seguintes conclusões: 1) as alturas das enxertias afetaram o desenvolvimento global das plantas, com as enxertias mais altas reforçando o efeito ananicante do Poncirus trifoliata; 2) as diferentes alturas de enxertia não afetaram as produções de frutos das três primeiras produções comerciais. Na quarta colheita surgiu diferença entre os tratamentos extremos, com maiores produções acontecendo para plantas enxertadas próximas ao solo; 3) o...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Laranja Piralima; Poncirus trifoliata; Alturas de enxertia.
Ano: 1994
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000100011

Qualidade fisiológica de sementes de seringueira (Hevea brasiliensis Muell. Arg.), tratadas com benlate durante o armazenamento
Provedor de dados: 63
Autores: Vieira,R.D.; Bergamaschi,M.C.M.; Minohara,L.
A ocorrência de um período relativamente frio e seco, imediatamente após o período de coleta de sementes de seringueira - Hevea brasiliensis Muell. Arg. (março-abril), levou à realização do presente trabalho com o objetivo de encontrar condições adequadas de preservação da qualidade fisiológica das sementes. Assim, estudou-se a qualidade fisiológica de sementes, tratadas com Benlate (0,1%), e armazenadas em sacos de polietileno transparente, por períodos de 0 a 5 meses, sob condições ambientais de laboratório. Para a avaliação da qualidade fisiológica das sementes, determinou-se a germinação e o vigor através do índice de velocidade de emergência (IVE) e do comprimento da parte aérea das plântulas (CPA), em 1987 e 1988. A germinação e o IVE foram obtidos...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Qualidade de semente; Germinação; Vigor.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000100025

Contagem de células somáticas e características produtivas de vacas da raça holandesa em lactação
Provedor de dados: 63
Autores: Pereira,Alfredo Ribeiro; Machado,Paulo Fernando; Sarríes,Gabriel Adrian.
A mastite subclínica, diagnosticada através da contagem de células somáticas, afeta negativamente a pecuária leiteira diminuindo a produção de leite e de gordura. Este estudo foi realizado com o objetivo de se quantificar o efeito do nível de células somáticas, transformado para escore linear (EL), sobre a produção de leite e gordura em 305 dias de lactação, produção de leite no pico e duração da lactação de bovinos da raça holandesa. Foram levantadas informações referentes a 147 lactações encerradas de vacas da raça holandesa (83 primíparas e 64 multíparas), de um rebanho confinado do Estado de São Paulo. As análises estatísticas foram realizadas utilizando-se o procedimento de modelo lineares generalizados. Contrariando a literatura, as características...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: CCS; Mastite; Produção de leite; Produção de gordura; Duração da lactação.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000400001

Sugarcane maturity estimation through edaphic-climatic parameters
Provedor de dados: 63
Autores: Scarpari,Maximiliano Salles; Beauclair,Edgar Gomes Ferreira de.
Sugarcane (Saccharum officinarum L.) grows under different weather conditions directly affecting crop maturation. Raw material quality predicting models are important tools in sugarcane crop management; the goal of these models is to provide productivity estimates during harvesting, increasing the efficiency of strategical and administrative decisions. The objective of this work was developing a model to predict Total Recoverable Sugars (TRS) during harvesting, using data related to production factors such as soil water storage and negative degree-days. The database of a sugar mill for the crop seasons 1999/2000, 2000/2001 and 2001/2002 was analyzed, and statistical models were tested to estimate raw material. The maturity model for a one-year old...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sucrose; Predicting; Quality; Mathematical model; Climatology.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000500004

Vigor de sementes de populações de aveia preta: II. Desempenho e utilização de nitrogênio
Provedor de dados: 63
Autores: Schuch,Luis Osmar Braga; Nedel,Jorge Luis; Assis,Francisco Neto de; Maia,Manoel de Souza.
O efeito do vigor das sementes e das possíveis interações com a variação na população de plantas (150, 300 e 450 pl/m2), sobre o desempenho a campo de dois cultivares de aveia preta (Avena strigosa Schreb), e sobre alguns componentes envolvidos na utilização do nitrogênio, foi avaliado neste trabalho. O rendimento biológico na antese e na maturação, a remobilização de nitrogênio, a eficiência de remobilização e de utilização de nitrogênio, a concentração de nitrogênio nos tecidos na maturação e a qualidade fisiológica das sementes produzidas, não foram afetados pela diferença nos níveis de vigor das sementes e pela variação na população de plantas. O rendimento de grãos e os componentes do rendimento não foram afetados pelo nível de vigor das sementes,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Avena strigosa; Rendimento de grãos; Índice de colheita; Nitrogênio.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000100020

Phenology of the oil palm interspecific hybrid Elaeis oleifera × Elaeis guineensis
Provedor de dados: 63
Autores: Hormaza,Paola; Fuquen,Eloina Mesa; Romero,Hernán Mauricio.
Oil palm is one of the most important oil crops in the world. Because of its high productivity and perennial nature, it has been expanding quickly. Commercial plantations consist mostly of the African palm E. guineensis Jacq. However, producers in Latin America are increasingly planting the O × G interspecific hybrid, a cross between African palm (E. guineensis) and the American palm (E. oleifera (Kunth) Cortés). This interspecific hybrid has emerged as a promising solution to diseases such as the bud rot of oil palm because of the apparent partial resistance of this genotype to the disease. This work studied and described the phenology of the O × G interspecific hybrid. The phenology stages were coded using the BBCH scale. The scale for the phenophases...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: BBCH scale; Degree-days; Phenophase.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162012000400007

ENRAIZAMENTO DE CRAVO (Dianthus caryophyllus L.) IN VITRO E EX VITRO
Provedor de dados: 63
Autores: CUZZUOL,G.R.F; GALLO,L.A; CROCOMO,O.J.
Plântulas de cravo (Dianthus caryophyllus) micropropagadas durante várias gerações pelo período de um ano, foram enraizadas in vitro com AIA, ANA e AIB nas concentrações de 0,0; 0,25; 0,5 e 1,0 mg/l, em fatorial do tipo 3 x 4, com todos os tratamentos promovendo a formação de raízes, mas não diferindo do controle. Foi confrontado em condição autotrófica, o desempenho entre plântulas enraizadas in vitro na presença e ausência do regulador AIA 0,5 mg/l e plântulas enraizadas ex vitro, sem nenhuma diferença quanto ao comprimento da parte aérea. Para a variável produção de massa de matéria seca os melhores resultados foram proporcionados pelas plantas que passaram pela fase de enraizamento in vitro, tendo o sistema radicular efeito sinergístico no crescimento...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dianthus caryophyllus; Cravo; Micropropagação; Enraizamento.
Ano: 1996
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161996000100008

Efficiency in the use of phosphorus by common bean genotypes
Provedor de dados: 63
Autores: Silva,Daiana Alves da; Esteves,José Antônio de Fátima; Messias,Ueliton; Teixeira,Aurélio; Gonçalves,João Guilherme Ribeiro; Chiorato,Alisson Fernando; Carbonell,Sérgio Augusto Morais.
Common bean (Phaseolus vulgaris L.) is frequently grown in weathered soils with low phosphorus (P) availability, and this is one of the main limitations on its production. This study aimed to assess 20 common bean genotypes in a hydroponic system to select the best P concentration for inducing nutritional deficiency and to classify the genotypes in terms of nutrient utilization efficiency. The concentrations of P applied were 8.00, 4.00, 2.00 and 0.05 mg L¹. At 21 days, in the plot subjected to an application of the most severe stress, the 0.05 mg L¹ dose of P, had smaller plant size and early leaf abscission was observed. The 4.00 mg L¹ dose of P was the most efficient in inducing stress for discrimination of cultivars in terms of efficiency of use of P....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phaseolus vulgaris L.; Phosphorus nutrition; Classification of genotypes for P; Hydroponics; P deficiency.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162014000300008

First-order decay models to describe soil C-CO2 Loss after rotary tillage
Provedor de dados: 63
Autores: La Scala Jr.,Newton; Lopes,Afonso; Spokas,Kurt; Archer,David Walter; Reicosky,Donald.
To further understand the impact of tillage on CO2 emission, the applicability of two conceptual models was tested, which describe the CO2 emission after tillage as a function of the non-tilled emission plus a correction due to the tillage disturbance. Models assume that C in readily decomposable organic matter follows a first-order reaction kinetics equation as: dCsoil (t) / dt = -k Csoil (t), and that soil C-CO2 emission is proportional to the C decay rate in soil, where Csoil(t) is the available labile soil C (g m-2) at any time (t) and k is the decay constant (time-1). Two possible assumptions were tested to determine the tilled (F T) fluxes: the decay constants (k) of labile soil C before and after tillage are different (Model 1) or not (Model 2)....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil respiration; Soil tillage; Soil organic matter; Labile carbon decay.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000500010

Efeitos da aplicação de reguladores vegetais e do ácido bórico, em estacas de lichieira (Litchi chinensis Sonn.)
Provedor de dados: 63
Autores: Leonel,S.; Rodrigues,J.D.
Estudaram-se as interações entre os ácidos indol-butírico, alfa-naftaleno-acético e bórico no desenvolvimento de calos e na sobrevivência das estacas de lichieira (Litchi chinensis Sonn.). As estacas apresentavam 25 cm de comprimento e 4 folhas cortadas pela metade, sendo retiradas em duas épocas diferentes (janeiro e abril) e colocadas para enraizar em bandejas de isopor, tendo como substrato vermiculita e em condições de câmara de nebulização. Foi feita imersão de 2,5 cm da base das estacas, em soluções aquosas por l minuto. Os tratamentos utilizados corresponderam a 5.000 e 2.000 ppm de IBA; 3.000 e 1.500 ppra de NAA; 150 microgramas/ml de H3BO3; IBA 5.000 e 2.000 ppm + H3BO(3)150 microgramas/ml; NAA 3.000 e 1.500 ppm + H3BO3 150 microgramas/ml e H2O....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ácido indol-butírico; Ácido naftaleno-acético; Propagação vegetativa.
Ano: 1993
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161993000100006

Physicochemical characteristics and fatty acid composition of tomato seed oils from processing wastes
Provedor de dados: 63
Autores: Cantarelli,P.R.; Regitano-d'Arce,M.A.B.; Palma,E.R.
The major component of tomato processing industry wastes is seed. Samples of tomato (Petomech var.) pomace from industries of São Paulo state submitted to Hot and Cold Break treatments, were spontaneously fermented and washed to separate seeds. The oils were analysed for specific gravity, iodine and saponifícation numbers, refractive index, viscosity and fatty acid composition. Except for saponifícation number, Hot and Cold Break seed oils were very similar. In both treatments palmitic acid was the major saturated fatty acid, followed by stearic acid. Linoleic acid was the major unsaturated fatty acid followed by oleic acid. Both oleic and linoleic acids added up to over 60% of total fatty acids, being higher in Cold Break seed oils. Both treatments...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Tomato seed oil; Fatty acid composition; Physicochemical characteristics; Industrial wastes.
Ano: 1993
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161993000100016

Extratores de cápsulas porosas para o monitoramento da condutividade elétrica e do teor de potássio na solução de um solo
Provedor de dados: 63
Autores: Silva,Ênio Farias de França e; Anti,Gláucia Regina; Carmello,Quirino Augusto de Camargo; Duarte,Sérgio Nascimento.
Este trabalho teve como objetivo avaliar a utilização de extratores de cápsulas porosas no monitoramento da condutividade elétrica e da concentração de potássio na solução do solo, em uma área cultivada com tomates e fertirrigada com três níveis de potássio e frequências de aplicação de um e três dias. Os valores de condutividade elétrica e concentração de potássio encontrados na solução do solo foram corrigidos para a umidade da pasta saturada, em função das diferentes umidades do solo no momento da extração. Os valores de condutividade elétrica obtidos com os extratores de cápsulas porosas e corrigidos para a umidade da pasta subestimaram os medidos no extrato da pasta saturada em torno de 16%. Para as concentrações de potássio, a mesma tendência foi...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Cápsulas porosas; Condutividade elétrica; Potássio; Fertirrigação.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000400030

Characterization of rust, early and late leaf spot resistance in wild and cultivated peanut germplasm
Provedor de dados: 63
Autores: Fávero,Alessandra Pereira; Moraes,Sérgio Almeida de; Garcia,Antonio Augusto Franco; Valls,José Francisco Montenegro; Vello,Natal Antonio.
Groundnut (Arachis hypogaea) has an AB genome and is one of the most important oil crops in the world. The main constraints of crop management in Brazil are fungal diseases. Several species of the genus Arachis are resistant to pests and diseases. The objective of our experiments was to identify wild species belonging to the taxonomic section Arachis with either A or B (or " non-A" ) genomes that are resistant to early leaf spot (Cercospora arachidicola), late leaf spot (Cercosporidium personatum) and rust (Puccinia arachidis). For the identification of genotypes resistant to fungal diseases, bioassays with detached leaves were done in laboratory conditions, with artificial inoculation, a controlled temperature of 25ºC and a photoperiod of 10 h light/14 h...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Puccinia arachidis; Cercospora arachidicola; Cercosporidium personatum; Groundnut; Arachis spp.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000100015

Endophytic fungi from Brachiaria grasses in Brazil and preliminary screening of Sclerotinia sclerotiorum antagonists
Provedor de dados: 63
Autores: Gama,Danielly de Souza; Santos,Ítalo Augusto Férrer Melo; Abreu,Lucas Magalhães de; Medeiros,Flávio Henrique Vasconcelos de; Duarte,Whasley Ferreira; Cardoso,Patrícia Gomes.
ABSTRACT: Fungal endophytes of Brachiaria, a nonhost of Sclerotinia sclerotiorum, may harbor species with antagonistic effects against this plant pathogen. The objective of this work was to investigate the diversity of endophytic fungi associated with different Brachiaria species and hybrids and evaluate their potential to inhibit the plant pathogen S. sclerotiorum. Stem samples from 39 Brachiaria spp. plants were collected in pasture fields and experimental areas of three states of Brazil resulting in 74 endophytes isolated. Twenty-eight species were identified by sequences of the Internal Transcribed Spacer (ITS) and 18S rDNA regions. Paraconiothyrium sp. was the most abundant endophyte, accounting for 24 % (14 isolates) of total, and it was isolated...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coniothyrium-like fungi; Urochloa; Tropical forage grasses; Antagonism; White mold.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000300200

O EQUIVALENTE EM CARBONATO DE CÁLCIO DOS CORRETIVOS DA ACIDEZ DOS SOLOS
Provedor de dados: 63
Autores: ALCARDE,J.C.; RODELLA,A.A.
Os corretivos da acidez dos solos podem ter dois equivalentes em carbonato de cálcio: um, calculado pelos teores de cálcio e magnésio utilizando a expressão: % CaO x 1,79 + % MgO x 2,48 = %ECaCO3; outro, determinado analiticamente pelo poder ou valor de neutralização. Para uma mesma amostra ambos os valores deveriam coincidir, o que raramente acontece. Diversas hipóteses foram levantadas para justificar essa diferença. Os resultados deste trabalho permitiram inferir que nem todo o cálcio e magnésio dos corretivos devem estar associados às bases quimicamente efetivas mas também a fosfato, sulfato ou outras bases de forças inexpressivas; também os constituintes neutralizantes podem estar aprisionados em cristais de outros componentes dos corretivos, como...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Corretivos de acidez; Equivalente em carbonato; Poder de neutralização.
Ano: 1996
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161996000200002

Monitoring the understory in eucalyptus plantations using airborne laser scanning
Provedor de dados: 63
Autores: Melo,Alessandra Morais; Reis,Cristiano Rodrigues; Martins,Bruno Ferraz; Penido,Tamires Mousslech Andrade; Rodriguez,Luiz Carlos Estraviz; Gorgens,Eric Bastos.
ABSTRACT In eucalyptus plantations, the presence of understory increases the risk of fires, acts as an obstacle to forest operations, and leads to yield losses due to competition. The objective of this study was to develop an approach to discriminate the presence or absence of understory in eucalyptus plantations based on airborne laser scanning surveys. The bimodal canopy height profile was modeled by two Weibull density functions: one to model the canopy, and other to model the understory. The parameters used as predictor in the logistic model successfully discriminated the presence or absence of understory. The logistic model composed by ℽ canopy, ℽ understory, and ℽ understory showed higher values of accuracy (0.96) and kappa (0.92), which means an...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: LiDAR; Remote sensing; Weed control; Understory vegetation.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000101001

Vigor-S, a new system for evaluating the physiological potential of maize seeds
Provedor de dados: 63
Autores: Castan,Danielle Otte Carrara; Gomes-Junior,Francisco Guilhien; Marcos-Filho,Julio.
ABSTRACT: The refinement of vigor tests and the possibility of utilizing computer resources for the effective evaluation of the seed physiological potential have attracted considerable interest from research and seed technologists. The aim of this study was to evaluate the physiological potential of maize seeds using the newly-created Automated Analysis of Seed Vigor System (Vigor-S) compared with other recommended seed vigor tests; two maize hybrids were used, each represented by seven seed lots. Germination and vigor (cold test, saturated salt accelerated aging, and field seedling emergence) evaluations were conducted. For the evaluation of seed vigor with the use of seedling image analysis resources, two systems were compared: the Seed Vigor Imaging...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays L.; Image analysis; Computer vision; Seedling vigor.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162018000200167

Numerical study of upstream disturbances on the performance of electromagnetic and ultrasonic flowmeters
Provedor de dados: 63
Autores: Palau,Carmen Virginia; Bomfim,Guilherme Vieira do; Azevedo,Benito Moreira de; Peralta,Iban Balbastre.
ABSTRACT Electromagnetic and ultrasonic flowmeters are high precision devices that can measure the water flow in pressurized irrigation networks. In these networks, the inadequate installation distance of flow control valves generates upstream disturbances which will increase measurement errors and reduce the accuracy of the equipment. Therefore, estimating these errors is important to establishing the correct installation distance of the hydraulic accessories and to ensuring the metrological reliability of the flowmeters. This work proposes a numerical study using Computational Fluid Dynamics to evaluate water flow behavior in pipes and estimate measurement errors caused by gate and butterfly valves in installation configurations found at pressurized...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: CFD; Pressurized irrigation; Water flowmeter; Water supply network.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000401602

Genetic correlation between traits in the ESALQ-PB1 maize population divergently selected for tassel size and ear height
Provedor de dados: 63
Autores: Farias Neto,Austeclínio Lopes; Miranda Filho,José Branco de.
Full-sib and selfed (S1) progenies were obtained from sub-populations of ESALQ-PB1, divergently selected for tassel size (T+ and T-) and ear height (E+ and E-), and used for estimating genetic and phenotypic correlation coefficients between traits. The analyzed traits were: EW- total ear weight (g/plant), PH- plant height (cm), EH- ear height (cm), TB- tassel branch number and TL- tassel length. The highest genetic (rG) and phenotypic (rF) correlation was observed for the combination PH x EH, as expected, with average of 0.800 and 0.778, respectively over sub-populations and locations. It is apparent that divergent selection for tassel size did not affect greatly the correlation between PH and EH in the full sib progenies, but in the inbred progenies the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays; Genetic correlation; Divergent selection; Tassel size; Ear height.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000100018

Organic matter fractions and soil fertility under the influence of liming, vermicompost and cattle manure
Provedor de dados: 63
Autores: Yagi,Renato; Ferreira,Manoel Evaristo; Cruz,Mara Cristina Pessôa da; Barbosa,José Carlos.
This work evaluates effects of cattle manure vermicompost in association with liming on soil fertility indexes. The experiment was carried out in greenhouse conditions, in pots containing samples of a Typic Hapludox, medium-textured soil. Five levels of vermicompost (equivalent to 0, 28, 42, 56, and 70 t ha-1, dry weight) and five liming levels (to raise base saturation to 20, 30, 40, 50, and 60%) were combined in a factorial scheme and samples were incubated for 180 days. Samples of the same soil received the equivalent to 70 t ha-1 of the cattle manure used to produce the vermicompost, and the same lime rates. Cattle manure was better than vermicompost to supply K and Mg. Small differences in P supply were observed between the manures. The vermicompost...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Manure; PH; Fulvic acids; Humic acids; Humin.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000300021

Genetic diversity of table grape based on morphoagronomic traits
Provedor de dados: 63
Autores: Leão,Patrícia Coelho de Souza; Cruz,Cosme Damião; Motoike,Sérgio Yoshimitsu.
The conservation and characterization of grape (Vitis spp) genetic resources in germplasm banks have been the basis of its use in breeding programs that result in development of new cultivars. There are at least 10,000 grape cultivars kept in germplasm collection. The genetic diversity in 136 table grape accessions from the state of Bahia, Brazil, was evaluated. Continuous and discrete morphoagronomic traits were assessed. The clustering analysis by the Tocher otimization method resulted in 30 clusters (considering continuous morphoagronomic traits), and 9 clusters (taking into consideration multicategorical traits). There was no agreement between clusters obtained by both, continuous or discrete phenotypic descriptors, independent of the cluster method...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vitis spp; Genetic resources; Grape; Multivariate analysis.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000100007

Definition of management zones in coffee production fields based on apparent soil electrical conductivity
Provedor de dados: 63
Autores: Valente,Domingos Sárvio Magalhães; Queiroz,Daniel Marçal de; Pinto,Francisco de Assis de Carvalho; Santos,Nerilson Terra; Santos,Fábio Lúcio.
Fertilizer application at variable rates requires dense sampling to determine the resulting field spatial variability. Defining management zones is a technique that facilitates the variable-rate application of agricultural inputs. The apparent electrical conductivity of the soil is an important factor in explaining the variability of soil physical-chemical properties. Thus, the objective of this study was to define management zones for coffee (Coffea Arabica L.) production fields based on spatial variability of the apparent electrical conductivity of the soil. The resistivity method was used to measure the apparent soil electrical conductivity. Soil samples were collected to measure the chemical and physical soil properties. The maps of spatial variability...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coffea Arabica L.; Geostatistics; Fuzzy k-means; Soil sensors.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162012000300001

O pH da calda de aplicação e a absorção de ácido giberélico por frutas de laranja cv. ‘Valência’
Provedor de dados: 63
Autores: Casagrande Jr.,João Guilherme; Fachinello,José Carlos; Faria,João Luiz Carvalho.
Com o objetivo de estudar os efeitos que o ácido giberélico causa em frutas de laranja ‘Valência’, quando aplicado em diferentes concentrações, e também sob diferentes pH na calda de aplicação, foi realizado experimento onde os tratamentos consistiram de 5 concentrações (0, 5, 10, 15 e 20 ppm) e 3 pHs (3, 4,5 e 6). A aplicação foi feita em maio, quando as frutas estavam com coloração verde-amarelada, e as coletas para avaliação feitas a cada 30 dias, até o mês de novembro. Foram feitas 7 coletas no total. As variáveis estudadas foram coloração da epiderme, espessura da casca, pH do suco, acidez total titulável (ATT), teor de sólidos solúveis totais (SST), relação SST/ATT, índice tecnológico e rendimento de suco. Os resultados obtidos não permitiram...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Citrus sinensis; Laranja Valência; Ácido giberélico; Maturação.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000400021

Variabilidade da dormência de sementes entre e dentro de espécies de Sesbania
Provedor de dados: 63
Autores: Veasey,Elizabeth Ann; Freitas,José Costa Teixeira de; Schammass,Eliana Aparecida.
Analisou-se a variabilidade existente entre espécies e entre famílias de Sesbania Scop., com relação ao grau de dormência das sementes. Foram avaliadas 13 famílias de cinco espécies de Sesbania: S. rostrata, S. exasperata, S. tetraptera, S. sesban e S. virgata. O ensaio foi conduzido à temperatura alternada de 20-30°C, durante 15 dias. Utilizou-se o delineamento inteiramente casualizado, com três repetições de 50 sementes cada repetição. Foi realizada uma análise de variância, desdobrando-se os graus de liberdade de famílias dentro de espécies. Foram estimados o coeficiente de variação genética (CVg) e o coeficiente de determinação genotípica (b). Foi também avaliada a velocidade de germinação, medida indiretamente através do tempo médio para germinação...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Germinação; Parâmetro genético.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000200017

Root distribution of rootstocks for 'Tahiti' lime
Provedor de dados: 63
Autores: Neves,Carmen Silvia Vieira Janeiro; Murata,Ives Massanori; Stenzel,Neusa Maria Colauto; Medina,Cristiane de Conti; Borges,Andrey Vetorelli; Okumoto,Sergio Hideki; Lee,Roberto Huo Chian; Kanai,Hernandes Takeshi.
Field studies on citrus roots are important for genetic selection of cultivars and for management practices such as localized irrigation and fertilization. To characterize root systems of six rootstocks, taking into consideration chemical and physical characteristics of a clayey Typic Hapludox of the Northern State of Paraná, this study was performed having as scion the 'IAC-5 Tahiti' lime [Citrus latifolia (Yu. Tanaka)]. The rootstocks 'Rangpur' lime (C. limonia Osbeck), 'Africa Rough' lemon (C. jambhiri Lush.), 'Sunki' mandarin [C. sunki (Hayata) hort. ex Tan.], Poncirus trifoliata (L.) Raf., 'C13' citrange [C. sinensis (L.) Osb. x P. trifoliata (L.) Raf] and 'Catânia 2' Volkamer lemon (C. volkameriana Ten. &amp;amp; Pasq.) were used applying the trench...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Citrus latifolia; Root system; Trench profile method; Soil bulk density.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000100016

"Gaps of deciduousness": cyclical gaps in tropical forests
Provedor de dados: 63
Autores: Gandolfi,Sergius; Joly,Carlos Alfredo; Leitão Filho,Hermógenes de Freitas.
A new concept named "gaps of deciduousness" is introduced for the momentary annual bright places that appear under tropical and subtropical deciduous canopy trees when they are leafless, a cyclical kind of gap totally different from treefall gaps, whose importance in the regeneration ecology of these forests until now had not been discussed or evaluated. The aim of this article is to highlight the most significant aspects related to the concept of "gaps of deciduousness" and suggest the importance of developing studies to evaluate its relevance in the discussion of plant species coexistence and biodiversity maintenance in some tropical forests.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gap dynamics; Forest dynamics; Light regimes; Forest biodiversity.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000200020

Potencialidade do uso da terra na microbacia hidrográfica do córrego do ceveiro na região de Piracicaba
Provedor de dados: 63
Autores: Fiorio,Peterson Ricardo; Demattê,José Alexandre M.; Melém Júnior,Nagib Jorge; Mazza,Jairo Antonio.
O objetivo do presente trabalho foi avaliar a ocupação agrícola da Microbacia Hidrográfica do Ceveiro para o ano de 1995 e estabelecer a sua potencialidade. Para tanto, foi utilizado o Sistema de Análise Ambiental para Planejamento Agrícola. A microbacia localiza-se na região de Piracicaba, SP, com aproximadamente 1990 ha. Predominam os Podzólicos e os solos Litólicos de textura média e argilosa. O uso da terra foi determinado por fotointerpretação, cujos os limites foram digitalizados e cruzados com os dados de declividade e solos, gerando mapas de intensidade de uso e aptidão agrícola. Os dados indicaram que apenas 27% da área da bacia estava sendo utilizada adequadamente, 48% estava sendo sub-utilizada e 23% excessivamente utilizada, com sérios riscos...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aptidão agrícola; Uso da terra; Sensoriamento remoto.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000500032

Alternative procedure for the cold test for soybean seeds
Provedor de dados: 63
Autores: Vieira,Bruno Guilherme Torres Licursi; Vieira,Roberval Daiton; Krzyzanowski,Francisco Carlos; França Neto,José de Barros.
The growing demand for high quality soybean [Glycine max (L.) Merrill] seeds requires a precise seed quality control system from the seed industry. One way to accomplish this is by improving vigor testing. Cold test has been traditionally employed for corn seeds. However, it has also been used for other seed crops such as cotton (Gossypium spp.), soybean (Glycine Max), dry bean (Phaseolus vulgaris) and pea (Pisum sativum). This study was carried out with the objective of adjusting an alternative procedure for the cold test to determine soybean seed vigor. Six commercial soybean seed lots of the cultivar BRS 133 were used. The physiological potential of the seed lots was evaluated by germination on paper towel and sand box, seedling field emergence,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycine max (L.) Merrill; Physiological potential; Emergence; Vigor tests.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000500007

Genetic structure of annual ryegrass (Lolium multiflorum) populations estimated by RAPD
Provedor de dados: 63
Autores: Vieira,Eduardo Alano; Castro,Caroline Marques; Oliveira,Antônio Costa de; Carvalho,Fernando Irajá Félix de; Zimmer,Paulo Dejalma; Martins,Luís Fernando.
Annual ryegrass is a temperate climate annual foraging grass, grown mostly in the South of Brazil, especially in the state of Rio Grande do Sul. Despite its importance, little is known about its genetic diversity, both within and among the populations cultivated. This knowledge is of fundamental importance for developing breeding and conservation strategies. The aim of this study was to characterize the genetic diversity and structure of four populations of annual ryegrass. Three of the populations were located in Rio Grande do Sul and the fourth in Uruguay. RAPD markers were used to study the genetic diversity and structure of these populations. Analysis of 375 individuals sampled from the populations, using six RAPD primers, generated a total of 82...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Foraging; Genetic diversity; Molecular markers.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000400009

Maize yields and carbon pools in response to poultry litter, rock phosphate and P-solubilizing microorganisms
Provedor de dados: 63
Autores: Yagi,Renato; Quadros,Thainara Camila Fernandes; Martins,Bruno Henrique; Andrade,Diva Souza.
ABSTRACT: The acid release of phosphates from rock phosphates (RP) and the retention of ammonium by inorganic phosphates have been studied separately in composting; however, there is a gap in the knowledge of combined application of RP with organic residues and microorganisms. The objectives were to evaluate the combined application of fresh poultry litter (PL) with RP and P-solubilizing microorganisms (M) on soil organic matter pools, microbial biomass C (MB-C) and on whole-plant silage maize and grain yields. Two field experiments tested the effects of timing of applications of PL (8 Mg ha–1), RP (4 Mg ha–1) and microorganisms on soil organic matter pools, nutritional aspects and productive components of maize crop whole-plant silage. A second experiment...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays; Microbial biomass C; Organic C; Humin fraction C; Integrated soil fertility.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000301401

Effect of particle size of limestone on Ca, Mg and K contents in soil and in sward plants
Provedor de dados: 63
Autores: Viadé,Ana; Fernández-Marcos,María Luisa; Hernández-Nistal,Josefina; Alvarez,Esperanza.
Liming increases crop production through improved soil conditions in acidic soils. Among the effects of liming, increased availabilities of alkaline and alkaline-earth cations are worth mention. These availabilities may be affected by the particle size of applied limestone, which influences lime reactivity. The effects of particle size and application schedule of magnesium limestone were investigated on extractable Ca, Mg and K in soil, their concentrations in sward plants and dry-matter yield. Magnesium limestone of various particle sizes was applied to experimental plots at a rate of 3 t ha-1, a grass-clover sward was sown, and the plots were monitored during three years. The finest limestone (&lt; 0.25 mm) in a single application yielded the highest...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Spain; Liming; Macronutrients availability; Pasture yield.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000200010

Competition of Amaranthus species with dry bean plants
Provedor de dados: 63
Autores: Carvalho,Saul Jorge Pinto de; Christoffoleti,Pedro Jacob.
Weeds compete with field crops mainly for water, light and nutrients, and this competition is among other factors, a function of the occurrence of weed density, and the intrinsic competitive ability of each vegetal species. The objective of this research was to evaluate the competitive ability of five weed species of the Amaranthus L. genus (A. deflexus, A. hybridus, A. retroflexus, A. spinosus and A. viridis) with dry bean plants (Phaseolus vulgaris L. - 'Carioca Precoce' cultivar), using the replacement series design. A fixed total density equivalent to 80 plants m-2 was used in pots of 2.8 L capacity varying the proportions between the species in coexistence. To install the experiment, Amaranthus seedlings were transplanted to the pots at the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phaseolus vulgaris L.; Pigweed; Competitiveness; Dry mass.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000300003

Índices técnicos e rentabilidade da pecuária leiteira
Provedor de dados: 63
Autores: Oliveira,Terezinha Bezerra Albino; Figueiredo,Reginaldo Santana; Oliveira,Mauro Wagner de; Nascif,Christiano.
Avaliaram-se os resultados técnicos e econômicos em 22 propriedades leiteiras localizadas em dez municípios da Região de Viçosa, MG. Nas propriedades que apresentaram resultados econômicos negativos, detectaram-se os pontos de estrangulamento na produção e, tomando-se como referência os índices técnicos das propriedades que apresentaram taxa de retorno sobre o investimento superior ao da caderneta de poupança, foram propostas medidas para aumentar a eficiência dessas fazendas. A escala de produção foi considerada fator importante para obtenção de índices econômicos atrativos. A melhoria do padrão genético, através de inseminação artificial com sêmen de animais com maior potencial produtivo, contribuiu para elevar os índices de produtividade do rebanho, da...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Análise técnica; Análise econômica; Escala de produção.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000400006

Quantification of the soil physical quality of a tropical oxisol using the S index
Provedor de dados: 63
Autores: Tormena,Cássio Antonio; Silva,Álvaro Pires da; Imhoff,Silvia Del Carmen; Dexter,Anthony Roger.
Soil physical quality is fundamental for the sustainability of agro ecosystems. Soil physical quality assessment must be developed using parameters that describe physical behavior. S, a new soil physical parameter has recently been introduced for assessing the soil physical quality. A good soil physical quality has been associated with values of S &gt; 0.035 in soils from temperate climates. However, S has not been evaluated in tropical soils yet. Therefore we tested the hypothesis that S is a reliable soil physical quality indicator of a Typic Hapludox cropped with maize under no-tillage (NT) and conventional tillage (CT). Undisturbed samples were collected from each tillage system in the row and interrow positions. Soil bulk density was determined in the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bulk density; Tropical soils; No-tillage; Soil water retention; Soil structure.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000100008

Crescimento de raízes de cana crua e queimada em dois ciclos
Provedor de dados: 63
Autores: Alvarez,Ivan André; Castro,Paulo Roberto de Camargo e; Nogueira,Maria Cristina Stolf.
Este trabalho teve como objetivos comparar o crescimento de raízes de cana colhida crua, mecanizada e de cana após a queima, colhida manualmente; avaliar a influência do clima sobre as duas condições de crescimento e analisar o comportamento do crescimento de raízes de cana crua e cana queimada nos 1º e 2º anos de rebrota, através de curvas adaptadas. A pesquisa foi realizada no município de Morro Agudo, SP, de julho de 1995 a julho de 1997. A cultivar utilizada foi a SP 70-1143. Utilizou-se como indicadores de crescimento das raízes a matéria seca e o perfil delas no solo. Avaliou-se a influência das temperaturas e das umidades do ar e do solo sobre os tratamentos. Observou-se que o crescimento, no primeiro e no segundo ciclo, não apresentou curvas que...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cana-de-açúcar; Desenvolvimento; Sistema radicular; Ecofisiologia.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000400009

Millet seeds mixed with phosphate fertilizers
Provedor de dados: 63
Autores: Soratto,Rogério Peres; Lima,Eduardo do Valle; Mauad,Munir; Villas Boas,Roberto Lyra; Nakagawa,João.
The small size of millet seeds is the main cause for lack of uniformity at sowing, especially because most farmers do not have appropriate seeders. Mixing seeds and phosphate fertilizers would improve seeding, resulting in a better crop stand. To study the effects of such mixture on the physiological quality of seeds, millet seeds were mixed with single superphosphate or triple superphosphate (1 kg of seeds: 2.5 kg of fertilizer), and stored in plastic bags for 0, 6, 12, 24, 48, 72, 96 and 120 hours before sowing, under laboratory conditions. After storage, seeds were separated and their moisture and electrical conductivity were determined. Seeds were then submitted to germination test under laboratory conditions. Seeds mixed with fertilizer and non-mixed...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pennisetum glaucum; Germination; Vigor; Single superphosphate; Triple superphosphate.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000300024

Avaliação da qualidade de frutos de café atacados por Ceratitis capitata (Wiedemann, 1824) (Diptera: Tephritidae)
Provedor de dados: 63
Autores: Cividanes,F.J.; Nakano,O.; Melo,M.
Foram usadas plantas de Coffea arabica L., variedade Catuaí Vermelho, localizadas no Campus da Escola Superior de Agricultura "Luiz de Queiroz" - USP, Piracicaba,SP, para avaliação dos danos que Ceratitis capitata (Wied., 1824) pode causar aos frutos do cafeeiro. Os resultados mostraram que o ataque de C. capitula não causou queda prematura dos frutos, mas aumentou a queda de cerejas e foram encontradas, fortes evidências, com base na atividade da enzima polifenol oxidase e lixiviação de potássio, que cerejas atacadas podem produzir bebida de café de qualidade inferior.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ceratitis capitata; Mosca-do-mediterrâneo; Café; Polifenol oxidase; Lixiviação de potássio.
Ano: 1993
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161993000200008

Eficiência do uso da radiação e índice de colheita em trigo submetido a estresse hídrico em diferentes estádios de desenvolvimento
Provedor de dados: 63
Autores: Moreira,Mauricio Alves; Angulo Filho,Rubens; Rudorff,Bernardo Friedrich Theodor.
Durante a safra de inverno de 1995 conduziu-se um experimento de campo, em Piracicaba, SP, para analisar a eficiência do uso da radiação (&lt;FONT FACE="Symbol"&gt;e&lt;/font&gt;) e o índice de colheita (IC) do cultivar de trigo IAC-287 'YACO', quando submetido ao estresse hídrico em diferentes estádios de desenvolvimento da cultura. O delineamento foi em blocos ao acaso com cinco tratamentos e três repetições. O estresse hídrico foi aplicado nas fases de perfilhamento, espigamento, enchimento de grãos e maturação. A eficiência do uso da radiação para produção de fitomassa (&lt;FONT FACE="Symbol"&gt;e&lt;/font&gt;F) foi reduzida em 22,8 e 15,4% em relação à testemunha, quando o estresse hídrico foi aplicado durante as fases de perfilhamento e de enchimento...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Trigo; Estresse hídrico; Radiação; Índice de colheita.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000300012

Sward structural characteristics and herbage accumulation of Panicum maximum cv. Mombaça subjected to rotational stocking managements
Provedor de dados: 63
Autores: Silva,Sila Carneiro da; Bueno,Adriana Amaral de Oliveira; Carnevalli,Roberta Aparecida; Uebele,Marina Castro; Bueno,Fernando Oliveira; Hodgson,John; Matthew,Cory; Arnold,Greg C.; Morais,Jozivaldo Prudêncio Gomes de.
Grazing strategies promote changes in sward structure that can affect patterns of herbage accumulation and sward flexibility to management. This experiment evaluated sward structural characteristics and herbage accumulation of Mombaça guinea grass (Panicum maximum Jacq. cv. Mombaça) subjected to rotational stocking managements. Treatments involved grazing when swards reached either 95 or 100% interception of the incident light (LI), to post-grazing heights of 30 and 50 cm, and were allocated to 2,000 m² paddocks according to a randomised complete block design in a 2 × 2 factorial arrangement with four replications, from January 2001 to February 2002. Sward canopy changed from a vertical to a more horizontal orientation as the light interception area index...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Grazing management; Leaf canopy height; Leaf area index; Light interception.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000100002

Physical and chemical changes during ripening of blackberry fruits
Provedor de dados: 63
Autores: Tosun,Ilkay; Ustun,N. Sule; Tekguler,Belkis.
Blackberry (Rubus L.) is a naturally growing fruit in Anatolia. Consumption of fresh and frozen blackberries has increased in the past few years in Turkey. The aim of this study is to analyze blackberry at three levels of ripeness taking into account some physical and chemical properties (color, dry matter, soluble solids, total sugar, titratable acidity, pH, total phenolics, total anthocyanin, and minerals) in order to understand this behavior during the ripening process. Blackberry fruits were harvested at green, red and ripe (mature) stages. The determination of fruit maturity was based on fruit surface color. The dry matter, total phenolics and Hunter L, b values decreased but soluble solids, total sugar and total anthocyanins increased with maturity....
Palavras-chave: Rubus L.; Color; Anthocyanin; Mineral matter.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000100012

Structure of genetic diversity of Bemisia tabaci (Genn.) (Hemiptera: Aleyrodidae) populations in Brazilian crops and locations
Provedor de dados: 63
Autores: Fontes,Fernanda von Hertwig Mascarenhas; Colombo,Carlos Augusto; Lourenção,André Luiz.
Bemisia tabaci (Genn.) represents a complex of cryptic species that causes losses of many valuable crops. Even though there are differences in their ability to colonize hosts, transmit phytovirus and develop resistance to insecticides, the genetic differentiation of the insect populations is important for the adoption of control measures. Therefore, the genetic diversity of B. tabaci populations in economically important crops in Brazilian locations was characterized through a microsatellite analysis. Eight microsatellite markers were used for the analysis of eight populations, three in Solanum tuberosum (States of São Paulo, Minas Gerais and Bahia), two in Glycine max (States of São Paulo and Mato Grosso), one in Phaseolus vulgaris and Brassica oleracea...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: SSR; Biotype B; Population genetics; Silverleaf whitefly.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162012000100007

Cultura de apices caulinares de Musa sp. var. Maçã: estabelecimento, micropropagação e enraizamento in vitro
Provedor de dados: 63
Autores: Domingues,E.T.; Tulmann Neto,A.; Mendes,B.M.J.
Através de vários experimentos objetivou-se estudar as melhores respostas da variedade de banana " Maçã" às técnicas de cultura de tecidos no que se refere ao tipo e dimensões dos explantes e ao meio de cultura para obtenção de uma maior taxa de multiplicação in vitro. Os ápices caulinares utilizados como explantes foram obtidos em cinco diferentes maneiras. Observou-se que os ápices caulinares com 0,7 cm de diâmetro basal por 1 cm de comprimento, dos quais foram retiradas as bainhas foliares, apresentaram maior número de brotos. O meio liquido com agitação foi o em que se observou um maior estímulo na brotação, superando o meio semi-sólido e o meio liquido sem agitação. A concentração de BAP testada que permitiu a obtenção de um maior número de brotos foi...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bananeira; Ápices caulinares; Micropropagação; Enraizamento.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000200030

Traffic soil compaction of an oxisol related to soybean development and yield
Provedor de dados: 63
Autores: Beutler,Amauri Nelson; Centurion,José Frederico; Centurion,Maria Aparecida Pessoa da Cruz; Freddi,Onã da Silva; Sousa Neto,Eurico Lucas de; Leonel,Cristian Luarte; Silva,Álvaro Pires da.
Excessive traffic on the soil may affect soybean development. This research was carried out to evaluate soybean root development and grain yield under compacted soil, in an Oxisol. The following traffic treatments were used: T0 = no traffic; T1* = 1 passage of a 4 t tractor; and, T1, T2, T4 and T6, respectively for 1, 2, 4 and 6 passages of an 11 t tractor on the same location, each besides the other. After compaction, soybean [Glycine max cv. MG/BR 46 (Conquista)] was cultivated. The experiment was arranged in a completely randomized design, with six compaction levels and four replicates (plots of 9.0 m²). Undisturbed soil samples were collected in the layers 0.03-0.06, 0.08-0.11, 0.15-0.18 and 0.22-0.25 m, for physical analyses. Root analyses were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycine max; Machine traffic; Bulk density; Penetration resistance.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000600008

Improving detection of dairy cow estrus using fuzzy logic
Provedor de dados: 63
Autores: Brunassi,Leandro dos Anjos; Moura,Daniella Jorge de; Nääs,Irenilza de Alencar; Vale,Marcos Martinez do; Souza,Silvia Regina Lucas de; Lima,Karla Andrea Oliveira de; Carvalho,Thayla Morandi Ridolfi de; Bueno,Leda Gobbo de Freitas.
Production losses due to lack of precision in detecting estrus in dairy cows are well known and reported in milk production countries. Nowadays automatic estrus detection has become possible as a result of technical progress in continuously monitoring dairy cows using fuzzy pertinence functions. Dairy cow estrus is usually visually detected; however, solely use of visual detection is considered inefficient. Many studies have been carried out to develop an effective model to interpret the occurrence of estrus and detect estrus; however, most models present too many false-positive alerts and because of this they are sometimes considered unreliable. The objective of this research was to construct a system based on fuzzy inference functions evaluated with a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Estrus cycle; Artificial intelligence; Expert system.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000500002

Dupla destilação da aguardente de cana: teores de acidez total e de cobre
Provedor de dados: 63
Autores: Bizelli,Leandro César; Ribeiro,Carlos Alberto França; Novaes,Fernando Valadares.
Este trabalho foi desenvolvido com o objetivo de avaliar a influência da condução da destilação sobre os teores de acidez e de cobre da aguardente de cana. Duas técnicas de destilação em alambiques simples foram confrontadas, a destilação convencional (Tratamento A.M.) e a dupla destilação (Tratamento A.B.). Houve influência positiva da dupla destilação sobre as características físico-químicas da aguardente, com redução nos teores de cobre e acidez acética, dentre outros parâmetros tecnológicos analisados.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aguardente de cana; Acidez; Cobre; Destilação.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000400005

Root extracts of Bracchiaria humidicola andSaccharum spontaneum to increase N use by sugarcane
Provedor de dados: 63
Autores: Kölln,Oriel Tiago; Franco,Henrique Coutinho Junqueira; Ferreira,Danilo Alves; Vargas,Vitor Paulo; Castro,Saulo Augusto de Quassi; Cantarella,Heitor; Caldana,Camila; Trivelin,Paulo Cesar Ocheuze.
ABSTRACT Retaining the mineral N in the form of NH4+ in the soil for a lengthy period is desirable for reducing losses. Furthermore, there is evidence that sugarcane prefers NH4+-N in place of NO3−-N. This study aimed firstly, to evaluate the potential of root extracts of Bracchiaria humidicola andSaccharum spontaneum, in contrast with the DCD (Dicyandiamide) inhibitor, to increase absorption of N by plants fertilized with ammonium sulfate, and secondly, to quantify the emission of N2O fluxes with the use of this inhibitor. The experiment was developed in a glasshouse in an entirely randomized design where four treatments were applied: AS) ammonium sulfate (control); AS+DCD) ammonium sulfate associated with dicyandiamide; AS+BCH) ammonium sulfate...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ammonium; Nitrate; Dicyandiamide; Nitrification; Nitrous oxide.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000100034

A utilização de alumino-silicatos como agentes protetores contra a aflatoxicose na alimentação de frangos de corte
Provedor de dados: 63
Autores: Morais,S.A.; Silva,R.D.M.; Domingues,M.A.C.; Fonseca,H.
O experimento foi conduzido para testar a eficiência de dois alumino-silicatos, no controle da aflatoxicose em frangos de corte (machos). Foram efetuadas análises de sangue para verificação da influência da aflatoxina no perfil sanguíneo das aves. Os resultados mostraram efeito negativo (P&lt;0,05) da aflatoxina no desempenho das aves no que se refere ao peso corporal, ganho de peso, consumo e conversão alimentares, quando comparados com o controle. Os níveis sanguíneos de proteína total se apresentaram reduzidos (P&lt;0,05) e os da transaminase glutâmica oxalacética aumentados (P&lt;0,05) em relação ao controle. Os níveis da fosfatase alcalina, tempo de protrombina, gama-ghitamil transferase, bilirrubina e da capacidade total de ligação do ferro não...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aflatoxina; Alumino-silicatos; Frangos de corte; Parámetros sanguíneos.
Ano: 1993
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161993000200020

Two approaches to calculate TVDI in humid subtropical climate of southern Brazil
Provedor de dados: 63
Autores: Schirmbeck,Lucimara Wolfarth; Fontana,Denise Cybis; Schirmbeck,Juliano.
ABSTRACT: Soybean crops occupy most areas in Rio Grande do Sul State and are highly dependent on rainfall since most of them are non-irrigated. Rainfall during the harvest period is often insufficient to meet the water demand, making water indicators an important tool for the crops. This study compared two approaches in the parameterization process of TVDI (Temperature-Vegetation Dryness Index) in a subtropical climate region of Brazil. The process used Moderate Resolution Imaging Spectroradiometer (MODIS) images of the surface temperature (TS) and Normalized Difference Vegetation Index (NDVI), with spatial resolutions of 1,000 m and periods of 8-16 d, respectively. The evaporative triangles for the TS/NDVI scatter plots were built either for each image...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Parameterization; Soybean; Water status; Satellite imagery.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162018000200111

Substitution of rumen degradable nitrogen with urea in sheep fed low quality Eragrostis curvula hay
Provedor de dados: 63
Autores: Mynhardt,Herman; Niekerk,Willem Adriaan Van; Erasmus,Lourens Johannes; Hassen,Abubeker; Coertze,Roelf Johannes.
ABSTRACT The aim of the present study was to determine whether sunflower meal (SFM), a highly rumen degradable protein (RDP) source, can be substituted with non-protein nitrogen (NPN, urea) without impacting negatively on intake, digestibility, rumen fermentation and microbial nitrogen (N) synthesis (MNS) in wethers consuming low quality Eragrostis curvula hay. Five wethers were fed ad libitum, low quality hay and supplemented twice-daily in equal proportions, via the rumen cannulae, one of five iso-nitrogenous and iso-energetic supplements in a 5 × 5 Latin square design experiment. The supplements differed in the ratios of rumen degradable N (RDN) supplied by either SFM and/or urea and is presented as percentage of RDN supplied by urea: T0 (100 % SFM, 0 %...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Low quality roughage; Rumen ammonia; Microbial synthesis.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000600498

Crossbreeding locally adapted hair sheep to improve productivity and meat quality
Provedor de dados: 63
Autores: Issakowicz,Juliano; Issakowicz,Ana Claudia Koki Sampaio; Bueno,Mauro Sartori; Costa,Ricardo Lopes Dias da; Geraldo,Andre Torres; Abdalla,Adibe Luiz; McManus,Concepta; Louvandini,Helder.
ABSTRACT: The use of lambs from crossing of local with specialized sheep breeds for meat production may lead to higher meat deposition and a smaller fat amount in the carcass, with a more adequate nutritional profile for human consumption. This study investigated the performance, carcass and meat characteristics of lambs from the Morada Nova and Santa Inês locally adapted hair breeds and crosses between Dorper × Morada Nova and Dorper × Santa Inês slaughtered at approximately 35 kg. Morada Nova lambs showed lower (p &lt; 0.05) performance compared to the other genetic groups resulting in a higher age at slaughter (p &lt; 0.05). Crossbred Dorper × Santa Inês and Dorper × Morada Nova lambs showed better characteristics for meat production with better (p &lt;...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Locally adapted Brazilian breeds; Breeding; Fatty acid profile; Quality meat; Terminal sire breeds.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162018000400288

CARACTERIZAÇÃO MORFOLÓGICA DE TANGERINAS DE BANCO ATIVO DE GERMOPLASMA DE CITROS DO CENTRO DE CITRICULTURA SYLVIO MOREIRA/IAC
Provedor de dados: 63
Autores: Domingues,Edson Tobias; Souza,Vinícius Castro; Sakuragui,Cássia Mônica; Pompeu Júnior,Jorgino; Pio,Rose Mary; Teófilo Sobrinho,Joaquim; Souza,Juliana P.
O número de variedades de tangerinas utilizadas economicamente é muito restrito, apesar da importância comercial deste grupo de citros. O Banco Ativo de Germoplasma de Citros do Centro de Citricultura Sylvio Moreira/IAC possui em torno de 383 acessos de tangerineiras e híbridos, os quais têm sido estudados sob o ponto de vista botânico, genético e agronômico. Este trabalho visa descrever por meio de 38 caracteres morfológicos, os frutos das tangerineiras Satsuma Unshiu Wase, Clementina, Mel, Portuguesa, Natsu Mikan, Dancy, Cascalho, Campeona, Mexerica-do-Pará e Mexerica-do-Rio. Foram coletados 30 frutos maduros de cada acesso, sendo 10 frutos por planta, num total de 3 plantas por acesso. As tangerineiras, enxertadas sobre tangerineira Cleópatra e...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Citrus; Tangerinas; Análise de agrupamentos; Banco de germoplasma; Melhoramento.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000100027

Convection regime between canopy and air in a greenhouse
Provedor de dados: 63
Autores: Atarassi,Roberto Terumi; Folegatti,Marcos Vinicius; Brasil,René Porfírio Camponez do.
The use of covering materials in protected environments modifies the air movement close to the crop canopy compared to external environment, which changes the heat and mass transfer between canopy and air. Several researches have been made in greenhouses to estimate mass and heat flux using dimensionless numbers to characterize the type of convection (forced, free or mixed). The knowledge of which one is dominant allows simplifications and specific approaches. The dominant convection regime between canopy and air was determined in a naturally ventilated greenhouse cropped with sweet pepper. Forced convection was predominant, representing more than 70% of the time. During daytime, an increase of mixed convection was observed. It is thus appropriated the use...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Heat flux; Leaf; Aerodynamic resistance.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000100012

Liming and Ionic speciation of an Oxisol under no-till system
Provedor de dados: 63
Autores: Zambrosi,Fernando Cesar Bachiega; Alleoni,Luís Reynaldo Ferracciú; Caires,Eduardo Fávero.
The chemical speciation of the soil solution is an important tool for evaluating nutrient availability and aluminum phytotoxicity. The effect of liming in the composition of the soil solution under the no-till (NT) system is still not well known. We evaluated the chemical speciation of Al and nutrients in the soil solution (water extract 1:1), five years after liming at the moment of the establishment of NT in a native pasture, in Ponta Grossa, Paraná State, Brazil. Dolomitic lime was applied at a rate of 4.5 t ha-1 (either incorporated or surface-applied), or split in three annual rates of 1.5 t ha-1. Soil samples from a dystrophic clayey Rhodic Hapludox were collected at the 0 - 0.05; 0.05 - 0.1; 0.1 - 0.2; 0.2 - 0.4; 0.4 - 0.6; and 0.6 - 0.8 m layers,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dolomitic lime; Complex; Ionic pair; Dissolved organic carbon.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000200013

DESENVOLVIMENTO DE MUDAS DE QUIABEIRO [Abelmoschus esculentus (L.) Moench] EM DIFERENTES TIPOS DE BANDEJA E SUBSTRATO
Provedor de dados: 63
Autores: Modolo,Valéria Aparecida; Tessarioli Neto,João.
Devido as vantagens que o sistema apresenta, a produção de mudas utilizando bandejas de isopor, cada vez mais vem sendo utilizada no estado de São Paulo. O sistema proporciona maior cuidado na fase de germinação e emergência, fazendo com que, muitas vezes, uma semente origine uma planta, além de proporcionar menor custo no controle de pragas e doenças e alto índice de pegamento após o transplante. Com o objetivo de avaliar o desenvolvimento de mudas de quiabeiro, cultivar Santa Cruz - 47, produzidas no sistema de bandejas de isopor, montou-se um experimento, em ambiente protegido. Foram comparados três tipos de bandeja, que diferiam entre si pelo volume a altura das células, associadas a quatro diferentes substratos. Os substratos constaram de variações de...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Quiabo; Abelmoschus esculentus; Propagação; Bandeja.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000200017

Nitrogen mineralization in soils amended with sunnhemp, velvet bean and common bean residues
Provedor de dados: 63
Autores: Ambrosano,Edmilson José; Trivelin,Paulo Cesar Ocheuze; Cantarella,Heitor; Ambrosano,Gláucia Maria Bovi; Muraoka,Takashi.
Nitrogen (15N) released from sunnhemp (Crotalaria juncea), velvet bean (Mucuna aterrima) and from Phaseolus bean residues was evaluated after incubation of the plant material in an Eutrudox and a Paleudalf, in a greenhouse experiment with pots containing 6 kg of air dried soil. Dry matter equivalent to 13 Mg ha-1 of Phaseolus bean residues and the same amount of above ground parts of the leguminous species, associated to 2.7 and 2.2 Mg ha-1 of roots of sunnhemp and velvet bean respectively, were incorporated into the soil. A completely randomized experimental design was adopted, with treatments arranged in a 2 &lt;FONT FACE=Symbol&gt;´&lt;/FONT&gt; 3 + 1 factorial, replicated three times. The treatments were the following: two soils (Eutrudox and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mineral nitrogen; Green manure; Nitrogen-15; N-mineralization.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000100020

Microstructural strength of four subtropical soils evaluated by rheometry: properties, difficulties and opportunities
Provedor de dados: 63
Autores: Pértile,Patricia; Holthusen,Dörthe; Gubiani,Paulo Ivonir; Reichert,José Miguel.
ABSTRACT: The structural strength of soils has been extensively described by physical and mechanical properties evaluated on the mesoscale for different soils and management conditions. However, changes in the organization of the soil matrix at the microstructural level, which can be obtained by rheometry, are still seldom used in soil mechanics. Our aim was to use the amplitude sweep test, a rheometry technique, to investigate the microstructural strength of four subtropical soils (two Oxisols, an Ultisol and a Vertisol) and to discuss difficulties with respect to the samples, water content, soil density and vertical force. The various rheological properties which reveal the soil microstructural strength were determined: deformation at the end of the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil mechanics; Oscillatory shear; Amplitude sweep test; Soil structure.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162018000200154

Salt stress induced damages on the photosynthesis of physic nut young plants
Provedor de dados: 63
Autores: Silva,Evandro Nascimento da; Ribeiro,Rafael Vasconcelos; Ferreira-Silva,Sérgio Luiz; Viégas,Ricardo Almeida; Silveira,Joaquim Albenisio Gomes.
Salinity is a major limiting factor to crop productivity in the world especially in semiarid regions. The aim of this study was to evaluate the photosynthetic resistance of Jatropha curcas (L.) young plants subjected to salt stress. The experiment was carried out in a completely randomized design with treatments in a 2 x 3 factorial: two NaCl levels (0 and 100 mmol L-1) and three harvest times: 7 and 14 days of salt exposure and three days of recovery. Leaf Na+ and Cl-concentrations and the K+/Na+ ratios, after seven days of salt exposure, did not reach ionic toxic levels, suggesting that the NaCl-induced osmotic effects prevailed over the ionic ones. Under this condition, the salt stress caused reduction in leaf gas exchange parameters, such as CO2...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Jatropha curcas; Chlorophyll fluorescence; Gas exchange; Ionic toxicity; Salinity.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000100010

Data mining as a hatchery process evaluation tool
Provedor de dados: 63
Autores: Klein,Daniela Regina; Vale,Marcos Martinez do; Silva,Mariana Fernandes Ribas da; Kuhn,Micheli Faccin; Branco,Tatiane; Santos,Mauricio Portella dos.
ABSTRACT The hatchery is one of the most important segments of the poultry chain, and generates an abundance of data, which, when analyzed, allow for identifying critical points of the process . The aim of this study was to evaluate the applicability of the data mining technique to databases of egg incubation of broiler breeders and laying hen breeders. The study uses a database recording egg incubation from broiler breeders housed in pens with shavings used for litters in natural mating, as well as laying hen breeders housed in cages using an artificial insemination mating system. The data mining technique (DM) was applied to analyses in a classification task, using the type of breeder and house system for delineating classes. The database was analyzed in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Attribute selection; Classification tree; Data management; Data mining and information technology.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000400501

Plant densities and modulation of symbiotic nitrogen fixation in soybean
Provedor de dados: 63
Autores: Luca,Marcos Javier de; Hungría,Mariangela.
Soybean nitrogen (N) demands can be supplied to a large extent via biological nitrogen fixation, but the mechanisms of source/sink regulating photosynthesis/nitrogen fixation in high yielding cultivars and current crop management arrangements need to be investigated. We investigated the modulation of symbiotic nitrogen fixation in soybean [Glycine max (L.) Merrill] at different plant densities. A field trial was performed in southern Brazil with six treatments, including non-inoculated controls without and with N-fertilizer, both at a density of 320,000 plants ha−1, and plants inoculated with Bradyrhizobium elkanii at four densities, ranging from 40,000 to 320,000 plants ha−1. Differences in nodulation, biomass production, N accumulation and partition were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycine max; Biological nitrogen fixation; Photosynthesis; Source/sink manipulation; Plant density.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162014000300002

Impact of frozen temperature and thawing methods on the Brazilian sensory profile of Nellore beef
Provedor de dados: 63
Autores: Gomes,Carolina Lugnani; Silva,Thaís Jordânia; Pflanzer,Sérgio Bertelli; Bolini,Helena Maria Andre.
ABSTRACT: We evaluated the effect of frozen storage temperature and thawing methods on acceptance and sensory profile of steaks of Nellore beef strip loin under 30 days of frozen storage. Fresh strip loin (n = 13), collected two days after slaughter, were aged (2 °C) for 14 days and cut into seven steaks subjected to one of the treatments: control (unfrozen), combination of two freezing temperatures (−10 and −20 °C), and three thawing methods (microwave, ambient temperature, and refrigeration thawing). Steaks in the frozen/thawing treatment were frozen using an ultra-fast freezer until the desirable temperature was reached and were stored for 30 days. After cooking, steaks were analyzed by 11 panelists for the Quantitative Descriptive Analysis (QDA®) and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Strip loin steaks; Quantitative descriptive analysis; Acceptance test; Freezing temperature.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000600901

INFLUÊNCIA DA ADIÇÃO DE PALHA DE CANA-DE-AÇÚCAR NA DEGRADAÇÃO DE  14C-AMETRINA EM SOLO AREIA QUARTZOSA
Provedor de dados: 63
Autores: COSTA,M.A.; MONTEIRO,R.T.R.; TORNISIELO,V.L.
A degradabilidade do herbicida ametrina foi determinada em solo Areia Quartzosa com e sem adição de folhas secas de cana-de-açúcar, cultivada em campo, tratada ou não tratada com herbicida ametrina e em solo esterilizado. Amostras de 10g de solo com umidade ajustada à 70% da capacidade de campo e tratadas com 1ml de 14C-ametrina, na concentração de 8mg/ml e atividade específica de 800Bq/mg, foram distribuídas em frascos com tampa e incubadas em ambiente escuro, a 23oC, por 63 dias. Comparando a mineralização da ametrina em solo sem adição e com adição de folhas de cana-de-açúcar tratada ou não tratadas, observou-se 12 a 13 vezes mais 14CO2 desprendido em solos com a adição de palha. Nestes tratamentos foi observado, após 63 dias de incubação, maior número...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Degradação; Ametrina; Cana-de-açúcar; Herbicida; Solo areia quartzoa.
Ano: 1997
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161997000200001

Extratores para Cd, Cu, Cr, Mn, Ni, Pb e Zn em LATOSSOLOS tratados com biossólido e cultivados com milho
Provedor de dados: 63
Autores: Anjos,Ana Rosa Martins dos; Mattiazzo,Maria Emília.
O uso de biossólidos (lodo de esgoto) em áreas agrícolas cria uma demanda por informações sobre o extrator mais adequado para se prever disponibilidade de metais pesados, presentes nesse resíduo, para as espécies vegetais cultivadas nessas áreas. A eficiência dos extratores HCl 0,1 mol L-1, Mehlich 3 e DTPA 0,005 mol L-1 pH 7,3 e da água régia na previsão da fitodisponibilidade de metais pesados presentes em solos tratados com biossólido foi avaliada através de um experimento com milho cultivado em LATOSSOLO VERMELHO Distrófico (LVd) e LATOSSOLO AMARELO Distrófico (LAd). As parcelas experimentais foram vasos com capacidade para 0,5 m³de terra, distribuídos em blocos ao acaso, em esquema fatorial 4 x 4, quatro tratamentos (LVd+lodo, LVd, LAd+lodo e LAd) e...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays; Lodo de esgoto; Metal pesado; Extratores químicos.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000200017

Receptor-Like Kinase (RLK) as a candidate gene conferring resistance to Hemileia vastatrix in coffee
Provedor de dados: 63
Autores: Almeida,Dênia Pires de; Castro,Isabel Samila Lima; Mendes,Tiago Antônio de Oliveira; Alves,Danúbia Rodrigues; Barka,Geleta Dugassa; Barreiros,Pedro Ricardo Rossi Marques; Zambolim,Laércio; Sakiyama,Ney Sussumu; Caixeta,Eveline Teixeira.
ABSTRACT: The biotrophic fungus Hemileia vastatrix causes coffee leaf rust (CLR), one of the most devastating diseases in Coffea arabica . Coffee, like other plants, has developed effective mechanisms to recognize and respond to infections caused by pathogens. Plant resistance gene analogs (RGAs) have been identified in certain plants as candidates for resistance ( R ) genes or membrane receptors that activate the R genes. The RGAs identified in different plants possess conserved domains that play specific roles in the fight against pathogens. Despite the importance of RGAs, in coffee plants these genes and other molecular mechanisms of disease resistance are still unknown. This study aimed to sequence and characterize candidate genes from coffee plants...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coffea arabica; Coffee leaf rust; Resistance gene analogs; Molecular markers; Plant breeding.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000601101

Hydro-physical characterization of soils under tropical semi-deciduous forest
Provedor de dados: 63
Autores: Cooper,Miguel; Rosa,Jaqueline Dalla; Medeiros,João Carlos; Oliveira,Thalita Campos de; Toma,Raul Shiso; Juhász,Carlos Eduardo Pinto.
The study of the hydro-physical behavior in soils using toposequences is of great importance for better understanding the soil, water and vegetation relationships. This study aims to assess the hydro-physical and morphological characterization of soil from a toposequence in Galia, state of São Paulo, Brazil). The plot covers an area of 10.24 ha (320 × 320 m), located in a semi-deciduous seasonal forest. Based on ultra-detailed soil and topographic maps of the area, a representative transect from the soil in the plot was chosen. Five profiles were opened for the morphological description of the soil horizons, and hydro-physical and micromorphological analyses were performed to characterize the soil. Arenic Haplustult, Arenic Haplustalf and Aquertic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ultisol; Alfisol; Water retention; Soil functioning; Image analysis.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162012000200011

Heavy metals in a degraded soil treated with sludge from water treatment plant
Provedor de dados: 63
Autores: Teixeira,Sandra Tereza; Melo,Wanderley José de; Silva,Érica Tomé.
The application of water treatment sludge (WTS) to degraded soil is an alternative for both residue disposal and degraded soil reclaim. This study evaluated effects of the application of water treatment sludge to a Typic Hapludox soil degraded by tin mining in the National Forest of Jamari, State of Rondonia, Brazil, on the content of heavy metals. A completely randomized experimental design with five treatments was used: control (n = 4); chemical control, which received only liming (n = 4); and rates D100, D150 and D200, which corresponded to 100, 150 and 200 mg of N-sludge kg-1 soil (n = 20), respectively. Thirty days after liming, period in which soil moisture was kept at 70% of the retention capacity, soil samples were taken and analyzed for total and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil reclaim; Tin mining; Mehlich 1; Environmental pollution.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000500016

UTILIZAÇÃO DA ANÁLISE DISCRIMINANTE EM ESTUDOS TAXONÔMICOS DE MOSCAS-DAS-FRUTAS DO GÊNERO Anastrepha Schiner, 1868 (DIPTERA: TEPHRITIDAE)
Provedor de dados: 63
Autores: ARAUJO,E.L.; ZUCCHI,R.A.
As moscas-das-frutas Anastrepha fraterculus (Wiedemann, 1830), A. obliqua (Macquart, 1835), A. sororcula (Zucchi, 1979) e A. zenildae (Zucchi, 1979) foram submetidas a uma análise discriminante. Essas espécies do grupo fraterculus distinguem-se unicamente com base em detalhes do ápice do acúleo, que por serem muito semelhantes, dificultam a identificação específica. A análise discriminante permitiu a separação das quatro espécies de Anastrepha, com base em oito medidas do acúleo. Portanto, essa é mais uma técnica para auxiliar as identificações de espécies de Anastrepha, como já acontece em muitos outros grupos de insetos.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Insecta; Análise morfométrica; Taxonomia.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000100017

Energia livre da reação de adsorção de cobre em latossolos ácricos
Provedor de dados: 63
Autores: Silveira,Maria Lucia Azevedo; Alleoni,Luís Reynaldo Ferracciú; Casagrande,José Carlos; Camargo,Otávio Antônio.
Estudou-se a energia livre da reação de adsorção de cobre em amostras superficiais (0-0,2 m) e subsuperficiais (na maior expressão do horizonte B) de três solos paulistas : Latossolo Roxo ácrico (LR), Latossolo variação Una ácrico (LU) e Terra Roxa Estruturada (TE), após a adição de 5, 20, 50, 100, 200, 300, 400 e 600 mg L-1 de cobre. A adsorção de cobre pelos solos foi considerada espontânea, pois a energia livre apresentou valores negativos em todas as concentrações estudadas. Os valores de energia livre diminuíram com o aumento da dose de cobre adicionada. A TE apresentou maior energia livre de adsorção em relação aos Latossolos, sobretudo em superfície. Considerando-se o mesmo solo, os horizontes superficiais apresentaram maior energia livre para as...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Latossolo ácrico; Cobre; Adsorção; Energia livre.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000500013

Genetic progress after cycles of upland rice recurrent selection
Provedor de dados: 63
Autores: Morais Júnior,Odilon Peixoto de; Melo,Patrícia Guimarães Santos; Morais,Orlando Peixoto de; Castro,Adriano Pereira de; Breseghello,Flávio; Utumi,Marley Marico; Pereira,José Almeida; Wruck,Flávio Jesus; Colombari Filho,José Manoel.
Periodic assessment of the genetic progress made in recurrent selection programs is essential for assessing the evolution of the programs and identifying the main factors that have contributed to this progress. This study aimed to estimate genetic progress in grain yield, plant height and days-to-flowering achieved in the CNA6 population of upland rice (Oryza sativa L.), after four cycles of recurrent selection; and evaluate the genetic potential of this population to generate superior inbred lines after each selection cycle. The experimental data were obtained from progeny yield trials of each recurrent selection cycle. These trials were carried out in two or three locations per cycle, and consisted of S0:2 progenies and at least three checks. Federer’s...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: BLUE; BLUP; Mixed model; Population breeding.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162015000400297

Efeito da adição de diferentes fontes de cálcio no movimento de cátions em colunas de solo
Provedor de dados: 63
Autores: Maria,I.C. de; Rossetto,R.; Ambrosano,EJ.; Castro,O.M. de; Neptune,A.M.L.
No estudo realizado em colunas de solo montadas em laboratório, procurou-se avaliar o movimento do cálcio, e de outros cátions, após aplicação de calcário agrícola, gesso, calcário calcinado e uma mistura de calcário agrícola e gesso, comparados com um tratamento testemunha, em dois latossolos vermelho escuros de texturas diferentes: média e argilosa. Utilizaram-se colunas de PVC, com 5cm de diâmetro e 45cm de altura, e aplicaram-se em cada coluna 1,8 litros de água, parcelados em quatro vezes. Determinaram-se os cátions trocáveis presentes na água percolada e, no final do experimento, em cinco profundidades de cada solo. Os resultados mostraram que nos tratamentos gesso e calcário mais gesso as quantidades de Ca2+, Mg2+, K+ e Al3+ na solução percolada...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lixiviação; Cálcio; Magnésio; Potássio; Alumínio; Gesso; Calcário.
Ano: 1993
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161993000100013

Indução de mutação visando a redução de altura de planta e resistência às doenças no cultivar de trigo (Triticum aestivum L.) IAC-17
Provedor de dados: 63
Autores: Tulmann Neto,A.; Camargo,C.E.O.; Alves,M.C.; Castro,J.L.; Gallo,P.B.
A redução na altura da planta e obtenção de resistência às doenças foi experimentada através da indução de mutação por raios-gama na variedade de trigo (Triticum aestivum L.) IAC-17. Sementes foram irradiadas com 35 krad e a partir da geração M2 iniciou-se a seleção. Três das linhagens selecionadas foram comparadas com o cultivar original IAC-17, durante três anos, em sete ensaios avançados realizados em vários locais, em condição de sequeiro e irrigação. Os resultados demonstraram a obtenção de um mutante que apresentou redução na altura da planta, tendência de sofrer menos acamamento e maior resistência a oídio (Erysiphe graminis f. sp. tritici). As demais características agronômicas avaliadas, tais como produção de grãos e seus componentes, reação ao...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Raios-gama; Mulantes; Melhoramento de trigo.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000200014

Environmental group identification for upland rice production in central Brazil
Provedor de dados: 63
Autores: Heinemann,Alexandre Bryan; Sentelhas,Paulo Cesar.
Upland rice (Oryza sativa L.) production is basically concentrated in four central Brazilian States, Mato Grosso, Goiás, Rondônia and Tocantins. To reduce the genotype and environment (G × E) interactions, the classification of environment groups was proposed. The goal of this study explores possibilities to adjust the upland rice regional breeding systems to optimally fit to the range of environments they are targeting, based on a historical yield data set of the Brazilian Geographic and Statistics Institute (IBGE, www.ibge.gov.br/home/) from 54 microregions. The specific objectives of this study were: (i) to identify and classify environmental groups in the Brazilian upland rice production area; (ii) to validate these environmental groups using yield...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Environment classification; Breading program; Cluster analysis; Yield.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000500005

Soybean yield in response to application of phosphate rock associated with triple superphosphate
Provedor de dados: 63
Autores: Oliveira Júnior,Adilson de; Prochnow,Luís Ignácio; Klepker,Dirceu.
Soybean (Glycine max L. Merrill) crop started to be planted in the Brazilian Cerrado in the 1970's, and this region currently contributes with 57% of total soybean production in Brazil. Under natural conditions in this region, the soils present chemical limitations such as low pH, low Cation Exchange Capacity, low nutrient availability, and moreover, clayey soils have a high P fixation capacity mainly due to high contents of Fe/Al oxides. Since P is the most limiting nutrient is this region, a study was performed in the state of Maranhão, Brazil, in a Typic Hapludox, with clayey texture and low available P (extracted by resin). Treatments were defined to evaluate soybean response to broadcast Arad phosphate rock (PR) plus banded triple superphosphate (TSP)...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brazil; Glycine max L. Merrill; Oxisols; P source solubility; Phosphorus; Cerrado soils.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000300016

Changes in soil chemical and physical properties in pasture fertilised with liquid swine manure
Provedor de dados: 63
Autores: Scheid,Douglas Leandro; Silva,Rodrigo Ferreira da; Silva,Vanderlei Rodrigues da; Ros,Clovis Orlando Da; Pinto,Marlo Adriano Bison; Gabriel,Márcia; Cherubin,Maurício Roberto.
ABSTRACT: Chemical and physical properties of soil can be altered with the successive application of liquid swine manure (LSM), also known as slurry. Therefore, monitoring the impact of LSM is essential to an assessment of the potential agronomic and environmental benefits and risks associated with management practices. The aim of this study was to evaluate the effects of LSM on the chemical and physical attributes of soil under pasture (Cynodon spp.), located in southern Brazil. Four areas were sampled: three areas cultivated with Cynodon spp. pasture with successive applications of 200 m3 ha–1 y–1 of LSM for three, eight and 15 years; and untreated native forest as a reference. The soil attributes evaluated were: organic carbon (OC), active (pH water)...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Management of organic residues; Organic carbon; Nutrient availability; Soil compaction; Soil chemistry.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000501401

Assessment of inter- and intra-cultivar variations in olive using SSR markers
Provedor de dados: 63
Autores: Ipek,Ahmet; Barut,Erdogan; Gulen,Hatice; Ipek,Meryem.
Olive (Olea europaea L.) production in the world has been made by using many cultivars, and the genetic uniformity of commercial cultivars is important for standard olive oil and table olive production. The genetic variation among and within commonly cultivated olive cultivars in Turkey was analyzed using SSR markers. A total of 135 leaf samples were collected from 11 commonly cultivated olive cultivars from 11 provinces in four geographical regions of Turkey. Seven SSR primer pairs generated 46 SSR markers, and the number of SSR markers per primer pair ranged from 4 (UDO-14) to 9 (GAPU-89) with an average of 6.57. This high level of SSR polymorphism suggests that olive production in Turkey has been made using genetically diverse olive cultivars and this...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Olea europaea L.; Microsatellite; Intra-varietal variation; Synonyms; Simple sequence repeats.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162012000500007

Vegetative and productive aspects of organically grown coffee cultivars under shaded and unshaded systems
Provedor de dados: 63
Autores: Ricci,Marta dos Santos Freire; Rouws,Janaina Ribeiro Costa; Oliveira,Nelson Geraldo de; Rodrigues,Marinete Bezerra.
Although Coffea arabica species has its origin in the African understories, there is great resistance on the part of the Brazilian producers for growing this species under agroforestry systems as they fear that shading reduces production. This study aimed at evaluating some vegetative traits and the productivity of organically grown coffee (Coffea arabica L.) cultivars under shaded and unshaded systems. Twelve treatments consisting of two cultivation systems (shaded and unshaded) and six coffee cultivars were arranged in randomized blocks with four replicates, in a split-plot scheme. Shading was provided by banana (Musa sp.) and coral bean plants (Erythrinaverna). Shading delayed fruit maturation. Late maturation cultivars, such as the Icatu and the Obatã,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coffea arabica L; Organic coffee; Agroforestry system; Productivity.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000400006

Barley seed coating with urease and phosphatase to improve N and P uptake
Provedor de dados: 63
Autores: Mvila,Beaufray Gilaime; Pilar-Izquierdo,María Concepción; Busto,María Dolores; Perez-Mateos,Manuel; Ortega,Natividad.
ABSTRACT: In this work, barley seed coating with urease and phosphatase, free and immobilized in humic acids, was studied as a tool to enhance the use efficiency of N and P by plants. The seeds were encapsulated in gels of Ca-alginate by a method that allows gelation of the polymer, containing enzymes, from the surface of seeds outward. The coating process did not affect seed germination. A pot experiment with the coated seeds was carried out. The seed coating with free enzymes increased soil ammonium-N (NH4+-N) and inorganic P up to 39 and 54 %, respectively, and up to 62 and 64 %, with the immobilized enzymes, in comparison with control pots. Seed coating improved N (47-137 %) and P (29-61 %) uptake by plants. Moreover, a synergistic response in N and P...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil enzymes; Seed encapsulation; Plant nutrients uptake; Humic acids.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000601401

Benefits of superfine grinding method on antioxidant and antifungal characteristic of Brazilian green propolis extract
Provedor de dados: 63
Autores: Augusto-Obara,Thalita Riquelme; Oliveira,Jacqueline de; Gloria,Eduardo Micotti da; Spoto,Marta Helena Fillet; Godoy,Karina; Vieira,Thais Maria Ferreira de Souza; Scheuermann,Erick.
ABSTRACT: Green propolis is found only in Brazil and due to its important biological characteristics, the food industry views it as a rich source of bioactive compounds. However, an extract must be produced for its application, which is difficult considering the rigid characteristics of raw propolis. Superfine grinding, a process capable of reducing particle size, enables the extraction of most bioactive compounds in propolis. This study evaluated the influence of grinding on size characteristics, antioxidant and antifungal properties of Brazilian green propolis for food preservation. The propolis powder was produced through six different types of grinding (different sieves and rpm), and its quality was evaluated by scanning electron microscopy-energy...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Apis mellifera; SEM-EDX; Ultracentrifugal mill; Total phenolic content; Food preservative.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162019001500398

Simulation of soil organic carbon changes in Vertisols under conservation tillage using the RothC model
Provedor de dados: 63
Autores: Molina,Lucila González; Moreno Pérez,Esaú del C.; Pérez,Aurelio Baéz.
ABSTRACT The purpose of this study was to determine the measured and simulated rates of soil organic carbon (SOC) change in Vertisols in short-term experiments when the tillage system is changed from traditional tillage (TT) to conservation tillage (CT). The study was conducted in plots in four locations in the state of Michoacán and two locations in the state of Guanajuato. In the SOC change simulation, the RothC-26.3 carbon model was evaluated with different C inputs to the soil (ET1-ET5). ET was the measured shoot biomass (SB) plus estimated rhizodeposition (RI). RI was tested at values of 10, 15, 18, 36 and 50 % total biomass (TB). The SOC changes were simulated with the best trial where ET3 = SB + (0.18*TB). Values for model efficiency and the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Land use change; Conservation agriculture; Carbon sequester.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162017000300235

Adsorption and desorption of arsenic and its immobilization in soils
Provedor de dados: 63
Autores: Almeida,Cecília Calhau; Fontes,Maurício Paulo Ferreira; Dias,Adriana Cristina; Pereira,Thiago Torres Costa; Ker,João Carlos.
ABSTRACT: Arsenic (As) is a naturally occurring chemical element considered toxic and carcinogenic by health and environmental protection agencies. Studies of As adsorption/desorption behavior in soils are important to predictions of As’ potential mobility in natural systems. The aim of this study was to assess the adsorption of As(V) in soils from Minas Gerais, Brazil, and determine its immobilization rate in order to identify soils with characteristics more favorable to its deployment as an As geochemical barrier. The adsorption experiment was performed using different As concentrations and the data pertaining to the maximum adsorption capacity of As(V) (MACAs) were determined by Langmuir and Freundlich isoterms. The Oxisols, due to their more oxidic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Toxic contaminant; Maximum adsorption capacity; Mineralogy of soils; Texture; Geochemical barrier.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000301401

Breeding new sugarcane clones by mixed models under genotype by environmental interaction
Provedor de dados: 63
Autores: Gonçalves,Gustavo Menezes; Viana,Alexandre Pio; Amaral Junior,Antônio Teixeira do; Resende,Marcos Deon Vilela de.
Sugarcane (Saccharum spp.) is one of the most important crops cultivated in the tropics and subtropics and plays a significant economic and environmental role in Brazil. Twentyfour new clones were evaluated in different locations as potential models for recommendation as new varieties. The mixed model methodology, using the harmonic mean of the relative performance of genetic values (MHPRVG), facilitated the analysis of genotypic stability and adaptability, culminating in the recommendation of clones for each location. MHPRVG ranked clones RB92579, RB867515, SP81-3250, RB947520 and RB931530 as the best five, and, additionally, clones with greater genotypic potential were identified for each test in the six localities.
Tipo: Info:eu-repo/semantics/article
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162014000100009

Phosphorus loss by surface runoff in no-till system under mineral and organic fertilization
Provedor de dados: 63
Autores: Bertol,Oromar João; Rizzi,Nivaldo Eduardo; Favaretto,Nerilde; Lana,Maria do Carmo.
The no-till system has been intensively used in the state of Paraná, Brazil, and it has increased the nutrients level at the soil surface. This has contributed for nutrient losses via runoff and consequently, off-site water pollution. The objective of this study was to evaluate phosphorus loss in surface runoff by simulated rainfall on an Oxisol, under no-till system following application of mineral fertilizer and liquid swine manure. Nitrogen, soil and water losses from the same study are reported in a separated paper. The application of liquid swine manure, compared with mineral fertilization, increased runoff concentration of total P, particulate P and dissolved reactive P by 193%, 111% and 506%, respectively, averaged for all rainfall intensities....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Liquid swine manure; Water quality; Eutrophication; Soil erosion; Conservation tillage.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000100010

Obtaining weather data for input to crop disease-warning systems: leaf wetness duration as a case study
Provedor de dados: 63
Autores: Gleason,Mark L.; Duttweiler,Katrina B.; Batzer,Jean C.; Taylor,S. Elwynn; Sentelhas,Paulo Cesar; Monteiro,José Eduardo Boffino Almeida; Gillespie,Terry J.
Disease-warning systems are decision support tools designed to help growers determine when to apply control measures to suppress crop diseases. Weather data are nearly ubiquitous inputs to warning systems. This contribution reviews ways in which weather data are gathered for use as inputs to disease-warning systems, and the associated logistical challenges. Grower-operated weather monitoring is contrasted with obtaining data from networks of weather stations, and the advantages and disadvantages of measuring vs. estimating weather data are discussed. Special emphasis is given to leaf wetness duration (LWD), not only because LWD data are inputs to many disease-warning systems but also because accurate data are uniquely challenging to obtain. It is concluded...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Integrated pest management; Site-specific weather data; Disease forecasting; Disease prediction; Sustainable agriculture.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000700013

Distribuição do sistema radicular do milho em terra roxa estruturada latossólica: II. Comparação entre cultura irrigada e fertirrigada
Provedor de dados: 63
Autores: Bassoi,L.H.; Fante Júnior,L.; Jorge,L.A.C.; Crestana,S.; Reichardt,K.
A distribuição do sistema radicular do milho irrigado, até 1 m de profundidade, em uma terra roxa estruturada latossólica em Piracicaba, SP, foi analisada aos 126 dias após a emergência das plantas. As raízes expostas pela abertura de trincheiras longitudinalmente às Unhas de plantas foram filmadas e essas imagens digitalizadas e processadas para a contabilização de sua distribuição no perfil do solo, por meio do sistema SIARCS desenvolvido para esse fim. A densidade de raiz de milho a 0-60 cm foi maior para a aplicação de N via solo, enquanto que a 60-100 cm a fertirrigação proporcionou uma maior presença de raízes. Por meio de tensiômetros e da sonda de nêutrons, notou-se, respectivamente, que a maior amplitude de variação do potencial matricial da água...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Distribuição radicular; Milho; Irrigação; Processamento de imagens.
Ano: 1994
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000300028

Arabidopsis thaliana as a model host for Brevipalpus mite-transmitted viruses
Provedor de dados: 63
Autores: Arena,Gabriella Dias; Ramos-González,Pedro Luis; Nunes,Maria Andréia; Jesus,Camila Chabi; Calegario,Renata Faier; Kitajima,Elliot Watanabe; Novelli,Valdenice Moreira; Freitas-Astúa,Juliana.
ABSTRACT: Brevipalpus-transmitted viruses (BTV) are a taxonomically diverse group of plant viruses which severely affect a number of major crops. Members of the group can be sub-classified into cytoplasmic (BTV-C) or nuclear type (BTV-N) according to the accumulation sites of virions in the infected plant cells. Both types of BTV produce only local infections near the point of inoculation by viruliferous mites. Features of BTV-plant interactions such as the failure of systemic spread in their natural hosts are poorly understood. In this study we evaluated Arabidopsis thaliana, a model plant commonly used for the study of plant-virus interactions, as an alternative host for BTV. Infection of Arabidopsis with the BTV-N Coffee ringspot virus and Clerodendrum...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Clerodendrum chlorotic spot virus; Cilevirus; Solanum violaefolium ringspot virus; Coffee ringspot virus; Dichorhavirus.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162017000100085

Análise das curvas do fitotensiômetro de Alvim por regressão linear
Provedor de dados: 63
Autores: CONFORTO,E. de C.; CORNÉLIO,M.L.; CASTRO,P.R. de C. e.
O fitotensiômetro de Alvim é amplamente utilizado para demonstrar a variação da turgescência do tronco, que é reduzida durante o dia, como efeito líquido da transpiração que ocorre na copa, e aumentada durante o período noturno, devido à recuperação que pode ser total ou parcial, dependendo da umidade disponível no solo, e da capacidade da planta em absorvê-la. Os valores indicados no manômetro são relativos, e muitas vezes não coincidem com os previstos pelas taxas de transpiração mensuradas ao longo do dia. Este trabalho considera a necessidade de uma nova interpretação das curvas observadas, através do seu seccionamento em diferentes cinéticas, sendo aplicadas equações de regressão linear a estas diferentes partes, e analisado o coeficiente angular...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fitotensiômetro; Turgescência; Regressão linear; Coeficiente angular.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000300015

CONTROLE DO CUPIM-DE-MONTE Cornitermes cumulans (KOLLAR, 1832) COM FORMULAÇÕES LÍQUIDAS DE CLORPIRIFÓS E ENDOSSULFAN
Provedor de dados: 63
Autores: MARICONI,F.A.M.; PACHECO,P.; CINIGLIO NETO,F.; PASSOS,H.R.; CAMPOS NETO,H.M.
Com o objetivo de controle do cupim-de-monte Cornitermes cumulans, o principal cupim invasor de pastagens naturais no Estado de São Paulo, foi instalado ensaio com 8 tratamentos e 10 repetições: A1 e A2 clorpirifós (600 ml CE 22,4%); B1 e B2 clorpirifós (1000 ml CE 22,4%); C1 e C2 endossulfan (600 ml CE 35%); D1 e D2 endossulfan (1000 ml CE 35%). Entre parêntesis estão as quantidades de produtos comerciais em 100 litros de água (um litro de calda por monte). A formulação à base de clorpirifós foi o "Dursban" e, a de endossulfan, foi o "Thiodan". Em A1, B1, C1 e D1, os montes foram destruídos 120 dias após a aplicação; em A2, B2, C2 e D2, aos 253 dias da aplicação. Não houve diferença significativa entre os tratamentos: todos foram eficientes.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cupim-de-monte; Pastagens naturais; Controle químico.
Ano: 1996
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161996000200017

Solar radiation affects grapevine susceptibility to Plasmopara Viticola
Provedor de dados: 63
Autores: Dalla Marta,Anna; Di Stefano,Valentina; Cerovic,Zoran G.; Agati,Giovanni; Orlandini,Simone.
Solar radiation plays an important role in the development of some fungal diseases due to its direct action on the microorganisms and also its indirect effect on the production of specific plant compounds. This experiment examined the effect of two light environments (100% and 35% of full strength) on the polyphenolic content of grapevine leaves and quantified their relation to resistance to downy mildew (Plasmopara viticola). Leaf epidermal polyphenolic contents were non-destructively measured during the growing season 2006 using the Dualex chlorophyll fluorescence-based portable leaf-clip. The experimental design consisted of six parcels of 30 vines and measurements were performed on the 12 central vines. The leaves were inoculated with a sporangia...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ultra-violet radiation; Photosynthetic active radiation; Polyphenolics; Downy mildew; Resistance.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000700011

Carotenoid extraction using edible vegetable oil: an enriched provitamin A product
Provedor de dados: 63
Autores: Borguini,Renata Galhardo; Pacheco,Sidney; Chávez,Davy William Hidalgo; Couto,Giovana Almeida; Wilhelm,Allan Eduardo; Santiago,Manuela Cristina Pessanha de Araújo; Nascimento,Luzimar da Silva de Mattos do; Jesus,Monalisa Santana Coelho de; Godoy,Ronoel Luiz de Oliveira.
ABSTRACT: Vitamin A deficiency is the third most important micronutrient deficiency having a significant impact on public health worldwide. The aim of this study was to develop a carotenoid extraction process with edible vegetable oils, using a central composite design which, concurrently, enriches the oils with provitamin A carotenoids. The stability of carotenoids in the oil and their shelf life was also evaluated. The process also aimed to meet the Recommended Daily Intake for vitamin A (600 μg retinol equivalent for an adult) with the enriched oil. The results showed that 20 % of the vegetable matrix (dried carrot) in vegetable oil and 5 min of extraction time was an optimum combination for both soy oil (64.43 μg retinol equivalent mL−1) and olive oil...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Retinol; Food-to-food fortification; Oil shelf life; Carotenoid stability; Central composite design.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000500901

Production of interstocked 'Pera' sweet orange nursey trees on 'Volkamer' lemon and 'Swingle' citrumelo rootstocks
Provedor de dados: 63
Autores: Girardi,Eduardo Augusto; Mourão Filho,Francisco de Assis Alves.
Incompatibility among certain citrus scion and rootstock cultivars can be avoided through interstocking. 'Pera' sweet orange (Citrus sinensis L. Osbeck) nursery tree production was evaluated on 'Swingle' citrumelo (Poncirus trifoliata (L.) Raf x Citrus paradisi Macf) and 'Volkamer' lemon (Citrus volkameriana Pasquale) incompatible rootstocks, using 'Valencia' and 'Hamlin' sweet oranges (Citrus sinensis L. Osbeck), 'Sunki' mandarin (Citrus sunki Hort. ex Tanaka), and 'Cleopatra' mandarin (Citrus reshni Hort. ex Tanaka) as interstocks. Citrus nursery trees interstocked with 'Pera' sweet orange on both rootstocks were used as control. 'Swingle' citrumelo led to the highest interstock bud take percentage, the greatest interstock height and rootstock diameter,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Citrus; Incompatibility; Interstock; Propagation.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000100002

Volume application rate adapted to the canopy size in greenhouse tomato crops
Provedor de dados: 63
Autores: Sánchez-Hermosilla,Julián; Páez,Francisco; Rincón,Víctor J.; Pérez-Alonso,José.
The application rate of plant-protection products is indicated as a concentration or amount of product per area. Greenhouse crops grow swiftly, and an application rate based on a fixed amount of product per hectare can result either in large losses and overdoses when the plants are small or to be insufficient when the plants are fully developed. To solve these problems, the application rates of plant-protection products need to be adapted to the plant mass present in the greenhouse when the spray is applied. Two models were developed to estimate the leaf area based on easily measured geometric data of the vegetation in a greenhouse tomato crop. The model based on the PRV (Plant Row Volume) had that best results. The calculation of the volume application...
Tipo: Info:eu-repo/semantics/article
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162013000600003

Uréia em cobertura e via foliar em feijoeiro
Provedor de dados: 63
Autores: Almeida,Claudinei de; Carvalho,Marco Antonio Camillo de; Arf,Orivaldo; Sá,Marco Eustáquio de; Buzetti,Salatiér.
O presente trabalho foi desenvolvido com o objetivo de verificar a influência de diferentes concentrações de uréia (0, 40, 60, 80, 100 e 120 g kg-1) em solução, para fornecimento de N via foliar, em diferentes horários (08h, 16h e 20h), na presença e ausência de adubação nitrogenada em cobertura (via solo). O solo do local do ensaio é do tipo Latossolo Vermelho-Escuro álico. O delineamento experimental seguiu o esquema fatorial 6x3x2, com quatro repetições. A semeadura foi realizada mecanicamente no dia 24.06.1996, utilizando-se o cultivar IAC Carioca, conduzido em regime de irrigação. Aplicaram-se 200 L ha-1 de calda, em cada pulverização com uréia. A adubação nitrogenada em cobertura foi realizada aos 32 dias após a emergência (dae), aplicando-se 40 kg...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phaseolus vulgaris; Feijão; Nitrogênio; Adubação foliar.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000200016

Mixed-effects growth curves in the valuation of Nellore sires
Provedor de dados: 63
Autores: Giolo,Suely Ruiz; Henderson,Robin; Demétrio,Clarice Garcia Borges.
Cattle breeding programmes need objective criteria in order to evaluate and subsequently improve production systems. This work uses a logistic growth curve model for evaluating sires based on their progeny weight measured repeatedly over time. The parameters of the curve are described as a linear function of fixed and random effects. A Bayesian approach is used for the estimation. Analysis of the weights recorded on animals of the Nellore breed shows that growth curve models with fixed and random effects can be useful to evaluate and selecting sires.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Beef cattle; Logistic model; Longitudinal data; Random effects.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000100012

Antifungal compound produced by the cassava endophyte Bacillus pumilus MAIIIM4a
Provedor de dados: 63
Autores: Melo,Flávia Mandolesi Pereira de; Fiore,Marli Fátima; Moraes,Luiz Alberto Beraldo de; Silva-Stenico,Maria Estela; Scramin,Shirlei; Teixeira,Manoel de Araújo; Melo,Itamar Soares de.
In the search for new organisms and new secondary metabolites, a study was conducted to evaluate the diversity of endophytic bacteria from ethnovarieties of cassava cultivated by Brazilian Amazon Indian tribes and also to study the secondary metabolites produced by a Bacillus pumilus strain. Sixty seven cassava endophytic bacteria were subjected to 16S rRNA sequencing and FAME analysis. The bacterial profile revealed that 25% of all endophytic isolates belonged to the genus Bacillus. The isolate B. pumilus MAIIIM4a showed a strong inhibitory activity against the fungi Rhizoctonia solani, Pythium aphanidermatum and Sclerotium rolfsii. Secondary metabolites of this strain were extracted using hexane, dichloromethane and ethyl acetate. Extracts were subjected...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: ESI-MS/MS; Pumilacidin; Endophytic bacteria; Bioautography.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000500002

Enzymatic activity of lipase in post-metamorphic phase bullfrogs
Provedor de dados: 63
Autores: Braga,Luís Gustavo Tavares; Oliveira,Maria Goreti de Almeida; Lima,William Cardoso; Euclydes,Ricardo Frederico.
The knowledge of the digestive system of bullfrogs is an important step for the determination of their nutritional requirements throughout growth phases. With the objective of evaluating the enzymatic activity of lipase in the intestinal content of bullfrogs (Rana catesbeiana Shaw, 1802), 100 animals with median weight of 3.6 g were distributed in stalls under controlled temperature and photoperiod. The frogs, selected at the post-metamorphic phase, received commercial extruded diet ad libitum throughout the 87-day experiment. The collections of the intestinal content were performed by the desensitization of the frogs in ice and water at 0ºC and subsequent isolation of the small intestine. Determination of lipase activity was performed with a commercial...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Digestive enzyme; Frog culture; Specific activity.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000500004

Bioactive peptides from beef products fermented by acid whey – in vitro and in silico study
Provedor de dados: 63
Autores: Kęska,Paulina; Wójciak,Karolina Maria; Stadnik,Joanna.
ABSTRACT: This research investigated the potential of beef products with acid whey to release bioactive peptides and thereby emphasize their health-promoting potential. Peptide sequences were isolated and identified by liquid chromatography-electrospray ionization-mass spectrometry (LC-ESI-MS). Firstly, the antihealth properties (toxicity, allergenicity) of the peptides were estimated based on the peptide sequences. Next, their health-promoting potential was demonstrated based on an in silico analysis by determining their bioactivity scores (PeptideRanker). Their various biological actions were also determined using BIOPEP-UWM tools. We presented peptide sequences with properties relevant to ensuring good health and well-being, including cardiovascular...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biological active peptides; Allergenity; Uncured beef; Healthy meat product.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162019001400311

Reduced arbuscular mycorrhizal colonization in tomato ethylene mutants
Provedor de dados: 63
Autores: Zsögön,Agustin; Lambais,Marcio Rodrigues; Benedito,Vagner Augusto; Figueira,Antonio Vargas de Oliveira; Peres,Lázaro Eustáquio Pereira.
Plant hormones are likely key regulators of arbuscular mycorrhizae (AM) development. However, their roles in AM are not well known. Here mutants in five hormone classes introgressed in a single tomato (Lycopersicon esculentum Mill. Syn Solanum lycopersicum L.) background (cv. Micro-Tom) were used to determine their effects on AM development and the expression of defense-related genes (chitinases and b-1,3-glucanases) in roots. Under low P conditions, mutant epinastic (epi) and Never ripe (Nr), ethylene overproducer and low sensitivity, respectively, had the intraradical colonization by Glomus clarum highly inhibited, as compared to the control Micro-Tom (MT). No significant alterations in fungal colonization were observed in mutants affecting other hormone...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lycopersicon; Micro-Tom; Defense-related genes; Hormones; Phosphate.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000300006

Plant biostimulants: physiological responses induced by protein hydrolyzed-based products and humic substances in plant metabolism
Provedor de dados: 63
Autores: Nardi,Serenella; Pizzeghello,Diego; Schiavon,Michela; Ertani,Andrea.
ABSTRACT In recent years, the use of biostimulants in sustainable agriculture has been growing. Biostimulants can be obtained from different organic materials and include humic substances (HS), complex organic materials, beneficial chemical elements, peptides and amino acids, inorganic salts, seaweed extracts, chitin and chitosan derivatives, antitranspirants, amino acids and other N-containing substances. The application of biostimulants to plants leads to higher content of nutrients in their tissue and positive metabolic changes. For these reasons, the development of new biostimulants has become a focus of scientific interest. Among their different functions, biostimulants influence plant growth and nitrogen metabolism, especially because of their...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hormones; Nitrogen metabolism; Carbon metabolism; Phenylpropanoid pathway; Stress.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000100018

Soil respiration in cucumber field under crop rotation in solar greenhouse
Provedor de dados: 63
Autores: Liang,Yinli; Bai,Caihong; Mu,Lan; Zhou,Maojuan.
Crop residues are the primary source of carbon input in the soil carbon pool. Crop rotation can impact the plant biomass returned to the soil, and influence soil respiration. To study the effect of previous crops on soil respiration in cucumber (Cucumis statirus L.) fields in solar greenhouses, soil respiration, plant height, leaf area and yield were measured during the growing season (from the end of Sept to the beginning of Jun the following year) from 2007 to 2010. The cucumber was grown following fallow (CK), kidney bean (KB), cowpea (CP), maize for green manure (MGM), black bean for green manure (BGM), tomato (TM), bok choy (BC). As compared with CK, KB, CP, MGM and BGM may increase soil respiration, while TM and BC may decrease soil respiration at...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Leaf area; CO2 emission; Plant height; Previous crop; Yield.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162014000400012

AMMI analysis to evaluate the adaptability and phenotypic stability of sugarcane genotypes
Provedor de dados: 63
Autores: Silveira,Luís Cláudio Inácio da; Kist,Volmir; Paula,Thiago Otávio Mendes de; Barbosa,Márcio Henrique Pereira; Peternelli,Luiz Alexandre; Daros,Edelclaiton.
Sugarcane (Saccharum sp.) is one of the most important crops in Brazil. The high demand for sugarcane-derived products has stimulated the expansion of sugarcane cultivation in recent years, exploring different environments. The adaptability and the phenotypic stability of sugarcane genotypes in the Minas Gerais state, Brazil, were evaluated based on the additive main effects and multiplicative interaction (AMMI) method. We evaluated 15 genotypes (13 clones and two checks: RB867515 and RB72454) in nine environments. The average of two cuttings for the variable tons of pol per hectare (TPH) measure was used to discriminate genotypes. Besides the check RB867515 (20.44 t ha-1), the genotype RB987935 showed a high average TPH (20.71 t ha-1), general...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: G × E interaction; Principal components; Multivariate analysis.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162013000100005

Melissopalynology in Brazil: a review of pollen analysis of honeys, propolis and pollen loads of bees
Provedor de dados: 63
Autores: Barth,Ortrud Monika.
This paper reviews current knowledge on the occurrence of several types of pollen grains in the sediments of honey samples, propolis and bee loads of Apiinae and Meliponinae in Brazil. After a short historical introduction about research activities in Melissopalynology using Brazilian samples, bee products were analyzed in respect to the greater Brazilian regions (South, Southeast, Northeast and North), emphasizing monofloral honeys and the green propolis. Numerous bibliographic references and a short glossary of the technical terms used is presented.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Honey pollen; Propolis pollen; Bee load pollen; Analysis; Brazil.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000300018

Boro em solos de várzea do sul de Minas Gerais e a cultura do feijoeiro
Provedor de dados: 63
Autores: Mariano,Eduardo Dol'ava; Faquin,Valdemar; Furtini Neto,Antonio Eduardo; Mariano,Isabela Orlando dos Santos; Oliveira Jr.,Antonio Claret de.
Com o objetivo de avaliar a resposta do feijoeiro (Phaseolus vulgaris L.) à aplicação de B em solos de várzea, conduziu-se um experimento em casa de vegetação com quatro solos (0-20cm), Glei Pouco Húmico (GP), Aluvial (A), Glei Húmico (GH) e Orgânico (O), este último artificialmente drenado, coletados no município de Lavras (MG). O delineamento experimental foi inteiramente casualizado, com quatro repetições, arranjado num esquema fatorial 4x7, consistindo dos 4 solos e de 7 doses de B (0,0; 0,25; 0,5; 1,5; 3,0; 6,0 e 10,0 mg dm-3 de solo). Os solos receberam calcário dolomítico, macro e micronutrientes e as respectivas doses de B, e foram incubados por 24 dias. Antes da semeadura, os solos foram amostrados e analisados para B (água quente). Foram...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phaseolus vulgaris; Feijão; Boro; Solo de várzea.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000500006

Desinfestação de Averrhoa carambola infestada por Anastrepha obliqua (Macquart, 1835) (diptera -Tephritidae) através de radiação gama
Provedor de dados: 63
Autores: Arthur,V.; Wiendl,P.M.
O experimento teve por objetivo determinar a dose de desinfestação para Averrhoa carambola infestada por larvas de Anastrepha obliqua. Para realização do experimento coletou-se frutos do campo e fez-se urna amostragem prévia, constatando-se que cada fruta continha em média 11 larvas de último instar do referido inseto praga. Esses frutos foram irradiados com as seguintes doses de radiação gama: 0 (test.), 50, 150, 300, 600 e 900 Gy. Cada tratamento constou de 3 repetições num total de 9 frutas e aproximadamente 99 larvas por tratamento. Após a irradiação as frutas foram colocadas em câmara climatizada com 25 ± 5°C de temperatura e umidade relativa de 70 ± 5% onde aguardou-se que as larvas deixassem os frutos e se transformassem em pupas e posteriormente em...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Averrhoa carambola; Anastrepha obliqua; Quarentena; Carambola; Mosca-das-frutas; Irradiação.
Ano: 1994
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000200003

Stable carbon and nitrogen isotopic fractionation between diet and swine tissues
Provedor de dados: 63
Autores: Nardoto,Gabriela Bielefeld; Godoy,Patricia Barboza de; Ferraz,Epaminondas Sansigolo de Barros; Ometto,Jean Pierre Henry Balbaud; Martinelli,Luiz Antonio.
Naturally occurring stable isotope ratios can be a powerful tool in studies of animal nutrition, provided that the assumptions required for dietary reconstruction are validated by studies such as the one presented here. The objective of this study was to document the magnitude of isotopic fractionation between swine diet and their different tissues. For this, the isotopic ratios of carbon and nitrogen of the diet and selected tissues (hair, nail, liver, muscle, fat and cartilage) were determined. The delta13C and delta15N of the diet were -15.9‰ and 1.3‰, respectively, and all delta15N of swine tissues were 2.2 to 3.0‰ enriched in 15N in relation to the diet. Little variation in delta15N occurred among tissues, with exception to liver that was less...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Delta13C; Delta15N; Dietary inputs; Domestic pig; Isotope ratios.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000600012

Waterlogging-induced changes in fermentative metabolism in roots and nodules of soybean genotypes
Provedor de dados: 63
Autores: Borella,Junior; Amarante,Luciano do; Oliveira,Denise dos Santos Colares de; Oliveira,Ana Claudia Barneche de; Braga,Eugenia Jacira Bolacel.
Waterlogging blocks the oxygen supply to the root system which inhibits respiration, and greatly reduces the energy status of cells that affect important metabolic processes. This study evaluated fermentative metabolism and carbohydrate contents in the root system of two soybean (Glycine max L. Merril) genotypes under hypoxic and post-hypoxic conditions. Nodulated plants (genotypes Fundacep 53 RR and BRS Macota) were grown in vermiculite and transferred to a hydroponic system at the reproductive stage. The root system was submitted to hypoxia by flowing N2 (nitrogen) gas in a solution for 24 and 72 h. For recovery, plants returned to normoxia condition by transfer to vermiculite for 24 and 72 h. Fermentative enzyme activity, levels of anaerobic metabolites...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycine max; Oxygen deficiency; Enzyme activities; Anaerobic metabolites; Sugars.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162014000600009

DRIS norms for evaluating the nutritional state of apple tree
Provedor de dados: 63
Autores: Nachtigall,Gilmar Ribeiro; Dechen,Antonio Roque.
For Brazilian conditions there are still no studies on the use of the diagnosis and recommendation of the integrated system (DRIS) for nutritional diagnosis of the apple tree. The nutritional diagnosis of the apple tree is made using the criterion of sufficiency range. The aim of this report is to establish DRIS norms to interpret the results of apple tree leaf analysis in South Brazil. The study covered the apple producing areas of the states of Rio Grande do Sul and Santa Catarina, in 70 orchards selected for their high productivity and employment of excellent management techniques. The concentrations of nitrogen, phosphorus, potassium, calcium, magnesium, boron, copper, iron, manganese, and zinc were determined in leaf samples. DRIS indices were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Malus Domestica; DRIS norms; Foliar diagnosis.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000300011

Soil carbon stock and humification in pastures under different levels of intensification in Brazil
Provedor de dados: 63
Autores: Segnini,Aline; Xavier,Alfredo Augusto Pereira; Otaviani-Junior,Pedro Luis; Oliveira,Patrícia Perondi Anchão; Pedroso,André de Faria; Praes,Maria Fernanda Ferreira Menegucci; Rodrigues,Paulo Henrique Mazza; Milori,Débora Marcondes Bastos Pereira.
ABSTRACT: Intensive management of tropical pastures has shown potential for greenhouse gas (GHG) mitigation due to high forage production and C accumulation in the soil. This study aimed to evaluate different pasture management options in relation to their effect on soil C stocks and soil organic matter (SOM) humification. Pastures in four beef cattle production systems were assessed: intensive and irrigated pasture with high stocking rate (IHS); dryland pasture with high stocking rate (DHS); dryland pasture with moderate stocking rate (DMS); degraded pasture (DP). The soil under the native forest was also evaluated and soil carbon stocks from the 0-100 and 0-30 cm layers were assessed. Carbon stocks (0-100 cm) ranged from 99.88 to 142.33 Mg ha−1 in DP and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Atlantic Forest biome; Brazilian livestock systems; Laser-Induced Fluorescence Spectroscopy; Humification index; Organic matter.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162019000100033

Feeding preferences of Microtheca punctigera (Achard) (Coleoptera: Chrysomelidae) for some Brassicaceae plants in multiple-choice assays
Provedor de dados: 63
Autores: Menezes Jr.,Ayres Oliveira; Mikami,Adriana Yatie; Ide,André Keiiti; Ventura,Maurício Ursi.
Host plant feeding preference is important basic information for the development of insect management strategies. Multiple-choice feeding preference assays were conducted in the laboratory for the chrysomelid beetle, Microtheca punctigera (Achard). Feeding was assessed 72 h after onset of experiments. With one larva per Petri dish, food items comprised watercress, Nasturtium officinale L., arugula, Eruca sativa L., mustard, Brassica juncea Cosson, Chinese cabbage, B. pekinensis (Lour.) Rupr. and wild radish (Raphanus raphanistrum L.). Feeding ranking preferences were Chinese cabbage, mustard, wild radish, arugula and watercress (7.97, 1.85, 0.98, 0.36 and 0.11 mm², respectively). Feeding on Chinese cabbage was 4.31 times more intense than on mustard. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brassicaceae; Insecta; Host plants; Consumption.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000100014

Avaliação da monensina sódica em vacas leiteiras
Provedor de dados: 63
Autores: Campos Neto,O.; Ramos,A.A.; Escobar,M.J.; Dalanesi,J.A.; Bem,C.H.W. de.
Utilizaram-se quinze vacas da raça Holandesa, submetidas a três tratamentos: T1-controle, T2-monensina sódica 300 mg/animal/dia, T3-monensina sódica 225 mg/animal/dia. A produção de leite, consumo de ração e o peso dos animais foram mensurados, juntamente com a avaliação da condição corporal Após o período experimental de 112 dias, evidenciou-se aumento na produção de leite de 13,5% e 10% (T2) em relação a TI e T3 respectivamente. Houve redução de consumo de ração de 4,5% (T2) e 3% (T3) em relação ao controle.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Produção de leite; Ionóforo.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000200011

Eradicant and curative treatments of hexanal against peach brown rot
Provedor de dados: 63
Autores: Baggio,Juliana Silveira; Lourenço,Silvia de Afonseca; Amorim,Lilian.
Brown rot, caused by Monilinia spp. , is one of the most important peach (Prunuspersica (L.) Batsch) diseases and the main cause of postharvest losses. Currently, alternative methods for postharvest disease control, such as the use of volatiles, are under investigation. The objective of this study was to determine the effects of hexanal on the in vitro development of Monilinia fructicola and M. laxa and on monocyclic components of brown rot on peaches. To evaluate the effect on pathogen development in vitro, a single dose of 215 µL of liquid hexanal was placed on glass jars in closed plastic containers (4.3 L) at the moment of fungi transfer, 24 or 48 h after transferring to Petri dishes. After hexanal application, the Petri dishes were kept inside the...
Tipo: Info:eu-repo/semantics/article
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162014000100010

New mechanized system for circle spraying of oil palms seedling emergence
Provedor de dados: 63
Autores: El Pebrian,Darius; Yahya,Azmi.
A new machine system has been designed, developed and evaluated for extensive circle spraying of oil palms (Elaeis guineensis Jacq.) in an effort to overcome the inefficient spraying problem with the conventional spraying system. The machine system consists of a four-wheeled drive 4WD prime mover with front mounted machine attachments for the circle spraying operation. The configuration of the circle spraying attachment consists of a hexagonal curved spray boom, lifting arm, opening-tilting mechanism unit, storage tank, spray pump, solid cone nozzles, and associate hydraulic system. Field performance tests on the machine system showed an average effective field capacity of 7.89 ha per man per day and when compared to the earlier reported effective field...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chemical spraying; Oil palm cultivation; Agricultural machinery; Mechanization.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162012000200002

Alocação de linhagens de milho derivadas das populações BR-105 e BR-106 em grupos heteróticos
Provedor de dados: 63
Autores: Pinto,Rogério de Melo Costa; Garcia,Antonio Augusto Franco; Souza Jr.,Cláudio Lopes de.
Os grupos heteróticos são importantes no melhoramento de milho, pois permitem o uso mais eficiente do germoplasma. Assim, o objetivo deste trabalho foi alocar linhagens de milho em grupos heteróticos a partir de estimativas da capacidade específica de combinação. Oito linhagens S3 da população BR-105 e dez da BR-106, foram cruzadas ao nível interpopulacional seguindo um sistema dialélico. Oitenta híbridos simples foram obtidos e avaliados em látices em três ambientes. Foram avaliados os caracteres produção de grãos (PG), altura da planta (AP) e altura da espiga (AE). As estimativas das capacidades geral (CGC) e específica (CEC) de combinação foram obtidas segundo o método 4, modelo I de Griffing. A partir das estimativas de CEC, as linhagens foram alocadas...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays; Cruzamento dialélico; Capacidade de combinação.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000300016

Avaliação de leguminosas forrageiras (Centrosema spp.) em solos distróficos
Provedor de dados: 63
Autores: Novaes,N.J.; Godoy,R.; Primavesi,A.C.P.A.; Negreiros,G. de F.
Com a finalidade de avaliar a produtividade de acessos de Centrosema, previamente selecionados pelo CIAT para solos de baixa fertilidade, foi instalado na EMBRAPA-CPPSE de São Carlos, em Latossolo Vermelho-Amarelo, um ensaio em blocos ao acaso com quatro repetições, com 23 acessos de C.pubescens (2 testemunhas) e seis de C.acutifolium (2 testemunhas). A produção média de matéria seca dos seis cortes variou de 1240 a 2960 kg/ha e os acessos que apresentaram as maiores produções, foram: Centrosema pubescens BRA 16918 e BRA 16985 e Centrosema acutifolium BRA 9211 e BRA 9229.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Centrosema; Produtividade; Adaptação; Solos distróficos.
Ano: 1994
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000100010

Linhagens diaplóides de trigo obtidas via cultura de antera
Provedor de dados: 63
Autores: Ramos,Luis Carlos da Silva; Camargo,Carlos Eduardo de Oliveira; Ferreira Filho,Antonio Wilson Penteado; Yokoo,Erica Yumi; Castro,Jairo Lopes de; Pettinelli Júnior,Armando; Silva,Marcos Roberto da.
Realizaram-se quatro experimentos de campo no Estado de São Paulo, tanto em condição de sequeiro como de irrigação por aspersão, empregando o delineamento experimental de blocos casualizados, visando a comparação de 20 genótipos de trigo, sendo 18 linhagens diaplóides obtidas e dois cultivares, IAC-24 e Anahuac, quanto à produção de grãos, características agronômicas, resistência à ferrugem-da-folha e outros componentes da produção. Também estudou-se a tolerância ao alumínio em soluções nutritivas em condição de laboratório. As linhagens diaplóides 11, 12, 14, 17 e 18, originárias do cruzamento IAS-63/ALDAN "S"//GLEN/3/IAC-24, de porte baixo, com resistência ao acamamento, com ciclo precoce da emergência ao florescimento e da emergência à maturação e...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Triticum aestivum; Linhagem diaplóide; Cultura de antera; Alumínio.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000100029

Fermentation of irradiated sugarcane must
Provedor de dados: 63
Autores: Alcarde,André Ricardo; Walder,Júlio Marcos Melges; Horii,Jorge.
Bacillus and Lactobacillus are bacteria that usually contaminate the ethanolic fermentation by yeasts and may influence yeast viability. As microorganisms can be killed by ionizing radiation, the efficacy of gamma radiation in reducing the population of certain contaminating bacteria from sugarcane must was examined and, as a consequence, the beneficial effect of lethal doses of radiation on some parameters of yeast-based ethanolic fermentation was verified. Must from sugarcane juice was inoculated with bacteria of the genera Bacillus and Lactobacillus. The contaminated must was irradiated with 2.0, 4.0, 6.0, 8.0 and 10.0 kGy of gamma radiation. After ethanolic fermentation by the yeast (Saccharomyces cerevisiae) the total and volatile acidity produced...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bacteria; Gamma radiation; Yeast.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000400011

Etiology, occurrence and epidemiology of a begomovirus disease in passionflower in the southwest of Bahia
Provedor de dados: 63
Autores: Rodrigues,Gisele Brito; Rocha Sobrinho,Geraldo Gomes; Mituti,Tatiana; Bergamin Filho,Armando; Amorim,Lilian; Rezende,Jorge Alberto Marques; Novaes,Quelmo Silva de.
ABSTRACT: Severe mosaic symptoms, accompanied by yellow spots, abnormally small leaves, fruit malformation and cracking, reduced plant growth, and high levels of whitefly (Bemisia tabaci MEAM1) infestation were observed in passionflower (Passiflora edulis) orchards in southwestern Bahia, Brazil. The aim of this work was to identify the species of begomovirus infecting the passionflowers, its prevalence in southwestern Bahia, and the spatial and temporal dynamics of the disease. Leaf samples from symptomatic plants collected at 57 orchards located in ten counties were evaluated by PCR for begomovirus infection. Complete nucleotide sequences of DNA-A for two isolates revealed 97 % identity with Passionfruit severe leaf distortion virus (PSLDV). The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bemisia tabaci; Geminiviridae; Passifloraceae; Whitefly.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162019001400337

Primed carrot seeds performance under water and temperature stress
Provedor de dados: 63
Autores: Pereira,Márcio Dias; Dias,Denise Cunha Fernandes dos Santos; Dias,Luiz Antônio dos Santos; Araújo,Eduardo Fontes.
Uniformity and percentage of seedling emergence of direct-seeded vegetables have a major impact on their yield and quality. Depending on temperature and soil water potential, carrot seeds performance in the field is poor justifying the use of techniques to accelerate the germination and seedling emergence. The objective of this work was to evaluate the effects of priming treatments, with and without aeration, on carrot seeds performance under water and temperature stress. Two seed lots of carrots, Brasília cultivar, were primed in PEG 6000 -1.0 and -1.2 MPa solutions, for four and eight days, at 20ºC, using two imbibition methods: priming in paper towel moistened with the respective solutions and immersion into aerated osmotic solutions. Non-primed seeds...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Daucus carota L.; Priming; Seedling emergence; Vigor.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000200005

Erratum
Provedor de dados: 63
Tipo: Info:eu-repo/semantics/other
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000500016

Tolerância à salinidade em feijão (Phaseolus vulgaris L)
Provedor de dados: 63
Autores: Broetto,F.; Lima,G.P.P.; Brasil,O.G.
Uma das aplicações das técnicas da cultura de tecidos no melhoramento é a identificação de linhas de células que apresentam tolerância à salinidade. Vários autores obtiveram linhas de células tolerantes ao estresse salino; e estudo de mecanismos bioquímicos da tolerância a sais em plantas tem demonstrado altas correlações entre estes e o acúmulo de macromoléculas em tecido de plantas superiores. Para verificar essas correlações em feijão (Phaseolus vulgaris cv IAC carioca), calos oriundos de eixos embrionários foram cultivados em meio sólido, suplementado com NaCl nas concentrações de 0 a 60 mM. Após 13 dias de incubação, os calos foram coletados e analisados quanto ao crescimento relativo, teor de proteínas, teor de prolina e atividade da peroxidase. Os...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cultura de tecidos; Prolina; Tolerância salina; Peroxidase.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000100028

Partial diallel cross between exotic and adapted maize populations evaluated in acid soil
Provedor de dados: 63
Autores: Morello,Camilo de Lellis; Miranda Filho,José Branco de; Gorgulho,Eliana Patrícia.
In Brazil, acid soils represent a large portion of the agricultural area and the development of cultivars with tolerance to acidity has shown to be feasible. The identification of germoplasm potentially tolerant to acidity was the purpose of this work. Two distinct groups of maize (Zea mays L.) populations were crossed according to the partial diallel mating scheme: Group [1] with six adapted populations and Group [2] with seven exotic varieties. All varieties and crosses were evaluated under the condition of acid and low fertility soil. Traits analyzed were: EY- ear yield, PH- plant height and EH- ear height. Outstanding varieties per se, with yield higher than 3 t ha-1, were SUWAN-2, TAITINGA, TAIÚBA and IUBATÃ in Group [1]; and CUPURICO DMR, TUXPEÑO...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays; Partial diallel; Heterosis; Acid soil; Aluminum tolerance.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000200014

Resistance of tomato genotypes with high level of acylsugars to Tetranychus evansi Baker &amp;amp; Pritchard
Provedor de dados: 63
Autores: Resende,Juliano Tadeu Vilela de; Maluf,Wilson Roberto; Cardoso,Maria das Graças; Faria,Marcos Ventura; Gonçalves,Luciano Donizete; Nascimento,Ildon Rodrigues do.
The Lycopersicon pennellii accession LA716 has been used as a source of arthropod pest resistance in tomato breeding programs due the high contents of acylsugars presents in its leaflets. We investigated the relationship between high foliar acylsugar contents and repellence to spider mite Tetranychus evansi in plants with contrasting acylsugar levels, selected from F2 and BC1F2 (= F2 of the first backcross towards L. esculentum) generations derived from the interespecific cross L. esculentum 'TOM-584' &lt;FONT FACE=Symbol&gt;´&lt;/FONT&gt; L. pennellii LA716. Mite resistance was assessed by a repellence test. Plants selected for high levels of acylsugars in leaflets had mite repellence levels similar to that of LA716. The high correlation confirmed the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lycopersicon esculentum; Lycopersicon pennellii; Allelochemical; Plant breeding; Host plant resistance.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000100005

Variabilidade espacial e temporal do potencial mátrico da água em terra roxa estruturada
Provedor de dados: 63
Autores: Pacheco,F.B.P.; Reichardt,K.; Tuon,R.L.; Bacchi,O.O.S.; Villagra,M.M.
As variabilidades de medidas de potencial mátrico da água no solo e de gradiente de potencial hidráulico são analisadas utilizando conceitos geoestatísticos e estatística da distribuição normal. São analisados 25 pares de dados, coletados ao longo de uma transecção de terra roxa estruturada, de 125 m de comprimento. Autocorrelogramas e semivariogramas não indicaram dependência espacial nas variáveis estudadas. A variabilidade do potencial mátrico da água no solo, medida através de tensiômetros, é menor do que a variabilidade do gradiente de potencial hidráulico. Este último apresentou alta variabilidade, a ponto de comprometer seu uso em estimativas de fluxos de água no solo.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Variabilidade espacial; Variabilidade temporal; Autocorrelação; Semivariograma; Potencial mátrico; Gradiente de potencial hidráulico.
Ano: 1994
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000200020

Testing and validation of DRIS for apple tree
Provedor de dados: 63
Autores: Nachtigall,Gilmar Ribeiro; Dechen,Antonio Roque.
To evaluate three procedures of the calculation of DRIS indices, as well as the efficiency of DRIS as a method for the interpretation of apple tree leaf analyses. This study uses data collected in apple producing areas of the Rio Grande do Sul and Santa Catarina States, Brazil. The concentrations of nitrogen, phosphorus, potassium, calcium, magnesium, boron, copper, iron, manganese, and zinc were determined in the leaf samples. The validation of the DRIS method used results of an experiment of potassium fertilization. The DRIS indices were calculated using two criteria for the choice of the ratio order of nutrients (F value ratio of variance of the relationships among nutrients between the reference group and the low productivity group, and R value -...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Malus Domestica; Foliar diagnosis; Nutritional balance.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000300012

Environmental approach of companies within the pulp/paper, metallurgical and sugar/alcohol sectors
Provedor de dados: 63
Autores: Jacovine,Laércio Antônio Gonçalves; Viana,Wellerson David; Alves,Ricardo Ribeiro; Walter,Michele Karina Cotta; Silva,Márcio Lopes da; Valverde,Sebastião Renato.
Companies have been witnessing major changes in their environment and environmental models have been developed aiming to improve their strategic planning. The objective of this study was to examine the environmental approach adopted by companies within the Pulp and Paper, Metallurgical and Sugar and Alcohol sectors, in order to evaluate their environmental performances. The analysis was based on a matrix which relates managerial functions with a set of environmental approaches and performance indicators, classifying the company environmental performance as weak, moderate or strong. The managerial functions approached in this model are: Management (General, Legal Affairs, Finance, Human Resources and Purchasing); Product and Process Development; Production...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Environment; Managerial functions; Environmental performance.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000100001

Interference of inorganic ions on phenol degradation by the Fenton reaction
Provedor de dados: 63
Autores: Friedrich,Leidi Cecilia; Zanta,Carmem Lúcia de Paiva e Silva; Machulek Jr.,Amilcar; Silva,Volnir de Oliveira; Quina,Frank Herbert.
The addition of Cu2+ ions to the classical Fenton reaction (Fe2+ plus H2O2 at pH 3) is found to accelerate the degradation of organic compounds. This synergic effect causes an approximately 15 % additional reduction of the total organic carbon (TOC), representing an overall improvement of the efficiency of the mineralization of phenol. Although Fe2+ exhibits a high initial rate of degradation, the degradation is not complete due to the formation of compounds refractory to the hydroxyl radical. The interference of copper ions on the degradation of phenol by the Fenton reaction was investigated. In the presence of Cu2+, the degradation is slower, but results in a greater reduction of TOC at the end of the reaction (t = 120 min). In the final stages of the...
Tipo: Info:eu-repo/semantics/article
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162012000600001

Caracterização físico-química da manga 'Tommy Atkins' submetida a aplicação de cloreto de cálcio pré-colheita e armazenamento refrigerado
Provedor de dados: 63
Autores: Silva,Ana Veruska Cruz da; Menezes,Josivan Barbosa.
Avaliou-se a qualidade pós-colheita de manga 'Tommy Atkins' submetida a aplicação pré-colheita de CaCl2 e armazenamento refrigerado. Os fatores estudados foram concentrações de CaCl2 (1% e 2%) e números de aplicações (2,3 e 4 vezes). Houve ainda um tratamento adicional, que funcionou como controle. As pulverizações foliares foram iniciadas cerca de 35 dias após antese, num intervalo de 15 dias. Do total de 280 frutos colhidos, 175 foram levados para análise imediata, enquanto que 105 permaneceram em câmara fria (10ºC) por 30 dias, sendo posteriormente analisados. As concentrações de CaCl2 testadas não resultaram em incremento do teor de cálcio no fruto e também não influenciaram as características de qualidade avaliadas. Houve efeito do número de...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mangifera indica; Cálcio; Colapso interno.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000100012

Boron rates for triticale and wheat crops
Provedor de dados: 63
Autores: Corrêa,Juliano Corulli; Esteves,José Antônio de Fátima; Grassi Filho,Helio; Alves,Elza; Ceccon,Gessi.
No reports are registered on responses to boron fertilization nutrient deficiency and toxicity in triticale crops. The aim of this study was to evaluate triticale response to different rates of boron in comparison to wheat in an hapludox with initial boron level at 0.08 mg dm-3 4 &lt;FONT FACE=Symbol&gt;´&lt;/FONT&gt; 4 factorial design trial completely randomized blocks design (n = 4). Boron rates were 0; 0.62; 1.24 and 1.86 mg dm-3; triticale cultivars were IAC 3, BR 4 and BR 53 and IAPAR 38 wheat crop was used for comparison. The wheat (IAPAR 38) crop presented the highest boron absorption level of all. Among triticale cultivars, the most responsive was IAC 53, presenting similar characteristics to wheat, followed by BR 4; these two crops are considered...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Triticosecale; Triticum aestivum; Absorption.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000200009

Alterações bioquímicas e acúmulo em pacus (Metynnis argenteus) expostos ao paclobutrazol
Provedor de dados: 63
Autores: Jonsson,Claudio Martín; Ferracini,Vera Lúcia; Paraíba,Lourival Costa; Rangel,Maurício; Aguiar,Sandra Regina.
O paclobutrazol, um regulador de crescimento vegetal com propriedades fungicidas, é muito utilizado na região Nordeste do Brasil em áreas de produção de frutíferas. Este composto pode permanecer estável por vários meses após sua aplicação no solo, sendo sua meia vida na água superior a três semanas. Corpos de água superficiais nas proximidades das culturas são portanto susceptíveis de serem contaminados pelo paclobutrazol, com o risco de promover efeitos adversos para a fauna aquática e para a saúde humana. No presente trabalho foi estudada a bioconcentração e algumas alterações bioquímicas, medidas pela atividade das enzimas transaminase glutâmico-oxalacética (TGO), lactato desidrogenase (LDH) e glutationa S-transferase (GST) em tecidos do peixe pacú...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bioconcentração; Peixe; Toxicidade.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000300005

Role of ferritin in the rice tolerance to iron overload
Provedor de dados: 63
Autores: Silveira,Vivian Chagas da; Fadanelli,Cristina; Sperotto,Raul Antonio; Stein,Ricardo José; Basso,Luiz Augusto; Santos,Diógenes Santiago; Vaz Junior,Itabajara da Silva; Dias,Johnny Ferraz; Fett,Janette Palma.
Plants ordinarily face iron (Fe) deficiency, since this mineral is poorly available in soils under aerobic conditions. Nonetheless, wetland and irrigated rice plants can be exposed to excess, highly toxic Fe. Ferritin is a ubiquitous Fe-storage protein, important for iron homeostasis. Increased ferritin accumulation resulting from higher Fe availability was shown in some plant species. However, the role of ferritin in tolerance mechanisms to Fe overload in rice is yet to be established. In this study, recombinant rice ferritin was expressed in Escherichia coli, producing an anti-rice ferritin polyclonal antibody which was used to evaluate ferritin accumulation in two rice (Oryza sativa L.) cultivars, either susceptible (BR-IRGA 409) or tolerant (EPAGRI...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: PIXE; Anti-ferritin antiserum; Metal tolerance.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000400019

N-alkanes to estimate voluntary forage intake of cattle using controlled-release capsules
Provedor de dados: 63
Autores: Oliveira,Dimas Estrasulas de; Manella,Marcelo de Queiroz; Tedeschi,Luis Orlindo; Silva,Sila Carneiro da; Lanna,Dante Pazzanese Duarte.
N-alkanes have been used as internal markers in digestibility trials with ruminants and non-ruminants for more than 20 years. In this study, two trials were conducted under different feeding regimes to (i) evaluate the release rate of n-alkanes of controlled-release capsules in the rumen of rumen-cannulated steers either grazing or restrained in metabolic stalls and (ii) estimate voluntary forage intake of the same steers in metabolic stalls. Six rumen-cannulated Nelore steers were allocated to individual metabolic stalls and were fed diets with varying forage to concentrate ratios (80:20, 60:40, and 40:60; respectively). Corn silage was the only forage source. In the grazing trial, the same steers were evaluated under three feeding managements (Brachiaria...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bovine; Fecal recovery; Hydrocarbons; Markers; Dry matter intake.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000300002

The hatching of cereal cyst nematode (Heterodera avenae) in response to different inorganic ions
Provedor de dados: 63
Autores: Li,Tian Jiao; Wang,Dong Ya; Li,Bing Xue; Wu,Hai Yan.
ABSTRACT Cereal cyst nematode is a major pest of small grain cereals, which causes huge yield losses to crops in China and other parts of the world. In this study, the effects of five inorganic ion concentrations on egg hatching of Heterodera avenae were studied. Results revealed that ZnCl2 and FeCl3 promoted hatching of induced and natural diapausing eggs. The cumulative hatching rates of eggs were 49 % and 13 % at 30 mM ZnCl2 and 10 mM FeCl3, respectively, which were higher than those of other treatments. The hatching ability promoted by ZnCl2 is greater than by FeCl3. Diapause induced eggs in ZnCl2 continued to hatch after 10 days; however, those in FeCl3 mainly hatched in the first two weeks. ZnCl2 had obvious stimulating effects on the hatching of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hatching rate; Ion concentration; Stimulus; Plant–parasitic nematodes.
Ano: 2022
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162022000101201

Alterações estruturais do sistema radicular de soja em resposta à disponibilidade de fósforo no solo
Provedor de dados: 63
Autores: Teruel,Dioger Alexandre; Dourado-Neto,Durval; Hopmans,Jan W.; Reichardt,Klaus.
Tendo em vista que os métodos estatísticos tradicionais de análise dos atributos métricos do sistema radicular são insatisfatórios no que diz respeito à identificação e interpretação de estratégias adotadas pela planta em adaptação ao ambiente edáfico, o objetivo do trabalho foi utilizar conceitos de topologia para analisar as alterações estruturais apresentadas pelo sistema radicular da soja (Glycine max L. Merr. cv. Williams 82) em resposta à disponibilidade de fósforo no solo. Plantas de soja foram cultivadas em recipientes de acrílico preto, em condições controladas de temperatura e fotoperíodo. Dois tratamentos foram estabelecidos, pela adição de solução nutritiva ao substrato dos recipientes: +P (15,5 mg L-1 P) e -P (8,5 mg L-1 P). Utilizando-se...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycine max; Topologia radicular; Fósforo; Nutrientes; Estratégias adaptativas.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000100010

Manipueira como substrato na biossíntese de ácido cítrico por Aspergillus niger
Provedor de dados: 63
Autores: Leonel,M.; Cerada,M.P.
O trabalho teve por objetivo avaliar a viabilidade do uso da manipueira, residuo líquido resultante da prensagem da massa ralada de mandioca, como substrato na biossíntese de ácido cítrico por Aspergillus niger. Os meios de manipueira foram comparados nas mesmas condições de temperatura, a meios sintéticos, utilizados tradicionalmente. Em se tratando de proposta de um novo substrato, foi estudado o armazenamento do resíduo a temperatura ambiente por 72 horas, e realizada a caracterização físico-química da manipueira e dos meios elaborados com esse substrato. Foi avaliada a produção de ácido cítrico nos meios sintéticos e de manipueira. Verificou-se que a produção de ácido cítrico não diferiu quanto ao meio. Não foi observado crescimento do microrganismo...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ácido cítrico; Aspergillus niger; Substrato; Manipueira; Resíduo de mandioca.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000200016

Growth of black pepper plantlets under different substrates and irrigation levels
Provedor de dados: 63
Autores: Cruz,Eleandro Silva da; Medici,Leonardo Oliveira; Leles,Paulo Sérgio dos Santos; Ambrozim,Clodoaldo Spadeto; Souza,Wendell Luccas; Carvalho,Daniel Fonseca de.
ABSTRACT Optimization of the use of water and the possibility of using residues as substrate in the black pepper production chain can yield economic and environmental benefits. The objective of this study was to evaluate the biometric and physiological traits of black pepper plantlets (Piper nigrum L.), cv. Bragantina, at different irrigation levels and soilless substrates. Plantlets were grown for 120 days on three substrates [biosolid + crushed coconut fiber (3:1, by volume); biosolid + granitic rock powder (3:1, by volume); and biosolid + crushed coconut fiber + granitic rock powder (2:1:1, by volume)] and at five irrigation levels [36 % (very low); 55 % (low); 85 % (moderate); 100 % (well-irrigated); and 126 % of the reference irrigation level...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Piper nigrum L; Deficit irrigation; Potting mix; Biosolid; Granitic rock powder.
Ano: 2022
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162022000100601

Growth and sporulation of Metarhizium flavoviride var. Flavoviride on culture media and lighting regimes
Provedor de dados: 63
Autores: Onofre,Sideney Becker; Miniuk,Cindia Mara; Barros,Neiva Monteiro de; Azevedo,João Lúcio.
Entomopathogenic fungi from the genus Metarhizium are largely used for the biological control of agricultural pests by conidia spreading on the field. Although conidia production is well studied in M. anisopliae, only few research studies were done in M. flavoviride. The present work was carried out alming to evaluate the Mycelial growth and sporulation of the entomopathogenic fungus Metarhizium flavoviride var. flavoviride growing at 27 ± 2°C on Potato-dextrose-agar (PDA), Czapek-agar (CZP) and a complete agar medium (CM) under three lighting regimes, (continuous illumination, light/dark cycle and an black light/dark cycle) were investigated. A completely randomized 3 × 3 (culture media × lighting regime) factorial design with four replicates was used....
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Metarhizium flavoviride; Mycelial growth; Culture media; Lighting regimes.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000300026

Micropropagation and callogenesis of Curcuma zedoaria Roscoe
Provedor de dados: 63
Autores: Miachir,Jeanette Inamine; Romani,Vera Lúcia Moretti; Amaral,Antônio Francisco de Campos; Mello,Marcia Ometto; Crocomo,Otto Jesu; Melo,Murilo.
Curcuma zedoaria Roscoe (zedoary) is a medicinal properties-bearing Zingiberaceae from which rhizomes are commercially exploited. The objective of this work was to establish an in vitro protocol for micropropagation and callogenesis of Curcuma zedoaria Roscoe as alternative to improve plant production, turning economically feasible the exploitation of its secondary metabolites which present medicinal properties. Micropropagation by using shoot apexes produced by rhizome and from in vitro plants were carried out on Murashige &amp;amp; Skoog medium supplemented with 2.0 mg L-1 benzyl amino purine and 30 g L-1 sucrose. Plantlets were satisfactorily acclimated to greenhouse conditions by using plastic cover for at least 10 days. Treatment with endomycorrhiza...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zingiberaceae; In vitro culture; Plant production; Cells suspension; Callus.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000400012

Transpiration of young cocoa trees under soil water restriction
Provedor de dados: 63
Autores: Fraga Junior,Luciano Sobral; Vellame,Lucas Melo; Oliveira,Aureo Silva de; Paz,Vital Pedro da Silva.
ABSTRACT: Cocoa plantations in Brazil have been expanding beyond the borders of traditional regions by implementing a strategy based on irrigation and the establishment of crops exposed to full sunlight. The quantification of transpiration is essential to the establishment and management of crops, and is the main factor in the determination of water demand. This study had as its objective the estimating of transpiration of young cocoa trees as a function of reference evapotranspiration (ETo) and soil matric potential (Ψw). Two experiments were conducted, one in a greenhouse and the other in the field, using clones and seminal plants. Soil water content, plant transpiration and reference evapotranspiration were monitored. Cocoa trees were subjected to soil...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Theobroma cacao L.; Sapflow; Evapotranspiration; Water deficit.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000200503

Attraction of Astylus variegatus (Germ.) (Coleoptera: Melyridae) by volatile floral attractants
Provedor de dados: 63
Autores: Ventura,Maurício Ursi; Pereira,Tania; Nunes,Daiane Heloisa; Arruda,Iara Cintra de.
The beetle Astylus variegatus (Germ.) (Coleoptera: Melyridae) is frequently found in flowers feeding on pollen. Responses of A. variegatus to volatile floral attractants were studied in common beans (Phaseolus vulgaris L.) fields. Traps originally designed to capture Diabrotica speciosa (Germ.) (Coleoptera: Chrysomelidae), consisted of plastic bottles (2 L) with 150 holes (5-mm diameter) yellow gold painted and containing inside a plastic strip (3.5 &lt;FONT FACE=Symbol&gt;´&lt;/FONT&gt; 25 cm) with Lagenaria vulgaris (L.) powder (0.28% B cucurbitacin - feeding stimulant and arrestant for diabroticites) sprayed with carbaril insecticide. Treatments consisted of 1,4-dimethoxybenzene (one or two dispensers per trap), 1,4-dimethoxybenze + indole,...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Diabrotica speciosa; Semiochemical; Trap.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000300016

Late pest control in determinate tomato cultivars
Provedor de dados: 63
Autores: Boiça Júnior,Arlindo Leal; Macedo,Marcos Aurélio Anequini; Torres,Adalci Leite; Angelini,Marina Robles.
The usage of insecticidal plants and others insect resistant varieties can be strong allies to the Integrated Pest Management (IPM), being able to reduce the number of insecticides applications and to minimize its effect to the man and the environment.The following control techniques were compared in field conditions, investigating the late pest control of two determinate tomato cultivars: a) Conventional - sprayings of metamidophos, buprofezin, acephate, cipermetrin, abamectin, permetrin, teflubenzuron and lufenuron, applied every three to six days; b) IPM - action threshold of each pest to the spraying of imidacloprid, triflumuron, lufenuron and abamectin; c) IPM - Azadirachta indica (neem) - Action threshold of each pest to the spraying of the nim oil...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Azadirachta indica; Lycopersicon esculentum; Chemical control; Integrated pest management.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000600005

A study of in situ degradability: heterogeneity of variances and correlated errors
Provedor de dados: 63
Autores: Savian,Taciana Villela; Muniz,Joel Augusto.
Degradation models exhibit a non-linear behavior and the selection of a model to describe the degradability depends on the coherence of the model with the involved biological events. The purpose of this study is to evaluate the behavior of the parameters of the degradation model proposed by Mertens &amp;amp; Loften, adjusted to the results of an in situ degradability trial. The experiment evaluated the potential degradable residue of neutral detergent fiber (NDF) of coastcross grass (Cynodon dactylon × Cynodon nlemfuensis) submitted to two cutting ages (30 and 90 days), with three replicates. For each cutting age, the potentially degradable residue of NDF was studied using fifteen incubation times (0; 0,5; 1; 3; 6; 9; 12; 18; 34; 35; 48; 56; 72; 96 e 120...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ruminal degradability; Non-linear regression; Parameters estimation; Coast-cross grass.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000500013

Calibrated heat-pulse method for the assessment of maize water uptake
Provedor de dados: 63
Autores: Santos,Antonio Odair; Bergamaschi,Homero; Rosa,Luiz Mauro G.; Bergonci,João Ito.
Plant water requirements are important aspects of crop production to be determined in the field, in order to judiciously manage crop water usage. Water uptake by field grown maize (Zea mays L.), under well-watered conditions was verified with the heat-pulse system. The temperature difference between two radially inserted thermocouples, one 9 mm above and the other 4 mm below a heater piercing the maize stem, was measured every 0.3 seconds following emission of a heat-pulse. Comparisons of the heat-pulse system outputs, lysimetric measurement and transpiration model estimates were monitored on an hourly and daily basis. At normal and low atmospheric demand daily and hourly values of heat-pulse outputs and lysimetric measurement showed good agreement. Hourly...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sap flow; Transpiration; Heat-pulse.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000100006

Efeitos do ultra-som de baixa intensidade na germinação de sementes de milho (Zea mays L.) sob diferentes condições de disponibilidade hídrica
Provedor de dados: 63
Autores: Hebling,S.A.; Silva,W.R. da.
Foram estudados os efeitos do ultra-som de baixa intensidade (230 e 1750 W/m²) sobre o desempenho de sementes de milho (Zea mays L.) utilizando situações variáveis quanto à disponibilidade hídrica. A emergência e o desenvolvimento de estruturas embrionárias reagem proporcionalmente à disponibilidade de água, não havendo influência marcante do tratamento com ultra-som nos fenômenos envolvidos na germinação das sementes. Contudo, são detectáveis tendências indicadoras de interferência positiva desse tratamento no desenvolvimento das plántulas em situações de deficiência hídrica.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Milho; Sementes; Ultra-som; Disponibilidade hídrica.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000300017

Preferência alimentar de Dione juno juno (Cramer) por genótipos de maracujazeiro e avaliação do uso de extratos aquosos
Provedor de dados: 63
Autores: Lara,Fernando Mesquita; Boiça Júnior,Arlindo Leal; Barbosa,José Carlos.
Avaliou-se a preferência alimentar de lagartas de Dione juno juno (Cramer) por genótipos de maracujazeiro, utilizando-se discos foliares, em condições de laboratório, e lagartas de primeiro e de quarto ínstar, em testes com e sem chance de escolha, com os seguintes materiais: Passiflora alata, P. setacea, P. coccinea, P. cincinnata, P. nitida, e os híbridos P. edulis x P. giberti, P. edulis x P. alata e P. alata2 x P. macrocarpa. Usando-se extrato aquoso de folhas (liofilizado recomposto) procurou-se determinar a presença de repelente, estimulante ou deterrente nos genótipos P. edulis e P. alata. Avaliou-se também a técnica de uso de extrato impregnado em discos de papel filtro e de ágar, em várias concentrações. Os resultados evidenciaram que P. alata, P....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Passiflora spp; Lagarta preta do maracujá; Resistência de plantas; Antixenose.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000300022

Testing and validation of methods for the diagnosis and recomendation integrated system for Signal grass
Provedor de dados: 63
Autores: Silveira,Cristiane Prezotto; Nachtigall,Gilmar Ribeiro; Monteiro,Francisco Antonio.
The Diagnosis and Recommendation Integrated System (DRIS) allows the interpretation of results of leaf analysis through relationships among nutrients, instead of the absolute and isolated concentration of each one, as it is used by the criterion of sufficiency range. The objective was to evaluate three procedures of calculation of DRIS indices, and to verify the efficiency of DRIS as interpretation method for the results of Brachiaria decumbens (Signal grass). The study was developed with the results of six experiments carried out in a greenhouse at Piracicaba, SP, with nutrient solution. Concentrations of N, P, K, Ca, Mg, S, Cu, Fe, Mn, and Zn were used in the samples of recently expanded leaf laminae of the grass. The validation of the DRIS method used...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brachiaria decumbens; DRIS; Foliar diagnosis; Nutritional balance.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000600002

Surface application of gypsum in low acidic Oxisol under no-till cropping system
Provedor de dados: 63
Autores: Caires,Eduardo Fávero; Maschietto,Evandro Henrique Gonçalves; Garbuio,Fernando José; Churka,Susana; Joris,Hélio Antonio Wood.
The conditions in which a favorable response to a gypsum application can be expected on crop yields are not clear. A 3-year field trial was carried out to evaluate the effects of gypsum application on soil chemical attributes and nutrition and yield of corn (Zea mays L.) and soybean (Glycine max L. Merrill) on a clayey Typic Hapludox of high fertility and low acidity under no-till in Guarapuava, Parana State, Brazil. Treatments were arranged in a randomized complete block design with four replications, and consisted of gypsum application on the soil surface at 4, 8, and 12 Mg ha-1. Gypsum application increased the P content in the soil most superficial layer (0.0 - 0.1 m) and also the exchangeable Ca and S-SO4(2-) contents and the Ca/Mg ratio in the soil...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays; Glycine max; Brazil; Phosphogypsum; Calcium; Sulfur.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000200011

Plant response to mechanical resistance and air-filled porosity of soils under conventional and no-tillage system
Provedor de dados: 63
Autores: Silva,Alvaro Pires da; Imhoff,Silvia; Kay,Beverley.
Roots may respond to restrictive soil physical conditions and send signals to shoots to control plant growth. Soil mechanical resistance and aeration can be managed to improve the soil physical conditions for plant growth by using different tillage systems. The objective of this study was to quantify the influence of no-tillage and conventional-tillage systems on plant response to soil mechanical resistance and aeration. The study was carried out on a farm, cultivated with corn, with a side-by-side comparison of no-tillage and conventional-tillage systems. Thirty-two paired sampling sites were located along two transects, located one in each treatment. Soil water content, bulk density, and plant growth were measured in each treatment. Based on the soil...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Plant growth; Plant height; Soil physical properties; Tillage system.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000400016

Honey bee visitation to sunflower: effects on pollination and plant genotype
Provedor de dados: 63
Autores: Chambó,Emerson Dechechi; Garcia,Regina Conceição; Oliveira,Newton Tavares Escocard de; Duarte-Júnior,José Barbosa.
Sunflower (Helianthus annuus L.) is an allogamic plant, which needs insects on flowering, especially the honeybees for seed production. Collecting nectar and pollen by honeybees in agricultural crops is essential to apiculture, as well as a better understanding of plant biology. The foraging behavior of Africanized Apis mellifera L. (Hymenoptera, Apidae) and its efficiency of pollination on seed yield of sunflower genotypes (open pollination and restricted pollination) were evaluated. There were peaks of visits by A. mellifera for nectar collection on the 2nd and 3rd flowering days between 7h00 and 8h30. The average density of A. mellifera during increased visitation ranged from 2.27 to 2.94 bees per capitulum. Nectar collecting bees were more frequent...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Apis mellifera; Pollinators; Floral resources; Yield.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000600007

Climate changes and technological advances: impacts on sugarcane productivity in tropical southern Brazil
Provedor de dados: 63
Autores: Gouvêa,Júlia Ribeiro Ferreira; Sentelhas,Paulo Cesar; Gazzola,Samuel Thomazella; Santos,Marcelo Cabral.
The climatic projections for this century indicate the possibility of severe consequences for human beings, especially for agriculture where adverse effects to productivity of crops and to agribusiness as a whole may occur. An agrometeorological model was used to estimate sugarcane yield in tropical southern Brazil, based on future A1B climatic scenarios presented in the fourth Intergovernmental Panel on Climate Change report, in 2007. Sugarcane yield was evaluated for 2020, 2050, and 2080 considering the possible impacts caused by changes in temperature, precipitation, sunshine hours and CO2 concentration in the atmosphere, as well as technological advances. Increasingly higher temperatures will cause an increase of the potential productivity (PP), since...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Global warming; Water balance; Agrometeorological model; Sugarcane yield.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000500003

An annotated list of ornamentals naturally found infected by Brevipalpus mite-transmitted viruses
Provedor de dados: 63
Autores: Kitajima,Elliot Watanabe; Rodrigues,José Carlos Verle; Freitas-Astua,Juliana.
The first cases of ornamental plants found infected by Brevipalpus transmitted viruses (BTV) were described in the 1990's from the region of Piracicaba, State of São Paulo, Brazil; subsequent cases were from other regions in the country and other American countries. Currently, 37 ornamental plant species (for the sake of simplicity, orchids being considered as a single species), belonging to 18 families of dicotyledons, have been reported hosting BTV. Because of the non systemic type of infection of these viruses, the localized diseases they cause are unimportant usually, but they have the potential to cause economic losses if severe outbreaks of Brevipalpus mite populations occur. Some ornamentals may serve as reservoirs to BTV known to cause serious...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Acari; Tenuipalpidae; Ornamental industry.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000300014

Common resistance to Fusarium head blight in Brazilian wheat cultivars
Provedor de dados: 63
Autores: Mendes,Gabriela da Rocha Lemos; Ponte,Emerson Medeiros Del; Feltrin,Ana Carla; Badiale-Furlong,Eliana; Oliveira,Antônio Costa de.
ABSTRACT: Mycotoxin levels in Fusarium head blight (FHB) infections can be difficult to quantify. The relationship between mycotoxin and disease is not consistent and it is not clear if wheatpathogen interaction is of significance in regions where more than one Fusarium species with distinct trichothecene production ability co-exists. This study aimed to investigate whether a set of eight Brazilian wheat genotypes, varying in resistance according to classification by the breeder, exhibit a common or differential resistance to Fusarium graminearum (Fgra) (deoxynivalenolproducing) and Fusarium meridionale (nivalenol-producing) (Fmer) using full-spike and central spikelet inoculation (type II resistance). Fgra was generally more aggressive than Fmer based on...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Visual assessment; Spray-inoculation; Point-inoculation; Mycotoxins.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162018000500426

ESTIMATIVAS DE HERDABILIDADES E CORRELAÇÕES ENTRE PRODUÇÃO DE GRÃOS E SEUS COMPONENTES PARA CRUZAMENTOS BIPARENTAIS DE TRIGO
Provedor de dados: 63
Autores: Camargo,C.E. de O.
Visando estimar a herdabilidade, em sentido restrito, para número de espigas por planta, número de grãos por espiga, peso de cem grãos e produção de grãos, bem como as correlações entre essas características, foram efetuados cruzamentos entre o cultivar IAC-227 (P1), de porte alto e quatro linhagens mexicanas, de porte baixo: CMH 78.390/ CMH 77A. 917// CMH 79.215 (P2), CMH 79.959/2* CNO 79 (P3), CMH 79.481/ CMH 77A. 917 (P4) e CMH 80A. 747 (P5). Foram estudadas as gerações parentais, F1, F2 e os retrocruzamentos para ambos os pais sendo as avaliações realizadas em plantas individuais. O valor da herdabilidade, em sentido restrito, para número de grãos por espiga foi de 0,717, para o cruzamento P1 x P2, indicando que as seleções para esse caráter poderiam...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Trigo; Produção de grãos; Componentes de produção; Herdabilidade; Correlações.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000100018

Phenotypic, additive genetic and environment correlations of maize landraces populations in family farm systems
Provedor de dados: 63
Autores: Barros,Luciane Bertoletti; Moreira,Rosângela Maria Pinto; Ferreira,Josué Maldonado.
Knowledge of the association between characters is very important in the genetic breeding programs, but there is limited information about correlations between traits in maize landraces in the current literature. The objectives of this study were to estimate phenotypic, additive genetic and environment correlations among traits in maize landraces, which were cultivated in family farm systems, in order to guide the participatory breeding on maize landraces. Between 294 and 400 half-sib progenies from the six populations were evaluated, subdivided in triple 7X7 and 10X10 lattice design, respectively, with single row plots of 4 m long and spaced 1.00 × 0.20 m. Estimates of correlation coefficients are reported for nine traits: grain yield (GY), relation grain...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays L.; Population; Recurrent selection; Participatory breeding.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000600010

Changes in seed quality during fruit maturation of sweet pepper
Provedor de dados: 63
Autores: Vidigal,Deborah de Souza; Dias,Denise Cunha Fernandes dos Santos; Dias,Luiz Antônio dos Santos; Finger,Fernando Luiz.
Studies regarding seed maturation are important to determine the ideal fruit development stage for harvesting in order to obtain high-quality seeds. Changes in sweet pepper (Capsicum annuum L.) seed quality were monitored during seed development in order to identify the stage of maximum quality of the seeds and the optimum harvest date. Fruits harvested from 20 to 75 days after anthesis (DAA) with step of five days were grouped according to maturity stage (green, yellow, red and intense red color outside). Before seed extraction, the fruit weigh, diameter and length were determined. Seed water content, seed dry weight, 1.000-seed weight, germination, first count, speed emergence index, seedling length, accelerated aging and electrical conductivity tests...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Capsicum annuum L.; Maturity; Harvest; Vigour.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000500004

Microsatellite markers for identification of a group of italian olive accessions
Provedor de dados: 63
Autores: Muzzalupo,Innocenzo; Stefanizzi,Francesca; Salimonti,Amelia; Falabella,Rosanna; Perri,Enzo.
Cultivar characterization for fruit trees certification requires fast, efficient and reliable techniques. Microsatellite markers (SSR) were used in the molecular characterization of 23 genotypes of Olea europaea subsp europaea. The DNA from the olive cultivars was analyzed using nine pre-selected SSR primers (GAPU59, GAPU71A, GAPU71B, GAPU103A, UDO99-01, UDO99-12, UDO99-28 and UDO99-39) and revealed 29 alleles, which allowed each genotype to be identified. In the dendrogram, the nine primers allowed the 23 olive genotypes to be grouped into subgroups corresponding to the same cultivar denominations. SSR markers proved to be efficient and reliable for the molecular characterization of Italian olive cultivars.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Olea europaea; Fingerprinting; Genetic identity; Molecular markers.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000500014

Metabolismo de fósforo em bovinos: Incorporação de fósforo radioativo  (32P) pelos eritrócitos
Provedor de dados: 63
Autores: SILVA FILHO,J.C.; VITTI,D.M.S.S.; LOUVANDINI,H.
Com o objetivo de avaliar o efeito da suplementação de P sobre a incorporação de 32P pelos eritrócitos de bovinos como método para diagnóstico da deficiência subclínica desse mineral, doze bezerros mestiços pesando em média 191 kg foram separados do rebanho por 12 semanas. Durante as 6 primeiras semanas os animais consumiram apenas a pastagem, sem receber suplementação mineral. Após esse período, os animais foram suplementados com uma mistura mineral comercial contendo 6,0% P por mais 6 semanas, permanecendo na mesma pastagem. Amostras de sangue foram coletadas a cada 2 semanas. Quatro ml de sangue total foram incubados a 38°C com 1,85 MBq de 32P por 3 horas. As células foram separadas do plasma por centrifugação e lavadas com solução salina por 3 vezes. A...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fósforo; Nutrição; Bovinos; 32P; Eritrócitos.
Ano: 1997
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161997000200011

O pessegueiro no sistema de pomar compacto: VII. comportamento de novas seleções IAC sob poda drástica bienal
Provedor de dados: 63
Autores: Barbosa,W.; Campo-Dall'Orto,F.A.; Ojima,M.; Lovate,A.A.; Santos,R.R. dos.
Pesquisou-se durante seis anos o comportamento reprodutivo de cinco novas seleções de pêssego e nectarina em Monte Alegre do Sul (22°41'S; 46°43'W e 40 HF-7). Os pessegueiros e nectarineiras cultivados nos espaçamentos de 4 x 0,5m e 4 x Im, equivalentes a 5000 e 2500 plantas/ha, respectivamente, foram podados drasticamente, a cada dois anos, após a colheita. Em ambos espaçamentos,'Aurora-2* e IAC 282-24 apresentaram as melhores produções acima de 19 toneladas/ha. Verificou-se nos ciclos subseqüentes a cada poda da copa, tendência de menor produção das plantas, principalmente em material de ciclo mediano. No segundo ano após a poda drástica, os pessegueiros e nectarineiras produziram normalmente. No espaçamento de 4 x 0,5m, as plantas apresentaram acréscimo...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pêssego; Nectarina; Prunus persica; Seleções IAC; Pomar compacto; Poda drástica; Produtividade.
Ano: 1994
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000100015

Temperature and modified atmosphere affect the quality of okra
Provedor de dados: 63
Autores: Finger,Fernando Luiz; Della-Justina,Maria Edith; Casali,Vicente Wagner Dias; Puiatti,Mário.
Little information is available on the influence of temperature on plastic films wrapped okra (Albelmoschus esculentus) for their postharvested conservation. This works investigated the influence of the temperature and PVC film on the development of chilling injury and storability from one of the most popular Brazilian cultivar of okra cv. Amarelinho in fruits stored at 5, 10ºC and at 25ºC. Fruits were harvest at commercial maturity stage with length ranging from 8 to 12 cm, and immediately wrapped in PVC over a polystyrene tray and than stored until visible deterioration or wilting symptoms. Lowering the temperature of storage room from 25 to 10 or 5ºC decreased the weight loss in both PVC wrapped and control fruits, with a lower rate at 5ºC. By reducing...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Albelmoschus esculentus; Chilling injury; PVC film; Relative water content; Chlorophyll.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000400006

Dietary fiber and zinc additives on performance and intestinal health of Escherichia coli challenged piglets
Provedor de dados: 63
Autores: Fernandes,Carolina Dias; Resende,Maíra; Rodrigues,Letícia Mendonça; Garbossa,Cesar Augusto Pospissil; Costa,Leandro Batista; Ferreira,Rony Antônio; Abreu,Márvio Lobão Teixeira de; Cantarelli,Vinícius Souza.
ABSTRACT This study aimed to evaluate the effects of zinc oxide and a low level of encapsulated zinc oxide, with or without dietary fiber, on the performance and intestinal health of weaned piglets. A total of 112 piglets were used, divided into four treatment groups: basal diet with zinc oxide (ZnO); basal diet with zinc oxide and dietary fiber (ZnO+DF); basal diet with encapsulated low zinc oxide (LZnOE); and basal diet with LZnOE and DF (LZnOE+DF). Piglets were challenged with E . coli K88 + , weighed weekly and the fecal score was evaluated daily. One pig per pen was slaughtered to evaluate the production of volatile fatty acids, intestinal microbial populations, intestinal morphology, and digestibility. The encapsulated zinc resulted in lower body...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nutrition; Diarrhoea; Jejunum; Swine; Weaning.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000200403

Extrato aquoso de ramos de Trichilia pallida e o desenvolvimento de Spodoptera frugiperda em genótipos de milho
Provedor de dados: 63
Autores: Torrecillas,Sônia Martins; Vendramim,José Djair.
Avaliaram-se o desenvolvimento e a sobrevivência da lagarta-do-cartucho, Spodoptera frugiperda (J. E. Smith) criada em folhas de dois genótipos de milho (o padrão comercial C 901 e o resistente CMS 23) tratados com extratos aquosos (0,1 e 1%) de ramos da planta inseticida Trichilia pallida Swartz (Meliaceae). As variáveis biológicas avaliadas foram peso, duração e viabilidade das fases larval e pupal. Em plantas tratadas com o extrato a 1%, ocorreu mortalidade total das lagartas nos dois genótipos, enquanto que a 0,1% o extrato reduziu a sobrevivência e o peso larval e prolongou o período de desenvolvimento. Lagartas alimentadas com o genótipo CMS 23 apresentaram menor sobrevivência, menor peso e maior período de desenvolvimento do que no genótipo C 901.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Trichilia pallida; Lagarta-do-cartucho; Milho; Planta inseticida; Resistência de plantas.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000100005

Demand for fisheries products in Brazil
Provedor de dados: 63
Autores: Sonoda,Daniel Yokoyama; Campos,Silvia Kanadani; Cyrino,José Eurico Possebon; Shirota,Ricardo.
Fish consumption per capita in Brazil is relatively modest when compared to other animal proteins. This study analyses the influence of protein prices, other food prices and population income on the fish demand in Brazil. First, the problem of fish supply in Brazil is characterized. It is followed by reviews of the relevant economic theory and methods of Almost Ideal Demand System - AIDS and their elasticity calculations. A descriptive analysis of fish demand in Brazil using the microdata called "Pesquisa de Orçamento Familiar" (Familiar Budget Research) - POF 2002-2003 is presented. Finally, demand functions and their elasticities are calculated for two different cases: one considering five groups of animal proteins (Chicken; Milk and Eggs; Fish;...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: AIDS; Fish; Supply; Elasticity; Market.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162012000500005

Resilience analysis for agricultural systems of north China plain based on a dynamic system model
Provedor de dados: 63
Autores: Li,Hongjun; Liu,Zhijun; Zheng,Li; Lei,Yuping.
This paper presents a case study of resilience theory to understand agricultural systems in the Luancheng County of the North China Plain. A dynanic system model coupled with social, economic and ecological subsystems of agriculture for the Luancheng County was constructed with a time step of one month. The model includes five main components, water resources, profitability, irrigation, crop yield and area. The simulated groundwater table, wheat area and yield, maize area and yield, and rural labor transfer reflected the general trend of the observed data, with calculated determination coefficients higher than 0.88. Resilience of agricultural systems, as indicated by agricultural profitability and food security, were explored for the Luancheng County....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Agricultural management; Water resources; Food production; Natural and socioeconomic systems.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000100002

Universal tail sequence-SSR applied to molecular characterization of tropical maize hybrids
Provedor de dados: 63
Autores: Ribeiro,Carlos Alexandre Gomes; Pinto,Marcos de Oliveira; Maciel,Talles Eduardo Ferreira; Pastina,Maria Marta; Barros,Everaldo Gonçalves de; Guimarães,Claudia Teixeira.
ABSTRACT The development of efficient and low-cost genotyping methods is essential to precise genetic characterization of cultivars. Here, we present a system based on fluorescently labeled universal tail sequence primers (UTSP) to resolve microsatellite (SSR) markers as an alternative for molecular fingerprinting of maize. A set of 20 SSRs using the UTSP presented an average polymorphic information content of 0.84, which provided a probability of random identity ranging from 10−7 to 10−14, and a minimum exclusion power of 99.99998 % in a group of 48 tropical maize single-cross hybrids traded in Brazil. The genetic diversity analysis based on multidimensional scaling explained approximately 28 % of the total variance for the first two coordinates, tending...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays; Fingerprinting; Genotyping; Cultivar protection.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162017000200163

CARACTERIZAÇÃO QUÍMICA E FÍSICA DO JENIPAPO (Genipa americana L.) ARMAZENADO
Provedor de dados: 63
Autores: SILVA,A. P. da; LIMA,C.L.C. de; VIEITES,R. L.
As características do jenipapo (Genipa americana L.) produzido na região de Botucatu-SP, bem como sua conservação pós-colheita foram estudados quando armazenado sob temperatura ambiente e sob refrigeração (10ºC). Os frutos foram avaliados a cada 7 dias quanto à perda de peso, diâmetro, vitamina C, sólidos solúveis totais, acidez total titulável, pH e firmeza. Ao final do período de armazenamento (28 dias de conservação), os resultados mostraram que a temperatura de 10ºC foi adequada para a conservação do jenipapo e, que as características químicas e físicas dos frutos produzidos na região de Botucatu, são comparativamente semelhantes aos produzidos em outras regiões produtoras, com exceção do teor de sólidos solúveis totais que estão abaixo dos relatados.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Genipa americana L.; Pós-colheita; Conservação; Análises; Jenipapo.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000100006

Sinergia da radiação ionizante e do aquecimento na vida de prateleira da uva ‘Itália’
Provedor de dados: 63
Autores: Domarco,Rachel Elisabeth; Spoto,Marta Helena Fillet; Blumer,Lucimara; Walder,Júlio Marcos Melges.
O comportamento de uva cv. Itália, aquecida e irradiada com diferentes doses de radiação ionizante, foi estudado através de análises químicas (teor de sólidos solúveis, acidez titulável e pH) e análise sensorial (aparência e firmeza). Para o experimento, foram utilizados aproximadamente 500g de uva por amostra e 4 repetições por tratamento. Uma parte foi aquecida por imersão em água (50°C por 5 minutos), antes da irradiação, outra parte foi irradiada à temperatura ambiente (22-25°C). Para a irradiação, utilizou-se uma fonte de Cobalto-60, tipo Gammabeam-650, a uma taxa de dose de 1,89 kGy/h. As doses utilizadas foram, 0 (controle), 1, 2, 3, 4 e 5 kGy. Após a irradiação as amostras foram acondicionadas em caixas de papelão e armazenadas sob temperatura de...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Irradiação; Uva; Pós-colheita; Análise sensorial.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000400028

Genetic linkage maps of chicken chromosomes 6, 7, 8, 11 and 13 from a Brazilian resource population
Provedor de dados: 63
Autores: Ambo,Marcel; Campos,Raquel de Lello Rocha; Moura,Ana Sílvia Meira Tavares; Boschiero,Clarissa; Rosário,Millor Fernandes do; Ledur,Mônica Corrêa; Nones,Kátia; Coutinho,Luiz Lehmann.
A linkage map is essential not only for quantitative trait loci (QTL) mapping, but also for the organization and location of genes along the chromosomes. The present study is part of a project whose major objective is, besides from construction the linkage maps, the whole genome scan for mapping QTL for performance traits in the Brazilian experimental chicken population. Linkage maps of chicken chromosomes 6 to 8, 11 and 13 were constructed based on this population. The population was developed from two generations of crossbreeding between a broiler and a layer line. Fifty-one microsatellite markers were tested, from which 28 were informative: 4, 8, 7, 4 and 5 for chromosomes 6, 7, 8, 11 and 13, respectively. A SNP located in the leptin receptor gene was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gallus gallus; Quantitative trait loci (QTL); Genetic maps; Microsatellite markers; Animal breeding.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000500001

Production and vegetative growth of coffee trees under fertilization and shade levels
Provedor de dados: 63
Autores: Jaramillo-Botero,Catalina; Santos,Ricardo Henrique Silva; Martinez,Herminia Emilia Prieto; Cecon,Paulo Roberto; Fardin,Merci Pereira.
It is difficult to separate the effects of light reduction versus nutrient and water competition in agroforestry systems. The objective of this experiment was to evaluate the effect of shading and fertilizer supply on the vegetative development and yield of Coffea arabica over six years. The coffee trees were covered with shade screens (photosynthetically active radiation reduction up to 48%) and fertilized from 100 to 40% of the recommended amount from 2001 on. Leaf area, number of leaves, number of nodes, leaf area per branch and, yield were determined. Although no effect of fertilization was found, shading influenced the number of nodes, leaf area and production from the third year on. The number of nodes and yield decreased as shading increased. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coffea arabica; Bienniallity; Plant growth and development; Yield.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000600004

Performance of cylindrical leaf wetness duration sensors in a tropical climate condition
Provedor de dados: 63
Autores: Santos,Eduardo Alvarez; Sentelhas,Paulo Cesar; Gillespie,Terry James; Lulu,Jorge.
Leaf wetness duration (LWD) measurements are required for disease warning in several agricultural systems, since it is an important variable for the diagnose of plant disease epidemiology. The cylindrical sensor is an inexpensive and simple electronic LWD sensor initially designed to measure this variable for onions, however some studies show that it may be helpful for standard measurements in weather stations and also for different crops. Therefore, the objective of this study was to assess their performance under tropical climate conditions, in Brazil, having as standard measurements those obtained by flat plate sensors, which have presented very good performance when compared with visual observations. Before field assessments, all LWD sensors used in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Deployment angle; Electronic sensors; Dew; Rain; Disease-warning systems.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000700003

Repeatability coefficients and genetic gains in table grape progenies for the Brazilian semi-arid region
Provedor de dados: 63
Autores: Leão,Patrícia Coelho de Souza; Nunes,Bruna Thaís Gonçalves; Souza,Emille Mayara Carvalho de.
ABSTRACT: Table grape stands out among the main fruit-bearing plants of irrigated agriculture in the São Francisco Valley region of Brazil. This study estimated repeatability and heritability coefficients and predicted genetic gains in order to select superior genotypes in grape progenies from controlled hybridizations using the Restricted Maximum Likelihood/Best Linear Unbiased Prediction (REML/BLUP) methodology. Individual plants were evaluated for the variables of production (kg per plant), number of bunches, bunch weight (g), berry diameter (mm), and soluble solids content (°Brix). We evaluated 194 hybrids from 30 crosses between Vitis vinifera and interspecific hybrids in Juazeiro, Bahia State, Brazil, over four growing seasons. Repeatability...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vitis sp.; REML/BLUP; Grapevine; Grape breeding.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162018000500387

Individual tree growth models for eucalyptus in northern Brazil
Provedor de dados: 63
Autores: Martins,Fabrina Bolzan; Soares,Carlos Pedro Boechat; Silva,Gilson Fernandes da.
The diameter and height growth model is one of three submodels used for simulating individual tree growth. In Brazil, there are few studies on the dimensional growth of individual trees be they native or exotic species, despite their potential. This study aimed to evaluate diameter and height growth models for individual trees for eucalyptus stands and to validate the best fitting model. Tree diameter and height data were obtained from 48 permanent plots of unthinned stands of Eucalyptus grandis × Eucalyptus urophylla hybrid located in northern Brazil. The evaluation of the diameter and height growth models was based on adjusted coefficient of determination, standard error of estimate as a percentage, trend, root mean square error and Akaike Information...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Growth and yield models; Forest growth prediction; Tree-level models.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162014000300006

Application of computational fluid dynamics on a study in swine facilities with mechanical ventilation system
Provedor de dados: 63
Autores: Sousa Junior,Vilmar Rodrigues de; Sabino,Luana Araújo; Moura,Daniella Jorge de; Nunhez,José Roberto; Sonoda,Lilia Thays; Silva,Alexandre Oliveira; Prada,Ronald Jaimes; Fontoura,Diener Volpin Ribeiro; Seber,Rogério Torres.
ABSTRACT: Ventilation systems used in swine facilities deserve to be studied because they directly affect productivity in the pig farming sector. Bearing this in mind the uniformity of air distribution and temperature is essential to animal welfare in this breeding environment. Thus, the purpose of this study was to identify whether changes in air entrances and exhaust fan positioning could influence air velocity and temperature distribution. The experimental data were collected in a commercial full-scale sow facility. Validation was carried out by comparing the simulated air temperatures and data measured in the field. These results showed agreement between data with a maximum relative error of approximately 3 %. The real settings showed a gradual...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: CFD; Airflow pattern; Temperature distribution.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162018000300173

Extração de nutrientes e eficiência nutricional de cultivares de aveia, em relação ao nitrogênio e à intensidades de corte
Provedor de dados: 63
Autores: Primavesi,Ana Cândida; Primavesi,Odo; Godoy,Rodolfo.
Com o objetivo de verificar o efeito de doses de nitrogênio e regimes de corte na extração de nutrientes, na eficiência de seu aproveitamento, bem como avaliar o potencial de exportação de minerais pela forragem e grãos, e a ciclagem de minerais pela palhada, foi conduzido um experimento, em Latossolo Vermelho-Escuro, irrigado, em blocos ao acaso, com quatro repetições e parcelas sub-subdivididas, com os cultivares de aveia São Carlos e UPF 3. Doses crescentes de N alteraram a curva de extração de S e N na forragem do cv. São Carlos, no primeiro corte, de K na forragem de ambos cultivares, no segundo corte, e de S na forragem acumulada de ambos cortes e cultivares, além da extração do P pela palha de ambos cultivares e de Zn, Cu e Mn do cv. São Carlos....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Avena sativa; Avena byzantina; Regimes de corte; Extração de nutrientes; Forragem; Grãos; Palha; Doses de nitrogênio.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000300014

Size and form of plots for the culture of the Italian pumpkin in plastic greenhouse
Provedor de dados: 63
Autores: Mello,Rodrigo Machado; Dal'Col Lúcio,Alessandro; Storck,Lindolfo; Lorentz,Leandro Homrich; Carpes,Ricardo Howes; Boligon,Alexandra Augusti.
Quality control is the guaranty that experimental error is kept under acceptable levels, and the definition of the proper size and form of experimental plots ensures acurate experimental planning. This paper aims to determine the proper plot size and shape for the culture of the Italian pumpkin in protected environments. Two experiments were set in plastic green house in distinct crop seasons: either Summer-Fall or Winter-Spring season. The experiment comprised eight, 23-m long lines with 20 plants each, and fruit weight was considered the main performance parameter. Estimates of best plots size and shape were obtained by the maximum curvature, variance comparison and Hatheway methods. The plot size and shape varied according to the season and the ideal...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Curcubita pepo; Protected environment; Experiment planning; Quality control.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000400017

EFEITOS DE STIMULATE E DE MICRO-CITROS NO  DESENVOLVIMENTO VEGETATIVO E NA PRODUTIVIDADE DA  LARANJEIRA `PÊRA' (Citrus sinensis L. Osbeck)
Provedor de dados: 63
Autores: Castro,P.R.C.; Pacheco,A.C.; Medina,C.L.
Estudou-se o efeito de aplicações do estimulante vegetal Stimulate e do fertilizante foliar Micro-Citrus no número de ramos, comprimento dos ramos, número e caracterização de frutos na colheita da laranjeira `Pêra' (Citrus sinensis L. Osbeck) sobre limoeiro `Cravo'. O experimento foi realizado em condições de campo, num Latossolo Vermelho-Escuro Álico, em Holambra (S.P.), sendo que em 13/02, 22/04 e 17/06/96 foram efetuadas pulverizações com Stimulate (1 L.ha-1, 2L. ha-1 e 4L. ha-1), Stimulate 2L. ha-1 + Micro-Citros e Micro-Citros, além do controle. Realizaram-se seis tratamentos distribuídos em dez árvores inteiramente casualizadas em um pomar uniforme com seis anos de idade. Foram demarcadas quatro ramificações em diagonal, nas quais efetuaram-se...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Estimulante vegetal; Nutrição; Citros.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000200026

Control of algal growth on greenhouse surfaces using commercial algaecides
Provedor de dados: 63
Autores: Berthold,David Erwin; Elazar,Ariel; Lefler,Forrest; Marble,Christopher; Laughinghouse IV,Haywood Dail.
ABSTRACT Greenhouses and nurseries provide ideal environments for facilitating the formation of nuisance algal mats. Algal growth poses safety concerns to horticulturists and stimulates the propagation of unwanted plant pests and pathogens. To date, few strategies and data are available to effectively manage algal problems. The effectiveness of five algaecides was tested on two varying surfaces of greenhouses in situ to elucidate the efficacy of chemical methods of removing algae. Moreover, Nostoc commune (Vaucher ex Bornet &amp; Flahault) was treated on ceramic tiles in vitro , as it is a common alga in greenhouses and nurseries. We found that each algaecide had different effects, depending on the chemical applied, the surface to which the chemical was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nostoc commune; DNA; Cyanobacteria; Herbicides; Management.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000101601

Small relief shape variations influence spatial variability of soil chemical attributes
Provedor de dados: 63
Autores: Souza,Zigomar Menezes de; Marques Júnior,José; Pereira,Gener Tadeu; Barbieri,Diogo Mazza.
Soils with small variations in relief and under the same management system present differentiated spatial variabilities of their attributes. This variability is a function of soil position in the landscape, even if the relief has little expression. The aim of this work was to investigate the effects of relief shape and depth on spatial variability of soil chemical attributes in a Typic Hapludox cultivated with sugar cane at two landscape compartments. Soil samples were collected in the intercrossing points of a grid, in the traffic line, at 0-0.2 m and 0.6-0.8 m depths, comprising a set of 100 georeferenced points. The spatial variabilities of pH, P, K, Ca, Mg, cation exchange capacity and base saturation were quantified. Small relief shape variations lead...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Geostatistics; Kriging; Relief; Sugar cane.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000200008

COMPONENTES DE PRODUÇÃO E PRODUTIVIDADE DE GRÃOS DE ARROZ DE SEQUEIRO EM FUNÇÃO DO ESPAÇAMENTO E DA DENSIDADE DE SEMEADURA
Provedor de dados: 63
Autores: Crusciol,Carlos Alexandre Costa; Machado,José Ricardo; Arf,Orivaldo; Rodrigues,Ricardo Antonio Ferreira.
O presente trabalho teve por objetivo estudar três espaçamentos entre fileiras (30, 40 e 50 cm) e três densidades de semeadura (100, 150 e 200 sementes viáveis/m2) quanto a fenologia da planta, os componentes da produção e a produtividade de grãos do arroz de sequeiro cv. IAC 201. Desta forma, foi instalado um experimento em condições de campo, em um Latossolo Vermelho escuro, epi-eutrófico, textura argilosa, em Selvíria, MS. A redução do espaçamento entre fileiras aumentou o número de colmos e de panículas. O aumento da densidade de semeadura reduziu o perfilhamento por planta. A densidade de 100 sementes/m2 é mais adequada para o cultivar IAC 201. Em cultivo de sequeiro sob alta precipitação e boa distribuição pluvial, o espaçamento de 30 cm entre...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Oryza sativa; População de plantas; Arranjo espacial de plantas.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000100009

OBTENÇÃO DE PLANTAS DE LIMÃO CRAVO (Citrus limonia Osbeck) E TANGERINA CLEÓPATRA (Citrus reshni Hort.) A PARTIR DO CULTIVO DE PROTOPLASTOS DE SUSPENSÃO CELULAR
Provedor de dados: 63
Autores: Latado,Rodrigo Rocha; D'utra Vaz,Fernando Berlink; Tulmann Neto,Augusto.
Este trabalho descreve uma metodologia para a regeneração de plantas de tangerina 'Cleópatra' e limão 'Cravo', a partir do cultivo de protoplastos de suspensão celular. Para tal, calos nucelares foram induzidos em meio contendo BAP e cultivados em meio sem reguladores de crescimento. Protoplastos foram isolados de suspensões celulares e cultivados em gotas de agarose, com densidade de 2 X 105 protoplastos.ml-1. O meio MT, contendo ácido giberélico e água de coco, foi eficiente na germinação de embriões somáticos. Os métodos de aclimatação de plantas testados apresentaram baixa eficiência. Como resultado final, 17 plantas adaptadas de tangerina e 8 de limão foram obtidas.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Citros; Protoplastos; In vitro; Suspensão; Porta-enxerto.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000200023

Shade level effects on yield and chemical composition of the leaf essential oil of Pothomorphe umbellata (L.) Miquel
Provedor de dados: 63
Autores: Mattana,Raquel Souza; Vieira,Maria Aparecida Ribeiro; Marchese,José Abramo; Ming,Lin Chau; Marques,Márcia Ortiz Mayo.
Pothomorphe umbellata (L.) Miquel, is a medicinal species that belong to the Piperaceae family and commonly called "pariparoba" and "caapeba". It grows in regions rich in humus, humidity and under the shade of trees, which contribute for its best growth as it is considered a species sciophyte. The effect of shade on the yield and chemical composition of essential oil of Pothomorphe umbellata (Piperaceae) leaves was evaluated. Nine-month-old seedlings were planted in October 2002 and subjected to three shade levels (30%, 50%, 70%) and full sun; the experimental design was in randomized blocks, with four treatments and six replications, in split-plot in time scheme. Two harvests of aerial part were made (05/2003 and 05/2004). Essential oil was extracted by...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Piperaceae; Cultivation systems; Trans-nerolidol; Medicinal plant.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000400006

Genetic variability for girth growth and rubber yield in Hevea brasiliensis
Provedor de dados: 63
Autores: Gonçalves,Paulo de Souza; Silva,Marcelo de Almeida; Gouvêa,Ligia Regina Lima; Scaloppi Junior,Erivaldo José.
Basic knowledge of genetic characteristics of populations is necessary to conduct effective breeding and selection. The objective of this paper is describing the genetic variation of rubber yield and the correlation with other traits, and estimating the genetic parameters for girth growth and total number of latex vessels. Sixty seven clones of Hevea brasiliensis (Willd. ex Adr. de Juss.) Muell.-Arg. were tested at five sites during 10 years. Characters girth growth at panel opening and rubber yield, showed broad sense heritability on plot mean level, from 0.32 to 0.66 and 0.59 to 0.92, respectively. Predicted genetic gains equal to 0.73 cm and 0.79 g increase respectively on girth and yield in the opening panel and mature phases seems realistic, even with...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Rubber tree; Heritability; Genetic correlations; Genotype-environment interaction.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000300006

Development and validation of new SSR markers from expressed regions in the garlic genome
Provedor de dados: 63
Autores: Ipek,Meryem; Sahin,Nihan; Ipek,Ahmet; Cansev,Asuman; Simon,Philipp W.
Only a limited number of simple sequence repeat (SSR) markers is available for the genome of garlic (Allium sativum L.) despite the fact that SSR markers have become one of the most preferred DNA marker systems. To develop new SSR markers for the garlic genome, garlic expressed sequence tags (ESTs) at the publicly available GarlicEST database were screened for SSR motifs and a total of 132 SSR motifs were identified. Primer pairs were designed for 50 SSR motifs and 24 of these primer pairs were selected as SSR markers based on their consistent amplification patterns and polymorphisms. In addition, two SSR markers were developed from the sequences of garlic cDNA-AFLP fragments. The use of 26 EST-SSR markers for the assessment of genetic relationship was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Expressed sequence tags (EST); Simple sequence repeat markers; Genetic relationship.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162015000100041

Época de colheita e desenvolvimento vegetativo de aveia preta
Provedor de dados: 63
Autores: Rossetto,Claudia Antonia Vieira; Nakagawa,João.
Embora a aveia preta apresente importantes características de interesse agronômico, os estudos direcionados ao conhecimento da planta visando aumentos de produtividade são ainda em pequeno número em condições brasileiras. Este trabalho teve por objetivo avaliar o desenvolvimento de plantas de aveia preta, cultivar Comum. O experimento foi instalado no mês de maio, em condições de campo, em Nitossolo Vermelho, em Botucatu, SP. O delineamento experimental empregado foi inteiramente casualizado, com três repetições. Os tratamentos constaram de épocas de coletas de plantas, as quais foram iniciadas aos 21 dias após a emergência das plântulas (DAE). O maior desenvolvimento vegetativo das plantas, considerando-se o número total de perfilhos e o número total de...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Avena strigosa; Ciclo cultural; Perfilhos.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000400013

Importância da reatividade do calcário sobre a produção e algumas característica da cultura da soja
Provedor de dados: 63
Autores: Bellingieri,P.A.; Souza,E.C.A.; Alcarde,J.C.; Shikasho,H.W.
O experimento foi conduzido num latossolo vermelho escuro, textura média, localizado em Jaboticabal-SP, para se estudar o efeito de dois calcários (dolomítico e dolomítico calcinado), com quatro graus de finuras (F1 = &gt; 2mm; F2 = 2-0,84 mm; F3 = 0,84-0,30mm e F4 = &lt; 0,30mm), sobre propriedades químicas desse solo durante dois anos agrícolas (1988/89 e 89/90) e em características agronômicas da soja cv. IAC-8. Concluiu-se que: no 1° ano agrícola (88/89) o calcário calcinado foi mais reativo, bem como as granulometrias mais finas, sendo que a produção de grãos aumentou em 14%; no 2° ano (89/90), os calcários e as finuras tenderam a igualar seus efeitos e a produção de grãos não foi alterada; para as análises foliares e de grãos, somente houve efeito...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Calcáreo; Tamanho de partícula; Soja; Reatividade.
Ano: 1992
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161992000400010

Phytoplasma associated with shoot proliferation in begonia
Provedor de dados: 63
Autores: Ribeiro,Luiz Fernando Caldeira; Mello,Ana Paula de Oliveira Amaral; Bedendo,Ivan Paulo; Gioria,Ricardo.
Begonia is a very appreciated genus of ornamental plants, of economic relevancy, having species of flowers and foliage. In commercial croppings, plants exhibiting characteristic symptoms of phytoplasma infection have been observed, such as shoot proliferation, reduced plant, size small leaves and flowers, and phyllody. Leaves were sampled and total DNA was extracted to be used in nested Polymerase Chain Reaction (PCR), in order to detect and identify an expected phytoplasma. The results confirmed consistently the presence of a phytoplasma associated with symptomatic plants through the amplification of a typical genomic fragment of 1.2 kb by using the universal primers R16mF2/mR1 and R16F2n/R2. The use of specific primers R16(III)F2/R1 allowed to identify...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mollicutes; Yellows; Phytopathogenic prokaryotes.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000500009

Quantitative analysis by energy dispersive X-ray fluorescence by the transmission method applied to geological samples
Provedor de dados: 63
Autores: Simabuco,S.M.; Nascimento Filho,V.F.
Three certified samples of different matrices (Soil-5, SL-1/IAEA and SARM-4/SABS) were quantitatively analysed by energy dispersive X-ray fluorescence with radioisotopic excitation. The observed errors were about 10-20% for the majority of the elements and less than 10% for Fe and Zn in the Soil-5, Mn in SL-1, and Ti, Fe and Zn in SARM-4 samples. Annular radioactive sources of Fe-55 and Cd-109 were utilized for the excitation of elements while a Si(Li) semiconductor detector coupled to a multichannel emulation card inserted in a microcomputer was used for the detection of the characteristic X-rays. The fundamental parameters method was used for the determination of elemental sensitivities and the irradiator or transmission method for the correction of the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Quantitative analysis; X-ray fluorescence; Geological samples; Energy dispersive.
Ano: 1994
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000200001

Mass transfer in beef: effect of crossbreeding and ultrasound application
Provedor de dados: 63
Autores: Sanches,Marcio Augusto Ribeiro; Silva,Patrícia Maria Onofre Colombo; Barbosa,Roger Darros; Romero,Javier Telis; Barretto,Andrea Carla da Silva.
ABSTRACT: Cuts of muscle (biceps femoris) from three crossbreeds between the Nelore, Angus and Wagyu breeds of cattle (Crossbreed 1 (C1): ½ Angus and ½ Nelore; Crossbreed 2 (C2): ¾ Angus and ¼ Nelore; Crossbreed 3 (C3): ½ Wagyu, ¼ Nelore and ¼ Angus) were characterized by their chemical composition, pH, water activity and lipid oxidation. The cuts were submitted to wet brining in a 5 % NaCl concentration at 5 °C with either static brine (SB) or brine assisted with ultrasound (US). Samples of the treatments were taken after 30, 60, and 120 min of wet brining for later analysis. The experimental data were adjusted using the Peleg and Page models, and the Page template best described the experimental data. The crossbreeding did not affect the water and ash...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: NaCl; Wagyu; Angus; Nelore; Water gain.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000500902

The recent similarity hypotheses to describe water infiltration into homogeneous soils
Provedor de dados: 63
Autores: Reichardt,Klaus; Timm,Luís Carlos; Dourado-Neto,Durval.
ABSTRACT A similarity hypothesis recently presented to describe horizontal infiltration into homogeneous soils, developed for coarse-textured soils like sieved marine sand, implies that the soil water retention function θ(h) is the mirror image of an extended Boltzmann transform function θ(λ2). A second hypothesis applicable to vertical infiltration suggests that the soil water retention function θ(h) is also the mirror image of the soil water profile θ(z). Using previously published infiltration data, we investigated whether these two similarity solutions successfully describe infiltration into two “normal” soils. Although the theory using the first similarity assumption adequately describes horizontal cumulative infiltration and infiltration rate into...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Boltzmann function; Mirror image; Wetting front.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000400379

Global plant hardiness zones for phytosanitary risk analysis
Provedor de dados: 63
Autores: Magarey,Roger D.; Borchert,Daniel M.; Schlegel,Jay W.
Plant hardiness zones are widely used for selection of perennial plants and for phytosanitary risk analysis. The most widely used definition of plant hardiness zones (United States Department of Agriculture National Arboretum) is based on average annual extreme minimum temperature. There is a need for a global plant hardiness map to standardize the comparison of zones for phytosanitary risk analysis. Two data sets were used to create global hardiness zones: i) Climate Research Unit (CRU) 1973-2002 monthly data set; and ii) the Daily Global Historical Climatology Network (GHCN). The CRU monthly data set was downscaled to five-minute resolution and a cubic spline was used to convert the monthly values into daily values. The GHCN data were subjected to a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Climate; Plant diseases; Minimum temperature.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000700009

Sugar cane yield estimation by satellite images
Provedor de dados: 63
Autores: Rocha,Jansle Vieira; Fernandes,Jeferson Lobato.
Tipo: Info:eu-repo/semantics/article
Ano: 2023
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011010200001

Efeito da utilização de acaricidas em citros, sobre a população de Brevipalpus phoenicis (Geijskes, 1939) e ácaros predadores (Phytoseiidae)
Provedor de dados: 63
Autores: Sato,M.E.; Raga,A.; Cerávolo,L.C.; Cezário,A.C.; Rossi,A.C.
Foi conduzido experimento com o objetivo de estudar o efeito de alguns acaricidas sobre Brevipalpus phoenicis (Geijskes,1939) (AcarirTenuipalpidae) e ácaros predadores (Phytoseiidae), em citros. Os produtos testados e as dosagens em g i.a./100 / de água foram: fenpyroximate (5,0), acrinathrin (0,5); hexythiazox (1,5); amitraz (40,0) e enxofre (225,0). Os acaricidas fenpyroximate, acrinathrin e hexythiazox foram eficientes contra B. phoenicis até 127 dias após a aplicação, enquanto que, o enxofre e o amitraz apresentaram bom controle até 92 e 58 dias após o tratamento, respectivamente. O hexythiazox foi praticamente inócuo aos ácaros predadores mas os demais acaricidas foram significativamente prejudiciais a estes ácaros. Os produtos enxofre, fenpyroximate...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brevipalpus phoenicis; Controle químico; Phytoseiidae; Citros.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000200013

Relações hídricas em seringal no município de Piracicaba, SP
Provedor de dados: 63
Autores: Mendes,M.E.G.; Villagra,M.M.; Souza,M.D. de; Bacchi,O.O.S.; Reichardt,K.
Em um estudo das relações hídricas de um seringal de 5 anos de idade, implantado na região sudeste do Brasil em 1984 são mostradas variações de umidade do solo, potencial da água no solo, distribuição radicular, interceptação de precipitação pluvial e escoamento superficial. Resultados indicam a estreita faixa de retenção de água da terra roxa estruturada e a alta correlação entre as variações de potencial da água no solo e a distribuição radicular. O seringal apresentou um sistema radicular com raízes superficiais (0-30cm) se estendendo até a projeção das copas e raízes profundas, atingindo mais de 2,5m. O perfil de solo não apresentou escoamento subsuperficial de água ao longo do declive de 10%, mas apresentou significantes perdas superficiais, chegando...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Seringueira; Distribuição radicular; Umidade do solo; Potencial da água no solo; Runoff; Interceptação de chuva.
Ano: 1992
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161992000400014

Selectivity of the plant growth regulators trinexapac-ethyl and sulfometuron-methyl to cultivated species
Provedor de dados: 63
Autores: Correia,Núbia Maria; Leite,Gilson José.
The aerial spraying of plant ripeners on sugar cane (Saccharum officinarum L.) crops causes often the contamination of neighboring areas, which subsidizes formal complaints from the neighbors. These contaminations are due to spraying taking place during inadequate environmental conditions or from technical mistakes during the application. One of the most important causes of this contamination is the susceptibility of the species being cultivated surrounding sugar cane. In order to evaluate the effects of sugar cane plant ripeners trinexapac-ethyl and sulfometuron-methyl on peanuts, cotton, potato, coffee, citrus, beans, sunflower, cassava, rubber, soybean, and grapes, eleven experiments - one for each species - were carried out from May 2009 to Jan. 2010....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phytointoxication; Ripener; Sugar cane.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162012000300004

UTILIZAÇÃO DA PRÓPOLIS E ÁLCOOL ETÍLICO NO CONTROLE DE Salmonella EM RAÇÕES AVÍCOLAS
Provedor de dados: 63
Autores: MAZZUCO,H.; SILVA,R. D. de M. e; BERCHIERI Jr.,A.; OLIVEIRA,E. de.
Em quatro experimentos foram avaliados como agentes antibacterianos os produtos própolis em solução alcoólica e álcool etílico, adicionados às rações artificialmente contaminadas com os respectivos sorotipos: Salmonella typhimurium Nalr - Specr, (resistentes ao ácido Nalidíxico e a Spectinomicina) nos três primeiros experimentos e Salmonella agona Nalr - Specr, Salmonella infantis Nalr - Specr e Salmonella enteritidis Nalr - Specr no quarto experimento. As rações foram fornecidas a grupos de 10-16 pintos de corte de um dia. Em todos os experimentos os produtos testados foram adicionados na base de 2% da ração. Quando se utilizou solução hidroalcóolica de própolis (exp. 1), seguidas 120 horas após o desafio, detectou-se a presença da bactéria nos cecos. No...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Salmonella; Rações avícolas; Controle; Própolis; Álcool etílico; Frangos de corte.
Ano: 1996
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161996000100001

Attraction of Bucephalogonia xanthophis (Hemiptera: Cicadellidae) to volatiles of its natural host Vernonia condensata (Asteraceae)
Provedor de dados: 63
Autores: Bento,José Maurício Simões; Arab,Alberto; Zacarin,Giuliano Grici; Signoretti,André Gustavo Corrêa; Silva,José Wilson Pereira da.
Plant volatiles are important cues for the orientation of herbivorous insects. It is possible that these compounds indicate whether the plant is suitable for feeding and larval development, or for mating aggregation. Vernonia condensata (Asteraceae) is known to attract species of leafhoppers, most of them important vectors of the citrus variegated chlorosis (CVC). In this study, we evaluated the role of volatiles of V. condensata on the orientation of Bucephalogonia xanthophis (Hemiptera: Cicadellidae). Four-arm olfactometer bioassays showed that only males were attracted to the volatiles of the host-plants Citrus sp. and V. condensata. Furthermore, fresh leaves of V. condensata induced a stronger response than volatiles from hexane-extracted leaves. This...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Plant-herbivore interaction; Leafhopper; Trichomes.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000600010

Características das raízes e do amido de Pachyrhizus ahipa em diferentes épocas de plantio e estádios de desenvolvimento da planta
Provedor de dados: 63
Autores: Leonel,Magali; Ferrari,Tainara Bortolucci; Sarmento,Silene Bruder Silveira; Oliveira,Marcelo Alvares de.
De forma geral, as características do amido variam não somente com a planta de origem, mas também com o estádio de desenvolvimento desta. Neste trabalho objetivou-se avaliar a influência da época de plantio e estádio de desenvolvimento da planta de ahipa sobre as características físico-químicas das raízes, tamanho de grânulos do amido e suas propriedades viscográficas. Constatou-se influência do estádio de desenvolvimento da planta nas características físico-químicas das raízes e do amido, independentemente da época de plantio. A melhor época para o plantio de Pachyrhizus ahipa é outubro e a colheita deve ser feita no máximo com 9 meses, adotando-se o procedimento de retirada das flores a partir dos 3 meses.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Jacatupé; Amido; Viscosidade; Microscopia.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000600003

Nitrogen removal from swine wastewater by combining treated effluent with raw manure
Provedor de dados: 63
Autores: Kunz,Airton; Steinmetz,Ricardo; Damasceno,Simone; Coldebela,Arlei.
Effluents from swine raising can be harmful to the environment if not correctly managed. Nitrogen (N) is usually the main element present at high concentrations in the effluent. Since the use as biofertilizer is not always a feasible alternative, the treatment of swine wastewater is necessary. Variations in N species and water solubility make the treatment difficult and expensive. Additional N removal at low cost via denitrification may be possible by recirculating nitrified effluent in the barns. In this study, raw manure (RM) was homogenized with treated effluent (TE) at RM/(RM + TE) ratios of 1.0, 0.9, 0.8, 0.7, 0.6, 0.5 and 0 in order to simulate the effect of reused water on swine wastewater nitrogen removal. Samples were collected daily during four...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nutrient removal; Swine effluent; Treatment; Water reuse.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162012000600002

Alternative products in the "in vitro" inhibition of Sclerotinia sclerotiorum
Provedor de dados: 63
Autores: Mello,Alexandre Furtado Silveira; Lourenço,Silvia de Afonseca; Amorim,Lilian.
The white mold, caused by Sclerotinia sclerotiorum, is a very important disease in tomato crops. The objective of this work was to study the effect of plant extracts, animal residues and industrial by-products extracts on the fungus in vitro growth. Treatments consisted of different concentrations of pyrolignous oil, neem oil, monosodium glutamate, sewage sludge and organic compost [coffee residue (50%) coal residue (10%), maize residue (25%), poultry waste (12.5%), poultry meal (2.5%)]. Positive control consisted of Petri dishes with PDA medium and negative control treatment consisted of PDA medium with procymidone. Fungus colonies were incubated at 22ºC and light intensity of 260 lux. Variables such as mycelium growth rate, sclerotia production, and...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Azadirachta indica; Sclerotinia white rot; Alternative control; Sewage sludge; Soil respiration.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000200014

Height-diameter relationships of tropical Atlantic moist forest trees in southeastern Brazil
Provedor de dados: 63
Autores: Scaranello,Marcos Augusto da Silva; Alves,Luciana Ferreira; Vieira,Simone Aparecida; Camargo,Plinio Barbosa de; Joly,Carlos Alfredo; Martinelli,Luiz Antônio.
Site-specific height-diameter models may be used to improve biomass estimates for forest inventories where only diameter at breast height (DBH) measurements are available. In this study, we fit height-diameter models for vegetation types of a tropical Atlantic forest using field measurements of height across plots along an altitudinal gradient. To fit height-diameter models, we sampled trees by DBH class and measured tree height within 13 one-hectare permanent plots established at four altitude classes. To select the best model we tested the performance of 11 height-diameter models using the Akaike Information Criterion (AIC). The Weibull and Chapman-Richards height-diameter models performed better than other models, and regional site-specific models...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Tree height; Elevation.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162012000100005

Occurence and biological aspects of the clitoria tree psyllid in Brazil
Provedor de dados: 63
Autores: Gondim Junior,Manoel Guedes Corrêa; Barros,Reginaldo; Silva,Fernando Rodrigues da; Vasconcelos,Geraldo José Nascimento de.
Clitoria fairchildiana (Howard) is a tree largely distributed in Brazil, used for urban arborization. In April 2001, the psyllid Euphalerus clitoriae Burckhardt &amp;amp; Guajará was reported on this plant in the metropolitan areas of Recife, PE, Brazil. This report records the occurrence of E. clitoriae and studies some of its biological aspects in this area. With this purpose, C. fairchildiana leaves were sampled weekly, and E. clitoriae nymphs as well as Aprostocetus sp. larvae and nymphs were collected and counted. The E. clitoriae population ranged from 2 to 90 nymphs per leaflet. The Aprostocetus sp. percentage of parasitism ranged from 3 to 24%. The frequency curve for pygidium width ranged from 120 to 140; 200 to 240; 300 to 380; 460 to 580, and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Euphalerus clitoriae; Psyllidae; Biology; Biological control; Natural enemies.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000300012

Soil management and nitrogen fertilization for sprinkler-irrigated upland rice cultivars
Provedor de dados: 63
Autores: Arf,Orivaldo; Rodrigues,Ricardo Antonio Ferreira; Crusciol,Carlos Alexandre Costa; Sá,Marco Eustáquio de; Buzetti,Salatiér.
The use of sprinkler irrigation for rice (Oryza sativa L.) crop is a relatively recent practice in Brazil. Therefore, crop soil and fertilization management are still not very well defined. Another problem is the inexistence of specific cultivars adapted to this cropping system. This study aimed to evaluate sprinkler-irrigated upland rice cultivars under different soil management practices and nitrogen sidedressing rates in relation to yield and grain quality. A randomized block design was used, arranged as a 3 x 3 x 5 factorial scheme, totaling 45 treatments consisting of the combination of three rice cultivars (Primavera, Confiança and Maravilha), three soil management systems (disk harrow + levelling harrow, moldboard plow + levelling harrow and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Oryza sativa L; Yield components; Moldboard plow; Harrow; No-till.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000200020

Absorção de magnésio por raízes destacadas de cultivares de tomateiro
Provedor de dados: 63
Autores: Sacramento,Luis Vitor S. do; Martinez,Herminia Emilia P.; Monnerat,Pedro Henrique; Oliveira,Laede Maffia de.
Estudou-se a absorção de magnésio por raízes destacadas de quatro cultivares de tomateiro (Lycopersicon esculentum Mill) em concentrações externas crescentes do elemento, entre 0,06 e 0,41 mmol.L-1. As velocidades máximas de absorção estimadas (Vmáx) foram 4,50; 4,31; 3,93 e 3,42 &lt;FONT FACE="Symbol"&gt;m&lt;/font&gt;mol.g-1. 40 min-1 para as cultivares Kadá, Yokota, Miguel Pereira e Ângela Hiper, respectivamente, e os valores de Km estimados foram 0,43; 0,35; 0,23 e 0,22 &lt;FONT FACE="Symbol"&gt;m&lt;/font&gt;mol.L-1, nessa mesma ordem. Com base nas estimativas de Km concluiu-se que os cultivares Ângela Hiper e Miguel Pereira apresentaram carregadores com maior afinidade pelo íon Mg2+ que os cultivares Yokota e Kadá. As Vmáx indicam, entretanto, que...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lycopersicon esculentum; Tomateiro; Magnésio; Raízes destacadas; Absorção.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000300001

Modelo matemático para estimar o acúmulo de matéria seca e prever as épocas do florescimento e do ponto de maturidade fisiológica da cultura de feijão
Provedor de dados: 63
Autores: Pimenta,Hudson Santos; Fancelli,Antônio Luiz; Dourado-Neto,Durval.
Com o objetivo de elaborar um modelo matemático para estimar o acúmulo de matéria seca, e prever as épocas de florescimento e do ponto de maturidade fisiológica da cultura de feijão, em função da temperatura média diária do ar, foi conduzido um experimento em Piracicaba-SP (22o42’30'’ de latitude Sul, 47o38’00'’ de longitude Oeste e 546 m de altitude) utilizando o cultivar IAC-Carioca sob dez tratamentos (diferentes níveis de nitrogênio e água). Em função dos resultados obtidos, verificou-se que o modelo sugerido é utilizável para o que foi proposto.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phaseolus vulgaris; Feijão; Florescimento; Maturidade fisiológica; Modelo matemático.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000400019

Yield and quality of sugar snap pea in the Ebro Valley: sowing date and seed density
Provedor de dados: 63
Autores: Azpilicueta,Miren; Irigoyen,Ignacio; Lasa,Berta; Muro,Julio; Aparicio-Tejo,Pedro M.
Sugar snap pea (Pisum sativum L. var. macrocarpon Ser.) is an edible-podded sweet pea that is being considered as a new totally mechanized crop to supply raw material to the agri-food industry of the Ebro Valley (Northern Spain). It is of great interest from an agronomic and commercial standpoint but neither its agronomic behaviour nor its adaptation to the area are known. The objective of this study was to determine the effect of sowing date and seed density on the growth and yield of the sugar snap pea at industrial scale. Six randomized blocks experiments with four replicates were conducted on irrigated land in Villafranca (Navarra, Spain) in 1998, 1999, and 2000. Three experiments for testing sowing dates (Mar., Apr., and May) and another three for...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pisum sativum; Edible pod; Heat sums; Industrial agriculture; New crops.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162012000500006

Heavy metals in Oxisols amended with biosolids and cropped with maize in a long-term experiment
Provedor de dados: 63
Autores: Oliveira,Katarzyna Wójcik; Melo,Wanderley José de; Pereira,Gener Tadeu; Melo,Valéria Peruca de; Melo,Gabriel Maurício Peruca de.
Biosolids comprise organic matter and plant nutrients, but are also a source of heavy metals hazardous to soils, plants and humans. The aim of this work was to evaluate accumulation, movement in the soil profile and availability to maize plants of heavy metals in two oxisols amended with biosolids for five years. The experiment was carried out in Jaboticabal, SP, Brazil, under field conditions, using a split-plot design. Biosolids were added to the soils at four different rates, 0.0 (control with mineral fertilization), 2.5; 5.0 and 10.0 t ha-1, dry weight basis, annualy for three years. In the fourth and fifth years, the 2.5 t ha-1 treatment rate was increased to 20.0 t ha-1. In the fifth year, soil samples were collected at 0-20 and 20-40 cm depths and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mehlich 1; Sewage sludge; Maize; Metal availability.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000400012

Linear programming model to optimize the water resource use in irrigation projects: an application to the Senator Nilo Coelho Project
Provedor de dados: 63
Autores: Frizzone,J.A.; Coelho,R.D.; Dourado-Neto,D.; Soliani,R.
The main objective of this paper was to develop a separable linear programming model, considering a set of technical factors which may influence the profit of an irrigation project The model presents an objective function that maximizes the net income and specifies the range of water availability. It is assumed that yield functions in response to water application are available for differents crops and describe very well the water-yield relationships. The linear programming model was developed genetically, so that, the rational use of the available water resource could be included in an irrigation project Specific equations were developed and applied in the irrigation project "Senator Nilo Coelho" (SNCP), located in Petrolina - Brazil Based on the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Irrigation; Linear programming model.
Ano: 1997
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161997000300016

Intercropping Acacia mangium stimulates AMF colonization and soil phosphatase activity in Eucalyptus grandis
Provedor de dados: 63
Autores: Bini,Daniel; Santos,Cristiane Alcantara dos; Silva,Mylenne Calcciolari Pinheiro da; Bonfim,Joice Andrade; Cardoso,Elke Jurandy Bran Nogueira.
ABSTRACT: Arbuscular mycorrhizal fungi (AMF) are very important to plant nutrition, mostly in terms of acquisition of P and micronutrients. While Acacia mangium is closely associated with AMF throughout the whole cycle, Eucalyptus grandis presents this symbiosis primarily at the seedling stage. The aim of this study was to evaluate the dynamics of AMF in these two tree species in both pure and mixed plantations during the first 20 months after planting. We evaluated the abundance, richness and diversity of AMF spores, the rate of AMF mycorrhizal root colonization, enzymatic activity and soil and litter C, N and P. There was an increase in AMF root colonization of E. grandis when intercropped with A. mangium as well as an increase in the activity of acid...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: AMF spores; Mycorrhiza; Mixed species; Soil enzymes; Phosphorus.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162018000200102

Épocas de semeadura e densidade de plantas de soja: I. Componentes da produção e rendimento de grãos
Provedor de dados: 63
Autores: Peixoto,Clovis Pereira; Câmara,Gil Miguel de Sousa; Martins,Mônica Cagnin; Marchiori,Luis Fernando Sanglade; Guerzoni,Rodrigo Ayusso; Mattiazzi,Patrícia.
Avaliou-se o desempenho produtivo de três cultivares de soja, pertencentes a diferentes ciclos de maturação, instalados em épocas de semeadura normal, tardia e safrinha. Cada época constituiu experimento individual delineado em blocos casualizados num fatorial 3 x 3 (três cultivares: IAC-12, IAC-17 e IAC-19; três densidades de plantas: 10, 20 e 30 plantas.m-1), com três repetições. Os componentes da produção, destinados à avaliação do rendimento, número total de vagens por planta e número total de grãos por planta, foram determinados em 10 plantas aleatórias na parcela útil. A massa de 1000 grãos e o rendimento de grãos foram determinados com base na população final de plantas na área útil de cada parcela. Concluiu-se que: os caracteres componentes do...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soja; Cultivar; Época de semeadura; Densidade; Rendimento.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000100015

Nonpreference of whitefly for oviposition in tomato genotypes
Provedor de dados: 63
Autores: Toscano,Luciana Cláudia; Boiça Jr.,Arlindo Leal; Maruyama,Wilson Itamar.
The silverleaf whitefly is one of most important pests of tomato (Lycopersicon spp.). The use of host plant resistance to control this insect is an interesting, potentially useful technique, but in demand of more research. The objectives of this work were to evaluate the oviposition non-preference of Bemisia tabaci (Gennadius, 1889) biotype B for different tomato plant genotypes, evaluating the correlation between oviposition preference and pubescence in the genotypes, and analyzing the abaxial and adaxial surfaces of Lycopersicon pennellii leaflets under the scanning electron microscope. Four wild tomato genotypes, LA 716 (L. pennellii); PI 127826 and PI 127827 (L. hirsutum); PI 134417 (L. hirsutum f. glabratum), and two commercial genotypes, Santa Clara...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lycopersicon spp.; Insecta; Bemisia tabaci biotype B; Plant resistance; Trichome.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000400009

Quality based payment program and milk quality in dairy cooperatives of Southern Brazil: an econometric analysis
Provedor de dados: 63
Autores: Botaro,Bruno Garcia; Gameiro,Augusto Hauber; Santos,Marcos Veiga dos.
Programs designed to enhance milk quality have been used to motivate dairy farmers to improve the quality of the raw milk they produce. The objective of this study was to evaluate the association between a milk quality payment program and four indicative variables of milk quality, by testing bulk tank somatic cell count (SCC), bulk tank total bacterial count (TBC), fat (FAT) and protein (PROT) percentages over three years in four dairy cooperatives in Southern Brazil. We used a multiple regression econometric model estimated from market data of milk delivered by farmers to the cooperatives. Bulk tank milk samples (n = 19,644) were monthly collected. The data set was analyzed for the effects of seasonality, average daily volume of milk, the award/penalty,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bacterial count; Somatic cell count; Premium payment; Milk composition; Milk production.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162013000100004

ESTUDO DA GERMINAÇÃO DE SEMENTES DE LAVANDA (Lavandula angustifolia Miller)
Provedor de dados: 63
Autores: AOYAMA,E.M.; ONO,E.O.; FURLAN,M.R.
Com o objetivo de estudar os efeitos do ácido giberélico, do efeito luz/escuro e do pré-resfriamento sobre a germinação de sementes de lavanda (Lavandula angustifolia Miller), empregou-se o delineamento experimental inteiramente casualizado, com cinco repetições de 30 sementes cada, e os seguintes tratamentos: testemunha; GA3 100 ppm; GA3 200 ppm; escuro; GA3 100 e 200 ppm + 48 h de pré-resfriamento e GA3 100 e 200 ppm + 7 dias de pré-resfriamento. As sementes de lavanda foram pré-embebidas por 18 horas nas soluções de GA3 e em água destilada e depois colocadas em gerbox, com papel de filtro umedecido com água destilada. Nos tratamentos com pré-resfriamento as sementes foram mantidas em câmara fria por 48 horas e 7 dias à temperatura de 5° C;...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Germinação; Ácido giberélico; Sementes; Lavandula angustifolia.
Ano: 1996
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161996000200013

Tratamento térmico do leite acondicionado em filme plástico em banho-maria
Provedor de dados: 63
Autores: Oliveira,AJ.de; Gallo,C.R.; Carvalho,C.M.de.
O presente trabalho foi realizado com a finalidade de se conseguir um procedimento de pasteurização prático e de baixo custo para pequenos produtores de leite, assegurando assim um aumento do tempo de conservação e consequentemente de comercialização do produto, sem riscos para o consumidor. Para tal, amostras de leite já acondicionadas em filme plástico (l litro) foram submetidas a diferentes tratamentos térmicos, sempre utilizando-se banho-maria a 70 ± 1,0°C e variando-se os tempos de exposição. Os resultados obtidos se mostraram satisfatórios sob o ponto de vista físico-químico e microbiológico, reduzindo drasticamente em pouco tempo de exposição a população microbiana e eliminando totalmente as bactérias coliformes totais e fecais presentes no leite cru.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Leite; Bactéria; Coliformes; Tratamento térmico.
Ano: 1994
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000100025

Mixed effect models for predicting breast height diameter from stump diameter of Oriental beech in Göldağ
Provedor de dados: 63
Autores: Ercanli,Ilker; Gunlu,Alkan; Başkent,Emin Zeki.
Diameter at breast height (DBH) is the simplest, most common and most important tree dimension in forest inventory and is closely correlated with wood volume, height and biomass. In this study, a number of linear and nonlinear models predicting diameter at breast height from stump diameter were developed and evaluated for Oriental beech (Fagus orientalisLipsky) stands located in the forest region of Ayancık, in the northeast of Turkey. A set of 1,501 pairs of diameter at breast height-stump measurements, originating from 70 sample plots of even-aged Oriental beech stands, were used in this study. About 80 % of the otal data (1,160 trees in 55 sample plots) was used to fit a number of linear and nonlinear model parameters; the remaining 341 trees in 15...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: DBH; Prediction; Random parameters; Calibration.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162015000300245

Seed technology training in the year 2000
Provedor de dados: 63
Autores: McDonald,M.B.; Marcos-Filho,J.; Bino,R.J.
Seed quality will remain the centerpiece of successful agricultural programs in the year 2000. As new changes occur in agriculture driven by advancements in biotechnology, seed enhancement technologies, a more diverse seed user clientele, and communication technologies, successful seed companies will require a knowledgeable and informed workforce to assure high seed quality. A new approach to seed technology training is professed that relies on the establishment of a three-institution consortium to achieve this objective. Advantages of the consortium are identified that emphasize the unique strengths of each institution, their geographic advantages representing major climactic/agricultural zones in the world, and differing approaches to seed technology...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Seed quality; Education; Seed industry; Biotechnology; Seed enhancements; Consortium.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000500001

Alocação de água e combinação de atividades pela programação linear em um projeto hidroagrícola no município de Guaíra (SP)
Provedor de dados: 63
Autores: Frizzone,J.A.; Botrel,T.A.; Arce,R.A.B.; Péres,F.C.
Com o objetivo de desenvolver um modelo de programação linear para simular os níveis das atividades do processo de produção, utilizou-se o sistema de produção da fazenda Lagoa do Fogão, propriedade da família Sakai, localizada no município de Guaíra,SP, com um total de 207 ha irrigados por três sistemas de irrigação do tipo pivô-central. A função objetivo consistiu em maximizar o lucro da propriedade agrícola, utilizando as culturas de inverno tradicionalmente cultivadas nessa propriedade, sob regime de irrigação, a saber: tomate industrial, trigo, batata, ervilha e feijão. As restrições foram quanto à disponibilidade de terra, água e mercado. Os resultados obtidos, permitiram as seguintes conclusões: (a) na área sob o pivô-central 1 deve-se cultivar...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Programação linear; Alocação de água; Pivô-central.
Ano: 1994
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000300026

Heavy metals extractability in a soil amended with sewage sludge
Provedor de dados: 63
Autores: Marchi,Giuliano; Guilherme,Luiz Roberto Guimarães; Chang,Andrew C.; Nascimento,Clístenes Williams Araújo do.
Few investigations have been carried out about the comparison of desorption rate and amount of heavy metals extracted successively by organic acid mixtures mimicking the rhizosphere and routine extractants in sewage sludge-amended soils. Extractions of Zn, Cd, Ni, Cr, and Cu were performed in samples of a sewage sludge-amended soil using seven extractants: four organic acid mixtures and three routine extractants (DTPA, Mehlich-I, and ammonium acetate). Results from single pass extractions, in which the extractable metal contents were determined by simply extracting the soil a single time, as well as from 15 successive extractions, in which the solid residues of the first extraction was successively extracted 14 additional times, of heavy metals were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Oxisol; Extraction rate; Trace elements.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000500009

Sediment morphology and distribution in a restored riparian forest
Provedor de dados: 63
Autores: Momoli,Renata Santos; Cooper,Miguel; Castilho,Selene Cristina de Pierri.
Sediment distribution patterns of riparian zones reflect the deposition dynamics and the type of deposition event. The purpose of this study is to characterize the morphology and distribution of sediments deposited in a restored riparian forest that were transported from adjacent areas cropped with sugar-cane. In order to study the deposition processes in a riparian forest located in the county of Iracemápolis state of São Paulo, Brazil, soil samples were collected on a transect for micromorphological as well as particle size distribution analyses, using Folk &amp;amp; Ward statistical parameters. Soil samples were dispersed with NaOH + sodium hexametaphosphate and water. The dispersion in water was made to simulate field transport conditions. Particle...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Deposition; Particle size distribution; Image analysis.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000500006

Estimativa do consumo de água na cultura da cenoura (Daucus carota, L.) v. nantes superior, para a região de piracicaba, através do método do balanço hídrico
Provedor de dados: 63
Autores: Moura,M.V.T.; Marques Júnior,S.; Botrel,T.A.; Frizone,J.A.
O presente trabalho teve como objetivo estimar a demanda hídrica da cultura da cenoura (Daucus carota, L.) cv. Nantes Superior, pelo método do balanço hídrico sob condições de campo, para a região de Piracicaba, Estado de São Paulo (22° 42' 30" S; 47° 30' 00" W, à 560 metros de altitude). Os valores de evapotranspiração máxima obtidos pelo método do balanço hídrico foram correlacionados com os valores de evapotranspiração de referência estimados pelo método de Penman, objetivando a determinação do coeficiente de cultura. O consumo total de água considerando-se um ciclo vegetativo de 101 dias foi de 365 mm, gerando um consumo médio de 3,61 mm/dia. Nesta situação, o coeficiente de cultura médio encontrado foi de 1,1.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cenoura; Consumo de água; Balanço hídrico.
Ano: 1994
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000200014

Reducing supplementation frequency for Nellore beef steers grazing tropical pastures
Provedor de dados: 63
Autores: Canesin,Roberta Carrilho; Berchielli,Telma Teresinha; Vega,Antonio de; Reis,Ricardo Andrade; Messana,Juliana Duarte; Baldi,Fernando; Páscoa,Adriano Gomes.
Reduced supplementation frequency is a broadly applied management practice. Ruminants consuming low quality forages/pastures, supplemented less than once daily are able to maintain body weight gain (BWG), efficiency of use of dry matter, nitrogen and other nutrients, as compared with animals supplemented once daily. We evaluated the feeding behavior, dry matter intake (DMI), dry matter and organic matter digestibility (DMD and OMD), BWG, Longissimus muscle area and backfat depth of Nellore steers raised on Brachiaria brizantha cv. Marandu pastures during the dry season, with different supplementation patterns. Thirty six animals (338 ± 40.7 kg) were distributed over nine paddocks according to a completely randomized design. Treatments were based on...
Tipo: Info:eu-repo/semantics/article
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162014000200003

Rootstock on vine performance and wine quality of ‘Syrah’ under double pruning management
Provedor de dados: 63
Autores: Dias,Frederico Alcântara Novelli; Mota,Renata Vieira da; Souza,Claudia Rita de; Pimentel,Rodrigo Meirelles de Azevedo; Souza,Laís Cristina de; Souza,André Luiz de; Regina,Murillo de Albuquerque.
ABSTRACT In the Brazilian Southeast, the production of high quality wines is attained by a new management approach called double pruning. This management changes the harvesting of wine grape (Vitis vinifera L.) from wet summer to dry winter through a two pruning procedures carried out during the year. The first pruning is done during the winter to induce a vegetative cycle (all clusters are removed) and a second pruning is done during the summer to induce the reproductive cycle. In this study, ten different rootstocks were compared in order to optimize yield and wine quality of Syrah vines conducted under autumn-winter season by double pruning approach. Syrah grapevines grafted onto ‘Rupestris du Lot’ and ‘IAC 766’ showed the highest pruning weight, while...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vitis vinifera; Autumn-winter season; Vigor; Yield; Berry quality.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162017000200134

Spatial and temporal characterization of water and solute distribution patterns
Provedor de dados: 63
Autores: Souza,Claudinei Fonseca; Folegatti,Marcos Vinícius.
The use of drip irrigation and marginal water is growing rapidly in some areas, highlighting the need to develop sound fertigation practices that combine environmental and crop production concerns. In this study the spatial and temporal water and solute distribution patterns are characterized to underpin fertirrigation design and management systems. Time domain reflectometry (TDR) probes were used to monitor the distributions of potassium nitrate (KNO3) and water from drippers discharging at a constant flow rate of 4 L h-1 in soil-filled containers. In the interactions between the different profiles, a gradient distribution of the solution in the soil was observed, with greater storage of solution close to the dripper, which decreased gradually as it...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: TDR; Drip irrigation; Wetted soil volume.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000100002

Growth and yield of papaya under irrigation
Provedor de dados: 63
Autores: Almeida,Frederico Terra de; Bernardo,Salassier; Sousa,Elias Fernandes de; Marin,Sérgio Lúcio David; Grippa,Sidney.
Thermal units or degree day systems can both be used to quantify relationships between plants and air temperature. The Northern Fluminense region holds no tradition for irrigated papaya (Carica papaya L.) cropping and, because of the need for irrigation, it is important knowing its growth and development characteristics under these conditions. This study aimed to determine the relationship between growth rate of papaya plants and degree days, and its effect on crop productivity, under different irrigation levels. An experiment was set up with the cultivar "Improved Sunrise Soil 72/12", in a randomized blocks design, with seven irrigation water depths and three repetitions; crop growth and yield parameters were evaluated. There were significant correlations...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Irrigation management; Development; Papaya; Productivity.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000300001

Inflection and stability points of diphasic logistic analysis of growth
Provedor de dados: 63
Autores: Mischan,Martha Maria; Passos,José Raimundo de Souza; Pinho,Sheila Zambello de; Carvalho,Lídia Raquel de.
Growth functions with inflection points following a diphasic model, can be adjusted by two approaches using segmented regression or the sum of two functions. In both cases, there are two functions, one for each phase, with inflection and stability points. However, when they are summed, the result is a new function and the points of inflection and stability are different from those obtained from using each function individually. A method to determine these points in a diphasic logistics sum of functions is suggested and the results obtained from fitting the models to eucalyptus growth data showed a better fit of the logistic diphasic sum as compared with segmented regression and monophasic logistic models.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nonlinear models; Segmented regression; Sum of logistics.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162015000300215

Hanging the beef carcass by the forequarter to improve tenderness of the Longissimus dorsi and Biceps femoris muscles
Provedor de dados: 63
Autores: Luchiari Filho,Albino; Macedo,Renato Prates; Pereira,Angélica Simone Cravo; Silva,Saulo da Luz e; Leme,Paulo Roberto; Feitosa,Guilherme.
Hanging beef carcasses in different configurations in the cooler affect some carcass muscle tenderness. Forty Nellore steer carcasses (ten per day) were chosen at random in a federally inspected slaughter plant and hanged alternate left and right sides either in the traditional way by the hindquarter (HQ) or by the forequarter (FQ) also called "tenderbife". Carcasses were selected from steers up to 30 months old and had an average hot carcass weight of 244.1 kg. These carcasses were chilled for 48 hours, when samples from the Longissimus dorsi (LD) at the 12th rib and the Biceps femoris (BF) at the P8 site were removed, kept under refrigeration (0-2ºC) for five days and frozen for future analysis. The temperature of the LD after 24 hours taken at the 12th...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Beef cattle; Carcass suspension; Meat quality; Tenderness.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000500013

Plant bioassays to assess toxicity of textile sludge compost
Provedor de dados: 63
Autores: Araújo,Ademir Sérgio Ferreira; Monteiro,Regina Teresa Rosim.
Composting of industrial wastes is increasing because of recycling requirements set on organic wastes. The evaluation of toxicity of these wastes by biological testing is therefore extremely important for screening the suitability of waste for land application. The toxicity of a textile sludge compost was investigated using seed germination and plant growth bioassays using soybean and wheat. Compost samples were mixed with water (seed germination bioassay) or nutrient solution (plant growth bioassay) at concentrations of 0, 19, 38, 76 and 152 g L-1. No negative effects were observed after five days of compost water-extract in relation to soybean and wheat seed germination. After fifteen days, under a hydroponics system, plant growth had harmful effects of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phytotoxicity; Seed germination; Solid residue; Hydroponics.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000300013

Coping with climate risk in agriculture needs farmer oriented research and extension policies
Provedor de dados: 63
Autores: Stigter,Kees.
The first necessary change for agrometeorology, in generally lower (external) input parts of agriculture in developing countries, is on research and extension. They have to refocus to preparedness for risks and uncertainties of local farming systems in need of support in four defined directions of prioritization, emphasis depending on the farming system concerned. These are (i) extreme events and their consequences caused by meteorological and climatological disasters on all time scales, including related aversion attempts; (ii) pests and diseases, including countervailing measures; (iii) trying to use beneficial climate and weather and (iv) applications of agrometeorological services. The second necessary change for such agrometeorology is participation...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Climate Field Schools; Agrometeorological services; Participation; Preparedness; Resilience.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000700016

Addition of proteic nitrogen during alcoholic fermentation for the production of cachaça
Provedor de dados: 63
Autores: Jeronimo,Elisangela Marques; Oliveira,Evelyn de Souza; Souza,Elson Luíz Rocha; Silva,Marcelo de Almeida; Serra,Gil Eduardo.
Cachaça is the denomination of a typical and exclusive Brazilian spirit produced from the distillation of fermented sugarcane juice must. The objective of this study was to evaluate the effect of adding yeast extract to the sugarcane juice used for sugarcane liquor production, because for the artisanal process no studies are available on nitrogen addition nor beverage quality, involving nitrogen complementation. Results of previous studies in the laboratory scale showed that sugarcane juice complementation with proteic nitrogen can be a beneficial practice for yeast multiplication and cellular growth, and also for the improvement of fermentation yield and liquor productivity. In this pilot scale study, using recycled yeast, the addition of proteic nitrogen...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Yeast extract; Cell viability; Volatile compounds; Sensory analysis.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000200009

The risk of erosion in Brazilian cultivated pastures
Provedor de dados: 63
Autores: Sparovek,Gerd; Correchel,Vladia; Barretto,Alberto G.O. Pereira.
Pastures are normally associated with minor erosion problems because of their efficient soil cover. Soil cover is without doubt the most effective inter-rill and rill erosion control practice. However, considering the frequency at which pastures are replanted in Brazil and their enormous territorial extension (178 million hectares) we identify that extensive areas, usually covered by pastures, will remain bare, intensively tilled, and without complementary mechanical soil control practices. The pasture area is equivalent to that occupied by most important Brazilian annual crops (corn or soybeans), that are usually cultivated under no-tillage or supported by governmental soil conservation programs. The precise assessment of these impacts, caused by the...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Environmental impact; Soil conservation research.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000100012

Desenvolvimento vegetativo do pepino enxertado irrigado com água salina
Provedor de dados: 63
Autores: Folegatti,Marcos Vinícius; Blanco,Flávio Favaro.
A salinização dos solos em ambiente protegido devido ao excesso de fertilizantes e falta de lixiviação tem resultado na redução da produtividade das culturas. Este trabalho teve o objetivo de avaliar os efeitos da irrigação com água salina no desenvolvimento vegetativo do pepino enxertado cultivado em ambiente protegido. Foram utilizadas águas de diferentes salinidades (S1=1,58; S2=3,08 e S3=5,13 dS m-1), lâminas de água de irrigação (L0=1,00 x ETc e L1=1,25 x ETc) e freqüências de aplicação da lâmina L1 (F1=em todas as irrigações e F2=quando a lâmina de água de irrigação acumulada em L0 atingia 100 mm). Os resultados demonstraram que a altura das plantas, área foliar unitária e índice de área foliar foram afetados linearmente pela salinidade da água, não...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cucumis sativus; Irrigação; Salinidade; Desenvolvimento vegetativo.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000300013

Co2 and irrigation in relation to yield and water use of the bell pepper crop
Provedor de dados: 63
Autores: Rezende,Fátima Conceição; Frizzone,José Antonio; Oliveira,Ricardo Ferraz de; Pereira,Anderson Soares.
Greenhouse production of vegetables is widely used throughout the world. Elevated carbon dioxide (CO2) concentrations in these closed environments can increase net photosynthesis and yield. The objective of this study was to determine the effects of atmospheric CO2 enrichment and water supply on the growth of potted bell pepper (Capsicum annuum L.) plants, cultivated under controlled environmental conditions. CO2 was applied daily, and its distribution was monitored above plant rows through micro pipes located at 3.0 m height. A drip irrigation system with one dripper per plant was used to irrigate the plants. Different volumes of irrigation water, representing fractions of the water volume (Vet) consumed by pot plants growing under no water stress...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fruit mass; Number of fruits; Water use efficiency.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000100002

Rendimento e qualidade de frutos de pimentão cultivado em ambiente protegido em função do nitrogênio e potássio aplicados em cobertura
Provedor de dados: 63
Autores: Silva,Maria Anita Gonçalves da; Boaretto,Antonio Enedi; Melo,Arlete Marchi Tavares de; Fernandes,Henriqueta M. Gimenes; Scivittaro,Walkyria Bueno.
O objetivo deste trabalho foi avaliar o efeito do N e K2O na produtividade e rendimento do pimentão, em função de características de crescimento dos frutos (peso, comprimento e diâmetro) e do número total de frutos por planta e por área. Os tratamentos foram aplicados sob condições de ambiente protegido, ao lado da linha de plantas e parcelados em 6 vezes, utilizando-se a cultivar Mayata. O experimento foi conduzido de novembro/96 a agosto/97 e constou dos seguintes tratamentos: controle e as combinações de 3 doses de N (13,3; 26,6 e 39,9 g m-2) e 3 doses de K2O (13,3; 26,6 e 39,9 g m-2). O delineamento experimental adotado foi o de blocos ao acaso, em esquema fatorial (3 x 3 +1), com 4 repetições, totalizando 40 parcelas. Cada parcela foi composta de 11...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Capsicum annuum; Nitrogênio; Potássio; Adubação; Rendimento; Pimentão.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000500023

Reduction of sodium content in pork coppa: physicochemical, microbiological and sensory evaluation
Provedor de dados: 63
Autores: Domenico,Jocasta Di; Machado-Lunkes,Alessandra; Prado,Naimara Vieira; Weber,Cleusa Inês; Lucchetta,Luciano.
ABSTRACT: Sodium reduction and the substitution of sodium chloride by other salts have been extensively studied in order to produce healthier foods. Coppa is a pork cured product that receives high levels of sodium through the salting process. The objective of this work was to evaluate the impact of reductions in Sodium Chloride (NaCl), substitution by Potassium Chloride (KCl) and reductions in the re-salting time on the physicochemical, microbiological and sensorial characteristics in pork coppa. Four treatments were applied: T1 with 2 days of salting, 2 days of re-salting and 35 % reduction of NaCl; T2 with 2 days of salting and 3 days of re-salting and 35 % reduction of NaCl; T3 with 2 days of salting and 2 days of re-salting and replacing 35 % of NaCl...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: NaCl replacement; Potassium Chloride; Sodium reduction; Sensory analysis.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000600902

Dairy cow monitoring by RFID
Provedor de dados: 63
Autores: Stankovski,Stevan; Ostojic,Gordana; Senk,Ivana; Rakic-Skokovic,Marija; Trivunovic,Snezana; Kucevic,Denis.
Dairy cows identification and monitoring on small cattle farms are usually based on the utilization of barcode technology. This kind of identification technology is unsuitable for dairy cows milking and feeding process automation. Radio Frequency Identification (RFID) technology is a better solution in this case. This paper describes the research and implementation of the milking cycle´s automated monitoring with the use of RFID tags conducted on a small cattle farm in the Republic of Serbia. This solution is based on RFID system which consists of two parts. First part includes control box, two Ultra High Frequency (UHF) RFID readers operating at frequency of 915 MHz and RFID tags glued onto the dairy cow ear labels. Second part includes software modules...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Identification technology; Automatic scanning; Cattle farm; Milk yield.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162012000100011

Estimativa da porosidade drenável de um solo de várzea a partir da tensão da água no solo
Provedor de dados: 63
Autores: Queiroz,J.E.; Cruciani,D.E.; Libardi,P.L.
Um modo alternativo para estimativa da porosidade drenável em função da tensão da água no solo a partir da equação de VAN GENUCHTEN para a curva de retenção, é apresentado e testado para dados obtidos de um solo de várzea ( Gleissolo Eutrófico, textura argilosa). Curvas de retenção de água foram elaboradas com amostras de solo com estrutura indeformada. Na análise dos resultados verificou-se que o maior componente de erro foi devido a causas aleatórias, representando cerca de 12 vezes o erro sistemático. Os índices estatísticos utilizados para verificar o grau de ajuste dos dados experimentais à relação funcional apresentada entre porosidade drenável e tensão de água no solo, mostraram que esta relação pode ser utilizada para estimativa da porosidade...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Porosidade drenável; Curva de retenção; Parâmetros empíricos.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000300011

Meta-analysis of individual and combined effects of mycotoxins on growing pigs
Provedor de dados: 63
Autores: Andretta,Ines; Kipper,Marcos; Hauschild,Luciano; Lehnen,Cheila Roberta; Remus,Aline; Melchior,Raquel.
ABSTRACT Little is known about the toxicity of concomitantly occurring mycotoxins in pig diets. This study was conducted to evaluate, through meta-analysis, the individual and the combined effects of mycotoxins on pig performance. The meta-analysis followed three sequential analyses (graphical, correlation, and variance-covariance) based on a database composed of 85 published papers, 1,012 treatments and 13,196 animals. Contamination of diets with individual mycotoxins reduced (p &lt; 0.05) feed intake by 14 % and weight gain by 17 %, while combined mycotoxins reduced the same responses by 42 % and 45 %, respectively, in comparison with the non-challenged group. The correlation (p &lt; 0.05) between reduction in weight gain (ΔG) and reduction in feed...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Modelling; Sanitary challenge; Swine; Toxicology.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000400328

Meiotic behavior in apomictic Brachiaria ruziziensis × B. brizantha (Poaceae) progenies
Provedor de dados: 63
Autores: Fuzinatto,Veridiana Aparecida; Pagliarini,Maria Suely; Valle,Cacilda Borges do.
Hybrids combining desirable traits from divergent parents are the main objective of some Brachiaria (Syn. Urochloa P. Beauv.) breeding programs. There is great interest in the development of apomictic hybrid cultivars that combine desirable genes such as resistance to spittlebugs, high nutritive value, and tolerance to acid soils. Microsporogenesis of six apomictic progenies resulting from a tetraploid (2n = 4x = 36) cross between B. ruziziensis × B. brizantha was evaluated under light microscopy. Genetic recombination, ensured by multivalent chromosome association and crossing-over at prophase occurred in low frequency among progenies, and in one, recombination was almost nonexistent. The percentage of meiocytes with meiotic abnormalities among progenies...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brachiaria; Microsporogenesis; Breeding; Pastures; Apomixis.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162012000600006

Crescimento em vasos, de cultivares de soja e de trigo em função da saturação de alumínio
Provedor de dados: 63
Autores: Mascarenhas,H.A.A.; Tanaka,R.T.
Um dos problemas que a acidez do solo causa às plantas é concentrar alguns elementos químicos em nível tóxico, como por exemplo de alumínio (Al) e manganês. Visando estudar esse aspecto, foi conduzido um experimento em casa de vegetação, utilizando-se amostra de subsolo, classificado como Latossolo Vermelho Amarelo fase rasa, de extrema acidez e alto teor de Al trocáveL A acidez do substrato foi neutralizada com doses de hidróxido de cálcio, no intuito de reduzir a saturação de Al originalmente de 67 para 45, 30, e 15%. As incubações e os cultivos foram feitos em vasos contendo 6 kg daquele subsolo. Inicialmente foi testada a soja variedades Biloxi, Davis e Santa Rosa, com medições de: altura das plantas, número de nós, tamanho dos internódios, número de...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Matéria seca; Soja; Saturação de alumínio; Tolerante.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000200009

Hillslope curvature, clay mineralogy, and phosphorus adsorption in an Alfisol cultivated with sugarcane
Provedor de dados: 63
Autores: Barbieri,Diogo Mazza; Marques Júnior,José; Alleoni,Luis Reynaldo Ferracciú; Garbuio,Fernando José; Camargo,Livia Arantes.
Hillslope curvatures are associated with specific environments that correlate to chemical and mineralogical attributes of soil, so determining specific management zones. Phosphorus is one of the main limiting factors to the development and longevity of sugarcane. The type and the mineralogical constitution of the clay fraction play an important role in the phosphorus (P) adsorption of soil. High proportion of gibbsite (Gb) in soil may be the major responsible for P adsorption. The relationships among spatial variability as a function of hillslope curvature, the proportion of kaolinite (Kt) and Gb, and phosphorus adsorption were evaluated in an Alfisol cultivated with sugarcane. Two plots of 1 ha of a concave and a convex hillslope area were selected and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brazil; Gibbsite; Kaolinite available phosphorus; Geostatistics; Soil-landscape relationships.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000600015

Aspectos econômicos da adubação fosfatada para cultura do milho
Provedor de dados: 63
Autores: Prado,Renato de Mello; Fernandes,Francisco Maximino.
Estudos econômicos da adubação fosfatada fazem-se necessários, em razão da sua participação expressiva no custo de produção da cultura do milho, especialmente em solos sob vegetação de cerrado e face à competitividade da atividade no mercado globalizado. Assim, objetivou-se avaliar alguns aspectos econômicos de modos de aplicação da adubação fosfatada a lanço e sulco simples comparados ao modo alternativo em sulco duplo, utilizando o híbrido de milho BR 3123. Os tratamentos foram constituídos pelos modos de aplicação em sulco duplo, sulco simples e a lanço nas doses: 0; 0,50; 0,75; 1,00; 1,25; 1,50 vez a dose recomendada para adubação de manutenção para o milho, ou seja, 90 kg de P2O5 ha-1. Para a análise, considerou-se o preço médio da década de 90 para a...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Zea mays; Superfosfato triplo; Fósforo; Benefício/custo; Rentabilidade.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000300027

Impact of feeding cottonseed coproducts on reproductive system of male sheep during peripubertal period
Provedor de dados: 63
Autores: Paim,Tiago do Prado; Viana,Pauline; Brandão,Eduardo; Amador,Samara; Barbosa,Tatiana; Cardoso,Caio; Lucci,Carolina Madeira; Souza,Jurandir Rodrigues de; McManus,Concepta; Abdalla,Adibe Luiz; Louvandini,Helder.
ABSTRACT Cottonseed coproducts contain gossypol which can have specific effects upon the male reproductive system. We evaluated the reproductive development of male lambs close to puberty fed on three cotton coproducts. Twenty-four 5-month old male lambs received four diets: 20 % of dry matter intake of whole cottonseed (WCS), high oil cottonseed meal (CSC), cottonseed meal (CSM), and a control group (CTL) without any cottonseed coproducts. Free gossypol intake was 16.32, 6.98, 5.47 and 0 mg kg−1 BW−1 d−1 for WCS, CSC, CSM and CTL, respectively. Every 15 days, the animals were weighted and serum and semen samples were collected. After 95 days, testis samples were collected for analysis under light and transmission electron microscopes. The CTL group had...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gossypol; Sperm; Testis; Testosterone; Lamb.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000600489

Germination of cotton cultivar seeds under water stress induced by polyethyleneglycol-6000
Provedor de dados: 63
Autores: Meneses,Carlos Henrique Salvino Gadelha; Bruno,Riselane de Lucena Alcântara; Fernandes,Pedro Dantas; Pereira,Walter Esfrain; Lima,Leonardo Henrique Guedes de Morais; Lima,Marleide Magalhães de Andrade; Vidal,Márcia Soares.
The physiological quality of cotton cultivar seeds (Gossypium hirsutum var. latifolium L.) was evaluated in laboratory by the simulation of water potentials with polyethyleneglycol-6000 (0.0; -0.2; -0.4; -0.6; -0.8 and -1.0 MPa), at 25ºC using germitest paper as substrate. A completely randomized design in a 4 × 6 factorial scheme with four replications of 50 seeds each was used. The studied variables were: germination percentage, first count of germination, germination velocity index, accelerated aging in water, electrical conductivity, humidity, vigor classification, radicle length and radicle/shoot length ratio. The effect of water stress on seed viability and on plantlet vigor was severe at potentials below -0.4 MPa. The 'CNPA 187 8H' cultivar was the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gossypium hirsutum var. latifolium L.; PEG-6000; Vigor; Water potential.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000200001

Traça Tuta absoluta (Meyrick) em cultivares de tomateiro tratadas com extratos aquosos de Trichilia pallida Swartz
Provedor de dados: 63
Autores: Vendramim,José Djair; Thomazini,Ariane Paes de Barros Werckmeister.
A traça Tuta absoluta (Meyrick) é atualmente uma das principais pragas do tomateiro no Brasil. Com o objetivo de obter um método de controle eficiente e não poluente, avaliou-se a atividade dos extratos aquosos de folhas e ramos de Trichilia pallida Swartz associados a duas cultivares de tomateiro (Santa Clara e IPA-5) sobre essa praga. Acompanhou-se o desenvolvimento do inseto em folhas de cada uma das cultivares previamente submersas nos extratos a 1% de concentração, avaliando-se a duração e viabilidade das fases larval e pupal e o peso de pupas. A cultivar IPA-5 provocou alongamento da fase larval e, quando associada aos extratos de folhas e de ramos, reduziu a viabilidade pupal do inseto. Os extratos de folhas e de ramos também alongaram o período...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Lycopersicon esculentum; Trichilia pallida; Traça-do-tomateiro; Planta inseticida; Resistência de plantas.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000300025

Aspectos biológicos de adultos de um parasitóide do bicudo do algodoeiro
Provedor de dados: 63
Autores: Araújo,Lúcia Helena Avelino; Braga Sobrinho,Raimundo; Queiroz,Messias Firmino de.
Bracon sp. é um importante agente de controle biológico de Anthonomus grandis (Boheman). Estudaram-se em laboratório, aspectos biológicos de Bracon sp., utilizando-se como hospedeiro larva do bicudo do algodoeiro, a temperatura de 26 ± 2oC, 70 ± 5% UR e fotofase de 12 horas. O ciclo biológico de Bracon sp. teve duração média de 11,7 dias, o período de incubação de 1 dia, o período médio larval de 3,9 dias, com 4 estádios; a viabilidade larval de 98,7%, o período pré-pupal de 0,6 dia, o período pupal de 6,2 dias, o tempo de pré-oviposição de 4,0 dias. A fêmea colocou, em média, 74 ovos em um período de 27,2 dias, a oviposição média diária de 2,7 ovos/fêmea/dia, o período de pós-oviposição de 3,7 dias e a longevidade de Bracon sp. foi de 34 dias para as...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Insecta; Bracon sp.; Biologia; Bicudo do algodoeiro.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000400001

Production of single superphosphate labeled with 34S
Provedor de dados: 63
Autores: Rossete,Alexssandra Luiza Rodrigues Molina; Carneiro,Josiane Meire Toloti; Bendassolli,José Albertino; Tavares,Claudineia Raquel Oliveira; Sant'Ana Filho,Carlos Roberto.
Single superphosphate is currently one of the mostly used fertilizers as an alternative source for phosphorus and sulphur. Sulphur presents four stable isotopes (32S, 33S, 34S, and 36S) with natural abundances of 95.00; 0.76; 4.22; and 0.014% in atoms, respectively. Single superphosphate labeled with the 34S isotope was obtained from a chemical reaction in stoichiometric amounts between Ca(H2PO4)2 and Ca34SO4.2H2O. Calcium sulphate (Ca34SO4.2H2O) was enriched with 5.85 ± 0.01 atoms % of 34S. The Ca(H2PO4)2 reagent was obtained from a reaction between CaCl2.2H2O and H3PO4. The reaction between the Ca(H2PO4)2 thus produced and the labeled Ca34SO4.2H2O compound was then performed to obtain the 34S-labeled single surperphosphate. The thermal decomposition of...
Palavras-chave: Isotopic determinations; Sulphur; Stable isotopes; Mass spectrometry; Labeled compounds.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000100013

Validation of the Deardorff model for estimating energy balance components for a sugarcane crop
Provedor de dados: 63
Autores: Rolim,Glauco de Souza; Escobedo,João Francisco; Oliveira,Amauri Pereira.
The quantification of the available energy in the environment is important because it determines photosynthesis, evapotranspiration and, therefore, the final yield of crops. Instruments for measuring the energy balance are costly and indirect estimation alternatives are desirable. This study assessed the Deardorff's model performance during a cycle of a sugarcane crop in Piracicaba, State of São Paulo, Brazil, in comparison to the aerodynamic method. This mechanistic model simulates the energy fluxes (sensible, latent heat and net radiation) at three levels (atmosphere, canopy and soil) using only air temperature, relative humidity and wind speed measured at a reference level above the canopy, crop leaf area index, and some pre-calibrated parameters...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Energy budget; Net radiation; Latent heat flux; Sensible heat flux; Microclimate.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000400001

Manipulation of fire ant density, Solenopsis spp., for short-term reduction of Diatraea saccharalis larval densities in Brazil
Provedor de dados: 63
Autores: Rossi,Marcelo Nogueira; Fowler,Harold Gordon.
The sugarcane borer, Diatraea saccharalis (Fabr.) is the main sugarcane pest in Brazil. In the State of São Paulo, the main active population control of D. saccharalis is by inundative releases of the exotic parasitoid, Cotesia flavipes (Cam.). However, the production of C. flavipes in sugar mills entails costs and few studies have evaluated the effects of native predators on sugarcane borer populations. Using a simple colony translocation method, we evaluated the effect of fire ants (Solenopsis spp.) on population densities of D. saccharalis and concurrently upon rates of parasitism by classical biological control agents in the São João sugar mill in the State of São Paulo, Brazil. The translocation technique proved to be feasible and economically...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sugarcane borer; Predation; Colony translocation; Parasitoids.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000200027

Characteristics of Bromus cartharticus Vahl (Poaceae) natural populations collected in the central area of Argentina
Provedor de dados: 63
Autores: Rosso,Beatriz; Pagano,Elba; Rimieri,Pedro; Ríos,Raúl.
Collection of Bromus catharticus Vahl was carried out in the Argentine humid and sub-humid central area. Sixty-eight natural populations are conserved for medium and long term in Pergamino Germplasm Bank and in IRB Germplasm Bank, and ten morphological and agronomic traits were evaluated in the field during two years. There was variability for the traits considered among the accessions. Those populations from the subhumid area showed differences in valuable attributes for breeding. Exploration of marginal areas for this species might be an effective way to add variability to this collection.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Evaluation; Germplasm; Prairie grass; Plant breeding.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000200019

Analysis of VRN1 gene in triticale and common wheat genetic background
Provedor de dados: 63
Autores: Nowak,Michał; Leśniowska-Nowak,Justyna; Zapalska,Magdalena; Banaszak,Zofia; Kondracka,Katarzyna; Dudziak,Karolina; Kowalczyk,Krzysztof.
In cereals, the transition from the vegetative stage to flowering is controlled in the main by the set of vernalization genes. Within these genes the most important role is played by VRN1, which encodes a MADS-box transcription factor, regulating the transition of shoot apical meristem to the reproductive phase. The level of vernalization requirement is strongly linked to the molecular structure of this gene. In this study we analyzed molecular mechanisms regulating the vernalization requirement in triticale on the basis of comparative analysis of the VRN1 locus between triticale (×Triticosecale Witt.) and common wheat (Triticum aestivum L.) genotypes. We also estimated the influence of VRN genotype on heading time and the winter hardiness of these two...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: ×Triticosecale Witt.; Triticum aestivum L.; Vernalization; VERNALIZATION 1 gene; Heading time.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162014000500006

Climatic effects on sugarcane ripening under the influence of cultivars and crop age
Provedor de dados: 63
Autores: Cardozo,Nilceu Piffer; Sentelhas,Paulo Cesar.
The lack of information about the effects of cultivars, crop age and climate on the sugarcane (Saccharum ssp.) crop yield and quality has been the primary factor impacting the sugar-ethanol sector in Brazil. One of the processes about which we do not have a satisfactory understanding is sugarcane ripening and the effects of cultivars, crop age and climate on that. Sugarcane ripening is the process of sucrose accumulation in stalks, which is heavily influenced by several factors, mainly by climatic conditions such as air temperature and water deficits. Because it is a complex process, studies of the variables involved in sugarcane ripening can provide important information, resulting in a better use of commercial cultivars, bringing advantages to growers,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Saccharum spp; Air temperature; Precipitation; Water deficit; Sucrose.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162013000600011

Soil spatial variability and the estimation of the irrigation water depth
Provedor de dados: 63
Autores: Reichardt,Klaus; Silva,José Carlos de Araújo; Bassoi,Luis Henrique; Timm,Luís Carlos; Oliveira,Julio Cesar Martins de; Bacchi,Osny Oliveira Santos; Pilotto,João Eduardo.
The effects of soil water spatial variability previous to irrigation and of the field capacity on the estimation of irrigation water depth are evaluated. The experiment consisted of a common bean (Phaseolus vulgaris L.) crop established on a Kandiudalfic Eutrudox of Piracicaba, SP, Brazil, irrigated by central pivot, in which soil water contents were evaluated with a depth neutron gauge, in a grid of 20x4 points with lag of 0.5 m. In a given situation, the 80 calculated irrigation water depths presented a coefficient of variation of 29.3%, with an average water value of 18 mm, maximum of 41mm and minimum of 9 mm. It is concluded that the only practical way of irrigation is the use of an average water depth, due to the inherent variability of the soil, and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Irrigation water depth; Field capacity; Spatial variability.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000300017

Decision trees for digital soil mapping on subtropical basaltic steeplands
Provedor de dados: 63
Autores: Giasson,Elvio; Sarmento,Eliana Casco; Weber,Eliseu; Flores,Carlos Alberto; Hasenack,Heinrich.
When soil surveys are not available for land use planning activities, digital soil mapping techniques can be of assistance. Soil surveyors can process spatial information faster, to assist in the execution of traditional soil survey or predict the occurrence of soil classes across landscapes. Decision tree techniques were evaluated as tools for predicting the ocurrence of soil classes in basaltic steeplands in South Brazil. Several combinations of types of decicion tree algorithms and number of elements on terminal nodes of trees were compared using soil maps with both original and simplified legends. In general, decision tree analysis was useful for predicting occurrence of soil mapping units. Decision trees with fewer elements on terminal nodes yield...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: GIS; Soil survey; Terrain analysis.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000200006

Melatonin in maturation media fails to improve oocyte maturation, embryo development rates and DNA damage of bovine embryos
Provedor de dados: 63
Autores: Takada,Luciana; Martins Junior,Alicio; Mingoti,Gisele Zoccal; Balieiro,Julio César Carvalho; Coelho,Lia Alencar.
Melatonin (MEL) acts as a powerful scavenger of free radicals and direct gonadal responses to melatonin have been reported in the literature. Few studies, however, have evaluated the effect of MEL during in vitro maturation (IVM) on bovine embryos. This study tested the addition of MEL to maturation medium (MM) with no gonadotropins on nuclear maturation and embryo development rates and the incidence of DNA damage in resulting embryos. Cumulus-oocyte complexes were aspirated from abattoir ovaries and cultured in MM (TCM-199 medium supplemented with 10% fetal calf serum - FCS) at 39ºC and 5% CO2 in air. After 24 hours of culture in MM with 0.5 µg mL-1 FSH and 5.0 µg mL-1 LH; 10-9 M MEL) or 10-9 M MEL, 0.5 µg mL-1 FSH and 5.0 µg mL-1 LH, the oocytes were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Comet assay; Embryos; Gonadotropins; In vitro fertilization; Melatonin.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000400003

Efeitos do beneficiamento na qualidade de sementes de milho infectadas por Fusarium moniliforme sheld
Provedor de dados: 63
Autores: Carvalho,M.L.M. de; Bilia,D.A.C.; Silva,W.R. da; Menezes,J.R. de.
Com o objetivo de avaliar os efeitos do beneficiamento na qualidade de lotes com sementes de milho infectadas com Fusarium moniliforme Sheld, sementes foram submetidas à classificação por peneiras, originando 4 frações (24/64; 22/64; 20/64; 18/64 de polegada) e à separação por peso através da ação da mesa gravitational, originando três frações que foram individualmente submetidas ao mesmo equipamento gerando, cada uma, mais três frações. Todas as frações foram avaliadas quanto à germinação, ao vigor, à densidade, ao peso de mil sementes e à sanidade. A classificação por largura não é eficaz para separar as sementes infectadas; no entanto, o aumento da largura das sementes é acompanhado pela elevação dos valores da germinação e do vigor.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Milho; Sementes; Beneficiamento; F. moniliforme.
Ano: 1993
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161993000200018

OCORRÊNCIA DE Gynandrobrotica caviceps adumbrata Bech. (COLEOPTERA: GALERUCINAE) NA CULTURA DA SOJA EM PIRACICABA, SP
Provedor de dados: 63
Autores: Pinheiro,J.B.; Vello,N.A.
A presença de Gynadrobrotica caviceps adumbrata Bech. foi observada durante as safras de 1990/91 e 1991/92, infestando e danificando folhas de soja, em Piracicaba, SP. Este é o primeiro relato sobre este coleóptero danificando soja no Brasil.
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Inseto; Praga; Glycine max; Soja.
Ano: 1997
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161997000200022

A smartphone-based apple yield estimation application using imaging features and the ANN method in mature period
Provedor de dados: 63
Autores: Qian,Jianping; Xing,Bin; Wu,Xiaoming; Chen,Meixiang; Wang,Yan'an.
ABSTRACT: Apple yield estimation using a smartphone with image processing technology offers advantages such as low cost, quick access and simple operation. This article proposes distribution framework consisting of the acquisition of fruit tree images, yield prediction in smarphone client, data processing and model calculation in server client for estimating the potential fruit yield. An image processing method was designed including the core steps of image segmentation with R/B value combined with V value and circle-fitting using curvature analysis. This method enabled four parameters to be obtained, namely, total identified pixel area (TP), fitting circle amount (FC), average radius of the fitting circle (RC) and small polygon pixel area (SP). A...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Potential yield prediction model; Image processing; Mobile phone application development; Orchard precision management.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162018000400273

Condicionamento osmótico em sementes de cebola: I. efeitos sobre a germinação
Provedor de dados: 63
Autores: Trigo,Maria Fernanda Otero Otumuro; Nedel,Jorge Luiz; Trigo,Luis Felipe Navia.
Lotes de sementes de cebola, cultivares Aurora e Petrolini, de diferentes níveis de vigor, foram osmocondicionados utilizando soluções aquosas de KNO3 e de PEG, nos tempos de embebição de 0 (controle), 24 e 48 horas, à temperatura de 20°C e com aeração constante. Após os tratamentos as sementes foram secas em estufa a 30°C até atingirem os níveis iniciais de umidade, em seguida foi efetuada uma divisão das sementes em porções iguais: uma foi armazenada em sacos de papel no interior de um dessecador por seis meses e a outra foi submetida imediatamente as avaliações em laboratório. Os resultados mostraram que a velocidade e a percentagem total de germinação sob condições de estresse aumentaram nas sementes de cebola osmocondicionadas. As sementes...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Allium cepa; Priming; Viabilidade; Qualidade; Armazenamento.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000500007

Testes de envelhecimento acelerado e de deterioração controlada para avaliação do vigor de sementes de soja
Provedor de dados: 63
Autores: Marcos Filho,Júlio; Novembre,Ana Dionisia Coelho; Chamma,Helena Maria Carmignani Pescarin.
A avaliação do de vigor é um importante componente no controle de qualidade da indústria de sementes. A pesquisa, conduzida com sementes de soja [Glycine max (L.) Merrill], não classificadas pelo tamanho, dos cultivares BR-37 e Embrapa 48, teve como objetivos estudar diferentes procedimentos para a distribuição das amostras na superfície da tela metálica das caixas plásticas, que constituem compartimentos individuais (câmaras internas), durante os períodos de exposição ao envelhecimento acelerado e de comparar os resultados com os do teste de deterioração controlada. No teste de envelhecimento acelerado foram utilizadas quatro subamostras para cada lote, previamente pesadas (42,5 g) ou distribuídas de modo a formar uma camada única de sementes na...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycine max; Sementes; Análise; Potencial fisiológico.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000200029

Aflatoxin removal of peanut meals with aqueous ethanol
Provedor de dados: 63
Autores: Fonseca,H.; Regitano-d'Arce,M.A.B.
A preliminary approach to achieve compatible simultaneous extraction of aflatoxin and residual oil from pressed oil meals was conducted to determine the minimum amount of water to be added to ethanol versus necessary time to achieve complete removal of aflatoxin. Commercial anhydrous, 96, 93 and 90°GL ethanol were utilized in trials with Soxhlet extractors. Commercial anhydrous ethanol did not remove aflatoxin completely and the extraction efficiency in minutes was directly proportional to the amount of water present in the ethanol, as expected. Although 96°GL ethanol was efficient, alcoholic strengths between 96 and 99°GL need be evaluated to improve oil extraction, provided they do not decrease aflatoxin removal efficiency.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aflatoxin; Peanut meal; Oil meals; Removal; Extraction; Aqueous ethanol; Ethanol.
Ano: 1993
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161993000100021

ARMAZENAMENTO REFRIGERADO DE AMEIXAS `REUBENNEL' (Prunus salicina Lindl.): EFEITOS DO ESTÁDIO DE MATURAÇÃO E DO POLIETILENO
Provedor de dados: 63
Autores: Kluge,R.A.; Bilhalva,A.B.; Cantillano,R.F.F.
Para verificar os efeitos do estádio de maturação e da embalagem de polietileno, ameixas `Reubennel' foram colhidas em dois estádios de maturação: verde (25-50% de coloração vermelha) e semimaduro (50-75% de coloração vermelha) e armazenadas à 0oC e 90-95% UR por 14, 28 e 42 dias (+ 3 dias de comercialização simulada à 25-26oC). A metade das frutas foi embalada em sacos de polietileno perfurado. O polietileno reduziu as perdas de peso das frutas durante o armazenamento, sem afetar outros parâmetros de qualidade estudados (firmeza de polpa, sólidos solúveis totais, acidez total titulável e relação sólidos solúveis totais/acidez total titulável). As frutas deste cultivar conservaram-se bem até 42 dias e o melhor estádio de maturação para o armazenamento foi...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Polietileno; Estádio de maturação; Frigoconservação; Ameixas.
Ano: 1996
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161996000200006

Spatial pattern detection modeling of thrips (Thrips tabaci) on onion fields
Provedor de dados: 63
Autores: Ribeiro Jr,Paulo Justiniano; Viola,Denise Nunes; Demétrio,Clarice Garcia Borges; Manly,Bryan F.; Fernandes,Odair Aparecido.
Onion (Allium cepa) is one of the most cultivated and consumed vegetables in Brazil and its importance is due to the large laborforce involved. One of the main pests that affect this crop is the Onion Thrips (Thrips tabaci), but the spatial distribution of this insect, although important, has not been considered in crop management recommendations, experimental planning or sampling procedures. Our purpose here is to consider statistical tools to detect and model spatial patterns of the occurrence of the onion thrips. In order to characterize the spatial distribution pattern of the Onion Thrips a survey was carried out to record the number of insects in each development phase on onion plant leaves, on different dates and sample locations, in four rural...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Poisson distribution; Spatial statistics; Randomization tests; Geostatistics.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000100013

Old tools as new support for on farm conservation of different types of maize
Provedor de dados: 63
Autores: Vidal,Rafael; Silva,Natália Carolina de Almeida; Ogliari,Juliana Bernardi.
ABSTRACT: A germplasm collection should represent the diversity of the target species and the gene pools associated with it. However, it is critical to establish collection plans which ensure such representativeness. At times it is difficult to identify the best strategy for collecting domesticated species that are conserved in situ/on farm, since, in general, the magnitude of the diversity existing in a geographical area was hitherto unknown. The Diversity Census methodology was developed for previous diagnosis of the diversity of Zea mays subsp. mays L., conserved by farmers in two municipalities in the far western region of the state of Santa Catarina, southern Brazil. The Diversity Census database allowed for the identification of the best strategy to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays L.; Genetic diversity; Morphological characters; Use values.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000101100

Automation in accession classification of Brazilian Capsicum germplasm through artificial neural networks
Provedor de dados: 63
Autores: Ferreira,Mariane Gonçalves; Azevedo,Alcinei Mistico; Siman,Luhan Isaac; da Silva,Gustavo Henrique; Carneiro,Clebson dos Santos; Alves,Flávia Maria; Delazari,Fábio Teixeira; da Silva,Derly José Henriques; Nick,Carlos.
ABSTRACT Germplasm classification by species requires specific knowledge on/of the culture of interest. Therefore, efforts aimed at automation of this process are necessary for the efficient management of collections. Automation of germplasm classification through artificial neural networks may be a viable and less laborious strategy. The aims of this study were to verify the classification potential of Capsicum accessions regarding/ the species based on morphological descriptors and artificial neural networks, and to establish the most important descriptors and the best network architecture for this purpose. Five hundred and sixty-four plants from 47 Brazilian Capsicum accessions were evaluated. Neural networks of multilayer perceptron type were used in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Capsicum spp.; Garson’s method; Artificial intelligence; Taxonomy; Germplasm bank.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162017000300203

Resposta de genótipos de milho ao estresse salino em condições hidropônicas
Provedor de dados: 63
Autores: Willadino,Lilia; Martins,Marcos Henrique Brainer; Camara,Terezinha Rangel; Andrade,Arnobio Gonçalves; Alves,Gilberto Dias.
Quatro genótipos de milho (Zea mays L.), Jatinã C3 anão, BR-201, V-190 e LW-1, foram avaliados quanto à tolerância ao estresse salino (0, 50 e 100 mM NaCl) em condições hidropônicas. As plantas submetidas a 100 mM de NaCl durante 29 dias apresentaram uma redução na produção de matéria seca superior a 50%, e uma redução na área foliar superior a 75%, quando comparadas ao tratamento controle (0 mM NaCl). Dentre os quatro genótipos estudados, a linha pura LW-1 apresentou produção de matéria seca e área foliar inferiores aos demais. O aumento dos níveis de sal na solução resultou em uma diminuição da taxa de crescimento da parte aérea e da raiz, de todos os genótipos. O sistema radicular apresentou os maiores teores de sódio e também os maiores decréscimos na...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Salinidade; Tolerância; Taxa de crescimento; Área foliar.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000500024

Estimativa da produtividade de arroz irrigado por inundação em em função da temperatura do ar e da radiação solar
Provedor de dados: 63
Autores: Pedro Júnior,M.J.; Sentelhas,P.C.; Moraes,A.V.C.; Villela,O.V.
Foram desenvolvidas duas equações de estimativa da produtividade do arroz irrigado por inundação, para as variedades: IAC-242, IAC-100, IAC-101 e IAC-102, em função da temperatura do ar e da radiação solar, no período crítico de formação da produção, para a região de Pindamonhangaba (SP). Os valores de temperatura do ar e de radiação solar ótimos encontrados para as variedades foram, respectivamente, 25,0oC e 475 cal.cm-2.dia-1. O modelo agrometeorológico desenvolvido para previsão da produtividade da cultura que apresentou melhores resultados quando testado com dados independentes foi o que relacionou o menor desvio dos dois elementos climáticos em relação ao valor ótimo obtido através de uma equação de regressão linear múltipla. Os valores de...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Arroz irrigado por inundação; Modelo agrometeorológico; IAC-242; IAC-100; IAC-101; IAC-102.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000100017

Nitrogen fertilization of fall panicum cultivars (Panicum dichotomiflorum Michx.): biochemical and agronomical aspects
Provedor de dados: 63
Autores: Soratto,Rogério Peres; Lima,Eduardo do Valle; Silva,Tiago Roque Benetoli da; Boaro,Carmen Sílvia Fernandes; Cataneo,Ana Catarina.
Information on improved fall panicum cultivars and agronomical pratices is scarce because of the relatively small importance of this crop in Brazil. The present study aimed to evaluate levels of nitrogen sidedressing on plant development and biochemical characteristics of two fall panicum cultivars. The experiment was set up under plastic tunnel conditions in Botucatu, São Paulo, Brazil, with plants growing inside asbestos-cement boxes. The experimental design was a randomized block setup and treatments consisted of six levels of nitrogen fertilization (0, 40, 80, 120, 160, and 200 mg L-1) applied at the onset of tillering on two fall panicum cultivars (AL Mogi and AL Tibagi). The application of increasing levels of nitrogen to fall panicum plants...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nitrogen; Sidedressing fertilization; Mineral nutrition.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000100014

Water erosion in surface soil conditions: runoff velocity, concentration and D50 index of sediments in runoff
Provedor de dados: 63
Autores: Ramos,Júlio César; Bertol,Ildegardis; Barbosa,Fabrício Tondello; Bertól,Camilo; Mafra,Álvaro Luiz; Miquelluti,David José; Mecabô Júnior,José.
ABSTRACT Water erosion and contamination of water resources are influenced by concentration and diameter of sediments in runoff. This study aimed to quantify runoff velocity and concentration and the D50 index of sediments in runoff under different soil surface managements, in the following treatments: i) cropped systems: no-tilled soil covered by ryegrass (Lolium multiflorum Lam.) residue, with high soil cover and minimal roughness (HCR); no tilled soil covered by vetch (Vicia sativa L.) residue, with high soil cover and minimal roughness (HCV); chiseled soil after ryegrass crop removing the above-ground residues and keeping only the root system, with high roughness (HRR); chiseled soil after vetch crop removing the above-ground residues and keeping only...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hydric; Erosion; Soil management; Conservation tillage.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000300286

A critical survey of optimization methods in industrial forest plantations management
Provedor de dados: 63
Autores: Belavenutti,Pedro; Romero,Carlos; Diaz-Balteiro,Luis.
ABSTRACT: The application of optimization methods to forest management has given rise to a successful line of investigation in recent decades. However, there have been few publications associated with the application of these techniques to the management of industrial forest plantations (those with short or medium rotations, always less than 50 years), which consider the important role played by these forest systems in the supply of diverse goods and services. This study presents an overview of this literature which, by analyzing 67 articles published in journals contained in the ISI Web of Science, highlight, among other aspects, the techniques employed, their evolution, their planning type (strategic, tactical or operational), the functional objectives...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mathematical programming; Forest management; Industrial plantations; Timber harvest scheduling.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162018000300239

Alterações na atividade da peroxidase e do conteúdo de carboidratos em mandioca cultivada in vitro sob estresse salino
Provedor de dados: 63
Autores: LIMA,G.P.P.; FERNANDES,A.A.H.; CATÂNEO,A.C.; CEREDA,M.P.; BRASIL,O.G.
A influência de estresse induzido por cloreto de sódio (75 e 150 mM) sobre o conteúdo de carboidratos solúveis e atividade da peroxidase, foi estudada em plântulas de mandioca cultivadas in vitro. Os resultados mostraram que a atividade da peroxidase diminuiu gradualmente durante o crescimento de plântulas em todos os tratamentos. O conteúdo de açúcares redutores foi menor em plântulas submetidas a 75 mM de NaCl, nas fases mais adiantadas do desenvolvimento, em comparação com a dose mais elevada do sal (150 mM de NaCl) ou sua omissão. Os resultados obtidos indicaram que o NaCl alterou o metabolismo de carboidratos, atividade da peroxidase e o crescimento de plântulas cultivadas in vitro.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Peroxidase; Carboidratos; Manihot esculenta; NaCl.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000300009

Genetic control of wheat seedling root growth
Provedor de dados: 63
Autores: Camargo,Carlos Eduardo de Oliveira; Ferreira Filho,Antonio Wilson Penteado.
Wheat cultivars should have long primary roots to allow good crop establishment, considering the short crop establishment season (April) in the State of São Paulo, Brazil, where the occurrence of water stress is frequent. This paper demonstrates the control and type of inheritance of the primary root growth trait. Crosses were made between genotypes, BH-1146 and KAUZ "S"/IAC-24 M4 with strong and reduced primary root growth, respectively. F2 and F3 generation seeds from these crosses and F2 generation seeds from the backcrosses of both parents were also obtained. Seedlings from these genotypes plus the parentals were evaluated in relation to primary root growth in complete nutrient solutions containing 3.875 mg L-1 phosphorus, at pH 4.0 and a temperature...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Root growth; Nutrient solution; Recessive genes.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000400004

Association of PIT1 genotypes with growth traits in Canchim cattle
Provedor de dados: 63
Autores: Carrijo,Sônia Mara; Alencar,Maurício Mello de; Toral,Fábio Luiz Buranelo; Regitano,Luciana Correia de Almeida.
Use of genetic markers can aid on the identification of animals with highest breeding values in beef cattle. The PIT1 gene codes for the Pit-1 transcription factor is essential for the activation of prolactin, growth hormone and PIT1 genes. This research is an investigation of the effect of PIT1-HinfI polymorphism on growth traits of 509 Canchim animals, from two lineages, GG1 and GG2. PIT1 genotypes were identified through PCR-RFLP. Genotype effect on phenotypic values for birth weight (BW), standardized weaning weight (W240), weight at 12 months of age (W365), and the average daily weight gain from birth to weaning (AGBW), and from weaning to 12 months of age (AGW12) were analyzed by the least squares method. Effects of the interaction between the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: RFLP; Bovine; Pituitary factor 1; Candidate gene.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000200002

Resistance to stem canker, frogeye leaf spot and powdery mildew of soybean lines lacking lipoxigenases in the seeds
Provedor de dados: 63
Autores: Martins,Carlos Alberto Osório; Sediyama,Carlos Sigueyuki; Oliveira,Maria Goreti de Almeida; Reis,Múcio Silva; Rocha,Valterley Soares; Moreira,Maurílio Alves; Gomes,José Luiz Lopes.
The soybean [Glycine max (L.) Merrill] crop holds a prominent position in the Brazilian economy because of the extension of the planted area and volume of grain production, but the beany flavor has been a limiting factor for soybean derivatives consumption by western population. This flavor is produced mainly by action of lipoxygenase enzymes (Lox1, Lox2 and Lox3), present in some commercial varieties. The genetic elimination of the alleles that codify these enzymes is the most appropriate way to avoid problems associated to this deleterious flavor. To elucidate the effect of seed lipoxygenase elimination on the resistance to plant pathogens, normal varieties of soybean (FT-Cristalina RCH, Doko RC and IAC-12) and their backcross-derived lines, both with...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycine max; Breeding; Genetics.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000400013

Influência do teor de água do substrato no enraizamento de estacas de eválvulo branco (Evolvulus pusilus)
Provedor de dados: 63
Autores: Piana,Z.; Cavariani,C.; Tillmann,M.A.A.; Minami,K.
Objetivando verificar a influência do teor de água do substrato no enraizamento de estacas de eválvulo branco (Evolvulus pusilus), conduziu-se um ensaio sob condições de laboratório. Os efeitos de cinco níveis de água no substrato (solo x areia 3:1 de 20, 40, 60, 80 e 100% da capacidade de retenção) no enraizamento, foram avaliados através da porcentagem de estacas enraizadas. Para cada repetição, 20 estacas apicais, com comprimento médio de 15 cm, foram introduzidas a uma profundidade de 6 cm, perfazendo 80 estacas por tratamento. Os resultados permitiram concluir que o teor de água do substrato entre 50% e 70% da capacidade de retenção, possibilitou enraizamento superior para estacas de eválvulo branco.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Água; Enraizamento; Eválvulo branco; Evolvulus pusilus.
Ano: 1994
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000300015

Influência do manganês sobre a nutrição mineral e crescimento da pimenteira do reino (Piper nigrum, L.)
Provedor de dados: 63
Autores: Veloso,C.A.C.; Muraoka,T.; Malavolta,E.; Carvalho,J.G. de.
A pimenteira do reino (Piper nigrum, L.) vem sendo cultivada em sua maior parte em solos com acidez elevada e balia saturação por bases. O manganês em condições de alta acidez pode provocar toxidez às plantas. Visando estudar os efeitos do manganês nessa cultura foi conduzido um experimento com a cultivar Guajarina em solução nutritiva, O manganês foi fornecido nas concentrações de 0; 10; 20; 30; 40 e 50 mg/L. Na ausência do elemento foram observados sintomas de deficiência e redução no crescimento. O excesso de manganês (30 mg/L) na solução nutritiva reduziu o desenvolvimento das plantas e a absorção de P, K, Ca, Mg, Cu, Fe e ZN. Observaram-se sintomas de toxidez de manganês a partir da concentração de 20 mg/L, caracterizados por cloróse e pontos...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pimenteira do reino; Nutrição mineral; Solução nutritiva; Toxidez de manganês.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000200028

Positioning of sensors for control of ventilation systems in broiler houses: a case study
Provedor de dados: 63
Autores: Curi,Thayla Morandi Ridolfi de Carvalho; Conti,Dante; Vercellino,Rimena do Amaral; Massari,Juliana Maria; Moura,Daniella Jorge de; Souza,Zigomar Menezes de; Montanari,Rafael.
ABSTRACT Ventilation systems are incorporated at intensive poultry farms to control environment conditions and thermal comfort of broilers. The ventilation system operates based on environmental data, particularly measured by sensors of temperature and relative humidity. Sensors are placed at different positions of the facility. Quality, number and positioning of the sensors are critical factors to achieve an efficient performance of the system. For this reason, a strategic positioning of the sensors associated to controllers could support the maintenance and management of the microclimate inside the facility. This research aims to identify the three most representative points for the positioning of sensors in order to support the ventilation system during...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Broiler farms; Environmental control; Geostatistics; Ordinary kriging; Welfare.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162017000200101

Utilização de fósforo do solo e do fertilizante por tomateiro
Provedor de dados: 63
Autores: Alvarez V.,Felipe Carlos; Duete,Robson Rui Cotrim; Muraoka,Takashi; Duete,Washington Luiz Cotrim; Abreu Jr.,Cassio Hamilton.
O fósforo, embora seja o macronutriente em menor concentração na maioria das culturas, é o mais aplicado como fertilizante mineral, constituindo uma parcela significativa do custo de produção agrícola. O conhecimento das diferenças entre variedades de plantas em relação à absorção do fósforo do solo e do fertilizante torna-se de grande importância para programas de melhoramento e manejo da adubação fosfatada. Utilizando a técnica do traçador radioativo 32P, foram avaliadas as diferenças na absorção de fósforo proveniente do solo e do fertilizante (superfosfato triplo), na disponibilidade de P do solo pelos valores L e A e nas eficiências fisiológica, ecofisiológica e agronômica do nutriente pelas variedades comerciais de tomate (Licopersicum esculentum...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Licopersicum esculentum; Valor A; Valor L; 32P; Radioisótopo.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000100024

Straw removal of sugarcane from soil and its impacts on yield and industrial quality ratoons
Provedor de dados: 63
Autores: Aquino,Gisele Silva de; Medina,Cristiane de Conti; Silvestre,Danilo Augusto; Gomes,Emerson Crivelaro; Cunha,Ana Carolina Benitez; Kussaba,Deise Akemi Omori; Almeida,Luis Fernando; Shahab,Muhammad; Santiago,Antonio Dias.
ABSTRACT: Mechanical harvesting leaves in its wake a considerable amount of straw in the field, which can be effectively utilized to improve the soil condition and sugarcane yield. However, there is no specific information as to the quantity of straw mulch required to achieve such effects and as to whether it can be used in other sectors for bioelectricity and ethanol production. The aim of this research was to evaluate the effect of removing different amounts of straw from the field and its impact on the yield and industrial quality of sugarcane ratoons. The experiment was carried out on Rhodic soil where six treatments were evaluated including 0 %, 25 % (5 Mg ha−1), 50 % (10 Mg ha−1), 75 % (15 Mg ha−1), 100 % (20 Mg ha−1) straw on the soil surface and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biomass; Management of straw; Mulching; Saccharum spp.; Technological characteristics.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162018000600526

Recovery of ammonia from anaerobically digested manure using gas-permeable membranes
Provedor de dados: 63
Autores: García-González,Maria Cruz; Vanotti,Matias B.; Szogi,Ariel A.
ABSTRACT Nitrogen (N) can be recovered from different types of wastewaters. Among these wastewaters, anaerobically digested swine manure (digestate) has the highest N content in ammonia form (NH3). It is desirable to reduce N in digestate effluents to safely incorporate them in arable soil in N vulnerable zones (NVZ) and to mitigate NH3 emissions during N land application. Additional benefit is to minimize inhibition of the anaerobic process by removing NH3 during the anaerobic digestion process. This work aimed to apply the gas-permeable membrane technology to evaluate ammonia (NH3) recovery from high-ammonia digested swine manure. Anaerobically digested swine manure with NH4+ content of 4,293 mg N L−1 was reduced by 91 % (to 381 mg N L−1) during the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: N removal; Digestate; Manure management; Membrane technology.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000500434

Estimating the total leaf area of the green dwarf coconut tree (Cocos nucifera L.)
Provedor de dados: 63
Autores: Sousa,Elias Fernandes de; Araújo,Marilaine Campanati; Posse,Robson Prucoli; Detmann,Edenio; Bernardo,Salassier; Berbert,Pedro Amorim; Santos,Paulo Albernaz dos.
Leaf area has significant effect on tree transpiration, and its measurement is important to many study areas. This work aimed at developing a non-destructive, practical, and empirical method to estimate the total leaf area of green dwarf coconut palms (Cocos nucifera L.) in plantations located at the northern region of Rio de Janeiro state, Brazil. A mathematical model was developed to estimate total leaf area values (TLA) as function of the average lengths of the last three leaf raquis (LR3), and of the number of leaves in the canopy (NL). The model has satisfactory degree of accuracy for agricultural engineering purposes.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Canopy structure; Mathematic model; Estimating model.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000600014

Homogeneous zones of vegetation index for characterizing variability and site-specific management in vineyards
Provedor de dados: 63
Autores: Oldoni,Henrique; Costa,Bruno Ricardo Silva; Bognola,Itamar Antônio; Souza,Claudia Rita de; Bassoi,Luís Henrique.
ABSTRACT Characterization of the spatial variability of vegetative vigor in vineyards can help improve the performance of site-specific management practices, or the management of vineyards with different rates. Characterization using canopy proximal sensing has been a widely disseminated technique; however, vineyards in southeastern Brazil, where the utilization of annual double pruning results in a winter harvest, knowledge of the role of variability in improving vineyard management has not yet been applied. This study aimed to determine if post-veraison mapping of a normalized difference vegetation index could be used to assess the variability in grapevine vigor, water status, physiology, yield and berry quality attributes at harvest in an irrigated...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vitis vinifera L.; Precision viticulture; Proximal sensing; Vegetative vigor; Grape quality.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000400101

Spatial prediction of soil penetration resistance using functional geostatistics
Provedor de dados: 63
Autores: Cortés-D,Diego Leonardo; Camacho-Tamayo,Jesús Hernán; Giraldo,Ramón.
ABSTRACT Knowledge of agricultural soils is a relevant factor for the sustainable development of farming activities. Studies on agricultural soils usually begin with the analysis of data obtained from sampling a finite number of sites in a particular region of interest. The variables measured at each site can be scalar (chemical properties) or functional (infiltration water or penetration resistance). The use of functional geostatistics (FG) allows to perform spatial curve interpolation to generate prediction curves (instead of single variables) at sites that lack information. This study analyzed soil penetration resistance (PR) data measured between 0 and 35 cm depth at 75 sites within a 37 ha plot dedicated to livestock. The data from each site were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Functional Kriging; Compaction; Spatial variability; Functional data.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000500455

Estimating forage intake of lactating dual-purpose cows using chromium oxide and n-alkanes as external markers
Provedor de dados: 63
Autores: Oliveira,Dimas Estrasulas de; Medeiros,Sérgio Raposo de; Tedeschi,Luis Orlindo; Aroeira,Luís Januário Magalhães; Silva,Sila Carneiro da.
The n-alkanes have been used to estimate forage dry matter intake, digestibility and the diet composition in grazing animals. The objective this study was to compare chromium oxide and n-alkanes techniques used to estimate forage intake. Twenty lactating dual-purpose cows receiving two sources of fat (treatments: conjugated linoleic acid (CLA) or Megalac (control)) plus 4 kg of concentrate were dosed with n-alkanes and chromium oxide to estimate the intake of stargrass (Cynodon nlemfüensis Vanderyst var. nlemfüensis). The in vitro dry matter (DM) digestibility of the stargrass and concentrate were used to estimate the nutritive value of the digesta. The n-alkanes between C23 and C36 were quantified in the digesta and feces. The regression between...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Diet composition; Digestibility; Grazing.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000200001

Temperatura no armazenamento de pitanga
Provedor de dados: 63
Autores: Mélo,Enayde de Almeida; Lima,Vera Lúcia Arroxelas Galvão de; Nascimento,Poliana Pinheiro do.
A pitanga (Eugenia uniflora L) é um fruto tropical de elevada perecibilidade que apresenta problemas durante o seu armazenamento e comercialização afetando a qualidade do fruto "in natura". Com objetivo de investigar a influência da temperatura no armazenamento de pitangas em três estádios de maturação, frutos verdes, semi-maduros e maduros foram armazenados durante 30 dias sob refrigeração (8°C ± 1/ U.R.90-95%) e 90 dias sob congelamento (-18°C). Em intervalos de 05, 10, 20, 30, 60, e 90 dias, foram determinados o peso médio, o pH, o teor de sólidos solúveis totais, a acidez total titulável e o teor de vitamina C total. Os frutos, independentemente do estádio de maturação e do tratamento aplicado, apresentaram perda de peso. A refrigeração manteve,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Eugenia uniflora; Armazenamento; Conservação.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000400006

"Banco" de sementes de plantas daninhas em pomar de laranjeira 'pera'
Provedor de dados: 63
Autores: Caetano,Regma S. X.; Christoffoleti,Pedro J.; Victoria Filho,Ricardo.
O "banco" de sementes é um reservatório de sementes de plantas viáveis presentes na camada superficial de solo, que determina a composição de plantas daninhas emergidas na área; no entanto, a composição qualitativa e quantitativa do banco de sementes é determinada principalmente pelas práticas culturais empregadas na área. Sendo assim, foi avaliado o "banco" de sementes de plantas daninhas para determinar as possíveis influências dos diferentes sistemas de manejo utilizados na cultura dos citros. Os tratamentos consistiram da aplicação dos herbicidas diuron (2,0 kg ha-1), em pré-emergência, e glyphosate (1,08 kg ha-1), em pós-emergência, na linha de plantio, associados a cinco práticas de manejo na entrelinha da cultura: gradagem, roçada, dose reduzida de...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Citrus sinensis; Planta daninha; "banco" de sementes; Herbicida.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000300012

Performance of maize single-crosses developed from populations improved by a modified reciprocal recurrent selection
Provedor de dados: 63
Autores: Souza Jr.,Cláudio Lopes de; Barrios,Sanzio Carvalho Lima; Moro,Gustavo Vitti.
Maize (Zea mays L.) elite inbred lines developed from pedigree programs tend to be genetically related. Therefore, it is necessary to incorporate unrelated inbreds to those programs to allow the continued release of outstanding single-crosses. The objectives of this research were to compare the usefulness of a modified reciprocal recurrent selection procedure (MRRS) to improve populations to be used as sources of elite inbreds and outstanding single-crosses to integrate pedigree programs, and to investigate the effects of selection on the relative contribution of general (GCA) and specific combining (SCA) abilities to the single-crosses variation. Eight and six S3 lines from populations IG-3-C1 and IG-4-C1, respectively, selected from the first cycle of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Diallel design; Maize improvement; Combining ability.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000200011

Dissolved organic carbon and bioavailability of N and P as indicators of soil quality
Provedor de dados: 63
Autores: Silveira,Maria Lucia Azevedo.
Soil quality has become an important issue in soil science. Considerable attempts have been made to define soil quality, but a general concept has not yet been accepted by the scientific community. The selection of quantitative indices for soil quality is extremely difficult, and a considerable number of chemical, physical, and biochemical properties have been suggested as potential indicators of soil quality. Because soil organic matter (SOM) can be associated with different soil chemical, physical and biological processes, it has been widely considered as one of the best soil quality indicator. Land use can significantly influence dynamics of organic carbon and N, P, and S cycle. However, changes in total soil organic carbon (SOC) contents in response to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ecosystem management; Sustainability; Indicators of soil quality.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000500017

Modifications for the tukey test procedure and evaluation of the power and efficiency of multiple comparison procedures
Provedor de dados: 63
Autores: Conagin,Armando; Barbin,Décio; Demétrio,Clarice Garcia Borges.
Multiple pairwise comparison tests of treatment means are of great interest in applied research. Two modifications for the Tukey test were proposed. The power of unilateral and bilateral Student, Waller-Duncan, Duncan, SNK, REGWF, REGWQ, Tukey, Bonferroni, Sidak, unilateral Dunnet statistical tests and the modified tests, Sidak, Bonferroni 1 and 2, Tukey 1 and 2, has been compared using the Monte Carlo method. Data were generated for 600 experiments with eight treatments in a randomized block design, of which 400 had four and 200 eight blocks. The differences between the treatment means in relation to the control were 30%, 20%, 15%, 10%, 5%. Two extra treatments did not differ from the control. A coefficient of variation of 10% and a probability Type I...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Multiple comparison statistical tests; Type I errors; Monte Carlo method; Power of tests.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000400016

Soil biochemistry and microbial activity in vineyards under conventional and organic management at Northeast Brazil
Provedor de dados: 63
Autores: Freitas,Nicácio de Oliveira; Yano-Melo,Adriana Mayumi; Silva,Fábio Sérgio Barbosa da; Melo,Natoniel Franklin de; Maia,Leonor Costa.
The São Francisco Submedium Valley is located at the Brazilian semiarid region and is an important center for irrigated fruit growing. This region is responsible for 97% of the national exportation of table grapes, including seedless grapes. Based on the fact that organic fertilization can improve soil quality, we compared the effects of conventional and organic soil management on microbial activity and mycorrhization of seedless grape crops. We measured glomerospores number, most probable number (MPN) of propagules, richness of arbuscular mycorrhizal fungi (AMF) species, AMF root colonization, EE-BRSP production, carbon microbial biomass (C-MB), microbial respiration, fluorescein diacetate hydrolytic activity (FDA) and metabolic coefficient (qCO2). The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vitis vinifera L.; Arbuscular mycorrhizal fungi; Semiarid; Soil microbial activity; Sustainable agriculture.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000200013

Efeito dos fosfatos naturais alvorada, catalão, patos e arad na produção de massa seca de milho em casa-de-vegetação
Provedor de dados: 63
Autores: CAMARGO,M.S. de; SILVEIRA,R.I.
A comparação do comportamento de fosfatos naturais foi feita com a avaliação da produção de massa seca em plantios de milho em vasos (3kg), contendo um Podzólico Vermelho Amarelo, sob condições controladas de casa-de-vegetação. Quatro fosfatos naturais (Alvorada, Catalão, Patos e Arad) foram utilizados em três doses de P (100, 150, e 200 mg kg-1), calculadas com base no fósforo solúvel extraído pelas solubilidades das relações fosfato: solução extratora (g de fosfato mL-1 de ácido cítrico 2%): 1:100; 1:200 e 1:400. O fosfato Alvorada apresentou a maior produção de massa seca inicial, superando os demais fosfatos naturais, inclusive o superfosfato triplo, e não diferindo do fosfato Arad no segundo plantio. A solubilidade em ácido cítrico 2% (1:100) é um...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fosfato natural; Solubilidade; Ácido cítrico 2%; Milho.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000300021

Crop area estimate from original and simulated spatial resolution data and landscape metrics
Provedor de dados: 63
Autores: Soares,Dênis de Moura; Galvão,Lênio Soares; Formaggio,Antônio Roberto.
Images acquired at the same day by the ETM+/Landsat-7 (30 m of spatial resolution) and MODIS/Terra (250 m) sensors were used to estimate areas of three major crops (soybean, sugarcane, and corn) with different landscape patterns in Southeastern Brazil. Majority filtering of ETM + classification results was applied to describe the behavior of 15 selected landscape metrics at distinct simulated spatial resolutions (90, 150, 210 and 270 m). By using regression models, the performance of MODIS and derived metrics to predict adequately the crop area, considering ETM+ data as reference, were analyzed. Results showed that the MODIS instrument overestimated the areas of soybean (15%) and sugarcane (1%), and underestimated the area of corn (12%). Multiple...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: MODIS; Remote sensing; Regression; Soybean; Sugarcane.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000500003

Demanda potencial por um curso de nutrição e conhecimento sobre a profissão por alunos de estabelecimentos de ensino de 2° grau de Piracicaba, SP
Provedor de dados: 63
Autores: Ometto,A.M.H.; Furtuoso,M.C.O.; Pipitone,M.A.P.; Silva,M.V. da; Sturion,G.L.
O universo da pesquisa foi formado por alunos dos estabelecimentos de ensino da rede pública e privada da cidade de Piracicaba, S.P. Foram levantadas informações sobre a opção profissional dos estudantes, o conhecimento do conteúdo dos cursos de nutrição e locais de atuação profissional. Os resultados da pesquisa revelaram a existência de uma substancial demanda potencial por um curso de nutrição a ser oferecido por uma universidade pública, preferencialmente localizada no interior do Estado de São Paulo.
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Nutrição; Atuação profissional; Demanda de alunos.
Ano: 1993
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161993000300027

Marigold (Tagetes erecta L.) as an attractive crop to natural enemies in onion fields
Provedor de dados: 63
Autores: Silveira,Luís Cláudio Paterno; Berti Filho,Evoneo; Pierre,Leonardo Santa Rosa; Peres,Fernanda Salles Cunha; Louzada,Julio Neil Cassa.
Onion is the third most grown vegetable crop in São Paulo state, Brazil. Organic onion farming is expected to increase in the state due to the increasing demand. Pest management in organic onion farming is based on plant extracts with insecticide effects. However, the efficacy of such plant extracts has not been proved yet, and it was observed that they do negatively affect natural enemies. Plants surrounding onion fields, and that are attractive to natural enemies, may be a good option to farmers, since they may lead to increased diversity of arthropod species and, consequently, the natural control of pest populations. This study deals with the effect of marigold plants as a resource plant to natural enemies in onion fields. The experiment was set in a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Natural control; Conservation; Predator; Parasitoid.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000600009

External development of the entomopathogenic fungi Beauveria bassiana and Metarhizium anisopliae in the subterranean termite Heterotermes tenuis
Provedor de dados: 63
Autores: Moino Jr.,Alcides; Alves,Sérgio Batista; Lopes,Rogério Biaggioni; Neves,Pedro Manuel Oliveira Janeiro; Pereira,Roberto Manoel; Vieira,Solange Aparecida.
The subterranean termite Heterotermes tenuis is one of the main pests of sugarcane and eucalyptus in Brazil, and the use of entomopathogenic fungi, alone or associated to chemicals, is an efficient and environmentally favorable method for its control. Studies related to the fungal development on these insects are important due to the effect of insect behavior on entomopathogens. The objective of this work was to describe the external development of Beauveria bassiana and Metarhizium anisopliae on H. tenuis using Scanning Electron Microscopy (SEM), determining the duration of the different phases of fungal infection. Two fixation techniques for preparing SEM samples were also evaluated. Worker specimens of H. tenuis were inoculated with a 1 x 10(9) conidia...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Insecta; Isoptera; Microbial control; Scanning electron microscopy.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000200010

Growth of provenances of Cryptocarya alba during water stress and after re–watering in the nursery
Provedor de dados: 63
Autores: Meza,Sergio Enrique Espinoza; Arce,Marco Aliro Yáñez; Díaz,Carlos Renato Magni; Herrera,Eduardo Enrique Martínez; Ortega,Juan Francisco Ovalle; Miranda,Suraj Antonio Vaswani.
ABSTRACT: Intensification of drought in Mediterranean–type climates has limited seedling establishment. The knowledge of the ecology of selected species and its intraspecific variation to water stress at the seedling stage should be considered in order to overcome limitations. We investigated variations in growth, survival, and leaf–level physiology in four provenances of the endemic Cryptocarya alba (Mol.) during water stress and after re–watering. Seedlings were cultured in the nursery during 23 months and then subjected to two watering treatments based on soil water content (well–watered and water restriction, 0.38 and 0.17 cm3 cm−3, respectively) for 45 days. At the end of the watering treatments, seedling growth, above– and belowground biomass,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sclerophyllus forests; Seed sources; Drought; Plasticity; Biomass allocation.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000701002

Number of recombinations and genetic properties of a maize population undergoing recurrent selection
Provedor de dados: 63
Autores: Lima Neto,Francisco Pinheiro; Souza Júnior,Cláudio Lopes de.
In maize recurrent selection programs, selected genotypes were recombined once to generate genetic variability for the next selection cycle. Selection generates negative gametic phase disequilibrium which reduces genetic variances, and this disequilibrium is not significantly reduced with only one generation of recombination. The objective of this research was to assess the effects of one additional generation of recombination on phenotypic and genotypic parameters in a maize population undergoing recurrent selection. Selected progenies of the EPB-4 population were subjected to one and two generations of recombination, and from each generation half- and full-sib progenies were developed and evaluated at three environments for grain yield, plant and ear...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Maize improvement; Heritability coefficients; Genetic correlations.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000100007

A short review: Comparisons of high-throughput phenotyping methods for detecting drought tolerance
Provedor de dados: 63
Autores: Kim,Jaeyoung; Kim,Ki-Seung; Kim,Yoonha; Chung,Yong Suk.
ABSTRACT Drought is a major threat worldwide for crop production, especially due to the rapid climate changes. Current drought solutions involve improving irrigation system, rainwater harvesting, damming, cloud seeding, and changes of cultivation methods. Despite effective, each solution has economic, environmental, and temporal drawbacks. Among all solutions, the most effective, inexpensive and manageable method is the use of drought-tolerant cultivars via plant breeding. However, conventional plant breeding is a time-consuming and laborious task, especially for phenotypic data acquisition of target traits of numerous progenies. High-throughput phenotyping (HTP) is a recently developed method and has potential to overcome the mentioned issues. HTP offers...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sensors; Remote sensing platforms; Image analysis; Drought solution; Plant breeding.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000401801

Seasonality of nutrients in leaves and fruits of apple trees
Provedor de dados: 63
Autores: Nachtigall,Gilmar Ribeiro; Dechen,Antonio Roque.
The nutrient accumulation curves of apple trees are good indicators of plant nutrient demand for each developmental stage. They are also a useful tool to evaluate orchard nutritional status and to estimate the amount of soil nutrient removal. This research aimed at evaluating the seasonality of nutrients in commercial apple orchards during the agricultural years of 1999, 2000, and 2001. Therefore, apple tree leaves and fruits of three cultivars 'Gala', 'Golden Delicious' and 'Fuji' were weekly collected and evaluated for fresh and dry matter, fruit diameter and macronutrient (N, P, K, Ca and Mg) and micronutrient (B, Cu, Fe, Mn, and Zn) concentrations. Leaf and fruit sampling started one or two weeks after full bloom, depending on the cultivar, and ended...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Malus domestica; Macronutrients; Micronutrients; Accumulation.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000500012

REPRODUÇÃO DE Meloidogyne incognita RAÇA 2 E DE Meloidogyne javanica EM OITO ESPÉCIES DE PLANTAS MEDICINAIS
Provedor de dados: 63
Autores: MACIEL,S.L.; FERRAZ,L.C.C.B.
Avaliaram-se as taxas reprodutivas de Meloidogyne incognita raça 2 e de Meloidogyne javanica em oito espécies de plantas consideradas medicinais, em vasos com 500 ml de solo, sob condição de casa de vegetação. Cada planta foi inoculada com 5000 ovos, em média, estabelecendo-se cinco repetições. Realizaram-se as avaliações após 45 a 55 dias das inoculações, com base nos índices de massas de ovos e nos fatores de reprodução dos nematóides. Achillea millefolium (mil-folhas), Arctium lappa (bardana), Bryophyllum calycinum (folha-da-fortuna) e Crassula portulacea (bálsamo) foram hospedeiras não eficientes ou desfavoráveis a ambas as espécies. Plectranthus barbatus (boldo) e Polygonum hidropiperoides (polígono) foram eficientes à reprodução das duas espécies....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Reprodução; Nematóides das galhas; Plantas medicinais.
Ano: 1996
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161996000200007

Temperature and pH of the nutrient solution on wheat primary root growth
Provedor de dados: 63
Autores: Camargo,Carlos Eduardo de Oliveira; Ferreira Filho,Antonio Wilson Penteado; Salomon,Marcus Vinicius.
Primary root growth is very important for wheat (Triticum aestivum L.) crop in upland conditions in the State of São Paulo. Fourteen wheat genotypes (mutant lines and cultivars) were evaluated for primary root growth during 7 and 15 days of development in complete and aerated nutrient solutions, in the laboratory. In the first experiment, solutions with three pH values (4.0, 5.0 and 6.0) at constant temperature (24 ± 1°C), and in the second experiment, solutions with the same pH (4.0) but with three temperatures (18°C ± 1°C, 24°C ± 1°C and 30°C ± 1°C) were used. High genetic variability was observed among the evaluated genotypes in relation to primary root growth in the first stages of development in nutrient solutions independent of pH, temperature and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Triticum aestivum L.; Upland crop; Root growth.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000300013

Baixa temperatura para explantes do porta-enxerto de macieira 'Marubakaido' in vitro durante a aclimatização
Provedor de dados: 63
Autores: Pereira,Jonny Everson Scherwinski; Fortes,Gerson Renan de Luces; Silva,João Baptista da.
O processo de aclimatização da macieira leva a uma parada no crescimento vegetativo das plantas que pode perdurar por alguns meses. Com o objetivo de maximizar o crescimento de plantas durante a aclimatização, brotações do porta-enxerto de macieira 'Marubakaido', originárias de cultivo in vitro, com 1,0 a 2,0 cm de comprimento, foram inoculadas e mantidas em meio "MS" por 0; 240; 480; 720; 960; 1200 e 1440 horas, sob temperatura de 4±1°C, fotoperíodo de 16 horas e intensidade luminosa de 4,2 µmoles m-2 s-1. O delineamento experimental utilizado foi em blocos casualizados com cinco repetições. Após os tratamentos, as brotações foram enraizadas e transplantadas para casa de vegetação, onde crescimento, número de gemas e comprimento dos entrenós foram...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Malus sp.; Micropropagação; Dormência; Aclimatação; Crescimento.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000200026

ANÁLISE DE REGRESSÃO EM EXPERIMENTOS EM PARCELAS SUBDIVIDIDAS COM DADOS NÃO-BALANCEADOS: UMA SOLUÇÃO NA LINGUAGEM GLIM
Provedor de dados: 63
Autores: PINHO,S.Z. de; MISCHAN,M.M.
São estabelecidas as matrizes necessárias para a realização da análise de variância de experimentos em parcelas subdivididas, com dados não-balanceados e balanceados, quando os tratamentos aplicados às parcelas e os tratamentos aplicados às subparcelas são ambos fatores quantitativos, usando a teoria de modelos lineares e de modelos lineares generalizados. Foi desenvolvido um programa computacional, na linguagem GLIM, para a realização da análise.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Experimentos não-balanceados; Parcelas subdivididas; Regressão; Glim.
Ano: 1996
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161996000100019

Estimating crop coefficients for corn during an evapotranspiration experiment on an oxisol in Brazil
Provedor de dados: 63
Autores: Villagra,M.M.; Gabriels,D.; Verplancke,H.; Hartmann,R.; Reichardt,K.
Soil water balance components were measured during two periods (from 1989 to 1991) on a Dark Red Latosol (oxisol) in Piracicaba,SP, Brazil. The change in soil water storage and the soil water fluxes at the lower limit of the rooting zone were calculated for a transect of 25 observation plots. Hydraulic head gradients were determined by tensiometer measurements. Soil water flux densities were estimated through Darcy's equation. The actual evapotranspiration of the crops and weeds and the actual evaporation of bare soil were obtained from the water balance equation and this for two periods under different crop rotations. For the first period the sequence was bare soil-corn-weeds and for the second period it was stubble mulch-weeds-corn. For assessing the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Crop coefficient; Evapotranspiration; Spatial variability.
Ano: 1994
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000200012

Soil tillage, water erosion, and calcium, magnesium and organic carbon losses
Provedor de dados: 63
Autores: Bertol,Ildegardis; Guadagnin,Jean Cláudio; González,Antonio Paz; Amaral,André Júlio do; Brignoni,Leonardo Felipe.
Soil tillage influences water erosion, and consequently, losses of calcium, magnesium and organic carbon in surface runoff. Nutrients and organic carbon are transported by surface runoff in particulate form, adsorbed to soil colloids or soluble in water, depending on the soil tillage system. This study was carried out on an Inceptisol, representative of the Santa Catarina highlands, southern Brazil, between November 1999 and October 2001, under natural rainfall. The soil tillage treatments (no replications) were: no-tillage (NT), minimum soil tillage with chiseling + disking (MT), and conventional soil tillage with plowing + two diskings (CT). The crop cycles sequence was soybean (Glycine max), oats (Avena sativa), beans (Phaseolus vulgaris) and vetch...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Runoff; Sediment; Nutrient in runoff; Nutrient in sediments; Nutrient losses.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000600011

Choosing components in the additive main effect and multiplicative interaction (AMMI) models
Provedor de dados: 63
Autores: Dias,Carlos Tadeu dos Santos; Krzanowski,Wojtek Janusz.
The additive main effect and multiplicative interaction (AMMI) models allows analysts to detect interactions between rows and columns in a two-way table. However, there are many methods proposed in the literature to determine the number of multiplicative components to include in the AMMI model. These methods typically give different results for any particular data set, so the user needs some guidance as to which methods to use. In this paper we compare four commonly used methods using simulated data based on real experiments, and provide some general recommendations.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Two-way table; Principal components; Simulation.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000200009

Conjugated linoleic acid of dairy foods is affected by cows’ feeding system and processing of milk
Provedor de dados: 63
Autores: Ruiz,Juan Pablo Avilez; Alonzo,Marcelo Wladimir; Pertíñez,Manuel Delgado.
ABSTRACT The distribution of conjugated linoleic acid (CLA) in dairy products commercially available in Chile is poorly understood. This study aimed to assess the content of CLA in dairy cow products from Chile and the effect of processing fresh milk into dairy products. Samples of raw milk were categorized into two groups based on the animal feeding system utilized by the dairy farm: 1) grazing based systems (Los Lagos region); and 2) housing systems using total mixed ration (TMR) diets (Los Angeles region). Simultaneously, commercial samples of condensed milk, powdered milk, butter and Gouda cheese were analyzed. Furthermore, samples of raw milk and processed products (powdered and sweetened condensed milk) were also analyzed. Dairy farms based on...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: CLA; Functional foods; Grazing; Milk quality.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000200103

Seasonal growth variation of peach palms cultivated in containers under subtropical conditions
Provedor de dados: 63
Autores: Tucci,Maria Luiza Sant'Anna; Bovi,Marilene Leão Alves; Machado,Eduardo Caruso; Spiering,Sandra Heiden.
Peach palm (Bactris gasipaes Kunth) is grown in the São Paulo State, Brazil, under climate seasonal variation conditions, mainly temperature and rainfal with possible effects on plant physiology. Recently, due to a higher interest in carrying out physiological experiments on the species, there has been a requirement for more controlled experimental conditions. Therefore, with the aim of studying the seasonal variation of peach palm growth for heart-of-palm production, as well as the possibility of growing them until harvest in pots, for future utilization in physiological experiments, this work was carried out in Campinas, SP, Brazil, with 40 spineless peach palms. One year after seed germination, seedlings were transplanted to 80 L plastic pots, spaced 2...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bactris gasipaes; Heart of palm; Growth analysis.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000200006

Genetic variability and vegetative compatibility of Erythricium salmonicolor isolates
Provedor de dados: 63
Autores: Sebastianes,Fernanda Luiza de Souza; Maki,Cristina Sayuri; Andreote,Fernando Dini; Araújo,Welington Luiz; Pizzirani-Kleiner,Aline Aparecida.
The Pink Disease is caused by Erythricium salmonicolor, which attacks broad hosts, such as citrus, coffee, rubber, Eucalyptus spp. and Acacia spp., infecting mainly branches. This disease became a serious problem in Brazil, reducing the citrus production up to 10%. However the genetic diversity and compatibility of the fungus E. salmonicolor from Brazilian citrus plants is not yet evaluated. Therefore, the aims of this study were to evaluate: i) the genetic variability of E. salmonicolor in the São Paulo and Minas Gerais States by the RAPD technique, and ii) the vegetative compatibility between these isolates. After RAPD analysis, six distinct groups were observed without correlation between the isolation site or host species. In the vegetative...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Corticium salmonicolor; RAPD; Pink Disease; Hyphal fusion; Heterokariosis.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000200009

Seed vigor testing: an overview of the past, present and future perspective
Provedor de dados: 63
Autores: Marcos Filho,Julio.
The assessment of seed vigor has many important implications to the seed industry as a basic monitoring of seed physiological potential during different phases of seed production and a support for strategic decisions regarding the selection of high quality seedlots to meet the consumer demand. The potential attributes of seed vigor as a fundamental physiological seed characteristic and its association with field stand establishment and crop productivity has been worldwide recognized from the 1960s onward. This led to the diversification of research approaches involving the synchronization of different physiological characteristics and events that determine the potential for high performance during seed storage and after sowing. The basic objective of vigor...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Seed physiology; Seed analysis; Quality control; Physiological potential.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162015000400363

Ocorrência de Distúrbios Fisiológicos em Manga, var. Tommy Atkins
Provedor de dados: 63
Autores: SAMPAIO,V.R.; SCARPARE FILHO,J.A.
Procurou-se determinar os fatores da relação planta/ambiente que predispõem frutos da variedade de manga Tommy Atkins a apresentarem distúrbios fisiológicos. Para isso, foram analisados os posicionamentos dos frutos na planta, estádios de maturação e a relação vigor do ramo/fruto. As avaliações permitiram concluir que: a) o posicionamento dos frutos na planta não tem influência alguma na ocorrência das desordens fisiológicas; b) existe certa relação entre vigor dos ramos e a presença dos distúrbios nos frutos; c) o percentual de ocorrência dos distúrbios fisiológicos é altamente influenciado pelo estádio de maturação do fruto à colheita, sendo que, é de pequena monta em frutos colhidos precocemente.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Manga; Distúrbios fisiológicos.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000100009

Estimating peach palm fruit surface area using allometric relationships
Provedor de dados: 63
Autores: Bovi,Marilene Leão Alves; Spiering,Sandra Heiden.
Fruit surface area is an important trait in studies of developmental physiology, as well as in entomological and phytopathological research, where damage caused by insects and/or microorganisms needs to be quantified. Nonetheless, direct measurement of this trait is difficult, not very precise and destructive. This study establishes allometric relationships to estimate the surface area of peach palm (Bactris gasipaes Kunth, Palmae) fruits. Five fruits were harvested, at different maturation stages, from each of 18 plants. Image digitalization and edition methodology was adapted and compared with the traditional gravimetric method. Regression analysis and curve fitting were used to compare the two methods and establish allometric relationships among fruit...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bactris gasipaes; Pejibaye; Area estimation; Curve fitting.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000400015

Sediment transport in runoff on rugous soil surface submitted to simulated rainfall
Provedor de dados: 63
Autores: Bertol,Ildegardis; Zoldan Junior,Wilson Antonio; González,Antonio Paz; Barbosa,Fabrício Tondello; Werner,Romeu de Suza.
Soil management influences water erosion and sediment size in runoff. With the objective of quantifying sediments in runoff and their relation to runoff velocity (Rv), random roughness (RR), and Ir index, this experiment was carried out from 2003 to 2006, on a typical Hapludox with the following soil management systems submitted to chiseling: i) bare soil with plowing+two disking tillage (BSC); ii) plowing+two disking tillage (CTC); iii) no tillage with crop residues burned (BNTC); and iv) traditional notillage (TNTC). CTC, BNTC and TNTC treatments were cultivated with crop rotation and the BSC treatment was not cultivated. Five simulated rainfall tests were applied, with intensity of 64 mm h-1 and duration of 20, 30, 40, 50 and 60 min. RR was influenced...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Water erosion; Chiseling; No-till; Sediment D50 index.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000500013

Forage yield and nutritive value of Panicum maximum genotypes in the Brazilian savannah
Provedor de dados: 63
Autores: Fernandes,Francisco Duarte; Ramos,Allan Kardec Braga; Jank,Liana; Carvalho,Marcelo Ayres; Martha Jr.,Geraldo Bueno; Braga,Gustavo José.
The narrow genetic variability of grasslands and the incidence of new biotic and abiotic stresses have motivated the selection of new Panicum maximum genotypes for use as forage for beef cattle in the Brazilian savannah. This study aimed to evaluate forage yield and nutritive value of P. maximum genotypes including 14 accessions (PM30 to PM43), four intraspecific hybrids (PM44 to PM47) and six cultivars (Aruana, Massai, Milênio, Mombaça, Tanzania and Vencedor), examining 24 genotypes over two years (2003 and 2004). Milênio cultivar was the genotype with the highest dry matter yield (DMY) in both years (18.4 t ha-1 and 20.9 t ha-1, respectively) although it presented a high proportion of stems (~ 30%). Genotypes that showed higher Leaf DMY in both years...
Tipo: Info:eu-repo/semantics/article
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162014000100003

Efeito do teor inicial de água de sementes de feijão e da câmara no teste de envelhecimento acelerado
Provedor de dados: 63
Autores: Scappa Neto,Angelo; Bittencourt,Sonia Regina Mudrovitsch de; Vieira,Roberval Daiton; Volpe,Clovis Alberto.
A temperatura interna das câmaras e o teor de água das sementes podem influenciar os resultados obtidos no teste de envelhecimento acelerado (EA) e, consequentemente, sua interpretação. O trabalho foi desenvolvido com o objetivo de avaliar o efeito de diferentes teores iniciais de água de sementes de feijão nos resultados do teste de envelhecimento acelerado e as condições de temperatura e umidade relativa do ar no interior de duas câmaras de envelhecimento e das caixas plásticas (câmaras internas), durante a condução do teste. Utilizaram-se amostras de quatro lotes de sementes de feijão, cujo teor de água inicial foi ajustado para 8, 10 e 12%. As sementes foram submetidas ao envelhecimento em câmaras "jaquetada" de água e de germinação tipo BOD. Durante a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phaseolus vulgaris; Teor de água inicial; Vigor.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000400016

Losses and gains of soil organic carbon in grasslands in the Brazilian semi-arid region
Provedor de dados: 63
Autores: Medeiros,Aldair de Souza; Maia,Stoécio Malta Ferreira; Santos,Thiago Cândido dos; Gomes,Tâmara Cláudia de Araújo.
ABSTRACT: Studies show that soil organic carbon (SOC) decreases between 3 % and 9 % in degraded grasslands in tropical regions, mainly due to the absence of techniques to enhance carbon contribution to soils. This study assessed SOC stock change factors for grassland management, specific to the semi-arid region of Brazil. These factors may contribute to a better understanding of SOC dynamics and could be used to improve inventories on GHG emissions. In addition, they could be used for updating default factors used by the Intergovernmental Panel on Climate Change. This study considers both soil sampling and a literature review, and comprises 27 paired comparisons, where the dataset was analyzed using a mixed linear model. For the grassland in the Brazilian...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Caatinga; Soil organic matter; Management factors; Degraded grasslands.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000301402

A simplified Excel® algorithm for estimating the least limiting water range of soils
Provedor de dados: 63
Autores: Leão,Tairone Paiva; Silva,Alvaro Pires da.
The least limiting water range (LLWR) of soils has been employed as a methodological approach for evaluation of soil physical quality in different agricultural systems, including forestry, grasslands and major crops. However, the absence of a simplified methodology for the quantification of LLWR has hampered the popularization of its use among researchers and soil managers. Taking this into account this work has the objective of proposing and describing a simplified algorithm developed in Excel® software for quantification of the LLWR, including the calculation of the critical bulk density, at which the LLWR becomes zero. Despite the simplicity of the procedures and numerical techniques of optimization used, the nonlinear regression produced reliable...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nonlinear regression; Spreadsheet software; Optimization; Soil physics; Soil quality.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000600013

Water-deficit tolerant classification in mutant lines of indica rice
Provedor de dados: 63
Autores: Cha-um,Suriyan; Yooyongwech,Suravoot; Supaibulwatana,Kanyaratt.
Water shortage is a major abiotic stress for crop production worldwide, limiting the productivity of crop species, especially in dry-land agricultural areas. This investigation aimed to classify the water-deficit tolerance in mutant rice (Oryza sativa L. spp. indica) genotypes during the reproductive stage. Proline content in the flag leaf of mutant lines increased when plants were subjected to water deficit. Relative water content (RWC) in the flag leaf of different mutant lines dropped in relation to water deficit stress. A decrease RWC was positively related to chlorophyll a degradation. Chlorophyll a , chlorophyll b , total chlorophyll , total carotenoids , maximum quantum yield of PSII , stomatal conductance , transpiration rate and water use...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ward cluster analysis; Drought tolerance; Fertile grain; Photosynthetic pigments; Water relation.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162012000200008

Spatial and temporal patterns of soil water content in an agroecological production system
Provedor de dados: 63
Autores: Neves,Hugo Hermsdorff das; Mata,Maria Gabriela Ferreira da; Guerra,José Guilherme Marinho; Carvalho,Daniel Fonseca de; Wendroth,Ole Otto; Ceddia,Marcos Bacis.
ABSTRACT: Spatial and temporal patterns of soil water content (SWC) can not only improve the understanding of soil water processes but also the water management in the field. The spatial distribution of SWC depends on the spatial variability of soil attributes, vegetation and landscape features. The aim of this study was to evaluate: i) the spatial and temporal variability pattern in an agroecological system; ii) understand the factors affecting the spatial variations of SWC; iii) determine if wet and dry zones conserve their spatial position; iv) evaluate the possibility of using this information to reduce the number of SWC measurements. The experiment was carried out in an area of 2,502 m2, where a regular grid with spacing of 10 m was laid out. At each...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: TDR; Time series; Spatial pattern; Temporal pattern; Agroecology.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162017000500383

Biochemical and physiological responses of sugarcane cultivars to soil water deficiencies
Provedor de dados: 63
Autores: Queiroz,Rafaela Josemara Barbosa; Santos,Durvalina Maria Mathias dos; Ferraudo,Antonio Sergio; Carlin,Samira Domingues; Silva,Marcelo de Almeida.
For sugarcane (Saccharum spp.) crops, the effects of an environmental stress, especially water deficiency, may cause severe productivity reduction, inferring negatively in the sugarcane industry. The tolerance of two sugarcane cultivars to a lack of water was made by analyzing the levels of the osmoprotectors, trehalose and free proline, and the biometrical variables of their initial growth. Biochemical and physiological responses of the cultivars, when subjected to water stress, were assayed to determine how these plants tolerate drought. The study was conducted in an acclimatized greenhouse (29.7 ± 4.3ºC and 75.0 ± 10.1% relative humidity) during 100 days and was divided into random blocks using a factorial 2 × 3 × 2 design (sugarcane cultivars × water...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Saccharum spp; Drought; Trehalose; Proline; Initial growth.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000400012

Resistance mechanisms of sugarcane cultivars to spittlebug Mahanarva fimbriolata
Provedor de dados: 63
Autores: Dinardo-Miranda,Leila Luci; Fracasso,Juliano Vilela; Perecin,Dilermando; Oliveira,Mariana Cecília de; Lopes,Diego Olympio Peixoto; Izeppi,Tiago Sabongi; Anjos,Ivan Antonio dos.
ABSTRACT The spittlebug Mahanarva fimbriolata (Stål) (Hemiptera: Cercopidae) is one of the most important pests of sugarcane in Brazil. Measures for population control are currently restricted to the use of chemical insecticides and fungus Metarhizium anisopliae, in part because very little information exists regarding resistance of sugarcane cultivars. Therefore, the aim of this study was to evaluate resistance mechanisms of 12 different sugarcane cultivars to M. fimbriolata to provide information for growers for pest management. Isolated buds of each cultivar were planted in pots and kept in a greenhouse for approximately three months. The pots were then moved to climate test chambers (26 ± 1 ºC; 70 ± 10 % relative humidity; 12 h photoperiod) to carry...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Saccharum spp.; Antixenosis; Antibiosis; Tolerance.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000200115

In situ degradability of corn stover and elephant-grass harvested at four stages of maturity
Provedor de dados: 63
Autores: Silva,Luis Felipe Prada e; Cassoli,Laerte Dagher; Roma Júnior,Luiz Carlos; Rodrigues,Ana Carolina de Oliveira; Machado,Paulo Fernando.
Among tropical forages, corn silage is largely used by farmers trying to explore the maximum genetic potential from the animals. However, other tropical forages, such as elephant-grass (Pennisetum purpureum), are more productive and therefore cheaper to use than corn silage. Our objective was to compare the in situ degradability of elephant-grass with that from corn hybrids, all harvested at four stages of maturity. The experimental design followed a randomized block design with nested subplots. Two corn hybrids: AG5011, ZN8392 were harvested with 25, 30, 35, and 40% dry matter (DM) in the whole plant, and separated in stem + leaf sheath + leaf blade (stover), and cobs. Elephant-grass was harvested with 30, 40, 50 and 60 days after a leveling cut. Dried...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pennisetum purpureum; Corn silage; Digestibility; Rumen; Tropical grass.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000600005

Extraction methods and availability of micronutrients for wheat under a no-till system with a surface application of lime
Provedor de dados: 63
Autores: Fonseca,Adriel Ferreira da; Caires,Eduardo Fávero; Barth,Gabriel.
Micronutrient availability can be affected by the increase of the soil pH due to surface liming. A field trial was carried out on a loamy, kaolinitic, thermic Typic Hapludox at Ponta Grossa, Paraná State, Brazil. The main objective was to evaluate the effects of surface liming and re-liming on the availability of micronutrients [copper (Cu), iron (Fe), manganese (Mn), and zinc (Zn)] for wheat (Triticum aestivum L.) cropped under a no-till system. A randomized complete block design was used in a split-plot arrangement. The main plots received surface lime applications (2, 4, and 6 Mg ha-1) in July 1993. In the subplots, surface lime (3 Mg ha-1) was applied again in June 2000. In 2003, before the wheat sowing, soil samples were taken at 0-5, 5-10, and 10-20...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Triticum aestivum L; Soil acidity; Dolomitic lime; Multinutrient extractants; Soil with variable charge.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000100009

Effect of ensiling time on apparent total tract starch digestibility in Southern Brazilian dairy herds
Provedor de dados: 63
Autores: Michelotti,Tainara Cristina de Abreu; Silva,Ricardo Antonio da; Carneiro,Jorge Henrique; Navarro,Rodrigo Barros; Carvalho,Igor Quirrenbach de; Paula,Eduardo Marostegan de; Ferraretto,Luiz Felipe; Caetano,Mariana; Lanna,Dante Pazzanese Duarte; Almeida,Rodrigo de.
ABSTRACT: Ensiling corn for longer periods is a strategy used to increase rumen bacteria access to starch. In fact, when corn is ensiled for insufficient periods, starch digestibility decreases, as evidenced by excreted starch. This study investigates the effects of corn silage ensiling time on starch digestibility of dairy cows through fecal starch analysis. The trial was conducted during the spring of 2013 and the fall of 2014 on twenty dairy herds located in the state of Paraná, southern Brazil. Total mixed ration (TMR), whole-plant corn silage (WPCS) and fecal samples were collected for determination of dry matter (DM), neutral detergent fiber (NDF), acid detergent fiber (ADF), lignin and starch. Apparent total tract starch digestibility (ATTSD) was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ensiling period; Fecal starch; Whole-plant corn silage.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000200401

Variações morfológicas de embriões somáticos obtidos a partir de inflorescências de bananeira
Provedor de dados: 63
Autores: Filippi,Silvia Balbão; Appezzato-da-Gloria,Beatriz; Rodriguez,Adriana Pinheiro Martinelli.
A embriogênese somática pode ser uma alternativa para o melhoramento de espécies vegetais, quando associada à transformação genética. A regeneração de plântulas a partir de embriões somáticos é dependente de vários fatores, entre eles, a qualidade do embrião somático. Neste trabalho embriões somáticos com diferentes características morfológicas são descritos. Embriogênese somática de bananeira, cv. Grand Nain e Nanicão Jangada foi induzida a partir de inflorescências funcionalmente masculinas, em meio de indução (MI) seguido de subcultivo em meio de germinação (MG), em ausência de luz. A presença de luz na indução, não favoreceu a resposta embriogênica. Em ausência de luz, os explantes da cv. Nanicão Jangada, durante os seis meses de cultivo, sofreram...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Musa spp.; Embriogênese somática; Cultura de tecidos; Histologia; Morfologia.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000400010

Electrochemical attributes and availability of nutrients, toxic elements, and heavy metals in tropical soils
Provedor de dados: 63
Autores: Fontes,Mauricio Paulo Ferreira; Alleoni,Luís Reynaldo Ferracciú.
Electrochemical properties of soils are very important for the understanding of the physico-chemical phenomena which affect soil fertility and the availability of nutrients for plants. This review highlights the electrochemical properties of tropical soils, the behavior and the availability of nutrients, toxic elements and heavy metals in the soil, especially for soils with predominant variable charge minerals. Availability of the elements is related to ionic exchange, solution speciation, and electrostatic and specific adsorptive soil properties. Empirical and surface complexation models are briefly described, and some results of their application in tropical soils are presented. A better understanding of the role of the double diffuse layer of charges...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Electric charge; Adsorption; Model; Ionic exchange; Speciation.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000600014

Saffron yield and quality as influenced by different irrigation methods
Provedor de dados: 63
Autores: Mollafilabi,Abdullah; Davari,Kamran; Dehaghi,Majid Amini.
ABSTRACT Dried stigma of saffron is the most expensive spice in the world. In Iran, the majority of saffron farms use the traditional basin method for irrigation, which, together with other irrigation methods may soon face serious problems because of droughts in the future. Making an evaluation of the regional crop response to the irrigation method is important to the adoption of a proper irrigation management strategy. In this study, the effect of employing different irrigation methods, including the sprinkler, drip, furrow, and basin, on the following factors was evaluated: the saffron stigma dry weight, quality, water use efficiency (WUE), and Irrigation water use efficiency (IWUE) in the arid climate of Qaen, South Khorasan, Iran, over three...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Crocin; Picrocrocin; Safranal; Drip irrigation; Water use efficiency.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000100603

N2O-reducing activity of soil amended with organic and inorganic enrichments under flooded conditions
Provedor de dados: 63
Autores: Księżopolska,Alicja; Włodarczyk,Teresa; Brzezińska,Małgorzata; Szarlip,Paweł; Pazur,Marek.
ABSTRACT Changes, apparent after investigation, in the physical and chemical properties in soil, as a result of organic and inorganic enrichments under flooded conditions, influence the growth of denitrifiers. The aim of this study was to determine the effect of the addition of manure (8 kg m−2) (M), clay (50 kg m−2) (CL) and lime (1.12 kg m−2) (Ca) on the N2O-reducing activity (N2O-RA) of sandy loam soil (clay content - 24 % in 0-20 cm), during NO3 reduction under flooding. The soil samples were taken from field plots after 3 years of enrichment with grass cultivation. The enrichments had a distinct effect on the N2O-RA and N2O-released, due to the change in pH, the porosity, and the sorptive properties of the soil. The pH had the greatest impact on the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: N2O/N2+N2O ratio; Clay and Ca-enrichments; Manure; Actual denitrification.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162017000400334

TÉCNICA DE MEDIÇÃO DE ÁREA FOLIARCONSUMIDA POR  INSETOS ATRAVÉS DE DIGITALIZADOR DE IMAGENS
Provedor de dados: 63
Autores: WILCKEN,C.F.; MORAES,R.C.B. de; HADDAD,M. de L.; PARRA,J.R.P.
Este trabalho teve por objetivo verificar a viabilidade do uso de digitalizador de imagens manual, acoplado a um microcomputador, para a avaliação do consumo de folhas de soja, por lagartas de 5o instar de Anticarsia gemmatalis Hübner (Lep.: Noctuidae), em comparação com o método de pesagem e do planímetro, baseando-se na eficiência dos métodos e no tempo gasto para a avaliação. Os testes foram realizados utilizando-se folhas de soja `IAC 8' e lagartas criadas em dieta artificial. Foram realizados 2 tipos de teste: 1o) oferecimento de folíolos inteiros de soja às lagartas e, 2o) oferecimento de disco de folhas de área conhecida. No 1o teste comparou-se o método de pesagem com o digitalizador de imagens ("scanner"); no 2o experimento foram comparados o...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Insecta; Medição de área foliar consumida; Lagarta da soja; Digitalizador de imagens.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000200008

Morphoagronomic variation in natural populations of Trifolium riograndense (Burkart)
Provedor de dados: 63
Autores: Conterato,Ionara Fatima; Dall'Agnol,Miguel; Schifino-Wittmann,Maria Teresa; Montardo,Daniel Portela; Pontalti,Gabriel Colombo; Almeida,Danielle.
Several species of Trifolium are widely cultivated as forage for animals and green manure. This work aimed to characterize and estimate through morphological and agronomic traits the genetic diversity of natural populations of T. riograndense, an important forage legume from native pastures of the state of Rio Grande do Sul, Brazil. Plant height and diameter, number of primary and secondary stolons, stolon length, number of nodes per primary stolon, internode length, primary stolon diameter, leaf area, petiole length and dry matter production were analyzed in 29 accessions. The first five attributes and dry matter production were evaluated twice. A broad phenotypic variability was observed for almost all characteristics. Positive correlations occurred...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Forage legume; Genetic variability; Morphology; Plant breeding.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000600009

Topography and spatial variability of soil physical properties
Provedor de dados: 63
Autores: Ceddia,Marcos Bacis; Vieira,Sidney Rosa; Villela,André Luis Oliveira; Mota,Lenilson dos Santos; Anjos,Lúcia Helena Cunha dos; Carvalho,Daniel Fonseca de.
Among the soil formation factors, relief is one of the most used in soil mapping, because of its strong correlation with the spatial variability of soil attributes over a landscape. In this study the relationship between topography and the spatial variability of some soil physical properties was evaluated. The study site, a pasture with 2.84 ha, is located near Seropédica, Rio de Janeiro State, Brazil, where a regular square grid with 20 m spacing was laid out and georreferenced. In each sampling point, altitude was measured and undisturbed soil samples were collected, at 0.0-0.1, 0.1-0.2, and 0.2-0.3 m depths. Organic carbon content, soil texture, bulk density, particle density, and soil water retention at 10 (Field Capacity), 80 (limit of tensiometer...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Terrain elevation; Geostatistics; Soil physics; Cross semivariance.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000300009

Yield and nitrogen fixation potential from white lupine grown in rainfed Mediterranean environments
Provedor de dados: 63
Autores: Sulas,Leonardo; Canu,Simone; Ledda,Luigi; Carroni,Antonio Melchiorre; Salis,Mauro.
ABSTRACT There is renewed interest in white lupine (Lupinus albus L.), which is appreciated for its high protein content, full range of essential amino acids and as N source to rainfed cropping systems. Unfortunately, information on its N2 fixation ability is limited. This study aimed to: (i) quantify the N2 fixation ability of white lupine crop at the plot field scale in three different environments of Sardinia (Italy) under Mediterranean climate; (ii) determine the allocation of the plant-fixed N into different organs; and (iii) establish the relationship between fixed N and DM within plant organs. In a 2-year experiment, N2 fixation was estimated using the 15N isotopic dilution method. The productive performances and ability of white lupine to fix N2...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lupinus albus cv. Multitalia; Fixed N; Isotopic dilution; Plant organs; Pulse.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000400338

Herbage utilisation efficiency of continuously stocked marandu palisade grass subjected to nitrogen fertilisation
Provedor de dados: 63
Autores: Pereira,Lilian Elgalise Techio; Paiva,Adenilson José; Guarda,Vitor Del’Álamo; Pereira,Priscila de Mesquita; Caminha,Fábio Olegário; Silva,Sila Carneiro da.
Nitrogen fertiliser accelerates plant growth and increases herbage utilisation efficiency in continuously stocked temperate grass swards, indicating greater herbage production and harvest efficiency. There is no similar evidence, however, for tropical pastures. In this study we evaluated the morphogenetic responses, the patterns of defoliation and the efficiency of herbage utilisation of continuously stocked marandu palisade grass (Brachiaria brizantha (Hochst. ex A. Rich.) Stapf. cv. Marandu) maintained at 30 cm by cattle and fertilised with nitrogen. Treatments corresponded to four measures of nitrogen application (0, 150, 300 and 450 kg ha–1), and were assigned to experimental units (1,200 m2 paddocks) according to a randomised complete block design,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brachiaria brizantha; Grazing management; Leaf turnover; Frequency and severity of defoliation.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162015000200114

Control of Meloidogyne paranaensis mediated by silicon
Provedor de dados: 63
Autores: Bicalho,Anderson Cascione Gripp; Silva,Santino Aleandro da; Machado,Andressa Cristina Zamboni.
ABSTRACT: The potential of silicon (Si) to control nematodes is often reported in association with the resistance induction mechanism. The objective of this work was to evaluate the hypothesis of resistance induction in plants against nematodes through the application of Si. In vitro experiments were carried out to evaluate the effect of Si and potassium chloride (KCl) on the hatching and mortality of Meloidogyne paranaensis juveniles. For the purpose of a greenhouse experiment, tomato plants were used as a model for bifurcated roots, using the respective control treatments, KCl and distilled water. Ten days after treatment, 2,000 eggs of M. paranaensis were inoculated. At 55 days post-inoculation, the reproduction factor and number of nematodes per gram...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Solanum lycopersicum; Management; Root-knot nematode.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000301601

Assessment of heavy metals in soils of a vineyard region with the use of principal component analysis
Provedor de dados: 63
Autores: Valladares,Gustavo Souza; Camargo,Otávio Antônio de; Carvalho,José Ruy Porto de; Silva,Alessandra Maria Cia.
Agricultural management with chemicals may contaminate the soil with heavy metals. The objective of this study was to apply Principal Component Analysis and geoprocessing techniques to identify the origin of the metals Cu, Fe, Mn, Zn, Ni, Pb, Cr and Cd as potential contaminants of agricultural soils. The study was developed in an area of vineyard cultivation in the State of São Paulo, Brazil. Soil samples were collected and GPS located under different uses and coverings. The metal concentrations in the soils were determined using the DTPA method. The Cu and Zn content was considered high in most of the samples, and was larger in the areas cultivated with vineyards that had been under the application of fungicides for several decades. The concentrations of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: PCA; GIS; Soil pollution; Copper; Zinc.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000300011

Characterization and classification of two soils derived from basic rocks in Pernambuco State Coast, Northeast Brazil
Provedor de dados: 63
Autores: Oliveira,Lindomário Barros de; Ferreira,Maria da Graça de Vasconcelos Xavier; Marques,Flávio Adriano.
Geomorphic surfaces that present soils derived from basic rocks under warm and humid climate are unique scenarios for studying tropical soils. This paper aimed to characterize and classify two pedons derived from basalt at the Atlantic Forest Zone, Pernambuco State, Northeastern coast of Brazil. Two representative pedons (P1 and P2) were selected on a hillslope at the Cabo de Santo Agostinho municipality. Field macromorphological descriptions were carried out and soil horizon were sampled for physical, chemical, mineralogical and micromorphological characterization. The soils were classified, according to the Brazilian System of Soil Classification (and US Soil Taxonomy) as: "Latossolo Vermelho-Amarelo distroférrico argissólico" (Typic Hapludox) (P1) and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Red Nitisol; Red-Yellow Latosol; Cabo de Santo Agostinho; Tropical soils.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000600009

Atividade da enzima redutase do nitrato em algodoeiro submetido ao déficit hídrico e posterior recuperação da turgescência
Provedor de dados: 63
Autores: Marur,Celso Jamil; Mazzafera,Paulo; Magalhães,Antonio Celso.
A atividade da redutase do nitrato foi estudada em plantas de algodão (Gossypium hirsutum, L.), cvs IAC 20 e IAC 13-1, submetidas a déficits crescentes de água, e posterior recuperação da turgescência. A atividade fisiológica das folhas, representada pela atividade da enzima, sofreu redução quando o y a foi menor que -1,5 MPa. Não ocorreram diferenças significativas entre os dois cultivares em relação ao estabelecimento do estresse, nem tampouco quanto ao padrão de recuperação da turgescência em plantas estressadas. O ensaio in vivo da atividade da redutase do nitrato mostrou ser um método sensível para a avaliação do efeito do estresse hídrico sobre o crescimento das plantas, constituindo-se em um parâmetro indicativo do nível geral do metabolismo na...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gossypium hirsutum; Potencial total da água.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000200013

Effect of some vitamins and micronutrient deficiencies on the production of higher alcohols by Saccharomyces cerevisiae
Provedor de dados: 63
Autores: Gutierrez,L.E.
A study was carried out in order to determine the effect of vitamins (biotin, thiamine, pantotheniic acid and pyridoxal) and micronutrient (zinc, boron, manganese and iron) deficiencies on higher alcohol production during alcoholic fermentation with the industrially used yeast Saccharomyces cerevisiae M-300-A. Zinc deficiency induced a reduction on the levels of isobutyl and isoamyl alcohols. An increase on isobutyl alcohol (fivefold) and a reduction of isoamyl alcohol (two fold) and n-propyl alcohol (three fold) contents resulted from pantotheiiic acid deficiency, whereas pyridoxal deficiency caused an increase on the levels of isobutyl and isoamyl alcohols. Biotin was not essential for the growth of this strain.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vitamins; Saccharomyces; Yeasts; Micronutrient; Higher alcohols; Alcoholic fermentation.
Ano: 1993
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161993000300024

Genetic analysis for sooty mold resistance and heart of palm yield in Archontophoenix
Provedor de dados: 63
Autores: Bovi,Marilene Leão Alves; Resende,Marcos Deon Vilela de; Sáes,Luís Alberto; Uzzo,Roberta Pierry.
Archontophoenix palms, utilized both as ornamental species and as a source of high-quality heart of palm, are susceptible to sooty mold, a disease coupled with aphid infestation, which affects photosynthesis and causes unpleasant, darkish palm appearance. Scoring rates for sooty mold resistance and three growth traits were assessed under field conditions in 24 open-pollinated half-sibs families, 28 months after planting, aiming to identify genetic variability for sooty mold resistance; estimate genetic parameters for this trait and plant height, diameter and number of leaves; estimate genetic and phenotypic correlation for the four traits and evaluate selection methods for heart of palm production through multi-trait index selection based on growth traits....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Capnodium; Cerataphis; Genetic gain; Heritability; King palm.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000200009

Optimization of banana plantlets acclimatization by hydroponic cultivation
Provedor de dados: 63
Autores: Toyosumi,Iumi da Silva; Silva,Tibério Santos Martins da; Melo,Diego Magalhães; Azevedo Neto,André Dias de; Soares,Tales Miler; Coelho Filho,Maurício Antonio.
ABSTRACT: Acclimatization is the final phase of banana plantlet production by micropropagation. In this phase, the plantlets are grown in a protected environment with high demand for water, fertilizer and labor, until reaching the standard size and quality required for marketing. The aim of this study was to evaluate the possibility of reducing these costs and the duration of the acclimatization phase, using the hydroponic cultivation technique as compared to the conventional system. ‘Prata–Anã’ banana plantlet performance was measured for both systems under both tropical summer and winter conditions, based upon water and nutrient use efficiency and growing time of the plantlets. In both seasons, the plantlets produced hydroponically presented faster...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Musa spp.; Soil-less cultivation; Water use efficiency; Growth.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000700101

Genetic control of cowpea seed sizes
Provedor de dados: 63
Autores: Lopes,Francisco Cláudio da Conceição; Gomes,Regina Lúcia Ferreira; Freire Filho,Francisco Rodrigues.
Cowpea [Vigna unguiculata (L.) Walp.] is one of the most widely adapted grain legumes in hot regions of Africa, Asia and the Americas. In the semiarid Northeast of Brazil, it is the main subsistence crop, an excellent protein source of low cost, for the poor population. The objective of this work was to estimate genetic parameters to understand the inheritance of seed sizes in cowpea. The parents P1 and P2 and the generations, F1, F2, BC1 and BC2 of the cross TVx5058-09C X Manteiguinha formed the genetic material for this study. These six generates (P1, P2, F1, F2, BC1 and BC) were evaluated in a completely randomized block-design with six replications, in Teresina - PI, Brazil, in 1998. The genetic parameters estimated were: phenotypic and total genetic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vigna unguiculata; 100-seed weight; Inheritance; Gene effect.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000200016

Narasin inclusion for feedlot lambs fed a diet containing high amounts of ground flint corn
Provedor de dados: 63
Autores: Polizel,Daniel Montanher; Marques,Samuel Sutil; Westphalen,Mariana Fontana; Gouvea,Vinícius Nunes; Ferraz Júnior,Marcos Vinícius de Castro; Miszura,Alexandre Arantes; Barroso,José Paulo Roman; Limede,Arnaldo Cintra; Ferreira,Evandro Maia; Pires,Alexandre Vaz.
ABSTRACT: Narasin is an antibacterial agent that may change rumen fermentation. Two experiments were proposed to evaluate the efficiency of narasin inclusion for lambs fed a diet containing high amounts of ground flint corn. Thirty rumen-cannulated wethers were used to evaluate nutrient digestibility, nitrogen balance, and rumen metabolism (Exp. 1); and forty-five lambs were used to evaluate performance (Exp. 2) of animals fed with narasin for high flint corn diets. The experimental diets were: control or basal diet without additives (C); 25 mg of monensin kg−1 of dry matter (DM) (M); and inclusion of 5 (N5), 10 (N10), and 15 (N15) mg of narasin kg−1 of DM. The statistical analyses were performed using the MIXED procedure of SAS. Monensin increased DM...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Average daily gain; Feed efficiency; Propionate; Rumen metabolism; Sheep.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000600401

Ensaios de combate ao cupim de monte Cornitermes cumulans (Kollar, 1832) (Isoptera, Termitidae)
Provedor de dados: 63
Autores: Mariconi,F.A.M.; Galan,V.B.; Rocha,M.T.; Maule,R.F.; Passos,H.R.; Silva,R.A.A.
Com a finalidade de combater o cupim de monte Cornitermes cumulans, importante espécie invasora, foram instalados dois campos experimentais. Experimento I: 60 ninhos foram escolhidos e medidos externamente. O ensaio constou de 6 tratamentos com 10 repetições: A) abamectina (50 cm³ CE 1,8%); B) silafluofem (200 cm³ CE 80%); C) silafluofem (400 cm³ CE 80%); D) fipronil (15g G 2%); E) fipronil (20g G 2%); F) clorpirifós (30g G 0,125%). Nos tratamentos A, B, C, as quantidades entre parênteses são da formulação comercial em 100 litros de água. Em D, E, F, são do granulado para cada ninho. Dos líquidos, usou-se um litro de calda por monte. A demolição dos montes deu-se após 103 dias da aplicação. Os melhores resultados foram obtidos com a abamectina e fipronil....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cupim de monte; Cornitermes cumulans; Inseticidas granulados.
Ano: 1994
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000300022

Marker assisted identification of tospovirus resistant tomato genotypes in segregating progenies
Provedor de dados: 63
Autores: Nascimento,Ildon Rodrigues do; Maluf,Wilson Roberto; Figueira,Antônia Reis; Menezes,Cícero Beserra; Resende,Juliano Tadeu Vilela de; Faria,Marcos Ventura; Nogueira,Douglas Willian.
The SCAR (Sequence Characterized Amplified Region) 'Sw-421' molecular marker is located at 1.0 cM from the Sw-5 allele, originated from Lycopersicon peruvianum (L.), which confers resistance to the tomato spotted wilt virus (TSWV). However, it had not been tested yet in advanced tomato populations. The goal of this study was to distinguish resistant homozygotes (Sw-5/Sw-5) and heterozygotes (Sw-5/Sw-5+) from susceptible (Sw-5+/Sw-5+) plants in crossing populations with the Stevens cultivar and advanced backcrossing populations by using 'Sw421' SCAR marker. The amplification of 940 bp and 900 bp bands characterized the resistant homozygotes and susceptible controls, respectively. A two band pattern (900 bp and 940 bp) was observed in heterozygote genotypes...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lycopersicon esculentum; Sw-5; Vírus resistance; Molecular marker.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000300003

Immunocastration on performance and meat quality of Bos indicus (Nellore) cattle under different nutritional systems
Provedor de dados: 63
Autores: Jacinto-Valderrama,Rickyn Alexander; Sampaio,Guilherme Sicca Lopes; Lima,Maria Lucia Pereira; Cyrillo,Joslaine Noely dos Santos Gonçalves; Pflanzer,Sergio Bertelli.
ABSTRACT: The present study aimed to evaluate the effects of immunocastration on the animal growth, carcass traits, and meat quality of Nellore cattle receiving or not Ionophore supplementation at pasture or pasture with concentrate (semi-feedlot). The first experiment (Pasture) was carried out during the rainy season, while the second (supplemented = Semi-feedlot) was conducted during the dry season. In each assessment, 60 males were allocated into three treatments, in a completely randomized design: non-castrated, immunocastrated (anti-gonadotropin-releasing hormone vaccine), and immunocastrated animals receiving ionophore. The highly energetic supplemented diet was prepared using 85 % corn and 10 % soybean meal at 1 % body weight, while the ionophore...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: DFD; Beef tenderness; Marbling; Grown performance; Ionophores.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000200901

RENDIMENTO DE BENEFÍCIO E DE GRÃOS INTEIROS EM FUNÇÃO DO ESPAÇAMENTO E DA DENSIDADE DE SEMEADURA DO ARROZ DE SEQUEIRO
Provedor de dados: 63
Autores: Crusciol,Carlos Alexandre Costa; Machado,José Ricardo; Arf,Orivaldo; Rodrigues,Ricardo Antonio Ferreira.
O presente trabalho teve por objetivo estudar o efeito do espaçamento entre fileiras (30, 40 e 50 cm) e da densidade de semeadura (100, 150 e 200 sementes viáveis/m2) quanto a qualidade industrial de grãos do arroz de sequeiro cv. IAC 201. Dessa forma, foi instalado um experimento em condições de campo, em um Latossolo Vermelho escuro, epi-eutrófico, textura argilosa, em Selvíria, MS. Para tanto, foram avaliados os rendimentos de grãos, no benefício, grãos inteiros e quebrados. A variação do espaçamento e da densidade de semeadura não afetou o rendimento de benefício. O aumento da densidade de semeadura aumentou a porcentagem de grãos quebrados. Os rendimentos de grãos inteiros e quebrados não foram influenciados pela variação do espaçamento entre fileiras.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Espaçamento entre fileiras; Densidade de semeadura; Arroz de sequeiro; Rendimento de benefício; Rendimento de grãos inteiros.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000100008

How accurate are pedotransfer functions for bulk density for Brazilian soils?
Provedor de dados: 63
Autores: Boschi,Raquel Stucchi; Bocca,Felipe Ferreira; Lopes-Assad,Maria Leonor Ribeiro Casimiro; Assad,Eduardo Delgado.
ABSTRACT: The aim of this study was to evaluate the performance of pedotransfer functions (PTFs) available in the literature to estimate soil bulk density (ρb) in different regions of Brazil, using different metrics. The predictive capacity of 25 PTFs was evaluated using the mean absolute error (MAE), mean error (ME), root mean squared error (RMSE), coefficient of determination (R2) and the regression error characteristic (REC) curve. The models performed differently when comparing observed and estimated ρb values. In general, the PTFs showed a performance close to the mean value of the bulk density data, considered as the simplest possible estimation of an attribute and used as a parameter to compare the performance of existing models (null model). The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: REC curve; Model evaluation; Soil database; Tropical soil.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162018000100070

Número de microrganismos e atividade da urease na presença de aldicarbe e endosulfan no solo
Provedor de dados: 63
Autores: Santos,T.M.C.; Monteiro,R.T.R.
Avaliou-se o efeito de duas concentrações de inseticidas nematicida aldicarbe e do inseticida acaricida endosulfan na população microbiana do solo, através das técnicas de diluição em série e plaqueamento, e através da medida da atividade da enzima urease. Houve um decréscimo na população de actinomicetos com 2ppm de aldicarbe, entretanto com 20 ppm também para endosulfan, a população desses microrganismos aumentou. Para bactérias a adição de aldicarbe nas duas concentrações resultou em decréscimo da população; no entanto, para 2 ppm verificou-se recuperação no final do bioensaio e, para 20 ppm o efeito foi considerado irreversível. Na presença de endosulfan verificou-se acréscimo da população bacteriana. Aldicarbe não mostrou ter efeito significativo na...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aldicarbe; Endosulfan; Microrganismos; Urease.
Ano: 1994
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000100019

Fungo Metarhizium anisopliae e o controle de Frankliniella occidentalis em alface hidropônico
Provedor de dados: 63
Autores: Lopes,Rogério Biaggioni; Alves,Sérgio Batista; Tamai,Marco Antonio.
O tripes Frankliniella occidentalis (Pergande) provoca grandes prejuízos em cultivos comerciais de alface, através do dano direto, durante a alimentação no tecido vegetal, e pela transmissão de virose. O desenvolvimento de novas estratégias de controle da praga em cultivos protegidos vem se tornando necessária em função dos problemas acarretados pelo uso constante de inseticidas químicos. Foi avaliada a eficiência de pulverizações do fungo Metarhizium anisopliae (Metsch.) Sorokin (isolado 1104) nas concentrações 5x10(6) e 1x10(8) conídios ml-1, visando o controle da praga em cultivos de alface hidropônico. A eficiência de controle do fungo nas duas concentrações chegou a 60%, seis dias após a primeira pulverização. Nas parcelas que não receberam o...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Tripes; Controle microbiano.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000200007

In vitro seed germination and seedling development of Annona crassiflora Mart.
Provedor de dados: 63
Autores: Ribeiro,Márcia de Nazaré Oliveira; Pasqual,Moacir; Villa,Fabíola; Pio,Leila Aparecida Salles; Hilhorst,Henk William Maria.
Annona crassiflora Mart known as 'araticum', 'marolo' or 'field araticum' is a typical fruit from the Cerrado biome of Brazil with socio-economic and medicinal importance. Normally, Annona crassiflora is propagated through seeds. However, due to a deep dormancy that the seeds display at dispersion and the difficulty to obtain uniform plants in a short time period, micropropagation may be a feasible alternative. Concentrations of gibberellic acid (GA3) and naphthalene-acetic acid (NAA) and their interactive effects on in vitro seed germination and seedling development of Annona crassiflora were studied. Mature fruits of Annona crassiflora were depulped and the seeds washed in clear water and dried at room temperature. Seed coat was removed and the seeds...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Tissue culture; Culture medium; Growth regulators.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000300017

Physiological model to estimate the maturity of sugarcane
Provedor de dados: 63
Autores: Scarpari,Maximiliano Salles; Beauclair,Edgar Gomes Ferreira de.
Sugarcane (Saccharum spp.) grows in different weather and management conditions which directly affect crop maturation. These conditions lead to the necessity of quantifying crop response to different stimuli for planning purposes. Forecast models for the quality of raw material are important tools in sugarcane farming, especially the forecast curve of sucrose accumulation in shoots. The goal of these models is to supply yield estimates during the crop cycle, aiming to characterize alternatives and to increase the efficacy for management and strategic decisions. The objective of this project was to develop empiric models capable of obtaining estimates of total recoverable sugar (TRS), for the varieties RB72454, SP81-3250 and SP80-1842 during the crop cycle,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Climatology; Crop models; Productivity; Regression; Sucrose.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000500006

In vitro culture from mature seeds of Passiflora species
Provedor de dados: 63
Autores: Guzzo,Flavia; Ceoldo,Stefania; Andreetta,Filippo; Levi,Marisa.
The genus Passiflora comprises hundred species, mainly native of the South American tropics and rainforests, which are grouped into 21 subgenera. Some species are widely studied for their economic importance and are chiefly cultivated for production of fruit juice. To obtain a continuous source of material for a screening of secondary metabolites, zygotic embryo culture was attempted for 62 Passiflora species, starting from seeds mainly collected in the wild. Twenty nine of these species produced calli, which had very different growth rates. Plants were successfully regenerated from calli of 13 different species. For 25 of the responsive species this is the first report of in vitro culture.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Passiflora regeneration; Embryo culture; Endosperm culture; Ethnobotanical species; Plant acclimatization.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000100018

Phytase enzyme in diets containing defatted rice bran for growing swine
Provedor de dados: 63
Autores: Moreira,José Aparecido; Vitti,Dorinha Miriam Silber Schmidt; Trindade Neto,Messias Alves da; Lopes,João Batista.
Organic phosphorus is poorly utilized by monogastric animals because they lack phytase, the enzyme that cleaves the ortho-phosphate groups from the phytate molecule. Diets fed to pigs are supplemented with inorganic P, and this can increase environmental pollution and diet costs. Sixty mixed sex, half-breed pigs, were used to evaluate the effect of increasing dietary levels of phytase (253, 759, 1265 and 1748 PU kg-1 feed) on animal performance as compared to a control without phytase but supplemented with dicalcium phosphate. Enzyme levels did not affect daily feed intake, food conversion, average daily weight gain, plasma P and Ca, calcium and phosphorus in bone ash, and the calcium/phosphorus ratio in the plasma and bones. A quadratic relationship...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Environmental pollution; Nutrition; Performance; Phosphorus; Phytate.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000400004

Estimation of soil phosphorus availability via visible and near-infrared spectroscopy
Provedor de dados: 63
Autores: Souza,Micael Felipe de; Franco,Henrique Coutinho Junqueira; Amaral,Lucas Rios do.
ABSTRACT: Spectroscopic techniques have great potential to evaluate soil properties. However, there are still questions regarding the applicability of spectroscopy to analyze soil phosphorous (P) availability, especially in tropical soils with low nutrient contents. Therefore, this study evaluated the possibility to estimate P availability in soil and its pools (labile, moderately labile and non-labile) via Vis-NIR spectroscopy based on intra-field calibration. We used soils from two different locations, a plot experiment that received application of phosphate fertilizers (Field-A) and a cultivated field where a grid soil sampling was performed (Field-B). We used the technique of diffuse reflectance in the visible and near-infrared (Vis-NIR) to obtain the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Predictive modeling; Classification model; Precision agriculture; Fractionation of phosphorus; Soil fertility.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000501601

Efeitos da irrigação por gotejamento na produção de pimentão (Capsicum annuum L.) em casa-de-vegetação
Provedor de dados: 63
Autores: Teodoro,R.E.F.; Oliveira,A.S. de; Minami,K.
O presente trabalho teve como objetivo verificar os efeitos de diferentes níveis de água, aplicada na forma de gotejamento, em cultura de pimentão (Capsicum annuum L.) em condições de casa-de-vegetação coberta com lençol de polietileno. O cultivar utilizado foi "Agronômico 10G". O delineamento empregado foi inteiramente ao acaso, com quatro tratamentos e oito repetições. As irrigações eram feitas quando consumidos 10; 30; 50 e 70% da água disponível no solo para os respectivos tratamentos. O controle das irrigações baseou-se na evaporação do tanque "Classe A". O tratamento que era irrigado, quando haviam sido consumidos 30% de água disponível, apresentou uma tendência de elevar a produção, qualidade dos frutos e desenvolvimento vegetativo do pimentão. As...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Irrigação; Pimentão; Casa-de-vegetação; Gotejamento.
Ano: 1993
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161993000200011

Principles of crop modelling and simulation: III. modeling of root growth and other belowground processes, limitations of the models, and the future of modeling in agriculture
Provedor de dados: 63
Autores: DOURADO-NETO,D.; TERUEL,D. A.; REICHARDT,K.; NIELSEN,D.R.; FRIZZONE,J. A.; BACCHI,O.O.S.
The first models of temporal variation of root systems appeared over 20 years ago. The complex architectural geometry of root systems; the wide range in size and diameter and the rapid growth and decomposition of finest roots; the different physiological activity of roots of different ages; the complex microbial processes occurring at the root-soil interface; the symbiotic relationships in the rhizosphere; the variable soil environment (physical, chemical and biological) in which roots develop are the challenges of quantifying the root growth. The models are not simple mechanisms to archive information in order to produce forecasts. Modeling represents a better way of synthesizing knowledge about different components of a system, summarizing data, and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Crop modeling; Simulation.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000500010

Growth indices ans productivity in sugarcane
Provedor de dados: 63
Autores: Simões,Maurício dos Santos; Rocha,Jansle Vieira; Lamparelli,Rubens Augusto Camargo.
A knowledge about the temporal development of agronomic variables in sugarcane is a very important aspect for the development of crop yield prediction models using remote sensing, and further studies are still needed. This paper describes the temporal evolution of sugarcane biophysical parameters, such as total biomass, leaf area index, number of plants per meter, and productivity. During two seasons, a commercial field in Araras/SP, planted with variety SP80-1842, on the 4th and 5th cuts, was monitored on eight different dates, and data were obtained for 2 m of sugarcane in three crop rows at 18 sampling points. Linear and multiple regression analyses were used to study growth analysis and to correlate agronomic variables (leaf area index and number of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biomass; Leaf area index; Crop temporal evolution.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000100005

Sward structure and livestock performance in guinea grass cv: Tanzania pastures managed by rotational stocking strategies
Provedor de dados: 63
Autores: Euclides,Valéria Pacheco Batista; Montagner,Denise Bataglin; Difante,Gelson dos Santos; Barbosa,Rodrigo Amorim; Fernandes,Wellington Souza.
Grazing strategy is a key element in the determination of sward structure, herbage nutritive value and animal performance. We aimed to compare the herbage characteristics and performance of livestock in pastures of Panicum maximum cv. Tanzania managed, using two rotational stocking strategies, which provided either a fixed-length rest period (FRP) of 35 days in the spring and fall and 30 days in the summer, or a variable-length rest period (VRP), determined by the time required for the canopy to achieve 70 cm in height. The pastures were evaluated in the pregrazing condition for forage mass (FM); leaf (LP), stem (SP) and dead matter (DP) percentages; and nutritive value (NV). The animals were weighed every 28 days. Pastures managed with the FRPs exhibited...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Panicum maximum; Canopy height; Nutritive value; Savannah; Stocking rate.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162014000600002

Mechanically separated meat of broiler breeder and white layer spent hens
Provedor de dados: 63
Autores: Trindade,Marco Antonio; Felício,Pedro Eduardo de; Castillo,Carmen Josefina Contreras.
There are aproximately 90 millions of hens housed in Brazil, that concluding their production cycle, become available for slaughter. The poultry industry has economical interest in the use of spent hen meat through adequate processes. This review evaluates the quality of mechanically separated spent hen meat by chemical and functional characteristics, such as proximate composition, colagen, cholesterol, bones, calcium and iron contents, fatty acid profile, pH and emulsifying capacity, and as raw material for sausage production. The mechanical separation of meat migth be a good alternative use for spent hen carcasses.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: MSM; Chemical composition; Cholesterol; Functional characteristics.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000200018

Uso da análise faunística de insetos na avaliação do impacto ambiental
Provedor de dados: 63
Autores: Silveira Neto,S.; Monteiro,R.C.; Zucchi,R.A.; Moraes,R.C.B. de.
Com o objetivo de avaliar o impacto ambiental ocorrido na área experimental do Departamento de Entomologia - ESALQ/USP, num período de 25 anos, aplicou-se a análise faunística aos resultados da coleta de insetos, com armadilha luminosa, em 1965/66 e 1990/91. Comparando-se os índices fisiográficos das épocas estudadas, verifica-se uma redução de 35,1% entre 1965/66 e 1990/91. Como conseqüência, o índice de diversidade também diminuiu em 60,3% nas datas estudadas, em decorrência da menor coleta de insetos, caracterizando considerável impacto ambiental.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Índices faunísticos; Armadilha luminosa; Ambiente.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000100003

Genome association study through nonlinear mixed models revealed new candidate genes for pig growth curves
Provedor de dados: 63
Autores: Silva,Fabyano Fonseca e; Zambrano,Maria Fernanda Betancur; Varona,Luis; Glória,Leonardo Siqueira; Lopes,Paulo Sávio; Silva,Marcos Vinícius Gualberto Barbosa; Arbex,Wagner; Lázaro,Sirlene Fernandes; Resende,Marcos Deon Vilela de; Guimarães,Simone Eliza Facioni.
ABSTRACT: Genome association analyses have been successful in identifying quantitative trait loci (QTLs) for pig body weights measured at a single age. However, when considering the whole weight trajectories over time in the context of genome association analyses, it is important to look at the markers that affect growth curve parameters. The easiest way to consider them is via the two-step method, in which the growth curve parameters and marker effects are estimated separately, thereby resulting in a reduction of the statistical power and the precision of estimates. One efficient solution is to adopt nonlinear mixed models (NMM), which enables a joint modeling of the individual growth curves and marker effects. Our aim was to propose a genome association...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: SNP markers; Body weight; Longitudinal data.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162017000100001

Efeito do cultivo contínuo da cana-de-açúcar em propriedades físicas de um Latossolo Vermelho Escuro
Provedor de dados: 63
Autores: Oliveira,J.C.M. de; Vaz,C.M.P.; Reichardt,K.
Com o objetivo de estudar as características físicas do solo, sob monocultura, o presente trabalho avaliou a distribuição de tamanho de partículas, presença de camadas compactadas, porosidade total, macro e microporosidade de um latossolo vermelho escuro cultivado com cana-de-açúcar. As observações foram feitas em 1992-1993 utilizando amostras de solo sob vegetação natural de floresta e sob cultivo contínuo por 16, 30 e 50 anos. Amostras foram coletadas em camadas de 10 cm até a profundidade de 1 m. Os resultados indicam variações significativas do teor de argila dos horizontes superficiais em função do tempo de cultivo e bem como aumentos da densidade do solo, para as parcelas cultivadas. Variações também foram encontradas para a macro e microporosidade,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cultivo contínuo; Monocultura; Distribuição de partículas; Cana-de-açúcar; Latossolo vermelho escuro.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000100009

Sugarcane yield estimates using time series analysis of spot vegetation images
Provedor de dados: 63
Autores: Fernandes,Jeferson Lobato; Rocha,Jansle Vieira; Lamparelli,Rubens Augusto Camargo.
The current system used in Brazil for sugarcane (Saccharum officinarum L.) crop forecasting relies mainly on subjective information provided by sugar mill technicians and on information about demands of raw agricultural products from industry. This study evaluated the feasibility to estimate the yield at municipality level in São Paulo State, Brazil, using 10-day periods of SPOT Vegetation NDVI images and ECMWF meteorological data. Twenty municipalities and seven cropping seasons were selected between 1999 and 2006. The plant development cycle was divided into four phases, according to the sugarcane physiology, obtaining spectral and meteorological attributes for each phase. The most important attributes were selected and the average yield was classified...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: NDVI; Remote sensing; Data mining; Crop forecasting.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000200002

Soil microbial biomass under mulch types in an integrated apple orchard from Southern Brazil
Provedor de dados: 63
Autores: Almeida,Denice de Oliveira; Klauberg Filho,Osmar; Almeida,Henrique Cesar; Gebler,Luciano; Felipe,Aline Franciane.
The use of mulching is an alternative to control weeds but there are few studies on its effect on soil quality. In this sense, this study aimed to evaluate the effect of types of mulching on the attributes of microbial carbon, nitrogen and phosphorus in a Typic Hapludox with production of integrated apples in southern Brazil. The experiment was conducted in randomized blocks in the Vacaria, state of Rio Grande do Sul, southern Brazil. The soil mulch types studied were: pine needle, sawdust, black plastic and a control. The soil samples were collected in February (summer) and August (winter) of 2006, and the attributes related to total organic and microbial carbon, nitrogen and phosphorus were determined. Organic mulchings (pine needle and sawdust) promoted...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Microbial carbon; Soil cover; Microbial compartments; Microorganisms; Organic mulch.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000200012

Adubação nitrogenada do milho em um sistema de irrigação por aspersão em linha
Provedor de dados: 63
Autores: Mendonça,Fernando Campos; Medeiros,Roberto Dantas de; Botrel,Tarlei Arriel; Frizzone,José Antonio.
Foi avaliado o efeito do nitrogênio na cultura do milho através da fertirrigação, utilizando um sistema de irrigação por aspersão em linha e uréia como fonte de N. O sistema de aspersão em linha foi constituído por 3 linhas com cinco aspersores cada uma, cujo espaçamento foi de 6 metros entre si e 12 metros entre as linhas. O fertilizante foi aplicado nas linhas externas e a linha central aplicou apenas água. A lâmina de água total aplicada durante o ciclo foi de 650 mm. Essa aplicação foi feita de forma uniforme, e as doses de nitrogênio foram decrescentes na direção perpendicular às linhas externas de aspersores, variando de 353 a 30 kg/ha de N. Os resultados obtidos mostraram que as diferentes dosagens de nitrogênio afetaram os seguintes parâmetros...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fertirrigação; Adubação nitrogenada; Milho; Aspersão em linha.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000500004

Fate of nitrogen (15N) from velvet bean in the soil-plant system
Provedor de dados: 63
Autores: Scivittaro,Walkyria Bueno; Muraoka,Takashi; Boaretto,Antonio Enedi; Trivelin,Paulo César Ocheuze.
Because of their potential for N2 biological fixation, legumes are an alternative source of nitrogen to crops, and can even replace or supplement mineral fertilization. A greenhouse experiment was carried out to evaluate temporal patterns of velvet bean (Mucuna aterrima) green manure release of nitrogen to rice plants, and to study the fate of nitrogen from velvet bean in rice cultivation. The isotopic dilution methodology was used. Treatments consisted of a control and 10 incubation periods of soil fertilized with 15N-labeled velvet bean (0, 20, 40, 60, 90, 120, 150, 180, 210, and 240 days). The plant material was previously chopped, sifted (10 mm mesh sieve) and oven-dried (65ºC). Incubation of the plant material (2.2 g kg-1 soil) was initiated by the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mucuna aterrima; Effectiveness; Recovery; Losses.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000200014

Hipóteses estatísticas com dados desbalanceados nos modelos com três fatores de efeitos fixos hierarquizados
Provedor de dados: 63
Autores: Oikawa,Sérgio Minoru; Iemma,Antonio Francisco.
Este trabalho tem por objetivo formalizar os termos das respectivas somas de quadrados e hipóteses mais usuais, que são testadas nos modelos com três fatores de efeitos fixos hierarquizados para dados desbalanceados. Discute-se, também, o problema da interpretação de hipóteses associadas às somas de quadrados, bem como comparam-se os resultados fornecidos por alguns softwares estatísticos.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dados desbalanceados; Somas de quadrados; Hipóteses testáveis; Softwares estatísticos.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000500014

Intermittent warming of 'Tahiti' lime to prevent chilling injury during cold storage
Provedor de dados: 63
Autores: Kluge,Ricardo Alfredo; Jomori,Maria Luiza Lye; Jacomino,Angelo Pedro; Vitti,Maria Carolina Dario; Vitti,Daniela Cristina Clemente.
Storage of 'Tahiti' limes (Citrus latifolia) at low temperature allows the marketing period to be extended. However, the loss of the green skin color and the occurrence of chilling injury (CI) prevent this extension. The purpose of this work was to verify the efficiency of intermittent warming (IW) in 'Tahiti' lime quality maintenance during cold storage. Fruit were submitted to IW (20ºC for 48 hours every 7 or 14 days or 38ºC for 24 hours every 14 days) during cold storage at 5ºC. Fruit were also stored at 5 and 10ºC continuously. The evaluations were carried out after 30 and 60 days of storage (+ 3 days of simulated marketing at 20ºC). CI occurrence on fruit was not verified after 30 days of storage. However, after 60 days of storage 60% of the fruit...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Citrus latifolia; Chilling injury; Ethanol; Acetaldehyde; Degreening.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000400018

Spectral variables, growth analysis and yield of sugarcane
Provedor de dados: 63
Autores: Simões,Maurício dos Santos; Rocha,Jansle Vieira; Lamparelli,Rubens Augusto Camargo.
Spectral information is well related with agronomic variables and can be used in crop monitoring and yield forecasting. This paper describes a multitemporal research with the sugarcane variety SP80-1842, studying its spectral behavior using field spectroscopy and its relationship with agronomic parameters such as leaf area index (LAI), number of stalks per meter (NPM), yield (TSS) and total biomass (BMT). A commercial sugarcane field in Araras/SP/Brazil was monitored for two seasons. Radiometric data and agronomic characterization were gathered in 9 field campaigns. Spectral vegetation indices had similar patterns in both seasons and adjusted to agronomic parameters. Band 4 (B4), Simple Ratio (SR), Normalized Difference Vegetation Index (NDVI), and Soil...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: NDVI; Vegetation index; Biomass; Field spectroscopy; Temporal evolution.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000300001

ANÁLISE FAUNÍSTICA DE ESPÉCIES DE MOSCA-DAS-FRUTAS (DIP., TEPHRITIDAE) EM MINAS GERAIS
Provedor de dados: 63
Autores: CANAL,N.A.; ALVARENGA,C.D.; ZUCCHI,R.A.
Em seis locais de quatro municípios (Janaúba, Jaíba, Nova Porteirinha e Itacarambí) do norte do Estado de Minas Gerais, foram coletados 29.454 espécimes de mosca-das-frutas, pertencentes a Ceratitis capitata e a 20 espécies de Anastrepha. O levantamento foi feito entre janeiro de 94 e dezembro de 96, utilizando armadilhas plásticas tipo McPhail. Ceratitis capitata foi a espécie predominante em áreas urbanas. As espécies de Anastrepha predominaram em áreas rurais. A. obliqua, A. zenildae e Anastrepha n. sp.3 foram as espécies predominantes do gênero, entretanto, essa predominância variou de local para local em função da disponibilidade de hospedeiros. As comunidades apresentaram índices de diversidade baixos e quocientes de similaridade entre 73 e 100%.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Moscas-das-frutas; Tephritidae; Anastrepha; Ceratitis capitata; Ecologia.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000100004

Characterization and selection of Bacillus thuringiensis isolates effective against Sitophilus oryzae
Provedor de dados: 63
Autores: Silva,Najara da; Thuler,Ana Maria Guidelli; Abreu,Irlan Leite de; Davolos,Camila Chiaradia; Polanczyk,Ricardo Antonio; Lemos,Manoel Victor Franco.
The entomopathogenic bacterium Bacillus thuringiensis is a control agent with toxic and environmental characteristics that allows the control of pest insects according to the Integrate Pest Management (IPM) precepts. In order to find new strains, potentially toxic to Sitophilus oryzae L. 1763 (Coleoptera: Curculinidae), 1.073 strains of B. thuringiensis from parts of Brazil were used. Genetic material was extracted with InstaGene Matrix kit, used for the amplification of sequences in Polymerase chain reaction (PCR), and viewed in 1.5% agarose gel. The gene cry35Ba class was represented by 60 B. thuringiensis isolates (5.6%), which were then subjected to bioassays with S. oryzae larvae. Among the isolates studied, four caused more than 50% mortality in...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Coleoptera; Curculionidade; Crystal protein; Entomopathogenic bacterium.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000400015

Resistance induction in wheat plants by silicon and aphids
Provedor de dados: 63
Autores: Gomes,Flávia Batista; Moraes,Jair Campos de; Santos,Custódio Donizete dos; Goussain,Márcio Marcos.
The pest greenbug Schizaphis graminum (Rondani) (Hemiptera: Aphididae) stands out among the factors limiting Brazilian wheat production. Chemical control is predominant in aphid management making the production dependent on insecticides. The effect of silicon and previous infestation with aphids on the induction of resistance to the greenbug was evaluated in wheat plants. Treatments consisted of control; fertilization with calcium silicate; plant infestation with aphids; fertilization with calcium silicate + plant infestation with aphids. A free-choice preference test was performed 35 days after seedling emergence; the aphid's intrinsic rate of population increase (r m) was also determined, and the activities of three enzymes (peroxidase,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Schizaphis graminum; Triticum aestivum; Pest management; Induced resistance; Host plant resistance.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000600006

Water consumption of the estevia (Stevia rebaudiana (Bert.) Bertoni) crop estimated through microlysimeter
Provedor de dados: 63
Autores: Fronza,Diniz; Folegatti,Marcos Vinícius.
The knowledge of water requirement of crops in the different growing phases elicits higher crop yield and rational use of water resource. The aim of this work was to estimate the water consumption of stevia using two constant watertable microlysimeters. The research was conducted in San Piero a Grado, Pisa, Italy. The data were collected daily from June, 1st, to October, 22th, 2000. Reference evapotranspiration was determined by the Penman-Monteith-FAO method, in the same period. Microlysimeters watertables level were maintained at the 35 cm depth. Crop evapotranspiration for the total cicle (80 days) was 464 mm. For the most water consuming phase, crop average evapotranspiration was 5.44 mm day-1. The crop coefficient values were 1.45 for the first 25...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Lysimeter; Water requirement; Evapotranspiration.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000300028

Seed conditioning of red oak: a recalcitrant North American seed
Provedor de dados: 63
Autores: Struve,D.K.
A ten day aerated water soak was developed as a seed conditioning treatment for red oak (Quercus rubra L.). Conditioned seeds had higher germination completeness, uniformity and speed compared to control seeds. Seeds could be conditioned under a wide range of temperatures and durations. Conditioned seeds were maintained at 7(0)C for 30 days without loss of seed quality. During conditioning, pericarps split in response to seed hydration. Split pericarps could be used as a pre-sowing indicator for high quality seeds. Seed conditioning was ineffective on dormant seeds. Increased crop uniformity and higher stand establishment can be realized by subjecting red oak acorns to an aerated water soak treatment followed by selecting seeds with split pericarps. These...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Quercus rubra; Acorns; Stratification; Aerated water soak; Germination capacity; Seed storage; Seedling quality.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000500012

Water retention and penetration resistance equations for the least limiting water range
Provedor de dados: 63
Autores: Leão,Tairone Paiva.
ABSTRACT: The least limiting water range is a soil physical quality indicator, which is useful to predict the optimum water range for plant growth in a given soil and to study the effects of soil use and management over this optimum water range by integrating the effects of available water, penetration resistance and air filled porosity. This study tested six equations to fit water retention and penetration resistance surface responses used to determine the least limiting water range and present a simple algorithm written in the open source software R for fitting, calculation and visualization of the least limiting water range. Five soils from Brazil and Canada, under different use and management conditions were used to test the functions. The results show...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nonlinear regression; Soil physical quality.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162019001200172

Nutrient concentrations in potato stem, petiole and leaflet in response to potassium fertilizer
Provedor de dados: 63
Autores: Reis Jr.,Roberto dos Anjos; Monnerat,Pedro Henrique.
Chemical composition of potato stem, petiole and leaflet were evaluated in response to the application of K fertilizer. Potassium was applied at six different rates (0, 60, 120, 240, 480 and 960 kg ha-1 of K2O), as K2SO4 and was placed in the furrow during planting. Two plants per plot were sampled 48 days after plant emergence to evaluate N, P, K, Ca, Mg, S, Cu, Mn and Zn concentrations in stems, petioles and leaflets of the youngest fully expanded leaf. It is recommended using potato petioles to evaluate the N, P, K, Ca, Mg and Cu status and using potato leaflet to evaluate the S, Mn and Zn status. The stem was not a good indicator of S nutritional status. Petiole N, P and Cu concentrations associated with the maximum tuber yield (30.5 t ha-1, with 353.4...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nutrient; Nutritional monitoring; Potato.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000200009

Evaluation of morphological characteristics in Venezuelan maize (Zea mays L.) genotypes under drought stress
Provedor de dados: 63
Autores: Camacho,R.G.; Caraballo,D.F.
A greenhouse experiment was carried out to evaluate the responses among 10 maize (Zea mays L.) genotypes under drought stress. Seeds were planted in washed sand in plastic pots. The research was established in a completely random design with ten treatments and three replicate pots. The plants were harvested four weeks after sowning, and leaf area per plant (LA), root volume (RV), longest root length (LRL), plant height (PH), fresh (RFW) and dry weight (ROW) of roots, shoot dry weight (SOW), RDW/SDW ratio, and total dry matter production (TDM) were determined. Significant varietal differences for all characters were found, except for LRL. The data obtained allowed to identify Cargill-163 as a poor genotype at low water supply. Danac-3006, FM-6,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays; Leaf area; Root volume; Root length; Plant height; Root weight; Shoot weight; Total dry matter; Drought resistance.
Ano: 1994
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000300012

CONDICIONAMENTOS MECÂNICOS DE MUDAS DE TOMATEIRO (Lycopersicon esculentum Mill.)
Provedor de dados: 63
Autores: Bovi,José Eduardo; Minami,Keigo.
Avaliou-se o efeito de condicionamentos mecânicos de ventilação, agitação e esfregamento em mudas de tomateiro do cultivar Angela Gigante I 5.100 Asgrow (Lycopersicon esculentum Mill.). O experimento foi realizado em estufa plástica tipo tunel, alto com delineamento experimental inteiramente casualizado, com doze repetições. Os parâmetros avaliados foram: altura, diâmetro, número de folhas; massa de matéria seca da raiz, brotações e total, e as relações entre massa de matéria seca das brotações/ massa matéria seca da raíz, altura/diâmetro. Os resultados obtidos mostraram que o condicionamento por esfregamento proporcionou, aos 27 dias de idade, mudas de menor altura e maior diâmetro quando comparadas às mudas dos demais tratamentos e testemunhas.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Esfregamento; Agitação; Ventilação; Tomate.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000100015

Sugarcane grown in an oxisol amended with sewage sludge and vinasse: nitrogen contents in soil and plant
Provedor de dados: 63
Autores: Franco,Ademir; Marques,Marcos Omir; Melo,Wanderley José de.
Sewage sludge is a residue from waste water treatment plants and vinasse is a main effluent from alcohol distilleries. The main differences between them are observed in the nitrogen (N) and potassium (K) contents. Sewage sludge is poor in K, and the vinasse in N. This research was carried out to evaluate sewage sludge and vinasse effects on the nitrogen contents of the plant-soil system and the effects of their application on planted-cane and 1st. ratoon-cane under field conditions, on a Typic Haplustox, in Pontal, State of São Paulo, Brazil, using the sugarcane cultivar SP81-3250. A randomized blocks experimental design was used with 13 treatments and three replications. The results were organized in a 3 × 2 × 2 factorial scheme (three residue forms, two...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Agricultural reuse; Residue; Productivity; Vinasse; Sludge.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000400013

Spatial and temporal variability of leaf wetness duration in the State of São Paulo, Brazil
Provedor de dados: 63
Autores: Hamada,Emília; Ghini,Raquel; Fernandes,Jeferson Lobato; Pedro Júnior,Mário José; Rossi,Paulo.
One of the main factors influencing the occurrence of plant diseases is the leaf wetness duration (LWD). However, this climatic parameter is not generally and systematically recorded at meteorological stations, and the alternative to obtain an estimate for LWD is the use of mathematical models. The objective of this study was to estimate LWD for the State of São Paulo, on the basis of the number of hours with relative humidity equal to or higher than 90%, and also plot them on a map with help of the Geographical Information System (GIS) tool. Using daily relative humidity data from ten meteorological stations of the State, for six years, adjustment equations were obtained for different LWD periods (hours day-1) (R² from 0.58 to 0.81) and of number of days...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Plant diseases; Relative humidity; Geographical Information System; Regression equation.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000700006

WATER NEEDS FOR WINTER BEAN CROP
Provedor de dados: 63
Autores: Klar,A.E.; Fernandes,M.A.
A study of water use by bean winter crop (Phaseolus vulgaris, L., cv. Carioca) was carried out in a Red Yellow Latosol, clay texture. A furrow irrigation system maintained soil water potentials higher than -40 KPa. Two broadcast nitrogen treatments (0 and 30 kg N/ha) were applied 25 days after planting. The major objectives were to study the nitrogen and evapotranspiration interaction and measure the crop coefficients (Kc). The maximum average evapotranspiration (ETm) was 1.71 mm/day, or 157.16 mm over 92 days of observations; the ETm values for the vegetative (1), flowering (2) and pod formation (3) phases were 1.48, 2.35, and 1.50 mm/day, respectively, for the 30 kg/ha nitrogen treatment, and 1.48, 1.88 and 1.45 mm/day for the no nitrogen treatment. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Evapotranspiration; Crop coefficient; Irrigation.
Ano: 1997
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161997000200004

Quality of wild boar meat and commercial pork
Provedor de dados: 63
Autores: Marchiori,Andréa Fernanda; Felício,Pedro Eduardo de.
Presently there is a growing interest in the production and marketing of wild boar meat, and to attend a differentiated consumer demand the quality attributes of this product should be well established. To characterize the quality of wild boar meat in comparison to commercial pork, post mortem changes in the longissimus dorsi and semimembranosus muscles were determined by pH and temperature decline, and color (CIE L*a*b*) measurements. Water holding capacity (WHC) was determined by the compression method and the exudate loss (EL) by the drip loss test. Decline in longissimus dorsi muscle pH of wild boar was gradual and in the pork it was faster and more extensive. Temperature differences were observed in some post mortem times, and the lowest values were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: PH; Color; Drip loss; Water holding capacity.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000100001

Óxidos de ferro e de alumínio e a mineralogia da fração argila deferrificada de latossolos ácricos
Provedor de dados: 63
Autores: Alleoni,L.R.F.; Camargo,O.A.
Foram obtidos os teores totais e também os livres e amorfos de óxidos de ferro e alumínio de dois latossolos roxos (LR) e de um latossolo variação Una (LU) ácricos do norte do Estado de São Paulo, que se caracterizam por avançado estado de intemperismo, exibindo CTC efetiva menor que 15 mmolc/kg de argila. Para os três solos, a mineralogia da fração argila foi dominada por caulinita e gibbsita, aparecendo também vermiculita com hidroxila entrecamadas em pequena quantidade. Nos latossolos roxos ácricos, os teores de ferro e alumínio totais, livres e amorfos foram maiores do que no LU. Nesses solos, a gibbsita respondeu por mais da metade da fração argila deferriflcada, enquanto que no LU a participação da caulinita foi mais significativa (54 x 46%). No...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mineralogia de argila; Óxidos de ferro e alumínio; Latossolos ácricos.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000300002

Controlled traffic and soil physical quality of an Oxisol under sugarcane cultivation
Provedor de dados: 63
Autores: Souza,Gustavo Soares de; Souza,Zigomar Menezes de; Cooper,Miguel; Tormena,Cássio Antônio.
Machinery traffic in sugarcane (Saccharumsp.) plantations reduces soil physical quality, and hinders both root development and crop yield. We evaluated the physical quality of an Oxisol and the development of sugarcane roots under controlled traffic. The treatments assessed were: without controlled machinery traffic (WCT), controlled traffic by adjusting the tractor and infield wagons to a 3.0 m track width with the operator guiding the machinery (CT1) and the previous treatment using real time kinematic / global positioning system (RTK / GPS) precision auto steer (CT2). Soil samples were collected from the planting rows, seedbed and inter-row center to determine the least limiting water range (LLWR) and soil porosity from scanned 2-D images. The root dry...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Least limiting water range; Soil compaction; Machinery traffic; Root system.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162015000300270

Temperatura e pré-condicionamento de sementes de soja para o teste de tetrazólio
Provedor de dados: 63
Autores: Costa,N.P. da; Marcos Filho,J.
Com o objetivo de encontrar uma alternativa metodológica para a redução do período de condicionamento (tempo de embebição) que antecede o processo de coloração de sementes para a realização do teste de tetrazólio, foram estudados quatro períodos de embebição (4h, 6h, 8h e 10h) e duas temperaturas (35° C e 42 °C) tendo como testemunha o procedimento padrão de 16 horas de embebição a 25°C. Utilizaram-se lotes de sementes de soja dos cultivares OCEPAR 4-Iguaçu e BR-4. A análise dos dados e a interpretação dos resultados mostraram que a temperatura empregada para o pré-condicionamento das amostras é fundamental no mecanismo de coloração das sementes através do teste de tetrazólio. Assim, a embebição de sementes de soja à temperatura de 42°C durante oito a dez...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycine max (L.) Merrill; Tetrazólio; Temperatura; Sementes; Níveis de qualidade; Dano mecânico.
Ano: 1994
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000100023

Rastreability of bovine meat and bone meal using the stable isotope technique in egg production
Provedor de dados: 63
Autores: Denadai,Juliana Célia; Batistioli,Julianna Santos; Sartori,José Roberto; Madeira,Luciene Aparecida; Sartori,Maria Márcia Pereira; Pizzolante,Carla Cachoni; Kakimoto,Sérgio Kenji; Contin Neto,Armando Carlos; Costa,Vladimir Eliodoro.
ABSTRACT The present study aimed to verify whether the inclusion of other ingredients in the diet of laying hens could interfere with the traceability of bovine meat and bone meal (BMBM) in eggs through stable carbon and nitrogen isotope analysis. Two hundred and fifty-six white laying hens were used and randomly distributed into eight treatments composed of: CONTROL: control diet; GLUTEN: control diet + corn gluten; YEAST: control diet + yeast; GLUTEN + YEAST: control diet + corn gluten + yeast; BMBM: control diet + 4.5 % BMBM; BMBM + GLUTEN: control diet + corn gluten + 4.5 % BMBM; BMBM + YEAST: control diet + yeast + 4.5 % BMBM; BMBM + GLUTEN + YEAST: control diet + corn gluten + yeast + 4.5 % BMBM. The isotopic results were subjected to multivariate...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Albumen; Carbon-13; Nitrogen-15; Traceability; Yolk.
Ano: 2022
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162022000100402

Qualitative characteristics of meat from confined crossbred heifers fed with lipid sources
Provedor de dados: 63
Autores: Fiorentini,Giovani; Berchielli,Telma Teresinha; Santana,Márcia Cristina Araújo; Dian,Paulo Henrique Moura; Reis,Ricardo Andrade; Sampaio,Alexandre Amstalden Moraes; Biehl,Marcos Vinicius.
Lipids have been used in ruminant feed to replace high amounts of grain for increasing the diet energy density, performance and meat quality. This study evaluated the qualitative characteristics of meat from feedlot heifers fed with sources of lipid supplements. Twenty-one crossbred heifers (1/4Nelore × 1/4Santa Gertrudis × 1/2Braunvieh) were used. Each heifer received 60 % forage with a base of corn silage and 40 % concentrate, resulting in 5.8 % lipid content in the total diet. The following sources of lipids were used: soybeans, protected fat and soybean oil. There were no differences on physical characteristics of meat samples from heifers fed with the lipid sources. Soybeans increased the concentration of linoleic acid, content of polyunsaturated...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Meat quality; Protected fats; Soybeans; Soybean oil.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162012000500008

Infestation by Enneothrips flavens Moulton and yield of peanut cultivars
Provedor de dados: 63
Autores: Moraes,Andrea Rocha Almeida de; Lourenção,André Luiz; Godoy,Ignácio José de; Teixeira,Gustavo de Carvalho.
Because of damages caused, general occurrence in crops, and high population levels, the most important peanut pest in Brazil is the thrips Enneothrips flavens Moulton (Thysanoptera: Thripidae). A field experiment was carried out during the 2001/2002 growing season, in Campinas and Pindorama, State of São Paulo, Brazil, to evaluate the influence of E. flavens on yield of six peanut cultivars. Treatments comprised three cultivars of the upright type and three of the runner type, with and without chemical control of the insect. Thrips infestation was evaluated by insect countings on young leaflets. Yield and yield reduction percentage due to the lack of thrips control were estimated. The lack of insect control resulted in yield reductions varying from 19.5 to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Arachis hypogaea L.; Thysanoptera; Thripidae; Insecta; Host plant resistance.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000500010

Honey bee as an effective pollinating agent of pumpkin
Provedor de dados: 63
Autores: Nicodemo,Daniel; Couto,Regina Helena Nogueira; Malheiros,Euclides Braga; De Jong,David.
The production of fruits and seeds of many crops is increased when bees visit their flowers pollinating them. The aim of this research was to study the pollination of pumpkins (Cucurbita maxima Duch. var. Exposição), to determine the diversity of insects visiting its flowers, the time and type of provision obtained and the effect of the visits on fruit set, fruit size and weight, and number of seeds. Apis mellifera L. accounted for 73.4% of the visits made by bees, collecting pollen during 34.5 s per flower and nectar in 43.9 s and 29.3 s from female and male flowers, respectively. Trigona spinipes (Fabr.) collected only nectar, during a mean time of 60.5 s per flower, and represented 26.6% of the visits by bees. Diabrotica speciosa (Germ.) only fed on the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cucurbita maxima; Pollination; Honey bee.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000400007

Boron affects the growth and ultrastructure of castor bean plants
Provedor de dados: 63
Autores: Silva,Denis Herisson da; Rossi,Monica Lanzoni; Boaretto,Antonio Enedi; Nogueira,Neusa de Lima; Muraoka,Takashi.
The cultivation of oleaginous plants like the castor bean guarantees employment for agricultural families and can contribute in energy and chemical sectors, especially in the northeastern semi-arid regions of Brazil. Boron (B) deficiency is a widespread nutritional disorder despite the fact that various anthropogenic sources with high B content may increase soil B to toxic levels for plants. The present study was designed to investigate the ultrastructural effects of boron deficiency and toxicity on castor bean plants which were grown under greenhouse condition using plastic containers with 10 L of nutrient solution. Boron treatments comprised: control (no B); 0.27 mg L-1, 5.40 mg L-1 B pots (one plant per pot), tested in a completely randomized design...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Electron microscopy; Middle lamellae; Micronutrient; Xylem; Starch.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000600014

Alternative method for volumetric core removal in hardsetting soils
Provedor de dados: 63
Autores: Lima,Herdjania Veras de; Silva,Álvaro Pires da; Imhoff,Sílvia; Neves Junior,Afrânio Ferreira.
Due to the narrow window of ideal moisture conditions required for collecting undisturbed soil samples from hardsetting horizons in the field, this study compared the efficiency of an alternative method of soil core removal in the laboratory with that of the traditional field method by using measurements of soil bulk density data (Db). In a first sampling, cylinders were removed with a soil sampler in the field. In a second sampling, large soil blocks were removed with Kubiena-type zinc (brass) boxes in the field. Volumetric core cylinder samples were removed from these blocks in the laboratory with a manual hydraulic pump. There were no differences between the Db values determined from the laboratory and the field coring method. The laboratory method was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil sampler; Undisturbed samples; Soil bulk density.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000500015

Developing a continuous adjustment factor for dry matter intake of gestating and lactating ewes
Provedor de dados: 63
Autores: Gallo,Sarita Bonagurio; Tedeschi,Luis Orlindo.
ABSTRACT: Intake is a multifactorial process that is influenced by animal type, environmental factors, and diet characteristics. Sheep, especially, have specific eating habits, with a greater selection of ingested feed compared to cattle. Thus, predictive equations for dry matter intake (DMI) must constantly be reviewed. The objective of this study was to combine different adjustment factors to develop one continuous adjustment factor for predicting the DMI of pregnant, dry, and lactating ewes. The equations evaluated for non-lactation ewes accounts for metabolic body weight and weight gain, and the equation for lactating ewes includes milk production and its fat content. The database used in this study was pooled from hair sheep ewes, two to four years...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mathematical model; Nutrition model; Prediction; Requirement; Sheep.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000200502

Multiobjective optimization of economic balances of sugarcane harvest biomass
Provedor de dados: 63
Autores: Florentino,Helenice de Oliveira; Moreno,Edmundo Vergara; Sartori,Maria Márcia Pereira.
The fact that Brazil is the world's largest sugarcane (Saccharum spp.) producer, leads to a great concern about the cropping systems used, since the most common practice involves manual harvesting prior to straw burning. Brazilian authorities approved a law prohibiting the burning practice of crop residues prior to harvest. However mechanized harvest creates the new problem of how to deal with the residues. Many studies have proposed the use of these residues as an energy source. The major difficulty in its use is how to economically transport sugarcane harvested biomass from the farm to a processing center. The aim of this work was to develop a model to optimize plant variety selection, minimize the cost of the residual biomass transfer process, to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mathematical model; Residual biomass; Sugarcane; 0-1 multiple objective linear programming.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000500018

In vitro sensivity of fig plantlets to gamma rays
Provedor de dados: 63
Autores: Ferreira,Ester Alice; Pasqual,Moacir; Tulmann Neto,Augusto.
Fig breeding programs through conventional methods are rare in many countries, e.g. Brazil, since the wasp Blastophaga psenes, which is responsible for the natural pollination, is not present. For these cases a low cost alternative for the breeding program is the induction of physical mutagenesis by radiation. The sensivity of fig explant buds of different sizes to gamma radiation were evaluated. Fig plantlets "Roxo de Valinhos" already established in vitro were classified by size in 2.5 to 4.5 cm, 5 to 9 7 cm and 8 to 10 cm long, and irradiated with: 10, 20, 30, 40 and 50 Gy doses. After irradiation each plantlet was cut in pieces containing one-bud and transferred to WPM culture medium, according to the bud position: medium and apical. Explants were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mutation; Breeding; Tissue culture.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000400017

Growth regulators and darkness increase efficiency in in vitro culture of immature embryos from peppers
Provedor de dados: 63
Autores: Manzur,Juan Pablo; Calvache-Asensio,María de las Nieves; Rodriguez-Burruezo,Adrian.
Common pepper (Capsicum annuum L.) is one of the most important vegetables in the world, and extensive breeding efforts are being made to develop new improved strains of this species. In this regard, in vitro culture of immature embryos may help breeders accelerate breeding cycles and overcome interspecific barriers, among other applications. In this study, we have optimized a protocol for in vitro culture of immature embryos of C. annuum. Levels of indole-3-acetic acid (IAA) and zeatin have been tested to improve the efficiency (germination rates) of this technique in C. annuum embryos at the four main immature stages (i.e. globular, heart, torpedo, and early cotyledonary) from four varietal types of this species (California Wonder, Piquillo, Guindilla,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Capsicum peppers; Embryo stage; Genotypic diversity; Indole-3-acetic acid; Zeatin.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162014000600007

Longevidade e reprodução de Cryptolestes pusillus (Schoenherr) (Col., Cucujidae) após irradiação gama
Provedor de dados: 63
Autores: Wiendl,F.M.; Arthur,V.; Wiendl,J.A.; Pelutzen,F.G.
Insetos adultos da espécie Cryptolesles pusillus (Schoenherr) foram irradiados com idade entre 2 e 7 dias, com as seguintes doses de radiações gama do Cobalto-60: 0 (test.); 12,5; 25,0; 50,0; 100,0; 200,0; 500,0; 1000,0; 2500,0 e 5000,0 Gy, sob uma taxa de dose de 13,2 Gy por minuto. Após a irradiação os insetos foram mantidos em dois grupos, um à temperatura de 25°C e o outro a 30°C, sob umidade relativa entre 60 e 80%. Observou-se a cada dois dias a mortalidade destes insetos, concluindo-se que as vidas médias foram respectivamente as seguintes na temperatura de 25°C : 65,1; 67,7; 78,8; 81,5; 20,7; 12,3; 12,5; 9,2; 5,8 e 2,6 dias. Na temperatura de 30°C as vidas médias foram: 67,5; 119,5; 160,3; 66,2; 10,2; 9,2; 9,4; 6,6; 6,3 e 2,2 dias. Igualmente a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Longevidade; Reprodução; Radiações gama; Radiohormesis; Desinfestação; Cryptolestes pusillus.
Ano: 1994
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000200004

PRODUTOS DE EMULSÃO (FIAMBRES) ELABORADOS COM CARNE DE POEDEIRAS LEVES (LEGHORN) DE DESCARTE E ÓLEOS VEGETAIS
Provedor de dados: 63
Autores: Nardin,Tânia Regina Fiore; Graner,Murilo; Verruma-Bernardi,Marta Regina.
Foram elaborados fiambres (emulsões) curados e defumados com carne de poedeiras leves e óleos vegetais, e foi feita a sua comparação com produto semelhante, obtido com carne de frangos de corte. Na desossa manual dos cortes, obteve-se um rendimento médio de 14,73% para peito, 14,91% para pernas e coxas e 2,46% para as coxinhas das asas, em relação ao peso da carcaça (média de 1195,81g). A carne mista foi obtida a partir de 14,73% de carne branca (peito) e 17,37% de carne escura (pernas e coxas e coxinhas das asas). O rendimento final na obtenção do produto foi de 113,50%, em relação à carne mista; em relação à carcaça congelada, de 34,34%. Quanto à composição química, os produtos apresentaram, em média, 64,76% de umidade, 13,91% de proteína, 16,62% de...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Carne de poedeira; Óleo vegetal; Fiambre; Emulsão de carne.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000200015

PREPARAÇÕES DE Saccharomyces cerevisiae ELICITORAS DE FITOALEXINAS EM MESOCÓTILOS DE SORGO
Provedor de dados: 63
Autores: WULFF,N.A.; PASCHOLATI,S.F.
A levedura Saccharomyces cerevisiae estimula o acúmulo de fitoalexinas e tem potencial para ser utilizada como agente de controle alternativo no tratamento de doenças fúngicas em sorgo. São descritos aqui os procedimentos iniciais para a purificação de elicitores de fitoalexinas em sorgo, os quais são extraídos das células da levedura S. cerevisiae por autoclavagem, indicando serem termoestáveis. Após precipitacão com etanol, em concentrações finais de 50 e 80%, as moléculas elicitoras permanecem em solução. O acúmulo de fitoalexinas nos mesocótilos é mais elevado quanto maiores os teores de proteínas das amostras elicitoras.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Elicitor; Levedura; Resposta de defesa.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000100022

Influência das culturas láticas no índice de proteólise do queijo minas frescal
Provedor de dados: 63
Autores: Isepon,J.S.; Oliveira,A.J.
Estudou-se, a influência de culturas láticas no índice de proteólise do queijo Minas Frescal, processado com leite não pasteurizado e pasteurizado. O emprego de culturas láticas na elaboração de queijo Minas Frescal pode ser indicado, uma vez que o índice de proteólise só se correlacionou com o tempo de conservação.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Queijo Minas Frescal; Culturas láticas; Índice de proteólise.
Ano: 1993
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161993000300018

In-vitro screening of Kalahari browse species for rumen methane mitigation
Provedor de dados: 63
Autores: Theart,Jacobus Johannes Francois; Hassen,Abubeker; van Niekerk,Willem Adriaan; Gemeda,Belete Shenkute.
The nutritional value of browse foliage from the Thorny Kalahari Dune Bush veld of South Africa is not characterized. Most of this browse species is rich in tannin, but still palatable, and is consumed by ruminants during the dry season, as well as having a role to play in mitigating enteric methane emission from ruminants. In this study, the rumen methane mitigation potential of 19 browse species foliage collected from the Thorny Kalahari Dune Bush veld, was analyzed in terms of chemical composition, in vitro fermentation, digestibility and methane production. In vitro gas and methane production and organic matter digestibility (IVOMD) were determined by using rumen fluid collected, strained and anaerobically prepared. A semi-automated system was used to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: In vitro fermentation; Browse foliage; Digestibility; Tannin.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162015000600478

Phytoremediation of lead by jack beans on a Rhodic Hapludox amended with EDTA
Provedor de dados: 63
Autores: Pereira,Bruno Fernando Faria; Abreu,Cleide Aparecida de; Herpin,Uwe; Abreu,Mônica Ferreira de; Berton,Ronaldo Severiano.
A greenhouse study was conducted to evaluate the effects of ethylenediamine tetraacetic acid (EDTA) addition to soils on the lead (Pb) phytoextraction potential of jack beans (Canavalia ensiformis L.). In a pot experimentSoil samples (dystrophic Rhodic Hapludox) were treated with six Pb rates (0, 100, 200, 350, 1,200, and 2,400 mg kg-1 soil) applied as Pb(NO3)2 without and with EDTA application (0 and 0.5 g kg-1, respectively). Lead, Cl-, NO3-, NH4+, SO4(2-), H2PO4-, Zn2+, Cu2+, Fe3+, Al3+, Ca2+, Mg2+, K+ and DOC (dissolved organic carbon) concentrations obtained in a saturation soil extract (soil:water ratio of 1:0.3) were used for Pb speciation by means of the software Visual-Minteq 2.30. Soil Pb-availability was assessed with Diethylene triamine...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ionic speciation; Phytoextraction; Soil pollution; Soil solution; Chelate.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000300009

EFEITOS DE GIBERELINAS, CITOCININAS E DO NITRATO DE POTÁSSIO NO CRESCIMENTO E DESENVOLVIMENTO DO PORTA-ENXERTO DE LIMOEIRO `CRAVO'
Provedor de dados: 63
Autores: LEONEL,S.; RODRIGUES,J.D.
Os efeitos de reguladores vegetais do grupo das giberelinas e citocininas, bem como do nitrato de potássio, foram estudados no crescimento e desenvolvimento do porta-enxerto de limoeiro `Cravo' (Citrus limonia Osbeck). As sementes foram extraídas de frutos maduros, lavadas, secas à sombra e armazenadas em câmara fria (4 - 5oC) durante sessenta dias, até o mês de maio/1993, quando foram semeadas nos canteiros de semeadura. As pulverizações com os fitorreguladores foram realizadas no viveiro e tiveram início com as plantas aos 8 meses de idade, contados a partir da semeadura, sendo efetuadas um total de 4 pulverizações, realizadas a intervalos quinzenais. Os tratamentos corresponderam a: 25, 50 e 75 ppm de GA3; 25, 50 e 75 ppm de...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Reguladores vegetais; Plantas jovens; Citrus limonia.
Ano: 1996
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161996000200012

Low doses of monensin for lambs fed diets containing high level of ground flint corn
Provedor de dados: 63
Autores: Polizel,Daniel Montanher; Martins,André Storti; Miszura,Alexandre Arantes; Ferraz Júnior,Marcos Vinícius de Castro; Bertoloni,Analisa Vasques; Oliveira,Gabriela Bagio; Barroso,José Paulo Roman; Ferreira,Evandro Maia; Pires,Alexandre Vaz.
ABSTRACT Two experiments were proposed to evaluate the addition of monensin for lambs fed diets containing a high level of mature ground flint corn. The experimental diets were as follows: no inclusion of monensin (M0) and inclusion of 8 (M8), 16 (M16) and 24 mg kg–1 of monensin (M24). In experiment 1, eight cannulated wethers were divided into a double 4 × 4 Latin square experimental design to evaluate nutrient digestibility, plasma parameters and rumen fermentation. The experiment lasted 112 days, divided into four periods of 28 days each. In experiment 2, ninety-two lambs were used in a randomized block design to evaluate the performance over 56 days. In experiment 1, doses of monensin had no effect on nutrient intake (p ≥ 0.07) and digestibility (p ≥...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Feed efficiency; Propionate; Sheep.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000400402

AVALIAÇÃO DE GENÓTIPOS DE CENTEIO, TRITICALE, TRIGO COMUM E  TRIGO DURO QUANTO À TOLERÂNCIA AO ALUMÍNIO EM SOLUÇÃO NUTRITIVA
Provedor de dados: 63
Autores: CAMARGO,C.E. de O.; FERREIRA FILHO,A.W.P.; FREITAS,J.G. de.
Estudou-se o comportamento diferencial entre 9 genótipos de centeio, 2 de triticale, 5 de trigo comum (Triticum aestivum L.) e um de trigo duro (Triticum durum L.), empregando-se soluções nutritivas arejadas, com concentrações de alumínio (0, 3, 6, 10, 15 e 20 mgL-1), à temperatura constante de 25 ± 1oC e pH 4,0. A tolerância foi medida pela capacidade das raízes primárias continuarem a crescer em solução sem alumínio, após 48 horas em solução contendo uma concentração conhecida de alumínio. Todos os cultivares de centeio Branco, Bagé, FA (In Chansti), Soron, Padrela, Montalegre, Vila Pouco de Aguiar, Gimonde e Lamego e os cultivares de trigo BH-1146 e IAC-227 foram considerados muito tolerantes, por exibirem crescimento radicular após o tratamento em...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Centeio; Triticale; Trigo comum; Trigo duro; Alumínio; Toxicidade.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000200010

Soil management of sugarcane fields affecting CO2 fluxes
Provedor de dados: 63
Autores: Tavares,Rose Luiza Moraes; Siqueira,Diego Silva; Panosso,Alan Rodrigo; Castioni,Guilherme Adalberto Ferreira; Souza,Zigomar Menezes de; Scala Jr.,Newton La.
ABSTRACT The harvesting system of green sugarcane, characterized by mechanized harvesting and no crop burning, affects soil quality by increasing the remaining straw left on the soil surface after harvesting, thus, contributing to the improvement of physical, chemical, and microbiological soil attributes, influencing CO2 fluxes. This study aimed to evaluate CO2 fluxes and their relation to soil properties in sugarcane crops under different harvesting managements: burned (B), Green harvesting for 5 years (G-5) and Green harvesting for ten years (G-10). For this, a 1 ha sampling grid with 30 points was installed in each area, all located in the Northeast of São Paulo State, Brazil. In each point, CO2 fluxes were measured and the soil was sampled to analyze...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sacharum officinarum; Principal component analysis; Porosity; Biomass.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000600543

Treatment of swine manure: case studies in European’s N-surplus areas
Provedor de dados: 63
Autores: García-González,Maria Cruz; Riaño,Berta; Teresa,Marta; Herrero,Eva; Ward,Alastair James; Provolo,Giorgio; Moscatelli,Giuseppe; Piccinini,Sergio; Bonmatí,August; Bernal,María Pilar; Wiśniewska,Hanna; Proniewicz,Marcin.
ABSTRACT In this study, eight different manure treatment plants were monitored. The plants were four on-farm and four centralized treatment plants, all of them at full-scale level. Assessment includes a total of seven pre-treatment and process units as follows: mechanical separation, with and without coagulant and flocculant addition, pasteurization, nitrification-denitrification, anaerobic digestion, and composting. The plants are located in nutrient surplus areas of three European Member States (Spain, Italy and Denmark), the majority of these areas being Nitrate Vulnerable Zones (NVZ). Results presented herein are data collected over a six-month period and comprise performance data of the treatment plants, pathogen indicators (E.coli and Salmonella) and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Greenhouse gas reduction; Manure treatment technologies; Anaerobic digestion; Composting; Nitrification-denitrification.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000500444

Integrated technology roadmapping in startups: a case study of an AgTech in the Cachaça industry
Provedor de dados: 63
Autores: Silvello,Giovanni Casagrande; Alves,Alex da Silva; Alcarde,André Ricardo.
ABSTRACT: Companies develop strategies to describe where they want to go and how they will reach their destination. Business strategies are useful but may not be sufficiently detailed for areas of high importance, such as technology and innovation. In this paper we examined the effort of building a technology roadmap with an early growth stage company located in the state of São Paulo, Brazil. Roadmaps are easy to design yet flexible tools that can allow decision makers to explore a myriad of possible strategies. However, the challenges ahead for new companies facing uncertain growth scenarios demand that framework conditions be adequately addressed, and that innovation culture and technology management tools are integrated with the technology roadmapping...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Industry 4.0; Technology roadmap; Cachaça; Electronic-nose.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000501803

Defoliation intensity and leaf area index recovery in defoliated swards: implications for forage accumulation
Provedor de dados: 63
Autores: Martins,Clóvis David Medeiros; Schmitt,Daniel; Duchini,Paulo Gonçalves; Miqueloto,Tiago; Sbrissia,André Fischer.
ABSTRACT: This study evaluated the leaf area index (LAI) recovery mechanisms and forage accumulation rates on the regrowth of different grass species subjected to different defoliation intensities. For that purpose, plots of Pennisetum clandestinum (kikuyugrass), Lolium multiflorum (annual ryegrass), and Avena strigosa (black oats) were defoliated from 20 to 80 % of their initial heights (25, 20, and 25 cm, respectively). At different increments in height, forage samples were collected to ground level and used to estimate tiller population density (TPD), leaf area per tiller (LA), and forage mass. From these data, we calculated the leaf area index (LAI), average leaf area index (aLAI), and average and instantaneous forage accumulation rate (FAR and IFAR,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Grazing heights; Grazing management; Intermittent stocking; Sward targets.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000200504

Cultivo hidropônico da roseira com recírculo prolongado e com emprego de baixa tecnologia
Provedor de dados: 63
Autores: Rodrigues,Ernesto José Resende; Minami,Keigo; Farina,Enrico.
O experimento sobre cultivo sem solo a ciclo fechado da roseira foi conduzidos no "Istituto Sperimentale per la Floricoltura di Sanremo". O objetivo foi encontrar um sistema simples com baixo emprego de capital, compatível com propriedades de pequeno e médio porte. O sistema se baseia no emprego de duas caixas, em terrenos de declive natural, uma caixa posicionada na parte mais baixa do terreno, de onde a solução nutritiva é bombeada e distribuída nas fertirrigações subsequentes. Nesta caixa, são também recolhidos os drenados que posteriormente irão recircular. Quando o volume se torna excessivamente reduzido, por efeito do consumo, coloca-se solução nutritiva nova, que se mistura ao drenado remanescente. A solução permanece sendo reciclada até ser...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Rosa; Cultivo hidropônico; Sistema fechado.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000500009

Métodos para avaliação da qualidade fisiológica de sementes de feijão vigna
Provedor de dados: 63
Autores: Bias,Antonieta Laurinda Francisco; Tillmann,Maria Ângela André; Villela,Francisco Amaral; Zimmer,Gilberto Jaime.
Visando comparar diferentes testes de vigor quanto à avaliação da qualidade fisiológica, quatro lotes de sementes de feijão vigna (Vigna unguiculata W.) de duas cultivares ('EPACE-10' e 'IPA-206') foram armazenados por 180 dias (novembro/94 a maio/95), em condições normais de ambiente em Pelotas, RS. Bimestralmente, foram conduzidos testes de germinação, envelhecimento acelerado, condutividade elétrica, frio sem solo, emergência de plântulas em campo e peso de matéria seca da parte aérea das plântulas. A análise e a interpretação dos resultados indicaram que a avaliação da qualidade fisiológica de sementes de feijão vigna deve ser fundamentada no conjunto das informações fornecidas por diferentes testes de vigor. O teste de frio sem solo, dentre os testes...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vigna unguiculata; Feijão vigna; Germinação; Vigor; Armazenamento.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000300020

Incidência de ferrugem em folhas de pessegueiro e nectarineira do germoplasma IAC
Provedor de dados: 63
Autores: Barbosa,W.; Campo-Dall'Orto,F.A.; Ojima,M.; Kalil,G.P.C.; Lovate,A.A.; Ribeiro,I.J.A.; Martins,F.P.; Nogueira,E.M.C.
Avaliou-se, em fins do verão de 1993, o grau de incidência da ferrugem (Tranzschelia discolor f. sp. domesticae), em dezoito seleções IAC de pessegueiro e seis de nectarineira, mantidos em lote de germoplasma na Estação Experimental de Jundiaí (23°08'S; 46°55'W). A porcentagem de incidência do patógeno foi estimada através de observações macroscópicas das folhas, atribuindo-se notas de 1 a 5 (1 = nula, 2 = leve, 3 = moderada, 4 = severa, 5 = muito severa), conforme o grau da severidade do sintoma. Todo o material pesquisado mostrou-se suceptível ao patógeno, entretanto, as seleções apresentaram sensíveis variações em graus de susceptibilidade. As seleções com maior tolerância ao patógeno foram: 1) pêssegos 'Régis' e IAC 4685-45 e 2) nectarinas 'Josefina' e...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pêssego; Nectarina; Ferrugem; Tranzschelia discolor f. sp. domesticae; Resistência; Seleções IAC.
Ano: 1994
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000100014

Características químicas de um latossolo adubado com uréia e cloreto de potássio em ambiente protegido
Provedor de dados: 63
Autores: Silva,Maria Anita Gonçalves da; Boaretto,Antonio Enedi; Fernandes,Henriqueta Gimenes; Boaretto,Rodrigo; Melo,Arlete Marchi Tavares de; Scivittaro,Walkyria Bueno.
A produção de vegetais mais sadios e de boa qualidade e o fornecimento contínuo no mercado são fatores que têm determinado a adoção do sistema de cultivo protegido por um número maior de produtores. Porém, devido ao pouco conhecimento sobre o manejo do solo nessas condições, tem-se aplicado altas doses de fertilizantes, ocasionando problemas de salinidade e desequilíbrio nutricional. O objetivo desse trabalho foi avaliar os efeitos da aplicação da uréia e do cloreto de potássio nas características químicas de um LATOSSOLO VERMELHO Destrófico, principalmente nos índices de acidez e saturação em potássio. O N e o K foram aplicados em cobertura, nas doses equivalentes de 13,3 e 39,9 g m-2 de N e 5,5 e 16,6 g m-2 de K, em esquema fatorial (2x2+1), com...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Capsicum annuum; Adubação nitrogenada; Adubação potássica; Saturação de potássio.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000300019

Distribution of soluble amino acids in maize endosperm mutants
Provedor de dados: 63
Autores: Toro,Alejandro Alberto; Medici,Leonardo Oliveira; Sodek,Ladaslav; Lea,Peter John; Azevedo,Ricardo Antunes.
For human nutrition the main source of vegetable proteins are cereal and legume seeds. The content of total soluble amino acids in mature endosperm of wild-type, opaque and floury maize (Zea mays L.) mutants were determined by HPLC. The total absolute concentration of soluble amino acids among the mutants varied depending on the mutant. The o11 and o13 mutants exhibited the highest average content, whereas o10, fl3 and fl1 exhibited the lowest average content. In general, the mutants exhibited similar concentrations of total soluble amino acids when compared to the wild-type lines, with the clear exception of mutants o11 and fl1, with the o11 mutant exhibiting a higher concentration of total soluble amino acids when compared to its wild-type counterpart...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays; Lysine; Threonine; Methionine.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000100014

Conservação de maracujá-doce pelo uso de cera e choque a frio
Provedor de dados: 63
Autores: Silva,Alessandra Pereira da; Vieites,Rogério Lopes; Cereda,Ede.
Estudou-se o efeito do choque a frio e da cera, na conservação pós-colheita do maracujá-doce (Passiflora alata Dryander), verificando as principais alterações físicas e químicas durante o armazenamento. Os frutos, colhidos no estádio pré-climatérico, foram desinfetados com hipoclorito de sódio e em seguida, submetidos aos tratamentos: testemunha; cera Sta fresh (1:2); choque frio (-2°C por 2 horas) + cera Sta fresh (1:2); choque frio (-2°C por 2 horas). Os frutos foram avaliados a cada 6 dias quanto a perda de peso, textura, rendimento de suco, sólidos solúveis totais e acidez total titulável. Após 30 dias a 9°C e 85-90% UR, pode-se concluir que o tratamento mais adequado à conservação do maracujá-doce foi o que utilizou a cera Sta Fresh. Os tratamentos...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Passiflora alata; Conservação; Pós-colheita; Choque frio; Cera.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000400005

Colletotrichum nymphaeae var. entomophilum var. nov. a natural enemy of the citrus scale insect, Praelongorthezia praelonga (Hemiptera: Ortheziidae)
Provedor de dados: 63
Autores: Wynns,Anja Amtoft; Jensen,Annette Bruun; Eilenberg,Jørgen; Delalibera Júnior,Italo.
ABSTRACT: The citrus scale insect Praelongorthezia praelonga (Douglas), a major pest of citrus and other economically important crops, has only two commonly documented natural enemies: an entomopathogenic strain of the fungus Colletotrichum nymphaeae (Pass.) Aa and several parasitoids. The entomopathogenic strain of C. nymphaeae, formerly recognized under the synonym C. gloeosporioides f. sp. ortheziidae, is under development for commercial application as a biological control agent in citrus in Brazil-the top exporter of citrus globally. The synonomy of C. gloeosporioides f. sp. ortheziidae with C. nymphaeae remains based on limited DNA sequence data and without morphological study. To qualify for future approval as a biological control agent by federal...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biological control; Colletotrichum (Sordariomycetes: Glomerellaceae); Entomopathogen.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000500201

Fee - fishing operation evaluation at Nothwest São Paulo State, Brazil
Provedor de dados: 63
Autores: Lopes,Ruy Bessa; Landell Filho,Luiz de Carvalho; Dias,Carlos Tadeu dos Santos.
Fee-fishing operations developed recently in Brazilian agricultural scenery in a rather disordered manner. This study, carried out at the northwest region of São Paulo State, Brazil, focuses on the productive performance of fee-fishing system. Several visits were made monthly to nine fee-fishing establishments, for six months. A questionnaire by owners targeting 13 indicators of the operation's productive performance. Data were submitted to multivariate analysis (MANOVA), principal component analysis (PCA) and cluster analysis. MANOVA indicated significant differences between the fee-fishing operations. The PCA analyses indicated, from the higher coefficient eigenvectors, three attributes for the lakes, such as productive system, fishery management and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fish; Multivariate analyses; Productive system; Lakes.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000600013

Rapid PCR-based assay for Sclerotinia sclerotiorum detection on soybean seeds
Provedor de dados: 63
Autores: Grabicoski,Edilaine Mauricia Gelinski; Jaccoud Filho,David de Souza; Pileggi,Marcos; Henneberg,Luciane; Pierre,Marcelo Luiz Cunha; Vrisman,Cláudio Mauricio; Dabul,Audrei Nisio Gebieluca.
Caused by Sclerotinia sclerotiorum, white mold is an important seed-transmitted disease of soybean (Glycine max). Incubation-based methods available for the detection and quantification of seed-borne inoculum such as the blotter test, paper roll and Neon-S assay are time-consuming, laborious, and not always sensitive. In this study, we developed and evaluated a molecular assay for the detection of S. sclerotiorum in soybean seeds using a species-specific PCR (polymerase chain reaction) primer set and seed soaking (without DNA extraction) for up to 72 h. The PCR products were amplified in all the samples infected with the pathogen, but not in the other samples of plant material or the other seed-borne fungi DNA. The minimum amount of DNA detected was 10 pg,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: White mold; Dissemination; Soaking seeds; Diagnostic.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162015000100069

Buttonweed emergence as affected by seed burial depth and straw on the soil surface
Provedor de dados: 63
Autores: Martins,Bianca Assis Barbosa; Christoffoleti,Pedro Jacob.
Knowledge of the effects of seed burial depth and the presence of straw on the soil surface on weed seedling emergence provides useful information for the development of weed management tactics. Buttonweed (Borreria densiflora DC.) is a troublesome weed that occurs in large infestations in soybean and sugarcane crops from north-central Brazil. This study investigated buttonweed emergence at different seed burial depths and straw amounts present on the soil surface. The experiment was conducted in greenhouse conditions, under a factorial design between four seed burial depths and four amounts of surface straw. Percent seedling emergence and fresh biomass (g) were evaluated at twenty-five days after installation (DAI). Greater buttonweed emergence occurred...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vassourinha-de-botão; Weed seedbank; No-tillage; Weed culture control.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162015000600489

Sugar-and-acid profile of Penjar tomatoes and its evolution during storage
Provedor de dados: 63
Autores: Missio,Joan Casals; Renau,Raul Marti; Artigas,Francesc Casañas; Cornejo,Jaime Cebolla.
The alcobaça mutation in the Penjar tomato (Solanum lycopersicum L.) variety alters the ripening process and confers a long shelf life (more than four months). Storage of Penjar tomatoes leads to a distinctive sensory profile valued by local consumers, who prefer aged tomatoes to fresh ones. To study chemical changes occurring during storage, we characterized the complete sugar-and-acid profile of 25 accessions at harvest and at 2 and 4 months after harvest. We found considerable variability in the sugar-and-acid profile within the Penjar variety, especially for fructose and glucose. Some accessions presented exceptionally high values for sugars, making them especially interesting for breeding programs. During postharvest, the concentration of glucose,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Tomato landrace; Alcobaça; Ripening mutant; Postharvest; Quality.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162015000400314

Interação solo-planta avaliada por modelagem estatística de espaço de estados
Provedor de dados: 63
Autores: Timm,Luis Carlos; Fante Jr.,Lorival; Barbosa,Emanuel Pimentel; Reichardt,Klaus; Bacchi,Osny Oliveira Santos.
Para estudar a interação solo-planta utilizou-se um modelo de espaço de estados (regressão dinâmica) comparativamente à um modelo de regressão estática, em versão convencional e em versão sequencial. Para tal, foram utilizados dados experimentais de densidade do solo, macroporosidade, microporosidade e porosidade total de um solo Latossolo Vermelho Escuro, além da densidade radicular por comprimento de raiz por unidade de volume, de uma cultura de aveia forrageira. Das variáveis explanatórias estudadas, a porosidade total apresentou correlação bastante significativa com a densidade radicular, considerada como a variável resposta do estudo. Um modelo de regressão estática representado na forma de espaço de estados com estimação seqüencial forneceu um...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Variabilidade espacial; Regressão dinâmica; Regressão estática; Estimação seqüencial.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000400025

Growth retardants and nutrition characteristics of the Thompson seedless and Italia grape cultivars
Provedor de dados: 63
Autores: Albuquerque,Teresinha Costa Silveira de; Dechen,Antonio Roque; Castro,Paulo Roberto de Camargo e.
Two experiments were carried out in a greenhouse to evaluate the variability in macronutrient contents in relation to growth regulator sprays on ‘Thompson Seedless’ and ‘Italia’ grapevines. The treatments were: chlormequat - 1,500mg L-1; daminozide - 3,000mg L-1; uniconazole - 30mg L-1; mepiquat chloride - 300mg .L-1 and control. The cuttings were grafted on the ‘Tropical’ rootstock and were rooted in sand. After 105 days of growth they were transplanted to 35L pots with a mixture of 1:1:1 volume of sand, soil and organic matter. Grapevines were pruned each 150 days, leaving two canes with six buds each for the ‘Italia’ cultivar and with fifteen buds for the ‘Thompson Seedless’ cultivar. Water was supplied through drip irrigation (1L/plant/day). Grapevines...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vitis sp.; Growth regulator; Mineral nutrition.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000100009

Seeding uniformity for vacuum precision seeders
Provedor de dados: 63
Autores: Bozdoğan,Ali Musa.
The performance of three vacuum precision seeders was investigated in a field study. Seeding uniformity was determined in three different within-row distances: 14, 18 and 21 cm. The seeders were operated at 1.8, 3.6, 5.4 and 7.2 km h-1. Successive seed spacing along of 3 m of row was measured in three replications on each row. For evaluating the seeding uniformity of seeders, seed spacings were analyzed using the methods (MISS, MULT, QFI and PREC). There were no differences between seeders. For P &lt; 0.01, operating speed affected MISS and QFI values, and the within-row seed spacing affected MULT and PREC values. The best operating speed was 1.8 km h-1 because of the highest QFI value (88.5%). There was no difference between 1.8 and 3.6 km h-1. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Miss index; Multiple index; Quality feed index; Within-row.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000300013

Water erosion under simulated rainfall in different soil management systems during soybean growth
Provedor de dados: 63
Autores: Engel,Fernando Luis; Bertol,Ildegardis; Mafra,Álvaro Luiz; Cogo,Neroli Pedro.
Soil management influences soil cover by crop residues and plant canopy, affecting water erosion. The objective of this research was to quantify water and soil losses by water erosion under different soil tillage systems applied on a typical aluminic Hapludox soil, in an experiment carried out from April 2003 to May 2004, in the Santa Catarina highland region, Lages, southern Brazil. Simulated rainfall was applied during five soybean cropstages, at the constant intensity of 64.0 mm h-1. Treatments were replicated twice and consisted of: i) conventional tillage on bare soil - control treatment (CTBS), ii) conventional tillage on cultivated soil (CTCS), iii) no-tillage on non tilled soil with burned crop residue (NTRB), iv) no-tillage in non tilled soil with...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil cover; Soil loss; Water loss; Soybean crop.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000200013

Chilling privation during dormancy period and carbohydrate mobilization in Japanese pear trees
Provedor de dados: 63
Autores: Marafon,Anderson Carlos; Citadin,Idemir; Amarante,Luciano do; Herter,Flávio Gilberto; Hawerroth,Fernando José.
The flower bud abortion is one of the main problems that limit commercial pear (Pyrus pyrifolia) production in the southern region of Brazil. Insufficient chilling during the dormancy period is known as the main factor of this problem. One of the hypotheses to explain this problem is that the starch mobilization and carbohydrate fluxes to the buds are impeded when mild temperatures occurred during winter. This study compared the total soluble sugars (TSS) and reducing sugars (RS) concentrations, the cell wall acid invertase (CWAI - EC 3.2.1.26) and sucrose-phosphate synthase (SPS - EC 2.4.1.14) activities in wood of branches and floral buds of Japanese pear trees cv. Housui, grafted on Pyrus calleryana and submitted to chilling conditions during the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pyrus pyrifolia; Carbohydrates; Floral bud abortion; Cell wall acid invertase; Sucrose-phosphate synthase.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000400011

Reguladores vegetais na batata cv. Monalisa, após a tuberização
Provedor de dados: 63
Autores: Tavares,Silvio; Lucchesi,Antonio Augusto.
Foram aplicados na cultura da batata cv. Monalisa, 45 dias após o plantio, retardadores de crescimento: cloreto de mepiquat, nas concentrações de 25, 50 e 100 mg L-1 e cloreto de (2 - cloroetil) trimetilamônia (chlormequat), 250, 500 e 1000 mg L-1, além do controle. O objetivo foi o aumento de produção. O delineamento adotado foi em blocos casualizados, com 7 tratamentos e 4 blocos por tratamento. Os parâmetros analisados a cada 2 semanas após as aplicações foram: área foliar, teor de clorofila total, massa de matéria seca, produção total e classificação dos tubérculos (tipos I, II, III e IV). O tratamento cloreto de mepiquat 25 mg L-1 apresentou maior taxa de degradação de clorofila. Os aumentos na produção de tubérculos do tipo I e II foram verificados...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Solanum tuberosum; Batata; Fitorreguladores; Chlormequat; Cloreto de mepiquat.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000400027

The baltic environmental information dissemination system: using environmental informatics as a tool for sustainable development in the Baltic Sea region
Provedor de dados: 63
Autores: Leal Filho,Walter.
The on-going economic development of EU-countries as well of the countries in the C&amp;E European region has been leading to a significant use of a great deal of natural resources as well as to noticeable environmental problems. The lack of a wide-spread environmental awareness from the side of those acting in various sectors (industry, public administration, users) sometimes inhibit the implementation of legislation already available as well as the introduction of new technologies deriving, from example, from marine research. An example of this state of affairs is seen in respect of the implementation of the recommendations deriving from Baltic 21 and VASAB 2010, which illustrate the advantages from a cross-sectorial, open mechanism for the dissemination...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Europe; Baltic Sea; Environment; Communication; Internet.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000300029

Balance hídrico ciclico y secuencial: estimación de almacenamiento de agua en el suelo
Provedor de dados: 63
Autores: Dourado-Neto,Durval; García y García,Axel; Fancelli,Antonio Luiz; Frizzone,José Antonio; Reichardt,Klaus.
El presente trabajo tiene por objetivo presentar un modelo mecanístico para estimar el almacenamiento de agua en el suelo, con el propósito de prever el rendimiento agrícola para cultivos anuales no fotosensibles. El movimiento y la retención de agua en el sistema agrícola, son los atributos de interés en el estudio. El rendimiento agrícola depende de los procesos básicos de fotosíntesis y respiración. También, el rendimiento depende de la especie vegetal, nutrición de la planta, energia disponible, población de plantas, plantas dañinas y población de parásitos, principalmente. Además, la evapotranspiración actual también depende de los mismos atributos y procesos. Por lo tanto, la hipótesis base del modelo es que es posible estimar el rendimiento...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Balance hídrico; Almacenamiento de agua; Modelagem.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000300005

EFEITOS DO ÁCIDO GIBERÉLICO E DA BAIXA TEMPERATURA NA GERMINAÇÃO DE SEMENTES DE KIWI (Actinidia deliciosa, A. Chev.) CULTIVAR BRUNO
Provedor de dados: 63
Autores: MATTIUZ,B; FERRI,V.C; FACHINELLO,J.C; NEDEL,J.L.
O kiwi é uma frutífera exótica de clima temperado cuja principal característica de seus frutos é o alto teor de vitamina C. A propagação por semente é de importância, pois além de produzir plantas que se destinem à porta-enxertos, contribui para a obtenção de novas cultivares. Pesquisas tem demonstrado um baixo índice de germinação das sementes de kiwi. O objetivo deste trabalho foi o de avaliar dois diferentes métodos de elevação do índice de germinação de sementes de kiwi, da cultivar Bruno: estratificação à baixa temperatura (4 0C), através dos tratamentos de zero, duas e quatro semanas; ácido giberélico (AG3) testado em cinco diferentes concentrações (0, 100, 500, 1.000 e 2.500 ppm). A testemunha, para ambos os métodos, apresentou um baixo percentual...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Actinidia deliciosa; Kiwi; Germinação; Estratificação; Ácido giberelico.
Ano: 1996
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161996000100011

Densidade e sistema de espaçamento de bananeiras ‘Nanicão’: duração do ciclo e do período de colheita
Provedor de dados: 63
Autores: Kluge,Ricardo Alfredo; Scarpare Filho,João Alexio; Victória Filho,Ricardo.
O trabalho teve como objetivo verificar a influência de diferentes densidades e sistemas de espaçamento sobre a duração do ciclo e do período de colheita de bananeiras ‘Nanicão’, em Piracicaba (SP). Quatro densidades (1333; 1666; 2222 e 3333 plantas/ha) e dois sistemas de espaçamento (retângulo e losango) foram avaliados durante as quatro primeiras produções. O sistema de espaçamento teve pouco efeito sobre a duração do ciclo e do período de colheita, enquanto que, a partir da segunda safra, estes períodos foram maiores à medida que a densidade aumentou. Na densidade 3333 plantas/ha, a soma dos quatro ciclos atingiu 55,1 meses, enquanto que nas demais densidades este período foi reduzido para 50,1 meses (2222 plantas/ha), 47,7 meses (1666 plantas/ha) e...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Distribuição de colheita; Ciclo de produção; Arranjo de plantas.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000400007

Sombric horizon: five decades without evolution
Provedor de dados: 63
Autores: Almeida,Jaime Antonio de; Lunardi Neto,Antônio; Vidal-Torrado,Pablo.
The sombric horizon is a diagnostic subsurface horizon defined in the soil classification system of the United States (Soil Taxonomy) and FAO (WRB), used to classify the soil at different categorical levels. The sombric horizon has a soil color darker than the overlying surface(s) horizon(s), and must show illuvial humus accumulation features, though they are not associated with aluminum (Al), as in the spodic horizon, nor associated with sodium (Na), as in the natric horizon. There are also criteria to distinguish it from buried A horizons. However, since the first references and proposed concept of the sombric horizon in African soils made by Sys and co-workers in the 1960s, and adopted by the Soil Taxonomy edition of 1975, few modifications have been...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Subsurface horizon; Illuvial humus accumulation; Buried A horizon; Soil classification; SiBCS.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162015000100087

Rice cold tolerance at the reproductive stage in a controlled environment
Provedor de dados: 63
Autores: Cruz,Renata Pereira da; Milach,Sandra Cristina Kothe; Federizzi,Luiz Carlos.
Cold tolerance of rice (Oryza sativa L.) during the reproductive stage is important to guarantee high yield under low temperature environments. Field selection, however, does not allow identification of adequate tolerance sources and limits selection of segregating lines due to variable temperature. The objective of this study was to devise methods for distinguishing rice genotypes as to their cold tolerance at the reproductive stage when evaluated under controlled temperature. The effect of cold temperatures was investigated in six rice genotypes at 17°C for varying length of time (three, five, seven and ten days) at two reproductive stages (microsporogenesis and anthesis). Cold tolerance was measured as the percentage of reduction in panicle exsertion...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cold temperature; Microsporogenesis; Anthesis; Panicle exsertion; Spikelet sterility.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000300007

Insetos associados às panículas de macadâmia (Macadamia integrifolia, Maiden &amp;amp; Betche)
Provedor de dados: 63
Autores: PAULINO,F.D.G.; MARCHINI,L.C.
Um experimento foi desenvolvido em um pomar de macadâmia para se determinar os insetos associados às panículas, horário e número de visitas. Os estudos foram conduzidos na Extação Experimental de Tietê (São Paulo), localizada entre as coordenadas geográficas 47º 44' W G- 47º 42 WG e 22º 59'01 S. Os insetos foram capturados com rede entomológica, mortos e identificados segundo espécie. O horário e número de visitas para A mellifera e abelhas Trigona, foi determinado através da contagem dos insetos presentes em cinco panículas, das 7:40h às 17:40h, durante 15 minutos por hora. Insetos pertencentes a 20 espécies foram capturados em oito coletas. A espécie A. mellifera foi a mais abundante e responsável por 96% das visitas, sendo o restante distribuído entre...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Macadamia integrifolia; Panícula; Insetos; Apis; Trigona; Visitas; Abelhas.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000300023

The genetic diversity among strawberry breeding resources based on SSRs
Provedor de dados: 63
Autores: Lim,Soohwan; Lee,Jeongyeo; Lee,Hyun Joo; Park,Kun-Hyang; Kim,Dae-Soo; Min,Sung Ran; Jang,Won Seok; Kim,Tae II; Kim,HyeRan.
ABSTRACT: Cultivated strawberry (Fragaria × ananassa Duch.) is a high value horticultural crop. In this study, the genetic diversity of 160 strawberry accessions was determined using five highly polymorphic simple sequence repeat (SSR) markers. Sixty different alleles were identified, with allele frequencies in the range of 0.006 to1. Similarity scores were in the range of 0.034 to 0.963 (average: 0.507). The accessions were categorized into five groups. Group 1 contained two diploid Fragaria vesca species and one unknown accession. Group 2 contained one accession (F x ananassa). Group 3 contained 20 F × ananassa accessions and six unknown accessions. Group 4 contained 48 F. × ananassa accessions, one octaploid Fragaria chiloensis species, and six unknown...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fragaria × ananassa; Simple sequence repeat; Cultivar identification.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162017000300226

Quantitative variation in the tropical maize population, ESALQ-PB1
Provedor de dados: 63
Autores: Andrade,João Antonio da Costa; Miranda Filho,José Branco de.
Good yield and intermediate plant height, ear height, and tassel size characterize the maize population ESALQ-PB1 as an outstanding breeding population. Estimates of genetic parameters are reported for 13 traits: plant height (PH), ear height (EH), ear placement (EP), tassel length (TL), tassel weight (TW), tassel branch number (TB), ear weight (EW), total grain weight (GW), ear length (EL), ear diameter (ED), kernel row number (RN), kernel number per row (KR) and prolificacy (PR). Results refer to one location and one year. Genetic variation was detected for all traits, and the estimates of the additive genetic variance are presented. The coefficients of heritability (individual basis) varied from 0.14 to 0.72 and were considered high for PH, EH and TB;...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Genetic parameters; Genetic variability; Heritability; Recurrent selection.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000200011

AUMENTO NA PRODUÇÃO DE SEMENTES DE GIRASSOL (Helianthus annuus) PELA AÇÃO DE INSETOS POLINIZADORES
Provedor de dados: 63
Autores: MORETI,A.C. de C.C.; SILVA,R.M.B. da; SILVA,E.C.A. da; ALVES,M.L.T.M.F.; OTSUK,I.P.
Foram realizados dois ensaios nos quais compararam-se plantas de girassol, do cultivar Anhandy, livremente visitadas por insetos(testemunhas) e outras impedidas de visitação por dois métodos (cobertura de plantas com gaiolas teladas, de 3m de largura, 4m de comprimento e 2m de altura, e ensacamento de capítulos com filó). O número, o peso e a porcentagem de sementes granadas foram significativamente maiores (P&amp;lt;0,05) nas plantas visitadas (579,28; 41,17g e 82,37%; 456,97; 23,44g 79,70%, nos dois ensaios), em relação às plantas cobertas com gaiolas teladas (81,53; 2,23g e 1,16% no primeiro ensaio e 111,92; 3,16g e 28,49%, no segundo). O número e o peso de sementes não granadas foram significativamente maiores (P&amp;lt;0,05) nas plantas cobertas com...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aumento de produção; Girassol; Polinização; Abelhas africanizadas; Apis mellifera.
Ano: 1996
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161996000200015

Carrot seed germination and vigor in response to temperature and umbel orders
Provedor de dados: 63
Autores: Pereira,Roseane Sousa; Nascimento,Warley Marcos; Vieira,Jairo Vidal.
Several factors may influence carrot (Daucus carota L.) crop establishment. High temperatures (35 - 40°C), for instance, may delay or inhibit carrot seed germination in the field and so compromise the stand establishment. Carrot seeds from superior umbel orders usually have better physiological quality than those of lower umbel orders. These seeds from superior umbel orders may also show a better performance in adverse conditions. In addition, seeds from different ages show differences in vigor, which affect the stand establishment, mainly under adverse conditions. The aim of this study was to verify the germination at high temperatures and the carrot seed vigor of different umbel orders of 'Brasília', as well as the different 'Alvorada' seed lots....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Daucus carota L.; Thermo-inhibition; Physiological quality.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000200006

Recurrent selection in inbred popcorn families
Provedor de dados: 63
Autores: Daros,Máskio; Amaral Jr.,Antônio Teixeira do; Pereira,Messias Gonzaga; Santos,Fabrício Santana; Gabriel,Ana Paula Cândido; Scapim,Carlos Alberto; Freitas Jr.,Silvério de Paiva; Silvério,Lucas.
Although much appreciated in Brazil, commercial popcorn is currently cropped on a fairly small scale. A number of problems need to be solved to increase production, notably the obtaintion of seeds with good agronomic traits and good culinary characteristics. With the objective of developing superior genotypes in popcorn, a second cycle of intrapopulation recurrent selection based on inbred S1 families was carried out. From the first cycle of selection over the UNB-2U population, 222 S1 families were obtained, which were then divided into six sets and evaluated in a randomized complete block design with two replications within the sets. Experiments were carried out in two Brazilian localities. The analysis of variance revealed environmental effects for all...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Breeding program; S1 families; Yield; Popping expansion.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000600008

Evaluation of various infiltration models
Provedor de dados: 63
Tipo: Info:eu-repo/semantics/article
Ano: 1997
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161997000300007

Adubos foliares quelatizados e sais na absorção de boro, manganês e zinco em laranjeira ‘Pera’
Provedor de dados: 63
Autores: Santos,Carlos Henrique dos; Duarte Filho,Jaime; Modesto,Junior Cesar; Grassi Filho,Hélio; Ferreira,Gisela.
O presente trabalho teve como objetivo comparar a eficiência de formulações de adubos foliares quelatizados na absorção dos micronutrientes boro, manganês e zinco, com a aplicação convencional de sais em plantas de laranjeira ‘Pera’ (Citrus sinensis (L.) Osbeck). Para tanto foi conduzido experimento nas dependências do Departamento de Ciência do Solo da Faculdade de Ciências Agronômicas UNESP/Campus de Botucatu, Estado de São Paulo. Utilizaram-se plantas de laranjeira ‘Pera’ (Citrus sinensis (L.) Osbeck) enxertadas sobre limoeiro ‘Cravo’ (Citrus limonia Osbeck), com 2 anos de idade, plantadas em caixas de 250 litros. Os adubos foliares utilizados foram: Grex Citros na dose de 1,0 mL L-1; Copas citros 2,0 mL L-1; Plantin Citros 1,0 mL L-1; Citrolino 2,0 mL...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Citrus sinensis; Micronutrientes; Aplicação foliar.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000400031

Resistence of Euphorbia Heterophylla L. to ALS-inhibiting herbicides in soybean
Provedor de dados: 63
Autores: Gelmini,Gerson Augusto; Victória Filho,Ricardo; Novo,Maria do Carmo de Salvo Soares; Adoryan,Márcio Luiz.
Herbicides are widely used in soybean for weed control, and the selection pressure attributed to the repeated use of herbicides with similar modes of action on the same site has caused selection for resistant biotypes within and among previously susceptible species, such as Euphorbia heterophylla L., in relation to ALS enzyme inhibitors, in the states of Paraná, Rio Grande do Sul, and São Paulo, Brazil. Seeds of E. heterophylla were collected to examine possible new cases of resistant populations and to test alternative herbicide treatments to manage these populations, in the Caarapó region, State of Mato Grosso do Sul, Brazil, in areas where plants of this species have survived continuous herbicide applications. The experiment was carried out under...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Milkweed; Cross-resistance; Imidazolinone; Sulfonylurea.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000500007

Optimization of spray deposition and Tetranychus urticae control with air assisted and electrostatic sprayer
Provedor de dados: 63
Autores: Cerqueira,Denise Tourino Rezende de; Raetano,Carlos Gilberto; Pogetto,Mario Henrique Ferreira do Amaral Dal; Carvalho,Marina Mouzinho; Prado,Evandro Pereira; Costa,Saulo Ítalo de Almeida; Moreira,Caio Alexandre Ferreira.
ABSTRACT: Improved spray deposition can be attained by electrostatically charging spray droplets, which increases the attraction of droplets to plants and decreases operator exposure to pesticide and losses to the environment. However, this technique alone is not sufficient to achieve desirable penetration of the spray solution into the crop canopy; thus, air assistance can be added to the electrostatic spraying to further improve spray deposition. This study was conducted to compare different spraying technologies on spray deposition and two-spotted spider mite control in cut chrysanthemum. Treatments included in the study were: conventional TJ 8003 double flat fan nozzles, conventional TXVK-3 hollow cone nozzles, semi-stationary motorized jet launched...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Application technology; Electrostatic spraying; Air assisted spraying; Flower sector; Two-spotted spider mite.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162017000100032

Teste de frio na avaliação do vigor de sementes de feijão
Provedor de dados: 63
Autores: Miguel,Marcelo Hissnauer; Cicero,Silvio Moure.
O presente trabalho teve como objetivo estudar o comportamento de sementes de feijão submetidas a diferentes metodologias do teste de frio, comparativamente a outros testes de vigor tradicionalmente utilizados na avaliação da qualidade fisiológica dessas sementes. As metodologias do teste de frio utilizadas foram: caixa plástica com terra, rolo de papel com terra e rolo de papel sem terra, nas temperaturas de 10ºC e de 15ºC e períodos de exposição, de três, cinco e sete dias. Paralelamente foram conduzidos teste padrão de germinação, primeira contagem de germinação, envelhecimento acelerado, condutividade elétrica e emergência de plântulas em campo. As diferentes metodologias do teste de frio foram comparadas pelo teste de Tukey e, posteriormente, foram...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phaseolus vulgaris; Qualidade fisiológica; Semente; Teste de frio; Teste de vigor.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000500027

Efeito de fontes e de aditivos na absorção de 35S via foliar pelo feijoeiro
Provedor de dados: 63
Autores: Oliveira Jr.,J.A. de; Rêgo,I.C.; Scivittaro,W.B.; Lima Filho,O.F. de; Stefanutti,R.; Gonzáles,G.R.; Boaretto,A.E.
Foi conduzido em casa de vegetação um experimento com o objetivo de avaliar o efeito de fontes de enxofre, na presença ou não de aditivos (uréia e glicose), sobre a absorção do demento pelas folhas de feijoeiro. Os tratamentos: soluções de ácido sulfúrico e de sulfates de amonio, potássio, magnésio, manganês e zinco marcadas com 35S, contendo ou não os aditivos, foram aplicados ao primeiro trifólio das plantas para avaliar a absorção e translocação de enxofre. Os resultados permitiram concluir que 33% do S adicionado foi absorvido, e desse total 27% foi translocado, não havendo influência dos aditivos sobre esses processos. O ácido sulfúrico e o sulfato de amonio destacaram-se como os melhores fornecedores de enxofre, via foliar, para o feijoeiro.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Absorção foliar; 35S; Uréia; Sacarose; Feijão; Phaseolus vulgaris.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000300008

Improvement in yield and fruit size and quality of the main Italian table olive cultivar 'Nocellara del Belice'
Provedor de dados: 63
Autores: Barone,Ettore; La Mantia,Michele; Marchese,Annalisa; Marra,Francesco Paolo.
Olive (Olea europaea L.) shows alternate bearing, with unreliable cropping patterns and inconsistent fruit size and quality every year. In many countries, thinning with naphthaleneacetic acid (NAA) is used to minimise alternate bearing behavior in olives. However, in Italy, growers are reluctant to employ this practice and no detailed knowledge is available for specific cultivars. We evaluated the effects of spraying NAA on various dates on the productive and vegetative characteristics of the main Italian table olive cultivar'Nocellara del Belice'. Trunk cross-sectional area, fruit set, fruit drop, fruit size, pit size, yield per tree, crop density and flesh to pit ratio were analysed. The NAA treatment applied on the earliest of the dates selected...
Tipo: Info:eu-repo/semantics/article
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162014000100007

Characterization of wheat genotypes for drought tolerance and water use efficiency
Provedor de dados: 63
Autores: Soares,Guilherme Filgueiras; Ribeiro Júnior,Walter Quadros; Pereira,Lucas Felisberto; Lima,Cristiane Andréa de; Soares,Daiane dos Santos; Muller,Onno; Rascher,Uwe; Ramos,Maria Lucrecia Gerosa.
ABSTRACT: The selection of wheat genotypes according to their drought tolerance is essential to off-season cultivation. The objective of this work was to characterize wheat genotypes through yield and components, morphological characteristics under water stress, and irrigated water use efficiency in the Cerrado region in Brazil. Genotypes were planted during the winters of 2016 and 2017 since there is no precipitation during this season and water levels can be measured. They were then submitted to four water regimes: WR1, WR2, WR3, and WR4, representing 100 %, 83 %, 50 %, and 30 % of evapotranspiration replacement. The following variables were evaluated: peduncle length (PL), number of ears m−2 (NE m−2), hectoliter weight (HW), thousand grain weight (TGW),...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Triticum aestivum; Plant phenotyping; Water regimes; Irrigation gradient.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000500602

Growth and yield models for eucalyptus stands obtained by differential equations
Provedor de dados: 63
Autores: Mendonça,Adriano Ribeiro de; Calegario,Natalino; Silva,Gilson Fernandes da; Chaves e Carvalho,Samuel de Pádua.
ABSTRACT: The main purpose of this study was to assess nonlinear models generated by integrating the basal area growth rate to estimate the growth and yield of forest stands. The database was collected from permanent sample units, in Paraopeba county, in the state of Minas Gerais, Brazil. The stands were represented by Eucalyptus camaldulensis × Eucalyptus urophylla hybrid trees, with 3 × 3 meters of spacing. The data were divided into two groups: fitting and validating databases. Two nonlinear models (Strategy A and Strategy B) were developed using differential equations to estimate the basal area growth and yield of the sample units. The logistic model was fitted to estimate the volumetric yield as a function of age, site index and basal area. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nonlinear models; Compatible models; Biological consistency.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162017000500364

Efeito da acidificação, fermentação e adição de cálcio na qualidade de couve-flor (Brassica oleraceae L.) processada pelo calor
Provedor de dados: 63
Autores: Nogueira,J.N.; Cantarelli,P.R.; Gallo,C.R.; Moreno,I.A.M.; Matsuura,F.C.A.V.
O presente trabalho foi desenvolvido com o objetivo de fornecer informações, não encontradas na literatura, sobre o efeito da acidificação (cinco ácidos orgânicos), fermentação e adição de cálcio na qualidade de couve-flor (cultivar Shiromaru III), processada pelo calor. A qualidade da couve-flor processada foi avaliada através de análise física, química, microbiológica e sensorial, após dois meses de armazenamento à temperatura ambiente. Os resultados mostraram a possibilidade de processar couve-flor enlatada, de alta qualidade, em pequenas indústrias, com redução de gastos em equipamentos, instalações e energia. O procedimento da acidificação oferece também uma segurança maior para o consumidor, pois elimina possíveis riscos de incidência do botulismo.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Couve-flor; Acidificação; Processamento térmico; Fermentação de hortaliça.
Ano: 1993
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161993000100018

Environmental impact of the Brazilian Agrarian Reform process from 1985 to 2001
Provedor de dados: 63
Autores: van de Steeg,Jeannette Antoinette; Sparovek,Gerd; Ranieri,Simone Beatriz Lima; Maule,Rodrigo Fernando; Cooper,Miguel; Dourado Neto,Durval; Alves,Marcelo Corrêa.
During the past 20 years, most settlements of the Brazilian Agrarian Reform (AR) have been established in or near better-preserved natural ecosystems, where environmental impact is likely to be negative and contribute to natural resources degradation. The objective of this work is providing a first, comprehensive insight of the impacts related to the environmental quality of these settlements, based on the primary survey of 4,340 AR settlements installed between 1985 and 2001. An index was calculated to integrate different aspects of environmental impacts in one single number. The index showed significant regional variation, with lower values (low environmental quality) for the North and Northeast of Brazil, intermediate values for the Central-west and...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Brazil; Deforestation; Environmental index.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000200010

Photosynthetic light response of the C4 grasses Brachiaria brizantha and B. humidicola under shade
Provedor de dados: 63
Autores: Dias-Filho,Moacyr Bernardino.
Forage grasses in tropical pastures can be subjected to considerable diurnal and seasonal reductions in available light. To evaluate the physiological behavior of the tropical forage grasses Brachiaria brizantha cv. Marandu and B. humidicola to low light, the photosynthetic light response and chlorophyll contents of these species were compared for plants grown outdoors, on natural soil, in pots, in full sunlight and those shaded to 30 % of full sunlight, over a 30-day period. Both species showed the ability to adjust their photosynthetic behavior in response to shade. Photosynthetic capacity and light compensation point were lower for shade plants of both species, while apparent quantum yield was unaffected by the light regime. Dark respiration and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Carbon assimilation; Chlorophyll content; Light compensation point; Pasture.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000100009

Agricultural use of treated sewage effluents: agronomic and environmental implications and perspectives for Brazil
Provedor de dados: 63
Autores: Fonseca,Adriel Ferreira da; Herpin,Uwe; Paula,Alessandra Monteiro de; Victória,Reynaldo Luiz; Melfi,Adolpho José.
In many studies worldwide the use of treated sewage effluents (TSE) as water and nutrient sources in agricultural irrigation have been introduced as a viable alternative for wastewater destination in the environment. Considering agronomic and environmental aspects the objectives of this review were: (i) to present an overview of TSE irrigation on different agro-systems (annual crops, orchards, forests and forages); and (ii) to show the principal changes on chemical, physical and microbiological soil characteristics after TSE application. Various studies have revealed that the nutrient supply only by TSE irrigation was not sufficient to meet plant nutrient requirements resulting in yield decreases. The problem could be solved by an adapted...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Wastewater; Water reuse; Nutrient source; Agriculture; Environmental impact.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000200014

Biological control of golden apple snail, Pomacea canaliculata by Chinese soft-shelled turtle, Pelodiscus sinensis in the wild rice, Zizania latifolia field
Provedor de dados: 63
Autores: Dong,Shengzhang; Zheng,Guowan; Yu,Xiaoping; Fu,Changhuan.
The wild rice, Zizania latifolia Turcz, used to be one of the important aquatic vegetables cultivated in China. Recently, the golden apple snail - GAS (Pomacea canaliculata (Lamarck)) was found to be a major invasive pest attacking Z. latifolia. To control efficiently GAS, predation by the Chinese soft-shelled turtles (Pelodiscus sinensis) on GAS was evaluated in laboratory and field trials. P. sinensis had a strong predatory capacity and selectivity for GAS both in laboratory and field conditions. All the sizes of P. sinensis prefer to capture smaller snails. The optimum number of P. sinensis released in Z. latifolia field was dependent on the density of over-wintered GAS, and varied between 30 and 50 turtles per 666.7 m². The number of GAS declined in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Invasive pest; Predatory capacity; Turtles; Snails.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162012000200009

Soil loss risk and habitat quality in streams of a meso-scale river basin
Provedor de dados: 63
Autores: Silva,Alexandre Marco da; Casatti,Lilian; Alvares,Clayton Alcarde; Leite,Aline Maria; Martinelli,Luiz Antonio; Durrant,Steven F.
Soil loss expectation and possible relationships among soil erosion, riparian vegetation and water quality were studied in the São José dos Dourados River basin, State of São Paulo, Brazil. Through Geographic Information System (GIS) resources and technology, Soil Loss Expectation (SLE) data obtained using the Universal Soil Loss Equation (USLE) model were analyzed. For the whole catchment area and for the 30 m buffer strips of the streams of 22 randomly selected catchments, the predominant land use and habitat quality were studied. Owing mainly to the high soil erodibility, the river basin is highly susceptible to erosive processes. Habitat quality analyses revealed that the superficial water from the catchments is not chemically impacted but suffers...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Erosion modeling; Expectation of soil loss map; Riparian vegetation; Water quality.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000400004

Capture of hypothenemus hampei ferrari (coleoptera, scolytidae) in response to trap characteristics
Provedor de dados: 63
Autores: Silva,Flávia Cloclet da; Ventura,Maurício Ursi; Morales,Lauro.
Traps lured with semiochemical have been proposed to manage the coffee berry borer, coffee planting is however made under several environmental conditions that may affect the efficacy of traps. Several trap designs and variations were proposed and, therefore, a series of field experiments was carried out to capture coffee berry bores in traps disposed in a low density coffee plantations in the Northern part of the State of Paraná, Brazil. Traps were composed of plastic bottles (2 L) with a window (13 × 18 cm). Ethanol (E), Methanol (M) and coffee oil alone did not improve the capture when transparent traps with a 2 mm hole in the vial dispenser were used; traps lured with E : M mixtures (1:1, 1:2, 1:3) caught similar and higher number of insects than the...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Semiochemical; Attractant; Volatile; Trap color.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000600010

Metais pesados em plantas de milho cultivadas em Latossolos repetidamente tratados com biossólido
Provedor de dados: 63
Autores: Anjos,Ana Rosa Martins dos; Mattiazzo,Maria Emilia.
A presença de metais pesados em biossólidos é motivo de preocupação quando do uso agrícola desse resíduo em função da possibilidade de absorção desses metais pelas plantas crescendo nesse solo. A fitodisponibilidade de metais pesados, em solos repetidamente tratados com biossólido, foi avaliada num experimento em vasos de 0,5 m³, contendo LATOSSOLO AMARELO Distrófico (LAd) e LATOSSOLO VERMELHO Distrófico (LVd). O experimento foi montado no delineamento em blocos ao acaso, com quatro tratamentos (LAd+lodo, LAd, LVd+lodo e LVd) e quatro repetições utilizando milho como planta teste. Incorporou-se biossólido, proveniente da Estação de Tratamento de Esgotos ETE-SABESP-Barueri, São Paulo, na camada 0-0,2 m dos solos durante um período de até doze meses antes do...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays; Lodo de esgoto; Cd; Cr; Cu; Mn; Ni; Pb; Zn.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000400027

Aplicação de KCN e linamarina e a incompatibilidade de enxertia por translocação no clone de seringueira IPA 1
Provedor de dados: 63
Autores: Moraes,Larissa Alexandra Cardoso; Moraes,Vicente Haroldo de Figueiredo; Castro,Paulo Roberto de Camargo e.
Para caracterizar evidências indiretas do envolvimento dos glicosídeos cianogênicos da seringueira, cujo principal componente é a linamarina, no desenvolvimento dos sintomas de incompatibilidade de enxertia por translocação apresentados pelo clone de painel IPA 1 (Hevea brasiliensis) em enxertos de copa com vários clones de outras espécies de Hevea, tentou-se sua reprodução através da aplicação de soluções com concentrações de cianeto de potássio (KCN) e linamarina no caule do clone IPA 1 e dos clones Fx 4098 e Fx 3864, que não apresentam reação de incompatibilidade com os mesmos clones incompatíveis com o IPA 1. A aplicação de soluções de KCN no caule provocaram rápida coagulação do látex nos laticíferos do IPA 1 com concentrações muito baixas de KCN e...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hevea brasiliensis; Glicosídio cianogênico; Cianogênese.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000400011

Lixiviação de nitrato em um Latossolo Amarelo distrófico tratado com lodo de esgoto e cultivado com canadeaçúcar
Provedor de dados: 63
Autores: Oliveira,Fernando Carvalho; Mattiazzo,Maria Emilia; Marciano,Cláudio Roberto; Moraes,Sérgio Oliveira.
Uma das preocupações com o uso de lodo de esgoto no solo agrícola referese ao risco de poluição das águas subterrâneas causado pela lixiviação de nitrato, o que torna necessário mais estudos a respeito. Este trabalho teve por objetivo avaliar as perdas de NNO3-, por lixiviação, num Latossolo Amarelo Distrófico tratado com lodo de esgoto e cultivado com canadeaçúcar. Os tratamentos com lodo de esgoto aumentaram a concentração de NNO3- na solução do solo a 0,3, 0,6 e 0,9 m de profundidade. Nestes mesmos tratamentos foi verificado acúmulo de Norgânico na camada 0 - 0,2 m do solo e de NNO3- + N-NH4+ na camada de 0,9 1,2 m. A aplicação, em solos, de doses de lodo a partir de 33 Mg ha-1 ocasionou riscos de poluição das águas subterrâneas com nitrato,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lodo de esgoto; Lixiviação; Nitrato; Poluição.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000100026

Phosphorus accumulation in a southern Brazilian Ultisol amended with pig manure for nine years
Provedor de dados: 63
Autores: Tiecher,Tales; Brunetto,Gustavo; Rheinheimer,Danilo; Gatiboni,Luciano Colpo; Comin,Jucinei José; Schmitt,Djalma Eugênio; Tiecher,Tadeu Luis; Ambrosini,Vítor Gabriel.
ABSTRACT: This study evaluated P pools after nine years of successive application of either pig slurry (PS) or deep pig litter (DL) in a no-till Ultisol from southern Brazil. The experiment was established in Dec 2002 with the treatments control, application of 90 and 180 kg N ha−1 N as PS and as DL. In Mar 2010, soil samples were taken at six layers up to 30 cm deep. Total organic and inorganic P were assessed by the ignition method, and P compounds classes were evaluated by 31P-NMR spectroscopy. Total soil P increased proportionally with the P amount applied via DL and PS. Only DL application increased soil organic P, mainly at the highest dose and in the uppermost soil layers. The application of high doses of manure to these soils under no-till to meet...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: P-NMR; Organic P; Manure; Orthophosphate.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000301403

Insights from a large-scale inventory in the southern Brazilian Atlantic Forest
Provedor de dados: 63
Autores: Vibrans,Alexander Christian; Gasper,André Luís de; Moser,Paolo; Oliveira,Laio Zimermann; Lingner,Débora Vanessa; Sevegnani,Lucia.
ABSTRACT: A key issue in large-area inventories is defining a suitable sampling design and the effort required to obtain reliable estimates of species richness and forest attributes, especially in species-diverse forests. To address this issue, data from 418 systematically distributed 0.4 ha plots were collected. Estimators of nonparametric species richness were employed to assess the floristic representativeness of data collected in three forest types in the Brazilian Atlantic Forest. The sampling sufficiency of forest attributes was evaluated as a function of sample size. Altogether, 831 tree/shrub species were recorded. The data acquired through the systematic sampling design were representative of both species richness and basal area. The confidence...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Forest attributes estimation; Species richness; Forest monitoring; Systematic sampling; Secondary forests.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000101000

Leaf anatomy of rubber-tree clones
Provedor de dados: 63
Autores: Martins,Maria Bernadete Gonçalves; Zieri,Rodrigo.
Rubber trees are easily recognizable for being woody, medium to large-sized plants, having a typical deciduous behavior, and especially because they produce latex. The purpose of this work was to study the anatomy and morphology of the leaf, comparing rubber tree &amp;91;Hevea brasiliensis (Willd. ex Adr. de Juss.) Muell.-Arg.&amp;93; clones (RRIM 600 and GT 1) grafted on the same root stock (Tjir 1), grown under the same climatic and soil conditions. This study allowed clones to be differentiated and also provided information on the location and disposition of laticifers in the leaf tissue. Cross sections of the mesophyll, center ribbing and petiole regions were made, followed by usual permanent histological blade methods. Biometric analyses of tissue...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hevea brasiliensis; Leaf; Clones.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000400015

Nutrient content of biomass components of Hamlin sweet orange trees
Provedor de dados: 63
Autores: Mattos Jr.,Dirceu; Quaggio,José Antônio; Cantarella,Heitor; Alva,Ashok Kumar.
The knowledge of the nutrient distribution in trees is important to establish sound nutrient management programs for citrus production. Six-year-old Hamlin orange trees [Citrus sinensis (L.) Osb.] on Swingle citrumelo [Poncirus trifoliata (L.) Raf. x Citrus paradisi Macfad.] rootstock, grown on a sandy Entisol in Florida were harvested to investigate the macro and micronutrient distributions of biomass components. The biomass of aboveground components of the tree represented the largest proportion of the total. The distribution of the total tree dry weight was: fruit = 30.3%, leaf = 9.7%, twig = 26.1%, trunk = 6.3%, and root = 27.8%. Nutrient concentrations of recent mature leaves were in the adequate to optimal range as suggested by interpretation of leaf...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Citrus sinensis; Mineral nutrition; Dry matter; Chemical analysis; Nutrient distribution.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000100023

Can land use changes alter carbon, nitrogen and major ion transport in subtropical brazilian streams?
Provedor de dados: 63
Autores: Silva,Daniela Mariano Lopes da; Ometto,Jean Pierre Henry Balbaud; Lobo,Gré de Araújo; Lima,Walter de Paula; Scaranello,Marcos Augusto; Mazzi,Edmar; Rocha,Humberto Ribeiro da.
Several studies in tropical watersheds have evaluated the impact of urbanization and agricultural practices on water quality. In Brazil, savannas (known regionally as Cerrados) represent 23% of the country's surface, representing an important share to the national primary growth product, especially due to intense agriculture. The purpose of this study is to present a comprehensive evaluation, on a yearly basis, of carbon, nitrogen and major ion fluxes in streams crossing areas under different land use (natural vegetation, sugar cane and eucalyptus) in a savanna region of SE Brazil. Eucalyptus and sugar cane alter the transport of the investigated elements in small watersheds. The highest concentration of all parameters (abiotic parameters, ions, dissolved...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Savanna; Nutrients; Watershed; Sugar cane; Eucalyptus.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000400002

Physico-chemical characterization of 'Zarco HS' yellow bell pepper for different ripeness stages
Provedor de dados: 63
Autores: Antoniali,Silvia; Leal,Paulo Ademar Martins; Magalhães,Ana Maria de; Fuziki,Rogério Tsuyoshi; Sanches,Juliana.
The bell pepper presents alterations in its composition and its properties with the process of senescence during ripening. These composition and textual factors are part of the quality of the fruit and therefore of the selection. This permits the correct knowledge of the factors necessary for post-harvest measures, so that they can be adequately applied. The aim of this study is to analyze the 'Zarco HS' yellow pepper at various levels of ripeness taking into account its physico-chemical properties (titratable acidity, pH, total soluble solids, water content, and ascorbic acid), in order to understand this behavior during the ripening process. Bell peppers were separated based on their yellow percentage, which varied from 0% to 100%, and for each...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Capsicum annuum; Quality; Ripening.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000100003

Produção e valor nutritivo da grama bermuda Florakirk [Cynodon dactylon (L.) pers.] em diferentes idades de crescimento
Provedor de dados: 63
Autores: Vieira,Andréa Campmany; Haddad,Cláudio Maluf; Castro,Flávio Geraldo Ferreira; Heisecke,Osvaldo Rubens Peralta; Vendramini,João Maurício Bueno; Quecini,Vânia Maria.
O experimento foi conduzido em Itapetininga/SP, numa pastagem de Florakirk (Cynodon dactylon) formada há um ano, com o objetivo de avaliar a produção, composição químico-bromatológica e digestibilidade do cultivar em função da sua idade de crescimento. Utilizou-se o delineamento de blocos ao acaso, com 6 tratamentos (idades de crescimento definidas por cortes realizados aos 20, 30, 40, 50, 60 e 70 dias após o corte de uniformização) e 4 repetições. A produção de matéria seca da parte aérea aumentou de forma quadrática (P&lt;0,05), com valor máximo de 215 g m-2, aos 70 dias. A digestibilidade verdadeira in vitro da matéria orgânica decresceu entre 20 e 70 dias (de 711 para 549 g kg-1), enquanto os teores de fibra em detergente neutro e fibra em detergente...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Idade de crescimento; Valor nutritivo; Composição química; Produção vegetal.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000500021

Geostatistical analysis for soil moisture content under the no tillage cropping system
Provedor de dados: 63
Autores: Grego,Célia Regina; Vieira,Sidney Rosa; Antonio,Aline Maria; Della Rosa,Simone Cristina.
Experiments in agriculture usually consider the topsoil properties to be uniform in space and, for this reason, often make inadequate use of the results. The objective of this study was to assess the variability for soil moisture content using geostatistical techniques. The experiment was carried out on a Rhodic Ferralsol (typic Haplorthox) in Campinas, SP, Brazil, in an area of 3.42 ha cultivated under the no tillage system, and the sampling was made in a grid of 102 points spaced 10 m x 20 m. Access tubes were inserted down to one meter at each evaluation point in order to measure soil moisture contents (cm³ cm-3) at depths of 30, 60 and 90 cm with a neutron moisture gauge. Samplings were made between the months of August and September of 2003 and in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Neutron moisture gauge; Semivariogram; Spatial and temporal variability.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000400005

Humic substances and its distribution in coffee crop under cover crops and weed control methods
Provedor de dados: 63
Autores: Martins,Bruno Henrique; Araujo-Junior,Cezar Francisco; Miyazawa,Mario; Vieira,Karen Mayara.
ABSTRACT Humic substances (HS) comprise the passive element in soil organic matter (SOM), and represent one of the soil carbon pools which may be altered by different cover crops and weed control methods. This study aimed to assess HS distribution and characteristics in an experimental coffee crop area subjected to cover crops and cultural, mechanical, and chemical weed control. The study was carried out at Londrina, in the state of Paraná, southern Brazil (23°21’30” S; 51°10’17” W). In 2008, seven weed control/cover crops were established in a randomized block design between two coffee rows as the main-plot factor per plot and soil sampling depths (0-10 cm, 10-20 cm, 20-30 cm and 30-40 cm) as a split-plot. HS were extracted through alkaline and acid...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: UV-Vis spectroscopy; Conservation agriculture; Soil organic matter; Carbon content; Chemical fractionating.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000400371

Growth and yield of corn irrigated with saline water
Provedor de dados: 63
Autores: Blanco,Flávio Favaro; Folegatti,Marcos Vinícius; Gheyi,Hans Raj; Fernandes,Pedro Dantas.
Corn (Zea mays L.) is an important crop in Brazil and is cultivated in all regions, including the semi-arid area of Brazil, where the occurrence of irrigation water with high concentration of salts is common. Evaluating the growth and yield of the maize hybrid 'AG 6690' irrigated with water of different salinity levels was the objective of this experiment. Sowing was performed in pots with 12 seeds on May 23, 2003, and seedlings were thinned to two plants per pot. Irrigation was accomplished when the mean soil matric potential of each treatment was approximately -30 kPa using water with seven different electrical conductivities (ECi), varying from 0.3 to 4.5 dS m-1, which were obtained by addition of NaCl and CaCl2 in the equivalent proportion of 1:1. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays L.; Tolerance to salinity; Soil solution; Leaf area; Evapotranspiration.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000600002

Respiratory quotient: innovative method for monitoring ‘Royal Gala’ apple storage in a dynamic controlled atmosphere
Provedor de dados: 63
Autores: Weber,Anderson; Brackmann,Auri; Both,Vanderlei; Pavanello,Elizandra Pivotto; Anese,Rogério de Oliveira; Thewes,Fabio Rodrigo.
Apples (Malus domestica, Borkh.) which are not stored at low temperature or in a properly controlled atmosphere (CA) may have a high metabolic rate during the postharvest stage resulting in losses in quality. The aim of this study was to evaluate the quality of ‘Royal Gala’ apple fruit stored in accordance with a new method of dynamic controlled atmosphere (DCA).The respiratory quotient (RQ) was monitored at two temperatures which were then compared using a commercially available technology based on chlorophyll fluorescence DCA (DCA-CF) and static CA. Ethylene production and respiration rates were lower in apples stored in DCA than in CA, as a result of lower 1-aminocyclopropane-1-carboxylate oxidase activity, especially in apples stored in DCA-RQ2. Flesh...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ethanol; Ethylene; Physiological disorders; Chlorophyll fluorescence.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162015000100028

Key factors that influence for seasonal production of Guinea grass
Provedor de dados: 63
Autores: Araujo,Leandro Coelho de; Santos,Patricia Menezes; Rodriguez,Daniel; Pezzopane,José Ricardo Macedo.
ABSTRACT: Climate, soil and management are the main drives for growth and production of tropical pastures. Thus, a better understanding of the effects of these factors and their interactions under climate conditions is required to obtain effective management options. Here, we used data from two field trials to research on climate and management interactions on the production seasonality of Panicum maximum Jacq. Treatments included four sampling times (250, 500, 750, and 1000 °C accumulated) during eight regrowth period, under irrigated and rainfed conditions and, cuts were made to simulate grazing intensity. All treatments were arranged in a completely randomized block design with four replications. At each sampling time, basal tillers were sampled to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Daylength; Degree-days; Mombaça; Tropical forage; Water deficit.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162018000300191

Mineral weathering in acid saprolites from subtropical, southern Brazil
Provedor de dados: 63
Autores: Clemente,Celso Augusto; Azevedo,Antonio Carlos de.
Because weathering of minerals releases chemical elements into the biogeochemical cycle, characterization of their weathering products helps to better model groundwater quality, formation of secondary minerals and nutrient flux through the trophic chain. Based on microscopic and elemental analyses, weathering of riodacite from Serra Geral formation was characterized and weathering paths proposed. Three weathering paths of plagioclase phenocrystals were identified: plagioclase to gibbsite (Pg1); plagioclase to gels and gibbsite (Pg2); and plagioclase to gels, gibbsite and kaolinite (Pg3). Pyroxenes weathered to smectite and goethite (Py1), or to goethite and gibbsite (Py2), and magnetite weathered directly into iron oxides. Rock matrix comprises 90% of rock...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Paraná Basin; Riodacites; Plagioclases; Pyroxenes; Magnetites.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000600007

REFLECTÂNCIA ESPECTRAL DE DIABÁSIO E ARGILITO DA REGIÃO DE PIRACICABA-SP E DE RIOLITO DA REGIÃO DE PALMAS-PR
Provedor de dados: 63
Autores: Demattê,Jóse Alexandre M.; Noronha,Norberto C.; Clemente,Celso Augusto; Marconi,Arary; Oviedo,Alexandre F.P.
O objetivo deste trabalho foi o de caracterizar radiometricamente três tipos de rochas, analizando os espectros de reflectância de diabásio em três níveis de alteração (camada sã e duas camadas de alterações), riolito (uma amostra) e argilito (quatro amostras). As amostras do diabásio e argilito foram coletadas na região de Piracicaba, SP e a do riolito na região de Palmas, PR. Foram obtidas curvas de reflectância dessas amostras em laboratório, na faixa de 400 a 2500 nm. As principais conclusões foram: a. Foi possível discriminar o diabásio do riolito, assim como dos argilitos, através da intensidade, forma e feições de absorção das curvas espectrais; b. A análise descritiva das curvas de reflectância do diabásio permitiu a discriminação das rochas em...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Reflectância espectral; Rochas; Intemperismo; Bandas de absorção.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000200003

Cúpulas comerciais para produção de geléia real e rainhas em colméias de abelhas Apis mellifera
Provedor de dados: 63
Autores: Garcia,Regina Conceição; Souza,Darclet Teresinha Malerbo de; Nogueira-Couto,Regina Helena.
O objetivo do presente ensaio foi testar quatro tipos comerciais de cúpulas distintas quanto à coloração, altura, volume e diâmetro, na aceitação das larvas transferidas e na produção de geléia real e rainhas. A cúpula que apresentou maior aceitação foi a alaranjada (55,6%), seguida da amarela (37,3%), azul (36,5%) e branca (26,9%). As cúpulas que apresentaram maior peso de geléia real foram branca (347,7 mg), alaranjada (312,3 mg), amarela (284,0 mg) e azul (202,8 mg). O peso das larvas retiradas no momento da coleta de geléia real não apresentou diferença nas cúpulas de diferentes colorações sendo, em média, 42,0 ± 49,6 mg. O peso das rainhas recém-emergidas foi maior na cúpula branca (190,2 mg), seguida da alaranjada (181,0 mg), amarela (175,4 mg) e...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Apis mellifera; Cúpula real; Produção de rainha.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000200028

Mathematical tool to size rural digesters
Provedor de dados: 63
Autores: Florentino,Helenice de Oliveira.
Anaerobic digesters have been highlighted due to the current energy crisis and its consequent search for alternative energy sources, allied to the intense process of livestock farming and agriculture modernization, which besides demanding a lot of energy, produces a great amount of crop and animal residues, most of the times generating sanitary problems. The aim of this work is to provide a mathematical tool to establish parameters for projects of construction of rural digesters, considering the response to energy demand, the suitability of the dimensions of the systems, yield factors and the guarantee of functionality. Non-linear optimization models, of easy resolution, for the three main types of rural digesters were formulated in this way. With the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mathematical model; Optimization; Parameters for designing.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000100028

Low carbon/nitrogen ratio increases laccase production from basidiomycetes in solid substrate cultivation
Provedor de dados: 63
Autores: D'Agostini,Érica Clarissa; Mantovani,Talita Rafaele D'Agostini; Valle,Juliana Silveira do; Paccola-Meirelles,Luzia Doretto; Colauto,Nelson Barros; Linde,Giani Andrea.
Basidiomycetes are laccase producers used for hydrolysis of lignocellulosic byproducts in fermentative processes and could be used on biofuel production or ruminant feeding. The objective of this study was to evaluate the effect of concentrations of non-protein nitrogen sources on laccase production and mycelial growth of Pleurotus ostreatus, Lentinula edodes and Agaricus blazei. The fungi were grown on soybean hulls to which urea (U), ammonium sulfate (AS) or mixture of AS:U (1:1) were added to achieve carbon/nitrogen (C/N) ratios of 5, 15, 20 or 30. The average longitudinal mycelial growth was measured and laccase activity was determined by the oxidation of 2,2'-azino-bis-3-ethylbenzothiazoline-6-sulfonic acid. Higher C/N ratios increased mycelial growth...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Industrial byproduct; Lignocellulolytic; Enzyme; Lignolytic; Soybean hull.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000300004

Partial diallel to evaluate the combining ability for economically important traits of papaya
Provedor de dados: 63
Autores: Marin,Sergio Lucio David; Pereira,Messias Gonzaga; Amaral Júnior,Antonio Teixeira do; Martelleto,Luiz Aurélio Peres; Ide,Carlos David.
The dependence of Brazil on imported improved papaya seeds was the main motivation for this research that primarily intended to evaluate the combining ability of eight genotypes from the 'Solo' group, crossed with eight genotypes from the 'Formosa' group following a partial diallel scheme. The traits mean fruit weight, brix degree and flavor revealed prevalence of additive effects in both genetic groups, while plant height was preponderantly additive only for the 'Solo' genotypes. On the other hand, the yield trait expressed additive superiority for the 'Formosa' genotypes. For intrapopulation breeding for higher yield, the indicated genotypes are 'Maradol' and 'Cariflora' from the 'Formosa' group as well 'Sunrise Solo 783' and 'Sunrise Solo TJ' from the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Carica papaya L.; Heterosis; Hybrids.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000600005

Competitivity of the common-bean plant relative to the weed alexandergrass [Brachiaria plantaginea (link) hitch.]
Provedor de dados: 63
Autores: Passini,Telma; Christoffoleti,Pedro Jacob; Yada,Inês Fumiko Ubukata.
Methodologies of competitive interaction quantification between weeds and crops are not widely elucidated and compared in the literature. The competitive ability of common-bean (Phaseolus vulgaris) relative to alexandergrass (Brachiaria plantaginea) was assessed and two approaches of replacement series experiment analysis were compared. The response of the species to the presence of each other at different densities and proportion was evaluated. Replacement series at total densities of 625, 816 and 1,111 plants m-2 were performed at the proportions of common-bean:alexandergrass of 100:0 (pure stand of common-bean), 75:25, 50:50, 25:75 and 0:100% (pure stand of alexandergrass), at four replicates in a randomized block design. Data analyses were performed by...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Replacement series design; Qualitative analysis; Quantitative analysis.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000200009

Development of Bemisia tabaci (Gennadius,1889) biotype B on Lycopersicon spp. genotypes
Provedor de dados: 63
Autores: Marilene,Fancelli; Vendramim,José Djair.
Whiteflies are phytophagous insects, whose nymphs and adults suck the phloem sap, causing direct damage due to host plant weakness. In tomato (Lycopersicon spp.) crops, they are important vectors of limiting fitoviruses. The objective of this study was to determine the effects of Lycopersicon spp. genotypes on Bemisia tabaci (Gennadius, 1889) biotype B development under greenhouse conditions. The evaluated genotypes were LA462 (L. peruvianum), LA716 (L. pennellii), LA1584 (L. pimpinellifolium), LA1609 (L. peruvianum), LA1739 (L. hirsutum), P25 (L. esculentum), PI134417 (L. hirsutum f. glabratum) and Santa Clara (L. esculentum). LA716 was non-preferred for oviposition by the whitefly, which suggests an antixenotic effect. LA1584 showed an antibiotic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bemisia argentifolii; Aleyrodidae; Whitefly; Biology; Tomato.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000400007

MATÉRIA SECA E ABSORÇÃO DE NUTRIENTES EM FUNÇÃO DO ESPAÇAMENTO E DA DENSIDADE DE SEMEADURA EM ARROZ DE TERRA ALTA
Provedor de dados: 63
Autores: Crusciol,Carlos Alexandre Costa; Machado,José Ricardo; Arf,Orivaldo; Rodrigues,Ricardo Antonio Ferreira.
Foi instalado um experimento em condições de campo, em um Latossolo Vermelho escuro, epi-eutrófico, textura argilosa, em Selvíria-MS, com arroz de sequeiro cv. IAC 201, estudando-se três espaçamentos entre fileiras (30, 40 e 50 cm) e três densidades de semeadura (100, 150 e 200 sementes viáveis/m2). Foram avaliadas a produção de matéria seca da parte aérea no momento do florescimento e determinados os teores e quantidades de N, P, K, Ca, Mg e S absorvidos, assim como a eficiência de utilização de nutrientes. A redução do espaçamento entre fileiras aumentou a produção de matéria seca da parte aérea e a quantidade de nutrientes absorvidos. A variação da densidade de semeadura não afetou os parâmetros estudados. A redução do espaçamento entre fileiras...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: População; Arranjo espacial; Nutrição mineral; Eficiência de utilização de nutrientes.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000100010

Seed research for improved technologies
Provedor de dados: 63
Autores: Bino,R.J.; Jalink,H.; Oluoch,M.O.; Groot,S.P.C.
The production of high-quality seed is the basis for a durable a profitable agriculture. After production, seed is processed, conditioned, stored, shipped and germinated. For quality assurance, seed quality has to be controlled at all steps of the production chain. Seed functioning is accompanied by programmed transitions from cell proliferation to quiescence upon maturation and from quiescence to reinitiation of cellular metabolism upon imbibition. Despite the obvious importance of these control mechanisms, very little information is available at the molecular level concerning those elements that regulate seed germination. In the present study, the induction of cell cycle activity and the regulation of ß-tubulin expression is related to the water content...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Seed; Quality.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000500004

Seed improvement by selection and invigoration
Provedor de dados: 63
Autores: Powell,A.A.
The basis of differences in seed quality are described for two groups of crops, grain legumes and vegetables and approaches to the improvement of quality are proposed. In grain legumes the major factors affecting seed quality are imbibition damage, seed ageing and their interaction. It is proposed that use of seed vigour tests, specifically the electrical conductivity test, to identify the incidence of imbibition damage and ageing allows the selection of seed lots for sale and for use under different field conditions. Alternatively in grain legume species in which there is a genotypic influence on predisposition to imbibition damage the approach to seed improvement may lie through selection in breeding programmes. Thus identification of testa...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Grain legumes; Vegetables; Vigour; Imbibition damage; Ageing; Testa pigmentation; Invigoration treatments; Metabolic repair.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000500023

Drought sress and the distribution of vegetative and reproductive traits of a bean cultivar
Provedor de dados: 63
Autores: Nuñez Barrios,Abelardo; Hoogenboom,Gerrit; Nesmith,Dennis Scott.
Soil water deficits may affect the location and pattern of flower and pod production on different stem axes of a bean plant. The objective of this study was to understand the effect of drought stress on the distribution of flowers and pods on the main stem and on branches of bean plants. The experiment was conducted in a shelter field facility. Water stress was imposed from the end of the vegetative stage to physiological maturity and soil water was measured with a neutron probe every two weeks. Formation of flowers at each node of the main stem was monitored at 44 days after planting (DAP) and formation of pods at 55DAP and 65 DAP. Dry weight of stems and leaves as well leaf area were measured during the middle of the pod filling stage (55DAP). The total...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dry beans; Soil water; Flowers; Pod setting; Branches.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000100004

Cytogenetic mapping of the ALMT (aluminum-activated malate transporter) gene in wheat genotypes
Provedor de dados: 63
Autores: Oliveira,Érica Cristina de; Pinto-Maglio,Cecília Alzira Ferreira.
ABSTRACT: Presence of the ALMT1 (aluminum-activated malate transporter) gene confers resistance to aluminum toxicity in Triticum aestivum (common wheat). No resistant cultivars of Triticum turgidum ssp. Durum Desf. (durum wheat) have been registered in Brazil. The aim of this study was to map the ALMT1 through application of the FISH (fluorescence in situ hybridization) technique in five wheat genotypes, common and durum, from the Active Germplasm Bank (AGB) of the Instituto Agronômico (IAC): BH 1146, P19, P33, Anahuac, and IAC 1003. FISH-ALMT1 signals were registered in Anahuac (sensitive) chromosomes and in BH 1146, P19, and P33 (resistant) chromosomes. In the three resistant genotypes, a characteristic double FISH signal was found, located in different...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Triticum sp.; Molecular cytogenetics; Fluorescence in situ hybridization; Aluminum tolerance; Toxicity.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000501102

Logistic rice model for dry matter and nutrient uptake
Provedor de dados: 63
Autores: García y García,Axel; Dourado-Neto,Durval; Basanta,Maria del Valle; López Ovejero,Ramiro Fernando; Favarin,José Laércio.
The temporal variation of cumulative dry matter can be represented by a sigmoidal curve and the temporal variation of nutrient uptake follows this characteristic shape. Therefore, modeling the temporal variation of cumulative dry matter allows estimating nutrient uptake along the crop cycle. The objective of this study was to propose a sine model to estimate dry matter and macronutrient uptake, and to estimate the moments of maximum N and K uptake rates for the rice crop. The field experiment was carried out on a wetland area of Piracicaba, SP, Brazil, consisting of an Humic Haplaquept. The chosen rice variety was IAC 103, a middle season cycle and high yield. Observed variables were dry matter of different plant parts (root, leaf and stem, and panicle)...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Modeling; Sine function; Macronutrients.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000300011

Participação de autores e revisores externos na Scientia Agricola
Provedor de dados: 63
Tipo: Info:eu-repo/semantics/other
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000200001

Determination of methanol residues in crude glycerol for animal feed by gas chromatography
Provedor de dados: 63
Autores: Nazato,Carina; Romero,Alessandra de Cássia; Abdalla,Adibe Luiz.
ABSTRACT: Crude glycerol is a major by-product of biodiesel production and is an economical additive feed for ruminants. However, residual methanol in crude glycerol can be harmful to animal health. Several methods exist for quantifying methanol residues in biodiesel, yet few have been described that identify the methanol level in crude glycerol. We propose a method for determining the methanol level in crude glycerol destined for animal feed. Crude glycerol was extracted from the headspace and quantified by gas chromatography using a flame ionization detector (GC-FID). The method was linear up to 0.5 % of methanol. The limits of detection (LOD) and quantification (LOQ) were 0.015 and 0.031 %, respectively. No significant matrix effects were observed....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Co-product; Feedstuff; Biodiesel; Toxic compound; Ruminant.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162019001600527

Épocas de semeadura, densidades de plantas e desempenho vegetativo de cultivares de soja
Provedor de dados: 63
Autores: Martins,Mônica Cagnin; Câmara,Gil Miguel Sousa; Peixoto,Clovis Pereira; Marchiori,Luís Fernando Sanglade; Leonardo,Vanessa; Mattiazzi,Patricia.
O trabalho foi conduzido em Piracicaba, SP, com o objetivo de avaliar o desenvolvimento de três cultivares de soja cultivados em épocas de semeadura normal e tardia, em cinco densidades de plantio. Foram utilizados os cultivares de soja IAC-17, IAC-12 e IAC-19 com ciclos de maturação precoce, semi precoce e médio, respectivamente, conduzidos no espaçamento de 0,50 m e nas densidades de 10, 15, 20, 25 e 30 plantas.m-1. Adotou-se o delineamento em blocos ao acaso com 15 tratamentos (3 cultivares x 5 densidades), repetidos três vezes. Cada parcela foi composta por 5 linhas com 5 metros, onde foram avaliadas as seguintes características: altura final de planta, diâmetro da haste principal, número de nós e número de ramificações por planta. As conclusões foram:...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soja; Cultivar; Época de semeadura; Densidade de planta.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000400012

AVALIAÇÃO DA DISPONIBILIDADE DO FÓSFORO NO SOLO POR MÉTODOS ISOTÓPICO, QUÍMICOS E BIOLÓGICO
Provedor de dados: 63
Autores: MOREIRA,A; MALAVOLTA,E; VIRGENS FILHO,A.C; SILVEIRA,R.L.V.A; ABREU,J. B. R.
Com o objetivo de avaliar o teor de fósforo disponível no solo por métodos isotópico (valor E), químicos (extração com Bray 1, Mehlich 1, Mehlich 3 e resina) e biológico (matéria seca), relacionando-os com as fontes e doses de fósforo, foi conduzido um ensaio em casa de vegetação. O solo utilizado foi um latossolo vermelho-amarelo distrófico. O delineamento experimental foi o inteiramente casualizado 4x3: 4 doses de P (0, 50, 100 e 200 mg kg-1) e 3 fontes de termofosfato (Yoorin MC, Yoorin MG e Yoorin semi acabado) e mais um tratamento com superfosfato triplo (100 mg kg-1 de P) com 3 repetições. Os extratores Mehlich 1 e resina apresentam alta correlação entre o fósforo extraível do solo e o absorvido pela planta quando se utiliza termofosfato. As maiores...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Termofosfato; Resina; Arroz; Oryza sativa; Fósforo; Latossolo vermelho amarelo distrófico; Solo; Estratores.
Ano: 1997
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161997000100011

Depression by inbreeding after four sucessive self-pollination squash generations
Provedor de dados: 63
Autores: Cardoso,Antonio Ismael Inácio.
The strategy for breeding F1 hybrid squash is to develop parental lines through self-pollination. However, it increases plant mean homozygosis, which is not the natural genetic state of a cross-pollinated species, and can cause "inbreeding depression". The objective of this work was to evaluate this depression with sucessive generations of self-pollination (without selection) in Cucurbita moschata, cv. Piramoita. Populations were obtained from lines with one to four generations of self-pollination (obtained by the SSD method), from the original cv. Piramoita (population S0). Randomized blocks were used with five treatments (different generations of self-pollination - S0 to S4), six replicates and five plants per plot. Regression analysis was made by the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cucurbita moschata; Cucurbits; Selfing.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000200016

Relationship between nitrogen sources, germination and vigor of soybean seeds
Provedor de dados: 63
Autores: Marcos-Filho,J.; Custodio,C.C.; Camara,G.M.S.; Marcos,E.A.; Miranda,R.E.
This research was conducted in two experimental areas; the first had been under cultivation with Bradyrhizobium japonicum anually inoculated for several years and the second was cultivated with sugarcane for many years receiving only mineral fertilization. Mineral nitrogen (urea and ammonium) effect was compared with the effects of inoculant treatments (liquid and peat carriers) on plant development, yield and seed quality. After harvesting, seeds were stored under normal environmental conditions and tested periodically. Germination, accelerated aging, electrical conductivity and seedling emergence tests showed that seeds coming from the area where inoculation was practiced have better quality. Best plant performance regarding plant height at different...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycine max; Seeds; Inoculation; Germination; Vigor.
Ano: 1994
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000200017

Sward structure and herbage yield of rotationally stocked pastures of 'Marandu' palisadegrass [Brachiaria brizantha (A.Rich.) Stapf] as affected by herbage allowance
Provedor de dados: 63
Autores: Braga,Gustavo José; Pedreira,Carlos Guilherme Silveira; Herling,Valdo Rodrigues; Luz,Pedro Henrique de Cerqueira; Lima,César Gonçalves de.
In ruminant-forage systems herbage allowance (HAL) has a major impact on grazing intensity and sward structure, affecting animals, plants, and ultimately, pasture yield. Data on HAL responses of tropical cultivated pastures are scarce and this information may be useful in optimizing pasture utilization. The objective of this study was to describe and contrast sward structure and herbage accumulation responses of 'Marandu' palisadegrass [Brachiaria brizantha (A.Rich.) Stapf] pastures to HAL during two grazing seasons (warm-rainy season of 2003 and 2004). Treatments were four daily HAL levels, 5, 10, 15 and 20 kg herbage mass per 100 kg live weight (%) in a rotational stocking system with 35 days of grazing cycle (28-day rest; 7-d grazing). Post-graze swards...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Herbage accumulation; Sward height; Light interception; Forage mass.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000200003

VIGOR DE SEMENTES DE MILHO (Zea mays L.) AVALIADO PELA PRECOCIDADE DE EMISSÃO DA RAIZ PRIMÁRIA
Provedor de dados: 63
Autores: Toledo,Francisco Ferraz de; Novembre,Ana Dionisia da Luz Coelho; Chamma,Helena Maria Carmignani Pescarin; Maschietto,Renata Waldemarin.
Foi desenvolvido trabalho baseado na determinação da precocidade da emissão da raiz primária de sementes de milho, em dez lotes de um mesmo cultivar. Este processo constou da distribuição de 200 sementes de cada lote sobre folhas de papel umedecido e, também, rolos de papel, que permaneceram em germinador a 25 °C; de 12 em 12 horas, aquelas que apresentaram emissão da raiz primária foram removidas, contadas e anotadas. Para estabelecer comparação entre os métodos e os lotes, paralelamente, as sementes eram avaliadas através da determinação do grau de umidade, dos testes de germinação e de vigor (primeira contagem, teste de frio com solo e emergência de plântulas em campo). Concluiu-se que há possibilidade de se utilizar o teste de emissão da raiz primária,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sementes; Milho; Vigor.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000100026

Doses and forms of application of phosphorus in vernalized garlic
Provedor de dados: 63
Autores: Büll,Leonardo Theodoro; Costa,Mirian Cristina Gomes; Novello,Aline; Fernandes,Dirceu Maximino; Villas Bôas,Roberto Lyra.
Because of low P mobility in the soil, the effect of its position in relation to the root is of great practical significance, especially in soils with extreme P deficiency. Experiments with vegetables under this approach are not frequent. This work studies the influence of the position of phosphate fertilizer on nutrient absorption and on the production of vernalized garlic (Allium sativum L.) bulbs. Two experiments were carried out in pots (16 L) containing samples of a Typic Quartzipsamment and of a Typic Hapludox in a factorial scheme with four P doses (50, 100, 200, and 400 mg P dm-3) and five positions relative to the incorporation (I) or furrow application (S), where L1 = 100%I, L2 = 75%I and 25%S, L3 = 50%I and 50%S, L4 = 25%I and 75%S, and L5 =...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Typic Quartzipsamment; Typic Hapludox; Garlic; Phosphorus position; Phosphate fertilizer.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000500009

Diet crude protein content and sources for lactating dairy cattle
Provedor de dados: 63
Autores: Imaizumi,Hugo; Santos,Flávio Augusto Portela; Bittar,Carla Maris Machado; Correia,Paulo Sérgio; Martinez,Júnio César.
Feeding extra protein as an attempt to increase amino acid flux to the intestine may increase lactational performance of dairy cattle. The objective of this study was to compare lactating dairy cow diets containing 16% crude protein (CP), adequate in rumen degradable protein (RDP) and metabolizable protein (MP) according to NRC (2001), with diets containing 17.5% CP. Forty-two Holstein cows (27 primiparous and 15 multiparous, with 172 days in milk) were used in a 3 ´ 3 Latin Square design with 14 replicates. Control diet consisted of 16% CP, adequate in RDP and MP . Crude protein content of diets was increased to 17.5% by feeding extra soybean meal and cottonseed meal (SBCS17.5) to increase diet MP, or extra urea (U-17.5) to increase diet RDP. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cottonseed meal; Metabolizable protein; Protein sources; Rumen degradable protein; Soybean meal.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000100003

Carneiro hidráulico com tubulação de alimentação em aço galvanizado e em PVC
Provedor de dados: 63
Autores: Abate,Caroline; Botrel,Tarlei Arriel.
A recente crise da energia convencional tem ocasionado a exploração de fontes alternativas de energia. O bombeamento de água utilizando carneiro hidráulico é amplamente empregado em propriedades onde a energia elétrica é escassa ou inexistente. Procurando dar subsídios técnicos para a utilização do PVC nos sistemas de alimentação de um carneiro hidráulico, foi desenvolvido um experimento com objetivo de avaliar o desempenho de um carneiro hidráulico quando alimentado por uma tubulação de PVC e outra de aço galvanizado, sob três alturas de queda (2,1, 3,8 e 4,7 m). Foi utilizada a equação de D'Aubussion's para a avaliação do rendimento, calculado a partir de leituras de altura de recalque, vazão de escape, vazão de recalque e altura de alimentação. Pode-se...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Aríete hidráulico; Golpe de aríete.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000100029

Monitoring leaf area index at watershed level through NDVI from Landsat-7/ETM+ data
Provedor de dados: 63
Autores: Xavier,Alexandre Cândido; Vettorazzi,Carlos Alberto.
Leaf area index (LAI) is an important parameter of the vegetation canopy, and is used, for instance, to estimate evapotranspiration, an important component of the hydrological cycle. This work analyzed the relationship between LAI, measured in field, and NDVI from four dates (derived from Landsat-7/ETM+ data), and with such vegetation index, to generate and analyze LAI maps of the study area for the diverse dates. LAI data were collected monthly in the field with LAI-2000 equipment in stands of sugar cane, pasture, corn, eucalypt, and riparian forest. The relationships between LAI and NDVI were adjusted by a potential model; 57% to 72% of the NDVI variance were explained by the LAI. LAI maps generated by empirical relationships between LAI and NDVI showed...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biophysical variable; Remote sensing; Spectral vegetation indices.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000300001

Environmental quality improvement of agricultural lands through silvopasture in southeastern United States
Provedor de dados: 63
Autores: Nair,Vimala D.; Haile,Solomon G.; Michel,Gérard-Alain; Nair,P.K. Ramachandran.
We hypothesized that, because of the ability of trees to sequester carbon (C) in the deep soil profile and remove excess nutrients from soils, the silvopastoral agroforestry system could enhance the environmental quality of the agricultural lands. To test this hypothesis, two sets of experiments were conducted in two soil orders in Florida, Spodosols and Ultisols, with two major objectives: i) determining the soil C accumulation and tracing the plant sources of C in soil fractions, and ii) quantifying water soluble phosphorus (WSP) and estimating the Soil P Storage Capacity (SPSC). Total C in both soil orders was greater under silvopasture than in treeless pastures, particularly at lower depths. Stable-isotope signature analysis suggested that C3 plants...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Carbon sequestration; Nutrients; Soil P storage capacity; Treeless pasture.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000500009

TAMANHO DA ÁREA DE FORRAGEAMENTO DO CUPIM SUBTERRÂNEO Heterotermes tenuis (ISOPTERA; RHINOTERMITIDAE) EM CANA-DE-AÇÚCAR
Provedor de dados: 63
Autores: Almeida,José Eduardo Marcondes; Alves,Sérgio Batista; Walder,Júlio Marcos Melges.
Estudou-se a área de forrageamento do cupim Heterotermes tenuis utilizando-se a isca Termitrap® marcada com o radioisótopo 32P. O experimento foi conduzido numa área com cana-de-açúcar, em Piracicaba-SP. Foram localizados 20 focos de H. tenuis, com iscas. Em cada um desses focos aplicou-se uma isca Termitrap® impregnada com 18,5 MBb (500 mCi) 32P na forma de fosfato de sódio diluído em 15 ml de água destilada. Ao redor das iscas marcadas, foram instaladas iscas sem marcador em quatro pontos: Norte, Sul, Leste e Oeste, eqüidistantes de 1, 5, 10 e 20 metros. Cada tratamento foi representado por um foco previamente determinado e marcado e uma das distâncias estipuladas para a isca de monitoramento, sendo repetido de 4 a 6 vezes. Após 15 dias da marcação,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Iscas; Heterotermes tenuis; Radioisótopo; Forrageamento.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000200009

Preprocessing procedures and supervised classification applied to a database of systematic soil survey
Provedor de dados: 63
Autores: Valadares,Alan Pessoa; Coelho,Ricardo Marques; Oliveira,Stanley Robson de Medeiros.
ABSTRACT: Data Mining techniques play an important role in the prediction of soil spatial distribution in systematic soil surveying, though existing methodologies still lack standardization and a full understanding of their capabilities. The aim of this work was to evaluate the performance of preprocessing procedures and supervised classification approaches for predicting map units from 1:100,000-scale conventional semi-detailed soil surveys. Sheets of the Brazilian National Cartographic System on the 1:50,000 scale, “Dois Córregos” (“Brotas” 1:100,000-scale sheet), “São Pedro” and “Laras” (“Piracicaba” 1:100,000-scale sheet) were used for developing models. Soil map information and predictive environmental covariates for the dataset were obtained from the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Machine learning algorithms; Random forest; Tacit soil-landscape relationships; Digital soil mapping.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162019001500439

Perspectives on biodiversity science in Brazil
Provedor de dados: 63
Autores: Scarano,Fabio Rubio.
Biodiversity issues in Brazil have reached a critical point. On one hand, biodiversity science is increasing in quality and quantity, however on the other, habitat destruction in all major biomes still maintain alarmingly high rates. This paradox, from a scientific perspective, has two central tenets that scientists should focus on. First, although science related to biodiversity is of high standard in Brazil as compared to that of peers in the world, it is still not at the leading edge of research. Second, the wealth of information built up by strong research programmes, such as Biota/Fapesp - to which this special issue of Scientia Agricola is dedicated - is beginning to help decision-makers to improve precision and quality of their decisions concerning...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biodiversity/ecosystem function; Global change; Leading-edge science; Scientific communication; Scientific education.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000400016

Efeitos do ácido indolbutírico e da época de coleta no enraizamento de estacas de goiabeira (Psidium guajava L.)
Provedor de dados: 63
Autores: Tavares,M. S. W.; Kersten,E.; Siewerdt,F.
Este trabalho foi desenvolvido com o objetivo de verificar o efeito de concentrações de ácido indolbutírico (AIB) e da época de coleta sobre o enraizamento de estacas de goiabeira (Psidium guajava L.), oriundas de plantas produtoras de frutos de polpa vermelha e de polpa branca, em estufa com nebulizacão intermitente. Utilizou-se estacas apicais com um par de folhas e estacas medianas com dois pares de folhas, ambas cortadas pela metade. Após serem padronizadas em aproximadamente 15 cm de comprimento, procedeu-se ao tratamento introduzindo em torno de 1 cm da base da estaca em AIB na forma de pó, nas concentrações de zero, 4000, 5000, 6000 e 7000 ppm. Em seguida, colocou-se o material em sacos de polietileno perfurado, contendo cinza de casca de arroz como...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Estaquia; Goiabeira; AIB; Ácido indolbutírico.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000200018

Alfalfa yield and quality as function of nitrogen fertilization and symbiosis with Sinorhizobium meliloti
Provedor de dados: 63
Autores: Oliveira,Wladecir Salles de; Oliveira,Patrícia Perondi Anchão; Corsi,Moacyr; Duarte,Fábio Rodrigo Sanches; Tsai,Siu Mui.
The efficiency of the symbiotic process between alfalfa (Medicago sativa L.) and Sinorhizobium meliloti can be drastically affected by soil nitrogen. This research evaluates how mineral fertilization affects the contribution of symbiosis to the yield and quality of alfalfa in two experiments under controlled conditions, and a third one in the field. Under controlled conditions, positive effect of nitrogen fertilizer was observed, whereas, in the field, negative effect of the mineral nitrogen (450 kg ha-1 year-1) on the symbiotic process was observed, with reduction of nodulation and nitrogenase activity. However, there was no effect on yield, total nitrogen concentration, crude protein, non-protein nitrogen and digestibility in relation to the treatment...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Medicago sativa L.; Biological nitrogen fixation.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000400013

Efeito da época de estaquia, fitorreguladores e ácido bórico no enraizamento de estacas de porta-enxertos de videira
Provedor de dados: 63
Autores: Leonel,S.; Rodrigues,J.D.
Estudaram-se as interações entre os ácidos indol-butírico, alfa-naftaleno-acético e bórico no desenvolvimento de raízes em estacas de porta-enxertos de videira (Vitis vinifera L.). As estacas tinham aproximadamente 25 cm de comprimento e, necessariamente, 2 gemas, sendo obtidas em três épocas distintas (janeiro, abril e julho) e colocadas para enraizar em bandejas de isopor, tendo vermiculita como substrato, e mantidas sob nebulização. O tratamento constou da imersão de 2,5 cm da base das estacas em soluções, por um tempo de imersão de 1 minuto. Os tratamentos utilizados corresponderam a: 1 .000; 2.000 e 5.000 ppm de IBA; 1.500 e 3.000 ppm de NAA; 150 microgramas/ml de H3BO3; IBA 1.000; 2.000 e 5.000 + H3BO3 150 microgramas/ml e H2O. Avaliaram-se a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vitis vinifera; Auxinas; Enraizamento; Estaquia; Boro.
Ano: 1993
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161993000100005

Espectrofotometria de proteínas totais em plasma de sangue bovino por análise em fluxo
Provedor de dados: 63
Autores: Luca,Gilmara Caseri de; Reis,Boaventura Freire dos.
A concentração de proteína total em plasma é um parâmetro utilizado no controle da saúde e nutrição animal, sendo que a faixa de concentração considerada normal para animais em bom desenvolvimento situa-se entre 60 e 85 g L -1. Os métodos analíticos propostos para esta determinação geralmente apresentam como limitação a excessiva manipulação das amostras. Este trabalho descreve o desenvolvimento de um procedimento de análises em fluxo para a determinação de proteína total em plasma de sangue bovino, empregando o método do Biureto. O sistema em fluxo, constituído por um injetor comutador automático e uma válvula solenóide de três vias controlados por um microcomputador, foi projetado visando permitir diluição em linha das amostras. Um fator de diluição era...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Determinação de proteína; Diluição em linha; Sistema de análise em fluxo; Plasma animal.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000200007

EFEITO DO ESPAÇAMENTO ENTRE PLANTAS E DA ARQUITETURA VARIETAL NO COMPORTAMENTO VEGETATIVO E PRODUTIVO DA MANDIOCA
Provedor de dados: 63
Autores: IROLIVEA,E.A.M.; CÂMARA,G.M.S.; NOGUEIRA,M.C.S.; CINTRA,H.S.
Com o objetivo de avaliar o comportamento vegetativo e produtivo de três cultivares de mandioca (Manihot esculenta Crantz) em relação à arquitetura da parte aérea, em quatro espaçamentos, realizou-se experimento de outubro de 1993 a julho de 1994, em solo Podzólico Vermelho Escuro Latossólico, do Município de Piracicaba, SP. Os cultivares SRT 59 com ramificação baixa em ângulo aberto, IAC 576-70 com ramificação alta em ângulo fechado e IAC 1287 sem ramificação, foram conduzidos sob os espaçamentos de 1,0 m x 0,4 m; 1,0 m x 0,6 m; 1,0 m x 0,8 m e 1,0 m x 1,0 m. O experimento foi delineado em blocos ao acaso com parcelas subdivididas, onde os espaçamentos representam as parcelas e os cultivares subparcelas. Cada parcela foi constituída por 4 linhas de 10...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Manihot esculenta; Cultivares; Ramificação.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000200016

Estimation of productive losses caused by withdrawal of antibiotic growth promoter from pig diets – Meta-analysis
Provedor de dados: 63
Autores: Cardinal,Kátia Maria; Andretta,Ines; Silva,Marcos Kipper da; Stefanello,Thais Bastos; Schroeder,Bruna; Ribeiro,Andréa Machado Leal.
ABSTRACT: This study was designed to simulate productive and economic losses due to the withdrawal of antibiotic growth promoters (AGP) from pig diets. Articles that compared diets with AGP (AGP+) or without AGP (AGP–) for pigs were collected from electronic databases and the performance results were entered in a database. A meta-analysis was performed following the sequence: graphical analysis, correlation, and variance-covariance. The performance results observed in the meta-analysis, feed cost, and AGP costs were used to build equations to estimate the economic effect of withdrawing AGP. The database comprised 81 scientific articles containing 103 experiments totalizing 42,923 pigs. Avilamycin (24.7 %) was the most frequent AGP in the database, followed...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Addditive; Feed conversion; Feed cost; Productive cost; Swine.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000700401

Ambient pH-regulated enzime secretion in endophytic and pathogenic isolates of the fungal genus Colletotrichum
Provedor de dados: 63
Autores: Maccheroni Jr.,Walter; Araújo,Welington Luiz; Azevedo,João Lúcio.
In fungi a genetic system ensures that enzymes are secreted mainly at ambient pH values corresponding to their optima of activity. Although a great deal of information has been obtained concerning this environmental response, there is a lack of studies involving phytopathogenic, endophytic and entomopathogenic fungi as well as different aspects of fungus-host interactions. This study compares in a plate-clearing assays, the effect of ambient pH in the secretion of amylase, cellulase, lipase, pectinase and protease by endophytic, phytopathogenic, and entomopathogenic isolates belonging to several species of Colletotrichum. All enzymes were secreted in a pH-dependent manner by all isolates. Endophytes and pathogens showed distinct patterns of protease...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glomerella; Enzyme secretion; Endophytes; Pathogenic fungi; PacC.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000300010

Desenvolvimento de Spodoptera frugiperda (J. E. Smith) em genótipos de milho tratados com extrato acetato de etila de Trichilia pallida (Swartz)
Provedor de dados: 63
Autores: Roel,Antonia Railda; Vendramim,José Djair.
Avaliou-se o efeito do extrato acetato de etila obtido de folhas e ramos de Trichillia pallida, (a 0,001%), sobre o desenvolvimento de Spodoptera frugiperda alimentada com folhas de quatro genótipos de milho, um suscetível, 'Piranão', e três resistentes, 'CMS 14C', 'Zapalote Chico', 'ESALQ-PB-4', à referida praga. Os parâmetros biológicos avaliados foram peso, duração e viabilidade das fases larval e pupal. Verificou-se que o extrato provocou alongamento da fase larval e redução dos pesos larval e pupal e que os genótipos resistentes não confirmaram esse comportamento pois quando comparados ao genótipo suscetível, apenas reduziram o peso pupal. Não houve interação significativa entre os fatores genótipo e extrato.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lagarta-do-cartucho; Planta inseticida; Resistência de plantas; Extrato orgânico.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000300010

Parasitoids of Phyllocnistis citrella in Jaguariúna, state of São Paulo, Brazil, before and after the introduction of Ageniaspis citricola
Provedor de dados: 63
Autores: Sá,Luiz Alexandre Nogueira de; Costa,Valmir Antonio; Oliveira,Wagner Portes de; Almeida,Gilberto Ribeiro de.
The citrus leafminer, Phyllocnistis citrella (Gracillariidae), is among the main pests of citrus in Brazil. The objective of this work was to conduct a survey of parasitoids attacking CLM in Jaguariúna, State of São Paulo, Brazil, before and after the introduction of Ageniaspis citricola (Encyrtidae). Collections of new leaves were made weekly at citrus groves from July-1997 to April-1999. During the survey period, A. citricola was introduced in the area. Before this introduction, Galeopsomyia fausta (Eulophidae) was the predominant species (about 91.83% of the species composition), but A. citricola became predominant after its establishment (60.10% against 38.30% G. fausta). Other parasitoids found were Cirrospilus sp. C (Eulophidae), Horismenus sp....
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Leafminer; Biological control; Parasitoids; Citrus.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000400033

Chemical amendment and phytostabilization of an industrial residue contaminated with Zn and Cd
Provedor de dados: 63
Autores: Santos,Fabiana Soares dos; Magalhães,Márcio Osvaldo Lima; Mazur,Nelson; Amaral Sobrinho,Nelson Moura Brasil do.
Phytostabilisation of a contaminated soil with heavy metals is considered a very appropriate technology to reduce erosion and dispersion of contaminants. A greenhouse study was conducted to evaluate the effects of both chemical amendments (calcium silicate and brewery sludge), and phytoremediation using the grass Brachiaria decumbens, on an industrial residue contaminated with Zn and Cd (industrial residue). Industrial residue samples placed into 30 L containers were amended with 20% brewery sludge, calcium silicate (2%, 3%), and 20% of brewery sludge + calcium silicate (2.5%, 4%), and were compared to the control treatment (non-amended residue). After pH stabilization, B. decumbens plants were grown on all treatments in order to evaluate the ability of...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Phytoremediation; Inertization; Contamination; Heavy metals.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000500008

Variações no balanço catiônico do solo induzidas pela adubação potássica e efeitos na cultura do alho vernalizado
Provedor de dados: 63
Autores: BÜLL,L.T.; VILLAS BÔAS,R.L.; NAKAGAWA,J.
Avaliaram-se os efeitos das relações (Ca+Mg)/K do solo sobre o desenvolvimento, absorção de nutrientes e produção de bulbos na cultura do alho cv. "Roxo Pérola de Caçador" conduzindo experimento no período de maio a outubro de 1990 em vasos de cimento amianto contendo 50 kg de terra, em casa de vegetação telada. Os tratamentos consistiram de aplicações de doses de potássio visando atingir relações (Ca+Mg)/K no complexo de troca do solo próximas a 170; 50; 35; 20; 12,5; 7,5; 5,0; 3,5 e 2,0. Verificaram-se aumentos na concentração de K, Ca e Mg na solução do solo proporcionais à elevação do teor de K trocável. As concentrações foliares de K e Mn diminuiram proporcionalmente às relações (Ca+Mg)/K do solo, ocorrendo o inverso com as concentrações de Ca e Mg. A...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Alho; Adubação potássica; Nutrição catiônica; Equilíbrio Ca:Mg:K.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000300014

Efeito da profundidade de semeadura na emergência de plântulas de tomate (Lycopersicon esculentum Mill.)
Provedor de dados: 63
Autores: Tillmann,M.A.A.; Piana,Z.; Cavariani,C.; Minami,K.
Com o objetivo de avaliar o efeito da profundidade de semeadura na emergência de plântulas de tomate (Lycopersicon esculentum Mill.), utilizou-se sementes da cultivar Tropic à profundidade de 0,5; 1,5; 2,5; 3,5; 4.5 e 5,5 cm em substrato solo e areia na proporção de 3:1, mantendo-se constante o teor de água do mesmo em 70% da capacidade de campo. O delineamento experimental empregado foi inteiramente casualizado com quatro repetições de 50 sementes por tratamento, quantificando-se os efeitos das profundidades através das determinações de índice e velocidade de emergência e estande final em porcentagem. Os resultados revelaram que a profundidade de semeadura de 1,5 cm proporcionou índice de velocidade de emergência e estande final, significativamente...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Tomate; Lycopersicon esculentum Mill.; Profundidade; Emergência.
Ano: 1994
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000200010

Métodos de remoção da mucilagem e qualidade fisiológica de sementes de tomate (Lycopersicon esculentum, Mill.)
Provedor de dados: 63
Autores: Cavariani,C.; Piana,Z.; Tillmann,M.A.A.; Minami,K.
Objetivando estudar diferentes métodos de remoção da mucilagem e a qualidade de sementes de tomate (Lycopersicon esculentum Mill.), conduziu-se um experimento, em delineamento inteiramente casualizado com quatro repetições. Após extração manual, sementes e mucilagens foram submetidas aos seguintes tratamentos de remoção: lavagem imediata, fermentação por três dias, ácido clorídrico a 2,5% (25 ml/kg, durante 2 horas), ácido acético a 10% (25 ml/kg de material) e hidróxido de amônia a 2,5% (25 ml/kg, durante 2 horas). Seguiu-se a avaliação da qualidade fisiológica das sementes através das determinações de porcentagem de germinação e vigor, pela porcentagem de emergência em areia, condutividade elétrica e pesos das matérias verde e seca de plântulas. Os...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Tomate; Lycopersicon esculentum Mill.; Sementes; Mucilagem; Qualidade fisiológica.
Ano: 1994
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000100007

Non-conventional P sources for zebu cows in Brazil
Provedor de dados: 63
Autores: Vitti,D.M.S.S.; Abdalla,A.L.; Lopes,H.O.S.; Pereira,E.A.; Meirelles,C.F.
To evaluate non-conventional phosphorus sources, a group of 400 Nellore cows mantained under pasture received a mineral mixture with different P sources (group I: superphosphate - 500 ppm P; group II: superphosphate - 340 ppm P plus rock phosphate Patos 160 ppm P; group III: superphosphate 340 ppm P plus dicalcium phosphate 160 ppm P; group IV - dicalcium phosphate 500 ppm P). There were no differences in pregnancy rate, calving rate and calving interval. A fluorine deposition in bone was observed for the treatments with superphosphate and rock phosphate (66.92 ± 15.53; 69.97 ± 6.5 and 64.05 ± 3.35% respectively for group I, II and III). Superphosphate was almost as good dicalcium phosphate to provide phosphorus for grazing cows and there was a potentially...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phosphorus; Cattle; Rock phosphate; Fluorine.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000100014

Root phosphatase activity, plant growth and phosphorus accumulation of maize genotypes
Provedor de dados: 63
Autores: Machado,Cynthia Torres de Toledo; Furlani,Ângela Maria Cangiani.
The activity of the enzyme phosphatase (P-ase) is a physiological characteristic related to plant efficiency in relation to P acquisition and utilization, and is genetically variable. As part of a study on maize genotype characterization in relation to phosphorus (P) uptake and utilization efficiency, two experiments were set up to measure phosphatase (P-ase) activity in intact roots of six local and improved maize varieties and two sub-populations. Plants were grown at one P level in nutrient solution (4 mg L-1) and the P-ase activity assay was run using 17-day-old plants for varieties and 24-day-old plants for subpopulations. Shoot and root dry matter yields and P concentrations and contents in plant parts were determined, as well as P-efficiency...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays L.; Genetic variability; Enzymatic activity; Nutritional efficiency.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000200015

Concentração de bap e a eficiência de micropropagação de bananeira tetraplóide (grupo AAAB)
Provedor de dados: 63
Autores: Oliveira,Roberto Pedroso de; Silveira,Daniela Garcia; Silva,Sebastião de Oliveira e.
Com o objetivo de desenvolver um procedimento eficiente para a produção de mudas de bananeiras tetraplóides (Musa sp. cv. FHIA-01, grupo AAAB) estudou-se o efeito do clone no desenvolvimento in vitro dos explantes e as taxas de contaminação, multiplicação e nível de oxidação em meios de cultura contendo cinco concentrações de BAP. Na fase de introdução in vitro dos explantes, foi observada elevada taxa de contaminação (22,32%), causada, principalmente, por bactérias. No entanto, os níveis de contaminação decresceram na seqüência dos subcultivos, tendo sido de 1,07% no oitavo subcultivo. As maiores taxas de multiplicação foram obtidas no meio de cultura MS com 4,0 mg L-1 de BAP, em média de 2,65 plântulas por subcultivo, possibilitando a produção estimada...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Musa sp.; Concentrações de BAP; Propagação in vitro; Tetraplóide (grupo AAAB).
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000100013

Ploidy level and caffeine content in leaves of Coffea
Provedor de dados: 63
Autores: Silvarolla,Maria Bernadete; Mazzafera,Paulo; Lima,Marinez Muraro Alves de; Medina Filho,Herculano Penna; Fazuoli,Luiz Carlos.
Several species of Coffea and varieties of C. arabica differing in chromosome number had their caffeine content determined in the leaves. For Coffea arabica var. "Angustifolia", var. "Caturra" and var. "Icatu", it was observed caffeine decrease from the haploid (2n = 22) to tetraploid leaves (2n = 44). Caffeine in the tetraploid "Angustifolia" was decreased by 50% when compared to the haploid. Caffeine reduction was also observed in leaves of C. canephora var. "Kouilou" as chromosome number was increased (2n = 22 ® 2n = 44). In this case, caffeine in the leaves of the diploid genotype was close to 4 times higher than in the tetraploid. On the other hand it was observed an increase of the alkaloid when the chromosome number was doubled in the C. canephora...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Caffeine; Coffea; Leaves; Ploidy.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000300021

CONTRIBUIÇÃO AO ESTUDO ANATÔMICO DA FOLHA E  DO CAULE DO CACAUEIRO (Theobroma cacao L.)
Provedor de dados: 63
Autores: NAKAYAMA,L.H.I; SOARES,M.K.M; APPEZZATO-DA-GLÓRIA,B.
O presente estudo teve como objetivo descrever a anatomia da folha e do caule adulto enfatizando a caracterização dos tricomas e das estruturas secretoras do cacaueiro. Foram analisadas amostras de caule e folhas (limbo e pecíolo), correspondente ao 3º nó, além de folhas novas de 5cm de comprimento. A lâmina foliar é hipoestomática, com estômatos do tipo anomocítico. Em ambas as faces do limbo ocorrem quatro tipos de tricomas: sendo dois tectores e dois glandulares. Na epiderme adaxial estão presentes as glândulas secretoras de mucilagem. O mesofilo é dorsiventral; o parênquima paliçádico é formado por duas ou três camadas. O parênquima lacunoso apresenta células coletoras. Ao longo do mesofilo predomina feixes colaterais envolvidos por bainha...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cacaueiro; Anatomia; Folha; Caule; Estruturas secretoras.
Ano: 1996
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161996000100010

Developing a Soil Physical Quality Index (SPQi) for lowlands under different deployment times of no-tillage
Provedor de dados: 63
Autores: Reis,Diony Alves; Lima,Claudia Liane Rodrigues de; Bamberg,Adilson Luís.
ABSTRACT: Soil physical quality in lowlands from the Pampa biome under no-tillage (NT) plays an important role; therefore, this study aimed to establish a soil physical quality index (SPQi) from a minimum data set to detect the effects of different deployment times of NT in an Albaqualf. The comparison of areas with one (NT1), three (NT3), five (NT5) and seven (NT7) years of notillage was established using as reference a non-cultivated field plot (NC) for at least thirty years, nearby the sites under NT. Soil samples with undisturbed and disturbed structure were collected to determine the physical quality indicators and soil organic matter (SOM) fractions. The factor analysis (FA) was used to identify and select a minimum data set. The SPQi was elaborated...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Factor analysis; Minimum data set; Management systems; Lowland soils.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162019001200157

Longitudinal data assessment of global stability index in kale leaves
Provedor de dados: 63
Autores: Azevedo,Alcinei Mistico; Andrade Júnior,Valter Carvalho de; Pedrosa,Carlos Enrrik; Valadares,Nermy Ribeiro; Ferreira,Marcos Aurélio Miranda; Cecon,Paulo Roberto.
ABSTRACT Kale plants are usually sold “in natura” in street markets and malls. Kale leaves can have their appearance compromised by dehydration and discoloration due to increased post-harvest time exposure. We aimed to analyze the Global Stability Index (GSI) in kale accessions by means of repeated measurement analysis and curve grouping as a complementary form of superior sample identification with regard to post-harvest preservation. Thirty kale accessions were evaluated using a randomized block design with four blocks and five plants per plot. Two commercial leaves per plant were collected, and kept on workbenches in the shade at a temperature of 18 ± 1 °C. Subsequently, the degrees of discoloration and dehydration, total chlorophyll content, and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brassica oleracea var. acephala DC; Post-harvest preservation; Repeated measurements; Multivariate statistics; Curve grouping.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000100079

Treatment of cattle-slaughterhouse wastewater and the reuse of sludge for biodiesel production by microalgal heterotrophic bioreactors
Provedor de dados: 63
Autores: Maroneze,Mariana Manzoni; Barin,Juliano Smanioto; Menezes,Cristiano Ragagnin de; Queiroz,Maria Isabel; Zepka,Leila Queiroz; Jacob-Lopes,Eduardo.
Microalgal heterotrophic bioreactors are a potential technological development that can convert organic matter, nitrogen and phosphorus of wastewaters into a biomass suitable for energy production. The aim of this work was to evaluate the performance of microalgal heterotrophic bioreactors in the secondary treatment of cattle-slaughterhouse wastewater and the reuse of microalgal sludge for biodiesel production. The experiments were performed in a bubble column bioreactor using the microalgae Phormidium sp. Heterotrophic microalgal bioreactors removed 90 % of the chemical oxygen demand, 57 % of total nitrogen and 52 % of total phosphorus. Substantial microalgal sludge is produced in the process (substrate yield coefficient of 0.43 mg sludge mg chemical...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bioreactor; Agro-industrial wastewater; Microalgae/cyanobacteria.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162014000600011

Cold storage of 'Tahiti' lime treated with 1-methylcyclopropene
Provedor de dados: 63
Autores: Jomori,Maria Luiza Lye; Kluge,Ricardo Alfredo; Jacomino,Angelo Pedro.
The storage of 'Tahiti' limes under low temperatures enables the extension of the commercialization period. However the loss of the skin green color and the occurrence of chilling injuries prevent such advantage. The purpose of this work was to verify the efficiency of 1-methylcyclopropene (1-MCP), an inhibition of ethylene action, during the cold storage of 'Tahiti' lime. Fruits were treated for 12 hours with 1-methylcyclopropene at concentrations of 0 or 1.0 mL L-1 and then were stored at 5 or 10ºC for 30, 60 and 90 days of storage (+ 3 days of simulated marketing at 20ºC). Application of 1-MCP conserved the color of stored fruits at 10ºC during 30 days. Fruits treated with 1-MCP and stored at 5ºC presented less respiration than non-treated fruits. High...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Citrus latifolia; Chilling injury; Ethanol; Acetaldehyde.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000400027

Molecular characterization of Paecilomyces fumosoroseus (Deuteromycotina: Hyphomycetes) isolates
Provedor de dados: 63
Autores: Azevedo,Andréia Cristiane Souza; Furlaneto,Márcia Cristina; Sosa-Gómez,Daniel Ricardo; Fungaro,Maria Helena Pelegrinelli.
ITS and RAPD analyses were used to investigate molecular variations within samples of Paecilomyces isolates and to resolve five morphologically atypical isolates resembling P. fumosorosus, obtained from whitefly in Northern Paraná State. The ITS4-ITS5 amplicon was 700 base pairs (bp) long in all isolates. The five isolates of Paecilomyces not assigned to species produced restriction profiles identical to all the reference strains of P. fumosoroseus. The extent of fingerprint variability observed by RAPD was sufficient to discriminate all the isolates. The genetic similarity among unidentified isolates and strains of P. fumosoroseus was even higher than that observed among reference strains of this species, allowing us to conclude that isolates CNPso-P77,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Paecilomyces fumosoroseus; Bemisia; RAPD; Biological control; Entomopathogenic fungus.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000400021

Efeito de diferentes materiais no pH do solo
Provedor de dados: 63
Autores: Veloso,C.A.C.; Borges,A.L.; Muniz,A.S.; Veigas,I.A. de J.M.
A grande maioria dos solos agrícolas brasileiros apresenta alta acidez (pH H2O &lt; 5,5) sendo um dos principais responsáveis pela baixa produtividade das culturas. Estes solos exigem a aplicação de corretivos para elevar o seu pH, neutralizar os efeitos dos elementos tóxicos, fornecer Ca e Mg como nutrientes e aumentar a produtividade das culturas. Com o objetivo de verificar o efeito de diferentes materiais (calcário calcinado e dolomítico, escória e gesso) no pH do solo, em função da dose aplicada (2, 4 e 6 t/ha) e do tempo de incubação (25, 50 e 75 dias), foi conduzido trabalho em condições de laboratório. Após o período de incubação e determinação do pH em água, concluiu-se que: a) todos os materiais, com exeção do gesso, foram eficientes para elevar...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Calcário calcinado; Dolomítico; Escória; Gesso; PH.
Ano: 1992
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161992000400016

Selected research opportunities in soil physics
Provedor de dados: 63
Autores: Nielsen,D.R.; Kutilek,M.; Wendroth,O.; Hopmans,J.W.
Selected research opportunities are discussed in order to guide soil science research, with emphasis on soil physics, with the aim of improving agricultural productivity and environmental quality.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Research; Soil science; Soil physics.
Ano: 1997
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161997000300010

Free proline accumulation in sugarcane under water restriction and spittlebug infestation
Provedor de dados: 63
Autores: Guimarães,Eduardo Rossini; Mutton,Miguel Angelo; Mutton,Márcia Justino Rossini; Ferro,Maria Inês Tiraboschi; Ravaneli,Gisele Cristina; Silva,Jorge Alberto da.
Mahanarva fimbriolata (Stål) (Hemiptera: Cercopidae) has become a key pest in the sugarcane (Saccharum officinarum) fields of center-south Brazil. Although some control technologies have shown to be efficient, the damage promoted by this spittlebug species and its interaction with sugarcane are poorly characterized. At high infestation levels the symptoms are similar to those of severe water restriction. This work was conducted to determine whether the stress promoted by spittlebug infestation can be measured in terms of free proline accumulation. The water restriction tolerance of two sugarcane genotypes was also compared. Two experiments were set up in a greenhouse and arranged in a completely randomized design in a 2 x 2 x 4 factorial, with two...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mahanarva fimbriolata; Saccharum spp.; Proline accumulation; Water deficit.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000600009

Thermolysed and active yeast to reduce the toxicity of aflatoxin
Provedor de dados: 63
Autores: Baptista,Antonio Sampaio; Horii,Jorge; Calori-Domingues,Maria Antonia; Glória,Eduardo Micotti da; Salgado,Jocelem Mastrodi; Vizioli,Mário Roberto.
Aflatoxins are hepatotoxic metabolites produced by Aspergillus flavus and A. parasiticus on a number of agricultural commodities. This research was carried out to evaluate the ability of thermolysed and active Saccharomyces cerevisiae to attenuate liver damage caused by aflatoxin. Diets were prepared containing 0 aflatoxin; 400 mug kg-1 aflatoxin; 400 mug kg-1 aflatoxin plus 1% of dehydrated active yeast, and 400 mug kg-1 aflatoxin plus 1% of thermolysed yeast. A bioassay with Wistar rats was conducted for 28 days, and body organs were weighted and analyses of the liver tissue of the animals were performed. The relative weight of heart, kidneys and liver from animals submitted to the different treatments did not show any difference, and liver tissue of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Saccharomyces cerevisiae; Aflatoxicosis; Bioremediation; Mycotoxins; Natural contamination.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000200008

Avaliação de cultivares de berinjela em armazenamento refrigerado
Provedor de dados: 63
Autores: Kluge,Ricardo Alfredo; Antonini,Antônio Carlos Carvalho; Robles,Walter Geremias Rodriguez; Tessarioli Neto,João; Jacomino,Angelo Pedro; Scarpare Filho,João Alexio.
Frutos de diferentes cultivares de berinjela foram armazenados a 11 + 0,5ºC e 90 + 5% UR, por períodos de 7, 14 e 21 dias (+ 2 dias a 24-25ºC e 70-75% UR), com o objetivo de verificar o comportamento pós-colheita destes frutos. As cultivares estudadas foram Diamante Negro, Kiko, Piracicaba F-100, Flórida Market, Super F-100, F-2000, Suzuki, Nápoli e Ciça. Verificaram-se diferenças nas respostas das diferentes cultivares em relação à perda de peso, pressão de turgescência e qualidade global durante o armazenamento refrigerado. A frigoconservação dos frutos foi viável até 7 dias para todos as cultivares. O armazenamento por período superior a 7 dias dependeu da cultivar. A cultivar Super F-100 foi a que apresentou a maior capacidade de armazenamento (21 dias).
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Solanum melongena; Turgescência; Perda de peso; Murchamento.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000500005

Comportamento de sementes de milho híbrido durante o armazenamento sob condições variáveis de temperatura e umidade relativa do ar
Provedor de dados: 63
Autores: Bilia,D.A.C.; Fancelli,A.L.; Marcos Filho,J.; Machado,J.A.
Com o objetivo de avaliar o comportamento de sementes de milho híbrido durante o armazenamento sob condições diversas de temperatura e umidade relativa do ar foram utilizadas sementes do híbrido Pioneer 3072 e 3210, as quais foram armazenadas sob três condições distintas: câmara seca, câmara fria e condição ambiente, durante 6 meses, e avaliadas quanto à qualidade fisiológica em 3 épocas bimestrais distintas, sendo parte submetida à estresse adicional no momento de realização dos testes. Para detecção da diferença de comportamento dos materiais estudados foram empregados os testes de germinação, primeira contagem de germinação, envelhecimento acelerado, frio (com ou sem solo), condutividade elétrica e emergência de plântulas em campo. Pôde-se concluir que:...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sementes; Milho; Armazenamento.
Ano: 1994
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000100022

Estudo de diversas variedades de copas sobre diferentes porta-enxertos da mangueira (Mangifera indica L.)
Provedor de dados: 63
Autores: Simão,S.; Nylander,O.; Ottasi,B.; Barbin,D.
O objetivo deste trabalho foi verificar a interferência copa x porta-enxerto no desenvolvimento da mangueira. As alturas e os diâmetros das copas foram tomadas uma vez em 1981, quando as 210 plantas atingiram 15 anos de idade. As variedades de copas estudadas foram as seguintes: Extrema, Oliveira Neto, Carlota, Imperial, Pahiri e Bourbon. Os porta-enxertos utilizados foram Espada, Extrema, Olivara Neto, Carlota, Coco, Pahiri e Bourbon. Os dados foram analisados e a comparação das médias foi feita através do teste de Tukey em nível de 5% de probabilidade. O estudo mostrou que as variedades de copa, Olivara Neto, Extrema e Bourbon atingiram uma altura e um diâmetro maior que as demais variedades.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Manga; Porta-enxerto.
Ano: 1994
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000300023

Process-based simple model for simulating sugarcane growth and production
Provedor de dados: 63
Autores: Marin,Fábio R.; Jones,James W.
Dynamic simulation models can increase research efficiency and improve risk management of agriculture. Crop models are still little used for sugarcane (Saccharum spp.) because the lack of understanding of their capabilities and limitations, lack of experience in calibrating them, difficulties in evaluating and using models, and a general lack of model credibility. This paper describes the biophysics and shows a statistical evaluation of a simple sugarcane processbased model coupled with a routine for model calibration. Classical crop model approaches were used as a framework for this model, and fitted algorithms for simulating sucrose accumulation and leaf development driven by a source-sink approach were proposed. The model was evaluated using data from...
Tipo: Info:eu-repo/semantics/article
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162014000100001

Produção e morfologia do capim de Rhodes em seis maturidades
Provedor de dados: 63
Autores: Tamassia,Luis Fernando Monteiro; Haddad,Cláudio Maluf; Castro,Flávio Geraldo Ferreira; Vendramini,João Maurício Bueno; Domingues,José Luiz.
O manejo adotado para as gramíneas forrageiras afeta sua morfologia, traduzida em porcentagem de folhas, hastes e material morto assim como sua produção de matéria seca. O objetivo do presente trabalho foi avaliar a produção e a estrutura morfológica (porcentagem de folhas, hastes, material morto) e a relação folha:haste do capim de Rhodes (Chloris gayana Kunth.) durante seu crescimento. O experimento foi desenvolvido em uma pastagem, na cidade de Piracicaba e o delineamento experimental foi de blocos completos casualizados (quatro blocos), com seis cortes (tratamentos) a cada 10 dias, sendo o primeiro 20 dias após o corte de rebaixamento. Foram observados aumento da produção de matéria seca com o decorrer do período experimental, aumentos na altura do...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Chloris gayana; Relação folha-haste; Desenvolvimento vegetal; Morfologia; Maturidade.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000300024

Genetic diversity in common bean accessions evaluated by means of morpho-agronomical and RAPD data
Provedor de dados: 63
Autores: Chiorato,Alisson Fernando; Carbonell,Sérgio Augusto Morais; Benchimol,Luciana Lasry; Chiavegato,Marilia Barbosa; Dias,Luiz Antonio dos Santos; Colombo,Carlos Augusto.
Germplasm banks store genotype samples, improved varieties, landraces and wild species, all generically denominated accessions. The importance of characterizing germplasm banks is based on the identification and knowledge of relevant traits for genetic improvement and ex situ germplasm conservation. Thus, the present study had as aim the evaluation of the genetic diversity among 220 accessions of a Brazilian common bean germplasm bank of the "Instituto Agronômico de Campinas" (IAC) by means of 23 morpho-agronomical descriptors and 19 RAPD loci. These accessions correspond to genotypes from the Andean and Middle American gene pool as well as from cultivars derived from common bean improvement programs. The Middle American accessions and the improved...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phaseolus vulgaris; Germplasm bank; Botanical descriptors; Multivariate analyses.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000300007

Aroma composition of Tempranillo grapes as affected by iron deficiency chlorosis and vine water status
Provedor de dados: 63
Autores: Sánchez,Ramón; García,María-Rosa González; Vilanova,Mar; Rodríguez-Nogales,José-Manuel; Martín,Pedro.
ABSTRACT: Water deficit and iron nutritional deficiency (iron chlorosis) are frequent environmental stresses affecting grapevine production in the Mediterranean region. The objectives of this work were (i) to study the combined effects of both stresses on aromatic profile of Tempranillo grapes, occurring simultaneously in the vineyard, and (ii) to evaluate the viability of foliar chlorophyll content at veraison (Chl) to early assess aromatic quality potential of grapes in those conditions. Twenty non-irrigated vineyard subzones (10 m × 10 m each), affected and non-affected by iron chlorosis, were monitored in Ribera del Duero Appellation of Origin (North-Central Spain) during two consecutive seasons. Factorial ANOVA was performed to study the effects of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vitis vinifera L.; Chlorophyll; Quality; Volatile composition; Water deficit.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000200601

Effect of pH on the copigmentation of anthocyanins from Cabernet Sauvignon grape extracts with organic acids
Provedor de dados: 63
Autores: Gauche,Cony; Malagoli,Elisa da Silva; Bordignon Luiz,Marilde Terezinha.
Anthocyanins show low-stability when exposed to different food processing conditions. Copigmentation is one of the main reactions contributing to the in vivo color responsible to the stability of anthocyanins. In the aim of holding the red color, copigmentation effect of organic acids (caffeic, ferulic, gallic and tannic acids) combined with anthocyanins in crude Cabernet Sauvignon (Vitis vinifera L.) grape skin extract at pH values (1.0, 2.0, 3.0, 3.3, 3.5, 3.7, 4.0, 4.5) was evaluated in this research. The maximum copigmentation effect, revealed by the hyperchromic and bathochromic shifts in anthocyanin maximum absorbance wavelength, was obtained at pH 3.3 with every acid used. Anthocyanin stability was followed by measuring the loss of color, thus it...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Stability; Pigment; Color retention; Half-life time.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000100006

Daily rainfall variability at a local scale (1,000 ha), in Piracicaba, SP, Brazil, and its implications on soil water recharge
Provedor de dados: 63
Autores: Reichardt,K.; Angelocci,L.R.; Bacchi,O.O.S.; Pilotto,J.E.
Daily rainfall variability at a local scale (1,000 ha) was studied at Piracicaba, SP, Brazil, for the period of one year (1993-1994), in order to better understand the process of soil water recharge. Coefficients of variation of daily data for ten observation points varied from 2.2 to 169.3% and the variability was independent of rain type, i.e. whether convective, frontal or of other origin. Data were not related to separation distances between observation points and it is concluded that one observation point does not represent areas as far as 1,000 to 2,500 m apart, for daily, monthly or even quarterly averages. Yearly totals for the ten observation points presented a coefficient of variation as low as 3.06%, indicating that all points can replace each...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Variability; Rainfall; Soil water recharge.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000100008

Teores de Na, K, Mg e Ca em porta-enxertos de videira em solução salina
Provedor de dados: 63
Autores: Viana,Alexandre Pio; Bruckner,Claudio Horst; Prieto Martinez,Herminia Emilia; Martinez y Huaman,Carlos Alberto; Mosquim,Paulo Roberto.
Com o objetivo de avaliar a tolerância de porta-enxertos de videira à condições de salinidade, realizou-se um ensaio, em casa de vegetação, com cinco cultivares de porta-enxertos ('IAC 766 Campinas', 'IAC 313 Tropical', 'IAC 572 Jales', '420-A' e 'Ripária do Traviú'), cultivadas em solução nutritiva, com cinco níveis de NaCl (0, 5, 10, 15 e 20 mmol L-1). Foram determinados os teores de sódio, potássio, magnésio e cálcio no material vegetal. Os cultivares apresentaram padrões diferenciados, no tocante às concentrações dos nutrientes, nos diversos órgãos analisados (raiz, caule, folhas superiores e inferiores). As mais sensíveis, como a '420-A' e 'IAC 313', alocaram grande quantidade de Na nas folhas e apresentaram restrições na absorção de K, Mg e Ca, em...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Videira; Porta-enxertos; Salinidade; Tolerância; Nutrientes.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000100028

Biology of Anticarsia gemmatalis on soybean genotypes with different degrees of resistance to insects
Provedor de dados: 63
Autores: Fugi,Cristina Gomes Quevedo; Lourenção,André Luiz; Parra,José Roberto Postali.
A knowledge of the mechanisms of resistance present in genetic materials should help breeding programs in developing cultivars resistant to insects. The biology of Anticarsia gemmatalis Hübner (Lepidoptera: Noctuidae) was studied on leaves of four soybean genotypes with different degrees of resistance to insects. The genotypes evaluated were cultivars IAC 17 and IAC 24, resistant to defoliators and stink bugs, line PI 229358, a source of multiple resistance to insects and used as parent in various lines selected for resistance to A. gemmatalis, and 'IAC PL-1', the susceptible control. The experiments were carried out in the laboratory, under controlled conditions of temperature (25 ± 2ºC), relative humidity (60 ± 10%) and photoperiod (14h). First instar...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycine max; Velvetbean caterpillar; Host plant resistance.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000100006

Testes de capacidade de expansão em programas de melhoramento de milho pipoca
Provedor de dados: 63
Autores: Matta,Frederico de Pina; Viana,José Marcelo Soriano.
No desenvolvimento de populações melhoradas de milho pipoca é fundamental selecionar com base em qualidade, normalmente expressa pela relação volume de pipoca/peso de grãos, denominada capacidade de expansão (CE). Na seleção de indivíduos e progênies diversos sistemas de avaliação de qualidade devem ser considerados, por serem utilizados pelos consumidores. O propósito deste trabalho foi avaliar dois sistemas de determinação de CE em programas de melhoramento, sendo o primeiro uma pipoqueira de ar quente e o segundo um forno de microondas. Para avaliar a pipoqueira de ar quente foi instalado um experimento no delineamento inteiramente casualizado, envolvendo três tratamentos e nove níveis de peso de grãos, com cinco repetições. Para o microondas, buscando...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Pipocadoras; Avaliação de qualidade.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000400029

Conversion of cerrado into agricultural land in the south-western Amazon: carbon stocks and soil fertility
Provedor de dados: 63
Autores: Carvalho,João Luís Nunes; Carlos Eduardo Pelegrino,Cerri; Feigl,Brigitte Josefine; Píccolo,Marisa de Cássia; Godinho,Vicente de Paula; Herpin,Uwe; Cerri,Carlos Clemente.
Land use change and land management practices can modify soil carbon (C) dynamics and soil fertility. This study evaluated the effect of tillage systems (no-tillage - NT and conventional tillage - CT) on soil C and nutrient stocks in an Oxisol from an Amazonian cerrado following land use change. The study also identified relationships between these stocks and other soil attributes. Carbon, P, K, Ca and Mg stocks, adjusted to the equivalent soil mass in the cerrado (CE), were higher under NT. After adoption of all but one of the NT treatments, C stocks were higher than they were in the other areas we considered. Correlations between C and nutrient stocks showed positive correlations with Ca and Mg under NT due to continuous liming, higher crop residue...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Oxisol; No-tillage; Conventional tillage; Nutrient stock.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000200013

Energy potential of sugar cane biomass in Brazil
Provedor de dados: 63
Autores: Rípoli,Tomaz Caetano Cannavam; Molina Jr.,Walter Francisco; Rípoli,Marco Lorenzzo Cunali.
Brazil is a developing tropical country with abundant biomass resources. Sugar cane (Saccahrum spp.) is primarily produced to obtain sugar and alcohol. Presently sugar cane is burned before harvest. If the cane were not burned before harvest, the trash (tops and leaves) could be collected and burned to produce steam to generate electricity, or be converted into alcohol fuel and decrease the severe air pollution problems caused by sugar cane burning. Based upon logical assumptions and appropriate data, we estimate the number of people that could be served each year by this biomass if its energy was converted into electricity. From trash and bagasse, 7.0x10(6) and 5.5x10(6) people y-1 could be served, respectively.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sugar cane; Biomass; Energy.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000400013

QUALIDADE DE CRISÂNTEMOS (Dendranthema grandiflora TZVELEV) PRODUZIDOS EM DIFERENTES REGIÕES DO ESTADO DE SÃO PAULO: GRUPO POLARIS
Provedor de dados: 63
Autores: Silveira,Rosiris Bergemann de Aguiar; Minami,Keigo.
Escolheu-se o crisântemo, por ser a principal flor de corte comercializada no Estado de São Paulo, para iniciar um processo de melhoria de qualidade com conseqüente padronização para a floricultura brasileira, tanto para a produção de consumo interno quanto para aquela destinada à exportação. Através da avaliação da qualidade de inflorescências de crisântemos do grupo Polaris produzidos em diferentes regiões, e comparação com os padrões existentes, pretendeu-se chegar a um padrão nacional para crisântemos de corte. Os parâmetros analisados foram: comprimento de haste; peso da matéria fresca da haste floral; número de inflorescências abertas e por abrir; localização e número de ramificações; rigidez de haste; defeitos de formação; presença de resíduos...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Crisântemos; Avaliação da qualidade; Dendranthema grandiflora.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000200012

Accelerated aging and seedling field emergence in soybean
Provedor de dados: 63
Autores: Torres,Reynaldo Melo; Vieira,Roberval Daiton; Panobianco,Maristela.
Information regarding the relationship between laboratory seed vigor testing and seedling field emergence is very important to estimate seed performance after sowing and help producers adopt the best procedures to improve stand establishment. The objective of the present study was to relate accelerated aging (AA) test results to soybean [Glycine max (L.) Merrill] seedling field emergence results based on data obtained over three agricultural years. The following evaluations were made: seed water content, standard germination, accelerated aging, electrical conductivity, and seedling field emergence. There was a close association between planting environmental conditions, seed physiological quality and seedling field emergence. The most accurate predictions...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycine max (L.) Merrill; Seeds; Vigor.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000500002

Are camouflaged seeds less attacked by wild birds?
Provedor de dados: 63
Autores: Almeida,Alexandre de; Couto,Hilton Thadeu Zarate do; Almeida,Álvaro Fernando de.
Wheat, corn and rice crops in Brazil use seeds treated with systemic insecticide/nematicide carbofuran, mixed to rhodamine B red dye. Carbofuran is toxic and rhodamine B is attractive to wild birds that eat up these seeds, resulting in notable mortality during planting. A field experiment was performed in southeast Brazil to evaluate if camouflaged seeds would be less consumed by wild birds in comparison to commercial seeds with red-colored rhodamine B and aposematic blue seeds. Camouflaged seeds were less removed than seeds with rhodamine B and natural colors. The camouflaging was more effective in the presence of irregularities and litter. There was no removal of blue-colored seeds. As legislation requires treated seeds to receive a different color to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Seed camouflage; Carbofuran; Rhodamine B; Visual repellents; Bird mortality.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000200007

Load cell adoption in an electronic drag force flowmeter
Provedor de dados: 63
Autores: Camargo,Antonio Pires de; Botrel,Tarlei Arriel; Vieira,Ricardo Godoi; Pinto,Marinaldo Ferreira; Vellame,Lucas Melo.
This research introduces the development of an electronic flowmeter based on the drag force that a body experiences when immersed in a fluid stream. Its main goal was the development of an Electronic Drag Force Flowmeter (EDFF) using a load cell, as well as the evaluation of its performance parameters. The developed flowmeter should not require specialized labor, equipments, computers or any sophisticated and complex method, providing an easy and accurate way of flow estimation. This research was carried out in the following stages: (i) EDFF mechanical structure development; (ii) data acquisition system and embedded software design; and (iii) evaluation of EDFF performance parameters. EDFF has routines for instantaneous flow rate measurement, interactive...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Technology innovation; Flow measurement; Electronics on agriculture.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000300002

Sward structure of marandu palisadegrass subjected to continuous stocking and nitrogen-induced rhythms of growth
Provedor de dados: 63
Autores: Pereira,Lilian Elgalise Techio; Paiva,Adenilson José; Silva,Sila Carneiro da; Caminha,Fábio Olegário; Guarda,Vitor Del'Álamo; Pereira,Priscila de Mesquita.
Acceleration of the growth rhythm of plants using nitrogen fertiliser alters the rates of physiological processes like growth and senescence and may cause significant changes in sward structure, interfering with plant and animal responses. The objective of this experiment was to evaluate sward structure of marandu palisadegrass (Brachiaria brizantha) maintained at 30 cm under continuous stocking and subjected to contrasting rhythms of growth from January 2007 to April 2008. These were generated using or not nitrogen fertiliser, and comprised four experimental treatments as follows: control (non-fertilised), 150, 300 and 450 kg ha-1 of N. Acceleration of the growth rhythm of plants was associated with increases in leaf and stem bulk density, and resulted in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Herbage bulk density; Morphological composition; Grazing management; Nitrogen.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000500006

Efeito do tratamento com fontes de zinco e boro na germinação e vigor de sementes de milho
Provedor de dados: 63
Autores: Ribeiro,N.D.; Santos,O.S. dos; Menezes,N.L. de.
Foi conduzido um experimento no Departamento de Fitotecnia da Universidade Federal de Santa Maria, RS, no período de março a novembro de 1992, com o objetivo de verificar o efeito da aplicação de fontes de zinco e boro em sementes de milho tratadas ou não com defensivos agrícolas. Adotou-se o esquema fatorial 3x2x6, em delineamento inteiramente casualizado, com quatro repetições. Os tratamentos constaram de avaliações em três épocas (logo após o tratamento, quatro e oito meses depois), utilização de sementes de milho com e sem tratamento fítossanitário, combinados com seis fontes de zinco e boro (testemunha, Zn-Biocrop, B-Biocrop, E-Orgânico, Zn-Biocrop + B-Biocrop e Zn-Biocrop + B-Orgânico), nas doses únicas de 2,50g Zn e de 0,15g B/kg de sementes. Os...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Milho; Zinco; Boro; Germinação; Vigor.
Ano: 1994
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000300017

Potencial de extratos de resíduos vegetais na mobilização do calcário no solo por método biológico
Provedor de dados: 63
Autores: Franchini,Júlio Cezar; Meda,Anderson Rotter; Cassiolato,Marcelo Elias; Miyazawa,Mário; Pavan,Marcos Antonio.
O calcário aplicado na superfície do solo apresenta baixa eficiência na correção da acidez subsuperficial. A eficiência pode ser melhorada através de compostos orgânicos hidrossolúveis liberados pelos resíduos vegetais. Foi avaliado um método biológico para testar a capacidade de extratos vegetais na mobilização do calcário no solo. O método consiste das seguintes etapas: coleta e preparo do material vegetal; extração dos compostos orgânicos hidrossolúveis; preparo da coluna de solo; aplicação do calcário na superfície do solo; aplicação do extrato vegetal; irrigação com água destilada; teste biológico com a planta indicadora de trigo cv. Anahuac e avaliação do crescimento radicular. A calagem sem resíduo vegetal aumentou o pH e o teor de Ca e diminuiu o...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Calagem; Acidez subsuperficial; Teste biológico; Lixiviação.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000200020

Winery distillery waste compost effect on the performance of melon crop under field conditions
Provedor de dados: 63
Autores: Villena,Raquel; Castellanos,María Teresa; Cartagena,María Carmen; Ribas,Francisco; Arce,Augusto; Cabello,María Jesús; Requejo,María Isabel.
ABSTRACT: The substantial generation of organic waste together with increasing interest in developing sustainable agriculture heralds an opportunity for mobilizing the recycling of these materials as a source of organic matter and nutrients into a viable management strategy option. A field experiment was conducted to evaluate the use of compost derived from waste produced by the winery and distillery industries in a drip-irrigated melon crop traditionally grown in the area where these wastes are generated. A randomized complete block design was used with four treatments consisting of three different dose levels of compost: 7 (D1), 13 (D2) and 20 (D3) t ha−1 and a control (D0) without the application of compost. The effects of these treatments on plant...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cucumis melo; Growth; Yield; Nitrogen; Phosphorus.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162018000600494

Combined use of ionophore and virginiamycin for finishing Nellore steers fed high concentrate diets
Provedor de dados: 63
Autores: Nuñez,Amoracyr José Costa; Caetano,Mariana; Berndt,Alexandre; Demarchi,João José Assumpção de Abreu; Leme,Paulo Roberto; Lanna,Dante Pazzanese Duarte.
Zebu cattle fed high concentrate diets may present inconsistent performance due to the occurrence of metabolic disorders, like acidosis. The isolated use of ionophores and virginiamycin in high grain diets can improve animal performance and reduce the incidence of such disorders, but recent studies suggested that their combination may have an additive effect. Thus, 72 Nellore steers, 389 ± 15 kg initial body weight (BW), were confined and fed for 79 days to evaluate the combination of virginiamycin and salinomycin on performance and carcass traits. Animals were allocated to a randomized complete block design by BW, in a 2 × 2 factorial arrangement of treatments, with two concentrate levels (73 and 91 %) and two virginiamycin levels (0 and 15 mg kg-1), and...
Tipo: Info:eu-repo/semantics/article
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162013000400002

Mudanças periódicas dos ingredientes alimentares associadas às diferentes formas de ração no desempenho de frangos de corte
Provedor de dados: 63
Autores: Miltenburg,G.J.M.; Silva,R.D.M.; Packer,I.U.
Efeitos da forma de ração (triturada e farelada), sexos e mudanças semanais na composição centesimal das rações no peso corporal, ganho de peso e conversão alimentar de frangos de corte no período de 1 até 49 dias de idade, foram testados através de delineamento fatorial 2 x 2 x 2, com 3 repetições de 50 aves cada. A ração basal foi formulada para conter milho moído, farelo de soja, fosfato bicálcico, calcáreo, gordura animal, sal e suplemento de vitaminas, minerais e aditivos. As mudanças na composição foram feitas pela redução do nível de farelo de soja e calcáreo, retirada da gordura animal e introdução de protenose, farelo de algodão e farinha de carne e ossos. As rações foram formuladas para serem isocalóricas e isoprotéicas. Os resultados indicaram...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Formas de ração; Frangos de corte.
Ano: 1993
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161993000300026

A prática pedagógica do professor de Engenharia Agronômica
Provedor de dados: 63
Autores: Tullio,A. A.
Esta pesquisa procurou identificar a prática pedagógica do professor de Engenharia Agronômica, quais as concepções do processo de aprendizagem e em que medida o conceito teórico do professor é coerente com a sua prática. A prática pedagógica foi aqui delimitada como sendo o cotidiano do professor na execução de seu ensino. O público alvo foram os docentes e discentes do Curso de Engenharia Agronômica da Escola Superior de Agricultura "Luiz de Queiroz"- Campus de Piracicaba da USP. O método expositivo foi predominante, apoiado no uso do quadro negro e retroprojetor. O professor nesse método é a figura central do processo ensino-aprendizagem. A freqüência bastante acentuada em Congressos tem trazido uma atualização constante em termos de conteúdo.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Agronomia; Ensino; Pedagogia.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000300029

Minjingu phosphate rock availability in low-pH highly weathered soil as affected by added salts
Provedor de dados: 63
Autores: Savini,Isaac; Koala,Saidou; Kihara,Job.
Concentrations and identity of ions in the soil solution may affect soil phosphorus (P) reactions and P availability. In this study, the magnitude of these reactions was evaluated following the application of Minjingu phosphate rock (MPR) combined with chloride and carbonate salts of Na and Ca within an incubation experiment. Twenty-one days later NaOH-P and HCl-P were determined. This investigation was undertaken with the aim of identifying the role of Ca-ion activity in the liquid phase on the solubilization of MPR and formation of insoluble Ca-P phases. The increase in pH was higher with Na2CO3 than with CaCO3, while both CaCl2 and NaCl resulted in slight decreases in pH. The dissolution of MPR was higher overall when MPR was applied singularly than for...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phosphorus; Anion; Cation; Calcium.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162015000500440

Reaction of dwarf cashew clones to Colletotrichum gloeosporioides isolates in controlled environment
Provedor de dados: 63
Autores: López,Ana Maria Queijeiro; Lucas,John Alexander.
The cashew (Anacardium occidentale L.) crop is an important source of income for the population of the Brazilian Northeast, and anthracnose disease caused by Colletotrichum gloeosporioides leads to significant production loss. However, there is little information on either the host resistance or the variation in the aggressiveness of the pathogen under controlled environment. The reaction of commercial (CCP-06, CCP-09, CCP-76 and CCP-1001) and one non-commercial (CAP-14) dwarf cashew clones was assessed against 36 isolates of this fungus controlled environmental conditions. All the isolates, including those from hosts other than cashew, were able to cause lesions on leaves and stems of most clones, albeit to different degrees. Clone CCP-06 was the most...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anacardium occidentale; Anthracnose; Resistance; Aggressiveness.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000200016

A leaf bud technique for rapid propagation of cassava (Manihot esculenta Crantz)
Provedor de dados: 63
Autores: Neves,Reizaluamar de Jesus; Souza,Leonardo Silva; Oliveira,Eder Jorge de.
ABSTRACT The slow rate of multiplication is one of the main constraints on the production of cassava (Manihot esculenta Crantz). This work aimed to evaluate the use of leaf buds for rapid propagation of cassava varieties. Leaf buds were excised from three cassava varieties (BRS Kiriris, 98150-06 and 9624-09) for plantlet generation. The experiment was completely randomized with a 5 (age of mother plant) × 3 (position of the leaf buds on the stems) × 2 (agrochemical treatments) factorial design. Data were collected on leaf sprouting percentage (Spro.Per), plantlet height (Plant.Hei) and total dry mass of plantlets (Dry.Mass.Plant). There was a difference between the three traits for most of the varieties, demonstrating significant effects on the agronomic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sprouting; Cuttings; Alternative multiplication; Asexual propagation.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000200600

Metodologia alternativa do teste de envelhecimento acelerado para sementes de cenoura
Provedor de dados: 63
Autores: Rodo,Angelica Brod; Panobianco,Maristela; Marcos Filho,Júlio.
O presente trabalho teve por objetivo estudar a metodologia do teste de envelhecimento acelerado para avaliação do potencial fisiológico de sementes de cenoura, bem como avaliar a eficiência do uso de solução saturada de sal no controle da absorção de água pelas sementes durante a realização do teste. Para tanto, quatro lotes de sementes de cenoura, cultivar Brasília, foram submetidos aos testes de germinação, emergência das plântulas em casa de vegetação, condutividade elétrica e envelhecimento acelerado (41°C; 48, 72 e 96h; com e sem o uso de solução saturada de NaCl). O teste de envelhecimento acelerado (com e sem sal) permitiu classificar os lotes em diferentes níveis de vigor, de maneira semelhante ao do teste de emergência das plântulas. Diante dos...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Daucus carota; Vigor; Potencial fisiológico; Germinação.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000200015

Development of an SSR-based identification key for Tunisian local almonds
Provedor de dados: 63
Autores: Gouta,Hassouna; Ksia,Elhem; Buhner-Zaharieva,Tatiana; Mliki,Ahmed; Gogorcena,Yolanda.
Ten simple sequence repeat (SSR) loci were used to study polymorphism in 54 almond genotypes. All genotypes used in this study originated from almond-growing areas in Tunisia with different climatic conditions ranging from the sub-humid to the arid and are preserved in the national collection at Sidi Bouzid. Using ten SSR, 130 alleles and 250 genotypes were revealed. In order to develop an identification key for each accession, the data were analysed separately for each microsatellite marker. The most polymorphic microsatellite (CPDCT042) was used as a first marker. Two microsatellite loci (CPDCT042 and CPDCT025) were sufficient to discriminate among all accessions studied. Neighbour-joining clustering and principal coordinate analysis were performed to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Prunus dulcis Mill; Genetic diversity; Genetic resources; Microsatellites; Molecular characterization.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162012000200004

Performance of dihaploid wheat lines obtained via anther culture
Provedor de dados: 63
Autores: Salomon,Marcus Vinicius; Camargo,Carlos Eduardo de Oliveira; Petinelli Jr.,Armando; Azevedo Filho,Joaquim Adelino de.
The anther culture technique has been used in breeding programs to obtain haploid plants from hybrid plants of F1 generation and to develop more efficiently wheat cultivars. To study the behavior of dihaploid wheat lines and two check cultivars, IAC-24 and IAC-289, experiments were carried out under sprinkler irrigation at Monte Alegre do Sul, SP, Brazil, in an Haplic Acrisol and at Tatuí, SP, Brazil, in a Rhodic Ferrasol, during the years 1999 and 2000. Genotypes were evaluated for grain yield, 100 grain weight, plant height, resistance to leaf rust (Puccinia recondita f. sp. tritici Rob. Desm.) and lodging. The genotypes were also evaluated under laboratory conditions for their Al+3 toxicity tolerance using nutrient solutions. The line 8, originated from...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Grain yield; 100 grain weight; Plant height; Lodging; Tolerance to aluminum.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000100007

Leaf traits and gas exchange in saplings of native tree species in the Central Amazon
Provedor de dados: 63
Autores: Mendes,Keila Rego; Marenco,Ricardo Antonio.
Global climate models predict changes on the length of the dry season in the Amazon which may affect tree physiology. The aims of this work were to determine the effect of the rainfall regime and fraction of sky visible (FSV) at the forest understory on leaf traits and gas exchange of ten rainforest tree species in the Central Amazon, Brazil. We also examined the relationship between specific leaf area (SLA), leaf thickness (LT), and leaf nitrogen content on photosynthetic parameters. Data were collected in January (rainy season) and August (dry season) of 2008. A diurnal pattern was observed for light saturated photosynthesis (Amax) and stomatal conductance (g s), and irrespective of species, Amax was lower in the dry season. However, no effect of the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Diurnal variation; Forest understory; Photosynthetic capacity; Rainfall seasonality.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000600002

Rhizosphere pH and phosphorus forms in an Oxisol cultivated with soybean, brachiaria grass, millet and sorghum
Provedor de dados: 63
Autores: Schoninger,Evandro Luiz; Gatiboni,Luciano Colpo; Ernani,Paulo Roberto.
Plants have shown different responses to fertilization with rock phosphate, including responses through alteration of the attributes of rhizospheric soil. The objective of this study was to evaluate soil pH alterations and alterations in the contents of forms of phosphorus in the rhizosphere of soil fertilized with rock phosphate as a result of cultivation of species of plants. An experiment was developed under greenhouse conditions to evaluate alterations in the pH and in the forms of phosphorus in the rhizosphere of an Oxisol fertilized with rock phosphate and cultivated with four species. Treatments consisted of the cultivation of four species of soybean - Glycine max (L.) Merrill, brachiaria grass - Brachiaria brizantha Hochst Stapf, millet -...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brazilian savanna soils; Phosphorus fractionation; Cover plants; Rock phosphate; Rhizospheric soil.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162012000400004

New insights into genomic selection through population-based non-parametric prediction methods
Provedor de dados: 63
Autores: Lima,Leísa Pires; Azevedo,Camila Ferreira; Resende,Marcos Deon Vilela de; Silva,Fabyano Fonseca e; Suela,Matheus Massariol; Nascimento,Moysés; Viana,José Marcelo Soriano.
ABSTRACT: Genome-wide selection (GWS) is based on a large number of markers widely distributed throughout the genome. Genome-wide selection provides for the estimation of the effect of each molecular marker on the phenotype, thereby allowing for the capture of all genes affecting the quantitative traits of interest. The main statistical tools applied to GWS are based on random regression or dimensionality reduction methods. In this study a new non-parametric method, called Delta-p was proposed, which was then compared to the Genomic Best Linear Unbiased Predictor (G-BLUP) method. Furthermore, a new selection index combining the genetic values obtained by the G-BLUP and Delta-p, named Delta-p/G-BLUP methods, was proposed. The efficiency of the proposed...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Genomic prediction; Selection index; Genetic gain; Asian rice.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162019001400290

avaliação da capacidade de enraizamento e desenvolvimento vegetativo de GENÓTIPOS de videira para porta-enxerto
Provedor de dados: 63
Autores: BARROS,J.C. da S.M. de; POMMER,C.V.; PASSOS,I.R. da S.; TERRA,M.M.; SABINO,J.C.; Ribeiro,I.J.A.; PIRES,E.J.P.
A expansão da viticultura e sua difusão em regiões que apresentam diversidade de condições, bem como a possível utilização de cultivares que apresentem diferentes níveis de afinidade, torna indispensável a viabilização de novos porta-enxertos que possam atender a essas finalidades. O objetivo deste trabalho foi avaliar genótipos resultantes de hibridações efetuadas no Instituto Agronômico de Campinas (IAC), quanto à possibilidade de se tornarem novos porta-enxertos para videira. O trabalho foi conduzido na Seção de Viticultura do IAC, localizada no Centro Experimental de Campinas, SP. Foram utilizados 29 genótipos resultantes de cruzamentos realizados entre 1983 e 1985, escolhidos pelo seu vigor e exuberância vegetativa. Estes genótipos foram comparados...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Videira; Porta-enxerto; Seleção; Híbridos; Cultivares.
Ano: 1996
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161996000200016

Pragas e inimigos naturais na soja e no milho cultivados em sistemas diversificados
Provedor de dados: 63
Autores: Cividanes,Francisco Jorge; Yamamoto,Fábio Takeshi.
A consorciação de culturas e o plantio direto podem influenciar a dinâmica populacional de insetos, aumentando ou diminuindo a densidade populacional de pragas e de inimigos naturais. Deste modo, avaliaram-se os efeitos de sistemas de plantio direto e da consorciação soja [Glycine max (L.) Merrill] e milho (Zea mays L.) sobre as populações de insetos-pragas e inimigos naturais. Os tratamentos constituíram um fatorial 3x2 (monocultura de soja, monocultura de milho, consorciação soja-milho em plantio direto e plantio convencional). Os insetos foram amostrados pelo método do pano, rede entomológica e procura visual. No milho, a ocorrência de insetos-pragas da parte aérea e insetos predadores não foi influenciada pelo manejo do solo. Lagartas de Helicoverpa...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycine max; Zea mays; Dinâmica populacional de insetos; Plantio direto; Consorciação de culturas.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000400010

Perfomance of an evaporative cooling system of a finishing phase swine barn
Provedor de dados: 63
Autores: Sartor,Valmir; Baêta,Fernando da Costa; Tinôco,Ilda de Fátima Ferreira; Luz,Maira Luciana.
The thermal environment inside of a finishing phase swine barn has great influence on the success of swine production. This environment can be characterized by the black globe temperature and humidity index (BGHI), that represents the air temperature, humidity, wind speed and radiation. Due to the small number of Brazilian reports on this specific subject, this experiment was performed to verify the effect of one kind of evaporative cooling system on the thermal comfort of the animal in a swine barn, during the 98/99 summer at Patos de Minas, MG, Brazil. Two constructions were used, divided in 36 barns, each one with 15 animals, 110 to 150 days old. Along a side of one barn, four cooling devices were installed, with a ventilation system connected to a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ventilation; Thermal environment; Thermal comfort.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000100003

Spatial and temporal variability of soil electrical conductivity related to soil moisture
Provedor de dados: 63
Autores: Molin,José Paulo; Faulin,Gustavo Di Chiacchio.
Soil electrical conductivity (ECa) is a soil quality indicator associated to attributes interesting to site-specific soil management such as soil moisture and texture. Soil ECa provides information that helps guide soil management decisions, so we performed spatial evaluation of soil moisture in two experimental fields in two consecutive years and modeled its influence on soil ECa. Soil ECa, moisture and clay content were evaluated by statistical, geostatistical and regression analyses. Semivariogram models, adjusted for soil moisture, had strong spatial dependence, but the relationship between soil moisture and soil ECa was obtained only in one of the experimental fields, where soil moisture and clay content range was higher. In this same field,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Precision agriculture; Soil physics; Geostatistics; Soil sensors.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162013000100001

Electrolytic conductivity of synthetic organomineral complexes
Provedor de dados: 63
Autores: Ksiezopolska,Alicja.
The mechanism of the formation of organomineral complexes in soils is very complex and still little known. Examination of the complexes in unaltered form, as isolated from the soil, is very difficult due to the dispersing effect of all extraction agents which break the complexes up, destroying their natural properties. It is much easier to perform most of the tests on preparations of organomineral complexes obtained under laboratory conditions. This paper is concerned with model research on the formation of synthetic complexes of humic acids with minerals: Na-montmorillonite, mica, kaolinite at various pH values (3-7) and in the presence of aluminum ions. The aim of the research was to develop an optimum reaction of suspension for the synthesis of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Humic acids; Clay minerals; Aluminum oxide; Degree of complex formation.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000200007

Attraction of Neomegalotomus parvus (Westwood)(Heteroptera: alydidae) to cow urine and ammonia
Provedor de dados: 63
Autores: Silva,Jovenil José da; Arruda-Gatti,Iara Cintra de; Mikami,Adriana Yatie; Pissinati,Aline; Panizzi,Antônio Ricardo; Ventura,Mauricio Ursi.
The alydid bug parvus (Westwood) is not easily detected in the field and the discovery of attractants may be a suitable way to monitor this species. The attraction of N. parvus to traps (transparent, transparent green and yellow) baited with cow urine and ammonia was studied in two field trials. Traps were placed near a terrace with pigeon pea plants (Cajanus cajan L.). Tap water, NaCl 10% aqueous solution (w/v), cow urine, and ammonia (NH4OH 1% aqueous solution) were tested as attractants in yellow, transparent and transparent green traps. Green traps baited with cow urine caught more bugs than yellow and transparent traps (3.2 and 7.2 times more, respectively), and more bugs than traps of the same color with just water (no captures) or NH4OH solution...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Semiochemical; Attractant; Trap color.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000100012

Capacidade de dispersão deTrichogramma pretiosum riley, 1879 para controle de Helicoverpa zea (Boddie, 1850) em milho
Provedor de dados: 63
Autores: Sá,L.A. Nogueira de; Parra,J.R.P.; Silveira Neto,S.
Estudou-se, em duas localidades do Estado de São Paulo, a capacidade de dispersão de Trichogramma pretiosum Riley, 1879 na cultura do milho, em relação a ovos de Helicoverpa zea (Boddie, 1850). A dispersão de T. pretiosum, 36 horas após a liberação, foi de 80 a 102 m². Ocorreu uma relação inversa entre parasitismo e predação natural por insetos, nas duas localidades estudadas. Em função dos resultados obtidos, determinou-se que a liberação dos parasitóides, para controle de H. zea, deve ser feita em 100 pontos/ha.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Trichogramma pretiosum; Capacidade de dispersão; Milho; Helicoverpa zea; Controle biológico; Zea mays.
Ano: 1993
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161993000200009

Morphomolecular characterization of Pleurotus ostreatus (Jacq. Fr.) kummer strains in relation to luminosity and temperature of frutification
Provedor de dados: 63
Autores: Marino,Regina Helena; Eira,Augusto Ferreira da; Kuramae,Eiko Eurya; Queiroz,Elvio Cardoso.
Temperature is one of the main factors affecting mushrooms development and introduction in new areas. Effects of temperature (15ºC and 28ºC) and luminosity (120 and 900 lux) were evaluated for eight P. ostreatus strains in relation to precocity, yield, pileus area, stalk formation pattern, coloration and handling resistance. Genetic variability of strains was analysed by the Random Amplified Polymorphic DNA (RAPD) method. The Pos 98/37 strain was the only to yield white pileus at 28ºC - 900 lux, and grey ones at 15ºC and 120 lux. The Pos 96/05 strain, the latest, produced lead-coloured pileus at 15ºC, as did the remaining strains at this temperature. Strains cultivated at 15ºC did not differ in relation to handling resistance. At 28ºC mushrooms were less...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mushrooms; Temperature; Morphology of basidiocarps; Yield and marked RAPD.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000300018

Seed-borne pathogens and electrical conductivity of soybean seeds
Provedor de dados: 63
Autores: Wain-Tassi,Adriana Luiza; Santos,Juliana Faria dos; Panizzi,Rita de Cássia; Vieira,Roberval Daiton.
Adequate procedures to evaluate seed vigor are important. Regarding the electrical conductivity test (EC), the interference in the test results caused by seed-borne pathogens has not been clarified. This research was carried out to study the influence of Phomopsis sojae (Leh.) and Colletotrichum dematium (Pers. ex Fr.) Grove var. truncata (Schw.) Arx. fungi on EC results. Soybean seeds (Glycine max L.) were inoculated with those fungi using potato, agar and dextrose (PDA) medium with manitol (-1.0 MPa) and incubated for 20 h at 25 °C. The colony diameter, index of mycelial growth, seed water content, occurrence of seed-borne pathogens, physiological potential of the seeds, measured by germination and vigor tests (seed germination index, cold test,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycine max; Phomopsis sojae; Colletotrichum dematium var. truncata; Vigor.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162012000100004

Effects of light on the propagation and growth of bulbs of Hippeastrum hybridum cv. Apple Blossom (Amaryllidaceae)
Provedor de dados: 63
Autores: Stancato,G.C.; Mazzafera,P.
Commercially bulbs of Hippeastrum hybridum are propagated by twin scales, which are cultured in wet vermiculite in the darkness until bulbil appearance. We showed that twin scales kept under sun light produced bulbils, that once transferred to the field, did not undergo severe light stress. They had higher bulb dry weight and due to the presence of green leaves they grew faster when transplanted to the field than bulbils produced from scales kept in the darkness. An intermediary treatment (a period of darkness followed by transference to light) confirmed the advantages of producing bulbils under sun light conditions. It appears that in the field, growth of bulbs from dark grown bulbils was retarded due to the strong competition among leaves and roots for...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amaryllidaceae; Bulbils production; Hippeastrum hybridum; Vegetative propagation.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000200021

Enzyme activity and microbial biomass in an Oxisol amended with sewage sludge contaminated with nickel
Provedor de dados: 63
Autores: Revoredo,Marcos Donizeti; Melo,Wanderley José de.
The role of nickel in soils of tropical areas under the application of sewage sludge is still not very well known. This study was carried out under greenhouse conditions in Jaboticabal, São Paulo State, Brazil, with the objective of evaluating the impact of the application of sewage sludge previously contaminated with rates of nickel (329, 502, 746 and 1119 mg kg-1, dry basis) on a soil cropped with sorghum, in relation to soil enzyme activity and soil microbial biomass. Soil samples were collected at the beginning and the end of the experiment. The experimental design was completely randomized, with five treatments (control and four rates of Ni in the sewage sludge) and four replications. C and N of the soil microbial biomass and enzyme activities (acid...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Heavy metal; Biosolid; Acid phosphatase; Alkaline phosphatase; Sorghum.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000100009

Ocorrência de mastite bovina em fazendas produtoras de leite B no estado de São Paulo
Provedor de dados: 63
Autores: Laranja,L.F.; Machado,P.F.
Durante o período compreendido entre os meses de Março/1991 e Fevereiro /1992 foi realizado um experimento com o objetivo de avaliar a prevalência da mastite bovina em 07 fazendas produtoras de leite tipo B de diferentes regiões do estado de São Paulo. Foram analisadas 1683 vacas que deram origem a 7695 resultados do CMT e das quais foram coletadas 983 amostras de leite para realização do exame microbiológico. A análise do CMT indicou 47,0% de vacas com CMT negativo, 15,1% CMT + e 37,5% CMT ++/+ + + . Os escores do CMT foram distribuidos segundo o número de lactação (1ª lactação, 2ª lactação e 3ª ou + lactações) e segundo o estágio de lactação (1-30 dias de lactação, 31-90 dias, 91-250 dias e &gt; 250 dias). A análise dos dados demonstrou que houve um...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mastite; Prevalência; CMT; Microbiologia.
Ano: 1994
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000300033

Genetic diversity reduction in improved durum wheat cultivars of Morocco as revealed by microsatellite markers
Provedor de dados: 63
Autores: Henkrar,Fatima; El-Haddoury,Jamal; Ouabbou,Hassan; Nsarellah,Nasserlehaq; Iraqi,Driss; Bendaou,Najib; Udupa,Sripada Mahabala.
ABSTRACT It has been argued that genetic diversity in crop varieties has been on the decline in recent times due to plant breeding. This can have serious consequences for both the genetic vulnerability of crops and their plasticity when responding to changes in production environments. It is, therefore, vital for plant breeding programs to maintain sufficient diversity in the cultivars deployed for multi-period cultivation. In this study, to understand the temporal genetic diversity in durum wheat, 21 improved durum wheat cultivars released in Morocco, since 1956 and five exotic cultivars currently used in crossing programs were analyzed using 13 microsatellite markers. The analysis revealed a total of 44 alleles and average genetic diversity of 0.485 with...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Triticum turgidum L. subsp. durum; Cultivar characterization; SSR markers.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000200134

Volatilization kinetics of secondary compounds from sugarcane spirits during double distillation in rectifying still
Provedor de dados: 63
Autores: Alcarde,André Ricardo; Souza,Paula Araújo de; Belluco,André Eduardo de Souza.
The qualitative variation of secondary components plays a key role in the aroma and taste of the sugarcane spirit. The objective of this work was to study the volatilization kinetics of secondary components of sugarcane spirits during double distillation process in a rectifying still to verify the cutoff point in ethanol between "head" and "tail" fractions. Fermented sugarcane juice was distilled in rectifying still according to the methodology used for whisky production. Both distillates from first and second distillations were collected in fractions of 500 mL and analyzed for the concentrations of ethanol, copper, volatile acidity, furfural and hydroxymethylfurfural, aldehydes, esters, methanol and higher alcohols. In the first distillation, aldehydes...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Wine; Volatile compounds; Cachaça.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000300005

Composting sewage sludge with green waste from tree pruning
Provedor de dados: 63
Autores: Moretti,Sarah Mello Leite; Bertoncini,Edna Ivani; Abreu-Junior,Cassio Hamilton.
Sewage sludge (SS) has been widely used as organic fertilizer. However, its continuous use can cause imbalances in soil fertility as well as soil-water-plant system contamination. The study aimed to evaluate possible improvements in the chemical and microbiological characteristics of domestic SS, with low heavy metal contents and pathogens, through the composting process. Two composting piles were set up, based on an initial C/N ratio of 30:1, with successive layers of tree pruning waste and SS. The aeration of piles was performed by mechanical turnover when the temperature rose above 65 ºC. The piles were irrigated when the water content was less than 50 %. Composting was conducted for 120 days. Temperature, moisture content, pH, electrical conductivity...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biosolid; Compost; Pathogen; Soil fertility.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162015000500432

Model-predicted ammonia emission from two broiler houses with different rearing systems
Provedor de dados: 63
Autores: Lima,Nilsa Duarte Silva; Garcia,Rodrigo Garófallo; Nääs,Irenilza Alencar; Caldara,Fabiana Ribeiro; Ponso,Roselaine.
Ammonia (NH3) emissions from broiler production can affect human and animal health and may cause acidification and eutrophication of the surrounding environment. This study aimed to estimate ammonia emissions from broiler litter in two systems of forced ventilation, the tunnel ventilation (TV) and the dark house (DH). The experiment was carried out on eight commercial broiler houses, and the age of the birds (day, d), pH and litter temperature were recorded. Broilers were reared on built-up wood shaving litter using an average flock density of 14 bird m–2. Temperature and relative humidity inside the broiler houses were recorded in the morning during the grow-out period. A factorial experimental design was adopted, with two types of houses, four replicates...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Noxious gases; Environmental impact; Dark house; Poultry; Tunnel ventilation.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162015000500393

Sunnhemp and millet as green manure for tropical maize production
Provedor de dados: 63
Autores: Perin,Adriano; Santos,Ricardo Henrique Silva; Urquiaga,Segundo Sacramento; Cecon,Paulo Roberto; Guerra,José Guilherme Marinho; Freitas,Gilberto Bernardo de.
Commonly N release from legume residues is rapid in the tropics. Legume mixtures with grasses can result in slower nutrient release from residues, better matching the N requirements of the following crop. The objectives of this study were to evaluate the effects of the green manures sunnhemp (Crotalaria juncea) and millet (Pennisetum glaucum), alone or mixed, on the performance of a subsequent maize crop with and without the application of N-fertilizer. The experiment consisted of four randomized blocks, with split plots. The plot treatments consisted of previous cultivation of sunnhemp, millet, mixed sunnhemp+millet and weeds. The subplot treatments were 90 kg N ha-1 and absence of N-fertilizer. Substantial amounts of biological nitrogen fixation (BNF)...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: N recovery; Biological nitrogen fixation; Decomposition rate; Intercropping.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000500006

Molecular characterization of a phytoplasma associated with a commercial variety of Momordica charantia
Provedor de dados: 63
Autores: Munhoz,Elizeu Merizio; Pereira,Thays Benites Camargo; Bedendo,Ivan Paulo.
ABSTRACT: Momordica charantia (bitter melon) presents two distinct types or varieties, known as wild type and commercial type. Plants of the wild type are hosts of a phytoplasma of the group 16SrIII-J, which is associated with a disease known as witches’ broom. However, this disease has not yet been reported in commercial bitter melon. Thus, symptomatic plants of the commercial type were analyzed in order to demonstrate the association between phytoplasmas and disease. In further assays, strains found in symptomatic plants of the commercial type were subjected to analysis of sequences of the secY gene to determine the extent of genetic diversity. Amplification of DNA fragments from genes 16Sr rRNA (1.2Kb) and secY (1.6Kb) revealed association of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mollicutes; Cucurbitaceae; Bitter melon; Phloem bacteria; Yellows.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162019001300232

PROCESSOS DE GERMINAÇÃO DE ISOLADOS DO FUNGO  Zoophthora radicans SOBRE Empoasca kraemeri
Provedor de dados: 63
Autores: LEITE,L.G; ALVES,S.B; WRAIGHT,S.P; GALAINI-WRAIGHT,S; ROBERTS,D.W.
Foram analisados e comparados os processos de germinação dos isolados ARS-1590, ARS-1261 e ARS-1229 de Zoophthora radicans (Brefeld) Batko sobre ninfas do 5º ínstar de Empoasca kraemeri (Ross &amp;amp; Moore, 1957) a 20ºC e 100% de umidade relativa (RH). A germinação dos conídios primários dos isolados sobre o inseto iniciou-se dentro do período de duas horas após a inoculação. A produção total de tubos germinativos tendeu a se igualar a de capiloconídios sobre o corpo do hospedeiro, doze horas após a inoculação. A proporção de conídios secundários, dentro das formas geradas pelos conídios primários germinados sobre o inseto, não ultrapassou 25% em qualquer das regiões do corpo.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Insecta; Cigarrinha verde; Entomophthorales; Controle biológico.
Ano: 1996
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161996000100026

Avaliação do crescimento e da utilização de nutrientes pelo amendoim
Provedor de dados: 63
Autores: Feitosa,C.T.; Nogueira,S.S.S.; Gerin,M.A.N.; Rodrigues Filho,F.S.O.
Avaliaram-se os padrões de crescimento e de absorção de macro e de micronutrientes de quatro cultivares de amendoim, sendo três de lançamento recente, IAC-Oirã, lAC-Poitara e IAC-Tupã, todos de porte ereto e um mais antigo, Penápolis, de hábito rasteiro. Os resultados obtidos mostraram que os cultivares recentes apresentaram o mesmo padrão de crescimento e de acúmulo dos nutrientes e o cultivar a rasteiro, de ciclo mais longo, apresentou um padrão ligeiramente diferente. Dentre os cultivares estudados, IAC-Tupã e IAC-Oirã apresentaram certa superioridade na eficiência de aproveitamento da matéria seca total produzida e do total de nutrientes translocados para a semente, órgão alvo da cultura do amendoim.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amendoim; Cultivares; Parâmetros de crescimento; Marcha de absorção.
Ano: 1993
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161993000300015

Diversity and genetic structure of jenipapo (Genipa americana L.) Brazilian accessions
Provedor de dados: 63
Autores: Silva,Ana Veruska Cruz da; Freire,Karla Cristina Santos; Lédo,Ana da Silva; Rabbani,Allívia Rouse Carregosa.
Usually known as jenipapo, Genipa americana L. is a Rubiaceae Brazilian native species. It is an important species in the restoration of Brazilian riparian forests and is one of the most promising fruit trees for sustainable harvesting programs. In this study we provide the first data on the genetic diversity and structure of a Jenipapo Germplasm Bank using inter simple sequence repeat (ISSR) markers. We evaluated 160 accessions from wild populations, and the data generated from 12 ISSR primers were used to determine genetic variability via a model-based Bayesian procedure (Structure) and molecular variance analysis. In addition, Shannon index, genetic diversity and Jaccard coefficients were estimated. A total of 12 primers were used, which generated 123...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Tropical fruits; Molecular markers; Germplasm; Conservation.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162014000500007

Encapsulação: efeitos sobre a germinação e sanidade das sementes de algodão
Provedor de dados: 63
Autores: Arantes,Hermes Augusto Guimarães; Cícero,Silvio Moure; Novembre,Ana Dionisia da Luz Coelho.
A presença de línter sobre a superfície das sementes de algodão dificulta os processos de beneficiamento e de semeadura. A aplicação de produtos encapsulantes sobre a superfície da semente pode-se constituir em alternativa para a solução desse problema. Assim, o presente trabalho teve como objetivo estudar o efeito da utilização de diferentes produtos encapsulantes na germinação de sementes de algodão. Para tanto, foram utilizados três lotes de sementes de algodão, cv. IAC 20, safra 94/95, sendo avaliados dez tratamentos: deslintamento mecânico, deslintamento químico, deslintamento mecânico e encapsulação com gesso + bentonita, com Sepiret 4015 e com Sepiret 6182, todos com e sem a aplicação de fungicida. Foram avaliadas a germinação e a sanidade das...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gossypium hirsutum; Encapsulação; Semente; Qualidade.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000100014

Leaf nutrient contents of rangpur lime rootstock as afected by N, P, K, Ca and S fertilization
Provedor de dados: 63
Autores: Ruschel,Jonas; Carmello,Quirino Augusto de Camargo; Bernardi,Alberto Carlos de Campos; Carvalho,Sérgio Alves de; Mattos Jr.,Dirceu.
Analysis of leaf nutrient contents can demonstrate plant nutritional status, identify symptoms of deficiency and toxicity, and evaluate the need to adjust fertilization programs. This research determined N:P:K:Ca:S rates for optimal nutrition of Rangpur lime - RL (Citrus limonia Osb.) rootstock, in an experiment arranged in a fractional factorial design of the (¹/25) 5(4) type, with 25 treatments distributed within five blocks. Seedlings of RL were transplanted into 3.8-dm³ containers filled with commercial growing media, when plant height = 10 cm, in a nursery. Treatments consisted of the following nutrient rates (g per plant): N = 0.31, 0.62, 1.25, 2.5 and 5; K = 0.4, 0.62, 1.25, 2.5 and 5; P = 0.35, 1.0, 2.0, 3.0 and 4.0; and Ca = 3.5, 5.0, 6.0, 7.0 and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Citrus limonia; Mineral nutrition; Leaf analysis; Response surface.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000500007

Avaliação de genótipos de Leucaena spp. nas condições edafoclimáticas de São Carlos,SP: II. determinações bromatológicas no período de estabelecimento
Provedor de dados: 63
Autores: Primavesi,A.C.P. de A.; Nogueira,A.R.A.; Primavesi,O.; Godoy,R.; Batista,L.A.R.; Novaes,N.J.; França-Dantas,M.S.
Em experimento conduzido em Latossolo Vermelho-Amarelo distrófico, em área da EMBRAPA - CPPSE em São Carlos, situada a 22°01'S e 47°53'W, com altitude de 856 m e média de precipitação anual de 1502 mm, procedeu-se a determinação da composição bromatológicade folhas, hastes com diâmetro menor que 6 mm e vagens, de genótipos de leucena. Os genótipos avaliados, foram: L.leucocephala cv. Texas 1074 (TI), L.leucocephala 29 A9 (T2), L.leucocephala 11 x L.dlversifolia 25 (T3), L.leucocephala 11 x L.diversifolia 26 (T4), L.leucocephala 24-19/2-39 x L.diverstfolia 26 (T5) e L.leucocephala c v. Cunningham (testemunha). Verificou-se que: os genótipos avahados não apresentaram diferenças nas determinações bromatológicas, realizadas nas folhas e talos finos; o genótipo...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Leucaena spp.; Avaliação de genótipos; Determinações bromatológicas.
Ano: 1994
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000100009

Soybean yield and quality a function oflime and gypsum applications
Provedor de dados: 63
Autores: Caires,Eduardo Fávero; Churka,Susana; Garbuio,Fernando José; Ferrari,Roseli Aparecida; Morgano,Marcelo Antonio.
Effects of lime and gypsum applications on the quality of soybeans grown under no-till (NT) are not well defined yet. A field trial established in 1998 on a dystrophic clayey Rhodic Hapludox, at Ponta Grossa, State of Paraná, Brazil, evaluated grain yield and soybean quality based on oil, protein and nutrient content, after lime and gypsum applications under NT, in a randomized complete block design (n = 3), split-plot experiment. In the main plots, the treatments with dolomitic lime were: control (no lime), split application of lime on the surface (three yearly applications of 1.5 Mg ha¹), surface lime (4.5 Mg ha¹), and incorporated lime (4.5 Mg ha¹). Subplots received four different rates of gypsum: 0, 3, 6, and 9 Mg ha-1. The soybean crop was evaluated...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycine max (L.) Merrill; Soil acidity; Oil; Protein; Nutrient.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000400008

Molecular identification based on coat protein sequences of the Barley yellow dwarf virus from Brazil
Provedor de dados: 63
Autores: Mar,Talita Bernardon; Lau,Douglas; Schons,Jurema; Yamazaki-Lau,Elene; Nhani Jr.,Antônio.
Yellow dwarf disease, one of the most important diseases of cereal crops worldwide, is caused by virus species belonging to the Luteoviridae family. Forty-two virus isolates obtained from oat (Avena sativa L.), wheat (Triticum aestivum L.), barley (Hordeum vulgare L.), corn (Zea mays L.), and ryegrass (Lolium multiflorum Lam.) collected between 2007 and 2008 from winter cereal crop regions in southern Brazil were screened by polymerase chain reaction (PCR) with primers designed on ORF 3 (coat protein - CP) for the presence of Barley yellow dwarf virus and Cereal yellow dwarf virus (B/CYDV). PCR products of expected size (~357 bp) for subgroup II and (~831 bp) for subgroup I were obtained for three and 39 samples, respectively. These products were cloned...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Luteoviridae; Poaceae; Small grains; Wheat; Oat.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162013000600008

Oxidative stability of biodiesel from soybean oil fatty acid ethyl esters
Provedor de dados: 63
Autores: Ferrari,Roseli Ap.; Oliveira,Vanessa da Silva; Scabio,Ardalla.
Biodiesel consists of long-chain fatty acid esters, derived from renewable sources such as vegetable oils, and its utilization is associated to the substitution of the diesel oil in engines. Depending on the raw material, biodiesel can contain more or less unsaturated fatty acids in its composition, which are susceptible to oxidation reactions accelerated by exposition to oxygen and high temperatures, being able to change into polymerized compounds. The objective of this work was to determine the oxidative stability of biodiesel produced by ethanolysis of neutralized, refined, soybean frying oil waste, and partially hydrogenated soybean frying oil waste. The evaluation was conducted by means of the Rancimat® equipment, at temperatures of 100 and 105ºC,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Rancimat®; Transesterification; Oxidation.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000300014

Decoquinate, lasalocid and monensin for starter feeds and the performance of holstein calves to 20 weeks of age
Provedor de dados: 63
Autores: Nussio,Carla Maris Bittar; Huber,John Tal; Nussio,Luiz Gustavo.
The large utilization of coccidiostats in dairy herds has raised the question regards the best product to use, based on better animal performance. Sixty-four Holstein calves were randomly assigned to four treatments at 10 (±4) d of age to evaluate calf performance when fed approved coccidiostats available on the market in Arizona, USA. Calves received a dry calf starter without (control) or with one of the following coccidiostats: lasalocid, 30 mg kg-1; decoquinate, 19 mg kg-1; and monensin, 30 mg kg-1. Calves received 3.6 kg d-1 of a commercial 22% CP:20% fat milk replacer until 6 wk of age. Calves were offered starter "ad libitum" up to 2 kg d-1, and calves had free access to water throughout the trial. Alfalfa hay was offered "ad libitum" after weaning....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coccidiostats; Feed efficiency; Growth; Ionophore; Weight gain.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000300002

Performance of super hybrid rice cultivars grown under no-tillage and direct seeding
Provedor de dados: 63
Autores: Huang,Min; Zou,Yingbin; Jiang,Peng; Xia,Bing; Xiao,Anmin.
Good progress has been made in the super hybrid rice (Oryza sativa L.) breeding in China. However, rice yield not only depends on the genetic characteristics but also on the agronomic practices. No-tillage and direct seeding (NTDS) is a simplified cultivation technology that greatly simplifies both land preparation and crop establishment. Aiming to determine the grain yield performance of super hybrid rice under NTDS and to identify critical factors that determine grain yield, field experiments were conducted in Nanxian, Hunan Province, China in 2009 and 2010. Two super hybrid cultivars, Liangyoupeijiu and Y-liangyou 1, were grown under conventional tillage and transplanting (CTTP) and NTDS. Grain yield, yield components, biomass production, crop growth...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Rice cultivation technologies; Grain yield comparison; Yield formation characteristics.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162012000200003

Phytomass mapping of the "seridó caatinga" vegetation by the plant area and the normalized difference vegetation indeces
Provedor de dados: 63
Autores: Costa,Thomaz Corrêa e Castro da; Accioly,Luciano José de Oliveira; Oliveira,Maria Ap. José de; Burgos,Nivaldo; Silva,Flávio Hugo Barreto Batista da.
Phytomass is a critical information for economic and environmental activities like the establishment of policies for timber resources, forest management, studies of plant nutrient cycling, CO2 sink, among other. The phytomass of a Caatinga area was obtained by an empirical method using normalized difference vegetation index (NDVI) of Landsat images, the plant area index (PAI) and the phytomass inventory. At a first stage, linear, logarithmic and non-linear models were developed and tested. Bush and tree specimens were considered in the study, so that most of the individuals that contribute to the spectral answer detected by satellite images were included. At a second stage, the orbital parameter NDVI was used to map the PAI, which was used to map the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: CO2; LAI; Aboveground biomass; Desertification.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000400014

Substrates for storing entomopathogenic nematodes (Rhabditida: Steinernematidae, Heterorhabditidae)
Provedor de dados: 63
Autores: Andaló,Vanessa; Cavalcanti,Ricardo Sousa; Molina,Juan Pablo; Moino Jr.,Alcides.
The survival of entomopathogenic nematodes under laboratory conditions is low. With the aim of evaluating substrates to extend the survival of entomopathogenic nematodes, suspensions of Heterorhabditis sp. JPM4 and Steinernema carpocapsae All (3,000 IJ mL-1) were added to dirt, fine sand, coarse sand, foam, expanded clay, phenolic foam, agar, corn starch, Plantmax®, and water. The substrates were placed on Petri dishes (5 cm) and kept at 16 ± 1°C. Survival evaluations were made after 30, 60, 90, 120, 150, and 180 days, with three replicates. After 180 d, a greater percentage of S. carpocapsae infective juveniles (IJs) were still alive in the foam treatment (57.5%) as compared to other treatments, while expanded clay (28.4%), Plantmax® (9.3%) and phenolic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Heterorhabditis; Steinernema; Biological control; Persistence; Survival.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000300013

Indicadores de determinação de cortes de cultivares de aveia forrageira
Provedor de dados: 63
Autores: Primavesi,Ana Cândida; Primavesi,Odo; Chinellato,Artur; Godoy,Rodolfo.
A produção de matéria seca total (MS) aumenta em função da idade da planta, mas simultaneamente ocorre decréscimo progressivo do seu valor nutritivo. O presente trabalho teve a finalidade de determinar a combinação de épocas de primeiro corte com a de intervalos de cortes da rebrota que proporcionasse a maior produção de matéria seca de aveia com as melhores características nutritivas. O delineamento experimental foi em blocos casualizados, com três repetições. Em 1994, os tratamentos foram organizados em fatorial 3 x 4 [três indicadores de primeiro corte: 60 dias depois da emergência, início de emborrachamento (IE) e 10% plantas encanadas (PE = alongamento do colmo, com elevação do meristema apical); quatro indicadores de intervalos de cortes da rebrota:...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Avena sativa; A. byzantina; A. strigosa; Alimentação animal; Determinação bromatológica.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000100014

DISTRIBUIÇÃO DE SUBSTRATOS NAS COLÔNIAS DE Atta laevigata (F. Smith, 1858) (HYMENOPTERA: FORMICIDAE)
Provedor de dados: 63
Autores: Moreira,Aldenise Alves; Forti,Luiz Carlos.
Estudou-se a distribuição de substratos em duas colônias adultas (L-1 e L-2) da saúva Atta laevigata (F. Smith, 1858), com áreas de terra solta de 26,10 e 31,30 m2. Alguns orifícios de abastecimento foram mapeados utilizando-se iscas de canudinhos plásticos impregnados com polpa cítrica. Depois selecionou-se três orifícios para o ninho L-1 e um orifício para o ninho L-2, onde foram colocadas iscas cítricas impregnadas com corantes azul, amarelo e vermelho e amarelo misturado com grãos de milho, respectivamente. Após 24 horas da colocação das iscas, as colônias foram mortas e escavadas totalmente. Durante a escavação, registrou-se a presença ou ausência dos corantes nas câmaras com cultura de fungo. Observou-se, neste trabalho, que as iscas com corantes...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Iscas formicidas; Saúvas; Insetos; Ninhos.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000200029

Classification of soil respiration in areas of sugarcane renewal using decision tree
Provedor de dados: 63
Autores: Farhate,Camila Viana Vieira; Souza,Zigomar Menezes de; Oliveira,Stanley Robson de Medeiros; Carvalho,João Luís Nunes; Scala Júnior,Newton La; Santos,Ana Paula Guimarães.
ABSTRACT: The use of data mining is a promising alternative to predict soil respiration from correlated variables. Our objective was to build a model using variable selection and decision tree induction to predict different levels of soil respiration, taking into account physical, chemical and microbiological variables of soil as well as precipitation in renewal of sugarcane areas. The original dataset was composed of 19 variables (18 independent variables and one dependent (or response) variable). The variable-target refers to soil respiration as the target classification. Due to a large number of variables, a procedure for variable selection was conducted to remove those with low correlation with the variable-target. For that purpose, four approaches of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil CO2 emission; Data mining; Variable selection; Soil temperature; Soil organic matter.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162018000300216

Seed quality and optimal spatial arrangement of fodder radish
Provedor de dados: 63
Autores: Oliveira,Andréa dos Santos; Carvalho,Maria Laene Moreira de; Nery,Marcela Carlota; Oliveira,João Almir; Guimarães,Renato Mendes.
Besides the use of fodder radish (Raphanus sativus var. oleiferus Metzg.) as green manure plant cover crops and animal feed, the seeds have high oil content and low viscosity, ideal characteristics for the production of biodiesel. Studies related to the technology of seed production for this species are insufficient to define the best spatial arrangement of plants in the field that provides higher yields associated with high-quality seeds. Thus, we investigated the space and density between plants that would be ideal for the production of high quality fodder radish seeds. We evaluated the agronomic characteristics and physical, physiological and seed health quality in recently harvested fodder radish in row spacings of 0.2, 0.4, 0.6, and 0.8 m and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Raphanus sativus L. var. oleiferus Metzg; Brazil; Production; Sowing density.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000400005

Income-elasticity of poultry meat consumption in metropolitan areas of Brazil
Provedor de dados: 63
Autores: Bacchi,Miriam Rumenos Piedade; Spolador,Humberto Francisco Silva.
Studies on the meat market behavior may result in interesting parameters for the market and public policy agents. The definition of the income-elasticity of poultry consumption enables the elaboration of prospective analysis on the potential demand of this product. Thus, the main objective of the present study is to estimate the income-elasticities of poultry consumption. Data from the 1995-96 and 1987-88 Consumer Expenditure Survey, published by IBGE (Brazilian Institute of Geography and Statistics), were used in the analysis. The elasticities were obtained by fitting a three-segment polygonal curve relating the logarithm of the per capita poultry meat consumption as a function of the per capita family income. Generalized Least Squares method was used for...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Meat market; Food consumption.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000300007

Poultry offal meal in broiler chicken feed
Provedor de dados: 63
Autores: Silva,Edney Pereira da; Rabello,Carlos Bôa-Viagem; Lima,Michele Bernardino de; Ludke,Jorge Vitor; Arruda,Emmanuele Maria Florêncio de; Albino,Luiz Fernando Teixeira.
An outstanding feature of poultry production that provides animal protein yield for human feeding is its short production cycle. This characteristic has a linear relationship with waste production. Increasing the inclusion of this residue in diets in the near future is desirable in step with the growth of poultry production since it offers a better environmental and nutritional alternative to current methods. We evaluated the effects on the performance and carcass characteristics of broiler chickens produced by the inclusion of poultry offal meal (POM) in their feed. Treatments consisted of a control diet (corn, Zea mays and soybean, Glycine max) and four diets with inclusion of 30, 60, 90 and 120 g kg-1 of POM. The diets were formulated based on the level...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Alternative ingredient; Byproduct of poultry; Digestible amino acid.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162014000300003

Comparação entre os métodos de envelhecimento acelerado e de deterioração controlada para avaliação da qualidade fisiológica de sementes de soja
Provedor de dados: 63
Autores: Rossetto,C.A.V.; Marcos Filho,J.
Com o objetivo principal de comparar os testes de envelhecimento acelerado e deterioração controlada na avaliação da qualidade fisiológica de sementes de soja, v. IAC-15, utilizaram-se três lotes de sementes, previamente armazenadas em condições normais de ambiente e, além do envelhecimento acelerado e da deterioração controlada, efetuaram-se observações referentes a germinação, primeira contagem do teste de germinação, condutividade elétrica e grau de umidade. Os resultados obtidos permitiram verificar, ainda que para um número restrito de amostras utilizadas neste trabalho, a possibilidade da identificação de diferenças na qualidade de sementes através do teste de deterioração controlada. Este se revelou menos drástico que o de envelhecimento, mas há...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycine max (L.) Merrill; Sementes; Testes de vigor; Deterioração controlada; Envelhecimento.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000100020

UV-C radiation on fresh fig quality
Provedor de dados: 63
Autores: Usberti,Franciane Colares Souza; Ferraz,Antonio Carlos de Oliveira.
ABSTRACT: Sanitization using chemical agents to reduce the microbiological load on the surface of agricultural products have the drawback of leaving residues. Conversely, physical treatments, such as ultraviolet radiation C (UV-C), are residue-free, non-toxic and environmentally friendly. Ripe figs are perishable, exhibiting an epidermis with low resistance to mechanical treatment, high water content and the ostiole, which is an open door that expedites undesirable microorganism penetration. In this study, the effect of different energy levels of UV-C radiation on the appearance and physico-chemical properties of the figs when stored at 10 °C and 20 °C was evaluated focusing on the technological parameters of the application of radiation. The energy levels...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ficus carica L.; Irradiation; Postharvest conservation; Micro-organism inactivation.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000300901

Haplodiploid androgenetic breeding in oat: genotypic variation in anther size and microspore development stage
Provedor de dados: 63
Autores: Cesaro,Taniela De; Baggio,Maria Irene; Zanetti,Silvia Andréia; Suzin,Marilei; Augustin,Lizete; Brammer,Sandra Patussi; Iorczeski,Edson Jair; Milach,Sandra Cristina Kothe.
Oat (Avena spp.) is poorly responsive to the haplodiploidization process, which leads to the production of homozygous lines in one step, increasing breeding efficiency. Androgenetic haploids in small grain cereal crops are obtained from microspores cultured at the mononucleate stage, which can be identified by the size of anthers. In order to identify the appropriate anther size for in vitro culture, microspore cytological analyses were made in Avena sativa cultivars UPF 7, UPF 18, UFRGS 14, Stout and Avena sterilis CAV 3361, cultivated in growth chamber under controlled light and temperature conditions. Variation was observed within and among genotypes for anther size at each microspore developmental stage and according to the position of spikelets in the...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Androgenesis; Anther culture; Biotechnology; Haploid breeding; Microspores.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000100016

Extração e fitodisponibilidade de metais em resposta à adição de lodo de esgoto no solo
Provedor de dados: 63
Autores: Simonete,Marcia Aparecida; Kiehl,Jorge de Castro.
Diante dos riscos ambientais relacionados ao uso agrícola de lodo de esgoto contendo metais foi realizado um experimento, com o objetivo de avaliar o efeito do lodo, combinado ou não com P, K e PK, sobre o acúmulo de metais na parte aérea das plantas e comparar a eficiência de extratores na fitodisponibilidade de metais. Amostras da camada de 0-20 cm de um Argissolo Vermelho Amarelo eutrófico foram transferidas para vasos e tratadas com doses equivalentes a 0, 10, 20, 30, 40 e 50 Mg ha-1 de lodo (base seca). Após 30 dias de incubação, determinou-se os teores de Fe, Mn, Cu, Zn, Cd, Ni, Cr e Pb (extraídos por HCl 0,1 mol L-1, Mehlich-3 e DTPA pH 7,3), procedeu-se aplicação de duas doses de P (0 e 100 mg kg-1) e duas dose de K (0 e 100 mg kg-1). Cultivaram-se...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Milho; DTPA; Mehlich-3; HCl.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000300022

Methods to verify parameter equality in nonlinear regression models
Provedor de dados: 63
Autores: Carvalho,Lídia Raquel de; Pinho,Sheila Zambello de; Mischan,Martha Maria.
In biologic experiments, in which growth curves are adjusted to sample data, treatments applied to the experimental material can affect the parameter estimates. In these cases the interest is to compare the growth functions, in order to distinguish treatments. Three methods that verify the equality of parameters in nonlinear regression models were compared: (i) developed by Carvalho in 1996, performing ANOVA on estimates of parameters of individual fits; (ii) suggested by Regazzi in 2003, using the likelihood ratio method; and (iii) constructing a pooled variance from individual variances. The parametric tests, F and Tukey, were employed when the parameter estimators were near to present the properties of linear model estimators, that is, unbiasedness,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Logistic model; Treatments comparison.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000200014

Tamanho da semente e o teste de envelhecimento acelerado para soja
Provedor de dados: 63
Autores: Marcos Filho,Júlio; Novembre,Ana Dionisia Coelho; Chamma,Helena Maria Carmignani Pescarin.
A pesquisa teve como objetivo avaliar a possível relação entre efeitos da utilização de sementes de soja com diferentes tamanhos nos resultados do teste de envelhecimento acelerado. Foram analisados lotes dos cultivares BR-37 e Embrapa 48 (sementes não classificadas e de três tamanhos, classificadas em peneiras de crivos oblongos). Para cada lote e peneira, foram distribuídas três subamostras de 42,5 g de sementes, em camadas simples ou pré-pesadas (42,5 g) na superfície da tela metálica de cada compartimento individual (caixa plástica), utilizado como câmara interna para a condução do teste. Cada caixa plástica recebeu 40 mL de água (constituindo ambiente com 100% U.R. do ar) ou 40 mL de solução saturada de cloreto de sódio (ambiente com 76% U.R.)....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycine max; Semente; Análise; Potencial fisiológico; Vigor.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000300016

Programa multimídia para fabricação do açúcar cristal de cana-de-açúcar
Provedor de dados: 63
Autores: Marques,Tadeu Alcides; Serra,Gil Eduardo.
Os cálculos para projetos de usinas de açúcar, os testes em laboratório de situações reais dentro das indústrias e as atividades de ensino na tecnologia da fabricação de açúcar e álcool são árduas tarefas de execução, seja pela complexidade dos cálculos, grandes variações de equipamentos e processos, como as difíceis tarefas de descrição dos equipamentos participantes dos processos. O presente trabalho tem como objetivo a apresentação e disponibilização de software multimídia bem como a descrição técnica de seu desenvolvimento, cuja função é auxiliar o ensino do processo tecnológico e cálculos em usinas de açúcar. O programa é direcionado a professores, engenheiros e alunos da área. Devido ao grande avanço da informática, possibilitando novos recursos...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Açúcar; Cana-de-açúcar; Tecnologia; Multimídia; Simulação.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000300032

Evaluation of sunflower cultivars for central Brazil
Provedor de dados: 63
Autores: Porto,Willyam Stern; Carvalho,Claudio Guilherme Portela de; Pinto,Ronald José Barth; Oliveira,Marcelo Fernandes de; Oliveira,Ana Cláudia Barneche de.
Despite a large availability of areas suitable for sunflower cropping in Central Brazil, few adapted cultivars are available in the market. The objective of this work was to select sunflower cultivars adapted to this important production region. Experimental data from 2000 to 2004 were obtained by the National Sunflower Trials, coordinated by Embrapa Soja. The evaluated traits were grain and oil yields. Two criteria were used for selection of cultivars: i) the general mean obtained from different environments; ii) partitioning of general mean in favorable and unfavorable environments. Partitioning of the general mean allowed to detect the specific environment indicated for each cultivar. For grain yield, the cultivar Helio 251 presented general indication,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Helianthus annuus; Genetic breeding; Interaction genotypes &amp;times; Environments.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000200005

Xylem sap nitrogen compounds of some Crotalaria species
Provedor de dados: 63
Autores: Vitória,Angela Pierre; Sodek,Ladaslav.
Thirteen species of Crotalaria were analysed for nitrogen compounds in the xylem root bleeding sap. Amino acids were the main form of organic nitrogen found, but only traces of ureides were present. Of the four species analysed for amino acid composition, asparagine was found to be the major amino acid, accounting for over 68% of the nitrogen transported. No striking deviations from this general pattern was found between species, between vegetative and floral stages of development, or between nodulated and non-nodulated plants. It was concluded that the Crotalaria species studied here have an asparagine-based nitrogen metabolism, consistent with many other non-ureide-producing legume species.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Crotalaria; Transport; Nitrogen; Amino acids; Asparagine.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000300031

Quality of cut and basecutter blade configuration for the mechanized harvest of green sugarcane
Provedor de dados: 63
Autores: Toledo,Anderson de; Silva,Rouverson Pereira da; Furlani,Carlos Eduardo Angeli.
Quality control is used to evaluate processes and products, and is a powerful tool for reducing variability. The objective of this study was to evaluate the quality of green sugarcane (Saccharum spp.) cutting for mechanized harvest, using statistical quality control tools. Cutting height and damage to ratoon stalks caused by different blade and disc combinations of the basecutter mechanism were used as indicators of quality. Cutting height showed high variability with a controlled process for some treatments. However, these treatments were incapable of producing satisfactory results. The damage index was lower in treatments that used tilted blades, but above the target for all treatments, which caused significant damage to the ratoons. In general, the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cut height; Capability analysis; Damage index; Statistical process control.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162013000600002

Toxicidade comparativa de lambda- cyalothrin à lagarta-da-soja, Anticarsia gemmatalis Hueb., 1818 (Lepidoptera, Noctuidae) e ao percevejo verde, Nezara viridula (L., 1758) (Hemiptera, Pentatomidae)
Provedor de dados: 63
Autores: Baptista,G.C. de; Parra,J.R.P.; Haddad,M. de L.
O objetivo deste estudo foi avaliar, através dos valores de dose letal (DL50), a toxicidade comparativa do inseticida piretróide lambda-cyalothrin à lagarta-da-soja, Anticarsia gemmatalis e à ninfas do percevejo verde, Nezara viridula, tomando-se como padrão de comparação o inseticida organofosforadomonocrotofós. Os experimentos foram realizados em condições de laboratório por técnica de aplicação tópica, sendo usadas lagartas e ninfas, ambas de 3° instar. As avaliações das mortalidades foram feitas 3, 6, 24, 48 e 72 horas após o tratamento. O parâmetro DL50 foi determinado por análises de probit através de software apropriado. Lambda-cyalothrin agiu mais rapidamente do que monocrotofós contra as lagartas, sendo cerca de 140 a 190 vezes mais tóxico para...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Toxicidade comparativa; Lambda-cyalothrin; Monocrotofós; Anticarsia gemmatalis; Nezara viridula; Técnica de aplicação tópica.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000100031

EFEITO DA APLICAÇÃO DE UNICONAZOLE NA CULTURA  DE SOJA [(Glycine max (L.) MERRILL CV IAC-17)]
Provedor de dados: 63
Autores: RODRIGUES,J.D.; ONO,E.O.; FOLONI,L.L.
O presente trabalho foi conduzido no campo com o objetivo de estudar os efeitos da aplicação foliar de uniconazole (S-3307D) no início da floração em plantas de soja (Glycine max (L.) Merrill cv IAC-17). As dosagens de uniconazole utilizadas foram: 2,5; 5,0; 10,0 e 20,0 g i.a./ha. O delineamento experimental utilizado foi de blocos ao acaso, com 5 tratamentos contendo 4 repetições cada, sendo o tamanho de cada parcela de 40 m2, totalizando 800 m2 de área experimental. Para a avaliação dos efeitos do S-3307D sobre a produtividade de plantas de soja, foram realizadas as seguintes observações, no momento da colheita: produção (peso em Kg das plantas em 10 m2); número de plantas/10 m2; número de vagens/planta; número de grãos/vagem; peso de 100 grãos (em g);...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soja; Uniconazole; Desenvolvimento; Produtividade.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000200022

Construção e avaliação de psicrômetro aspirado de termopar
Provedor de dados: 63
Autores: Marin,Fábio Ricardo; Angelocci,Luiz Roberto; Coelho Filho,Maurício Antônio; Villa Nova,Nilson Augusto.
Construiu-se um psicrômetro de termopar aspirado, de baixo custo e fácil utilização em sistemas automáticos de aquisição de dados, utilizando-se tubos de PVC. A aspiração foi feita por ventiladores utilizados em microcomputadores e as temperaturas foram determinadas com junções de termopar de cobre-constantan. Para umidecimento do bulbo, utilizou-se um cordão de algodão. Os resultados da comparação com higrômetro capacitivo Vaisala Inc. e com psicrômetro aspirado tipo Assman mostraram que tanto em ambientes naturais como em controlados, a precisão e a exatidão das medidas foi muito boa, de maneira que o psicrômetro aqui descrito pode ser empregado para determinação da pressão atual de vapor e da umidade relativa sem perda de qualidade dos dados, e também...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Psicrometria; Psicrômetro ventilado; Umidade do ar; Tempertura do ar.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000400028

Dinâmica do acúmulo de matéria seca em pastagens de Tifton 85 sob pastejo
Provedor de dados: 63
Autores: Pinto,Luiz Felipe de Moura; Silva,Sila Carneiro da; Sbrissia,André Fischer; Carvalho,Carlos Augusto Brandão de; Carnevalli,Roberta Aparecida; Fagundes,Jaílson Lara; Pedreira,Carlos Guilherme Silveira.
O acúmulo de forragem é o resultado líquido de dois processos concomitantes e antagônicos: o crescimento e a senescência e morte de tecidos. O presente trabalho teve por objetivo avaliar o processo de produção de forragem através do estudo de seus componentes; crescimento e senescência. Os tratamentos corresponderam a quatro condições de pasto caracterizadas pelas alturas de 5, 10, 15 e 20 cm, mantidas constante através do pastejo por ovinos em regime de lotação contínua e taxa de lotação variável. O delineamento experimental utilizado foi o de blocos completos casualizados, com quatro repetições. Foram avaliadas as seguintes respostas: alongamento de hastes, alongamento de folhas, senescência, filocrono e o número de folhas por perfilho. Os resultados...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cynodon; Crescimento; Senescência; Líquido; Fluxo de tecidos.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000300001

Comparison between climatological and field water balances for a coffee crop
Provedor de dados: 63
Autores: Bruno,Isabeli Pereira; Silva,Adriana Lúcia da; Reichardt,Klaus; Dourado-Neto,Durval; Bacchi,Osny Oliveira Santos; Volpe,Clóvis Alberto.
The use of climatological water balances in substitution to complete water balances directly measured in the field allows a more practical crop management, since the climatological water balances are based on data monitored as a routine. This study makes a comparison between these methods in terms of estimatives of evapotranspiration, soil water storage, soil available water, runoff losses, and drainage below root zone, during a two year period, taking as an example a coffee crop of the variety Catuaí, three to five years old. Climatological water balances based on the estimation of the evapotranspiration through the methods of Thornthwaite and Penman-Monteith, can reasonably substitute field measured balances, however underestimating the above mentioned...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Evapotranspiration; Soil water storage; Available water; Water deficit; Water excess.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000300001

Ensacamento de frutos do tomateiro visando ao controle de pragas e à redução de defensivos
Provedor de dados: 63
Autores: Jordão,Alexandre Luis; Nakano,Octávio.
O ensacamento de frutos durante o seu desenvolvimento na planta, além do objetivo de controlar pragas pode reduzir resíduos de defensivos e manejar aspectos qualitativos. Com o objetivo de controle das pragas Neoleucinodes elegantalis, Helicoverpa zea e Tuta absoluta e redução de resíduos de inseticidas, pencas de tomates, foram ensacadas com papel-manteiga. Além do efeito do ensacamento, foram testados dois repelentes de insetos. Foram realizados cinco tratamentos. A eficiência do ensacamento e dos repelentes foi verificada por meio do número médio de lagartas encontradas por tratamento. A quantidade de resíduo de metamidofós encontrada nos frutos ensacados e nos frutos expostos diretamente à pulverização foi comparada ao limite máximo permitido....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lycopersicon esculentum; Neoleucinodes elegantalis; Helicoverpa zea; Tuta absoluta; Custo de produção.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000200012

Soil structure degradation in patches of alfalfa fields
Provedor de dados: 63
Autores: Miretti,María Celeste; Imhoff,Silvia; Silva,Alvaro Pires da; Lavado,Raúl.
Alfalfa (Medicago sativa) is the basic forage resource for milk production in the flat Pampa of the Santa Fe Province of Argentina. However, the presence of microrelief with patches threatens the expansion of the area cultivated with alfalfa. The lower productivity in the patches is attributed to the inferior soil physical quality. The objectives of this study were to quantify indicators of soil physical quality and to establish the soil properties that would affect the alfalfa productivity in patches (PA) and normal areas (NA). Additionally, the macro and micro nutrient contents in both areas were determined. The experiment was carried out on an Aquic Argiudoll. Eighteen sampling sites, nine in NA and nine in PA were established. At each site, undisturbed...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil physical properties; Soil nutrient content; Alfalfa growth.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000500015

Crescimento, absorção e exportação de nutrientes por uma cultura de urucu
Provedor de dados: 63
Autores: Haag,H.P.; Rosalen,D.L.; Simão,S.; Minami,K.
Sementes de urucu (Bixa orellana L.) var. Peruana foram postas para germinar num substrato constituido de duas partes de terra para uma de matéria orgânica, onde foram adicionados 1,5g de superfosfato triplo por litro de substrato. Após 115 dias as plantas foram transplantadas para um Latossolo Vermelho Escuro Orto série "Luiz de Queiroz" de alta fertilidade natural. O espaçamento foi de 5m x 5m. Aos 201 dias foi feita uma adubação em cobertura com 5g de KCl + 10g de uréia por planta. Plantas foram coletadas a partir dos 115 dias com intervalos de 60 dias até a produção aos 507 dias. As plantas em número de quatro por amostragem foram subdivididas em folhas, ramos, caule e órgãos reprodutivos. Aos 507 dias foram coletados frutos que foram subdivididos em...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bixa orellana; Crescimento; Extração; Macronutrientes; Micronutrientes.
Ano: 1992
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161992000400009

Introducing the term 'Biocontrol Plants' for integrated pest management
Provedor de dados: 63
Autores: Parolin,Pia; Bresch,Cécile; Poncet,Christine; Desneux,Nicolas.
Studies of interactions between crops, additional plants, pests and beneficial organisms already exist as well as studies of natural enemy preference, dispersal, and abundance. However, these studies focus on tri-trophic interactions from an "arthropod" point of view. We think that in order to optimize crop protection methods we need to understand the effects that plant structures have on the various arthropods and on subsequent tri-trophic interactions. Although studies and reviews describing the role of secondary plants in Integrated Pest Management (IPM) exist, to date a general term which encompasses all plants added to a cropping system with the aim of enhancing IPM strategies has yet to be formulated. Therefore, we suggest a new term, "biocontrol...
Tipo: Info:eu-repo/semantics/other
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162014000100011

Camouflaging of seeds treated with pesticides mitigates the mortality of wild birds in wheat and rice crops
Provedor de dados: 63
Autores: Almeida,Alexandre de; Couto,Hilton Thadeu Zarate do; Almeida,Álvaro Fernando de.
Seeds used to plant wheat, corn and rice crops in Brazil are treated with the insecticide carbofuran associated with the dye rhodamine B, attracting granivorous birds and causing mortality during sowing. The objective of this study was to evaluate if using camouflaged seeds can minimize mortality caused by the ingestion of seeds with carbofuran. Alternatives for reducing mortality, such as using carbofuran without rhodamine B or replacing carbofuran by carbosulfan, were compared. Three experiments were carried out in regions of known bird mortality in the states of Paraná and São Paulo, Brazil, using conventional sowing over plowed soil in the traditional planting system, 15,896 kg of seeds in 111.46 ha. Bird carcasses were collected and dissected to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zenaida auriculata; Carbofuran; Rhodamine B; Carbosulfan; Gustatory repellents; Environmental impact.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000200008

Weathering deterioration in pre-harvest of soybean seeds: physiological, physical, and morpho-anatomical changes
Provedor de dados: 63
Autores: Pinheiro,Daniel Teixeira; Dias,Denise Cunha Fernandes dos Santos; Medeiros,André Dantas de; Ribeiro,João Paulo Oliveira; Silva,Felipe Lopes da; Silva,Laércio Junio da.
ABSTRACT: Successive cycles of water absorption and loss favor weathering deterioration, one of the main factors that affect the quality of soybean seeds. This study evaluated the physiological, physical, and morpho-anatomical changes in soybean seeds under weathering deterioration at the pre-harvest phase. Six soybean cultivars (BMX Apolo, DM 6563, NS 5959, NA 5909, BMX Potência, and TMG 1175) were produced in a greenhouse and underwent weathering deterioration through a rainfall simulation system, applying 0, 60, 120, and 180 mm of precipitation at pre-harvest phase. Each rainfall level was divided into two applications at an interval of 72 h: 60 mm (30 + 30), 120 mm (60 + 60), and 180 mm (90 + 90). After harvest, the seeds were evaluated for...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycine max L.; X-ray; Anatomy; Precipitation; Physiological quality.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000700602

Resistance to Pratylenchus brachyurus in Vitis species population through multivariate approaches and mixed models
Provedor de dados: 63
Autores: Santos,Paulo Ricardo dos; Viana,Alexandre Pio; Gomes,Vicente Martins; Preisigke,Sandra da Costa; Almeida,Odimar Ferreira de; Santos,Eileen Azevedo; Rodrigues,Daniele Lima; Rodrigues,Rosana; Walker,Michael Andrew.
ABSTRACT: Genetically diverse interspecific hybrids of Vitis were selected for resistance to Pratylenchus brachyurus. Three segregating populations with 57 hybrid crosses were evaluated. The parents included Vitis romanetiiC166-043 × 07355-075, 06354-047 × Cereza and 06354-047 × Nocera, selected from the germplasm bank at the University of California, Davis, the United States. The experiment was arranged in a randomized block design, with three replications and three plants per plot. Root mass, nematodes per gram of root and reproduction factor were determined and used as quantitative variables; 16 multi categoric descriptors were also evaluated. The traits were analyzed using the Ward-Modified Location Model procedure (Ward-MLM) for the composition of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vitis genotypes; Nematode; Root; Genetic variability.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162019001500424

Mineralogia e mobilidade de cations de uma alteração intempérica de diabásio
Provedor de dados: 63
Autores: Clemente,C.A.; Marconi,A.
Em uma seqüência de alteração intempérica de diabásio, situada no município de Capivari, SP, foram estudadas a mobilidade de cátions liberados no processo e a evolução mineralógica ocorrida. A seqüência situa-se em condições de clima sub-tropical semi-úmido e de boa drenagem. A mineralogia do diabásio, constituída essencialmente de plagioclásios e piroxênios, evoluiu para uma mineralogia simples, onde na fração argila do solo ocorre apenas a caulinita, associada a óxidos de ferro, que não foram determinados. Vermiculita ocorre nas fases intermediárias, como o único argilomineral 2:1. A lixiviação de cátions solúveis ocorre já nos primeiros estágios do processo, seguidos da sílica, também com remoção rápida, mas que, em face de seu elevado teor na rocha de...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Diabásio; Intemperismo de rochas.
Ano: 1994
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000200021

Preferência alimentar de Diabrotica speciosa (Germ.) e Cerotoma sp. por genótipos de soja
Provedor de dados: 63
Autores: Lara,Fernando Mesquita; Elias,João Marcelo; Baldin,Edson Luiz Lopes; Barbosa,José Carlos.
Avaliou-se a preferência para alimentação de Diabrotica speciosa Germ. e Cerotoma sp. por diferentes genótipos de soja Glycine max L., sob condições de laboratório. Em testes com e sem chance de escolha utilizando-se discos foliares, os genótipos BR-82-12547, GO-BR-83-37004 e IAC 8 foram os mais preferidos e danificados; os genótipos PI 274454, PI 229358 e IAC 742832 destacaram-se como os menos preferidos nos dois testes, sugerindo serem resistentes aos dois crisomelídeos. Em testes com e sem chance de escolha, utilizando-se extratos aquosos das folhas, os genótipos IAC-8, PI 229358 e BR-82-12547 mostraram-se os mais preferidos, já PI 274454 e IAC 742832 evidenciaram ser resistentes às duas espécies de inseto.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Insecta; Chrysomelidae; Extrato aquoso; Resistência de plantas.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000400023

Detecção de bacteriocinas produzidas por bactérias fitopatogênicas dos gêneros Erwinia, Pseudomonas e Xanthomonas
Provedor de dados: 63
Autores: Biagi,C.M.R. de; Azevedo,J.L. de.
A detecção da produção de bacteriocinas foi estudada em diferentes condições, utilizando-se linhagens de bactérias fitopatogênicas dos gêneros Erwinia, Pseudomonas e Xanthomonas. Obtiveram-se, respectivamente, 58,06%, 71,31% e 40,00% de linhagens produtoras no meio 523, que foi o mais indicado para detecção dessa produção. Uma maior concentração de ágar adicionada ao meio (1,5%) produziu melhores resultados mas, a quantidade de meio nas placas não influenciou a detecção de bacteriocinas. O maior tempo de incubação utilizado (72 h.) facilitou detecção de halos de produção de bacteriocinas. Irradiação com luz ultra-violeta em baixas doses parece facilitar a liberação de bacteriocinas, mas isso varia com a linhagem empregada.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bacteriocinas; Xanthomonas; Pseudomonas; Erwinia.
Ano: 1992
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161992000400002

Identifying forest ecosystem regions for agricultural use and conservation
Provedor de dados: 63
Autores: Lin,Chinsu; Trianingsih,Desi.
ABSTRACT Balancing agricultural needs with the need to protect biodiverse environments presents a challenge to forestry management. An imbalance in resource production and ecosystem regulation often leads to degradation or deforestation such as when excessive cultivation damages forest biodiversity. Lack of information on geospatial biodiversity may hamper forest ecosystems. In particular, this may be an issue in areas where there is a strong need to reassign land to food production. It is essential to identify and protect those parts of the forest that are key to its preservation. This paper presents a strategy for choosing suitable areas for agricultural management based on a geospatial variation of Shannon's vegetation diversity index (SHDI). This index...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Species diversity; Ecological impact values; Forest planning and zoning; Geospatial biodiversity mapping; Principal component regression.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000100062

Componentes morfológicos e produção de matéria seca de milho em função da aplicação de calcário e zinco
Provedor de dados: 63
Autores: Andreotti,Marcelo; Souza,Euclides Caxambu Alexandrino de; Crusciol,Carlos Alexandre Costa.
O milho é uma das plantas que mais responde positivamente à aplicação de zinco no solo, com ganhos na produção de matéria seca e grãos. Entretanto, a disponibilidade e a absorção do elemento pelas plantas são influenciadas negativamente pela elevação do pH, da V% e do teor de P nos solos. Para estudar o efeito da calagem e do zinco aplicado na adubação, e o seus efeitos residuais sobre a produção de matéria seca e o desenvolvimento das plantas de milho, foram realizados três cultivos subsequentes, em condição de casa de vegetação, utilizando-se vasos que receberam 20 kg de um Latossolo Vermelho distrófico. O delineamento experimental foi inteiramente casualizado em esquema fatorial 3x3, com três saturações por bases (15, 50 e 70%) e três teores de zinco no...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Matéria seca; Desenvolvimento da planta; Saturação por bases; Adubação; Micronutriente.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000200015

Estimation of soybean genetic progress in the South of Brazil using multi-environmental yield trials
Provedor de dados: 63
Autores: Lange,Cláudia Erna; Federizzi,Luiz Carlos.
The success of a genetic breeding program in a certain period can be assessed by the genetic gain observed. Genetic progress can be estimated from the multi environmental trials (MET) data which are routinely carried out by annual species breeding programs for the assessment of new commercial cultivars. A data set of 20 years of MET of advanced soybean lines derived from four breeding programs was used to estimate and to compare the genetic gains obtained for three soybean maturity groups (early, medium and late) in four cropping regions of the State of Rio Grande do Sul. The estimated yield gains ranged from 0.0 to 71.5 kg ha-1 year-1 (3.49% per year), depending on the maturity group and region, which suggests that the genetic breeding effort does not...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycine max (L.) Merrill; Genetic gain; Maturity groups; Advanced lines.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000300005

Diallel crossing among maize populations for resistance to fall armyworm
Provedor de dados: 63
Autores: Alvarez,María del Pilar; Miranda Filho,José Branco de.
Among the insects infecting the maize (Zea mays L.) crop in Brazil, the fall armyworm (Spodoptera frugiperda Smith, 1797, Lepdoptera: Noctuidae) is considered one of the most important because it causes the highest damage to yield. Genetic resistance to the fall armyworm has be an effective control strategy. The main objective of this work was to evaluate new germplasm sources for resistance to the fall armyworm, the key pest for the maize crop in Brazil. A partial diallel design between 20 varieties of Brazilian germplasm and nine exotic and semi-exotic varieties of different origin was used. The 180 crosses and 29 parental varieties along with two commercial checks were evaluated in three locations in the State of São Paulo State (Brasil). Fall armyworm...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Genetic resistance; Partial diallel; Germplasm.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000400017

Efeitos de potenciais de água no solo, em diferentes estádios fenológicos da cultura da cevada (Hordeum vulgare L.)
Provedor de dados: 63
Autores: Urchei,M.A.; Rodrigues,J.D.
Objetivando avaliar os efeitos de défices hídricos, em três estádios fonológicos da cultura da cevada (Hordeum vulgare L.), foi conduzido experimento em vasos, com delineamento em blocos ao acaso. Foram utilizados nove tratamentos decorrentes da combinação dos potenciais mínimos de água no solo de -0,05, -0,20 e -1,50 MPa, com os estádios fenológicos de máximo perfilhamento, florescimento e grão leitoso, permanecendo uniformizados durante o restante do ciclo, entre os potenciais de -0,01 a -0,05 MPa. Os resultados de produção, peso e teor de proteína dos grãos, tamanho de espigas, número total e número de espigas chochas, mostraram que os efeitos de défices hídricos variaram com a intensidade, duração e estádio fenológico da cultura, onde o estádio de...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Potencial hídrico do solo; Cevada; Fases fenológicas.
Ano: 1994
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000300027

Phosphorus acquisition by wheat from organic and inorganic sources labelled with 32P and 33P radioisotopes
Provedor de dados: 63
Autores: Scrase,Franklin M.; Sinclair,Fergus L.; Farrar,John F.; Pavinato,Paulo Sergio; Jones,Davey L.
ABSTRACT: Investment in soil phosphorus (P) capital in the tropics is often constrained by poor availability of mineral fertiliser to small-scale farmers. Consequently, new sustainable agricultural cropping strategies are required to maintain fertility and maximise crop yields. The co-application of Tithonia diversifolia (Tithonia) green manure and mineral fertiliser (KH2PO4) together (integrated nutrient management) in comparison to the addition of one or the other alone has been hypothesized to promote crop P uptake. The aim of this study was to critically evaluate the benefits of integrated nutrient management practices in laboratory experiments. Wheat was grown as a test crop in microcosms to which either 32P-labelled mineral fertiliser or 33P-labelled...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Tithonia diversifolia; 32P-labelled mineral fertiliser; 33P-labelled tithonia; Green manure; Sustainable agriculture.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000301403

Sorption and desorption of indaziflam degradates in several agricultural soils
Provedor de dados: 63
Autores: Alonso,Diego Gonçalves; Oliveira Jr,Rubem Silvério de; Koskinen,William Charles; Hall,Kathleen; Constantin,Jamil; Mislankar,Suresh.
ABSTRACT Processes regulating pesticide fate in the environment are influenced by the physicochemical properties of pesticides and soils. Sorption and desorption are important processes as they regulate the movement of pesticides in soil. Although sorption-desorption is widely studied for herbicides, studies involving their metabolites in soil are scarce. Sorption and desorption of indaziflam metabolites (indaziflam-triazinediamine (FDAT), indaziflam-triazine-indanone (ITI) and indaziflam-carboxilic acid (ICA)) were investigated in six Brazilian (BRA) soils and three United States (USA) soils with different physicochemical properties. The Freundlich equation described sorption of the metabolites for all soils (R2 &gt; 0.98; 1/n ~ 1). Sorption order (Kf)...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Adsorption; Hysteresis; Metabolites; Soil properties.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000200169

Drying and storage of Eugenia involucrata DC. seeds
Provedor de dados: 63
Autores: Maluf,Angela Maria; Bilia,Denise Augusta Camargo; Barbedo,Claudio José.
The physiological quality of seeds of native species is important to produce healthy saplings and therefore guarantee the success of programs to recover disturbed vegetation. This reinforces the necessity for investigating the physiological quality of those seeds. To evaluate the effects of different drying rates on the germination, moisture content and storability of Eugenia involucrata diaspores, mature fruits collected at Mogi Guaçu, SP, Brazil had their epi- and mesocarps removed by washing and were dried at 30, 40 or 50ºC until their water content was reduced from 57% (fresh diaspores) to 13% (final drying), totaling six drying levels. In a second experiment, diaspores had their moisture content reduced from 57% to 49%, at 30ºC, totaling six drying...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Germination; Drying rate; Recalcitrant seed.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000300009

Curvas de dose-resposta de biótipos resistente e suscetível de Bidens pilosa L. aos herbicidas inibidores da ALS
Provedor de dados: 63
Autores: Christoffoleti,Pedro Jacob.
A resistência de plantas daninhas aos herbicidas é um fenômeno de ocorrência mundial, sendo caracterizada como uma redução na resposta de uma população a produtos químicos, em sua dose recomendada, como resultado de sua aplicação sucessiva. O número de casos de resistência registrados no Brasil tem aumentado significativamente nos últimos anos, porém poucos estudos científicos têm sido feitos para elucidar este fenômeno. Sendo assim, foram conduzidos experimentos com o objetivo de elaboração de curvas de dose-resposta comparativa entre dois biótipos da planta daninha picão-preto (Bidens pilosa L.), sendo um resistente (R) e outro suscetível (S) aos herbicidas inibidores da ALS. Para isso, foram utilizados três herbicidas do grupo químico das sulfoniluréias...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Planta daninha; Resistência aos herbicidas; Sulfoniluréia; Imidazolinona.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000300016

Erratum
Provedor de dados: 63
Tipo: Info:eu-repo/semantics/article
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000300015

Boll weevil within season and off-season activity monitored using a pheromone-and-glue reusable tube trap
Provedor de dados: 63
Autores: Neves,Robério Carlos dos Santos; Torres,Jorge Braz; Barros,Eduardo Moreira; Vivan,Lúcia Madalena.
ABSTRACT: The boll weevil colonizes cotton fields as early as cotton squaring, causing significant losses due to feeding and protected development inside fruiting structures throughout crop phenology. Successful control depends on control of adults and their accurate detection when they colonize the crops. The commercial trap and boll weevil attract-and-control tubes (BWACT) are the only available tools to monitor and attract-and-kill boll weevil, despite limitation in efficacy, and insecticide in BWACT is not allowed in organic production. A grandlure-and-glue reusable and insecticide-free tube (GGT) made with polyvinyl chloride tube, smeared with entomological glue, and lured with pheromone was tested to detect boll weevil activity across various...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anthonomus grandis; Control threshold; Cotton pest; Survey.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162018000400313

Growth and survival of pink shrimp (Farfantepenaeus paulensis) postlarve in cages and pen enclosures
Provedor de dados: 63
Autores: Vaz,Luciano Jensen; Wasielesky Jr.,Wilson; Cavalli,Ronaldo Olivera; Peixoto,Silvio; Santos,Marcos Henrique Silva; Ballester,Eduardo.
Technology for the culture of the pink shrimp Farfantepenaeus paulensis in low-cost cages and pen enclosures was developed together with artisanal fishermen of the Patos Lagoon estuary, southern Brazil. Although the production of postlarvae (PL) under laboratory conditions is well documented, survival and growth during the nursery phase cages and pen enclosures in the nature has not yet been analyzed. Therefore, the present study compared survival and growth of F. paulensis postlarvae reared either in cages or pens. Six cages (2.0 ´ 2.0 ´ 1.4 m) of PVC-coated polyester with a mesh size of 1.5 mm were stocked with 800 PL26 each. To assess the effect of the substrate, a 10 cm layer of sand was added to three of these cages to simulate a pen enclosure. No...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Penaeidae; Aquaculture; Shrimp farming; Nursery.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000300016

Alteração de plagioclásios dos riodacitos da formação serra geral (JKsg) da região de Piraju - SP
Provedor de dados: 63
Autores: Truffi,Silvia Alessandra; Clemente,Celso Augusto.
A região de Piraju -- SP é caracterizada geologicamente por apresentar uma grande distribuição de rochas básicas e ácidas da Formação Serra Geral. Os processos e produtos de alteração das rochas básicas são apresentados em muitos trabalhos, mas estudos envolvendo alteração de rochas vulcânicas ácidas são raros. Apresentam-se os resultados de estudos petrológicos, químicos e mineralógicos nas rochas vulcânicas ácidas (riodacitos da Formação Serra Geral), nos produtos de alteração dessas rochas, dando ênfase para a evolução mineralógica dos plagioclásios. Os riodacitos da Fm. Serra Geral (JKsg) possuem em sua composição mineralógica cerca de 60-65% de plagioclásios configurando assim a parte mais importante de sua constituição. O estudo da alteração desses...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Riodacito; Plagioclásio; Hidrólise; Caulinita; Gibbsita.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000200026

Recuperação do fósforo residual do solo, derivado de um termofosfato magnesiano com diferentes granulometrias e do superfosfato simples granulado
Provedor de dados: 63
Autores: Stefanutti,R.; Malavolta,E.; Muraoka,T.
O trabalho compara a recuperação do P2O5 residual através de cultivos sucessivos em um solo que recebeu doses crescentes de um termofosfato magnesiano com diferentes granulometrias e superfosfato simples granulado. Os resultados obtidos pela determinação do P extraído pelas plantas em 7 cultivos em vaso permitem concluir que o termofosfato na forma pó, apresenta efeito residual semelhante ao do superfosfato simples granulado; a granulometria mais grosseira do produto termofosfato resultou em menor recuperação do fósforo residual.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Termofosfato magnesiano; Fósforo; Fósforo residual; Granulometria; Fontes de fósforo.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000200005

Electrical conductivity and soybean seedling emergence
Provedor de dados: 63
Autores: Colete,Julio Cesar Fachini; Vieira,Roberval Daiton; Dutra,Alek Sandro.
Evaluation of soybean [Glycine max (L.) Merrill] seeds vigor and its relation with field seedling emergence can provide secure indicatives of seed physiological potential. The present research studied the relationship between the electrical conductivity test and the seedling emergence of soybean in field and laboratory. The field experiment was sown in November 26th, December 3td and 10th, 2000. Laboratory tests were performed using levels of water potential in the substrate (soil) -0.03; -0.2; -0.4; and -0.6 MPa. Fourteen seed lots, seven of 'Embrapa 48' and seven of 'BRS 133' soybean cultivars were used. Laboratory tests comprised seed water content determination, before and after the accelerated aging; germination and vigor tests (accelerated aging and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycine max; Seed analysis; Water content; Vigor; Water potential.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000400006

A system to evaluate the performance of hydraulic nozzles used in stored grain preotection trials
Provedor de dados: 63
Autores: Vásquez-Castro,Javier A.; Baptista,Gilberto C. de; Gadanha Jr.,Casimiro D.; Trevizan,Luiz R.P.
We developed a system to evaluate the performance of hydraulic nozzles used in stored corn and wheat grain protection experiments. An insecticidal mix was used as test fluid to determine the transversal volumetric distribution and droplets spectrum of a model TJ-60 8002EVS hydraulic nozzle. A mobile application system was built to apply a rate equivalent to 5 L t-1 and obtain theoretical concentrations of 10 and 0.5 mg kg-1 of fenitrothion and esfenvalerate, respectively. The corn and wheat grains were spread out as a fine layer. Three glass slides (0.1 × 0.05 m) were placed on the top surface of the grains to ensure that the intended application rate was achieved. After treatment, the deposits on both matrices were analyzed by gas chromatography. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Application technology; Gas chromatography; Insecticide deposits; Corn; Wheat.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000600001

Thermal and pasting properties of cassava starch-dehydrated orange pulp blends
Provedor de dados: 63
Autores: Leonel,Magali; Souza,Luciana Bronzi de; Mischan,Martha Maria.
Instant mixtures are easy to prepare and frequently present functional appeals. A quality parameter for instant mixtures is their rheological behavior. This study aimed at evaluating the effects of extrusion parameters on the pasting properties of cassava (Manihot esculenta L.) starch and dehydrated orange (Citrus sinensis (L.) Osbeck) pulp mixtures. The variable parameters were moisture of mixtures (12.5 to 19%), barrel temperature (40 to 90ºC) and screw rotation (170 to 266 rpm). The extruded mixtures did not show gelatinization enthalpy. Moisture had the greatest effect on paste properties. The initial pasting viscosity (before heating) of RVA (Rapid visco analyzer) is the most relevant parameter to instant mixtures. The highest cold viscosity values...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Manihot esculenta; Fiber; Viscosity; Extrusion.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000300011

Absorption and mobility of radio-labelled calcium in chili pepper plants and sweet cherry trees
Provedor de dados: 63
Autores: Bonomelli,Claudia; Alcalde,Carolina; Aguilera,Camila; Videla,Ximena; Rojas-Silva,Ximena; Nario,Adriana; Fernandez,Victoria.
ABSTRACT: Calcium (Ca) is often supplied to crop species to prevent the occurrence of Ca–related disorders. Mechanisms of Ca absorption and transport are not fully understood and the effectiveness of root and/or foliar Ca fertilization may be variable. To characterize the rate of Ca absorption and transport, trials were developed with chili pepper and sweet cherry plants, using 45CaCl2 as a tracer. The Ca treatments supplied were: (1) No 45Ca (control); (2) 45Ca soil application; (3) 45Ca supply to basal leaves, and (4) 45Ca application to apical leaves. After two months, plants were harvested for biomass and Ca content determination. The recovery of 45Ca in different plant parts was measured with a liquid scintillation counter and leaf traits were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fertilizers; Fertilizer application methods; Horticultural crops; Plant nutrition; Radioisotopes.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000601403

Ballistic model to estimate microsprinkler droplet distribution
Provedor de dados: 63
Autores: Conceição,Marco Antônio Fonseca; Coelho,Rubens Duarte.
Experimental determination of microsprinkler droplets is difficult and time-consuming. This determination, however, could be achieved using ballistic models. The present study aimed to compare simulated and measured values of microsprinkler droplet diameters. Experimental measurements were made using the flour method, and simulations using a ballistic model adopted by the SIRIAS computational software. Drop diameters quantified in the experiment varied between 0.30 mm and 1.30 mm, while the simulated between 0.28 mm and 1.06 mm. The greatest differences between simulated and measured values were registered at the highest radial distance from the emitter. The model presented a performance classified as excellent for simulating microsprinkler drop...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Irrigation; Modeling; Simulation.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000400025

Field comparison between selection methods at the maize seedling stage in relation to aluminum tolerance
Provedor de dados: 63
Autores: Giaveno,Carlos Daniel; Miranda Filho,José Branco de.
Selection and breeding for aluminum tolerance is a useful approach to increase maize (Zea mays L.) grain yield in acid soils. The objective of this work was the comparison between two screening approaches for the development of Al tolerant maize populations. One cycle of divergent selection for aluminum tolerance, using both nutrient solution and pots with acid soil, were completed in the maize population SIKALQ. The four sub-populations selected through both selection procedures were compared with the original population and checks in field trials repeated over locations. Eight environments stratified into four groups varying from non acid to high aluminum saturation were used. Three variables were analyzed for comparisons of methodologies: grain yield,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays; Acid soils; Seedling; Divergent selection.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000200029

Respostas de braquiária brizantha a doses de potássio
Provedor de dados: 63
Autores: MATTOS,W.T. DE; MONTEIRO,F.A.
O experimento foi conduzido em casa-de-vegetação, envolvendo a forrageira Brachiaria brizantha (Hochst ex A.Rich.) Stapf. cv. Marandu, com o objetivo de avaliar o efeito de doses de potássio na produção de matéria seca, perfilhamento, concentração e distribuição relativa de potássio nas partes da planta. Utilizou-se sílica como substrato. Foram utilizadas oito doses de potássio (0; 9,75; 39; 78; 156; 234; 312 e 468 mg K L-1) em um delineamento experimental em blocos completos ao acaso, com quatro repetições. As plantas foram colhidas 38 dias após o transplante, no primeiro corte e 33 dias após este, no segundo corte, sendo separadas em folhas não-expandidas, lâminas de folhas novas, lâminas de folhas velhas e colmos mais bainhas. Por ocasião do segundo...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Potássio; Brachiaria brizantha cv. Marandu; Produção de matéria seca; Perfilhamento; Partes da planta.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000300011

Technological properties of latex and natural rubber of Hevea brasiliensis clones
Provedor de dados: 63
Autores: Moreno,Rogério Manoel Biagi; Ferreira,Mariselma; Gonçalves,Paulo de Souza; Mattoso,Luiz Henrique Capparelli.
Rubber industry has increased the requirements for quality and uniformity of natural rubber produced in Brazil. Technological properties of latex and natural rubber of clones GT 1, PB 235, IAN 873 and RRIM 600 [Hevea brasiliensis (Willd. Former Adr. de Juss.) Muell.- Arg] were evaluated by standard methods of the dry rubber content (DRC%), percentage of nitrogen (N%) and percentage of ashes (ASH%) in two consecutive years; data were correlated with temperature and precipitation. Properties of latex and natural rubber varied (P &lt; 0.01) as a function of clone type and among tappings. DRC decreased in the beginning of the dry season (May to June) and N% and ASH% increased in the same period. April to June was a critical period, when N% was above 0.60%, out...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Rubber tree; Standard methods; Productivity; Environmental conditions.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000200005

Maturation curves and degree-days accumulation for fruits of 'Folha Murcha' orange trees
Provedor de dados: 63
Autores: Stenzel,Neusa Maria Colauto; Neves,Carmen Silvia Vieira Janeiro; Marur,Celso Jamil; Scholz,Maria Brígida dos Santos; Gomes,José Carlos.
The effect of thermal summation on orange fruit growth on different rootstocks has not been studied for the State of Paraná, Brazil. This research evaluated the growth of fruits by means of maturation curves, and quantified the growing degree-days (GDD) accumulation required for fruit maturation in 'Folha Murcha' orange trees budded on 'Rangpur' lime, 'Volkamer' lemon, 'Sunki' mandarin, and 'Cleopatra' mandarin, in Paranavaí and Londrina, PR. In both locations and all rootstocks, the fruits showed evolution in total soluble solids (TSS) content in relation to GDD accumulation, with a quadratic tendency of curve fitting; total titratable acidity (TTA) had an inverse quadratic fitting, and the (TSS/TTA) ratio showed a positive linear regression. Fruits in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Citrus sinensis; Thermal summation; Juice quality; Rootstocks.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000300002

Numerical modeling of three-dimensional transient root growth with simultaneous water flow and nutrient transport
Provedor de dados: 63
Tipo: Info:eu-repo/semantics/article
Ano: 1997
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161997000300005

Common bean cultivars and lines interactions with environments
Provedor de dados: 63
Autores: Carbonell,Sérgio Augusto Morais; Azevedo Filho,Joaquim Adelino de; Dias,Luiz Antônio dos Santos; Garcia,Antonio Augusto Franco; Morais,Lizz Kezzy de.
The performance of bean lines brought forth in breeding programs or of cultivars in use can be affected by environmental variability. The adaptability and stability of grain yield of 18 common bean cultivars and lines in 23 environments (combinations of seasons, years and locations) were evaluated in the State of São Paulo, Brazil. 'IAC-Carioca' and 'IAC-Carioca Eté' were used as standard cultivars for the carioca grain type, while 'FT-Nobre' and 'IAC-Una' represented the standard for black grains. The experiment was set up in a randomized complete block design with four replications and plots consisting of two, two central five meters rows flanked by border rows. Stability parameters were estimated by the methods Maximum Yield Deviations (MYD) and by the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phaseolus vulgaris; AMMI; Adaptability; Stability; Cultivar.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000200008

Cultivar affects browning susceptibility of freshly cut star fruit slices
Provedor de dados: 63
Autores: Teixeira,Gustavo Henrique de Almeida; Durigan,José Fernando; Mattiuz,Ben-Hur; Alves,Ricardo Elesbão; O'Hare,Timothy James.
Consumption of freshly-cut horticultural products has increased in the last few years. The principal restraint to using freshly-cut carambola is its susceptibility to tissue-browning, due to polyphenol oxidase-mediated oxidation of phenolic compounds present in the tissue. The current study investigated the susceptibility to browning of star fruit slices (Averrhoa carambola L.) of seven genotypes (Hart, Golden Star, Taen-ma, Nota-10, Malásia, Arkin, and Fwang Tung). Cultivar susceptibility to browning as measured by luminosity (L*) varied significantly among genotypes. Without catechol 0.05 M, little changes occurred on cut surface of any cultivars during 6 hour at 25°C, 67% RH. Addition of catechol led to rapid browning, which was more intense in cvs....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Averrhoa carambola L.; Cathecol; Polyphenol oxidase; Minimally processed; Fresh-cut.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000100001

Growth of Burkholderia sacchari LFM 101 cultivated in glucose, sucrose and glycerol at different temperatures
Provedor de dados: 63
Autores: Nascimento,Valkirea Matos; Silva,Luiziana Ferreira; Gomez,José Gregório Cabrera; Fonseca,Gustavo Graciano.
ABSTRACT Polyhydroxyalkanoates (PHAs) have attracted major industrial interest as alternatives to conventional plastics. They are produced by several bacteria as cytoplasmic inclusions when nutrients are in limited supply. Among the many factors influencing bacterial growth, the effect of temperature on both specific growth rates and growth yields in terms of carbon source intake is of considerable interest. This study aimed to evaluate the influence of the bacterium Burkholderia sacchari LFM 101 on growth and PHA production, using glucose, sucrose or glycerol as a carbon source, at 30 and 35 °C. The results showed that B. sacchari cultured with glucose at 35 °C presented both higher productivity and polymer yield in dried cell mass. There were no...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Polyhydroxyalkanoates (PHAs); Metabolism; Kinetics.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000500429

On the controlling of temperature: A proposal for a real-time controller in broiler houses
Provedor de dados: 63
Autores: Detsch,Denise Trevisoli; Conti,Dante; Diniz-Ehrhardt,Maria Aparecida; Martínez,José Mario.
ABSTRACT: Environmental conditions in broiler houses, specifically temperature, are key factors that should be controlled to ensure appropriate environment for broiler rearing. In countries with tropical/subtropical climate, like Brazil, high temperatures produce heat stress to animals, affecting the production process. This research proposes a real-time model to control temperature inside broiler houses. The controller is a self-correcting model that makes real-time decisions on the ventilation system operation (exhaust fans) together with temperature prediction at the facility. The model involves partial differential equations (PDE) whose parameters are updated according to data registered in real-time. Some experiments were carried out at a pilot farm...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Partial differential equations (PDE); Temperature control; Optimization; Self-correcting model; Ventilation systems.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162018000600445

UTILIZAÇÃO DO TESTE DE CONDUTIVIDADE ELÉTRICA PARA  PREVISÃO DO POTENCIAL GERMINATIVO DE SEMENTES DE INGÁ
Provedor de dados: 63
Autores: BARBEDO,C.J.; CICERO,S.M.
Sementes de espécies do gênero Inga apresentam curta longevidade em condições naturais, freqüentemente inferiores a 15 dias. O teste de germinação para estas sementes tem duração de 7 a 15 dias, tornando-o de difícil aplicabilidade na separação de lotes de sementes a serem beneficiados e armazenados. Assim, esta pesquisa visou verificar a eficiência da utilização do teste de condutividade elétrica na separação, quanto à qualidade fisiológica, de lotes de sementes de ingá (Inga uruguensis Hook. &amp;amp; Arn.). Foram utilizados três lotes de sementes distintos quanto à sua época de coleta, cada qual com dois sublotes em função da forma de obtenção (colheita diretamente nas árvores e coleta sobre o solo). Todos foram armazenados por período de 80 dias, em...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Qualidade de sementes; Avaliação rápida; Semente recalcitrante.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000200013

Atributos físicos de latossolos ácricos do norte paulista
Provedor de dados: 63
Autores: Alleoni,L.R.F.; Camargo,O.A. de.
Neste trabalho foram quantificadas a argila dispersa em água (ADA), a água disponível (AD) e a superfície específica (SE) de amostras superficiais e subsuperficiais de três latossolos ácricos paulistas. Estes atributos foram relacionados com a carga elétrica líquida, o ponto de efeito salino nulo e o potencial elétrico superficial. As quantidades de argila dispersa em água diminuíram bastante em profundidade, tendo seus valores variado de 0 a 2% no horizonte B. Nestas camadas, a densidade de carga elétrica, o potencial elétrico superficial e o deltapH estiveram próximos da neutralidade, favorecendo a floculação dos colóides. Os teores de água disponível foram baixos em todas as amostras (&lt;6%), com exceção da camada superficial de um dos latossolos, onde...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Solos ácrícos; Argila dispersa em água; Água disponível; Superfície específica.
Ano: 1994
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000200019

Performance and genetic assessment of rubber tree clones in Southern Thailand
Provedor de dados: 63
Autores: Pethin,Denduang; Nakkanong,Korakot; Nualsri,Charassri.
Thailand is the world leader in the production of latex extracted from the rubber tree (Hevea brasiliensis). However, the most cultivated clone RRIM 600, is highly susceptible to diseases, and there is economic incentive to develop new rubber tree clones. Four rubber tree clones (T2, SK1, NK1 and SK3) that have high latex yield potential from plantations in Southern Thailand were selected for this study. Yield performance, latex biochemical parameters and anatomical characteristics of bark were monitored for two years, using RRIM 600 clones in the same fields as paired controls. The average yields of the clones SK1, NK1 and SK3 were 129.3, 74.2 and 53.9 g per tree per tapping, respectively, surpassing the paired RRIM 600 controls (94.3, 49.9 and 43.9 g per...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hevea brasiliensis; Random Amplified Polymorphic DNA; Latex yield; Latex biochemical parameters; Anatomical characteristics of bark.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162015000400306

Métodos de inoculação de Colletotrichum fragariae em morangueiro
Provedor de dados: 63
Autores: Tanaka,Maria Aparecida de Souza; Passos,Francisco Antonio; Betti,Juarez Antonio; Pires,Regina Célia de Matos.
A antracnose do morangueiro, causada por Colletotrichum fragariae Brooks, é uma das mais importantes doenças da cultura. Além dos rizomas, o fungo causa lesões em estolhos, pecíolos, limbos foliares, pedúnculos e frutos. A inoculação de plantas com este patógeno é muitas vezes imprescindível em trabalhos que necessitam uniformidade de inóculo e reprodução de sintomas da doença. Isso ocorre em testes de patogenicidade, em testes de eficácia de métodos de controle, em estudos sobre a variabilidade de diferentes isolados do patógeno e em avaliação de germoplasma quanto à resistência à doença. Objetivou-se, neste trabalho, avaliar comparativamente sete métodos de inoculação de morangueiro com C. fragariae, descrevendo os sintomas obtidos em diferentes órgãos...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fragaria × ananassa; Antracnose; Avaliação de doença.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000400012

Carbon and nitrogen stocks of an Arenosol under irrigated fruit orchards in semiarid Brazil
Provedor de dados: 63
Autores: Bernardi,Alberto Carlos de Campos; Machado,Pedro Luiz Oliveira de Almeida; Madari,Beata Emoke; Tavares,Sílvio Roberto de Lucena; Campos,David Vilas Boas de; Crisóstomo,Lindbergue de Araújo.
Soil organic matter accumulation provides benefits to soil productivity and reduces atmospheric carbon concentration. However, little is known about the accumulation of C and N by sandy soils under perennial irrigated crops in semiarid regions. The objective of this study was to evaluate the effect of irrigated fruit orchard cultivation on the stocks of soil organic carbon (SOC) and total nitrogen (N) of an Arenosol/Quartzpsament from Paraipaba-CE, Semiarid Brazil. Soil samples were taken from irrigated orchards of banana (Musa ssp.), cashew (Anacardium ocidentale), guava (Psidium guajava), bullock's heart (Annona reticulata), mango (Mangifera indica), and sapote (Manilkara zapota) in the wetted-bulb and non-irrigated area between the plant rows....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Caatinga forest; Soil organic matter; Soil stratification index.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000200010

Variação de matéria seca e de nutrientes nas folhas e nos frutos, produção de ácido ascórbico e suco, em seis cultivares de citros, durante um ciclo
Provedor de dados: 63
Autores: Haag,H.P.; Gutierrez,L.E.; Dechen,A.R.; Mourão Filho,F.A.A.; Moreira,C.S.
De uma plantação de citros, com os cultivares T. Cravo (Citrus reticulata Blanco), L.Hamlin (Citrus sinensis (L.) Osbeck), T. Murcott (Citrus reticulata Blanco x Citrus sinensis (L.) Osbeck), L. Natal (Citrus sinensis (L.) Osbeck, L. Valencia (Citrus sinensis (L.) Osbeck) e L. Pera (Citrus sinensis (L.) Osbeck), situada na "Fazenda Sete Lagoas", no município de Mogi-Guaçu (22° 22% 46° 56'W.Gr.), em Latossolo Vermelho amarelo, fase arenosa, foram coletados frutos 30 dias após florescimento, até a idade da coleta comercial. No material coletado, foram determinadas a variação da matéria seca, a concentração dos macro e micronutrientes nas folhas adjacentes ao fruto, a extração de macro e micronutríentes pelos frutos, a produção de suco (ml) por fruto e a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: T. Cravo; L. Hamlin; T. Murcott; L. Natal; L. Valencia; L. Pera; Extração de nutrientes; Ácido ascórbico; Suco.
Ano: 1993
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161993000200005

Nota do editor
Provedor de dados: 63
Autores: Reichardt,Klaus.
Tipo: Info:eu-repo/semantics/report
Ano: 1997
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161997000300001

Wheat seedling emergence estimated from seed analysis
Provedor de dados: 63
Autores: Boligon,Alexandra Augusti; Lúcio,Alessandro Dal'Col; Lopes,Sidinei José; Cargnelutti Filho,Alberto; Garcia,Danton Camacho.
There are various vigor tests for the evaluation of seeds physiological quality, however, few studies correlate this tests with plants emergency. This study aimed at identifying wheat (Triticum aestivum L.) seed analysis variables that best predict seedling emergence. Wheat seeds (CEP 30 cultivar) were divided into two batches, one initially subjected to the accelerated ageing process and forming the low-quality batch, and the other, without application of the accelerated ageing process, to compose a high-quality batch. The following seed test variables were evaluated: (i) percentage of normal seedlings in the germination tests, (ii) initial germination counting, (iii) accelerated ageing, (iv) cold test without soil, (v) germination speed index, and (vi)...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Stepwise multiple regression analysis; Path analysis; Factor analysis; Seed quality.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000300010

Screening method of lowland rice genotypes for zinc uptake efficiency
Provedor de dados: 63
Autores: Fageria,Nand Kumar.
Zinc deficiency in crop plants has been recognized as a worldwide nutritional constraint. A greenhouse experiment was conducted with the objective of developing a screening technique to evaluate lowland rice genotypes for zinc use efficiency. Ten lowland (Oryza sativa L.) genotypes were tested at low (0 mg Zn kg-1) and high (10 mg Zn kg-1) zinc levels applied to an Inceptisol. Genotypes differed significantly in grain yield and its components. Based on the grain yield efficiency index, genotypes were classified as efficient and inefficient. The most Zn efficient genotypes were: Metica 1, Epagri 108, CNA 7550, and CNA 8619. The most inefficient genotype was CNA 8319. The moderately efficient genotypes were: Javae, Rio Formoso, CNA 7556, and CNA 7857. The...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Oryza sativa; Zinc deficiency; Yield and yield components.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000300028

Only the B biotype of Bemisia tabaci is present on vegetables in São Paulo State, Brazil
Provedor de dados: 63
Autores: Rocha,Kelly Cristina Gonçales; Marubayashi,Julio Massaharu; Navas-Castillo,Jesús; Yuki,Valdir Atsushi; Wilcken,Carlos Frederico; Pavan,Marcelo Agenor; Krause-Sakate,Renate.
Bemisia tabaci (Genn.) is one of the most important pests in cultivated areas of vegetables and ornamental crops around the world. Based on the mitochondrial cytochrome oxidize I (mtCOI) sequence, there is evidence that B. tabaci should be considered a cryptic species complex of 11 groups containing 24 species. Two of the groups, Middle East-Asia Minor 1 and Mediterranean include biotypes B and Q, respectively. In this study we evaluated the mtCOI sequence of B. tabaci populations collected in sites of the state of São Paulo, Brazil. Using PCR-RFLP with Taq I, a typical biotype B profile was obtained for all specimens. Based on the comparison with mtCOI reference sequences we found four haplotypes all belonging to the Middle East-Asia Minor 1. They...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: RFLP; Cytochrome oxidase I gene; Sequencing; Whiteflies.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000100018

Silicon accumulation and water deficit tolerance in Brachiaria grasses
Provedor de dados: 63
Autores: Melo,Suzana Pereira de; Korndörfer,Gaspar Henrique; Korndörfer,Clotilde Maria; Lana,Regina Maria Quintão; Santana,Denise Garcia de.
The beneficial effects of silicon (Si) fertilization have been observed for several plant species, especially when submitted to stress, either biotic or abiotic. Among the possible reasons for the greater adaptability and resistance of brachiaria grass in areas of low fertility soils in Brazilian savanna, stands its capacity of absorbing and accumulating Si in aerial parts. To evaluate the effect of Si on dry matter yield of Brachiaria decumbens Stapf and Brachiaria brizantha Hochst, grown under two soil moisture regimes, a trial was set up in a completely randomized design factorial scheme (5 × 2 × 2), with five Si rates: (0; 242; 484; 968 and 1,452 kg ha-1), two soil water tensions (60% and 80% of field capacity) and the two brachiaria species. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Calcium silicate; Pasture; Water stress; Soil moisture.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000400022

Longevidade e germinação dos diásporos de Ocotea corymbosa (Meissn.) Mez.
Provedor de dados: 63
Autores: Maluf,Angela M.; Passos,Renata; Bilia,Denise A. C.; Barbedo,Claudio J.
Este trabalho objetivou estudar aspectos da germinação e do armazenamento de diásporos de Ocotea corymbosa (Meissn.) Mez., bem como estimar sua longevidade natural. Os diásporos foram obtidos de árvores da região de Moji-Guaçu, SP, em outubro de 1996. Avaliaram-se a porcentagem de germinação, o teor de água e o vigor dos diásporos, antes e após o armazenamento por 30, 60, 90, 120, 150 dias. Este foi realizado sob duas condições: a) diásporos em sacos de papel, em ambiente de laboratório e b) diásporos em sacos plásticos perfurados, dentro de câmara fria (8 ± 2 oC). Os testes de germinação foram, ainda, realizados sob quatro temperaturas constantes: 20, 25, 30 e 35oC. Os resultados mostraram que diásporos de O. corymbosa apresentam longevidade natural...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Semente; Armazenamento; Teste de germinação.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000100008

Impact of the number of Spodoptera frugiperda egg layers on parasitism by Trichogramma atopovirilia
Provedor de dados: 63
Autores: Beserra,Eduardo Barbosa; Parra,José Roberto Postali.
Egg parasitoids of the genus Trichogramma (Hymenoptera: Trichogrammatidae) can be found in several crops attacking Spodoptera frugiperda (J. E. Smith, 1797) (Lepidoptera: Noctuidae) eggs. It is therefore necessary to demonstrate the capacity of these natural enemies in suppressing populations of the pest to allow them to be used in biological control programs against that species. This work had the objective of evaluating the impact of egg layer distribution in S. frugiperda egg masses on the parasitism capacity of Trichogramma atopovirilia Oatman &amp;amp; Platner, 1983. Masses containing one, two, and three layers were used as treatments, and 1.6 parasitoid per egg of the pest were released. Parasitism percentage differences were observed among the three...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Insecta; Fall armyworm; Egg parasitoid; Biological control.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000200016

Biosolids conditioning and the availability of Cu and Zn for rice
Provedor de dados: 63
Autores: Pires,Adriana Marlene Moreno; Mattiazzo,Maria Emília.
Sewage treatment process is a factor to be considered for biosolid use in agriculture. The greatest sewage treatment facility of São Paulo State (Barueri/SP) altered in the year 2000 of its sludge treatment. The addition of ferric chloride and calcium oxide was substituted by the addition of polymers. This change can modify heavy metal phytoavailability. A green house experiment, using 2 soils treated with biosolids (three with and one without polymers with and without polymers) was performed to evaluate Cu and Zn phytoavailability using rice (Oryza sativa L.) as test plant. Three kilograms of two soils (Haphorthox abd Hapludox) were placed in pots and the equivalent to 50 Mg ha-1 (dry basis) of biosolid was added and incorporated. The statistical design...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sewage sludge; Heavy metal; Phytoavailability; Extractant.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000100024

Qualidade de cultivares de alface produzidos em hidroponia
Provedor de dados: 63
Autores: Ohse,Silvana; Dourado-Neto,Durval; Manfron,Paulo Augusto; Santos,Osmar Souza dos.
O objetivo do presente trabalho foi determinar a composição centesimal de seis cultivares de alface (Aurora, Brisa, Lívia, Mimosa, Regina e Verônica) utilizando quatro soluções nutritivas em Santa Maria, RS. Foi utilizado o delineamento experimental inteiramente casualizado com parcelas subdivididas. O experimento constou de oito bancadas, duas para cada solução nutritiva, sendo que cada bancada continha seis canais, um para cada cultivar. O espaçamento utilizado foi 0,18 m entre canais e 0,25 m entre plantas no canal. A solução Ueda, por ter concentração de nutrientes inicial baixa e por essa não ter sido mantida, apresentou maior produção de massa de matéria seca, valor calórico, teores de extrato etéreo e de fibras, depreciando a qualidade do produto...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lactuca sativa; Hidroponia; Composição centesimal.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000100027

Physicochemical characterization of fertilizers containing concentrated suspensions of CuO, MnCO3 and ZnO
Provedor de dados: 63
Autores: Gomes,Marcos Henrique Feresin; Migliavacca,Rafaela Alenbrant; Otto,Rafael; Carvalho,Hudson Wallace Pereira de.
ABSTRACT: The utilization of insoluble sources of micronutrients as concentrated suspensions (CSs) is increasing in Brazilian agriculture; however, much information regarding the physicochemical characterization of these products is required to demonstrate the absorption behavior by plant leaves. This study aimed to characterize the CSs available on the Brazilian market to support their potential use as foliar fertilizers. We selected five CSs containing Mn, five CSs containing Zn and three CSs containing Cu from five different companies. In each product, the mean particle size was evaluated by dynamic light scattering (DLS), the particle shape and size were evaluated by scanning electron microscopy (SEM), the aggregation degree was determined by the zeta...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Insoluble; Nanomaterials; Foliar fertilization; Nanofertilizer.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000601601

Adubação fosfatada e metais pesados em Latossolo cultivado com arroz
Provedor de dados: 63
Autores: Camargo,Mônica Sartori de; Anjos,Ana Rosa Martins dos; Rossi,Carla; Malavolta,Eurípedes.
A avaliação da contaminação por metais pesados contidos nos fertilizantes tem atraído a atenção devido a um eventual efeito no ambiente. O objetivo do trabalho foi estudar a absorção de metais pesados presentes nos adubos fosfatados pelo arroz, utilizando-se uma metodologia de extração seqüencial passível de ser adaptada à análise de rotina. O delineamento experimental foi em blocos casualizados e utilizaram-se quatro fontes de P (superfosfato triplo, termofosfato magnesiano e fosfatos naturais da Carolina do Norte e de Arad) em três doses (50, 100 e 200 mg dm-3). Foram cultivadas plantas de arroz após o cultivo de Brachiaria decumbens e Centrosema pubescens em Latossolo Vermelho-Amarelo distrófico, em condições de casa-de-vegetação. A transferência de...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Extratores; Fósforo; Fertilizantes.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000300022

Nitrogen and sulphur in Marandu grass: relationship between supply and concentration in leaf tissues
Provedor de dados: 63
Autores: Batista,Karina; Monteiro,Francisco Antonio.
In order to better assess the nutritional status of forage grasses there has been an increasing interest in studying the nutrient concentrations present in different parts of plant shoot. The aim of this work was to evaluate the nitrogen and sulphur concentrations in leaf tissues of Brachiaria brizantha cv. Marandu grown in nutrient solutions with combined rates of both nitrogen and sulphur. An experiment was conducted in a greenhouse during the Spring season in Piracicaba-SP, Brazil, using ground quartz as substrate. A fractionated 5² factorial design was used, with 13 combinations of nitrogen and sulphur rates in the solutions, in mg L-1, as follows: 14 and 3.2; 14 and 32; 14 and 80; 126 and 12.8; 126 and 64; 210 and 3.2; 210 and 32; 210 and 80; 336 and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brachiaria brizantha; Nitrogen concentration; Sulphur concentration; N:S ratio; Leaf diagnosis.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000100007

Grãos de soja como fonte de urease na amonização do bagaço de cana-de-açúcar com uréia
Provedor de dados: 63
Autores: Sarmento,Patrícia; Garcia,Rasmo; Pires,Aureliano José Vieira; Nascimento,Andréia Santos.
A urease é a enzima responsável pela hidrólise da uréia em amônia. A utilização de fonte de urease no tratamento de bagaço de cana-de-açúcar com uréia pode melhorar o processo da decomposição da uréia em amônia, beneficiando o tratamento de amonização e, conseqüentemente, o valor nutritivo do material. O objetivo do trabalho foi avaliar o efeito de níveis de soja crua, como fonte de urease, na amonização do bagaço de cana através da uréia. Utilizaram-se quatro níveis de soja crua (0; 2,5; 3,75; e 7,5% da matéria seca) em bagaço de cana-de-açúcar tratado com 7,5% de uréia (da matéria seca), armazenados por um período de 96 dias, em sacos de polietileno com capacidade de 50 litros. Foi utilizado o delineamento inteiramente casualizado com quatro níveis de...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amonização; Bagaço de cana-de-açúcar; Valor nutritivo; Urease; Uréia.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000200002

Extrato metanólico da amêndoa da semente de nim e a mortalidade de ovos e lagartas da traça-do-tomateiro
Provedor de dados: 63
Autores: Trindade,Roseane Cristina Prédes; Marques,Irene Maria Ramos; Xavier,Haroudo Satiro; Oliveira,José Vargas de.
Estudou-se o efeito tóxico do extrato metanólico da amêndoa da semente de nim, obtido pelo aparelho de Soxhlet, na mortalidade de ovos e lagartas de Tuta absoluta (Meyrick) (Lepidoptera: Gelechiidae). Para constatação do efeito ovicida, ovos com 24 horas da oviposição foram contados e pulverizados com extrato nas concentrações 1000; 500; 250; 125 e 62,5 mg L-1. As testemunhas foram pulverizadas com água e metanol. O experimento foi mantido, em laboratório, a 25 ± 2°C; UR de 50 ± 10% e fotofase de 12 h. O período de incubação, para todos os tratamentos inclusive as testemunhas, foi em média de quatro dias, sendo que o extrato não afetou a viabilidade dos ovos, embora os valores tenham variado de 51,7% a 80,6%. Lagartas recém-eclodidas foram colocadas em...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Tuta absoluta; Planta inseticida; Inseticida natural; Nim; Tomate.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000300006

Soil erosion fragility assessment using an impact model and geographic information system
Provedor de dados: 63
Autores: Jorge,Luiz Alberto Blanco.
A study was taken in a 1566 ha watershed situated in the Capivara River basin, municipality of Botucatu, São Paulo State, Brazil. This environment is fragile and can be subjected to different forms of negative impacts, among them soil erosion by water. The main objective of the research was to develop a methodology for the assessment of soil erosion fragility at the various different watershed positions, using the geographic information system ILWIS version 3.3 for Windows. An impact model was created to generate the soil's erosion fragility plan, based on four indicators of fragility to water erosion: land use and cover, slope, percentage of soil fine sand and accumulated water flow. Thematic plans were generated in a geographic information system (GIS)...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Water flow; Hydric erosion; Analytical hierarchy process.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000500011

Modelling air temperature for the state of São Paulo, Brazil
Provedor de dados: 63
Autores: Rodríguez-Lado,Luis; Sparovek,Gerd; Vidal-Torrado,Pablo; Dourado-Neto,Durval; Macías-Vázquez,Felipe.
Spatial modelling of air temperature (maximum, mean and minimum) of the State of São Paulo (Brazil) was calculated by multiple regression analysis and ordinary kriging. Climatic data (mean values of five or more years) were obtained from 256 meteorological stations distributed uniformly over the State. The correlation between the climatic dependent variables, with latitude and altitude as independent variables was significant and could explain most of the spatial variability. The coefficients of determination (P &lt; 0.05) varied in the range of 0.924 and 0.953, showing that multiple regression analysis is an accurate method for the modelling of air temperature for the State of São Paulo. Finally, these regression equations were used together with the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: DEM; GIS; Multiple regression analysis; Kriging; Climate modelling.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000500002

Rhipsalis grandiflora Haw. (Cactaceae) propagation by setem cuttings
Provedor de dados: 63
Autores: Stancato,Giulio Cesare; Aguiar,Francismar Francisco Alves; Kanashiro,Shoey; Tavares,Armando Reis; Catharino,Eduardo Luís Martins; Silveira,Rosiris Bergemann de Aguiar.
The genus Rhipsalis is being cultivated as a potted plant since the view of the pendant branches with coloured flowers and fruit is very appreciated. Considering that there is no information about the production of rooted propagules of these species, the goal of this work was to evaluate the development of stem cuttings, stimulated by the application of plant growth regulators. The indolebutyric acid (IBA) was tested at 0; 4.07; 5.81, and 11.63 mmol L-1 and the naphthaleneacetic acid (NAA) at 0; 4.53; 6.47, and 12.94 mmol L-1 for their activity in promoting roots on apical stem segments of Rhipsalis grandiflora Raw. The base of stem cuttings was dipped into auxin solutions mixed with talc and each one was partially embedded in fir bark (Pinus sp) and fern...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Rhipsalidinae; Articles; Plant growth regulators.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000400007

Fertilização foliar de nitrogênio para laranjeira em estágio de formação
Provedor de dados: 63
Autores: Boaretto,Antonio Enedi; Schiavinato Neto,Plácido; Muraoka,Takashi; Oliveira,Mauro Wagner; Trivelin,Paulo César Ochezue.
Laranjeiras em estágio de formação receberam adubação foliar com uréia (15N). As folhas absorveram, nas 48 horas após a adubação foliar, 52% do N aplicado. Em relação ao N aplicado nas folhas das mudas, 38, 39, 23 e 15% foram recuperados nas plantas coletadas aos 75, 120, 180 e 360 dias após o transplante para os vasos, respectivamente. A adubação foliar das mudas não teve efeitos significativos no peso de matéria seca e no acúmulo de N durante o primeiro ano após o transplante.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Adubação foliar; 15N; Citrus; Uréia.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000300015

Residual recovery and yield performance of nitrogen fertilizer applied at sugarcane planting
Provedor de dados: 63
Autores: Franco,Henrique Coutinho Junqueira; Otto,Rafael; Vitti,André Cesar; Faroni,Carlos Eduardo; Oliveira,Emídio Cantídio de Almeida; Fortes,Caio; Ferreira,Danilo Alves; Kölln,Oriel Tiago; Garside,Alan Leslie; Trivelin,Paulo Cesar Ocheuze.
ABSTRACTThe low effectiveness of nitrogen fertilizer (N) is a substantial concern that threatens global sugarcane production. The aim of the research reported in this paper was to assess the residual effect of N-fertilizer applied at sugarcane planting over four crop seasons in relation to sugarcane crop yield. Toward this end three field experiments were established in the state of São Paulo, Brazil, during February of 2005 and July of 2009, in a randomized block design with four treatments: 0, 40, 80 and 120 kg ha−1 of N applied as urea during sugarcane planting. Within each plot, a microplot was established to which 15N-labeled urea was applied. The application of N at planting increased plant cane yield in two of the three sites and sucrose content at...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Saccharum; Urea; Nitrogen fertilization; Isotopic technique.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162015000600528

Soil water content temporal-spatial variability of the surface layer of a Loess Plateau hillside in China
Provedor de dados: 63
Autores: Hu,Wei; Shao,Ming An; Wang,Quan Jiu; Reichardt,Klaus.
Surface soil moisture exhibits an important variability in terms of spatial and temporal domains, which may result in critical uncertainties for agricultural water management. The purposes of this study were (i) to characterize the temporal dynamics and stability of the spatial variability of the surface 0-6 cm soil water content θon a hill-slope; (ii) to investigate issues related to soil moisture conditions including dominating factors on soil moisture and to the estimation of the mean θ. During a period of more than one month θwas measured on thirteen days by Frequency Domain Reflectometry using a 10 x 10 m grid of measurement points covering a 60 x 280 m domain within a hill-slope of the Loess Plateau in China. Soil water content exhibited a moderate...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Surface soil moisture; Coefficient of variation; Correlation length; Temporal stability.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000300008

Risks associated with a double-cropping production system - a case study in southern Brazil
Provedor de dados: 63
Autores: Osaki,Mauro; Alves,Lucilio Rogerio Aparecido; Lima,Fabio Francisco; Ribeiro,Renato Garcia; Barros,Geraldo Sant'Ana de Camargo.
ABSTRACT: This study assessed the risk exposure of the production system of a typical farm in southern Brazil. Five possible production systems were analyzed, combining three crops (soybeans, corn seasons and wheat) in different crop-year combinations, for example: “Summer soybeans followed by corn” and “Autumn corn followed by winter wheat”. Five different production systems were created based on the intensity of land use for each of the crops. Primary data were collected from a typical farm in the producing region over eight seasons (2006/07 to 2013/14). The Monte Carlo simulation technique was used to evaluate negative Net Operating Revenue (NOR) risk. The results showed that the production system with soybean and first season corn had a higher NOR and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Monte Carlo simulation; Risk analysis; Farm risk.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162019001200130

Performance of Holstein calves having free access to milk and dosed with Megasphaera elsdenii
Provedor de dados: 63
Autores: Muya,Mukengela Claude; Erasmus,Lourens Johannes; Miller,Kevin; Aperce,Celine; Nherera,Florence Veronica; Moshidi,Portia Mamothaladi.
ABSTRACT Megasphaera elsdenii converts lactate and glucose into butyrate, the main volatile fatty acid responsible of papillae development and may benefit calf performance. Twenty-six Holstein calves (BW = 34.5 ± 1.65 kg) were randomly assigned at birth to a control group (Meg0) and a group that received an oral dose of M. elsdenii NCIMB 41125 at 14 d of age (Meg14). Calves received colostrum for the first 3 d followed by free choice access to whole milk until weaning at 56 d. From d 4 onward, starter and water were offered ad libitum. Intakes were measured daily and body weights (BW) weekly. Blood samples were collected on day 7, 21, 28, 42, and 56 for β-hydroxybutyrate (BHBA) analysis. Performance was measured for an additional 14 d post-weaning....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Beta-hydroxybutyrate; Rumen development; Weaning; Probiotics.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162017000300189

Fermentation, losses, and aerobic stability of sugarcane silages treated with chemical or bacterial additives
Provedor de dados: 63
Autores: Pedroso,André de Faria; Nussio,Luiz Gustavo; Loures,Daniele Rebouças Santana; Paziani,Solidete de Fátima; Ribeiro,José Leonardo; Mari,Lucas José; Zopollatto,Maity; Schmidt,Patrick; Mattos,Wilson Roberto Soares; Horii,Jorge.
Utilization of sugarcane Saccharum officinarum L. silage is increasing in Brazil but intensive ethanol production during fermentation reduces forage quality. This experiment aimed to evaluate the effects of additives on fermentation and aerobic stability of sugarcane silages produced in minisilos. Treatments were (fresh basis): untreated silage (control), urea (5.0 g kg-1), sodium benzoate (1.0 g kg-1), potassium sorbate (0.3 g kg-1), Lactobacillus plantarum (1 x 10(6) cfu g-1), and Lactobacillus buchneri (3.64 x 10(5) cfu g-1). At the 94th day after ensilage, ethanol concentration was lower in urea, benzoate, sorbate and L. buchneri supplemented silages and higher in L. plantarum inoculated silage, as compared to control. Urea and benzoate treated silages...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lactobacillus buchneri; Lactobacillus plantarum; Ethanol; Benzoate; Sorbate.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000600004

Temporal profiles of vegetation indices for characterizing grazing intensity on natural grasslands in Pampa biome
Provedor de dados: 63
Autores: Junges,Amanda Heemann; Bremm,Carolina; Fontana,Denise Cybis; Oliveira,Carlos Alberto Oliveira de; Schaparini,Laura Pigatto; Carvalho,Paulo César de Faccio.
ABSTRACT The Pampa biome is an important ecosystem in Brazil that is highly relevant to livestock production. The objective of this study was to analyze the potential use of vegetation indices to discriminate grazing intensities on natural grasslands in the Pampa biome. Moderate Resolution Imaging Spectroradiometer (MODIS) Normalized Difference Vegetation Index (NDVI) and Enhanced Vegetation Index (EVI) images from Jan to Dec, 2000 to 2013 series, were analyzed for natural grassland experimental units managed under high (forage allowance of 5 ± 2 % live weight – LW), moderate (13 ± 5 % LW) and low grazing intensity (19 ± 7 % LW). Regardless of intensity, the temporal profiles showed lower NDVI and EVI during winter, increased values in spring because of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: MODIS; NDVI; EVI; Green biomass; Stocking rate.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000400332

Calcário e escória de siderurgia avaliados por análise foliar, acúmulo, e exportação de macronutrientes em cana-de-açúcar
Provedor de dados: 63
Autores: Prado,Renato de Mello; Fernandes,Francisco Maximino; Natale,William.
A opção de uso de materiais corretivos alternativos como as escórias de siderurgia, pode influenciar na absorção de nutrientes pela planta e, consequentemente, na diagnose foliar, acúmulo e exportação de nutrientes. Com o objetivo de estudar o efeito da aplicação de doses de escória de siderurgia e de calcário na absorção de macronutrientes pela cana-de-açúcar (variedade SP80-1842), foi instalado em janeiro de 1998, em Ituverava-SP, um experimento de campo. Aplicou-se escória de siderurgia e calcário, em quatro doses equivalentes 0; 1,23; 2,52 e 3,80 t ha-1 de CaCO3, em um Latossolo Vermelho-Amarelo distrófico, em pré-plantio na cana-planta. Determinaram-se, além da produção de colmos, as concentrações de macronutrientes na folha +3 da cana-planta e da...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Saccharum sp.; Resíduo siderúrgico; Calagem; Nutrição; Extração.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000100019

Assistência de ar na deposição e perdas de produtos fitossanitários em pulverizações na cultura da soja
Provedor de dados: 63
Autores: Bauer,Fernando César; Raetano,Carlos Gilberto.
Com o objetivo de se comparar a deposição e as perdas em pulverizações na cultura da soja dois pulverizadores tratorizados de barra sendo um convencional (Condor M12-Jacto) e outro com assistência de ar junto a barra de pulverização (Columbia Vortex-Jacto) foram calibrados para aplicar 100 L ha-1, respectivamente das soluções de NaCl e KCl a 2% (p/v) à pressão de 207 kPa (30 lbf pol-2)e velocidade de 6 km h-1. Ambos os equipamentos utilizaram bicos de jato plano tipo API 110-1,5 espaçados a 0,5 m trabalhando a 0,4 m acima da cultura. A avaliação da deposição deu-se em folhas das partes superior, média e inferior das plantas e as perdas para o solo em alvos artificiais (placas de fórmica) distribuídos no interior da cultura de soja. Além desse alvo...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycine max; Pulverizador tratorizado.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000200012

Ruminal methane emission by dairy cattle in Southeast Brazil
Provedor de dados: 63
Autores: Pedreira,Márcio dos Santos; Primavesi,Odo; Lima,Magda Aparecida; Frighetto,Rosa; Oliveira,Simone Gisele de; Berchielli,Telma Teresinha.
Ruminal gases, particularly methane, generated during the fermentative process in rumen, represent a partial loss of feed energy and are also pointed to as an important factors in greenhouse effect. This study aimed at quantifying methane (CH4) emission rates from lactating and dry cows and heifers, 24 month-old in average, on pasture under Southeast Brazil tropical conditions, using the tracer gas technique, sulphur hexafluoride (SF6), four animals per category, distributed in four blocks. Measurements were performed in February and June, 2002, with Holstein and Brazilian Dairy Crossbred (Holstein ¾ x Gir (Zebu) ¼), maintained on fertilized Tanzania-grass (Panicum maximum Jacq. cv. Tanzania) and fertilized Brachiaria-grass (Brachiaria decumbens cv....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Feeding; Genetical group; Sulphur hexafluoride; Tropical pastures.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000600004

Adding guarana powder to medfly diets: an alternative for improving the Sterile Insect Technique
Provedor de dados: 63
Autores: Aquino,Jamile Câmara de; Souza,Cassius Fabian Costa; Santos,Jânio Rodrigo de Jesus; Joachim-Bravo,Iara Sordi.
ABSTRACT Ceratitis capitata (medfly) is a globally important horticultural pest that can be controlled using the sterile insect technique (SIT), but the success of SIT depends on the sexual performance of mass-reared males when released into the field. We added “guarana” (Paullinia cupana) powder (derived from an Amazonian fruit that is considered to be a stimulant with aphrodisiac effects, capable of improving human physical stamina) to the diets of adult male medflies to determine whether it increased their sexual performance. The basic diet of a protein extract + sucrose (1:3) was enriched with guarana powder (3 % on a volume basis). Experiments examining sexual competitiveness were performed using lab-reared males fed with the enriched diet vs....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ceratitis capitata; Paullinia cupana; Tephritidae; Artificial diet.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000300294

Chlorophyll a fluorescence and leaf temperature are early indicators of oil palm diseases
Provedor de dados: 63
Autores: Aucique-Perez,Carlos Eduardo; Daza,Edison Steve; Ávila-Diazgranados,Rodrigo Andrés; Romero,Hernán Mauricio.
ABSTRACT Bud rot (BR) caused by Phytophthora palmivora and lethal wilt (LW) whose causal agent is unknown, are two diseases currently posing a threat to the oil palm ( Elaeis guineensis . Jacq) industry. BR, first reported in 1964, has destroyed more than 85,000 ha. LW, first reported in 1994 in the Llanos Orientales in Colombia, has destroyed more than 5,000 ha. Chlorophyll a fluorescence is useful as a provider of information about the efficiency of the photosynthetic process when plants are subjected to biotic or abiotic stresses. Oil palms affected by BR and LW showed anomalies in the photosynthetic system, manifested by reductions in Fv / F  M and ΦPSII. Changes in ΦPSII, variable fluorescence yield ( Fv ) and maximum fluorescence in light-adapted...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Photosystem II; PSII quantum efficiency; Plant-Pathogen Interaction; Severity.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000201201

Climatic signal in a radial growth of Canadian and Maximovich poplars in south-western Poland
Provedor de dados: 63
Autores: Ziemiańska,Monika; Kalbarczyk,Robert; Chen,Ji-Ren; Dobrzańska,Joanna.
ABSTRACT: The main goal set by researchers in this article was to gather knowledge on the structure of the basic biometric features of tree-rings of two species of poplars, belonging to different sections of Aegeiros – Populus xcanadensis and Tacamahaca – Populus maximowiczii, and to define and understand the correlation between weather and annual increment. A supplementary objective of the article was to determine pointer years of species found in individual populations. Our research used the standard methodology applied in dendroclimatology. In the analysis of correlation of the tree species studied, stronger statistically significant relationships were obtained in terms of precipitation-increment compared to temperature-increment. The annual increment...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Populus xcanadensis; Populus maximowiczii; Dendroclimatology; Synchronisation of tree-ring widths; Pointer years.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000501001

Weed supression by smother crops and selective herbicides
Provedor de dados: 63
Autores: Severino,Francisco José; Christoffoleti,Pedro Jacob.
Using a smother crop is thought to suppress weed density and to add other beneficial effects in sustainable agricultural systems. Weed suppression ought to be considered an essential component of integrated weed management. However, very little is known about the effects of green manure plants on weeds. This study evaluated the influence of three green manure species on weed suppression and selectivity of herbicides. A field experiment was designed to determine the effect of the green manure species Crotalaria juncea, Arachis pintoi and pigeon pea on the weeds Brachiaria decumbens, guineagrass and hairy beggarticks, and on the natural weed infestation in the inter rows area of an avocado orchard. The weed species were suppressed differently by each green...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Integrated weed management; Seed bank dynamics; Phytotoxicity.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000100004

Fontes e doses de nitrogênio e a qualidade dos frutos do mamoeiro
Provedor de dados: 63
Autores: Marinho,Cláudia Sales; Oliveira,Mayron Augusto Borges de; Monnerat,Pedro Henrique; Vianni,Romeu; Maldonado,José Francisco.
O nitrogênio é um dos nutrientes cujo fornecimento está relacionado aos maiores aumentos na produtividade do mamoeiro. Entretanto, seu efeito sobre a qualidade dos frutos nem sempre tem se mostrado favorável. Com o objetivo de verificar o efeito de fontes e doses de nitrogênio sobre algumas características qualitativas dos frutos do mamoeiro (Carica papaya L.) cv. Improved Sunrise Solo Line 72/12, conduziu-se este trabalho. O experimento foi conduzido no campo, sobre um Argissolo Amarelo, no primeiro ano da cultura, em delineamento de blocos casualizados. Foram estudadas três doses de N (10, 20 e 30 g planta-1 mês-1), e duas fontes de nitrogênio (sulfato de amônio e nitrato de amônio). Avaliaram-se o número de frutos por planta, o peso médio dos frutos, o...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Carica papaya; Mamão; Adubação nitrogenada; Qualidade de fruto; Ácido ascórbico.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000200018

Absorção e infiltração de água por raízes de batata-doce, através de ferimentos durante a lavagem
Provedor de dados: 63
Autores: Calbo,Adonai Gimenez; Nery,Amauri Alves.
Raízes intactas e segmentos transversais de batata-doce (Ipomea batatas L. Lam) foram totalmente ou parcialmente imersos em água. Raízes ou segmentos parcialmente imersos ficaram com menos de 10% da superfície externa fora da água, em um suspiro. Nestes ensaios a pressão da atmosfera interna das raízes parcialmente imersas manteve-se apenas alguns milímetros inferior a pressão atmosférica. Nas raízes totalmente imersas a pressão reduziu-se quase linearmente até mais de 1m de coluna de água e depois voltou a aumentar lentamente. Nas raízes intactas ou nos seus segmentos transversais totalmente imersos, houve maior infiltração de água nos volumes intercelulares do que nas raízes ou segmentos parcialmente imersos. Nas raízes intactas praticamente houve apenas...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Ipomea batatas; Volume intercelular; Sanitização; Lavação; Hortaliça.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000300027

Trap and soil monolith sampled edaphic spiders (arachnida: araneae) in Araucaria angustifolia forest
Provedor de dados: 63
Autores: Baretta,Dilmar; Brescovit,Antonio Domingos; Knysak,Irene; Cardoso,Elke Jurandy Bran Nogueira.
Forests with Araucaria angustifolia (Bert.) O. Kuntze trees are endangered in Brazil, and information on the diversity of soil spider families associated to these environments is practically inexistent. The present study was set up to evaluate the abundance and diversity of soil spider families in natural and reforested Araucaria forests, impacted or not by fire, and to identify the most efficient method to collect these organisms. The study was conducted in four areas: native forest with predominance of Araucaria (NF); Araucaria reforestation (R); Araucaria reforestation submitted to an accidental fire (RF); and native grass pasture with native Araucaria and submitted to an intense accidental fire (NPF). Considering both sampling methods (Monolith and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Atlantic Rainforest; Spider fauna; Spider diversity; Bioindicators.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000400008

Genetic parameters for post weaning growth of Nellore cattle using polinomyals and trigonometric functions in random regression models
Provedor de dados: 63
Autores: Macedo,Osmar Jesus; Barbin,Décio; Mourão,Gerson Barreto.
Covariance functions and random regression models have been considered as an alternative for data adjustment, in sequence, stemming from the same animal along time and which presents a structured pattern of covariance. Aiming to evaluate the performance of random regression models based on the Legendre, modified Jacobi and trigonometric functions, data concerning the weights of Nellore breed animals were used from birth to the 800th day of life, in models that assumed direct additive and animal permanent environmental effects coefficients. The Schwarz Bayesian information criterion (BIC) led to the selection of the models Legendre of order six (ML6), Jacobi of order five (MJ5) and trigonometric of order six (MT6), the ML6 model presenting the lowest BIC....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Additive variance; Heritability; Jacobi; Legendre; Longitudinal data.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000400014

Carboidratos não estruturais e acúmulo de forragem em pastagens de Cynodon spp. sob lotação contínua
Provedor de dados: 63
Autores: Carvalho,Carlos Augusto Brandão de; Silva,Sila Carneiro da; Sbrissia,André Fischer; Fagundes,Jaílson Lara; Carnevalli,Roberta Aparecida; Pinto,Luiz Felipe de Moura; Pedreira,Carlos Guilherme Silveira.
Reservas orgânicas são compostos capazes de determinar o vigor e a velocidade da rebrota de plantas forrageiras influenciando sua persistência na pastagem. Dentre os compostos constituintes das reservas orgânicas estão os carboidratos não estruturais (CNE). Os teores e a quantidade de CNE foram avaliados em amostras de pastagens de 'Tifton-85', 'Florakirk' e 'Coastcross', estabelecidas em Nitossolo Vermelho eutroférrico, durante as estações de inverno, primavera e verão. Os tratamentos corresponderam a quatro situações de "steady state" do relvado, caracterizadas por alturas de pasto de 5, 10, 15 e 20 cm mantidas por ovinos sob regime de lotação contínua. O delineamento experimental foi em blocos completos casualizados, com um arranjo de parcelas...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cynodon; Carboidratos de reserva; Teor; Raízes; Base do colmo.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000400003

Condições de conservação pós-colheita de frutos de pimentão (Capsicum annum L.)
Provedor de dados: 63
Autores: Barros,J.C. da S.M. de; Goes,Á. de; Minam,K.
Com o objetivo de verificar a conservação de frutos de pimentão, foi estudada a utilização de dois tipos de embalagem e um seqüestrador de etileno, em condições ambientais e em geladeira. As avaliações foram realizadas a cada cinco dias, obtendo-se as seguintes conclusões: a melhor temperatura para conservação de pimentões situa-se entre 7 e 9°C; o armazenamento de pimentões em bandejas envolvidas com filme de PVC, constitui-se na melhor alternativa para sua conservação, naquela faixa de temperatura. O permanganato de potássio, colocado em cápsulas perfuradas no interior das embalagens, não apresentou efeito evidente como absorvente de etileno. Após 30 dias, foram verificadas perdas de frutos por senescência e/ou pela incidência de doenças.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Embalagens; Temperatura; Conservação pós-colheita; Pimentão.
Ano: 1994
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000200024

Nutrient digestibility and changes in feeding behavior of cattle fed cottonseed and vitamin E
Provedor de dados: 63
Autores: Nogueira,Ricardo Galbiatti Sandoval; Perna Junior,Flavio; Pereira,Angélica Simone Cravo; Rodrigues,Paulo Henrique Mazza.
ABSTRACT: High lipid concentration in ruminant diets often harms nutrient digestibility and feed intake; thus, a protected lipid and antioxidant source can be considered as an alternative for improving diet energy without putting animal production at a disadvantage. The aim of this study was to evaluate the dry matter intake (DMI), nutrient digestibility and feeding behavior of cattle fed cottonseed and vitamin E. Six cannulated cows, non-pregnant, non-lactating were distributed in a replicated 3 × 3 Latin Square design. Feed was offered ad libitum twice daily. Treatments were: 1) Control, 2) CS: 30 % cottonseed included; and 3) CSVitE: 30 % cottonseed plus 500 IU VitE included. Data were analyzed by SAS (Statistical Analysis System, v.9.3) and the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antioxidant; Oilseed; Ruminant.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162019001200112

Stock indexing and Potato virus Y elimination from potato plants cultivated in vitro
Provedor de dados: 63
Autores: Nascimento,Luciana Cordeiro; Pio-Ribeiro,Gilvan; Willadino,Lilia; Andrade,Genira Pereira.
Potato cultivars (Solanum tuberosum L.) have shown degeneration or run out caused by viruses after several cycles of propagation using seed tubers from commercial fields. This work reports the occurrence of single and mixed infections of four potato viruses in Paraíba-Brazil and presents a method for Potato virus Y (PVY) elimination, by using thermo-and chemotherapies. Plants of potato cv. Baraka were tested by direct antigen coating ELISA. Antisera against PVY, Potato virus X (PVX), Potato virus S (PVS), and Potato leafroll virus (PLRV) were used. Materials with positive reaction to PVY were treated for virus elimination. Single node cuttings (1.0 cm length) were excised and inoculated in Murashige &amp;amp; Skoog (MS) medium, supplemented with 1.0 mg L-1...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Solanum tuberosum; Virus-free clones; Thermotherapy; Chemotherapy.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000300017

Métodos de determinação da área basal de uma pastagem de capim-elefante
Provedor de dados: 63
Autores: Martha Júnior,Geraldo Bueno; Corsi,Moacyr; Maule,Rodrigo Fernando; Trivelin,Paulo Cesar Ocheuze; Rovari,Ricardo; Passoni Júnior,João Carlos.
Avaliou-se quantitativamente a área basal de uma pastagem de capim-elefante (Pennisetum purpureum, Schum.) cv. 'Napier' através de três métodos, designados como: trena (T), quadrado (Q) e fotografia (F). A avaliação foi efetuada numa área de 1.800 m2, onde realizaram-se 10 amostragens para cada um dos métodos. A porcentagem de área basal média dos três métodos testados foi de 44 %, sendo que as comparações entre T e Q e Q e F não diferiram estatisticamente (P&amp;gt;0,05). A porcentagem de área basal determinada pelo método T (47,6 %) foi superior (P&amp;lt;0,05) ao método F (41,7 %) em 6 unidades percentuais.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pennisetum purpureum; Metodologia; Área basal.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000300019

Ractopamine supplementation improves leanness and carcass yield, minimally affecting pork quality in immunocastrated pigs
Provedor de dados: 63
Autores: Costa,Osmar Antonio Dalla; Feddern,Vivian; Athayde,Natalia Bortoleto; Manzke,Naiana Einhardt; Roça,Roberto de Oliveira; Lopes,Letícia dos Santos; Lima,Gustavo Julio Mello Monteiro de.
ABSTRACT: This study was carried out to determine the combining effects of feeding up to 15 mg kg−1 ractopamine (RAC) to physically castrated (PC) pigs or those injected with an anti-GnRF vaccine (IC), on growth performance during suckling, weaning, growing and finishing phases. Out of a total of 1,160 male piglets, 50 % were surgically castrated at age 7, while 50 % underwent immunization against GnRF on the 103rd and 136th day of life. A completely randomized design, with two treatments (PC and IC), was used from the 1st until the 60th day of life. Afterwards, 792 animals, PC and IC, selected according to overall average weight (23.3 ± 0.69 kg) were allotted based on a completely randomized block design with a 2 × 4 factorial arrangement of treatments...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Β-agonists; Cutting yield; Lean meat; Stress parameters.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162018000300197

Profundidade de amostragem do solo para avaliação do enxofre disponível em pomar de limão siciliano (Citrus limon Burm.)
Provedor de dados: 63
Autores: Prochnow,L.I.; Boaretto,A.E.
Em um Latossolo Vermelho Escuro, textura média, no qual foram estabelecidos diferentes teores de enxofre, através da aplicação de doses crescentes de gesso agrícola (0, 1, 2 e 4 t/ha), estudou-se a profundidade adequada para coleta de amostras de terra para avaliação do S-SO4-2 "disponível" para o limão siciliano (Citrus limon Burm.) enxertado sobre porta enxerto Volkameriano. As quantidades de sulfato no solo, extraídas pelo NH4OAc 0,5 M em HOAc 0,25 M, foram determinadas aos 6, 12 e 24 meses após a aplicação do produto nas seguintes profundidades: 0-5, 5-10, 10-20, 20-40, 40-80 e 80-120 cm. As quantidades de enxofre nas folhas do limão siciliano foram também determinadas na mesma época. Os dados obtidos e os estudos de correlação que se seguiram...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Disponibilidade de enxofre; Gesso agrícola; Profundidade de amostragem; Limão siciliano; Citrus limon.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000100018

Analysis of NH3-N Slow Release systems for fiber digestibility of low-quality forage: in vitro approach
Provedor de dados: 63
Autores: Cruz,Camila Conceição Tomé da; Pereira,Elaine Inácio; Sato,Patrícia Suemi; Guimarães,Gelton Geraldo Fernandes; Souza,Gilberto Batista de; Bernardi,Alberto Carlos de Campos; Ribeiro,Caue.
ABSTRACT: Urea is a common non-protein supplement used in ruminant feed; however, excessive consumption may lead to poisoning by NH3. Although the slow release of urea into the rumen has shown to be an essential aspect for ruminant feed, to date only a few studies have addressed this matter. In this study we examined the influence of five different NH3-N slow release systems based on clay-urea nanocomposites on the fiber digestibility of low-quality forage (sugarcane straw) in vitro. Physical properties of nanocomposites were evaluated and their effects on digestibility were tested in vitro using pristine urea as a positive control (level of 1 % of DM of sugarcane straw sample) and sugarcane (with no additives) as a negative control. Ammonia release and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Slow-release urea; Ruminants feed; Non-protein nitrogen.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000500401

Lipid abundance and composition of a humic Oxisol as a function of land use
Provedor de dados: 63
Autores: Assis,Cristiane Pereira de; González-Vila,Francisco Javier; Jucksch,Ivo; González-Pérez,Jose Antonio; Neves,Júlio César Lima; Lani,João Luis; Mendonça,Eduardo de Sá.
Soil organic matter of a humic Oxisol has been characterized by analyzing litter and soil lipid composition under vegetal covers (coffee, pasture and fragment of native forest). Soil and litter samples were collected from each site at two depths (0-10 and 60-100 cm). Lipid composition was determined by gas chromatography-mass spectrometry (CG-MS). In the solvent extracts of the soil lipids, even-numbered n-alkanoic acids in the range of C16-C32 indicate a soil organic matter input from higher plant waxes. The major compound classes in both the soil and the litter included saturated n-alkanoic acids, with average values in the total spectrum of 58 and 53%, respectively Clear differences in lipid composition were found between the topsoil and subsurface....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil and litter lipid; Soil management; Tropical soil; Grass; Coffee.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000200014

Conservação do leite de castanha-do-pará
Provedor de dados: 63
Autores: Cardarelli,Haíssa Roberta; Oliveira,Antonio Joaquim de.
Com o objetivo de avaliar a conservação do extrato fluido da amêndoa de castanha-do-pará (conhecido como leite de castanha), executou-se a pasteurização com e sem adição de conservantes químicos e armazenou-se o produto sob refrigeração. Monitorou-se o produto, ao longo de um período de 180 dias de armazenamento, através de análises microbiológicas e das análises físico-químicas de acidez titulável e de pH. Os tratamentos que receberam conservantes químicos foram os mais estáveis microbiologicamente e obtiveram pH e acidez titulável mais equilibrados. A ausência de coliformes totais e fecais demonstrou a eficiência da pasteurização. Concluiu-se que a pasteurização só é um método viável de conservação do leite de castanha se associada à adição de...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bertholletia excelsa; Conservação; Castanha-do-pará; Leite de castanha.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000400004

Teste de lixiviação de potássio para avaliação do vigor de sementes de soja [Glycine max (L.)Merril]
Provedor de dados: 63
Autores: Dias,D.C.F.S.; Marcos F,J.; Carmelo,Q.A.C.
O presente trabalho teve como objetivo principal investigar a possibilidade de se obter indicações rápidas sobre a qualidade fisiológica de sementes de soja através do teste de lixiviação de potássio, cuja eficiência foi avaliada comparativamente as informações fornecidas por outros métodos considerados adequados para a determinação do vigor. Para tanto, utilizou-se quatro lotes de sementes de soja dos cultivares IAC-8 e IAC-15 que foram submetidos aos testes de germinação, primeira contagem de germinação, envelhecimento artificial, condutividade elétrica e determinação do grau de umidade. Além destes foram conduzidos estudos de lixiviação de potássio utilizando-se amostras de sementes não danificadas e de sementes fisicamente puras. A quantidade de...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soja; Sementes; Vigor; Lixiviação de potássio; Glycine max.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000300007

Bioactivity of essential oils from Artemisia against Diaphania hyalinata and its selectivity to beneficial insects
Provedor de dados: 63
Autores: Seixas,Paula Tatiana Lopes; Demuner,Antonio Jacinto; Alvarenga,Elson Santiago; Barbosa,Luiz Claudio Almeida; Marques,Ana; Farias,Elizeu de Sá; Picanço,Marcelo Coutinho.
ABSTRACT: The demand for effective insecticides in pest control with low toxicity to the non-target organisms, such as natural enemies and pollinators, is increasing steadily. A good alternative for synthetic insecticides is natural compounds, including essential oils (EO). This work assessed toxicity of essential oils extracted from Artemisia annua, A. absinthium, A. camphorata, A. dracunculus and A. vulgaris against the melonworm Diaphania hyalinata (Linnaeus, 1758) (Lepidoptera: Crambidae) larvae, a pest of Cucurbitaceae, and their selectivity for fire ant Solenopsis saevissima (Smith) (Hymenoptera: Formicidae) and jataí bee Tetragonisca angustula (Latreille) (Meliponinae). The plants were grown in a greenhouse with mineral fertilization and were used...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Solenopsis saevissima; Tetragonisca angustula; Melonworm; Insecticide.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162018000600519

Langstroth hive construction with cement-vermiculite
Provedor de dados: 63
Autores: Lorenzon,Maria Cristina Affonso; Cidreira,Rodolfo Gonçalves; Rodrigues,Edmundo Henrique Ventura; Dornelles,Milton Sérgio; Pereira Jr,Geraldo.
Exfoliated vermiculite is a light-weight and cheap product that, because of its thermal resistance, has become a valuable insulating material. With regard to its use in beekeeping, this research tested whether the box for honey bees constructed with cement-vermiculite mortar (CVM) presents physical characteristics similar to those of wood. The experiment was carried out at Seropédica, RJ, Brazil, for eight months. The cement-vermiculite mortar was compared with a control material (pinewood), in the construction of Langstroth boxes and boards, in a completely randomized design, with respect to thermal control, thermal conductivity and its capacity to absorb and lose water. The production cost for a CVM box was estimated. There were no internal temperature...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Apis mellifera; Mineral; Beekeeping; Insulating material.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000600002

Interações entre Pratylenchus brachyurus e Meloidogynejavanica em soja
Provedor de dados: 63
Autores: Ferraz,L.C.C.B.
Avaliaram-se os efeitos de interações entre Pratylenchus brachyurus e Meloidogynejavanica na soja 'Cristalina', sob condição de telado. Dez tratamentos (testemunha não inoculada; infestações simples de P. brachyurus em três níveis de inóculo; infestações simples de M. javanica em dois níveis de inóculo; e infestações conjuntas das duas espécies em quatro combinações de níveis de inóculo) foram estabelecidos, repetidos cinco vezes e arranjados em blocos casualizados. Após 60 dias das inoculações, determinaram-se os pesos de matéria fresca de raízes e matéria seca da parte aérea das plantas, bem como estimaram-se as populações finais dos nematóides. Observou-se antagonismo entre as duas espécies nas infestações conjuntas, sendo P. brachyurus geralmente a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Interações; Pratylenchus brachyurus; Meloidogynejavanica.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000200017

Estabilidade de uma formulação de Bacillus sphaericus armazenada sob diferentes temperaturas
Provedor de dados: 63
Autores: Alves,Luis Francisco Angeli; Alves,Sérgio Batista; Lopes,Rogério Biaggioni; Augusto,Nílson Toschi.
O objetivo deste trabalho foi avaliar a estabilidade de uma formulação granulada de Bacillus sphaericus à base de sabugo de milho, armazenada em condições ambientais e a 50°C, tendo como comparação, uma suspensão concentrada de esporos e cristais da bactéria. A análise periódica dos materiais armazenados revelaram o efeito protetor da formulação sobre o microrganismo, de forma que ao longo de 12 meses de armazenamento, em condições ambiente, a viabilidade dos esporos foi maior que na suspensão concentrada. Além disso, a atividade inseticida para larvas de Culex quinquefasciatus, avaliada nos criadouros artificiais foi comparável ao patógeno não formulado. Quando mantidos a 50°C, a ação protetora da formulação mostrou-se mais eficiente, sendo que ao final...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Culex quinquefasciatus; Entomopatógeno; Controle microbiano; Culex quinquefasciatus; Entomopathogen; Microbial control.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000100004

Colonização radicular de plantas cultivadas por Ralstonia solanacearum biovares 1, 2 e 3
Provedor de dados: 63
Autores: Bringel,José Magno Martins; Takatsu,Armando; Uesugi,Carlos H.
A murcha bacteriana causada por Ralstonia solanacearum é considerada a principal doença de origem bacteriana no mundo. Centenas de espécies de plantas pertencentes a mais de 50 famílias botânicas têm sido relatadas como hospedeiras. Foi avaliada, em condições de casa de vegetação, a colonização radicular de alface, arroz, cebolinha, ervilha, pepino e soja, por seis isolados de Ralstonia solanacearum (Rs), biovares 1, 2 e 3. Estirpes dos isolados de Rs com resistência múltipla aos antibióticos estreptomicina, rifampicina e cloranfenicol foram utilizadas. A colonização foi avaliada 45 dias após a inoculação, através do plaqueamento de suspensão de trituração em meio de cultura semi-seletivo. A ervilha comportou-se como hospedeira de todos os isolados mas,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Murcha bacteriana; Ecologia.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000300010

Biotic and abiotic factors associated with soil suppressiveness to Rhizoctonia solani
Provedor de dados: 63
Autores: Ghini,Raquel; Morandi,Marcelo Augusto Boechat.
Crop management may modify soil characteristics, and as a consequence, alter incidence of diseases caused by soilborne pathogens. This study evaluated the suppressiveness to R. solani in 59 soil samples from a microbasin. Soil sampling areas included undisturbed forest, pasture and fallow ground areas, annual crops, perennial crops, and ploughed soil. The soil samples were characterized according to abiotic variables (pH; electrical conductivity; organic matter content; N total; P; K; Ca; Mg; Al; H; S; Na; Fe; Mn; Cu; Zn; B; cation exchange capacity; sum of bases and base saturation) and biotic variables (total microbial activity evaluated by the CO2 evolution and fluorescein diacetate hydrolysis; culturable bacterial, fungal, actinomycetes, protozoa,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soilborne pathogen; Soil microorganisms; Biological control; Path analysis; Suppressive soil.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000200007

DISTÚRBIOS FISIOLÓGICOS DA MANGA: EFEITO DA APLICAÇÃO DE Ca EM PULVERIZAÇÃO FOLIAR
Provedor de dados: 63
Autores: Sampaio,Vladimir Rodrigues; Scarpare Filho,João Alexio; Kluge,Ricardo Alfredo.
Na fase de frutificação da mangueira 'Tommy Atkins', foram realizadas sete pulverizações com cloreto de cálcio (0,6 e 1,2%) observando-se intervalo de 2 semanas. Os frutos foram colhidos em duas ocasiões: 16/12/96 (colheita em época normal) e 06/01/97 (colheita tardia). Não houve incremento no conteúdo de cálcio na polpa dos frutos das plantas tratadas em comparação às não tratadas. A incidência de distúrbios fisiológicos foi similar em todos os tratamentos, independente dos conteúdos de nitrogênio e cálcio no mesocarpo dos frutos. As desordens fisiológicas nos frutos aumentaram na colheita tardia.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Manga; Colapso de polpa; Cloreto de cálcio.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000200028

A comparison between Joint Regression Analysis and the Additive Main and Multiplicative Interaction model: the robustness with increasing amounts of missing data
Provedor de dados: 63
Autores: Rodrigues,Paulo Canas; Pereira,Dulce Gamito Santinhos; Mexia,João Tiago.
This paper joins the main properties of joint regression analysis (JRA), a model based on the Finlay-Wilkinson regression to analyse multi-environment trials, and of the additive main effects and multiplicative interaction (AMMI) model. The study compares JRA and AMMI with particular focus on robustness with increasing amounts of randomly selected missing data. The application is made using a data set from a breeding program of durum wheat (Triticum turgidum L., Durum Group) conducted in Portugal. The results of the two models result in similar dominant cultivars (JRA) and winner of mega-environments (AMMI) for the same environments. However, JRA had more stable results with the increase in the incidence rates of missing values.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: AMMI models; Genotype by environment interaction; Joint regression analysis; Missing values; Durum wheat.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000600012

Nutritional diagnosis for eucalypt by DRIS, M-DRIS, and CND
Provedor de dados: 63
Autores: Silva,Gualter Guenther Costa da; Neves,Júlio César Lima; Alvarez V.,Víctor Hugo; Leite,Fernando Palha.
The evaluation of the nutritional status in eucalypt (Eucalyptus grandis W. Hill ex Maid.) forests through vegetal tissue analyses what reflects water and nutrient flows in the system, and represents a complementary tool to soil analysis can be helpful to raise and maintain the forest productivity at high levels. This study compared the use of the Diagnosis and Recommendation Integrated System (DRIS), Modified-DRIS (M-DRIS), and Compositional Nutrient Diagnosis (CND) diagnose methods in eucalypt stands in Central-Eastern Minas Gerais State, Brazil. Data of productivity and of N, P, K, Ca, and Mg leaf contents in 993 Eucalyptus grandis stands aging between 72 and 153 months, planted on six sites in 3 ´ 2 m spacing, were used. The nutritional status was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Eucalyptus grandis; Leaf analysis; Leaf diagnosis; Mineral nutrition.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000500008

Chave analítica para determinação de dez variedades de cana-de-açúcar (Saccharum spp.)
Provedor de dados: 63
Autores: Almeida,M.De; Rochelle,L.A.; Crocomo,O.J.
Utilizando dados obtidos sobre a atividade de isoenzinias de esterase e peroxidase, o teor de proteína total solúvel e o nível de sólidos solúveis (sacarose, grau Brix, bem como parâmetros organográficos de colmo e folhas já publicados), foi possível elaborar uma chave analítica para determinação de 10 variedades de cana-de-açúcar (Saccharum spp.): NA 56-79, IAC 52-150, IAC 64-257, SP 70-1143, SP 71-3146, SP 71-3149. SP 71-1406. SP 71-6163, SP 71-6168 e SP 71-799.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Quimiotaxonomia; Cana-de-açúcar; Organografia; Colmo; Folha; Isoenzimas; Esterase; Peroxidase.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000100004

Genetic linkage map of chicken chromosome 1 from a Brazilian resource population
Provedor de dados: 63
Autores: Nones,Kátia; Ledur,Mônica Corrêa; Ruy,Deborah Clea; Baron,Erica Elias; Moura,Ana Silvia Alves Meira Tavares; Coutinho,Luiz Lehmann.
A genetic map provides insight into genome organization and chromosomal location of markers and genes, and is important for quantitative trait loci (QTL) mapping. The objective of this study was to use a Brazilian resource population to construct a linkage map for chicken chromosome 1. Eighty microsatellite markers were tested and 26 informative markers were typed in an experimental F2 population developed by two generations of crossbreeding between a broiler sire line and a layer line. A total of 649 F2 individuals from seven full-sib families with about 95 F2 offspring each were genotyped. Multi-locus linkage analysis resulted in a chromosome 1 map of 26 ordered markers. Locus order was in general agreement with other published linkage maps, except for...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Microsatellites; Poultry; Mapping.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000100003

Potencial de rizobactérias no controle de Fusarium solani (Mart.) Sacc. em pepino (Cucumis sativum L.)
Provedor de dados: 63
Autores: Melo,I S. de; Valarini,P. J.
Rizobactérias, isoladas da rizosfera de diferentes hospedeiros foram selecionadas in vitro quanto ao antagonismo contra Fusarium solam agente causai da podridão radicular. In vitro, foram selecionadas 18 bactérias isoladas da rizosfera de plantas sadias de pepino e, destas, somente três foram eficientes em inibir consideravelmente o crescimento micelial do patógeno. Dois isolados de Bacillus subtilis e dois de Pseudomonas sp., antagônicos a outros fungos fitopatogênicos foram incluidos nos testes, os quais mostraram-se capazes de antagonizar F. solani. Em condições de casa-de-vegetação, B. subtilis, linhagem 0G, controlou totalmente o patógeno em todos os ensaios realizados. Promoção do crescimento de plantas foi verificada pela inoculação com linhagens 0G...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Rizobactérias; Biocontrole; Fusarium solani; Pepino.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000200020

Ácido Giberélico (GA3) e maturação de frutos das tangerinas 'Mexerica Montenegrina'e 'Poncã'
Provedor de dados: 63
Autores: Marur,Celso Jamil; Stenzel,Neusa Maria Colauto; Rampazzo,Elcio Felix; Scholz,Maria Brígida Santos.
Na região norte do estado do Paraná, Brasil, as tangerinas `Ponkan' (Citrus reticulata) e `Montenegrina' (Citrus deliciosa) geralmente são colhidas em maio e julho, respectivamente. Aplicações de produtos à base de GA3 podem estender o período de produção, permitindo aos produtores programar a colheita e obter melhores preços. Neste trabalho foi estudado o efeito do GA3 sobre a maturação dos frutos de ambas as espécies, nos anos de 1996 e 1997. Os tratamentos constaram de concentrações compreendidas entre 20 e 60 mg L-1 de GA3 aplicadas ao início da mudança de cor dos frutos e quando a coloração alaranjada estava mais avançada. A cada 21 dias a maturação dos frutos foi visualmente avaliada e 6 frutos por parcela foram amostrados para análises do grau Brix...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ácido giberélico; Maturação; Mexerica `Montenegrina'; Tangerina `Poncã'.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000300002

Plot size and experimental unit relationship in exploratory experiments
Provedor de dados: 63
Autores: Oliveira,Sérgio José Ribeiro de; Storck,Lindolfo; Lopes,Sidinei José; Lúcio,Alessandro Dal'Col; Feijó,Sandra; Damo,Henrique Perin.
Quality of field experiments data dependent upon adequate experimental design. This study investigated the relationship between the size of the basic unit for exploratory experiments and the optimum plot size, and the experiment precision with potato crop. Tuber yield of 24 rows, 144 mounds, were used to arrange experimental units of one, two, three, four, six, eight and 12 mounds. Tuber yield data of different mounds were used to arrange plot sizes with different numbers of basic units. The model CV(x)=A/X B was adjusted, in which CV(x) was the coefficient of variation among plots with different numbers of basic units. Optimum plot size was estimated with the modified maximum curvature method of the function CV(x)=A/X B, allowing completely random design....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Solanum tuberosum L.; Experiment arrangements; Quality control; Experimental precision.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000600012

Seed technology at The Ohio State University
Provedor de dados: 63
Autores: Waters Jr.,L.
The present paper shows the development of teaching, research and extension programs in Seed Technology at The Ohio State University.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Seed technology; Training program.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000500002

Horse grazing systems: understory biomass and plant biodiversity of a Pinus radiata stand
Provedor de dados: 63
Autores: Rigueiro-Rodríguez,Antonio; Mouhbi,Rabia; Santiago-Freijanes,José Javier; González-Hernández,María del Pilar; Mosquera-Losada,María Rosa.
Horse grazing systems may affect productivity and biodiversity of understory developed under Pinus radiata D. Don silvopastoral systems, while acting as a tool to reduce the risk of fire. This study compared continuous and rotational grazing systems effect upon biomass, fractions of stem, sprouts, leaves and woody parts of Ulex europaeus L. and alpha (Species Richness, Shannon-Wiener) and beta (Jaccard and Magurran) biodiversity for a period of four years in a P. radiata silvopastoral system. The experiment consisted of a randomized block design of two treatments (continuous and rotational grazing). Biomass, and species abundances were measured - biodiversity metrics were calculated based on these results for a two years of grazing and two years of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Silvopastoral; Species richness; Livestock management; Shrub biomass control; Fires.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162012000100006

Biologia de Tuta absoluta (Meyrick, 1917) em dieta artificial
Provedor de dados: 63
Autores: Mihsfeldt,Laila Herta; Parra,José Roberto Postali.
O presente trabalho teve por objetivo desenvolver uma dieta artificial para a criação da traça-do-tomateiro (Tuta absoluta) sem a dependência do hospedeiro natural (tomateiro). A dieta empregada tem como fontes protéicas germe de trigo, levedura, caseína e farelo de soja, além do feijão, que foi a variável do trabalho. A dieta mais adequada para a criação da traça-do-tomateiro foi o hospedeiro natural, no caso, as folhas de tomateiro ‘Santa Clara’ e, dentre os meios artificiais, o que se mostrou mais promissor foi aquele com feijão Branco acrescido de pó de folha de tomateiro. Este pó de folhas apresentou um efeito fagoestimulante, diminuindo a mortalidade inicial e aumentando a viabilidade total do inseto no meio artificial. O número de ínstares foi...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Tuta absoluta; Dieta artificial; Ínstares; Tomate; Feijão; Dieta natural; Traça-do-tomateiro.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000400002

Potential nutrient-response curves and sufficiency ranges for ‘Prata-Anã’ banana cultivated under two environmental conditions
Provedor de dados: 63
Autores: Rodrigues Filho,Vagner Alves; Neves,Júlio César Lima; Donato,Sérgio Luiz Rodrigues; Guimarães,Bruno Vinícius Castro.
ABSTRACT: Proper plant nutrition is critical to increasing the yield of bananas. The objective was to establish the potential nutrient-response curves and sufficiency ranges using the boundary line approach (BLA) and the method proposed by Kenworthy (MK) to assess the nutritional status of ‘Prata-Anã’ bananas cultivated under two environmental conditions. The study was carried out using a database comprising leaf nutrient concentrations and banana yields grown at Missão Velha, Ceará, and Ponto Novo, Bahia, Brazil. The reference population consisted of high-yielding plants with yields greater than the mean yield plus 0.5 standard deviation. The database was divided into two datasets. One contained 253 leaf analysis results and a reference population with a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Musa spp; AAB; Site condition; Nutritional status; Diagnostic methods.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000701402

Rainfall intensity and Mepiquat Chloride persistence in cotton
Provedor de dados: 63
Autores: Souza,Fábio Suano de; Rosolem,Ciro Antonio.
In some regions where cotton is grown in Brazil rainfall amounts to about 2,000 mm per year, which imposes a great risk for Mepiquat Chloride (MP) to be washed from cotton leaves before being absorbed. The objective of this research was to evaluate the MC persistence when applied on cotton plants submitted to different rain intensities after spraying. The treatments were three MC rates: 0, 15.0 and 30.0 g a.i. ha-1 and four simulated rainfalls, applied 90 minutes after MC spraying: 5, 10, 20 and 40 mm, plus a treatment without rain. Cotton plants of the cv. Delta Opal were grown in 12 L pots filled with an Haplortox. The experimental design was consisted of complete randomized blocks, in a factorial scheme, with four replicates. The evaluated parameters...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Plant growth regulator; Rain washing; Plant height.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000200004

Neural networks for predicting breeding values and genetic gains
Provedor de dados: 63
Autores: Silva,Gabi Nunes; Tomaz,Rafael Simões; Sant'Anna,Isabela de Castro; Nascimento,Moysés; Bhering,Leonardo Lopes; Cruz,Cosme Damião.
Analysis using Artificial Neural Networks has been described as an approach in the decision-making process that, although incipient, has been reported as presenting high potential for use in animal and plant breeding. In this study, we introduce the procedure of using the expanded data set for training the network. Wealso proposed using statistical parameters to estimate the breeding value of genotypes in simulated scenarios, in addition to the mean phenotypic value in a feed-forward back propagation multilayer perceptron network. After evaluating artificial neural network configurations, our results showed its superiority to estimates based on linear models, as well as its applicability in the genetic value prediction process. The results further...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Genetic value; Statistics; Simulation; Artificial intelligence; Training strategy.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162014000600008

Combate experimental ao ácaro da leprose Brevipalpus phoenicis (Geijskes, 1939) em citros
Provedor de dados: 63
Autores: Campos Neto,H.M.; Moura,E.; Passos,H.R.; Ciniglio Neto,F.; Mariconi,F.A.M.; Scarpari Filho,J.A.
Com o objetivo de combater o ácaro Brevipalpus phoenicis (Geijskes), transmissor do vírus da leprose, foi estudada a eficiência de diferentes defensivos químicos. Os tratamentos foram seis, cada um com quatro repetições. A) propargite (0,05&lt;IMG SRC="/img/revistas/sa/v50n2/15x.gif" WIDTH=8 HEIGHT=12&gt; CE 72%) + enxofre (1,0&lt;IMG SRC="/img/revistas/sa/v50n2/15x.gif" WIDTH=8 HEIGHT=12&gt; SC 75%); B) peropal (0,1 kg PM 25%); C) quinometionato (0,05 kg PM 70%) (padrão); D) dicofol + tetradifom (0,2&lt;IMG SRC="/img/revistas/sa/v50n2/15x.gif" WIDTH=8 HEIGHT=12&gt; CE 16% + 6%); E) propargite (0,075&lt;IMG SRC="/img/revistas/sa/v50n2/15x.gif" WIDTH=8 HEIGHT=12&gt; CE 72%); F) testemunha. Cada laranjeira recebeu dez litros de calda numa única aplicação;...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brevipalpus phoenicis; Ácaro da leprose; Citros; Juvenóide; Acaricida.
Ano: 1993
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161993000200015

Editorial
Provedor de dados: 63
Autores: Rodrigues,Ricardo Ribeiro.
Tipo: Info:eu-repo/semantics/other
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000400001

Longitudinal model for categorical data applied in an agriculture experiment about elephant grass
Provedor de dados: 63
Autores: Menarin,Vinícius; Lara,Idemauro Antonio Rodrigues de; Silva,Sila Carneiro da.
ABSTRACT Experiments where the response is a categorical variable are usually carried out in many fields such as agriculture. In addition, in some situations this response has three or more levels without an order between them characterizing a multinomial (nominal) response. Statistical models for scenarios where the observations of a nominal response can be considered independent have an extensive literature, such as the baseline-category logit models. However, situations where this assumption is violated (as in longitudinal studies) require specific models that take into consideration the dependence between observations. In this paper, a fairly new extension of the generalized estimating equations is applied to analyze an experiment carried out to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Type of vegetation; Longitudinal multinomial data; Generalized estimating equations; Local odds ratio.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162017000400265

Establishment and optimization of a hydroponic system for root morphological and nutritional analysis of citrus
Provedor de dados: 63
Autores: Zhou,Gaofeng; Wei,Qingjiang; Li,Bixian; Zeng,Xiaoli; Liu,Guidong.
ABSTRACT The hydroponic growth system is a convenient platform for studying whole plant physiology, especially for root morphological and nutritional analysis. However, we found that most hydroponic systems described in the literature are not suitable for citrus plants. In this study, a hydroponic system for citrus was designed, comprising three principal components: power and time switch, aeration and hydroponic culture. Herein, details of the protocol were described, including equipment setup, seed pregermination and cultivation, together with preparation and transfer of nutrient solution into hydroponics. In order to demonstrate the adaptability of the trifoliate orange plant to our hydroponic system, comparative tests between soil- and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cultivation; Plant nutrition; Trifoliate orange; Root morphology.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000401403

Alumínio e a absorção de cálcio por mudas de pimenta do reino
Provedor de dados: 63
Autores: Veloso,Carlos Alberto Costa; Malavolta,Eurípedes; Muraoka,Takashi; Carvalho,Eduardo Jorge Maklouf.
Um experimento com solução nutritiva foi conduzido em casa de vegetação com o objetivo de verificar os efeitos da nutrição de cálcio na toxicidade de alumínio em mudas de pimenta do reino. Os tratamentos constituíram-se de três concentrações de cálcio (10; 40 e 160 mg L-1) adicionados como CaCl2 em combinação com três concentrações de alumínio (0; 10 e 20 mg L-1) adicionados como AlCl3.6H2O. A solução nutritiva continha as seguintes concentrações dos íons expressos em mg L-1: N-NO3 (80,5); N-NH4 (10,5); P(1,5); K(39,0); Mg(24,0); S-SO4(32,0); B(0,5); Cu(0,06); Fe(5,0); Mn(1,0); Mo(0,03) e Zn(0,10). Os tratamentos com alumínio retardaram o crescimento das mudas de pimenta do reino, induziram sintomas de toxicidade de alumínio na parte aérea e principalmente...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Piper nigrum; Toxicidade de alumínio; Cálcio; Nutrição.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000100023

DESENVOLVIMENTO DA LAGARTA-DA-SOJA  (Anticarsia gemmatalis HÜBNER) EM CULTIVARES DE SOJA COM DIFERENTES DENSIDADES LARVAIS DE CRIAÇÃO
Provedor de dados: 63
Autores: CASTIGLIONI,E.A; VENDRAMIM,J.D.
O trabalho teve por objetivo estudar alguns aspectos biológicos da lagarta-da-soja, Anticarsia gemmatalis Hübner, alimentada com folhas de seis cultivares de soja (Bossier, Planalto, Prata, Santa Rosa, UFV-1 e Viçoja), em duas densidades larvais de criação (um e cinco indivíduos por recipiente), em condições de laboratório. O efeito das cultivares foi variável em função dos aspectos biológicos estudados, não permitindo destacar nenhum material como menos ou mais adequado ao desenvolvimento dessa praga. Na criação individual, verificou-se menor heterogeneidade nos estádios de desenvolvimento do inseto, podendo-se considerar este sistema como mais adequado do que a criação coletiva.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Insecta; Lagarta-da-soja; Resistência de plantas; Biologia; Densidade populacional.
Ano: 1996
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161996000100021

Abscisic acid and ethephon treatments applied to ‘Verdejo’ white grapes affect the quality of wine in different ways
Provedor de dados: 63
Autores: González,Raquel; González,María-Rosa; Martín,Pedro.
ABSTRACT: Exogenous ethephon and abscisic acid (ABA) treatments are used worldwide to improve the coloring of red table grapes, but there is little information about their impact on the quality of white grapes and wines. The aim of this work was to evaluate the effects of exogenous ethephon and ABA applications at veraison on the composition of ‘Verdejo’ white grapes, and on the quality of their wines. To attain this objective, a field trial was carried out in a ‘Verdejo’/110 Richter vineyard located in north-central Spain. Two levels of ethephon (0 and 1500 mg L−1) and ABA (0 and 800 mg L−1) were sprayed on clusters at veraison, in a factorial design for three consecutive seasons. Ethephon and ABA had additive effects, decreasing titratable acidity and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vitis vinifera L.; ABA; Growth regulators; Ripening; Tasting.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162018000500381

Herbage accumulation and grazing losses on Mulato grass subjected to strategies of rotational stocking management
Provedor de dados: 63
Autores: Silveira,Márcia Cristina Teixeira da; Silva,Sila Carneiro Da; Souza Júnior,Salim Jacaúna de; Barbero,Leandro Martins; Rodrigues,Carlindo Santos; Limão,Veridiana Aparecida; Pena,Karine da Silva; Nascimento Júnior,Domicio do.
Grazing management strategies affect not only herbage accumulation but also the efficiency of grazing. This study aimed to evaluate herbage accumulation (leaf, stem and dead material), grazing efficiency and losses of mulato grass (a Brachiaria ruziziensis × Brachiaria brizantha cv. Marandu hybrid) subjected to strategies of rotational stocking management. Treatments consisted of combinations between two post-grazing heights (15 and 20 cm) and two pre-grazing conditions (95 % and maximum canopy light interception (LI)) assigned to experimental units (1200-m² paddocks) according to a 2 × 2 factorial arrangement and a randomized complete block design, with four replications. The experiment was carried out from Jan 2008 to Mar 2009. Season of the year...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brachiaria spp.; Grazing efficiency; Light interception; Grazing management.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162013000400004

Soil physical properties and soil organic carbon content in northeast Brazil: long-term tillage systems effects
Provedor de dados: 63
Autores: Oliveira,Fernanda Cristina Caparelli; Ferreira,Gabriel William Dias; Souza,João Lucas Santos; Vieira,Matheus Emannuel Oliveira; Pedrotti,Alceu.
ABSTRACT Concerns about the negative effects of agriculture on soil physical quality and soil organic carbon (SOC) pools have spurred on the adoption of conservation tillage systems in tropical regions. This study aimed to evaluate the long-term impacts (16th year) of conventional (CT), minimum (MT) and no-tillage (NT) practices and different cover crops (sunn hemp and a bean/millet sequence) on soil physical properties and SOC content of a corn cultivated Ultisol in the northeast of Brazil. Soil bulk density (Bd), soil penetration resistance (SPR), soil aggregation, and total aggregate-associated carbon (C) (4-2 mm) were evaluated. Tillage practices exerted strong control on soil physical properties and total aggregate-C content but were influenced by...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: No-till cropping systems; Minimum-tillage; Soil bulk density; Mean weight diameter; Total aggregate-associated carbon.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000401601

Sample size for single, double and thee-way hybrid corn ear traits
Provedor de dados: 63
Autores: Storck,Lindolfo; Lopes,Sidinei José; Cargnelutti Filho,Alberto; Martini,Luiz Fernando Dias; Carvalho,Melissa Pisaroglo de.
Using adequate sample size in experimental units improves the efficiency of the research. In the agricultural year of 2004/2005, an experiment was conducted in Santa Maria, Rio Grande do Sul State, Brazil, with the objective of estimating sample size for the following traits: ear length, ear and cob diameter, ear weight, weight of grains per ear, cob weight and the weight of 100 grains, number of grain rows per ear, number of grains per ear and length of grains for two single hybrids (P30F33 and P Flex), two three-way hybrids (AG8021 and DG501) and two double hybrids (AG2060 and DKB701) of maize. For a 5% (D5) precision, the weight traits (dehusked ear weight, weight of grains per ear, cob weight and weight of 100 grains) can be sampled with 21 ears; the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays L.; Experimental accuracy; Sampling.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000100005

Nutritive value of sugarcane silage treated with chemical additives
Provedor de dados: 63
Autores: Santos,Mateus Castilho; Nussio,Luiz Gustavo; Mourão,Gerson Barreto; Schmidt,Patrick; Mari,Lucas José; Ribeiro,José Leonardo; Queiroz,Oscar Cézar Müller; Zopollatto,Maity; Sousa,Daniel de Paula; Sarturi,Jhones Onorino; Toledo Filho,Sérgio Gil de.
The use of ensiled sugarcane has been increased lately in Brazil due to the benefits that this technique represents. The objective of this study was to evaluate the effects of chemical additives on the nutritive value of sugarcane silages. The trial was carried out in a completely randomized experimental design with four replicates per treatment. The following additives were applied onto the fresh forage before ensiling: L. buchneri, lime or limestone, 1.0 and 1.5% (wet basis) each, and gypsum 1.0% (wet basis), all of them diluted into 40 L of water per ton of fresh weight of forage. The analyzed variables were: ash, crude protein, neutral detergent fiber, acid detergent fiber and organic and dry matter digestibility. The addition of lime or limestone...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Calcium carbonate; Calcium oxide; Calcium sulfate.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000200003

PHOSPHORUS METABOLISM AND ESTIMATION OF PHOSPHORUS REQUIREMENTS FOR SHEEP
Provedor de dados: 63
Autores: LOUVANDINI,H; VITTI,D.M.S.S.
The main objective of the present work was to determine the effects of different dietary phosphorus (P) levels on endogenous faecal loss and to estimate the minimum daily requirement of P for sheep. The study was conducted with 24 Suffolk sheep which received a basic diet consisting of hay-concentrate mixture. The treatments consisted of different amounts of bone meal, added to the basic diet, so as to obtain supplementary P levels of 0, 1, 2 and 3g/day. Twenty-one days after the introduction of the experimental diet, 7.4 MBq radioactive P (32P) was injected into the left jugular vein of each sheep and blood, faeces and urine samples were collected daily for 8 days at 24-hour intervals. The samples were analysed for inorganic P and for radioactive specific...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phosphorus; Sheep; Nutrition.
Ano: 1996
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161996000100027

Ocorrência do vírus "vein enation (woody gall)" em limão verdadeiro (Citrus limon burm. cv siciliano) em Santa Catarina
Provedor de dados: 63
Autores: KOLLER,O.L.
Relata-se a ocorrência do vírus causador da doença "vein enation", também conhecida por "woody gall", em plantas de limão verdadeiro, em Santa Catarina, introduzido em pomar comercial através de mudas adquiridas em São Paulo. Limão `Volkameriano' enxertado com material contaminado desenvolveu os sintomas característicos de "woody gall", com grande intensidade no Alto Vale do Itajaí, e com menor intensidade no Litoral Norte de Santa Catarina. Constatou-se redução no desenvolvimento das plantas e na produção de frutos. Todo material sabidamente contaminado foi erradicado. Sugere-se às instituições oficiais de pesquisa a realização de testes de indexação para esta virose em seus bancos de germoplasma, uma vez que grande parte das variedades cítricas não...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Limão Siciliano; Limão Volkameriano; Indexação; Vírus "vein enation".
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000300025

A system for generating virtual seeds
Provedor de dados: 63
Autores: Sako,Y.; Fujimura,K.; McDonald,M.B.; James,D.
Seed analysts need to identify seeds, and seed catalogs are used as a reference to accomplish this task. Conventional seed catalogs supply two-dimensional photographs and hand-drawn diagrams. In this study, a new, three-dimensional representation of seeds is developed to supplement these traditional photographs and drawings. QuickTime VR is a promising method for viewing three-dimensional objects on a computer screen. It permits manipulation of an object by rotating and viewing it from any pre-specified angle at an interactive speed, allowing the viewer the sense of examining a hand-held object. In this study, QuickTime VR object movies of seeds were created as interactive "movies" of seeds that can be rotated and scaled to give the viewer the sensation of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Seed catalog; Computer-aided visualization; Seed identification; Vision imaging; Seed purity.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000500007

Diagnóstico de sintomas de deficiência de macronutrientes em pimenteira do reino(Piper nigrum, L.)
Provedor de dados: 63
Autores: Veloso,C.A.C.; Muraoka,T.
Com o propósito de caracterizar os sintomas de deficiências dos macronutrientes em pimenteira do reino (Piper nigrum L.), conduziu-se um ensaio usando mudas de pimenteira, cultivar "Guajarina", cultivadas em vasos contendo sílica, com as seguintes soluções nutritivas: omissão de N, omissão de P, omissão de K, omissão de Ca, omissão de Mg, omissão de S, e solução nutritiva completa. Após um período compreendido entre 90-150 dias, começaram a aparecer os sintomas de deficiência devido a omissão dos macronutrientes. Os nutrientes mais absorvidos foram potássio e o nitrogênio, seguindo-se pela ordem decrescente o cálcio, o magnésio, o enxofre e o fósforo. Concluiu-se que a omissão de nitrogênio foi o tratamento que mais afetou o desenvolvimento das plantas....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pimenta do reino; Nutrição; Sintomas de deficiência; Diagnose visual.
Ano: 1993
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161993000200010

Acclimatization of 'VR043-43' (Vitis vinifera x Vitis rotundifolia) grapevine rootstock
Provedor de dados: 63
Autores: Machado,Marília Pereira; Biasi,Luiz Antonio; Ritter,Marlice; Ribas,Luciana Lopes Fortes; Zanette,Flávio.
The pre-acclimatization stage can be used to improve micropropagation protocols and increase the yield of produced plants. The influence of sucrose and photon flux density (PFD) levels on the acclimatization of in vitro-grown 'VR043-43' (Vitis vinifera x Vitis rotundifolia) grapevine rootstocks was evaluated. Rooted shoots were obtained from 4-week-old in vitro shoots cultivated in QL (Quoirin and Lepoivre, 1977) culture medium supplemented with 15, 30 and 45 g L-1 of sucrose. The experiment was kept in a 25 ± 2ºC growth room, under 16-h photoperiod and PFD of 18 µmol m-2 s-1 or 43 µmol m-2 s-1. Plants were transferred to an intermittent misting system greenhouse for 10 d followed by 20 d of once-a-day watering routine using a handheld hose. Plant height...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Tissue culture; Sucrose; Micropropagation.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000400007

Technical and economic assessment of trash recovery in the sugarcane bioenergy production system
Provedor de dados: 63
Autores: Cardoso,Terezinha de Fátima; Cavalett,Otávio; Chagas,Mateus Ferreira; Morais,Edvaldo Rodrigo de; Carvalho,João Luís Nunes; Franco,Henrique Coutinho Junqueira; Galdos,Marcelo Valadares; Scarpare,Fábio Vale; Braunbeck,Oscar Antonio; Cortez,Luis Augusto Barbosa; Bonomi,Antonio.
Mechanized sugarcane (Saccharum spp.) harvest without burning has been increasingly adopted in Brazil, increasing trash availability on the field. This study aims at showing the importance of using an integrated framework tool to assess technical and economic impacts of integral harvesting and baling trash recovery strategies and different recovery rates as well as its implications in the sugarcane production, transport and processing stages. Trash recovery using baling system presents higher costs per unit of mass of recovered trash in comparison to system in which trash is harvested and transported with sugarcane stalks (integral harvesting system). However, the integrated agricultural and industrial assessment showed that recovering trash using baling...
Tipo: Info:eu-repo/semantics/article
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162013000500010

Hyperspectral field reflectance measurements to estimate wheat grain yield and plant height
Provedor de dados: 63
Autores: Xavier,Alexandre Cândido; Rudorff,Bernardo Friedrich Theodor; Moreira,Mauricio Alves; Alvarenga,Brummer Seda; Freitas,José Guilherme de; Salomon,Marcus Vinicius.
Hyperspectral crop reflectance data are useful for several remote sensing applications in agriculture, but there is still a need for studies to define optimal wavebands to estimate crop biophysical parameters. The objective of this work is to analyze the use of narrow and broad band vegetation indices (VI) derived from hyperspectral field reflectance measurements to estimate wheat (Triticum aestivum L.) grain yield and plant height. A field study was conducted during the winter growing season of 2003 in Campinas, São Paulo State, Brazil. Field canopy reflectance measurements were acquired at six wheat growth stages over 80 plots with four wheat cultivars (IAC-362, IAC-364, IAC-370, and IAC-373), five levels of nitrogen fertilizer (0, 30, 60, 90, and 120 kg...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Remote sensing; Agriculture; Vegetation indices.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000200004

Cassava processing wastewater as a platform for third generation biodiesel production
Provedor de dados: 63
Autores: Neves,Cristina; Maroneze,Mariana Manzoni; Santos,Aline Meireles dos; Francisco,Erika Cristina; Wagner,Roger; Zepka,Leila Queiroz; Jacob-Lopes,Eduardo.
ABSTRACT This study aimed to evaluate third generation biodiesel production by microalgae Phormidium autumnale using cassava processing wastewater as a platform. Experiments were performed in a heterotrophic bubble column bioreactor. The study focused on the evaluation of the bioreactor (batch and fed-batch) of different operational modes and the analysis of biofuel quality. Results indicate that fed-batch cultivations improved system performance, elevating biomass and oil productions to 12.0 g L−1 and 1.19 g L−1, respectively. The composition of this oil is predominantly saturated (60 %) and monounsaturated (39 %), resulting in a biodiesel that complys with U.S., European and Brazilian standards. The technological route developed indicates potential for...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Microalgae; Cyanobacteria; Agroindustrial wastewater; Biofuel.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000500412

Germination and vigour of primed asparagus seeds
Provedor de dados: 63
Autores: Bittencourt,Mário Lúcio de Carvalho; Dias,Denise Cunha Fernandes dos Santos; Dias,Luiz Antônio dos Santos; Araújo,Eduardo Fontes.
The osmotic conditioning or priming is considered a promising technique to speed up germination and to improve seed performance. Four seed lots of asparagus, Mary Washington cultivar, were primed at 25°C for seven or 14 days using PEG 6000 at -1.0 or -1.2 MPa, or sea water at -3.3 MPa; or for three days in distilled water. The physiological quality of the seeds was evaluated by standard germination, first count germination, speed of seedling emergence, and germination percentage and seedling fresh and dry weights after controlled deterioration test. Primed seeds presented higher germination speed, independently of their initial physiological quality. Beneficial effects of priming on germination and vigour were more expressive in the seed lot of low...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Osmotic conditioning; Physiological quality.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000400003

Respiration rate of Golden papaya stored under refrigeration and with different controlled atmospheres
Provedor de dados: 63
Autores: Martins,Derliane Ribeiro; Barbosa,Nayara Cantarino; Resende,Eder Dutra de.
Knowledge of the respiration rate during the storage is important in the evaluation of the post-harvest tools that preserve fruit quality, and also for the provision of information for the development of new packages. This work aimed to evaluate the respiration rate of 'Golden' Carica papaya stored under refrigeration and controlled atmosphere conditions. The fruit was kept at 13 °C in controlled atmospheres comprising three levels of O2 (20.8 %, 6 %, 3 %) with a minimum level of CO2 (0.1 %); and three levels of CO2 (0.1 %, 6 %, 12 %) with the lowest level of O2 (3 %). Measurements were taken at intervals of 5 days during the 30 days of storage. The mass loss and the peel color of the fruits were identified at the end of the storage period. The fruit...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Carica papaya; Cold storage; Modified atmosphere; Ripening; Mass loss.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162014000500004

Utilização da reserva orgânica e de nitrogênio do tolete de plantio (colmo-semente) no desenvolvimento da cana-planta
Provedor de dados: 63
Autores: Carneiro,A.E.V.; Trivelin,P.C.O.; Victoria,R.L.
Toletes (colmo-semente) com um nó (uma gana) mais metade do entre-nó inferior e metade do superior foram obtidos do terço médio de colmos de cana-de-açúcar, marcados com 15N, da variedade NA 56-79. A massa seca, o conteúdo de nitrogênio e a abundância isotópica de 15N dos toletes foram estimados tomando-se por base os valores obtidos em amostra de cada colmo. Os toletes foram plantados em vasos com 6kg de terra colhida de uma Terra Roxa Estruturada Latossólica (RHODIC KANHAPLUDALF). O experimento foi conduzido em casa-de-vegetação, em delineamento inteiramente casualizado, com 16 tratamentos correspondentes à colheitas em diferentes tempos após o plantio. Nas plantas, subdivididas em amostras de parte aérea, raízes e tolete remanescente, foram determinados...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Translocação de N; 15N; N do tolete (colmo-semente); Cana-de-açúcar; Cana-planta.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000200001

Recovery of soil microbiological properties in a degraded area planted with Corymbia citriodora and Leucaena leucocephala
Provedor de dados: 63
Autores: Valpassos,Maria Alexandra Reis; Maltoni,Kátia Luciene; Cassiolato,Ana Maria Rodrigues; Nahas,Ely.
The influence of reforestation was evaluated during two season periods (February and October) in sites planted with Corymbia citriodora and Leucaena_leucocephala through microorganism counts (bacteria, fungi, actinomycetes, and nitrite oxidizers) and microbial activity (respiratory and urease activities). An Atlantic forest and a bare soil site were used as controls. The general trends of the variables in the different soils were: Atlantic forest or L. leucocephala &gt; C. citriodora &gt; bare soil. The microbial populations in L. leucocephala and C. citriodora soils were significantly higher (P &lt; 0.05) than that found in the bare soil. Similar results were obtained for respiratory and urease activities. The microbiological variables of the soil under...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bacteria; Fungi; Forest degradation; Respiratory activity; Urease.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000100010

Biosolids effectiveness to yield ryegrass based on their nitrogen content
Provedor de dados: 63
Autores: Corrêa,Rodrigo Studart; White,Robert E.; Weatherley,Anthony J.
Biosolids have been reported to increase yields and supply plant nutrients. However, complying with health and environmental standards is necessary before applying biosolids to land. Thus, sludge stabilization is required to make biosolids safe enough for their agricultural use. Side effects of stabilization processes on agronomic features of sewage sludge are not quite known, although their understanding is essential for biosolids management. Based on a model equivalent to the Mitscherlich equation, effects of the most common processes for sludge stabilization were evaluated (composting, liming, heat-drying and solar irradiation) in relation to the agronomic effectiveness of biosolids to yield Lolium perenne L. on two tropical soils, with NH4H2PO4 as a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lolium perenne L.; Mitscherlich; Sewage sludge; Biosolids; Agronomic efficiency.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000300011

Noise analysis to evaluate chick thermal comfort
Provedor de dados: 63
Autores: Moura,Daniella Jorge de; Nääs,Irenilza de Alencar; Alves,Elaine Cangussu de Souza; Carvalho,Thayla Morandi Ridolfi de; Vale,Marcos Martinez do; Lima,Karla Andrea Oliveira de.
The relationship between thermal environment and chick performance has widely been evaluated, however the consideration that the assessment of the comfort may be estimated by interpreting both amplitude and frequency of bird vocalization under tropical housing conditions is a new concept. This research had as objective of estimating thermal comfort for chicks during the heating phase using this new concept. An experiment was carried out inside a climate controlled chamber (A) for establishing the behavioral pattern related to environmental temperature limits. Forty five chicks were reared inside a 2.3 m² box. A video camera was placed 2.0 m above the birds and the images were captured and registered in a computer. From the pattern determined in the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Broiler production; Analysis of signals; Thermal environment; Behavior.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000400018

Effect of partial soil wetting on transpiration, vegetative growth and root system of young orange trees
Provedor de dados: 63
Autores: Vellame,Lucas Melo; Fraga Júnior,Eusímio Felisbino; Coelho,Rubens Duarte.
The wetted area fraction is a factor critical to the success of drip irrigation. This study aimed to evaluate the effect of partial soil wetting on transpiration, vegetative growth and root system of young orange trees. The experiment was carried out in a greenhouse where plants were grown in 0.5 m3boxes internally divided into compartments. The wetting of 12 % of soil area was tested on two types of soil cultivated with ‘Valencia’ orange trees grafted onto Rangpur lime and ‘Swingle’ citrumelo rootstocks. Transpiration was determined in 40 plants. Water extraction and root density were evaluated in the compartments. Transpiration is reduced by restriction in wetted soil area, and such reduction is influenced by the number of days after the beginning of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Drip irrigation; Sap flow; Wetted bulb; Root length density.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162015000500377

Salinomycin and virginiamycin for lactating cows supplemented on pasture
Provedor de dados: 63
Autores: Oliveira,Isis Scatolin de; Sousa,Daniel de Paula; Queiroz,Augusto Cesar de; Macedo,Bruna Gomes; Neves,Camila Garcia; Bianchi,Isabela Eloisa; Teobaldo,Ronyatta Weich.
Animals on pasture generally show higher feed efficiency as a result of the use of antibiotics. This study evaluated the effect of the antimicrobials salinomycin and/or virginiamycin on production and the ruminal parameters of supplemented dairy cows grazing on Panicum maximum cv. Tanzania. Twelve Holstein/Zebu multiparous cows were used, distributed in three Latin squares, one for the evaluation of ruminal parameters, and the others for production parameters. Cows on pasture were fed 50 % of their estimated intake with corn silage and concentrate supplements containing salinomycin, virginiamycin or a combination of additives, in doses of 120 and 150 mg kg−1, respectively. There were no differences in milk production and composition, energy and nitrogen...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Panicum maximum; Digestibility; Feeding behavior; Ionophores; Nitrogen balance.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162015000400285

Economic injury level for sugarcane caused by the spittlebug Mahanarva fimbriolata (Stål) (Hemiptera:Cercopidae)
Provedor de dados: 63
Autores: Dinardo-Miranda,Leila Luci; Pivetta,João Paulo; Fracasso,Juliano Vilela.
The sugarcane spittlebug, Mahanarva fimbriolata (Stål), is currently one of the most important pests of the sugarcane crop in Brazil. In spite of its economic importance, advances in the management of this pest have been limited by the lack of information on the economic injury level. In this study, the economic injury level for M. fimbriolata was estimated in a field experiment, over areas harvested in September, applying thiamethoxam at 200 g a.i. ha-1 or imidacloprid at 720 g a.i. ha-1. In one of the experiments, insecticide applications were made at pest infestation values of 4.2 (11/12/04), 7.1 (01/11/05), or 16.3 (01/18/05) insects m-1, and in experiment 2 when pest populations were 5.6 (11/12/04), 8.5 (01/11/05), or 15.3 (01/11/05) insects m-1....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pest; Management; Control.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000100003

Remediation of salt-affected soil by the addition of organic matter: an investigation into improving glutinous rice productivity
Provedor de dados: 63
Autores: Cha-um,Suriyan; Kirdmanee,Chalermpol.
Soil salinity may limit plant growth and development, and cause yield loss in crop species. This study aimed at remediating saline soil using organic matter (OM) treatment, before the cultivation of RD6 rice (Oryza sativa L. spp. indica). Physiological and morphological characters of rice plants, as well as crop yield, were evaluated from salt-affected soil with varying levels of salinity. The chlorophyll a and total chlorophyll pigments of rice plants grown in salt-affected soil (2% salt level) with the application of OM were maintained better than in plants grown without OM treatment. The degree of reduced photosynthetic pigments in rice plants was dependent on the level of salt contamination. Pigment content was positively related to maximum quantum...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chlorophyll a fluorescence; Inland salinity; Pigment stabilization; Net photosynthetic rate; Yield.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000400003

Health risk assessment of heavy metals in vegetables grown around battery production area
Provedor de dados: 63
Autores: Chen,Ying; Wu,Pingping; Shao,Yufang; Ying,Yibin.
Battery production is one of the main sources of heavy metals that present great harm to human health even in low concentrations. Chromium (Cr), Cadmium (Cd) and Lead (Pb) were measured in edible portions of vegetables and soils around a battery production area in China, and the potential health risk of heavy metal contamination to the local population via vegetable consumption was evaluated. Their concentrations in edible portions of vegetables were 2.354 (0.078-14.878), 0.035 (0.003-0.230) and 0.039 (0.003-0.178) mg kg-1, respectively. Approximately 3 % of the Cd in the vegetable samples exceeded the maximum concentration allowable by national food safety criteria, although Pb content in all samples were within the criteria. Transfer factors (TF) from...
Tipo: Info:eu-repo/semantics/article
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162014000200006

Comportamento fisiológico de goiabeira serrana quando multiplicada por mergulhia de cepa
Provedor de dados: 63
Autores: Mielke,MS.; Fachinello,J.C.; Nachtigal,J.C.; Matiuz,B.; Endres,L.; Santos Filho,B. Gomes dos.
Com o objetivo de estudar alguns fatores fisiológicos envolvidos na formação e desenvolvimento de raízes em mudas de goiabeira serrana (Feijoa sellowiana Berg), multiplicadas por mergulhia de cepa, foi realizado um experimento em Pelotas-RS, com mudas decepadas em julho de 91 e sobre as quais foi realizada amontoa em outubro de 91. A avaliação foi feita em agosto de 92, sendo observadas as variáveis: teor de clorofila total, área foliar, numero e diâmetro de brotações, número e percentagem de brotações enraizadas e peso da matéria seca das raízes. As variáveis teor de clorofila, área foliar e diâmetro médio das brotações não apresentaram influência sobre a matéria seca das raízes. O incremento no número de brotações causou um aumento no número de brotações...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Feijoa sellowiana Berg; Goiabeira serrana; Mergulhia; Fisiologia vegetal.
Ano: 1994
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000100004

Crescimento de calos embriogênicos de milho submetidos ao estresse salino
Provedor de dados: 63
Autores: Bezerra,Josabete Salgueiro; Willadino,Lília; Camara,Terezinha Rangel.
A salinidade do solo é um problema muito importante em áreas irrigadas do semi-árido brasileiro, onde o milho é uma cultura de subsistência. Este trabalho teve como objetivo estudar o efeito de concentrações de NaCl sobre calos embriogênicos, da cultivar Jatinã C3 Anão, uma importante cultivar de milho no Nordeste do Brasil. A indução dos calos foi feita a partir de embriões imaturos assepticamente retirados das sementes e inoculados em meio de cultura N6 suplementado com 2 mg L-1 de 2,4-D. Os calos embriogênicos foram submetidos a diferentes concentrações de cloreto de sódio (0; 50; 100; 150 e 200 mmol L-1 de NaCl), com três repetições durante 60 dias. Os calos submetidos a 100 mmol L-1 de NaCl apresentaram aumento no conteúdo de prolina na ordem de 37%...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays; Salinidade; Embriogênese somática; Prolina.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000200007

Biology and fertility life table of Mahanarva fimbriolata (Stål) (Hemiptera: Cercopidae) in sugarcane
Provedor de dados: 63
Autores: Garcia,José Francisco; Botelho,Paulo Sérgio Machado; Parra,José Roberto Postali.
Mahanarva fimbriolata (Stål) (Hemiptera: Cercopidae) is the most important pest of sugarcane harvested without the use of fire to burn leaf trash. Its biology was studied for three generations in order to obtain basic information about its life cycle. A fertility life table was used to evaluate the quality of laboratory-reared insects. Data were obtained at a temperature of 25 ± 1ºC, RH of 70 ± 10%, and a 14-hour photophase. The incubation period lasted 21 days with a viability of 81%; the nymph stage had a duration of 37 days, with a 94% viability; the male and female longevities were 18 and 23 days, respectively, with a pre-oviposition period of 5 days and an oviposition period of 16 days, with a fecundity of 342 eggs, with a life-cycle (egg-adult) of 60...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Insecta; Sugarcane spittlebug; Fecundity.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000400001

Biological aspects and life table of Uroleucon ambrosiae (Thomas, 1878) as a function of temperature
Provedor de dados: 63
Autores: Auad,Alexander Machado; Moraes,Jair Campos de.
The aphid Uroleucon ambrosiae (Thomas) is considered a pest of hidroponically-grown lettuce, but basic and applied information on its control are scarce in Brazil. The aim of this study was to determine the effect of different temperatures on biological aspects and life history of U. ambrosiae (Thomas) developing on hydroponic lettuce (Lactuca sativa L.) crop. Newly emerged nymphs were placed on 4-cm discs of hydroponic lettuce, var. Verônica, which were maintained on 5-cm Petri dishes, at temperatures of 15, 20 and 25ºC and 14 h photophase, and inside a greenhouse, within micro-cages at room temperature. The duration of development in all nymphal stages varied inversely to temperature. Nymphs maintained at 20ºC and 25ºC, had similar development period....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Insecta; Aphids; Biology; Climatic factors.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000400008

Soil physical indicators of management systems in traditional agricultural areas under manure application
Provedor de dados: 63
Autores: Rauber,Luiz Paulo; Andrade,Andréia Patrícia; Friederichs,Augusto; Mafra,Álvaro Luiz; Baretta,Dilmar; Rosa,Márcio Gonçalves da; Mafra,Maria Sueli Heberle; Correa,Juliano Corulli.
ABSTRACT Studies of the successive application of manure as fertilizer and its combined effect with long-term soil management systems are important to the identification of the interdependence of physical attributes. The aim of this study was to evaluate changes in the physical properties of a Rhodic Kandiudox under management systems employing successive applications of pig slurry and poultry litter, and select physical indicators that distinguish these systems using canonical discriminant analysis (CDA). The systems consisting of treatments including land use, management and the application time of organic fertilizers are described as follows: silage maize under no-tillage (NT-M7 years); silage maize under conventional tillage (CT-M20 years); annual...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Crop system; Organic fertilization; Soil quality.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162018000400354

Planosol soil sample size for computerized tomography measurement of physical parameters
Provedor de dados: 63
Autores: Pedrotti,Alceu; Pauletto,Eloy Antonio; Crestana,Silvio; Cruvinel,Paulo Estevão; Vaz,Carlos Manoel Pedro; Naime,João de Mendonça; Silva,Alvaro Macedo da.
Computerized tomography (CT) is an important tool in Soil Science for noninvasive measurement of density and water content of soil samples. This work aims to describe the aspects of sample size adequacy for Planosol (Albaqualf) and to evaluate procedures for statistical analysis, using a CT scanner with a 241Am source. Density errors attributed to the equipment are 0.051 and 0.046 Mg m-3 for horizons A and B, respectively. The theoretical value for sample thickness for the Planosol, using this equipment, is 4.0 cm for the horizons A and B. The ideal thickness of samples is approximately 6.0 cm, being smaller for samples of the horizon B in relation to A. Alternatives for the improvement of the efficiency analysis and the reliability of the results obtained...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lowland; Albaqualf; Bulk density; Compaction; Soil moisture.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000400019

Accuracy and simultaneous selection gains for N-stress tolerance and N-use efficiency in maize tropical lines
Provedor de dados: 63
Autores: Mendonça,Leandro de Freitas; Granato,Ítalo Stefanine Correia; Alves,Filipe Couto; Morais,Pedro Patric Pinho; Vidotti,Miriam Suzane; Fritsche-Neto,Roberto.
ABSTRACT Maize plants can be N-use efficient or N-stress tolerant. The first have high yields in favorable environments but is drastically affected under stress conditions; whereas the second show satisfactory yields in stressful environments but only moderate ones under optimal conditions. In this context, our aim was to assess the possibility of selecting tropical maize lines that are simultaneously N-stress tolerant and N-use efficient and check for differences between simultaneous selection statistical methods. Sixty-four tropical maize lines were evaluated for Nitrogen Agronomic Efficiency (NAE) and Low Nitrogen Tolerance (LNTI) response indices and two per se selection indices, Low Nitrogen Agronomic Efficiency (LNAE) and Harmonic Mean of Relative...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Abiotic stress; Correlation between traits; Winter maize; Mixed models.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162017000600481

Effect of harvesting time on seed physiological quality, chemical composition and storability of soybeans
Provedor de dados: 63
Autores: Marcos-Filho,J.; Chamma,H.M.C.P.; Casagrande,J.R. R.; Marcos,E.A.; Regitano-d'arce,M.A.B.
Soybeans IAC-8 were harvested in the growth stages R7 and R8 commercial harvesting time and at two other subsequent times to compare their physiological and technological characteristics. Seeds were stored at two moisture levels, 12% and 15%, for 6 months. Germination and vigor (acelerated aging, electrical conductivity), oil and free fatty acids, peroxide and iodine values were evaluated periodically. As expected, the time of harvesting and seed moisture content affected seed performance, while oil content did not correlate to physiological quality as did acidity, peroxide value and iodine number.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycine max; Seeds; Maturation; Storage; Germination vigor.
Ano: 1994
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000200016

Colored polyethylene soil covers and grafting effects on cucumber flowering and yield
Provedor de dados: 63
Autores: Fonseca,Inês Cristina de Batista; Klar,Antonio Evaldo; Goto,Rumy; Neves,Carmen Silvia Vieira Janeiro.
Cucumber (Cucumis sativus L.) is one of the most cultivated vegetable crops in plastic greenhouses in Brazil because of the short cycle and its high economic value in off-season harvests. To better understand this management technique the effect of different colored polyethylene soil covers was evaluated in relation to flowering and yield of the hybrid cucumber 'Yoshinari' grafted or not on the hybrid squash 'Ikky'. The polyethylene cover colors were black, white on black and green plus a control without cover. Covered but not grafted crops had a more uniform flowering distribution. The number of flowers was greater for the white/black grafted treatment. All the polyethylene covers favored flowering for the non grafted plants. Grafting reduced flowering...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cucumis sativus; Cucurbita spp.; Plastic greenhouse; Rootstock.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000400006

Relationship between acidity and chemical properties of brazilian soils
Provedor de dados: 63
Autores: Abreu Jr.,Cássio Hamilton; Muraoka,Takashi; Lavorante,André Fernando.
In soils of tropical climate regions the high acidity and the presence of exchangeable aluminum (Al3+), associated to low fertility, are the main restrainting factors for agricultural production. A laboratory experiment was conducted using 26 soils of different Brazilian regions, to investigate soil acidity components, giving emphasis to Al and their relations with chemical properties. The pH correlated positively with P, Ca, Mg, K, BS, CEC and V% values, and negatively with Al saturation. The Al3+ was the predominant exchangeable cation in 32% of the soils with pH below 5.6. The KCl titratable H+ represents the hydroxi-Al(OH)x complex with low stability and the Wolf-Morgan extracted Al corresponds to the exchangeable + non-exchangeable Al species. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Total acidity; Exchangeable acidity; PH; Aluminum in soil.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000200019

Estimation of carcass and empty body composition of zebu bulls using the composition of rib cuts
Provedor de dados: 63
Autores: Lanna,D.P.D.; Boin,C.; Alleoni,G.F.; Leme,P.R.
Determination of body composition is very important in nutritional and growth regulation studies. However, determination of body composition by grinding and analyzing all tissues is unfeasible as an experimental routine. The objective of this study was to test methodologies for body composition estimation. Linear measurements and chemical composition of the 9-10-11th and 10th rib sections were used to estimate chemical composition of 31 Nellore (Zebu) intact males with an average 333.5 kg body weight (range of 180.5 to 496.0) and 16.1% empty body lipid (range of 10.6 to 22.1). Composition of ribs, carcass and empty body were obtained by quantitatively grinding, homogenizing and sampling all body tissues. The 9-10-11th composition was a good estimator of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bovinos; Body composition; Rib cut; Zebu.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000100032

Archaeological material for the study of crop evolution
Provedor de dados: 63
Autores: Freitas,Fábio de Oliveira; Martins,Paulo Sodero.
This research studies archaeological samples of maize (Zea mays mays) and cassava (Manihot esculenta), from Januaria, MG, Brazil, for samples between 1010 (for the oldest sample) and 570 years (for the most recent) as estimated through radiocarbon dating. Maize cobs were morphologically analysed by using length, basal and apical diameters, largest diameter, number of rows, number of grains per row, and number of grains per row per length parameters. The maize cob length presented increases through time, allowing an increase on the number of seed per cob, but the size of seeds did not vary significantly. Starch present in the reserve organs of the maize and cassava were analysed morphologically through Scanning Electron Microscopy, and compared to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays; Manihot esculenta; Archaeology; Indigenous; Starch.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000200027

Microsatellite diversity and chromosome number in natural populations of Trifolium riograndense Burkart
Provedor de dados: 63
Autores: Conterato,Ionara Fatima; Dall'Agnol,Miguel; Schifino-Wittmann,Maria Teresa; Janke,Aline.
Twenty eight natural populations of Trifolium riograndense Burkart, an important forage legume from native pastures of the state of Rio Grande do Sul, Brazil, were evaluated for genetic diversity with eight Simple Sequences Repeats (SSR) markers. Chromosome numbers were also determined. The eight markers were polymorphic, with 35 alleles and an average of 4.37 alleles per locus, and Polymorphism Information Content (PIC) between 0.48 and 0.80. Group analysis based on Jaccard´s similarity coefficient separated the 28 accessions in nine groups, with an average genetic similarity of 0.44, indicating a high genetic variability among the populations. No evident relation between genetic distance and geographical origin was detected. The chromosome number of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Native clover; Genetic diversity; Cytogenetics; Native pastures.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162012000200005

MINERALIZAÇÃO E VOLATILIZAÇÃO DO NITROGÊNIO DA VINHAÇA-15N NA PRESENÇA OU NÃO DE URÉIA E DE PALHA DE CANA- DE-AÇÚCAR
Provedor de dados: 63
Autores: Silva,Vilma Maria; Trivelin,Paulo Cesar Ocheuze; Colaço,Waldeciro; Encarnação,Fernando Antonio Franco da; Lara Cabezas,Waldo Alejandro Ruben.
O N mineral e o N volatilizado derivado da vinhaça marcada com 15N foram determinados em amostras de dois solos (Podzólico Vermelho-Amarelo, arenoso - PV, e Latossolo Roxo, argiloso - LR) do município de Piracicaba, SP, em experimento de laboratório. Os solos foram tratados com vinhaça marcada com 15N (V*) na dose de 100 mg.kg-1 de N-vinhaça. Os tratamentos constaram da aplicação de vinhaça isoladamente (V*), de vinhaça e uréia (V*+U), de vinhaça e palha de cana-de-açúcar (V*+P), e de vinhaça mais uréia e palha (V*+U+P), e foram incubados por 7, 14, 21, 28 e 35 dias. As parcelas foram constituídas por 50 g de solo. As doses de incorporação de N-uréia e palha de cana-de-açúcar foram de 220 mg.kg-1 e 22 g.kg-1, respectivamente. As concentrações de N-NH4+ e...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vinhaça-15N; Uréia; Mineralização de N; Volatilização de N.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000100018

Biologia do ectoparasitóide Bracon hebetor Say, 1857 (Hymenoptera: Braconidae) em sete espécies de lepidópteros
Provedor de dados: 63
Autores: Magro,Sandra Regina; Parra,José Roberto Postali.
Bracon hebetor Say, 1857 é um ectoparasitóide larval de várias espécies de piralídeos que atacam grãos armazenados, sendo considerado um agente potencial de controle biológico dessas pragas. Assim, a biologia de B. hebetor foi estudada em condições controladas de temperatura (25 ± 2°C), umidade relativa (60 ± 10%) e fotoperíodo (fotofase de 14 horas), sobre sete espécies de lepidópteros, Anagasta kuehniella (Zeller), Corcyra cephalonica Stainton e Sitotroga cerealella (Olivier) (hospedeiros naturais) e Diatraea saccharalis (Fabricius), Heliothis virescens (Fabricius), Anticarsia gemmatalis Hübner, Spodoptera frugiperda (J.E. Smith) (insetos criados rotineiramente no laboratório de Biologia de Insetos da ESALQ/USP), para determinar o melhor hospedeiro para...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Insecta; Controle biológico; Parasitóide.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000400007

Influência do preparo do solo e da natureza do fertilizante nitrogenado na cultura do milho
Provedor de dados: 63
Autores: Favarin,J.L.; Fancelli,A.L.
Foi instalado um ensaio de campo, em solo Podzólico Vermelho-Escuro latossólico (PELa), para avaliar a influência do preparo do solo e a natureza da fonte do fertilizante nitrogenado, para adubação em cobertura, na cultura do milho. Os tipos de preparo do solo avaliados foram o convencional e o plantio direto. Em relação às fontes de nitrogênio, foram utilizadas: uma sólida, o sulfato de amônio (20%N), e outra fluida, o uran (32%N), aplicados à superfície do solo sem incorporação. A absorção de nitrogênio (mg/planta) foi determinada nas folhas, colmos, panículas e espigas, aos 53 e 67 dias após a emergência das plântulas. Na colheita, após a maturidade fisiológica, foi determinada a quantidade de nitrogênio acumulado e exportado, bem como a produção de...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Milho; Preparo do solo; Fertilizante nitrogenado.
Ano: 1992
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161992000400011

Amadurecimento e senescência de mamão com 1-metilciclopropeno
Provedor de dados: 63
Autores: Jacomino,Angelo Pedro; Kluge,Ricardo Alfredo; Brackmann,Auri; Castro,Paulo Roberto de Camargo e.
O mamão (Carica papaya L.) é uma fruta altamente perecível devido ao rápido amadurecimento após a colheita. A busca de técnicas que ampliem o período de conservação e reduzam as perdas pós-colheita é desejável. Mamões 'Sunrise Solo' foram colhidos em dois estádios de maturação (verde e maduro) e tratados com o antagonista competitivo do etileno 1-metilciclopropeno (1-MCP) nas concentrações de 0, 30, 90 e 270 nL L-1, durante 12 horas a 20ºC. Após o tratamentos os frutos foram armazenados em condições ambientais (20ºC) durante oito dias. A aplicação do 1-MCP (90 e 270 nL L-1) retardou a perda de coloração verde dos frutos e a incidência de podridões. Frutos verdes tratados com 1-MCP (270 nL L-1) apresentaram maior firmeza do que os frutos controle. O 1-MCP...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Carica papaya; 1-MCP; Etileno; Firmeza; Armazenamento.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000200015

DETERMINAÇÃO DO NÚMERO DE FÊMEAS VIRGENS POR ARMADILHA E PERIODICIDADE DE CAPTURA DE MACHOS DE Helicoverpa zea (BODDIE) (LEPIDOPTERA: NOCTUIDAE)
Provedor de dados: 63
Autores: MATRANGOLO,W.J.R; DELLA LUCIA,T.M.C; CRUZ,I; VILELA,E.F.
Avaliou-se em lavouras de milho em fase de liberação de estilo-estigmas, na EMBRAPA/CNPMS, em Sete Lagoas, MG, a atratividade de diferentes números de fêmeas virgens de Helicoverpa zea (Boddie) em armadilha adesiva, além de uma formulação comercial do feromônio sintético, proveniente dos E.E.U.U. A maior atividade de procura por acasalamento teve início nas primeiras horas da noite. Não houve diferença significativa entre médias de insetos capturados com uma, três ou cinco fêmeas. Cinco fêmeas por armadilha tornam o monitoramento pouco prático; uma apenas pode comprometer a captura por disfunção fisiológica ou mesmo morte. Não houve captura nas armadilhas contendo feromônio sintético, que, ao invés, capturou machos de Mythimna, outro Noctuidae. A maior...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Insecta; Feromônio sexual natural; Zea mays; Noctuidae.
Ano: 1996
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161996000100018

Poder de detecção de "Quantitative Trait Loci", da análise de marcas simples e da regressão linear múltipla
Provedor de dados: 63
Autores: Silva,Heyder Diniz; Vencovsky,Roland.
O mapeamento de locos envolvidos no controle gênico de caracteres quantitativos, QTL's, difere dos demais tipos de experimentos conduzidos em genética, por tratar-se, basicamente, de um procedimento de testes múltiplos. Um problema decorrente deste tipo de análise refere-se ao nível de significância conjunto e, consequentemente ao poder da mesma. Em vistas disto avaliou-se, via simulação computacional de dados, o poder de detecção de QTL's da análise de marcas simples, utilizando os critérios da razão de falsas descobertas (FDR) e de Bonferroni para determinação nível de significância conjunto alfa* e da regressão linear múltipla, empregando o procedimento "stepwise" para seleção das marcas. O procedimento baseado em regressão múltipla foi mais poderoso em...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: QTL; Correção de Bonferroni; Testes múltiplos; Razão de falsos positivos (FDR).
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000400020

Quadrados latinos obtidos por meio de técnicas de confundimento em ensaios fatoriais
Provedor de dados: 63
Autores: Nogueira,Maria Cristina Stolf; Corrente,José Eduardo; Piedade,Sônia Maria de Stefano.
Os esquemas em quadrado latino tem se mostrado muito úteis na experimentação agronômica e zootécnica. O modo de obtenção dos quadrados latinos em geral segue regras algébricas de construção a partir de operações básicas sobre o conjunto de números inteiros positivos, mais especificamente, sobre as classes de resto módulo (m). Da mesma forma, considerando um ensaio instalado em esquema fatorial, ao se usar a técnica do confundimento, formam-se tantos quadrados latinos ortogonais quantos forem os níveis de tratamento. Tais esquemas conduzem a repetições ortogonais de quadrados latinos. Assim, o objetivo deste trabalho é abordar a aplicação desta técnica de modo a facilitar o planejamento. É apresentado um exemplo de um ensaio fatorial 3 x 3 x 3 sem repetições.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Quadrado latino; Confundimento; Ensaios fatoriais.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000300008

Efeito da disponibilidade hídrica do substrato, DA QUALIDADE FISIOLÓGICA E do teor de água inicial das sementes de soja no PROCESSO de germinação
Provedor de dados: 63
Autores: ROSSETTO,C.A.V; NOVEMBRE,A.D. DA L.C; MARCOS FILHO,J; SILVA,W.R. DA; NAKAGAWA,J.
Com o objetivo de estudar o efeito da disponibilidade hídrica do substrato, da qualidade fisiológica e do teor de água inicial das sementes de soja no processo de germinação, utilizaram-se sementes de um lote de soja [Glycine max (L.) Merrill], do cultivar IAC-15, que foram submetidas ao envelhecimento artificial, a 41oC, durante 0, 36 e 42 horas, obtendo-se três diferentes níveis de vigor designados de lotes 1, 2 e 3, respectivamente. As sementes de cada lote, foram submetidas ao umedecimento artificial, a 20oC e 100% de umidade relativa do ar, visando a obtenção de três diferentes teores de água (90, 110 e 130 g de água/kg). Para cada lote, as sementes com 90, 110 e 130 g de água/kg foram colocadas para germinar sob os potenciais hídricos de -0,04;...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycine max; Soja; Semente; Germinação.
Ano: 1997
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161997000100014

Seasonality of soil water exchange in the soybean growing season in southern Brazil
Provedor de dados: 63
Autores: Moreira,Virnei Silva; Roberti,Débora R.; Minella,Jean Paolo; Gonçalves,Luis Gustavo G de; Candido,Luiz Antônio; Fiorin,Jackson E.; Moraes,Osvaldo L. L.; Timm,Andréa U.; Carlesso,Reimar; Degrazia,Gervásio Annes.
The processes of water transfer in the soil-plant-atmosphere system are strongly affected by soil use and management. Differences in the dynamics of soil water transfer between no-tillage (NT) and conventional tillage (CT) practices during a soybean (Glycine max) growing season in southern Brazil were assessed in this study. All the water balance components were analyzed during the soybean growing season (2009/2010). Rainfall, runoff, soil water storage and hydro-physical soil properties were analyzed under two tillage systems. The land-atmosphere water vapor exchanges, obtained from eddy covariance stations, were analyzed with regard to the soybean agroecosystem. Characterizations of soil water storage were also formulated in the 2006/2007 and 2008/2009...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Water balance; Soil water content; Evapotranspiration; No-tillage; Conventional tillage.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162015000200103

Viabilidade celular de Saccharomyces cerevisiae em cultura mista com Lactobacillus fermentum
Provedor de dados: 63
Autores: OLIVEIRA-FREGUGLIA,R. M.; HORII,J.
O presente trabalho teve por objetivo avaliar os efeitos de L. fermentum em cultura mista com S. cerevisiae sobre a viabilidade celular da levedura, bem como outros parâmetros relacionados com os produtos metabólicos bacterianos. Os microrganismos foram cultivados individualmente em meio de caldo de cana-de-açúcar diluído e suplementado com extrato de levedura e peptona. A partir da mistura de ambas as culturas foi acompanhada a viabilidade celular da levedura em ensaios denominados: cultura mista ativa, bactéria inativada por esterilização e inativada por agentes antimicrobianos. Nos cultivos onde foi observada floculação, foi testada a ação de enzimas do grupo peptidohidrolases (papaína, bromelina e ficina). A cultura mista ativa apresentou redução da...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Viabilidade; Floculação; Saccharomyces cerevisiae; Lactobacillus fermentum.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000300022

Genetic similarity of Brazilian hull-less and malting barley varieties evaluated by RAPD markers
Provedor de dados: 63
Autores: Kroth,Mariela Aparecida; Ramella,Micheline Sandra; Tagliari,Caroline; Francisco,Alicia de; Arisi,Ana Carolina Maisonnave.
Barley (Hordeum vulgare L.) is widely used for brewing and animal feed. Recently, it has become desirable for human consumption due to its high nutritional significance, specially hull-less or naked barley. There are differences in nutritional and malting characteristics among barley varieties. RAPD procedure is able to separate barley varieties at various similarity levels. The aim of this work was the RAPD analysis of six Brazilian hull-less varieties and seven malting varieties. PCR reactions were performed with eleven random primers. A total of 34 RAPD fragments was obtained with five primers. A dendrogram was constructed based on the Jaccard similarity coefficient. Barley varieties displayed an average similarity coefficient of 0.53. Intravarietal...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hordeum vulgare; Polymorphism; Molecular characterization.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000100007

Genetic similarity among Tunisian cultivated olive estimated through SSR markers
Provedor de dados: 63
Autores: Abdelhamid,Sofiane; Grati-kamoun,Naziha; Marra,Francesco; Caruso,Tiziano.
Olive (Olea europaea L. subsp. europaea var. europaea) is one of the oldest fruit tree in the Mediterranean basin, and is cultivated for oil and canned fruit. Part of this interest is driven by the economic importance of olive oil which is increasing throughout the world due to its beneficial effect to human health. In Tunisia, olive has great socio-economic importance, with more than 60 millions olive trees cultivated for olive oil production including a wide range of cultivars which are widely extended from the north to the south regions of the country for its high economic value. Here, we applied microsatellites (SSRs) molecular markers to assess the genetic variability of the most important Tunisian olive cultivars. In total, the 10 simple sequence...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Olea europaea; Genetic diversity; Microsatellite; Genetic relationships.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162013000100006

Potential for introducing improved production practices in food legumes with increased food security in Afghanistan
Provedor de dados: 63
Autores: Tavva,Srinivas; Singh,Murari; Rizvi,Javed; Saharawat,Yashpal Singh; Swain,Nigamananda; Shams,Kateb.
ABSTRACT: The restricted maximum likelihood method was used to assess performance following the introduction of improved varieties of chickpea and mungbean (an important source of plant protein in Afghanistan) as compared to local varieties using 242 farmer participatory demonstrations laid out in eight districts in Baghlan, Balkh and Uruzgan provinces in Afghanistan from 2009 to 2012. The impact of the varieties introduced on the enhancement of security of food and nutrition of farmers adopting such technologies was also assessed. Taking an average over the study period, chickpea improved varieties (Madad and Sehat) recorded 56 and 72 % more yield over the local ones, respectively, while in case of mungbean varieties, Mai 2008 and Maash 2008 recorded 22...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Improved varieties; Chickpea and mungbean; Farmer participatory demonstrations; Mixed linear model; Restricted maximum likelihood estimation.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162019000100041

Tiller size/population density compensation in grazed Coastcross bermudagrass swards
Provedor de dados: 63
Autores: Sbrissia,André Fischer; Silva,Sila Carneiro da; Carvalho,Carlos Augusto Brandão de; Carnevalli,Roberta Aparecida; Pinto,Luiz Felipe de Moura; Fagundes,Jaílson Lara; Pedreira,Carlos Guilherme Silveira.
Several compensatory mechanisms in pastures do not allow optimisation of responses from the processes of herbage production and utilisation. Compensation due to tiller size/density relationships is one of these mechanisms. This experiment evaluated this process for Coastcross bermudagrass and compared the responses to those reported for temperate forages. Treatments were "steady state" sward surface heights of 5, 10, 15, and 20 cm that were maintained from August, 1998, through July, 1999 by sheep grazing. The experimental design was a randomised complete block, replicated four times. Pasture responses were evaluated on four separate dates (15/12/1998, 25/01/1999, 07/04/1999 and 04/07/1999) with respect to: tiller population density, tiller weight, leaf...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cynodon; LAI; Tiller; Morphology.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000400002

Swine deep bedding ashes as a mineral additive for cement based mortar
Provedor de dados: 63
Autores: Di Campos,Melissa Selaysim; Barbosa,Normando Perazzo; Savastano Jr.,Holmer.
The sustainability of intensive swine production demands alternative destinations for the generated residues. Ashes from swine rice husk-based deep bedding were tested as a mineral addition for cement mortars. The ashes were obtained at 400 to 600ºC, ground and sieved through a 325 mesh sieve (# 0.045 mm). The characterization of the ashes included the determination of the index of pozzolanic activity with lime. The ashes were also tested as partial substitutes of Portland cement. The mortars were prepared using a cement:sand proportion of 1:1.5, and with water/cement ratio of 0.4. Three percentages of mass substitution of the cement were tested: 10, 20 and 30%. Mortar performances were assessed at 7 and 28 days determining their compressive strength. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Rice husk; Pozzolanicity; Vitreous silica; Sustainability.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000200001

Advances in Agrobacterium-mediated plant transformation with enphasys on soybean
Provedor de dados: 63
Autores: Mello-Farias,Paulo Celso de; Chaves,Ana Lúcia Soares.
Soybean is one of humanity's major sources of plant protein. It is also very important for animal feed and as industrial raw material. Great advances have recently been achieved in its genetic transformation. This review provides a comprehensive discussion of important factors affecting Agrobacterium-mediated soybean transformation including target tissues, plant tissue health, wounding methods, regeneration systems, selectable markers and reporter genes.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycine max; Embryogenic tissue; Sonication assisted Agrobacterium-mediated transformation (SAAT); Green fluorescent protein (GFP).
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000100014

Water levels and soil mulches in relation to strawberry diseases an yield in a greenhouse
Provedor de dados: 63
Autores: Pires,Regina Célia de Matos; Folegatti,Marcos Vinícius; Tanaka,Maria Aparecida de Souza; Passos,Francisco Antonio; Ambrosano,Gláucia Maria Bovi; Sakai,Emilio.
The occurrence of diseases and its influence on strawberry yield in a greenhouse as well as its association with water management are still not well known. So, the aim of this work was to evaluate the effect of different water levels and soil mulches on strawberry plant health and yield in a greenhouse. The experiment was carried out at Atibaia, State of São Paulo, Brazil, from April to December 1995. The experimental design was a 2 × 3 factorial, in randomized blocks, with five replications, and consisted of two soil mulches and three water levels. The soil mulches consisted of clear or black plastic. Trickle irrigation was applied whenever the soil water potential reached -10, -35 and -70 kPa at a depth of ten centimeters. Cultivar Campinas IAC 2712 was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fragaria × ananassa Duch.; Water management; Trickle irrigation; Disease.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000600003

Sombric-like horizon and xanthization in polychrome subtropical soils from Southern Brazil: implications for soil classification
Provedor de dados: 63
Autores: Chiapini,Mariane; Oliveira Junior,Jairo Calderari de; Schellekens,Judith; Almeida,Jaime Antonio de; Buurman,Peter; Vidal-Torrado,Pablo.
ABSTRACT The occurrence of dark subsurface horizons rich in organic matter (OM) associated with polychrome in the B horizon (yellowish over reddish hue) is common in soils from Southern Brazil. The formation of these horizons and the combination with such morphological attributes has not been properly documented, and neither has the cause effect relationship. Four soil profiles with such sombric-like horizons with a yellowish color at the upper part of the B horizon over red subsoil were studied in Southern Brazil. Results from micromorphology, extractable sesquioxide minerals, clay mineralogy and isomorphic substitution of Fe by Al in iron minerals showed that melanization, xanthization, bioturbation, moderate shrinking/swelling and moderate...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Argissolos; Goethite; Dark subsurface horizon; Shiny peds; Matte aggregate faces.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000401401

Adubação NK no desenvolvimento e na concentração de macronutrientes no florescimento do feijoeiro
Provedor de dados: 63
Autores: Lima,Eduardo do Valle; Aragão,Carlos Alberto; Morais,Otoniel Magalhães; Tanaka,Robson; Grassi Filho,Hélio.
O nitrogênio e o potássio são os elementos mais absorvidos e exportados pelo feijoeiro, sendo a adubação mineral entre os produtores bastante variável quanto as doses aplicadas. Este trabalho avalia os efeitos de doses de N (0, 60, 80, 100 e 120 kg ha-1) e K2O (0, 60 e 120 kg ha-1) no desenvolvimento do feijoeiro, por meio do número de unidades estruturais, peso de material fresco e seco, e a concentração de macronutrientes no florescimento. O experimento foi realizado em Botucatu, SP., em túnel plástico, utilizando-se a cultivar 'Pérola'. Duas plantas foram cultivadas em vasos de 15 L, preenchidos com terra de Latossolo Vermelho Distrófico típico, textura média, por 50 dias. As doses de NK foram parceladas em cobertura aos 20 e 40 dias após semeadura. As...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phaseolus vulgaris; Nitrogênio; Potássio; Nutrição mineral; Matéria seca; Clorofila.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000100019

Simulation of mixed models in augmented block design
Provedor de dados: 63
Autores: Santos,Aladir Horacio; Bearzoti,Eduardo; Ferreira,Daniel Furtado; Silva Filho,João Luís da.
The augmented block design is widely used in breeding programs, with non-replicated treatments generally being selection units, and replicated treatments being standard cultivars. Originally, an intrablock analysis (fixed model) was proposed. Although non-replicated treatments and/or blocks can be considered of random nature, mixed linear models could be used instead. This work evaluated such an approach, using computer simulation. Populations consisted of sets of randomly generated inbred lines. Molecular marker data were also simulated to allow the estimation of the genetic covariance matrix. Different conditions were considered, varying heritability and the coefficient b of Smith of soil heterogeneity. For each condition 100 simulations were performed,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Augmented design; Mixed model; Molecular marker.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000300012

Principles of crop modeling and simulation: I. uses of mathematical models in agricultural science
Provedor de dados: 63
Autores: Dourado-Neto,D.; Teruel,D. A.; Reichardt,K.; Nielsen,D.R.; Frizzone,J. A.; Bacchi,O.O.S.
Modeling techniques applied to agriculture can be useful to define research priorities and understanding the basic interactions of the soil-plant-atmosphere system. Using a model to estimate the importance and the effect of certain parameters, a researcher can notice which factors can be most useful. The modeler should define his objectives before beginning his work and construct a model that fulfills the proposed objectives.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Crop modeling; Simulation.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000500008

Compatibility of conventional agrochemicals used in rice crops with the entomopathogenic fungus Metarhizium anisopliae
Provedor de dados: 63
Autores: Silva,Rodrigo Alves da; Quintela,Eliane Dias; Mascarin,Gabriel Moura; Barrigossi,José Alexandre Freitas; Lião,Luciano Moraes.
The toxicological impact of chemical pesticides on fungal entomopathogens and their use in tank-mixing can be directly measured through in vitro compatibility tests. This study reports the in vitro toxicity of eight insecticides, four fungicides and five herbicides in the conidial germination, vegetative growth and conidiation of Metarhizium anisopliae (strain CG 168). A conidial suspension containing the pesticide at recommended field dosage was subjected to constant agitation in a rotary shaker for 3h to simulate a tank mixing. Then, aliquots of each suspension were used to determine conidial germination, vegetative growth and conidiation on potato dextrose agar (PDA). The fungicides difenoconazole (69 mL ha-1), propiconazole (75 mL ha-1),...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pesticide compatibility; Conidiation; Entomopathogenic fungi; Germination; Vegetative growth.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162013000300003

Organogenesis and transient genetic transformation of the hybrid Eucalyptus grandis × Eucalyptus urophylla
Provedor de dados: 63
Autores: Alcantara,Giovana Bomfim de; Bespalhok Filho,João Carlos; Quoirin,Marguerite.
The hybrid Eucalyptus grandis x Eucalyptus urophylla presents high levels of productivity and potential for use in paper, cellulose and fiber industries. The bud organogenesis from leaf explants of two clones of E. grandis × E. urophylla was studied in order to verify the effect of several factors: subculture duration on multiplication medium, type of explants, entire and half leaves: basal and apical portions, and duration of the culture on a regeneration medium. Differences in organogenic capacity of the two clones tested were observed. The explant most recommended for organogenesis is the basal section of the leaf collected from shoot clusters subcultured every 17 days. Moreover, the leaf explants must be transferred to a fresh bud induction medium...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Agrobacterium tumefaciens; Micropropagation; Tissue culture; Transgenic plant; Woody species.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000200016

ISOENZYMATIC POLYMORPHISM AND ACTIVITY OF PEROXIDASES OF COMMON BEAN  (Phaseolus vulgaris L.) UNDER SALINE STRESS
Provedor de dados: 63
Autores: BROETTO,F.; CASA,A.M.; MALAVOLTA,E.; LOPES,C.R.
One of the uses of the technique of tissue culture for plant breeding is the identification of cell lines tolerant to salt stress.In order to study the biochemical mechanisms involved in the genetic expression to salt tolerance, callus from embryo axis of four bean cultivars (cv. IAC-carioca; cv. IAPAR-14; cv. JALO-EEP558; CV. BAT-93) were grown in Murashige &amp;amp; Skoog (1962) medium, supplemented with NaCl in the concentrations of 0, 20, 40, 60 and 80 mM. After 14 days callus were harvested and analyzed according to their isoenzymatic patterns and peroxidase activities. BAT and IAPAR cultivars showed two common activity zones in the anodic region, with only one specific enzymatic band to each one (the two fastest migration band); it is possible that...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phaseolus vulgaris; Peroxidases; Polymorphism; Salt stress; Phaseolus vulgaris.
Ano: 1997
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161997000200003

Desverdecimento e Conservação em Pós-Colheita de Frutos de Kunquat (Fortunella margarita, Swingle) em Resposta a Tratamentos com Ethephon e Cera
Provedor de dados: 63
Autores: MOTA,R.V. da; BASSINELLO,P.Z.; MELOTTO,E.; CASTRO,P.R.C.
Este trabalho teve por finalidade verificar o efeito da aplicação de cera e de vários níveis de ethephon no desverdecimento e na conservação em pós-colheita de frutos de kunquat. Os frutos, colhidos no ponto de quebra de cor, foram tratados com soluções de ethephon a 250, 500 e 1000 ppm acrescidas de 0,3 ppm de Agral, ou encerados com Stafresh. Os frutos foram selecionados visualmente por tamanho e cor e após o tratamento, foram armazenados a temperatura ambiente (26°C ± 1°C, 50 a 60% UR). Foram feitas avaliações diárias quanto a perda de peso, textura, sólidos solúveis totais (°Brix), e degradação da clorofila. Todos os tratamentos com ethephon promoveram a degradação da clorofila. A taxa de desverdecimento aumentou proporcionalmente ao aumento na...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fortunella margarita; Desverdecimento; Conservação.
Ano: 1997
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161997000200020

Arsenic phytoextraction and hyperaccumulation by fern species
Provedor de dados: 63
Autores: Gonzaga,Maria Isidoria Silva; Santos,Jorge Antonio Gonzaga; Ma,Lena Qiying.
Arsenic (As) is an ubiquitous trace metalloid found in all environmental media. Its presence at elevated concentrations in soils derives from both anthropogenic and natural inputs. Arsenic is a toxic and carcinogenic element, which has caused severe environmental and health problem worldwide. Technologies currently available for the remediation of arsenic-contaminated sites are expensive, environmentally disruptive, and potentially hazardous to workers. Phytoextraction, a strategy of phytoremediation, uses plants to clean up contaminated soils and has been successfully applied to arsenic contaminated soils. It has the advantage of being cost-effective and environmentally friendly. A major step towards the development of phytoextraction of arsenic-impacted...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Environmental contamination; Hyperaccumulator plants; Phytoremediation.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000100015

Erratum
Provedor de dados: 63
Tipo: Info:eu-repo/semantics/other
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000200017

CARACTERÍSTICAS AGRONÔMICAS E DIGESTIBILIDADE "IN SITU" DA FRAÇÃO VOLUMOSA DE HÍBRIDOS DE MILHO PARA SILAGEM
Provedor de dados: 63
Autores: Silva,Luís Felipe Prada e; Machado,Paulo Fernando; Francisco Júnior,José Carlos de; Donizetti,Melchiades T.
Estudou-se as características agronômicas, composição química, e a digestibilidade "in situ" da matéria seca da fração volumosa de 28 híbridos de milho em 1995/96, e de 21 híbridos de milho em 1996/97, com o objetivo de se avaliar a variabilidade e consistência genética de parâmetros de qualidade para seleção de híbridos de milho para silagem. Observou-se a existência de variabilidade genética para todos os parâmetros analisados, no entanto, houve grande efeito ambiental sobre os parâmetros de qualidade dos híbridos de milho. A interação híbrido X ano experimental foi significativa para as características agronômicas, bem como para a digestibilidade da fração volumosa, porém a interação não foi significativa para o teor de FDA da fração volumosa. A...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Milho para silagem; Híbrido; Digestibilidade "in situ".
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000100024

Kinetics of phosphorus uptake and root morphology of local and improved varieties of maize
Provedor de dados: 63
Autores: Machado,Cynthia Torres de Toledo; Furlani,Ângela Maria Cangiani.
Interspecific and intraspecific differences in the efficiency of utilization of soil phosphorus (P) are explained, in part, by plant morphological and physiological variations, which characterize the plant for nutrient acquisition. As part of a study on maize genotypes characterization for P-uptake and use efficiency, kinetic parameters of P uptake and root morphological characters were evaluated for six local and improved maize varieties, grown in nutrient solution. The kinetic parameters related to P influx were: maximal transport rate (Vmax), the Michaelis-Menten constant (Km), and the external concentration when net uptake is zero (Cmin). Measured root morphological characters were: root length, radius, and surface area. Shoot and root dry matter yield...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Genetic variability; Phopshorus acquisition; Kinetics parameters; Root system; Nutritional efficiency.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000100012

Trellis systems, rootstocks and season influence on the phenolic composition of ‘Chenin Blanc’ grape
Provedor de dados: 63
Autores: Costa,Rayssa Ribeiro da; Rodrigues,Antônio Augusto Marques; Vasconcelos,Victor Alexandre Freire de; Costa,João Paulo Dias; Lima,Maria Auxiliadora Coêlho de.
ABSTRACT: The biosynthesis of phenolic compounds might be influenced by environmental factors, such as solar radiation, temperature and relative air humidity, and production system. Some components of the production system, particularly the trellis system and rootstock, might change the phenolic composition of grapes due to microclimate of the cultivation region. In this study, the phenolic profile of ‘Chenin Blanc’ grapes was characterized with different trellis systems and rootstocks in two consecutive production cycles by using high-performance liquid chromatography under tropical semi-arid conditions. In the second production cycle (Jan-May/2016), accumulation of (-) - epicatechin gallate and (-) - epigallocatechin gallate was higher when vigorous...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vitis vinifera L.; Phenolic acids; Flavonoids; Stilbenes; Tropical vitiviniculture.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000301300

Spatial distribution of Pseudaletia sequax Franclemlont in triticale under no-till management
Provedor de dados: 63
Autores: Grego,Célia Regina; Vieira,Sidney Rosa; Lourenção,André Luiz.
The knowledge of the spatial distribution of insect populations in crops allows the estimation of the population density in space, the classification of damage impact on yield as well as decisions to be made about control measures. To evaluate the spatial distribution of the wheat armyworm Pseudaletia sequax Franclemont, in relation to the development and yield of triticale (Triticum secale Wittmack) under no-till management, samplings were taken at 302 points in a square grid measuring 10 x 10 m, in Campinas, SP, Brazil. The caterpillar population was evaluated by counting their number per meter at the base of triticale plants. Grain yield (kg ha-1), cover of the above-ground part (kg ha-1), mean plant height (m), and ground cover percentage were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Triticum secale Wittmack; Insecta; Wheat armyworm; Geostatistics; Indicator kriging.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000400002

Use of the software Seed Vigor Imaging System (SVIS®) for assessing vigor of carrot seeds
Provedor de dados: 63
Autores: Marchi,José Luís de; Cicero,Silvio Moure.
ABSTRACT Seed vigor has traditionally been evaluated by physiological, biochemical and stress tolerance tests. More recently, with the use of computerized image analysis, objective information has become accessible in a relatively short period of time, with less human interference. The aim of this study was to verify the efficiency of computerized seedling image analysis by Seed Vigor Imaging System (SVIS®) to detect differences in vigor between carrot (Daucus carota L.) seed lots as compared to those provided by traditional vigor tests. Seeds from seven lots from the Brasilia cultivar were subjected to a germination test, first count of germination, speed of germination, accelerated aging with saline solution and seedling emergence; furthermore, a vigor...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Daucus carota L.; Daucus carota subsp. Sativus; Quality control; Physiological potential; Seed analysis.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162017000600469

Resposta de cultivares de pimenta-do-reino aos nutrientes NPK em um Latossolo Amarelo da Amazônia Oriental
Provedor de dados: 63
Autores: Veloso,Carlos Alberto Costa; Carvalho,Eduardo Jorge Maklouf; Malavolta,Eurípedes; Muraoka,Takashi.
O presente trabalho foi desenvolvido, com o objetivo de estabelecer curvas de resposta da pimenteira-do-reino a nitrogênio, fósforo e potássio, num Latossolo Amarelo distrófico (Oxisol), no município de Senador José Porfírio, km 35 da rodovia Transamazônica. As doses de nitrogênio, aplicadas manualmente a cada ano foram: (0; 40; 80; 120 e 160 kg ha-1 de N) na forma de uréia, cinco doses de fósforo (0; 30; 60; 90 e 120 kg ha-1 P2O5) na forma de superfosfato triplo e cinco doses de potássio (0; 30; 60; 90 e 120 kg ha-1 K2O) na forma de KCl. Utilizou-se o delineamento em blocos ao acaso, com três repetições, sendo os tratamentos dispostos em esquema fatorial incompleto.O espaçamento foi de 3,0 m entre linhas e 2,5 m entre plantas, com seis plantas úteis por...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Piper nigrum; Adubação; Nitrogênio; Fósforo; Potássio.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000200023

Data processing within rows for sugarcane yield mapping
Provedor de dados: 63
Autores: Maldaner,Leonardo Felipe; Molin,José Paulo.
ABSTRACT: The mapping of sugarcane yield is still not as widely available as it is for grain crops. Sugarcane harvesters cut and process the cane in a single or maximum of two rows, facilitating the monitoring of cane yield and its behavior on a small scale. This study tested a method for sugarcane yield data cleaning, investigating if the data recording frequency influences the characterization of yield variations in mapping high-resolution spatial data within a single row. Four data sets from yield monitors of single row harvesting were used. A cleaning process with global and anisotropic filtering in a single sugarcane row was applied. The local outlier cleaner compares the yield value of a point with its nearest neighbors within the same row. Even...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Yield monitor; Sugarcane variability; Line maps.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000500101

New approaches to seed vigor testing
Provedor de dados: 63
Autores: Marcos-Filho,J.
Among the principles used for the evaluation of seed vigor, two approaches are predominant: seed resistance to stresses and the direct or indirect identification of the "current" state of the seeds, e.g., enzymatic activity, integrity of the cellular membranes, growth parameters. In this presentation recent innovations are discussed in procedures for seed vigor evaluation emphasizing the methodologies of accelerated aging with salt saturated solutions, controlled deterioration and potassium leachate tests. These tests, performed at seed the laboratory of ESALQ/USP, in function of their simplicity and efficiency, deserve the attention of seed technologists.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Seed testing; Vigor accelerated aging controlled deterioration potassium leachate.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000500005

Transpiration and leaf growth of potato clones in response to soil water deficit
Provedor de dados: 63
Autores: Souza,André Trevisan de; Streck,Nereu Augusto; Heldwein,Arno Bernardo; Bisognin,Dilson Antonio; Winck,José Eduardo Minussi; Rocha,Thiago Schmitz Marques da; Zanon,Alencar Junior.
Potato (Solanum tuberosum ssp. Tuberosum) crop is particularly susceptible to water deficit because of its small and shallow root system. The fraction of transpirable soil water (FTSW) approach has been widely used in the evaluation of plant responses to water deficit in different crops. The FTSW 34 threshold (when stomatal closure starts) is a trait of particular interest because it is an indicator of tolerance to water deficit. The FTSW threshold for decline in transpiration and leaf growth was evaluated in a drying soil to identify potato clones tolerant to water deficit. Two greenhouse experiments were carried out in pots, with three advanced clones and the cultivar Asterix. The FTSW, transpiration and leaf growth were measured on a daily basis, during...
Tipo: Info:eu-repo/semantics/article
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162014000200002

Clay mineralogy and magnetic susceptibility of Oxisols in geomorphic surfaces
Provedor de dados: 63
Autores: Camargo,Livia Arantes; Marques Júnior,José; Pereira,Gener Tadeu; Bahia,Angélica Santos Rabelo de Souza.
Studies analyzing the variability of clay minerals and magnetic susceptibility provide data for the delineation of site-specific management areas since many of their attributes are important to agronomy and the environment. This study aimed to evaluate the spatial variability of clay minerals, magnetic susceptibility, adsorbed phosphorus and physical attributes in Oxisols of sandstones in different geomorphic surfaces. For that purpose, soil samples were collected every 25 m along a transect located within the area where the geomorphic surfaces were identified and mapped. The transect occupied the central portion of 500 ha, where it was also sampled for density purposes with one sample per six hectares. Soil samples were collected at a depth of 0.0-0.2 m....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Goethite; Hematite; Gibbsite; Kaolinite; Soil mapping.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162014000300010

Cashew cultivation in Guinea-Bissau – risks and challenges of the success of a cash crop
Provedor de dados: 63
Autores: Catarino,Luís; Menezes,Yusufo; Sardinha,Raul.
In recent decades a boom in cashew (Anacardium occidentale)cultivation has taken place in Guinea-Bissau, leading to the replacement of traditional slash-and-burn agriculture by a cash crop. As a result, the country is currently one of the world’s largest producers of raw cashew nuts and the cashew sector has acquired enormous importance in Guinea-Bissau’s economy. Changes induced by the cashew boom at social and environmental levels are yet to be analyzed and understood. The present study provides an account of the process of cashew expansion in Guinea-Bissau, reviews the current situation and discusses its future prospects. The cashew tree was introduced into the country by the Portuguese in the XIXth century, but only effectively expanded in the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: West Africa; Agroforestry systems; Cashew nut; Tree crops.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162015000500459

Efeito de doses de calcário e de gesso na cultura do feijoeiro (Phaseolus vulgaris L.) cv. carioca-80
Provedor de dados: 63
Autores: MORAES,J.F.L.; BELLINGIERI,P.A.; FORNASIERI FILHO,D.; GALON,J.A.
Instalou-se em um latossolo vermelho-escuro, textura média, de Jaboticabal, S.P. um experimento cujo objetivo foi avaliar a influência de doses de gesso e de calcário sobre as características químicas do solo, agronômicas e tecnológicas da cultura do feijoeiro. Utilizou-se o delineamento em blocos casualizados em um esquema fatorial 3 x 4, representado por três doses de calcário (0; 1,4 e 2,8 t/ha) e quatro doses de gesso (0, 130, 260 e 390 kg/ha) com três repetições. Verificou-se que: o uso do calcário provocou aumento nos teores do Mg trocável do solo, nos valores de pH e de V% e diminuição dos valores de H + Al; o fornecimento de gesso ocasionou a lixiviação do K trocável da camada superficial para a camada 20-40cm do solo; os teores foliares de Mg+2...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Feijão; Calcário; Gesso.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000300012

MATURIDADE DE COMPOSTO DE LIXO URBANO
Provedor de dados: 63
Autores: Jahnel,Marcelo Cabral; Melloni,Rogerio; Cardoso,Elke J. B. N.
O processo de compostagem de lixo pré-digerido, produzido na Usina de Compostagem de Vila Leopoldina do município de São Paulo acondicionado em cestos telados, foi avaliado através das variáveis: pH, P total, temperatura, produção de CO2, matéria orgânica e N total durante um período de 52 dias. O lixo foi de 1 m de diâmetro por 1,5 m de altura, revolvido e umedecido semanalmente. Ao final do período estudado, as variáveis produção de CO2, temperatura, matéria orgânica total e relação C/N apresentaram seus valores reduzidos, enquanto o pH e os teores de N e de P total atingiram seus valores máximos. Os dados permitiram concluir que o período avaliado foi suficiente para a maturação do composto de lixo.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Composto; Compostagem; Lixo; Maturação.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000200007

Tomato yellow vein streak virus: relationship with Bemisia tabaci biotype B and host range
Provedor de dados: 63
Autores: Firmino,Ana Carolina; Yuki,Valdir Atsushi; Moreira,Adriana Gonçalves; Rezende,Jorge Alberto Marques.
The Tomato yellow vein streak virus (ToYVSV) is a putative species of begomovirus, which was prevalent on tomato crops in São Paulo State, Brazil, until 2005. The objectives of this study were to evaluate the interaction between ToYVSV and its vector Bemisia tabaci biotype B and to identify alternative hosts for the virus. The minimum acquisition and inoculation access periods of ToYVSV by B. tabaci were 30 min and 10 min, respectively. Seventy five percent of tomato-test plants were infected when the acquisition and inoculation access periods were 24 h. The latent period of the virus in the insect was 16 h. The ToYVSV was retained by B. tabaci until 20 days after acquisition. First generation of adult whiteflies obtained from viruliferous females were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Solanum lycopersicon; Geminivirus; Begomovirus; Aleyrodidae; Transmission.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000600011

First record of damage by an insect pest in a commercial amaranth crop in Brazil
Provedor de dados: 63
Autores: Oliveira,Charles Martins de; Ribeiro Júnior,Walter Quadros; Camargo,Amabilio José Aires de; Frizzas,Marina Regina.
Insect pests have not been recorded for amaranth (Amaranthus cruentus L.) in Brazil. Generalized plant lodging was observed after the grain-filling period in an irrigated commercial amaranth crop (7 ha), located in Cristalina, state of Goiás (Brazil), which was cultivated between Aug. and Dec. 2009. Almost all sampled plants presented internal galleries bored by lepidopteran larvae. The larvae were reared, and the adults were identified as Herpetogramma bipunctalis (F.) (Crambidae). This is the first report of an insect pest causing significant damage in a commercial amaranth crop in Brazil, which indicates the need to develop pest management strategies in order to support the increased production in Brazil.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Herpetogramma bipunctalis; Amaranthus; Lepidoptera; Crambidae; “Cerrado”.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162012000400006

Breakdown of resistance in sweet pepper against Pepper yellow mosaic virus in Brazil
Provedor de dados: 63
Autores: Gioria,Ricardo; Braga,Renato de Souza; Krause-Sakate,Renate; Roullier,Caroline; Rosa,Daniel Dias; Moura,Monika Fecury; Souza-Dias,José Alberto Caram de; Sawazaki,Haiko Enok; Camargo,Luis Eduardo Aranha; Rezende,Jorge Alberto Marques.
Plants of Capsicum annuum cv. Magali R, resistant to Pepper yellow mosaic virus (PepYMV), which showed severe yellow mosaic, leaf malformation and stunting were observed during the 2003/04 growing season in Lins, São Paulo State, Brazil. Potyvirus-like particles observed in leaf sap from infected plants under the electron microscope reacted with an antiserum against PepYMV in PTA-ELISA. In addition to C. annuum cv. Magali R, this potyvirus also infected systemically the resistant C. annuum cv. Rubia R. The nucleotide sequence of part of the CP gene of this potyvirus shared 96-98% identity with that of other PepYMV isolates. The partial nucleotide sequence of the 3' NTR showed 94-96% identity with that of PepYMV. These data indicate that this potyvirus is a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Potyvirus; RT-PCR; ELISA; Resistance gene.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000200017

Quality characteristics of Longissimus dorsi muscle from Bos indicus animals treated with vitamin D3
Provedor de dados: 63
Autores: Pedreira,Aparecida Carla de Moura Silveira; Luchiari Filho,Albino; Leite,Vanderley Benedito de Oliveira; Carvalho,Marina Hojaij.
Among several techniques to improve beef tenderness, vitamin D3, important for calcium mobilization, has recently been developed as an alternative. It acts on the intracellular calcium-dependent proteases (mu- and m-calpain). Ten days prior to slaughter, 36 Nelore steers were fed 0, 3, 6 and 9 million IU of supplemental vitamin D3 (D3) per animal per day (an-1 d-1). Animals were slaughtered and tenderness (shear force), cooking losses (1, 8 and 15 days of aging), sensory evaluation, and minerals in blood plasma and muscle (Longissimus dorsi) were measured. There were no differences (P &gt; 0.05) among treatments for blood plasma and muscle mineral concentration, evaporation losses, and sensory juiciness. For drip and total loss, the smallest losses were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nelore cattle; Meat tenderness; Carcass characteristics.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000400005

Influência do cloreto de cálcio no crescimento de explantes de Gypsophila paniculata L. (Caryophyllaceae), cultivados in vitro
Provedor de dados: 63
Autores: Jun Takane,R.; Minami,K.; Lucchesi,A.A.; Almeida,M. De.
Este trabalho teve por finalidade verificar a influência do Cloreto de Cálcio (CaCl12) no crescimento de explantes de Gypsophila paniculata L., cultivados em meio de cultura a fim de fornecer subsídios para a micropropagação desta cultura. Foram utilizados como explantes somente as gemas apicais das plantas em fase de crescimento vegetativo. Os explantes foram inoculados em meio de cultura MS (Murashigue &amp;amp; Skoog) modificado com diferentes concentrações de CaCl2: a) 440; b) 880; c) 1.760; d) 2.640 e e) 3.520 mg/1. Os explantes foram deixados em câmara de crescimento sob uma temperatura constante de 25°C ± 2°C sob fotoperíodo de 16 horas. Os explantes do meio de cultura MS com 1.760 mg/1 de CaCl2 foram os de melhor resultado, com crescimento vigoroso...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gypsophila paniculata L.; Micropropagação; Gemas apicais; Cloreto de cálcio.
Ano: 1994
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000200006

Muskmelon seed priming in relation to seed vigor
Provedor de dados: 63
Autores: Nascimento,Warley Marcos; Aragão,Fernando Antônio Souza de.
A number of important factors may affect seed priming response, including seed quality. Effects of seed vigor on seed priming response were investigated using seed lots of two muskmelon (Cucumis melo L.) cultivars. Seeds of muskmelon, cvs. Mission and Top Net SR were artificially aged at 43°C for 0, 20 and 40 hours. Seeds were primed for six days in darkness at 25°C in KNO3 (0.35 mol L-1) aerated solution. Aged seeds germinated poorly at 17°C. Priming increased germination rate at 17 and 25°C and germination percentage at 17°C. An interaction effect on germination performance between vigor and priming was observed, especially at low temperature. Priming increased germination performance in seeds of low vigor, and the response was cultivar dependent.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Germination; Osmoconditioning; Cultivars; Stand establishment.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000100019

Feeding effects of cottonseed and its co-products on the meat proteome from ram lambs
Provedor de dados: 63
Autores: Paim,Tiago do Prado; Viana,Pauline; Tilburg,Mauricio Fraga van; Moura,Arlindo de Alencar; Souza,Jurandir Rodrigues de; McManus,Concepta; Abdalla,Adibe Luiz; Louvandini,Helder.
ABSTRACT: Gossypol easily pairs with lysine side chains and enzymes involved in the cellular growth process. The effect of gossypol (a compound present in cotton co-products) in ruminant metabolism and meat quality is not yet clear. This study was undertaken in order to evaluate the effects of cotton co-products in lamb muscle proteome. Twenty-four Santa Inês ram lambs, 5-months old (20.6 ± 1.9 kg), were randomly assigned to four treatments: control (without cottonseed), whole cottonseed, cottonseed meal and high oil cottonseed meal. At 95 days into the experiment, lambs were slaughtered and samples from Longissimus dorsi were collected. Proteins were extracted and analyzed by 2-D electrophoresis. Spots showing a significant effect from the treatment (the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gossypol; Dehydrogenase; Skeletal muscle; Sheep; Feedlot.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162019001600463

Work organization and technological resources in broiler production: an ergonomics approach
Provedor de dados: 63
Autores: Dinten,Carolina Alexandra Marchant; Abrahão,Roberto Funes; Oliveira,Julieta Teresa Aier de.
Ergonomic Work Analysis has made it possible to identify the main factors behind the difficulties encountered by workers in (routinely) performing their tasks. The purpose of this work was studying the relationship between the forms of work organization, the technology used in broiler production, and the impacts of both factors on this type of work from an ergonomics perspective. Both teamwork and cooperation among workers were proven to help minimizing efforts and achieving better results. If on one hand higher technological level adopted could elicit using a smaller number of workers as well as make broiler handling easier and more effective/precise, on the other hand it generated sub-tasks and made equipment operation much more dependent upon close...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ergonomic work analysis; Broiler handling; Teamwork; Familial workforce.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000100008

Cultivo de Brachiaria brizantha Stapf. cv. Marandu em solução nutritiva com omissões de macronutrientes
Provedor de dados: 63
Autores: Monteiro,F.A.; Ramos,A.K.B.; Carvalho,D.D. De; Abreu,J.B.R. de; Daiub,J.A.S.; Silva,J.E.P. Da; Natale,W.
Em experimento de casa de vegetação, cultivou-se Brachiaria brizantha Stapf. cv. Marandu em solução nutritiva, tendo como tratamentos a solução completa, as omissões individuais de N, P, K, Ca, Mg, S e a testemunha (com omissão dos macronutrientes). Fez-se o acompanhamento da manifestação dos sintomas visuais de deficiência e, 50 dias após o transplante, avaliou-se a produção de matéria seca (MS), número de perfilhos (NP), a altura das plantas (H), bem como a composição mineral da parte aérea e das raízes. As omissões de N e P limitaram o crescimento, ao passo que a omissão de K não afetou a produção de MS e NP. A omissão de Ca não trouxe, para o período considerado, restrições na produção de MS, NP e H. Nas omissões de Mg e S as plantas tiveram fraco...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brachiaria brizantha; Nutrição mineral; Macronutrientes; Solução nutritiva; Gramínea forrageira.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000100022

Nickel adsorption by soils in relation to pH, organic matter, and iron oxides
Provedor de dados: 63
Autores: Mellis,Estêvão Vicari; Cruz,Mara Cristina Pessôa da; Casagrande,José Carlos.
There is little information on nickel adsorption by Brazilian soils. The objective of this experiment was to determine the effect of pH, organic matter, and iron oxides on nickel adsorption by three soils: a clayey Anionic "Rhodic" Acrudox, a sandy clay loam Anionic "Xanthic" Acrudox, and a clayey Rhodic Hapludalf. Soil samples were collected from the 0-0.2 m layer and treated to eliminate organic matter and iron oxides. The nickel adsorption was evaluated in the original samples and in those treated to remove organic matter and to remove both, organic matter and iron oxides, using 2 g soil + 20 mL of 0.01 mol L-1 CaCl2 solution containing 5 mg L-1 Ni, pH varying from 3.5 to 7.5. The nickel adsorption decreased with the elimination of organic matter. For...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ni adsorption; Tropical soils.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000200011

Minimizing inter-genotypic competition effects to predict genetic values and selection in forestry genetic tests
Provedor de dados: 63
Autores: Pavan,Bruno Ettore; Paula,Rinaldo César de; Perecin,Dilermando; Candido,Liliam Silvia; Scarpinati,Edimar Aparecido.
The effect of competition is an important source of variation in breeding experiments. This study aimed to compare the selection of plants of open-pollinated families of Eucalyptus with and without the use of competition covariables. Genetic values were determined for each family and tree and for the traits height, diameter at breast height and timber volume in a randomized block design, resulting in the variance components, genetic parameters, selection gains, effective size and selection coincidence, with and without the use of covariables. Intergenotypic competition is an important factor of environmental variation. The use of competition covariables generally reduces the estimates of variance components and influences genetic gains in the studied...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Eucalyptus spp.; Covariable analysis; Selection gains.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000600011

Spore density and root colonization by arbuscular mycorrhizal fungi in preserved or disturbed Araucaria angustifolia (Bert.) O. Ktze. ecosystems
Provedor de dados: 63
Autores: Moreira,Milene; Baretta,Dilmar; Tsai,Siu Mui; Cardoso,Elke Jurandy Bran Nogueira.
Araucaria angustifolia (Bert.) O. Ktze., a native forest tree from Brazil, is under extinction risk. This tree depends on arbuscular mycorrhizal fungi for growth and development, especially in tropical low-P soils but, despite being a conifer, Araucaria does not form ectomycorrhiza, but only the arbuscular endomycorrhiza. This study aimed at surveying data on the spore density and root colonization (CR) by arbuscular mycorrhizal fungi (AMF) in Araucaria angustifolia forest ecosystems, in order to discriminate natural, implemented, and anthropic action-impacted ecosystems, by means of Canonical Discriminant Analysis (CDA). Three ecosystems representative of the Campos do Jordão (SP, Brazil) region were selected: 1. a native forest (FN); 2. a replanted...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brazil pine; Biodiversity; Species richness; Reforestation.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000400009

Acurácia do modelo univariado para análise de medidas repetidas por simulação multidimensional
Provedor de dados: 63
Autores: Xavier,Lara Hoffmann; Dias,Carlos Tadeu dos Santos.
Em experimentos com medidas repetidas, quando se utiliza o esquema de parcelas subdivididas, o teste F com relação à subparcela, só terá distribuição F exata caso a matriz de covariâncias atenda a condição de esfericidade. O objetivo deste trabalho foi verificar por meio de simulações, a acurácia da análise através da observação de casos em que a matriz de covariâncias atende, ou não, à condição de esfericidade. Quando utilizadas as matrizes de covariâncias do tipo componente de variância e simetria composta, que atendem a condição de esfericidade, a acurácia da análise foi satisfatória. O mesmo não ocorreu com outras estruturas da matriz de covariâncias. Com relação aos efeitos dos parâmetros, dependendo da grandeza dos valores dos efeitos, estes...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Medidas repetidas; Matriz de covariâncias; Simulação; Acurácia.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000200005

Phenology and reproductive traits of peaches and nectarines in Central-East Argentina
Provedor de dados: 63
Autores: Gariglio,Norberto Francisco; Mendow,Marisa; Weber,Marcela Emilce; Favaro,María Alejandra; González-Rossia,Diego Esteban; Pilatti,Rubén Andrés.
In Santa Fe, the central-east area of Argentina, the expansion of fruit tree crops requires the introduction and evaluation of low chilling varieties. The aims of this study was to characterize the phenological behaviour and the reproductive traits of peach (Prunus persica L. Batsch) and nectarine varieties with chilling requirements ranging from 150 to 650 chilling hours (CH). Low chilling varieties (&lt; 450 CH) had higher flower density (22.0-56.5 flowers m-1), fruit set (26.0-56.7%), fruit yield (9.3-36.6 kg per plant), and low coefficient of fruit yield variability than varieties with a higher chilling requirement (&gt;500 CH). The phenology of high chilling requirement varieties had the advantage that blooming and fruit set happened after the period...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: BBCH scale; Stone fruits; Flower intensity; Fruit yield; Low chilling requirement.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000600006

Growth rate and nutritional status of an organic coffee cropping system
Provedor de dados: 63
Autores: Ricci,Marta dos Santos Freire; Alves,Bruno José Rodrigues; Miranda,Simone Cordeiro de; Oliveira,Fabio Freire de.
In view of the low N concentration in organic fertilizers, it is necessary to use high rates of such fertilizers to attend coffee crop requirements. Hence, N is the most limiting nutrient for organic coffee production. The objective of this work was to evaluate the influence of sunn hemp (Crotalaria juncea) organic fertilization on the growth and nutritional status of coffee cultivars, as well as to quantify plant biomass and N input derived from biological nitrogen fixation, and their effect on soil chemical characteristics. The experiment consisted of six coffee (Coffea arabica) cultivars intercropped with and without sunn hemp sown in November 2001 and pruned at mid-height 76 days later. At 175 days, the standing biomass of the legume was cut, measuring...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coffea arabica; Crotalaria juncea; Biological nitrogen fixation; Nutrient input; Green manure.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000200008

Quality and sensorial characteristics of osmotically dehydrated mango with syrups of inverted sugar and sucrose
Provedor de dados: 63
Autores: Bernardi,Sabrina; Bodini,Renata B.; Marcatti,Bruna; Petrus,Rodrigo Rodrigues; Favaro-Trindade,Carmen Sílvia.
Osmotic dehydration is becoming more popular as a complementary treatment in the processing of dehydrated foods, since it presents some advantages such as minimising heat damage to the colour and flavour, inhibiting enzymatic browning and thus dispensing the addition of sulphite and, mainly, reducing energy costs. The objective of the present study was to evaluate the effect of using inverted sugar and sucrose syrups as osmotic agents in the dehydration of mango. The conditions used in the dehydration process were: syrup/fruit ratio of 3:1 (v/w); temperature of 45ºC and constant stirring. The in natura and osmo-dehydrated fruits were evaluated in relation to pH, moisture content, water activity (a w) and soluble solids (ºBrix). Solids incorporation and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mangifera indica; Sensory acceptance; Loss in mass; Solids incorporation.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000100005

The effects of trace elements, cations, and environmental conditions on protocatechuate 3,4-dioxygenase activity
Provedor de dados: 63
Autores: Silva,Andréa Scaramal da; Jacques,Rodrigo Josemar Seminoti; Andreazza,Robson; Bento,Fátima Menezes; Camargo,Flávio Anastácio de Oliveira.
Phenanthracene is a highly toxic organic compound capable of contaminating water and soils, and biodegradation is an important tool for remediating polluted environments. This study aimed to evaluate the effects of trace elements, cations, and environmental conditions on the activity of the protocatechol 3,4-dioxygenase (P3,4O) enzyme produced by the isolate Leifsonia sp. in cell-free and immobilized extracts. The isolate was grown in Luria Bertani broth medium (LB) amended with 250 mg L-1 of phenanthrene. Various levels of pH (4.0-9.0), temperature (5-80 °C), time (0-90 min), trace elements (Cu2+, Hg2+ and Fe3+), and cations (Mg2+, Mn2+, K+ and NH4+) were tested to determine which conditions optimized enzyme activity. In general, the immobilized extract...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Enzyme activity; Enzyme immobilization; Biodegradation; Waste treatment.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162013000200002

Yield components as indicators of drought tolerance of sugarcane
Provedor de dados: 63
Autores: Silva,Marcelo de Almeida; Silva,Jorge Alberto Gonçalves da; Enciso,Juan; Sharma,Vivek; Jifon,John.
Water deficit is one of the major factors limiting the production of sugarcane (Saccharum officinarum L.). A study of the effects of limited water condition on yield components and their relationship with productivity can aid breeding programs in selecting for high yielding genotypes under this condition. The objective of this study was to investigate the relationships among the parameters stalk number, stalk height, stalk diameter, and stalk weight with cane yield in sugarcane growing in a field under moderate water stress during its grand growth period, in order to provide information to help breeders in adopting traits for selecting drought tolerant varieties. Seventy-eight genotypes plus two controls, one drought-tolerant and one drought-susceptible,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Saccharum spp.; Biometric attributes; Productivity; Water stress; Genotypes.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000600008

Microflora fúngica de sementes de milho em ambientes de armazenamento
Provedor de dados: 63
Autores: Tanaka,Maria Aparecida de Souza; Maeda,Jocely Andreuccetti; Plazas,Isabel Helena de Almeida Zeituni.
Durante o armazenamento, vários fungos podem permanecer associados às sementes de milho, causando deterioração ou se mantendo viáveis, infectando posteriormente a plântula. Objetivou-se neste trabalho verificar a sobrevivência de fungos associados às sementes de milho durante 12 meses de armazenamento, em câmara fria (14ºC; 40% UR) e em ambiente não controlado. Observaram-se com maior freqüência os fungos de campo Alternaria alternata, Bipolaris maydis, Cephalosporium acremonium, Cladosporium herbarum, Fusarium moniliforme e Rhizoctonia solani, além de Rhizopus spp. e Trichoderma spp., cuja sobrevivência decresceu ao longo do armazenamento, de modo muito mais acentuado em condição de ambiente não controlado, em comparação à câmara fria. Aspergillus e...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays; Patologia de sementes; Armazenamento; Fungos.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000300011

Microsatellite analysis of pacu broodstocks used in the stocking program of Paranapanema River, Brazil
Provedor de dados: 63
Autores: Povh,Jayme Aparecido; Ribeiro,Ricardo Pereira; Lopera-Barrero,Nelson Mauricio; Jacometo,Carolina Bespalhok; Vargas,Lauro; Gomes,Patrícia Cristina; Lopes,Taís da Silva.
Monitoring the genetic diversity has fundamental importance for fish stocking programs. This experiment aims to evaluate the genetic diversity in two hatchery stations (A and B) with pacu Piaractus mesopotamicus (Holmberg, 1887) in Andirá, state of Paraná, Brazil used in stocking programs of Paranapanema River. Six microsatellite loci were amplified using DNA extracted from 60 fin-clipping samples. The broodstock B had the average number of alleles and the mean heterozygosity (alleles: 3.7 and H O: 0.628) higher than the broodstock A (alleles: 3.5 and H O: 0.600). Alleles with low frequency levels were observed in the both broodstocks. The positive coefficients of endogamy in the locus Pme2 (broodstock A: F IS = 0.30 and broodstock B: F IS = 0.20), Pme5...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Piaractus mesopotamicus; Genetic variability; Hatchery stations; Molecular markers.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000300006

Cadmium phytoavailability in soils and evaluation of extractant effectiveness using an isotope technique
Provedor de dados: 63
Autores: Guerra,Fernando; Trevizam,Anderson Ricardo; Fior,Rafael Carvalho; Muraoka,Takashi.
Large areas of land are nowadays contaminated by heavy metals and, it is therefore, important to monitor their levels in soils. Vegetables act as transfer mechanisms of such contaminants from soils to higher levels in the food chain. In this study, we aimed to evaluate the effectiveness of chemical extractants by the L-value method for Cd phytoavailability using the 109Cd radionuclide. In a greenhouse experiment, rocket plants (Eruca sativa L.) were cultivated in pots with samples from Typic Hapludox and Typic Quartzipsamment soils. Cadmium concentrations ranging from 0 to 16 mg kg-1 were added to a 200 mL solution containing 148 kBq 109Cd. The available Cd in the soil was extracted by DTPA, Mehlich-1, Mehlich-3, and a mixture of organic acids (acetic,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Potentially toxic element; L-value; Radioactive tracer; Weathered tropical soils; Soil contamination.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162014000500010

Crop rotation biomass and arbuscular mycorrhizal fungi effects on sugarcane yield
Provedor de dados: 63
Autores: Ambrosano,Edmilson José; Azcón,Rozario; Cantarella,Heitor; Ambrosano,Gláucia Maria Bovi; Schammass,Eliana Aparecida; Muraoka,Takashi; Trivelin,Paulo César Ocheuze; Rossi,Fabrício; Guirado,Nivaldo; Ungaro,Maria Regina Gonçalves; Teramoto,Juliana Rolim Salomé.
A cana-de-açúcar (Saccharum spp.) vem sendo cultivada no Brasil para produção de açúcar e agroenergia. Em seu sistema de produção, após um ciclo de 4 a 8 anos, é possível a rotação com plantas de cobertura, antes do seu replantio, para melhoria do solo e geração de renda. Estudou-se a caracterização e produtividade de biomassa de leguminosas (como adubos-verdes) e girassol (Helianthus annuus L.), a ocorrência natural de micorrizas, o teor de açúcar e a produtividade em colmos da cana-de-açúcar IAC 87-3396 e a viabilidade econômica desse sistema com cultivo após as opções de rotação, com quantificação da produtividade durante três cortes consecutivos. O amendoim (Arachis hypogaea L.) cv. IAC-Caiapó, girassol cv. IAC-Uruguai e mucuna-preta (Mucuna aterrimum...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Green manure; Legumes; Biological nitrogen fixation; Sugarcane stalk yield.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000600011

Reference evapotranspiration estimation inside greenhouses
Provedor de dados: 63
Autores: Fernandes,Carolina; Corá,José Eduardo; Araújo,Jairo Augusto Campos de.
Because of the large area occupied by a class A pan, alternative methods have been sought to estimate reference evapotranspiration (Eto) inside greenhouses. The objective of this work was to compare ETo estimated by different methods inside and outside a greenhouse. A class A pan (CAPi), a reduced pan (RPi) and an atmometer (Ai) were installed inside a greenhouse, and another class A pan (CAPo) was installed outside. ETo estimates, obtained by CAPi, RPi, and Ai were 56%, 69% and 63% of those estimated by CAPo, respectively. A simple linear regression showed positive coefficients R = 0.94 for the RPi and the CAPi, R = 0.91 for the Ai and the CAPi, R = 0.70 for the CAPi and the CAPo, R = 0.66 for the RPi and the CAPo, and R = 0.62 for the Ai and the CAPo....
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Class A pan; Reduced pan; Atmometer.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000300027

Determination of a long-term optimal irrigation strategy for dry beans in Parana State, Brazil
Provedor de dados: 63
Autores: Faria,R.T. de; Folegatti,M.V.; Frizzone,J.A.; Saad,A.M.
The economical benefits of different irrigation strategies were assessed by long term simulation (20 years) for dry beans in Paraná, Brazil. The model BEANGRO was used to simulate crop yield and irrigation requirements assuming eight levels of irrigation threshold (20 to 90% of the remaining soil available water in steps of 10%), in addition to a level considering no irrigation. Net return was the objective function to select the optimum irrigation management strategy, assuming fixed and stochastic distributions of historical product price. The results showed that yield was significantly increased by irrigation despite a high variability for all the simulation strategies, due to variations on growth conditions over the years. Although the net return was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Irrigation; Modeling; Economical analysis.
Ano: 1997
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161997000300018

Nutrientes em compostos orgânicos de resíduos vegetais e dejeto de suínos
Provedor de dados: 63
Autores: Sediyama,Maria Aparecida Nogueira; Garcia,Neusa Catarina Pinheiro; Vidigal,Sanzio Mollica; Matos,AntonioTeixeira de.
Este trabalho objetivou avaliar a concentração de nutrientes de sete diferentes compostos orgânicos produzidos com bagaço de cana-de-açúcar, capim napier, palha de café e dejeto de suínos na forma líquida. Cada composto foi produzido com um ou mais resíduos vegetais associados ao dejeto de suínos, sendo o bagaço de cana-de-açúcar também associado ao gesso e ao superfosfato triplo. Foi utilizado o delineamento experimental de blocos casualizados, com três repetições e sete tratamentos. Aos 120 dias, as amostras foram coletadas e analisadas quimicamente, para quantificação, em espectrofotômetro de plasma, de macro e micronutrientes presentes nos compostos orgânicos. A presença do bagaço de cana-de-açúcar, como único resíduo vegetal, possibilitou a produção...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Compostagem; Dejeto; Suíno; Resíduo vegetal; Nutriente.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000100030

Impact of Amazon land use on the community of soil fungi
Provedor de dados: 63
Autores: Fracetto,Giselle G. M.; Azevedo,Lucas C.B.; Fracetto,Felipe J. C.; Andreote,Fernando D.; Lambais,Marcio R.; Pfenning,Ludwig H.
Considered as one of the most biodiverse biomes, the Amazon has a featured role in the discovery of new species of plants, animals and microorganisms, which may be important for the functionality of different ecosystems. However, studies on the impacts resulted from changes in the Amazon land use on microbial communities and their functions are still limited. In this context, the soil fungal diversity can act as an important indicator of environmental stress caused by land use of the Amazon. This study describes changes in soil fungal communities caused by different systems of land use (primary forest, secondary forest, agroforestry, agriculture and pasture). Communities were observed in each of the areas using denaturing gradient gel electrophoresis...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: DGGE; 18S rRNA; Fungal diversity; Soil biology.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162013000200001

ACCase-inhibiting herbicides: mechanism of action, resistance evolution and stewardship
Provedor de dados: 63
Autores: Takano,Hudson Kagueyama; Ovejero,Ramiro Fernando Lopez; Belchior,Gustavo Gross; Maymone,Gizella Potrich Leal; Dayan,Franck E.
ABSTRACT Herbicides play an important role in preventing crop yield losses due to both their weed interference ability and their capacity for increasing soil conservation in no-till systems. Group A herbicides or acetyl-CoA carboxylase (ACCase) are essential tools the selective management of glyphosate resistance in grass weed species. In this review, we describe important aspects of ACCase biology and herbicides targeting this enzyme, along with a discussion on stewardship programs to delay the evolution of herbicide resistance which can evolve either through target site and/or non-target site mechanisms. Sixteen-point mutations have been reported to confer resistance to ACCase inhibitors. Each mutation confers cross resistance to a different group of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Herbicide resistance; Integrated weed management; Aryloxyphenoxypropionates; Cyclohexanediones; Phenylpyrazoline.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000101301

Qualidade fisiológica e tamanho de sementes de cenoura
Provedor de dados: 63
Autores: Rodo,Angelica Brod; Perleberg,Cleiton Stigger; Torres,Salvador Barros; Gentil,Daniel Felipe de Oliveira; Tessarioli Neto,João.
A maturação de sementes de cenoura ocorre escalonadamente nas umbelas de diferentes ordens e, sendo a colheita realizada em uma única etapa, pode ocorrer desuniformidade de tamanho, dentro de um mesmo lote de sementes. Desta forma, este trabalho foi realizado visando determinar o efeito do tamanho da semente na sua qualidade fisiológica. Quatro lotes de sementes comerciais de cenoura cv. Brasília, provenientes da região de Bagé-RS, foram separados em três frações: grande (retenção em peneira de perfuração redonda 2 mm); média (retenção em peneira de perfuração redonda 1,5 mm) e a mistura entre grande e média (em porções iguais). Foram conduzidos os seguintes testes: germinação, tetrazólio, condutividade elétrica, envelhecimento acelerado e emergência de...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Daucus carota; Semente; Vigor; Germinação.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000100031

Thermal treatment of aluminous phosphates of the crandallite group and its effect on phosphorus solubility
Provedor de dados: 63
Autores: Francisco,Eros Artur Bohac; Prochnow,Luís Ignácio; Toledo,Maria Cristina Motta de; Ferrari,Viviane Carillo; Jesus,Sérgio Luís de.
Optimization in the use of phosphate rocks is important and the residues of fertilizer production in the form of crandallite may be suitable for agronomic use after calcination. With the objective of evaluating the effect of thermal treatment of the aluminous phosphates of the crandallite group as related to solubility, crystalline structure and morphology, samples from the mine residues of three Brazilian phosphate deposits (Tapira-MG, Catalão-GO, and Juquiá-SP) were collected, air-dried, and screened to 100 mesh. Sub samples were thermally treated at 300, 500, 700, and 900°C for 2 hours. Treated and untreated materials were analyzed by X-ray diffraction, scanning electronic microscopy, energy dispersive X-ray spectrometry, and for the total and soluble P...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Calcination; Phosphate fertilizer; Phosphate impurities.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000300009

Swingle citrumelo seed vigor and storability associated with fruit maturity classes based on RGB parameters
Provedor de dados: 63
Autores: Gomes-Junior,Francisco Guilhien; Arruda,Natália; Marcos-Filho,Julio.
ABSTRACT: Citrus seeds normally have low storability. Identifying an optimal fruit harvest time for production of high vigor seeds is important for nurseries; however, identifying this stage for Swingle citrumelo fruits has been based only on visual color examination, and research related to this parameter has been inconsistent. The main objective of this study was to evaluate a red-green-blue (RGB) color measurement system for successful identification of Swingle citrumelo fruits possessing seeds with maximum physiological potential and storability. Fruits were harvested at three ripening stages identified as green (G), greenish-yellow (GY), and yellow (Y) pericarp, photographed, and the images processed using ImageJ software. Data were expressed as the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Image analysis; Computer vision; Fruit maturation; Citrus rootstock; Seedling vigor.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162017000500357

Carbon sequestration and greenhouse gases emissions in soil under sewage sludge residual effects
Provedor de dados: 63
Autores: Pitombo,Leonardo Machado; Carmo,Janaina Braga do; Maria,Isabela Clerici de; Andrade,Cristiano Alberto de.
The large volume of sewage sludge (SS) generated with high carbon (C) and nutrient content suggests that its agricultural use may represent an important alternative to soil carbon sequestration and provides a potential substitute for synthetic fertilizers. However, emissions of CH4 and N2O could neutralize benefits with increases in soil C or saving fertilizer production because these gases have a Global Warming Potential (GWP) 25 and 298 times greater than CO2, respectively. Thus, this study aimed to determine C and N content as well as greenhouse gases (GHG) fluxes from soils historically amended with SS. Sewage sludge was applied between 2001 and 2007, and maize (Zea mays L.) was sowed in every year between 2001 and 2009. We evaluated three treatments:...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biosolid; Nitrogen; Carbon dioxide; Methane; Nitrous oxide.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162015000200147

Biology of Bemisia tabaci (Genn.) B-biotype and parasitism by Encarsia formosa (Gahan) on collard, soybean and tomato plants
Provedor de dados: 63
Autores: Takahashi,Karina Manami; Berti Filho,Evoneo; Lourenção,André Luiz.
The silverleaf whitefly Bemisia tabaci (Genn.) B-biotype (= B. argentifolii) (Hemiptera: Aleyrodidae) is a polyphagous insect attacking many plant species of economic importance. A comparison study was conducted on the duration of the egg-to-adult period, and the percentage of hatching eggs of Bemisia tabaci (Genn.) B-biotype on collard (Brassica oleracea L. var. acephala D.C.), soybean(Glycine max (L.) Merr.) and tomato (Lycopersicon esculentum Mill.) plants, as well as the egg-to-adult period of Encarsia formosa (Gahan) on the 1st, 2nd, 3rd and 4th whitefly nymphal instars on these three plant species. The experiments were conducted in a laboratory (25ºC, 70 ± 10% RH, 14-hour photophase). The duration of the egg-to-adult period of B. tabaci was 19.8 days...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hymenoptera; Aphelinidae; Hemiptera; Aleyrodidae; Silverleaf whitefly.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000600011

Does crotalaria (Crotalaria breviflora) or pumpkin (Cucurbita moschata) inter-row cultivation in restoration plantings control invasive grasses?
Provedor de dados: 63
Autores: César,Ricardo Gomes; Brancalion,Pedro Henrique Santin; Rodrigues,Ricardo Ribeiro; Oliveira,Aretha Medina dos Santos; Alves,Marcelo Corrêa.
Alternative methods to control invasive fodder grasses are necessary to reduce the use of herbicides in forest restoration, which has been carried out primarily in riparian zones. We sought to investigate if inter-row cultivation of crotalaria (Crotalaria breviflora DC) or pumpkin (Cucurbita moschata Duschene ex. Poir) with native tree species is an efficient strategy to control invasive fodder grasses in restoration plantings. We tested five treatments in a randomized block design, namely (1) control of brachiaria grass (Urochloa decumbens (Stapf.) Webster) with glyphosate in the implementation and post-planting grass control of the reforestation, (2 and 3) glyphosate use in the implementation and inter-row sowing of crotalaria (2) or pumpkin (3), and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Forest restoration; Green manuring; Inter-row cultivation; Native species reforestation; Grass control.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162013000400008

Milk quality parameters associated with the occurrence of veterinary drug residues in bulk tank milk
Provedor de dados: 63
Autores: Picinin,Lidia Cristina Almeida; Toaldo,Isabela Maia; Hoff,Rodrigo Barcellos; Souza,Fernando Nogueira; Leite,Mônica Oliveira; Fonseca,Leorges Moraes; Diniz,Soraia Araújo; Silva,Marcos Xavier; Haddad,João Paulo Amaral; Cerqueira,Mônica Maria Oliveira Pinho; Bordignon-Luiz,Marilde Terezinha.
ABSTRACT Veterinary drug residues in bulk tank milk are important to all sectors of the dairy chain because they are one of the major factors which determine the safety of the final product. This study attempted to identify milk quality parameters that are associated with the occurrence of veterinary drug residues using multivariate principal component analysis (PCA). A total of 132 raw milk samples were collected from 45 dairy farms in the state of Minas Gerais - Brazil and analyzed for 42 analytes, including pyrethroids, macrocyclic lactones and antibacterials, using liquid chromatography coupled with mass spectrometry in tandem mode and gas chromatography with electron capture detection. Out of the 132 milk samples, 40 samples tested positive for at...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pesticide; Anthelmintic; Antibacterial; Macrocyclic lactone; Food safety.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162017000300195

Efeitos de atrativos e repelentes sobre o comportamento da abelha (Apis mellifera, l.)
Provedor de dados: 63
Autores: MALERBO-SOUZA,D.T.; NOGUEIRA-COUTO,R.H.
O objetivo do presente ensaio foi testar diversas substâncias e verificar sua atratividade e repelência para abelhas, Apis mellifera, L. Para isso, foram realizados testes em discos próximos às colméias e em cana picada oferecida como alimentação para gado bovino confinado. Nos discos próximos à colméia, o produto mais atrativo foi Bee-Here e o mais repelente foi o óleo de citronela. No cocho para bovinos, o repelente mais efetivo foi n-octyl-acetato.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Atrativos; Repelentes.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000300006

Meteorological factors and Asian soybean rust epidemics: a systems approach and implications for risk assessment
Provedor de dados: 63
Autores: Del Ponte,Emerson Medeiros; Esker,Paul David.
Favorable meteorological and environmental conditions are critical components that affect Asian soybean rust (ASR), caused by Phakopsora pachyrhizi, the most damaging fungal disease of soybean. In this review, we used available knowledge on the effect of meteorological factors affecting the disease to construct a systems-based approach to understand the risk of ASR epidemics. The systems approach is based on a hierarchical framework where relevant environmental factors that affect the key stages of the ASR disease cycle are identified and this included both aerobiological and epidemiological components. The formal framework we used examined the following epidemic characteristics: spore release, spore dispersal, spore deposition, infection efficiency,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phakopsora pachyrhizi; Plant epidemiology; Risk prediction; Climatology; Plant diseases.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000700014

Agronomic responses of grapevine ‘Chenin Blanc’ as a function of training systems and rootstocks
Provedor de dados: 63
Autores: Leão,Patrícia Coelho de Souza; Chaves,Agnaldo Rodrigues de Melo.
ABSTRACT The aim of this research was to study the influence of training system and rootstock on the yield, vigor and physiology of the ‘Chenin Blanc’ grapevine at São Francisco Valley, northeastern Brazil. An experiment was carried out on eight harvests, from 2013 to 2017, in Petrolina, in the state of Pernambuco. Grapevines were grown under two training systems, lyre and espalier, and five rootstocks: ‘IAC 572’, ‘IAC 313’, ‘IAC 766’, ‘Paulsen 1103’ and ‘SO4’, using a split-plot randomized block design, with training systems assigned to the main plot and the rootstock assigned to the subplot. Lyre favored an increase in the number of bunches, branches and leaf mass in the harvest of the first semester of the year, while in the second semester there were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vitis vinifera; Tropical viticulture; Yield; Vigor.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000100601

Caracterização bioquímica de cultivares de cana-de-açúcar (Saccharum spp.): isoenzimas, proteína solúvel e valor brix
Provedor de dados: 63
Autores: Almeida,M. de; Crócomo,O. J.
No presente trabalho foram determinados o perfil isoenzimático diferencial de esterase e peroxidase, a proteína total solúvel e os sólidos solúveis (sacarose) em graus brix, de 10 cultivares de cana-de-açúcar (Saccharum spp.) atualmente cultivados no Brasil. Os cultivares estudados foram: NA 56-79, IAC 52-150, IAC 64-257, SP 70-1143, SP 71-3146, SP 71-3149, SP 71-1406, SP 71-6163, SP 71-61-68 e SP 71-799. Com os dados obtidos foi possível comprovar o valor taxonômico das características bioquímicas que representam uma inovação em taxonomia de cana-de-açúcar no Brasil. As isoenzimas de esterase apresentaram um padrão eletroforético específico para cada cultivar estudado, enquanto que as isoenzimas de peroxidase só permitiram agrupar os cultivares por...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Quimiotaxonomia; Cana-de-açúcar; Isoenzimas; Esterase; Peroxidase.
Ano: 1994
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000300007

Clonal Arabica coffee resistant to Meloidogyne paranaensis and damage threshold on plants development
Provedor de dados: 63
Autores: Fatobene,Bárbhara Joana dos Reis; Gonçalves,Wallace; Oliveira,Claudio Marcelo Gonçalves; Guerreiro Filho,Oliveiro.
ABSTRACT: Plants of Coffea arabica Icatu IAC 925 germplasm show resistance to Meloidogyne paranaensis under field conditions, but with variable rates of segregation. One mother plant, IAC 3, of Icatu IAC 925 was evaluated under controlled conditions through the reaction of its clones, obtained by somatic embryogenesis. Reproduction of nematodes in clones were compared with an open-pollinated progeny from the same mother plant, C. arabica cultivar Mundo Novo IAC 515-20, susceptible to nematodes, and Clone IAC 1, also susceptible and obtained by somatic embryogenesis. Open-pollinated progeny showed segregation to resistance and was classified as susceptible according to the reproduction factor. The average number of nematodes (eggs and J2) per gram of roots...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Root-knot nematodes; Resistant variety; Somatic embryogenesis.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162019001300227

Controle de Cerconota anonella em pomar de gravioleira
Provedor de dados: 63
Autores: Broglio-Micheletti,Sônia Maria Forti; Berti-Filho,Evôneo.
Testaram-se métodos químico e cultural para o controle de Cerconota anonella (Sepp., 1830) (Lepidoptera: Oecophoridae), principal praga da gravioleira (Annona muricata L.). O delineamento experimental utilizado foi o inteiramente casualizado, com 9 tratamentos e 20 repetições. Os melhores resultados foram obtidos com saco plástico microperfurado e papel kraft tratado com clorpirifós.
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Insecta; Broca-dos-frutos; Graviola.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000300029

Ammonia volatilisation from urease inhibitor-treated urea applied to sugarcane trash blankets
Provedor de dados: 63
Autores: Cantarella,Heitor; Trivelin,Paulo Cesar Ocheuze; Contin,Teodoro Leonardo Michelucci; Dias,Fábio Luis Ferreira; Rossetto,Raffaella; Marcelino,Rafael; Coimbra,Renato Badran; Quaggio,José Antonio.
Legal restrictions from burning sugarcane prior to harvest are causing a sharp increase in acreage which is harvested as green cane. The presence of a thick sugarcane trash mulch left after harvest makes it difficult to incorporate fertilisers in the soil. Since large losses of ammonia may occur when urea is surface applied to trash, it is important to find ways to improve urea-N use efficiency. The urease inhibitor NBPT slows down urea hydrolysis and thus may help decrease ammonia losses. Ammonia traps were set up in seven sugarcane fields covered with trash and fertilised with ammonium sulfate or ammonium nitrate, urea, and NBPT-treated urea. All N fertilisers were surface-applied at rates of 80 or 100 kg N ha-1. Very little N was lost when ammonium...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: NBPT; Nitrogen fertilizer; Ammonia losses.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000400011

Use of non-hyperaccumulator plant species for the phytoextraction of heavy metals using chelating agents
Provedor de dados: 63
Autores: Souza,Lucas Anjos; Piotto,Fernando Angelo; Nogueirol,Roberta Corrêa; Azevedo,Ricardo Antunes.
Soil contamination by heavy metals is a challenge faced by many countries, and engineering technologies to solve this problem are expensive and can cause negative impacts on the environment. One way to minimise the levels of heavy metals in the soil is to use plants that can absorb and accumulate heavy metals into harvestable parts, a process called phytoextraction. Typical plant species used in research involving phytoextraction are heavy metal hyperaccumulators, but plants from this group are not good biomass producers and grow more slowly than most species; thus, they have an important role in helping scientists understand the mechanisms involved in accumulating high amounts of heavy metals without developing symptoms or dying. However, because of their...
Tipo: Info:eu-repo/semantics/article
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162013000400010

How much sugarcane trash should be left on the soil?
Provedor de dados: 63
Autores: Cantarella,Heitor; Cerri,Carlos Eduardo Pellegrino; Carvalho,João Luís Nunes; Magalhães,Paulo Sérgio Graziano.
Tipo: Info:eu-repo/semantics/other
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162013000500001

Sugarcane root length density and distribution from root intersection counting on a trench-profile
Provedor de dados: 63
Autores: Azevedo,Mateus Carvalho Basilio de; Chopart,Jean Louis; Medina,Cristiane de Conti.
Root length density (RLD) is a critical feature in determining crops potential to uptake water and nutrients, but it is difficult to be measured. No standard method is currently available for assessing RLD in the soil. In this study, an in situ method used for other crops for studying root length density and distribution was tested for sugarcane (Saccharum spp.). This method involved root intersection counting (RIC) on a Rhodic Eutrudox profile using grids with 0.05 x 0.05 m and modeling RLD from RIC. The results were compared to a conventional soil core-sampled method (COR) (volume 0.00043 m³). At four dates of the cropping season in three tillage treatments (plowing soil, minimum tillage and direct planting), with eight soil depths divided in 0.1 m soil...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brasil; Root mapping; Root study methods; Trench-profile method.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000100014

Assessment of sugarcane trash for agronomic and energy purposes in Brazil
Provedor de dados: 63
Autores: Franco,Henrique Coutinho Junqueira; Pimenta,Maria Teresa Borges; Carvalho,João Luís Nunes; Magalhães,Paulo Sérgio Graziano; Rossell,Carlos Eduardo Vaz; Braunbeck,Oscar Antonio; Vitti,André Cesar; Kölln,Oriel Tiago; Rossi Neto,João.
Due to new possibilities for using sugarcane (Saccharum spp.) trash for electricity generation, and the production of 2nd generation ethanol and others chemicals, the interest for its recovery has increased. However, the question of how much trash can be removed from sugarcane field still needs to be clarified. This study evaluated the amount of dry matter, nutrients content, structural compounds and efficiency of the enzymatic hydrolysis of the hydrothermal pretreated materials for tops and dry leaves in samples from sugarcane varieties. Tops and dry leaves present differences in nutrients content and moisture. Therefore, the amount of trash to be collected should not be simply based on percentages, but also should take into account the different...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Saccharum spp.; Enzymatic hydrolysis; Sugarcane crop residues.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162013000500004

Feedlot performance, feeding behavior and rumen morphometrics of Nellore cattle submitted to different feeding frequencies
Provedor de dados: 63
Autores: Silva,Juliana da; Carrara,Tássia Veluma Barbosa; Pereira,Murillo Ceola Stefano; Oliveira,Cassiele Aparecida de; Batista Júnior,Ivan Carlos; Watanabe,Daniel Hideki Mariano; Rigueiro,André Luiz Nagatani; Arrigoni,Mário De Beni; Millen,Danilo Domingues.
ABSTRACT: Owing to the lack of information in the literature about the ideal feeding frequency adopted by feedlot systems, this study was designed to evaluate the effect of different feeding frequencies on performance, carcass traits, feeding behavior and rumen morphometrics of Nellore cattle. Forty-eight yearling bulls were housed in individual pens with an average initial body weight of 358.2 kg. The experiment was designed as a completely randomized block and the treatments were the feeding of cattle one, two, three, or four times daily (n = 12 per treatment). Orthogonal contrasts were used to assess linear, quadratic and cubic relationship between feeding frequency and the dependent variable. As feeding frequency increased, final body weight (p = 0.03)...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zebu; Carcass; Concentrate; Intake; Papillae.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162018000200121

Bioavaliação de estado nutricional do arroz (Oryza sativa L. var. IAC-165) e do feijoeiro (Phaseolus vulgaris L. Var. carioca) utilizando 15N e 32P
Provedor de dados: 63
Autores: Calvache,A.M.; Bernardi,A.C.C.; Oliveira,F.C.; Prada Neto,E.; Silva,J.A.A.; Malavolta,E.
Arroz e feijão foram cultivados em soluções nutritivas em presença de três níveis de N, P e K. O método da bioavaliação do estado nutricional em que raízes destacadas absorvem elementos marcados, no caso presente 15N e 32P, foi comparado com o de diagnose foliar. Foram tiradas duas conclusões principais: 1) os bioensaios mostraram ser um procedimento rápido e útil para o diagnóstico do estado nutricional das duas espécies, visto haver correlação significativa negativa entre absorção e produção de matéria seca; 2) a absorção de dois isótopos pelas raízes da planta previamente submetida a níveis diferentes de N e de P na solução foi inversamente proporcional aos teores foliares desses elementos.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Estado nutricional; Bioavaliação; Arroz; Feijão; 15N; 32P.
Ano: 1994
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000300002

Apparent digestibility of diets with combinations of soybean hulls and coastcross (Cynodon sp.) hay offered to ram lambs
Provedor de dados: 63
Autores: Araujo,Rafael Canonenco de; Pires,Alexandre Vaz; Susin,Ivanete; Urano,Fumi Shibata; Mendes,Clayton Quirino; Rodrigues,Gustavo Henrique; Packer,Irineu Umberto.
Soybean hulls (SH) are an alternative fiber source that may be used to maintain neutral detergent fiber (NDF) concentration while increasing the energy concentration of ruminant diets. The objective of this experiment was to determine the effects of replacing coastcross (Cynodon sp.) hay NDF by SH NDF on the apparent digestibility of nutrients and nitrogen balance of Santa Inês ram lambs. Twenty-four animals (42.5 ± 3.6 kg of body weight and six months old) were placed in metabolism crates and assigned in a randomized complete block design defined by body weight (BW). Experimental diets provided a similar concentration of NDF (52%) and crude protein (15%). Hay NDF from a 70% roughage-based diet was replaced with SH NDF by 33%, 67%, and 100%, resulting in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: NDF; Hair sheep; Nitrogen balance; Santa Inês; Water intake.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000600003

Contribution of nitrogen from sugarcane harvest residues and urea for crop nutrition
Provedor de dados: 63
Autores: Fortes,Caio; Vitti,André Cesar; Otto,Rafael; Ferreira,Danilo Alves; Franco,Henrique Coutinho Junqueira; Trivelin,Paulo Cesar Ocheuze.
Sugarcane (Saccharum spp.) harvested without burning provides a substantial amount of remains (trash) on soil profiles which can be decomposed and release nutrients contributing to reduce fertilizer needs. The contribution of nitrogen (N) from sugarcane plant residues and fertilizer in sugarcane nutrition was assessed. Plant cane treatments were micro plots of 15N-labeled urea, sugarcane trash and root system; the last two to simulate the previous crop residues incorporated into the soil after crop renewal. For ratoons, N-ammonium nitrate (N-AN) micro plots, 150 kg ha-1 of N-AN and control (0 kg ha-1) were set up to evaluate the contribution of trash in N supply and quantify the effects of N-fertilizer on N-trash mineralization. The N balances derived from...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Saccharum spp.; 15N isotope; N balance; Urea; Straw; Roots and rhizomes.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162013000500005

Tipos e doses de calcário nas características agronômicas de Panicum maximum Jacq. cv. Tobiatã em função dos métodos de aplicação
Provedor de dados: 63
Autores: Luz,Pedro Henrique de Cerqueira; Herling,Valdo Rodrigues; Braga,Gustavo José; Vitti,Godofredo César; Lima,César Gonçalves de.
As características agronômicas da pastagem dependem da qualidade do solo. Neste trabalho foram avaliados os efeitos de tipos e doses de calcário, com e sem incorporação, em algumas características agronômicas de uma pastagem degradada de Panicum maximum Jacq. cv. Tobiatã, num Latossolo Vermelho distrófico. As avaliações ocorreram durante quatro cortes consecutivos no período das chuvas ("verão") de 1995/96 e um corte no período seco ("inverno") em 1996. A produção de matéria seca do capim-Tobiatã aumentou com o método de incorporação com grade, devido ao efeito mecânico, porém não respondeu aos tipos e doses de calcário, sendo observadas as maiores produções no 4º corte ("verão"). Foram observados aumentos na cobertura de solo pela planta forrageira para...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Composição botânica; Pastagem degradada; Perfilhamento; Meristema apical.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000100022

Four-way data analysis within the linear mixed modelling framework
Provedor de dados: 63
Autores: Studnicki,Marcin; Mądry,Wiesław; Derejko,Adriana; Noras,Kinga; Wójcik-Gront,Elżbieta.
Cultivars have to be evaluated under different crop management systems across agro-ecosystems and years using multi-environment trials (MET) before releasing them to the market. Frequently, data collected in METs are arranged according to cultivar (G), management (M), location, (L) and year (Y) combinations in a four-way G x M x L x Y data table that is highly unbalanced for cultivars across locations and time. Therefore, we present the restricted maximum likelihood method (REML) for linear mixed models (LMM) with a factor analytic variance-covariance matrix for assessing cultivar adaptation to crop management systems and environments based on unbalanced datasets. Such a multi-environmental trial system has been in operation in Poland for winter wheat...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Crop management; Restricted maximum likelihood methods; Unbalanced data; Winter wheat.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162015000500411

Phosphorus critical levels and availability in lowland soils cultivated with flooded rice
Provedor de dados: 63
Autores: Mariano,Isabela Orlando dos Santos; Fernandes,Luiz Arnaldo; Faquin,Valdemar; Andrade,Alex Teixeira de.
Lowland soils present a great potential for the flooded rice crop. This work aimed to estimate critical levels of P in waterlogged soils cultivated with rice using Mehlich 1 and anion exchange resin as soil-P extractors, compare the performance of these extractors as for the evaluation of the P availability, and study the soil-P fractions involved in the P nutrition of the rice crop. Studied soils consisted of four Histosols: Low Humic Gley (GP), Aluvial (A), Humic Gley (GH) and Bog Soil (O) which were previously cultivated with beans. The experimental design was completely randomized, in a factorial scheme, using four soils, five P rates (75, 150, 300, 500 and 800 mg dm-3) and two liming treatments (with and without liming), with three replicates. After...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Oryza sativa; Phosphorus fractions; Extractors.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000100017

Exchangeable aluminum evaluation in acid soils
Provedor de dados: 63
Autores: Abreu Jr.,Cassio Hamilton; Muraoka,Takashi; Lavorante,André Fernando.
One of the main factors limiting agricultural production in tropical climate regions is mainly related to the presence of exchangeable aluminum (Al3+) in highly weathered acid soils. Four methods of Al3+ determination extracted with neutral 1 mol L¹ KCl solution were evaluated: three colorimetric methods (aluminon plus ascorbic acid, and eriochrome cyanine R by FIA) and the usual titrimetric method with back-titration. Surface samples from 20 soils of different Brazilian regions, with active acidity (0.01 mol L¹ CaCl2 pH) ranging from very high to medium (3.82 to 5.52), were used. The variance analysis revealed significant interaction among Al3+ determination methods and soil. Mean methods comparisons within each soil (Tukey, P &lt; 0.05) indicated that,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: FIA; Aluminon; Colorimetry; Eriochrome cyanine R; Titrimetry.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000300020

Efeitos do boro e zinco no teor de carboidratos solúveis, aminoácidos totais e no enraizamento de estacas de ramos de ameixeira (Prunus salicina Lindl)
Provedor de dados: 63
Autores: Kersten,E.; Lucchesi,A.A.; Gutierrez,L.E.
O presente trabalho foi realizado com o objetivo de avaliar o efeito do boro (B) e do zinco (Zn) no teor de carboidratos solúveis, aminoácidos totais e no enraizamento de estacas de ramos dos cultivares Carmesim e Grancuore de ameixeira (Prunas salicina Lindl.). Para a aplicação dos tratamentos houve uma fase preliminar que constou da seleção e identificação de quatro filas com vinte plantas cada uma e alternadas com filas de bordadora, que receberam os tratamentos com bórax (B), sulfato de zinco (Zn), bórax mais sulfato de zinco (B + Zn) e controle. O experimento para enraizamento de estacas de ramos foi realizado em viveiros com nebulização intermitente, no município de Brotas,SP. A coleta de material para avaliação do efeito dos tratamentos com boro,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Enraizamento; Ameixeira; Prunus salicina Lindl.; Boro; Zinco; Carboidratos solúveis; Aminoácidos totais.
Ano: 1993
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161993000100003

Heterosis and genetic parameters for grain quality in oat segregating populations
Provedor de dados: 63
Autores: Silveira,Solange Ferreira da Silveira; Hawerroth,Maraisa Crestani; Oliveira,Danyela de Cássia da Silva; Woyann,Leomar Guilherme; Almeida,Helaine Claire Ferreira de; Luz,Viviane Kopp da; Thurow,Liamara; Silva,Raíssa Martins da; Gutkoski,Luiz Carlos; Maia,Luciano Carlos da; Oliveira,Antonio Costa de.
ABSTRACT Improvement of quality-related traits of grains is a constant concern in white oat breeding programs, which challenges breeders to understand their dynamics. The performance of different genetic combinations must be thoroughly evaluated to make high nutritional quality cultivars available. This study aimed to estimate the heterosis on F1 and F2 generations, vigor loss, due to inbreeding, and correlation between the grain chemical components to understand the dynamics of these traits, considering two segregating oat progenies. The populations Albasul × UPF 15 (population 1) and IAC 7 × UFRGS 19 (population 2) were developed. Both populations showed transgressive segregant individuals. The combination Albasul × UPF 15 provided significant heterosis...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Avena sativa; Functional food; Artificial hybridization; Correlation.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000500471

Acetylcholinesterase enzyme activity in carp brain and muscle after acute exposure to diafuran
Provedor de dados: 63
Autores: Golombieski,Jaqueline Ineu; Marchesan,Enio; Camargo,Edinalvo Rabaioli; Salbego,Joseânia; Baumart,Joele Schmitt; Loro,Vania Lucia; Machado,Sérgio Luiz de Oliveira; Zanella,Renato; Baldisserotto,Bernardo.
Sublethal adverse effects may result from exposure of aquatic organisms to insecticides at environmentally relevant concentrations. Fingerlings of the common carp (Cyprinus carpio, Linnaeus, 1758), grass carp (Ctenopharyngodon idella, Valenciennes, 1844), and bighead carp (Aristichthys nobilis, Richardson, 1845) were exposed to diafuran, an insecticide widely used during rice cultivation in Southern Brazil. The aim of this study was to verify the relationship between the lethal concentration (LC50) of diafuran and the acetylcholinesterase (AChE) activity in brain and muscle tissues of these species as a possible early biomarker of exposure to this insecticide. LC50 was determined for fish exposed to diafuran concentrations during 96 h (short term): common...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cyprinus carpio; Ctenopharyngodon idella; Aristichthys nobilis; Pesticide; Lethal concentration.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000400003

Método prático para o cultivo de espécies silvestres do gênero Oryza
Provedor de dados: 63
Autores: Silva,Edson Ferreira da; Ando,Akihiko; Montalván,Ricardo; Tulmann Neto,Augusto.
É descrito um método simples e prático para o cultivo de plantas das espécies silvestres do gênero Oryza, em vasos com solo orgânico, submersos em "piscinas" com água. Este método proporciona às plantas uma condição similar ao habitat natural da maioria das espécies, favorecendo assim o desenvolvimento e a prolificidade dos genótipos.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Oryza; Arroz silvestre.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000400032

Transmissibilidade do virus do mosaico comum da soja (VMCS) por intermédio das sementes de soja(Glycine max (L.) Merrill)
Provedor de dados: 63
Autores: Barros,A.S.do R.; Silva,W.R. da.
Diante da dispersão do vírus VMCS nas lavouras brasileiras de soja, o presente trabalho foi conduzido procurando verificar a transmissibilidade do patógeno pelas sementes portadoras do sintoma ("mancha café") característico da doença. Para tanto, material proveniente de campos contaminados foi testado quanto às porcentagens de emergência e infecção das plântulas. Os resultados obtidos permitiram concluir que o patógeno é transmitido por sementes, ainda que estas estejam livres de sintomas; contudo, apesar da inexistência de efeitos sobre a emergência, a elevação da freqüência de sementes com "mancha café" tende a ampliar o número de plântulas contaminadas.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Semente; Mancha café; Vírus do mosaico comum da soja.
Ano: 1992
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161992000400020

Estimation of jundiá (Rhamdia quelen) dietary amino acid requirements based on muscle amino acid composition
Provedor de dados: 63
Autores: Meyer,Gustavo; Fracalossi,Débora Machado.
Jundiá, Rhamdia quelen (Quoy &amp;amp; Gaimard, 1824), is a catfish native to Central and South America. The species has a number of excellent farming features, such as easy handling, low temperature resistance, efficient feed conversion, flavorsome meat and absence of intramuscular bones, and has been increasingly raised in Southern Brazil. However, most of its nutritional requirements have not yet been determined, including the essential amino acid (EAA) requirements. The objective of the present study was to estimate such requirements through the determination of muscle tissue amino acid composition for four groups of jundiá. Two groups were wild caught and allocated in two categories: from 1 to 100 g and from 101 to 200 g. The other two groups,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nutrition; Catfish; Siluriformes; Growth; Weigth gain.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000400015

Impurezas fibrosas da cana-de-açúcar e parâmetros tecnológicos do caldo extraído
Provedor de dados: 63
Autores: Bovi,Roberto; Serra,Gil Eduardo.
O presente trabalho teve por objetivo verificar o efeito da presença de folhas verdes e folhas secas nos parâmetros tecnológicos do caldo da cana-de-açúcar, tendo como controle a adição de fibra do colmo. Os ensaios foram delineados tendo por base a adição de quantidades das fontes fibrosas - folha verde, folha seca e fibra do colmo - para formular amostras que correspondessem a acréscimos absolutos de 0,25 ; 0,50 e 0,75 pontos porcentuais sobre o teor de fibra da cana do tratamento controle. Os resultados mostraram que a presença de folhas verdes causaram redução no Brix, pol e pureza do caldo, e elevação do teor de açúcares redutores e cinzas do caldo. Estes resultados, estatísticamente significativos a nível de 1% de probabilidade, foram expressos por...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cana-de-açúcar; Impureza; Folha; Caldo.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000400016

Univariate and multivariate analysis on processing tomato quality under different mulches
Provedor de dados: 63
Autores: Moreno,Carmen; Mancebo,Ignacio; Tarquis,Ana María; Moreno,Marta María.
The use of eco-friendly mulch materials as alternatives to the standard polyethylene (PE) has become increasingly prevalent worldwide. Consequently, a comparison of mulch materials from different origins is necessary to evaluate their feasibility. Several researchers have compared the effects of mulch materials on each crop variable through univariate analysis (ANOVA). However, it is important to focus on the effect of these materials on fruit quality, because this factor decisively influences the acceptance of the final product by consumers and the industrial sector. This study aimed to analyze the information supplied by a randomized complete block experiment combined over two seasons, a principal component analysis (PCA) and a cluster analysis (CA) when...
Tipo: Info:eu-repo/semantics/article
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162014000200004

Adaptation patterns of winter wheat cultivars in agro-ecological regions
Provedor de dados: 63
Autores: Studnicki,Marcin; Derejko,Adriana; Wójcik-Gront,Elżbieta; Kosma,Michał.
ABSTRACT: Multi-environment trials are commonly used to assess cultivar adaptation patterns under different environmental conditions and to help make effective cultivar recommendations for growers. An example of a multi-environment trial system used for cultivar recommendations is the Polish Post-registration Variety Testing System. A common approach in cultivar recommendations is to evaluate the adaptability of cultivars across, or for, specific trial locations. However, the locations of the trials and the fields where a farmer will grow a crop are hardly ever in the same place. Therefore, it would be better to group the trial locations into regions and give recommendations for the whole region. The aim of this study is to evaluate the grain yield...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Crop management intensity; Covariance structure; Cultivar recommendation; Superior genotypes; Yield ranking.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162019001200148

Effect of pH and temperature on peroxidase and polyphenoloxidase activities of litchi pericarp
Provedor de dados: 63
Autores: Mizobutsi,Gisele Polete; Finger,Fernando Luiz; Ribeiro,Rosilene Antônio; Puschmann,Rolf; Neves,Ludmila Lafetá de Melo; Mota,Wagner Ferreira da.
After harvesting litchi, the red color of the fruit pericarp is rapidly lost resulting in discoloration and browning during storage and marketing. The loss of the red color is caused by the degradation or loss of stability of anthocyanins. The action of peroxidase and polyphenoloxidase is usually related to the browning and discoloration of fruits of various species. This study aimed to evaluate the influence of pH and temperature on peroxidase and polyphenoloxidase activities, in a partially purified preparation of pericarp of the litchi cultivar Bengal. Fruits were harvested at the ripe stage and polyphenoloxidase was partially purified by sequential saturation in 80% ammonium sulfate. At concentrations of 40-50% and 60-70% ammonium sulfate the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Litchi Chinensis Sonn.; Enzyme purification; Skin browning.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000200013

Disponibilidade de potássio e suas relações com cálcio e magnésio em soja cultivada em casa-de-vegetação
Provedor de dados: 63
Autores: Oliveira,Fábio Alvares de; Carmello,Quirino Augusto de Camargo; Mascarenhas,Hipólito Assunção Antonio.
A falta de resposta da soja à aplicação de K em elevadas quantidades pode estar relacionada com suas interações com o Ca e o Mg do solo e, portanto, com a calagem. O objetivo deste trabalho foi avaliar a nutrição potássica da soja em relação ao cálcio e ao magnésio do solo, por um experimento em vasos protegidos, sob casa-de-vegetação, utilizando-se um Latossolo Vermelho Amarelo distrófico típico, textura média, disposto num esquema fatorial 5x7 em blocos casualizados, com 4 repetições. Aplicaram-se, 40 dias antes da semeadura, cinco níveis de calcário dolomítico calcinado (0, 500, 1000, 1500, 2000 mg dm-3), combinados com sete níveis de K (0, 15, 30, 45, 60, 75, 90 mg dm-3), aplicados na forma de KCl, previamente à semeadura. Em cada vaso, cultivaram-se 4...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycine max; Potássio; Material seco; Relação (Ca+Mg)/K.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000200016

Alterações na atividade e no perfil eletroforético da peroxidase em folhas de milho (Zea mays) e sorgo (Sorghum bicolor) tratadas com levedura (Saccharomyces cerevisiae)
Provedor de dados: 63
Autores: RONCATTO,M.C.; PASCHOLATI,S.F.
O trabalho foi desenvolvido com o objetivo de se verificar a influência de Saccharomyces cerevisiae na forma de produto comercial, fermento biológico fresco para panificação, na atividade e no padrão eletroforético da peroxidase em folhas de milho e sorgo. As preparações de Saccharomyces utilizadas foram representadas por suspensões de células e seus respectivos filtrados, autoclavados ou não. A análise dos extratos obtidos dessas gramíneas mostrou que suspensões de células e os filtrados dessas suspensões, tratadas termicamente ou não, foram efetivos em ocasionar alterações na atividade e padrão eletroforético da peroxidase em milho e sorgo. Além de se mostrarem termoestáveis, os extratos obtidos de células intactas ou homogeneizadas de S. cerevisiae...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Saccharomyces cerevisiae; Peroxidase; Eletroforese; Milho; Sorgo.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000300007

Enzyme complex supplementation in different nutrient levels diets on pigs feces excretion and anaerobic digestion
Provedor de dados: 63
Autores: Ruiz,Urbano dos Santos; Thomaz,Maria Cristina; Lucas Júnior,Jorge de; Pascoal,Leonardo Augusto Fonseca; Watanabe,Pedro Henrique; Amorim,Alessandro Borges; Xavier,Cristiane de Almeida Neves; Silva,Adriane Andrade.
ABSTRACT This research aimed to evaluate enzyme supplementation in diets with different nutritional levels for pigs in their feces excretion and anaerobic digestion. Fifty four gilts were placed on diets formulated to achieve 100 or 95 or 90 % of a pig's nutrient requirements, with the addition of an enzyme complex containing amylase, β-glucanase, cellulase, pectinase, xylanase, protease and phytase (diets 100E, 95E and 90E) or without the enzymes (diets 100, 95 and 90). The trial was divided into three periods (1, 1-2 and 1-3) based on the animal weight. The enzyme complex reduced (p &lt; 0.05) excretions per period and per unit of weight gain (residue coefficients) of organic matter (OM) in Period 1, of N, Ca, Zn and Na in Period 1-2, and of Na...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biogas; Environmental impact; Fecal production; Swine.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162017000300180

Use of molecular marker techniques in seed testing by Brazilian seed companies
Provedor de dados: 63
Autores: Della Vecchia,P.T.; Silva,C.A.R. da; Terenciano-Sobrinho,P.
Seed market is becoming global and globalization is growing very fast. To compete favourably in this new global seed world, quality and cost are and will be certanly the key issues. High seed quality can only be obtained by a thorough control of the entire seed production process, step by step from planning to final delivery. That requires science, technology, expertise, experience, good management and certanly, the most important, an absolute and unconditional commitment with quality. Seed testing for quality assurance is one important step in the process of production of high quality seed. In the late years a considerable amount of research has been published, particularly on the use of some Polymerase Chain Reaction DNA based new technologies (RAPD,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Molecular markers; Seed testing; Seed companies; Genetic purity.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000500014

Pre-breeding: a link between genetic resources and maize breeding
Provedor de dados: 63
Autores: Nass,Luciano Lourenço; Paterniani,Ernesto.
Activities related to genetic resources are characterized by high cost and long term return. Thus the conservation of genetic variability for the future and the efficient utilization of available accessions are two important goals to be attained. However, the low utilization of germplasm banks is not restricted to Brazil but to other developing countries as well. Therefore, pre-breeding is a promising alternative to link genetic resources and breeding programs. Several aspects for maize are discussed such as concept, importance, methods and results. Problems to be investigated and suggestions are also presented.
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Zea mays; Pre-breeding; Genetic resources.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000300035

ESTAQUIA SEMI-LENHOSA: UM MÉTODO RÁPIDO E ALTERNATIVO PARA A PRODUÇÃO DE MUDAS DE LIMA ÁCIDA 'TAHITI'
Provedor de dados: 63
Autores: Prati,Patricia; Mourão Filho,Francisco de Assis Alves; Dias,Carlos Tadeu dos Santos; Scarpare Filho,João Alexio.
Avaliou-se o efeito de várias concentrações e tempos de exposição de dois reguladores de crescimento no enraizamento de estacas de lima ácida `Tahiti' (Citrus latifolia Tanaka). Experimentos complementares também avaliaram a eficiência do enraizamento de estacas de laranjas `Pêra' e `Valencia' (Citrus sinensis L. Osbeck) comparando-a com a da lima ácida `Tahiti'. Os trabalhos experimentais foram conduzidos, em Piracicaba, SP, em câmara de nebulização intermitente, com estacas ponteiro, semi-lenhosas, coletadas 5 meses após a brotação, com 10 cm de comprimento, sem as 3 folhas basais. O delineamento experimental adotado foi o de blocos casualizados com 4 repetições para todos os ensaios realizados. A avaliação dos tratamentos foi realizada 90 dias após a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Citrus latifolia; Citrus sinensis; Propagação.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000100025

Organogenesis from internodal segments of yellow passion fruit
Provedor de dados: 63
Autores: Biasi,Luiz Antonio; Falco,Maria Cristina; Rodriguez,Adriana P. M.; Mendes,Beatriz M. Januzzi.
Organogenesis induction from internodal segments of yellow passionfruit (Passiflora edulis f. flavicarpa) was obtained in a medium supplemented with 1.0-4.0 mg L-1 benzylaminopurine (BAP). Callus proliferation and adventitious shoot development were analyzed by light and scanning electron microscopy. Callus proliferation and adventitious shoots were observed simultaneously and continuously, with asynchronous development of shoots in the explants. Proliferation of callus was observed in the explant cut ends in all treatments, including the control. The results show that concentrations of 1.0 or 2.0 mg L-1 BAP gave better rate of organogenesis. Higher concentrations were efficient for the induction of adventitious buds and, were, however, detrimental for...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Passiflora edulis f. flavicarpa; Adventitious shoots; Light microscopy; Scanning electron microscopy; Benzylaminopurine.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000400010

Causes of morphological discontinuities in soils of Depressão Central, Rio Grande do Sul State, Brazil
Provedor de dados: 63
Autores: Michelon,Cristiane Regina; Azevedo,Antonio Carlos de; Pedron,Fabrício de Araújo; Dalmolin,Ricardo Simão Diniz; Stürmmer,Sidinei Klochnner; Gonçalves,Juliana; Jesus,Sérgio Luis de.
Morphological, particularly textural, discontinuities between horizons increase soil erodibility in Depressão Central, Rio Grande do Sul State (Brazil). Characterization of such discontinuities would help to understand landscape evolution and to model near-surface hydrology. The objective of this research was to explore the relationship between morphological discontinuity and deposition of transported materials during pedogenesis. Transported material was meant to be mineral particles found in the soil profile, transported probably by water or gravity, that were not present neither in the parent material nor derived from it. Five soils of this region (two Alfisols, two Ultisols and one Mollisol) were sampled and morphological, sand grain size statistics,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil morphology; Subtropical soils; Soil discontinuity.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000300010

Manejo do solo e o rendimento de soja, milho, feijão e arroz em plantio direto
Provedor de dados: 63
Autores: Kluthcouski,João; Fancelli,Antônio Luiz; Dourado-Neto,Durval; Ribeiro,Cristina Maria; Ferraro,Luiz Antônio.
O sistema de plantio direto tem sido adotado expressivamente por agricultores do cerrado brasileiro. Contudo, seu uso continuado em regiões tropicais, com insuficiência de cobertura do solo e sucessivas adubações superficiais, pode resultar em alterações nos parâmetros do solo, como compactação e acúmulo de nutrientes na superfície, e na baixa expressão do potencial produtivo das culturas. O presente estudo teve como objetivo principal verificar o efeito de quatro sistemas de manejo de solo (plantio direto; grade aradora; escarificação profunda e aração profunda) associados com três níveis de adubação fosfatada e potássica (sem adubação, recomendação oficial e equivalente a exportação pelas colheitas) sobre o rendimento das culturas do milho, soja, feijão...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Plantio direto; Rendimento; Soja; Milho; Arroz; Feijão.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000100016

Effect of mini-sprinkler irrigation system on Heterorhabditis baujardi LPP7 (Nematoda: Heterorhabditidae) infective juvenile
Provedor de dados: 63
Autores: Lara,Juan Carlos; Dolinski,Cláudia; Sousa,Elias Fernandes de; Daher,Rogério Figueiredo.
Entomopathogenic nematodes (EPNs) are currently being used as successful biological control agents of soil-dwelling insect pests. Previous field and greenhouse studies demonstrated that application techniques and non-biotic factors (temperature and pressure) have a significant effect on EPNs efficacy. The objective of this study was to evaluate the influence of an irrigation spray application system on the viability, infectivity and host search capability of Heterorhabditis baujardi LPP7 (Nematoda: Heterorhabditidae) infective juveniles (IJ). Two assays were proposed. Their viability was evaluated under the microscope after the IJ passed through the irrigation system. Infectivity on Galleria mellonella larvae, and host search capability, as evidenced by...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biological pest control; Application technology; Viability; Infectivity; Search capability.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000400017

Fish and fishery products trade in Brazil, 2005 to 2015: A review of available data and trends
Provedor de dados: 63
Autores: Barone,Rafael Simões Coelho; Lorenz,Evandro Kleber; Sonoda,Daniel Yokoyama; Cyrino,José Eurico Possebon.
ABSTRACT: Along the last ten years fish and fishery product trade in Brazil has been on a downward trajectory turning a profit of US$ 98.6 million in 2005 into a loss of US$ 1.25 billion by 2014. On the other hand, the country is a leading producer of grains and has the third largest animal feed industry in the world, which has added 5.5 million hectares of freshwater reservoirs and 3.5 million km2 of an exclusive marine economic zone in the same period, a sizable potential for development of the aquaculture industry. This study aims at unveiling strategies for the reduction of the deficit in the Brazilian seafood trade balance, based on critical analysis of the quantitative and qualitative characteristics of imported fishery products. The fish and fishery...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Seafood; Demand analysis; Price analysis; Market preferences; Aquaculture economics.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162017000500417

Accelerated aging of melon seeds
Provedor de dados: 63
Autores: Torres,Salvador Barros; Marcos Filho,Julio.
Accelerated aging is one of the most useful tests used for the evaluation of seed vigor but it is seldomly used to test melon (Cucumis melo L.) seeds. The objective this research was to compare different procedures of the accelerated aging test to evaluate the physiological quality of melon seeds and the efficiency of using saturated salt solution for the control of water uptake by seeds. Five seed lots each of the hybrids AF-646 and AF-682 were tested for germination, seedling emergence, traditional accelerated aging (periods 0f 48, 72 and 96 hours, at 38 or 41°C) and salt saturated accelerated aging. The accelerated aging test (traditional procedure and with salt solution) for 72h and 96h, at 38 or 41°C was sensitive to detect differences in the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cucumis melo; Physiological quality; Vigor.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000100012

Nucleation in tropical ecological restoration
Provedor de dados: 63
Autores: Reis,Ademir; Bechara,Fernando Campanhã; Tres,Deisy Regina.
Ecological theories of facilitation and nucleation are proposed as a basis for environmental restoration in tropical ecosystems. The main goal of this paper is to present restoration techniques based on the concept of nucleation, in which small nuclei of vegetation are established within a degraded land. The nucleation techniques (artificial shelters for animals, planting of herbaceous shrub life forms, soil and seed bank translocation, seed rain translocation, soil and seed rain translocation's seedling set, artificial perches, planting of native trees in groups, and ecological stepping-stones with functional groups) promote the landscape connectivity on two flows: inward: receiver connectivity and outward: donor connectivity. The nuclei development...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Facilitation; Succession; Heterogeneity; Landscape connectivity; Degraded areas.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000200018

Protein hydrophobic dressing on seeds aiming at the delay of undesirable germination
Provedor de dados: 63
Autores: Assis,Odilio Benedito Garrido; Leoni,Ariane Maria.
Polymer seed-coatings have been largely tested as an alternative method for preventing diseases and have the potential to be used to control undesirable germination and thereby increasing seed storage. Amongst these, the protein-based coatings can be applied with advantage of forming stable biodegradable and hydrophobic films. Due to their chemical structure, protein dressings act as efficient barriers for water uptake, even when seeds are unavoidable exposed to a moist environment. In this work, the effect of hydrophobic dressings was tested on the germination rate of sugar beet (Beta vulgaris L.) and broccolis (Brassica oleraceae var italic L.) seeds under laboratorial condition. Zein, natural maize (Zea mays L.) proteins extracted from gluten meal, was...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Seed dressing; Undesirable germination control; Protein coating; Seed storage.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000100017

Soil Physical quality under groundcover management systems in citrus
Provedor de dados: 63
Autores: Fidalski,Jonez.
Tipo: Info:eu-repo/semantics/other
Ano: 2023
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010010300001

FUSÃO DE PROTOPLASTOS DE Saccharomyces cerevisiae AVALIADA POR FLOCULAÇÃO E PRODUÇÃO DE H2S
Provedor de dados: 63
Autores: MARTINS,C.V.B.; HORII,J.; PIZZIRANI-KLEINER,A.A.
Com o objetivo de obter linhagens de leveduras com características de importância para a indústria vinícola, empregou-se a técnica da fusão de protoplastos. A atenção foi dirigida a duas características: floculação e não produção de H2S. Uma vez que cada característica é de baixa frequência (1% cada) em leveduras vinícolas, torna-se pouco provável a ocorrência natural de uma linhagem com ambas as características. O cruzamento foi realizado via fusão de protoplastos pois as linhagens apresentaram incompatibilidade sexual. Inicialmente foram obtidos os mutantes auxotróficos contrastantes e posteriormente suas marcas foram avaliadas quanto à reversão e, em seguida foram determinadas suas curvas de crescimento. Obteve-se a protoplastização por tratamento com...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fusão de protoplastos; Sulfeto de hidrogênio; Floculação; Leveduras; Saccharomyces cerevisiae; Linhagens.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000100012

Replacement of native vegetation alters the soil microbial structure in the Pampa biome
Provedor de dados: 63
Autores: Suleiman,Afnan Khalil Ahmad; Pylro,Victor Satler; Roesch,Luiz Fernando Wurdig.
ABSTRACT: Land use change is one of the the major factors related to soil degradation and alterations in soil microbial diversity and structure. In this study, we aimed to evaluate the microbial shifts caused by deforestation of a small area of a natural forest for the introduction of a pasture in the Brazilian Pampa. The microbial abundance and structure were evaluated by molecular approaches based on quantitative Polymerase Chain Reaction (qPCR) and Ribosomal Intergenic Spacer Analysis (RISA). The microbial communities did not present significant quantitative differences, but the environmental impact caused by deforestation changed the structure of the bacterial and archaeal communities. Taking into account the percentage of shared OTUs (operational...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: RISA; Soil quality; Land use change; Soil microbial ecology.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162017000100077

Vegetative growth of grain sorghum in response to phosphorus nutrition
Provedor de dados: 63
Autores: Camacho,Rafael; Malavolta,Eurípedes; Guerrero-Alves,José; Camacho,Tomás.
Morphological variables such as phytomass, plant height, leaf area, number of leaves, have been used to express the influence of mineral nutrients on plant growth patterns, since the vegetative development responds, in general, favorably to fertilizer applications. This work evaluates the effect of P on both, some morphological characteristics and total [P] in the shoot of eight grain sorghum (Sorghum bicolor L. Moench) genotypes. Genetic materials were grown in nutrient solution under three concentrations of P (0; 0.5 and 1.0 mmol L-1). Plants were harvested 41 days after sowing, and leaf area per plant (LA), number of leaves (NL) per plant, root volume (RV), plant height (PH), root dry matter (RDM), shoot dry matter (SDM), total dry matter (TDM), RDM/SDM...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sorghum; Phosphorus; Leaf area; Plant height; Root volume.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000400022

Comparative analysis for quantification of Citrus Variegated Chlorosis in the field
Provedor de dados: 63
Autores: Gonçalves,Fabrício Packer; Lourenço,Silvia Afonseca; Stuchi,Eduardo Sanches; Hau,Bernhard; Amorim,Lilian.
Citrus Variegated Chlorosis (CVC) caused by Xylella fastidiosa is one of the most important diseases for Brazilian citriculture. The CVC is a vascular disease with a long incubation period and symptoms similar to other disorders, and this factors difficult the CVC quantification in the field. Two methods of CVC assessment were compared in this study. The first method was based on a descriptive rating scale with four ratings, commonly used for the disease quantification. The second one was based on the incidence of symptomatic branches. The quantification of CVC through these two methods was carried out in a 10-year-old 'Natal' sweet orange orchard. The descriptive scale considered the symptoms of the entire plant. The disease incidence was evaluated in 36...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phytopathometry; Ordinal data; Disease assessment.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000500008

Seletividade de combinações de herbicidas latifolicidas com lactofen para a cultura de soja
Provedor de dados: 63
Autores: Souza,Reginaldo Teodoro de; Constantin,Jamil; Velini,Edivaldo Domingues; Montorio,Gilmar Aparecido; Maciel,Cleber Daniel de Goes.
Combinações de herbicidas visam o aumento do espectro de controle de plantas daninhas do complexo florístico, sendo usadas na agricultura com freqüência. Este trabalho teve como objetivo estudar a seletividade das combinações do herbicida lactofen, com bentazon, fomesafen, chlorimuron-ethyl e imazethapyr na cultura da soja, cultivar BR-37. Para isso, foi instalado um experimento de campo em Maringá-PR, em área livre de plantas daninhas evitando assim possíveis interferências sobre a cultura. Os tratamentos combinados foram obtidos aplicando-se de maneira contínua cada produto e suas doses a 75, 50 e 25% da dose comercial, seguindo as linhas de soja e novamente, aplicando-os perpendicularmente as mesmas, sendo assim, os locais onde houve o cruzamento e...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phytotoxicity; Lactofen; Chlorimuron-ethyl; Bentazon.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000100015

Biodegradable oil-based polymeric coatings on urea fertilizer: N release kinetic transformations of urea in soil
Provedor de dados: 63
Autores: Bortoletto-Santos,Ricardo; Guimarães,Gelton Geraldo Fernandes; Roncato Junior,Vanderlei; Cruz,Diego Fernandes da; Polito,Wagner Luiz; Ribeiro,Caue.
ABSTRACT: Polymer coatings are used to control the rate of release of plant available nutrients from fertilizers as well as to reduce nutrient losses such as ammonia (NH3) volatilization. Although the literature presents several examples of materials used to coat urea, little is known about nitrogen (N) release properties such as the mechanism involved and phenomena (e.g., pore opening) in the polymer coating. Thus, this study investigated urea release from polyurethane (PU) derived from two renewable raw materials (castor oil and soybean oil), to explain how the oil structure and coating microstructure influence release and urea-N dynamics in soil. The results demonstrated that the profile of urea release and the urea-N mineralization in the soil could be...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Polyurethane; Controlled release; Plant nutrition; Soil fertility; Nitrogen.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000101402

Heterogeneidade dos pontos experimentais de curvas de retenção da água no solo
Provedor de dados: 63
Autores: Moraes,S.O.; Libardi,P.L.; Reichardt,K.; Bacchi,O.O.S.
Em uma área de Terra Roxa Estruturada Latossólica de Piracicaba,SP, foram coletadas 250 amostras de solo com estrutura indeformada à profundidade de 25 cm, segundo um espaçamento regular de 5 m. As amostras foram submetidas às tensões de 5xl0²; 1x10³; 6x10³; 1x10(4) (Funil de Haines) e pressões de 3x10(4); 8x10(4); 3x10(5) e 1,5x10(6) Pa (Câmara de Pressão de Richards) para obtenção das relações entre potencial mátrico e umidade do solo. Assim foram obtidos duzentos e cinqüenta valores de umidade à base de massa (variável dependente) para cada valor de tensão fixado (variável independente), num total de dois mil resultados experimentais. Utilizaram-se medidas de posição (moda, mediana e média aritmética), variabilidade (amplitude total, amplitude...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Curva de retenção da água no solo; Variabilidade; Estatística descritiva; Terra roxa estruturada latossólica.
Ano: 1993
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161993000300011

Feasibility of cultivation of sugarcane in agroforestry systems
Provedor de dados: 63
Autores: Pinto,Luís Fernando Guedes; Bernardes,Marcos Silveira; Sparovek,Gerd.
Brazil is the world's main sugarcane producer and the production system has changed abiding to legal and technical recommendation. In Piracicaba many smallholders grow sugarcane in steep areas. Under such situation, mechanization at harvest makes cultivation impossible. This work assess the viability of agroforestry systems on joining crop production and conservation of natural resources. Soils at 12-20% slope class were identified, tree species which could be cultivated along with sugarcane were selected, and the design of the systems to be adopted was evaluated. Identified area occupies 11,556 ha and the most representative soil types are Typic Kandiuldult and Lithic Hapludoll. The exotic species coconut, eucalyptus, pejibaye and rubber, and eight native...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Contourhedgerows; Erosion; Exotic trees; Native trees.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000300012

Climatic risk of grape downy mildew (Plasmopara viticola) for the State of São Paulo, Brazil
Provedor de dados: 63
Autores: Hamada,Emília; Ghini,Raquel; Rossi,Paulo; Pedro Júnior,Mário José; Fernandes,Jeferson Lobato.
Viticulture in Brazil has been growing in importance in recent years. In the State of São Paulo, a significant percentage of the production is basically destined to in natura consumption and, more recently, much effort has been made by institutions to revitalize the viticulture in the State. Among fungal diseases, the downy mildew (Plasmopara viticola) is one of the main diseases affecting this crop in Brazil, with extreme damage effects on its production. The objective of this study was to estimate the incidence of the downy mildew on grape under the climatic conditions of the State of São Paulo, based on a mathematical model and using Geographical Information System - GIS tools. The study considered the months from September to April, a period in which...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vitis spp.; Geographical Information System; Temperature; Relative humidity; Leaf wetness duration.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000700010

Quality function deployment (QFD) reveals appropriate quality of charcoal used in barbecues
Provedor de dados: 63
Autores: Dias Júnior,Ananias Francisco; Andrade,Carlos Rogério; Milan,Marcos; Brito,José Otávio; Andrade,Azarias Machado de; Souza,Natália Dias de.
ABSTRACT: Charcoal is an important product widely used in food preparation in many parts of the world, both in developing and developed countries. However, most of the time, the main qualitative characteristics for consumers and the environment are not considered during production. Developing energy-efficient products for food preparation has been a constant pursuit of the charcoal supply chain and the aim of this study was to interact with charcoal consumers to become conversant with and classify the characteristics suitable for barbecue use. To achieve our objectives, we used the quality function deployment (QFD) method. The qualitative needs were deployed together with a multidisciplinary team assembled through interviews with several charcoal...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Charcoal grill; Quality management; Product development; Sustainable; Clean energy production.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000601001

Genetic analysis of wheat grains using digital imaging and their relationship to enhance grain weight
Provedor de dados: 63
Autores: Ali,Ahmad; Ullah,Zahid; Alam,Naveed; Naqvi,S.M. Saqlan; Jamil,Muhammad; Bux,Hadi; Sher,Hassan.
ABSTRACT: Phenomic characterization through digital imaging (DI) can capture the three dimensional variation in wheat grain size and shape using different image orientations. Digital imaging may help identifying genomic regions controlling grain morphology using association mapping with simple sequence repeats (SSRs) markers. Accordingly, seed shape phenotypic data of a core collection of 55 wheat genotypes, previously characterized for osmotic and drought tolerance, were produced using computer based Smart grain software. Measured dimensions included seed volume, area, perimeters, length, width, length to width ratio, circularity, horizontal deviation from ellipse (HDEV), vertical deviation from ellipse (VDEV), factor form density (FFD) etc. The thousand...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Synthetic derived bread wheats; Seed digital imaging; Path analysis; Marker-trait association.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000601101

Occurrence of Dinarmus basalis in Callosobruchus analis in stored soybean in São Paulo, Brazil
Provedor de dados: 63
Autores: Costa,Valmir Antonio; Guzzo,Élio César; Lourenção,André Luiz; Tavares,Márcio Aurélio Garcia Correia; Vendramim,José Djair.
Callosobruchus analis (F.) is considered an important pest in several countries in Africa, Asia and Oceania. It has been observed infesting seeds belonging to 15 Leguminosae genera, including peanut, bean, chickpea, pea, cowpea, and soybean. One of its main natural enemies is the parasitoid Dinarmus basalis (Rondani) (Hymenoptera: Pteromalidae), whose control efficiency has already been demonstrated in several studies. This paper records the occurrence of C. analis and its parasitoid, D. basalis, in stored soybean of the state of São Paulo, Brazil.
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Glycine max; Hymenoptera; Pteromalidae; Coleoptera; Bruchidae.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000300014

Efeitos do agrostemin em plantas de soja (Glicine max (L.) Merrill cv. IAC-8), através dos parâmetros fisiológicos: razão de área foliar, taxa assimilatória líquida e taxa de crescimento relativo
Provedor de dados: 63
Autores: Fernandes,A.A. H.; Rodrigues,J.D.; Castro,P.R.C.; Pinho,S.Z. de.
O presente estudo teve por finalidade avaliar o efeito de um estimulante vegetal, Agrostemin, no desenvolvimento de plantas de soja (Glycine max (L.) Merrill cv. IAC-8), através de alguns parâmetros que compõem a análise de crescimento. O experimento foi conduzido em casa de vegetação. Foram estudados seis tratamentos, correspondentes às seguintes dosagens, épocas e formas de aplicação: testemunha (T1); 0,125g de Agrostemin/100g sementes (T2); 0,125g de Agrostemin/l00g sementes e pulverização foliar à 333 ppm (T3); 0,125g de Agrostemin/100g sementes e pulverização foliar à 500 ppm (T4); pulverização foliar à 333 ppm (T5) e pulverização foliar à 500 ppm (T6). Realizaram-se três épocas de coleta, à intervalos de 14 dias. O experimento foi em delineamento...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycine max L.; Agrostemin; Análise de crescimento.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000200023

Suplementação de vitamina C associada à densidade de criação no desempenho de frangos de corte
Provedor de dados: 63
Autores: Silva,R.D.M.; Menten,J.F.M.; Cardoso,M.K.; Ghirardi,G.G.
Avaliou-se o efeito da suplementação da vitamina C (75 e 150 mg/kg) na alimentação de frangos de corte machos sob condições de estresse de calor e superlotação. As aves foram criadas sobre "cama" de cavaco de madeira nas lotações de 10 e 14 aves/m². O delineamento experimental foi o inteiramente casualizado em esquema fatorial (3 níveis de vitamina C na ração e 2 lotações), com 5 repetições. Os resultados indicaram que o aumento da lotação de criação prejudicou (P&lt;0,05) o ganho de peso das aves no período final da criação. A conversão alimentar dos 35 aos 48 dias de idade foi melhor (P &lt;0,01) nas aves que receberam suplementação de 75 mg/kg em comparação com o controle. A suplementação de 150 mg/kg deu média de conversão alimentar melhor do que a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vitamina C; Estresse; Calor; Lotação; Frangos de corte.
Ano: 1993
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161993000300025

Inbreeding in two maize subpopulations selected for tassel size
Provedor de dados: 63
Autores: Farias Neto,Austeclinio L. de; Miranda Filho,José Branco de.
The present work was based on the evaluation of full sib and S1 progenies from the maize (Zea mays L.) population ESALQ-PB1 after six cycles of divergent selection for tassel size. The following traits were analyzed: plant height , ear height, tassel branch number, tassel length, and tassel weight. For all traits, the experimental units were means of three plants per plot. Progenies were evaluated in eleven experiments (completely randomized blocks) with three replications in Piracicaba -- SP, Brazil. Means of inbred (m1) and non-inbred (m0) progenies were used to estimate inbreeding depression (I = m1 -- m0) and the contribution of homozygotes (mu0 + a*) and heterozygotes (d*) to the population mean. Considering the five traits under study, inbreeding...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Inbreeding depression; Divergent selection; Tassel characters.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000300018

EFEITO DE ÉPOCAS DE DEFICIÊNCIA HÍDRICA NA EFICIÊNCIA DO USO DO NITROGÊNIO DA CULTURA DO FEIJÃO cv. IMBABELLO
Provedor de dados: 63
Autores: CALVACHE,A.M.; REICHARDT,K.
Visando identificar estádios da cultura de feijão que apresentam a menor sensibilidade ao estresse de água no solo, nos quais a irrigação pode ser omitida sem um significativo decréscimo na eficiência de uso de nitrogênio e na produtividade final, foi realizado experimento em um solo franco arenoso (Typic Haplustoll) na Estação Experimental da Universidade Central do Equador, "La Tola", em Tumbaco-Pichincha, Equador, entre julho e novembro de 1994. Os tratamentos consistiram da combinação de sete regimes de irrigação, incluindo irrigação ótima durante todo o ciclo, irrigação deficiente durante todo o ciclo, irrigação tradicional da região, deficiência hídrica no período vegetativo, na floração e formação de vagens, no enchimento de vagens e na maturidade;...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Eficiência de uso de água; Fixação de nitrogênio; 15N; Cultura de feijão; Phaseolus vulgaris.
Ano: 1996
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161996000200025

Efeitos de métodos de colheita e da localização dos frutos na planta sobre a ocorrência de sementes duras em quiabeiro (Abelmoschus esculentus (L.) Moench)
Provedor de dados: 63
Autores: Setubal,J. W.; Zanin,A.C.W.; Nakagawa,J.
A ocorrência de sementes duras em quiabeiro (Abelmoschus esculentus (L.) Moench) foi estudada em função da colheita única dos frutos na senescência das plantas ou da colheita periódica dos frutos no estádio de maturação morfológica. As cultivares utilizadas foram "Amarelinho", "Santa Cruz-47" e "Campinas-2 IAC 4076" e os frutos foram separados em aqueles provenientes da haste principal e os oriundos dos ramos laterais. A porcentagem de sementes duras foi avaliada por meio do teste padrão de germinação e os dados obtidos permitiram verificar que o método de colheita única aumentou a ocorrência de sementes duras e, pelo fato de "Amarelinho" não apresentar essa característica, esse método pode ser utilizado para a mesma, com redução nos custos de produção de...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Quiabeiro; Abelmoschus esculentus; Cultivares; Sementes duras.
Ano: 1994
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000300019

Characterization of Brazilian Syrah winter wines at bottling and after ageing
Provedor de dados: 63
Autores: Mota,Renata Vieira da; Peregrino,Isabela; Rivera,Stephanie Patricia Teran; Hassimotto,Neuza Mariko Aymoto; Souza,André Luiz de; Souza,Claudia Rita de.
ABSTRACT: Double pruning extended the harvest season of wine grape (Vitis vinifera L.) to dry winter, enabling production of high quality wines in the southeastern Brazil. Winter harvest allows grapes to fulfill not only technological maturation, but also phenolic ripeness. Winter wines from Syrah grapes harvested from eight vineyards in southeastern Brazil during three harvests were analyzed for their chemical and aromatic composition after bottling and after ageing for 20, 30, and 42 months in bottle. Winter wines have high content of total phenolic compounds, which remained almost constant through ageing, as well as color intensity. Malvidin 3-O-glucoside stood out among anthocyanins, remaining 5-10 % after 39 months of ageing. Moreover, malvidin...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Double-pruning; Composition; Color; Phenolics; Aroma.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000300903

Zoneamento agroecológico para a região de Ribeirão Preto utilizando um sistema de informações geográficas
Provedor de dados: 63
Autores: Martorano,Lucieta G.; Angelocci,Luiz Roberto; Vettorazzi,Carlos Alberto; Valente,Roberta de Oliveira Averna.
Objetivando contribuir com a metodologia de identificação de potencialidades de uso das terras, este trabalho apresenta uma proposta de zoneamento agroecológico da quadrícula de Ribeirão Preto, SP, localizada entre as coordenadas de 21o00'S a 21o30'S e 47o30'W a 48o00'W, com base em características de solo, relevo e clima, utilizando-se de um Sistema de Informações Geográficas. Para caracterizar o regime térmico-hídrico da área utilizou-se os dados de temperatura do ar e de chuva, de 22 localidades, referentes ao período de 1967 a 1996. De acordo com os critérios adotados, quanto a capacidade de uso das terras, o zoneamento identificou seis unidades de utilização da área: agricultura (I); agricultura (II); agricultura (III); pecuária; agrossilvicultura e...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Clima; Relevo; Solo; Geoprocessamento; SIG.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000300032

Advances in induced resistance by natural compounds: towards new options for woody crop protection
Provedor de dados: 63
Autores: Llorens,Eugenio; García-Agustín,Pilar; Lapeña,Leonor.
ABSTRACT: The activation of defensive responses of plants is a promising tool for controlling pests in conventional agriculture. Over the last few years, several compounds have been studied to protect crops from pests, without displaying direct toxicity for pathogenic organisms. These compounds have the ability to induce a priming state on the plants that results in resistance (or tolerance) against subsequent infection by a pathogen. In terms of molecular response, induced plant defense involves a broad number of physical and biochemical changes such as callose deposition or phenolic compounds, activation of salicylic and/or jasmonic acid pathways or synthesis of defense-related enzymes. Despite the large number of studies performed to ascertain the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Priming; Enhanced resistance; Pest management; Induced systemic resistance; Systemic acquired resistance.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162017000100090

Avaliação da higroscopicidade de fertilizantes e corretivos
Provedor de dados: 63
Autores: Alcarde,J.C.; Malavolta,E.; Borges,A.L.; Muniz,A.S.; Veloso,C.A.; Fabrício,A.C.; Viegas,I. De J.M.
Visando determinar a quantidade de água absorvida em função da umidade do ambiente e do tempo de exposição por alguns fertilizantes simples, misturas de fertilizantes e corretivos, foram colocadas em três ambientes de umidade relativa constante de 70,4%, 80,5% e 88,8% . As amostras foram pesadas após 0, 3, 6, 24, 48 e 72 horas determinando a porcentagem de água absorvida. A absorção de água pelos produtos aumentou com o aumento da umidade relativa do ar e do tempo de exposição. Todos os materiais absorveram alguma umidade no menor tempo e na menor umidade relativa estudados, isto é, 3 horas de 70,4%, porém essa absorção foi insignificante nos casos do sulfato de amônio, fosfato diamônico, fosfato natural parcialmente acidulado, cloreto de potássio, sulfato...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fertilizantes; Corretivos; Higroscopicidade.
Ano: 1992
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161992000400018

Physiological and symbiotic diversity of Cupriavidus necator strains isolated from nodules of Leguminosae species
Provedor de dados: 63
Autores: Florentino,Ligiane Aparecida; Jaramillo,Paula Marcela Duque; Silva,Karina Barroso; Silva,Jacqueline Savana da; Oliveira,Silvia Maria de; Moreira,Fatima Maria de Souza.
Biological nitrogen fixation, performed by diazotrophic bacteria, plays an important role in the maintenance of agricultural systems, as it contributes with significant amounts of the nitrogen (N) needed for plant growth, totally or partially exempting the use of industrial N fertilisers. Twenty-five bacterial strains isolated from nodules of Leucaena leucocephala and Phaseolus vulgaris trap plants were studied. These nodules were formed after inoculation with suspensions of soil samples collected close to the root system of Sesbania virgata. In previous studies, these bacteria were identified as Cupriavidus necator. This study aimed to evaluate the ability of these strains to fix N2 in the free-living state and to use carbon (C) sources; their resistance...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Symbiosis; Β-proteobacteria; Antibiotic resistance.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162012000400003

EFEITO RESIDUAL DE FERTILIZANTES FOSFATADOS PARA O ARROZ: AVALIAÇÃO DO FÓSFORO NA PLANTA E NO SOLO POR DIFERENTES EXTRATORES
Provedor de dados: 63
Autores: Rossi,Carla; Anjos,Ana Rosa Martins dos; Camargo,Monica Sartori de; Weber,Oscarlina Lucia Santos; Imhoff,Silvia; Malavolta,Eurípedes.
O objetivo foi avaliar o efeito residual de fertilizantes fosfatados e a eficiência de extratores químicos na avaliação da disponibilidade de fósforo no solo e estudar o aproveitamento do fósforo dos adubos fosfatados. Quatro fontes de P (Superfosfato Triplo, Termofosfato Yoorin, Fosfato Natural da Carolina do Norte e Fosfato Natural de Arad) e três doses (50, 100 e 200 mg dm-3) foram aplicadas em Latossolo Vermelho Amarelo, onde foram cultivadas plantas de arroz. Houve efeito residual das doses de fósforo aplicadas, resultando em aumento de matéria seca; o teor de fósforo extraído do solo aumentou com as doses de fósforo; o extrator Mehlich 1 apresentou maiores valores de P para os fosfatos naturais. Para as fontes solúveis, a resina extraiu mais fósforo,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fertilizantes fosfatados; Fósforo; Arroz; Extratores.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000100007

Macro scale analysis of Syrah vineyards under winter growing cycles: Agronomical and ecophysiological responses
Provedor de dados: 63
Autores: Brant,Luciana Alves Caldeira; Souza,Cláudia Rita de; Mota,Renata Vieira da; Fernandes,Fernanda de Paula; Gonçalves,Mariana Gabriele Marcolino; Menezes,Michele Duarte de; Peregrino,Isabela; Curi,Nilton; Regina,Murillo de Albuquerque.
ABSTRACT: In Southeast Brazil, the change of grape harvest from wet summer to dry winter through double-pruning management has improved the quality of wines, currently denominated winter wines. In order to better understand the influences of soil, macroclimate, and vineyard management in winter wines, we investigated seven vineyards in the states of Minas Gerais (Três Corações – TC, Três Pontas – TP, Cordislândia – COR, São Sebastião do Paraíso – SSP and Andradas – AND) and São Paulo (Itobi – ITO and Espirito Santo do Pinhal – PIN) during three consecutive growing seasons. The vineyards are located in warm temperate zones and grouped in four soil types: Acrudox in TC, AND and SSP, Hapludox in TP; Hapludult in AND and PIN; Eutrudept in ITO. The high clay...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vitis vinifera; Double-pruning grape composition; Vegetative vigor; Terroir.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000600601

Clustering of ingredients with amino acid composition similar to the nutritional requirement of Nile tilapia
Provedor de dados: 63
Autores: Bicudo,Álvaro José de Almeida; Pinto,Luis Fernando Batista; Cyrino,José Eurico Possebon.
The search for balanced diets, which may elicit improved growth of fish, requires appropriate selection of available protein sources. This study aims at clustering feedstuffs according to amino acid profile, determining which ones show essential amino acids (EAA) profiles closer to the ideal dietary amino acids requirements of Nile tilapia (Oreochromis niloticus), and studying the relationship among amino acids feedstuffs groups. Tabled data on EAA more cystine and tyrosine, in relation to lysine contents, of 40 feedstuffs ordinarily used to formulate fish diets were studied. Feedstuffs were grouped according to amino acids profile by cluster analysis of Euclidean distances. The principal components analysis was used to determine the relationship among...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Feedstuff; Fish; Multivariate analysis; Nutrition; Protein.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000500004

Atividade ovicida de extratos aquosos de meliáceas sobre a mosca branca Bemisia tabaci (Gennadius) biótipo B em tomateiro
Provedor de dados: 63
Autores: Souza,Antonio Pancrácio de; Vendramim,José Djair.
A mosca branca Bemisia tabaci (Gennadius) biótipo B atualmente é uma das principais pragas do tomateiro. O uso de extratos botânicos no controle desse inseto é uma alternativa promissora, mas que ainda precisa ser melhor pesquisada. O presente trabalho teve como objetivo determinar a bioatividade de extratos aquosos de folhas de Melia azedarach L. e de ramos de Trichilia pallida Swartz, sobre a mosca branca Bemisia tabaci (Gennadius) biótipo B, criada em tomateiro. Foram realizados dois experimentos, avaliando-se a mortalidade e duração das fases de ovo e ninfa, após o tratamento da fase de ovo com os referidos extratos. No primeiro experimento, foram testadas as concentrações de 1 e 2% (p/v), acrescentando-se a concentração de 3% no segundo experimento....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Melia azedarach; Trichilia pallida; Bemisia tabaci; Mosca branca.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000300005

Morphogenetic responses of embryo culture of wheat related to environment culture conditions of the explant donor plant
Provedor de dados: 63
Autores: Dodig,Dejan; Zorić,Miroslav; Mitić,Nevena; Nikolić,Radomirka; King,Stephen R.; Lalević,Blažo; Šurlan-Momirović,Gordana.
Availability of immature embryos as explants to establish wheat (Triticum aestivum L.) by tissue culture can be limited by climatic factors and the lack of high quality embryos frequently hampers experimentation. This study evaluates the effects of rainfall, various temperature-based variables and sunshine duration on tissue culture response (TCR) traits including callus formation (CF), regenerating calli (RC), and number of plants per embryo (PPE) for 96 wheat genotypes of worldwide origin. The objectives of this study were to evaluate the significance of a particular climatic factor on TCR traits and to determine the period of wheat growth during which these factors were the most effective. The genotypes were grown in an experimental field during three...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Triticum aestivum L.; Biplot; Correlation analysis; Environment variable; Growth period.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000300007

Calibration of a capacitance probe in a Paleudult
Provedor de dados: 63
Autores: Silva,Cláudio Ricardo da; Andrade Júnior,Aderson Soares de; Alves Júnior,José; Souza,Antonio Barros de; Melo,Francisco de Brito; Coelho Filho,Maurício Antonio.
The use of capacitance sensors is one of the methods used to quantitatively measure soil water contents (theta, m³ m-3). Sensors provide readings at desired depths and time intervals. A capacitance probe (Diviner 2000) was calibrated for a Rhodic Paleudult from the Piaui State, Brazil. Six access tubes were installed in a 5 × 2 m grid arrangement. Three moisture levels (saturated, moist and dry) were used in two replications. Probe readings and soil samplings to determine theta were made at 0.1 m depth intervals down to a depth of 1.0 m. A power calibration equation was developed for each depth as well as for the entire soil profile (Root Mean Square Error = 0.014, R² = 0.93) for a theta range of 0.068 to 0.264 m³m-3. A separate calibration for each depth...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: FDR probe; Sensor; Irrigation; Soil water content.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000600012

Diallel analysis of maize resistance to Phaeosphaeria maydis
Provedor de dados: 63
Autores: Silva,Herberte Pereira da; Moro,José Roberto.
In breeding programs directed towards genetic resistance against diseases, the estimation of genetic parameters that control resistance allows the introduction of resistance into suscetible germplasm to be clearly focused. The purposes of this study were to estimate heterosis effects, and the general (GCA) and specific (SCA) combining abilities by using two rating methods for resistance to Phaeosphaeria maydis in a diallel analysis of 36 F1 maize hybrids and their nine inbred lines. Trials were conducted in three environments. Disease severity was evaluated in the whole plant (PI) and in the leaf positioned just below the point of insertion of the main ear (AFA). The trials followed a randomized block design with plots represented by a 5 m long rows....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays L.; Genetic resistance; Heterotic effects; General and specific combining ability.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000100007

Economic analysis of agricultural enterprises in Turkey according to their level of success
Provedor de dados: 63
Autores: Kizilaslan,Halil; Adiguzel,Omer.
In this study, agricultural enterprises in Turhal, Tokat were grouped based on their degree of success, their structural characteristics have been identified and their outcomes of activities discussed. The objective of the study was to determine the aspects that render successful agricultural enterprises different from other agricultural enterprises. The point to be achieved through the study is to assist agricultural enterprises with a more effective utilization of existing means in order to help them to develop. Data has been collected from 71 agricultural enterprises, which have been determined by Neyman's Method that is a stratified sampling method, via questionnaires. The Criterion of Agricultural Income Per Enterprise Land Decar has been applied for...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Tokat; Agricultural income; Successful enterprise.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000200004

Performance and radial distribution profiles of a variable flow rate sprinkler developed for precision irrigation
Provedor de dados: 63
Autores: Armindo,Robson André; Botrel,Tarlei Arriel.
Variable rate sprinklers (VRS) have been developed to promote localized water application of irrigated areas. In Precision Irrigation, VRS permits better control of flow adjustment and, at the same time, provides satisfactory radial distribution profiles for various pressures and flow rates are really necessary. The objective of this work was to evaluate the performance and radial distribution profiles of a developed VRS which varies the nozzle cross sectional area by moving a pin in or out using a stepper motor. Field tests were performed under different conditions of service pressure, rotation angles imposed on the pin and flow rate which resulted in maximal water throw radiuses ranging from 7.30 to 10.38 m. In the experiments in which the service...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Scheduling irrigation; Central pivot; Linear irrigation system; Automation.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162012000200012

Fruit characterization of high oil content avocado varieties
Provedor de dados: 63
Autores: Gómez-López,Vicente Manuel.
To expand the data bank on avocado (Persea americana Mill.) varieties all over the world, and to select good varieties for commercial or improving purposes, a partial fruit characterization of 13 high oil content (11.23-18.80%) was performed. The chosen varieties are growing in a Venezuelan germplasm bank: Fuerte, Peruano, Lula, Ortega, Red Collinson, Alcemio, Araira 1, Pope, Ettinger, Gripiña 5, Barker, Duke, and Ryan. They were characterized for pulp oil and moisture; weight (whole fruit, seed, pulp and peel); length, width and fruit shape; peel characteristics (roughness, color and hand peeling); and ripeness time. The variety Ryan showed the highest oil content (18.80%) and calorific value (191 Kcal/100 g wet flesh). Avocado varieties grown in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Avocado; Fruit characterization.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000200030

Field spatial and temporal patterns of soil water content and bulk density changes
Provedor de dados: 63
Autores: Timm,Luís Carlos; Pires,Luiz Fernando; Roveratti,Renato; Arthur,Robson Clayton Jacques; Reichardt,Klaus; Oliveira,Júlio Cesar Martins de; Bacchi,Osny Oliveira Santos.
Soil water content (theta) and bulk density (rhos) greatly influence important soil and plant processes, such as water movement, soil compaction, soil aeration, and plant root system development. Spatial and temporal variability of theta and rhos during different periods of the year and different phases of crops are of fundamental interest. This work involves the characterization of spatial and temporal patterns of theta and rhos during different climatic periods of year, aiming to verify whether there are significant temporal changes in rhos at the soil surface layer when submitted to wetting and drying cycles. The field experiment was carried out in a coffee plantation, Rhodic Kandiudalf soil, clayey texture. Using a neutron/gamma surface probe, theta...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Neutron/gamma surface probe; Wetting/drying cycles; Spatial and temporal variability.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000100009

Effects of gamma radiation on the sterility and behavioral quality of the caribbean fruit fly, Anastrepha suspensa (Loew) (Diptera:Tephritidae)
Provedor de dados: 63
Autores: Walder,J.M.M.; Calkins,C.O.
Pupae of Anastrepha suspensa (Loew) were irradiated 2 days before adult eclosión in an air atmosphere with 15, 20, 25, 30, 50 and 70 Gy of gamma radiation (Co-60). The radiation effects on sterility and other parameters of quality and behavior of males and females of caribfly were established. Males became fully sterile with a dose of 50 Gy and females laid no eggs when exposed to 25 Gy. Radiation had no significant effect on adult eclosion, sex ratio, flight ability and irritability, but female mortality was affected significantly by radiation, showing higher survival rates in low dosage treatments. The mating behavior of the males was reduced significantly by increasing the radiation doses.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anastrepha suspensa; Gamma radiation; Sterility; Behavior.
Ano: 1993
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161993000200001

Live and formulated diet evaluation through initial growth and survival of jundiá larvae, Rhamdia quelen
Provedor de dados: 63
Autores: Carneiro,Paulo César Falanghe; Mikos,Jorge Daniel; Schorer,Marianne; Oliveira Filho,Paulo Roberto Campagnoli; Bendhack,Fabiano.
Live diet (LD) dependence and the lack of suitable formulated diets (FD) are major constraints for the expansion of larviculture of many fish species. The low digestibility and nutritional quality of FD are factors that might explain their failure as a stand-alone starter food. To determine whether FD in combination with LD (zooplankton) may efficiently increase larval growth and survival of jundiá (Rhamdia quelen), when compared to fish fed by either types of diet alone, jundiá larvae (5.57 mm; 1.41 mg) were initially stocked into 12 10-L aquaria (100 larvae per aquarium). Replicate groups (n=4) were fed ad libitum one of the three diets for 20 (when fed FD) or 48 days (when fed LD or the combined diets). Larvae fed FD alone presented significantly lower...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Feed; Zooplankton; Nutrition; Silver catfish.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000400002

Biomass, virus concentration, and symptomatology of cucurbits infected by mild and severe strains of Papaya ringspot virus
Provedor de dados: 63
Autores: Pacheco,Davi Andrade; Rezende,Jorge Alberto Marques; Piedade,Sônia Maria de Stefano.
Pre-immunization with mild strains of Papaya ringspot virus - type W (PRWV-W) has allowed the mosaic disease to be controlled in different cucurbit species, with increases in marketable fruit yield. The objective of this study was to compare virus concentration, biomass and symptomatology of 'Caserta' zucchini squash, 'Menina Brasileira' long-neck squash and 'Crimson Sweet' watermelon plants infected by three mild strains and one severe strain of PRSV-W. Plants were inoculated at the cotyledonary stage, under greenhouse conditions, sampled at 7, 14, 21, 28 and 35 days after inoculation (DAI), and analyzed by PTA-ELISA. The severity of the symptoms was scored according to a scale from 1 to 5, and the fresh and dry biomass of the aerial part of the plants...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: PTA-ELISA; Cucurbita pepo; Cucurbita moschata; Citrullus lanatus.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000400013

Establishing management zones using soil electrical conductivity and other soil properties by the fuzzy clustering technique
Provedor de dados: 63
Autores: Molin,José Paulo; Castro,Cesar Nunes de.
The design of site-specific management zones that can successfully define uniform regions of soil fertility attributes that are of importance to crop growth is one of the most challenging steps in precision agriculture. One important method of so proceeding is based solely on crop yield stability using information from yield maps; however, it is possible to accomplish this using soil information. In this study the soil was sampled for electrical conductivity and eleven other soil properties, aiming to define uniform site-specific management zones in relation to these variables. Principal component analysis was used to group variables and fuzzy logic classification was used for clustering the transformed variables. The importance of electrical conductivity...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Precision agriculture; Soil physical properties; Fuzziness.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000600001

Influência da temperatura e do polietileno no armazenamento de frutos de goiabeira serrana (Feijoa sellowiana Berg.)
Provedor de dados: 63
Autores: Hoffmann,A.; Nachtigal,J.C.; Kluge,R.A.; Bilhalva,A.B.
Objetivando verificar o efeito de três temperaturas (0°C, 2°C e ambiente) e da embalagem de polietileno perfurado no armazenamento, utilizou-se frutos de goiabeira serrana (Feijoa sellowiana Berg), provenientes de plantas nativas de Vacaria, RS, colhidos em meados de março de 1993 e mantidos em câmaras frias. O tempo de armazenamento foi de 21 e 28 dias, mais 2 dias de comercialização simulada. À temperatura ambiente, a durabilidade dos frutos foi próxima a uma semana, não tendo sido possível sua avaliação. Aos 21 dias, as frutas mantidas a 2°C e embaladas com polietileno tiveram menor teor de SST (Sólidos Solúveis Totais) e menor perda de peso que as dos demais tratamentos; a ATT (Acidez Total Titularei) foi menor na temperatura de 2°C, independente do...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Feijoa sellowiana Berg.; Frigoconservação.
Ano: 1994
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000300031

New opportunities for developing tomato varieties with enhanced carotenoid content
Provedor de dados: 63
Autores: Leiva-Brondo,Miguel; Valcarcel,Mercedes; Martí,Raúl; Roselló,Salvador; Cebolla-Cornejo,Jaime.
ABSTRACT The development of varieties with a high content of antioxidant compounds, such as carotenoids, has become a major focus in the marketing of tomato. Several mutants have been used in the development of high pigment varieties, but the significant influence of the environment on carotenoid content and the presence of negative side effects in vegetative growth and yield have limited the success of these variants. Consequently, the identification of alternative sources of variation in the quest for high carotenoid content is ongoing. In this study, 12 accessions of Solanum lycopersicum (including the former var cerasiforme) and S. pimpinelifolium have been evaluated in three different environments: open field and glasshouse cultivation at two sites....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Solanum lycopersicum; Functional quality; Lycopene; Β-carotene; Genetic resources.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000600512

Mechanized methods for harvesting residual biomass from Mediterranean fruit tree cultivations
Provedor de dados: 63
Autores: Velázquez-Martí,Borja; Fernández-González,Elena; Callejón-Ferre,Ángel Jesús; Estornell-Cremades,Javier.
This study evaluates the technology and work systems used in order to harvest residual biomass from pruning in the specific conditions of Mediterranean fruit orchards (narrow distances between crop-rows). Harvesting has been divided into several types of operations - pruning, biomass alignment between crop tracks, biomass concentration in piles, chipping and bundling - which have been analyzed in five Mediterranean cultivations for three years. Altogether, three types of pruning have been analyzed: Manual, previous mechanical followed by manual, and fully mechanical; Two types of alignment: Manual and mechanical; Three concentration systems: Manual, tractor with a rake and a forwarder; Four chipping work organization systems: chipper driven inside orchard...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Logistic biomass; Pruning; Bioenergy.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162012000300002

Use of AFLPS to distinguish landraces of pejibaye (Bactris gasipaes) in brazilian Amazonia
Provedor de dados: 63
Autores: Clement,Charles R.; Sousa,Nelcimar Reis; Rodrigues,Doriane Picanço; Astolfi-Filho,Spártaco; Moreno,Yolanda Núñez; Pascual,Vicente Torres; Rodríguez,Francisco Javier Gallego.
Although the first inhabitants of western Amazonia domesticated pejibaye (Bactris gasipaes Kunth, Palmae) or peach palm for its fruits, today it is widely planted for its heart-of-palm. Like other domesticates, pejibaye presents a complex hierarchy of landraces developed before the conquest of the Americas. The existence of three landraces (Pará, Solimões, Putumayo) was proposed along the Amazonas and Solimões Rivers, Brazil, based on morphological characteristics. There are some questions remaining about the intermediate landrace being an artifact of the morphometric analysis. AFLPs were used to evaluate the relationships among samples of these putative landraces. DNA was extracted from 99 plants representing 13 populations maintained in the Pejibaye...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Molecular markers; Population differentiation; Genetic resources; Genetic analysis.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000400019

MANEJO DA IRRIGAÇÃO DA CULTURA DA ALFACE (Lactuca sativa L.) ATRAVÉS DO TANQUE CLASSE A
Provedor de dados: 63
Autores: ANDRADE JÚNIOR,A.S. de; KLAR,A.E.
Com o objetivo de avaliar o efeito de diferentes níveis de irrigação, baseados em frações da evaporação do Tanque Classe A (ECA) (0,25; 0,50; 0,75 e 1,00) sobre o comportamento produtivo da cultura da alface, variedade "Mesa 659" (tipo americana), cultivada em uma estufa plástica e irrigada por gotejamento, foi conduzido um experimento durante o período de julho a setembro de 1993. O comportamento produtivo foi avaliado através da determinação da matéria fresca (MFP), produtividade (PROD) e eficiência do uso de água (EUA). Os resultados de MFP e PROD mostraram resposta quadrática, indicando acréscimo em ambos à medida que aumentaram as lâminas de irrigação aplicadas até o nível 0,75 da ECA, apresentando valores máximos de 818,72 g e 90,97 t.ha-1,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Alface; Irrigação; Manejo; Tanque classe A.
Ano: 1997
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161997000100005

Levantamento de solos e interpretação fotográfica dos padrões desenvolvidos em solos originados do arenito de Bauru
Provedor de dados: 63
Autores: França,G.V. de; Demattê,J.A.M.
Com o auxílio de fotografias aéreas na escala 1:25.000, foram traçadas as redes de drenagem e posteriormente obtidos os parâmetros quantitativos necessários para a interpretação para fins pedológicos. A área estudada, com tamanho em torno de 700 km² está localizada no Oeste do Estado de São Paulo na região compreendida entre as cidades de Rancharia, Bastos, Tupâ e Quatá, cortada pelo Rio do Peixe, cujo substrato é constituído pelo arenito de Bauru. Foi feito o estudo das bacias hidrográficas de terceira ordem de ramificação onde foram analisados o número, comprimento total e comprimento médio de segmentos de rios em amostras constituídas por bacias e por amostras circulares. Os valores da densidade de drenagem, principalmente das áreas circulares,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Levantamento de solos; Fotointerpretação pedológica; Densidade de drenagem.
Ano: 1993
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161993000100012

Root systems and soil microbial biomass under no-tillage system
Provedor de dados: 63
Autores: Venzke Filho,Solismar de Paiva; Feigl,Brigitte Josefine; Piccolo,Marisa de Cássia; Fante Jr.,Lorival; Siqueira Neto,Marcos; Cerri,Carlos Clemente.
Some root parameters such as distribution, length, diameter and dry matter are inherent to plant species. Roots can influence microbial population during vegetative cycle through the rhizodeposits and, after senescence, integrating the soil organic matter pool. Since they represent labile substrates, especially regarding nitrogen, they can determine the rate of nutrient availability to the next crop cultivated under no-tillage (NT). The root systems of two crop species: maize (Zea mays L.) cultivar Cargill 909 and soybean [Glycine max (L.) Merr.] cultivar Embrapa 59, were compared in the field, and their influence on spatial distribution of the microbial C and N in a clayey-textured Typic Hapludox cultivated for 22 years under NT, at Tibagi, State of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Root distribution; Maize; Soybean; Carbon; Nitrogen.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000500011

Assessing climate change effects on gladiola in Southern Brazil
Provedor de dados: 63
Autores: Becker,Camila Coelho; Streck,Nereu Augusto; Uhlmann,Lilian Osmari; Cera,Jossana Ceolin; Ferraz,Simone Erotildes Teleginski; Silveira,Waleska Bolson; Balest,Darlan Scapini; Silva,Lucas Ferreira da.
ABSTRACT Gladiola ( Gladiolus × grandiflorus Hort.) is an important cut flower for small farmers in Brazil. While the El Niño Southern Oscillation, which causes interannual variability to air temperature in Southern Brazil, can shift the optimum planting window of gladiola, an increase in temperature due to climate change can accelerate gladiola flowering and cause injuries by heat. The objective of this study was to assess the potential climate change effects on gladiola optimum planting date for specific market dates and investigate injuries occurrence on spikes in the Rio Grande do Sul State, Brazil. Field experiments were conducted from 2016 to 2018 at four different locations across the Rio Grande do Sul State to evaluate the performance of the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Rising temperature; Heat injuries; Spike quality; Planting date.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000100301

Critical points in logistic growth curves and treatment comparisons
Provedor de dados: 63
Autores: Passos,José Raimundo de Souza; Pinho,Sheila Zambello de; Carvalho,Lídia Raquel de; Mischan,Martha Maria.
Several biological phenomena have a behavior over time mathematically characterized by a strong increasing function in the early stages of development, then by a less pronounced growth, sometimes showing stability. The separation between these phases is very important to the researcher, since the maintenance of a less productive phase results in uneconomical activity. In this report we present methods of determining critical points in logistic functions that separate the early stages of growth from the asymptotic phase, with the aim of establishing a stopping critical point in the growth and on this basis determine differences in treatments. The logistic growth model is fitted to experimental data of imbibition of araribá seeds (Centrolobium tomentosum)....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nonlinear regression; Asymptotic regression; Stopping critical level; Seeds imbibition.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162012000500004

Tillage, fertilization systems and chemical attributes of a Paleudult
Provedor de dados: 63
Autores: Dorneles,Evelyn Penedo; Lisboa,Bruno Brito; Abichequer,André Dabdab; Bissani,Carlos Alberto; Meurer,Egon José; Vargas,Luciano Kayser.
Tillage and fertilization methods may affect soil fertility. With the aim of assessing changes in soil chemical properties over a period of ten years, soil samples of a Paleudult were collected over nine seasons at three layer depths (0-5, 5-10, 10-20 cm) and were chemically analyzed. Grain yield and nutrient export in two summer crops, soybean (Glycine max) and corn (Zea mays), in a field experiment set in Eldorado do Sul, in the state of Rio Grande do Sul, Brazil, were determined. Three soil tillage systems were evaluated, conventional (CT), reduced (RT) and no-tillage (NT), combined with mineral (lime and fertilizers) and organic (poultry litter) fertilization. The no-tillage system stood out as compared to the others, especially in the surface layer,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil fertility; Conventional tillage; No-tillage; Organic matter; Cation exchange capacity.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162015000200175

Parasitóides de Cerconota anonella (Sepp., 1830) (Lep.: Oecophoridae) em gravioleira (Annona muricata L.)
Provedor de dados: 63
Autores: Broglio-Micheletti,Sônia Maria Forti; Berti-Filho,Evôneo.
A quantificação de inimigos naturais presentes em uma cultura é importante, porque influi nas decisões a serem tomadas em relação ao Manejo Integrado de Pragas. Assim, este trabalho teve por objetivos identificar e quantificar gêneros de parasitóides de Cerconota anonella (Sepp.) coletados na cultura de graviola entre março de 1997 e abril de 1998 em Maceió, AL (lat.9°S, long. 35°W). O parasitismo foi determinado pela relação entre o número de formas biológicas dos inimigos naturais e o de formas biológicas da praga e dos parasitóides. Os insetos, por ordem de incidência, foram: Apanteles sp. (Hymenoptera: Braconidae), Rhysipolis sp. (Hymenoptera: Braconidae) e Xiphosomella sp. (Hymenoptera: Ichneumonidae). Apanteles sp. predominou durante o período. Os...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Insecta; Hymenoptera; Braconidae; Ichneumonidae; Inimigo natural.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000300031

Chemical and physical fertility indicators of a weakly-structured Ultisol after liming and mulching
Provedor de dados: 63
Autores: Moura,Emanoel Gomes de; Coelho,Kátia Pereira; Freitas,Idelfonso Colares de; Aguiar,Alana das Chagas Ferreira.
In the humid tropic, chemical and physical soil properties that decrease soil's nutrient availability and increase oxygen deficiency are important as restrictions to crop growth. The objective of this study was to evaluate the relations between plant growth and chemical and physical fertility indicators of an Ultisol developed from sediments of the Itapecuru Formation in Central-Northern state of Maranhão, Brazil. An experiment was established with randomized block design, four replicates, and six treatments: 6.0 Mg ha-1 mulch with or without liming; 3.0 Mg ha-1 mulch with or without liming; bare soil with or without liming. Determinations in the plants included leaf area index, net assimilation rate, and the yield parameters: mean number and weight of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays L.; Growth; Yield; Effective porosity.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000600012

Changes in soil organic matter under different land management in misiones province (Argentina)
Provedor de dados: 63
Autores: Piccolo,Gabriel Agustín; Andriulo,Adrián Enrique; Mary,Bruno.
Highly weathered tropical soils rapidly loose soil organic matter (SOM) and may be affected by water erosion and soil compaction after deforestation and intensive cultivation. With the main objective to estimate the SOM balances in a subtropical soil we determined the dynamics of SOM in a degraded yerba mate (Ilex paraguaiensis Saint Hil.) plantation introduced after deforestation and with elephant grass (Pennisetum purpureum L.) as a cover crop. The study site was in Misiones, Argentina, and we use the natural 13C abundance methodology and a descriptive model. The study was conducted on three contiguous 50 x 100 m plots of a typic Kandihumult soil with: (i) native forest, (ii) 50 years of continuous yerba mate monoculture with intensive tillage, and (iii)...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ilex paraguaiensis; Pennisetum purpureum; Natural 13C abundance; Soil carbon; Modelling.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000300009

Heterogeneity of linalool chemotypes of Lippia alba (Mill.) N.E.Br., based on clonal half-sib progenies
Provedor de dados: 63
Autores: Bottignon,Marcos Ribeiro; Rufino,Elcio Rodrigo; Marques,Márcia Ortiz Mayo; Colombo,Carlos Augusto; Azevedo Filho,Joaquim Adelino de; Lourenção,André Luiz; Martins,Antônio Lúcio Mello; Siqueira,Walter José.
Lippia alba (Mill.) N.E.Br. is an aromatic and medicinal shrub native to the American continent. Despite its potential as a source of essential oil for the pharmaceutical and cosmetics industries, few selection and genetic improvement studies have been carried out. The aim of this study was to provide genetic information on this species for breeding programs, showing its selection potential, by investigating clonal half-sib progenies. The following characteristics were evaluated per plant: leaf dry mass (LDM), total dry mass (TDM), leaf yield (LY), essential oil yield (EOY) and oil production (OP). Estimates were made for the several genetic parameters including absolute genetic gain at 30% selection intensity, correlations and relative contribution of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Genetic gain; Breeding; Essential oils.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000400009

Avaliação nutricional do leite de búfala em comparação ao leite de vaca
Provedor de dados: 63
Autores: Verruma,M.R.; Salgado,J.M.
Foi estudado o valor nutricional do leite de búfala integral e diluído em comparação com o leite de vaca integral e tipo C, utilizando ratos como animais de teste, obtendo-se as seguintes conclusões: não houve diferença entre os leites estudados quanto à digestibilidade in vitro; a retenção de cálcio pelos animais, foi superior para a dieta com leite de búfala integral; não houve diferenças significativas para os níveis de triglicerídeos no sangue dos animais; os níveis de colesterol no sangue dos animais foram maiores para as dietas contendo leite de búfala, embora esses níveis sejam considerados dentro da faixa normal para os animais em estudo.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Leite de búfala; Leite de vaca; Avaliação nutricional; Ca; Biodisponibilidade; Colesterol; Triglicerídeos.
Ano: 1993
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161993000300017

Reproductive biology in species of Bidens L. (Asteraceae)
Provedor de dados: 63
Autores: Grombone-Guaratini,Maria Tereza; Solferini,Vera Nisaka; Semir,João.
Studies about reproductive biology of weed species can have implications on the establishment of controlling practices that minimize the effects of these weed populations on agricultural fields. The pollination biology of Bidens alba (L.) DC., B. pilosa L., and Bidens subalternans DC., was studied at different sites and climatic seasons. Bidens pilosa and B. subalternans are widely distributed in agricultural areas, in disturbed habitats, and along road sides. Bidens alba occur only along the coast. The three species are self-compatible and non agamospermous. The composition of the pollinator community changes during the year and between sites. Hymenopterans and lepidopterans are the most frequent visitors to Bidens species in both areas studied. Although...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Floral visitors; Pollination biology; Weed species.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000200010

Quarenta e oito anos de melhoramento da videira em São Paulo, Brasil
Provedor de dados: 63
Autores: Ferri,C.P.; Pommer,C.V.
A cultura de uvas de mesa em São Paulo vem aumentando de importância, o que é flagrante pelos incrementos na área plantada verificados nos últimos anos. A demanda por tecnologia tem acompanhado esse crescimento, especialmente no que se refere a novas variedades que atendam tanto ao mercado externo, quanto ao interno, com uvas de alta qualidade. No programa de melhoramento para uvas de mesa no Instituto Agronômico, iniciado em 1943, praticamente nenhum estudo foi efetuado sobre os progenitores utilizados nos cruzamentos. Neste trabalho foram avaliados centenas de cruzamentos e as variedades envolvidas, bem como suas progênies e seu interrelacionamento genealógico. De acordo com os dados analisados e os parâmetros utilizados, foram considerados preferenciais...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Videira; Melhoramento da videira; Progenitores; Seleção.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000100019

Impact of sugarcane trash on fertilizer requirements for São Paulo, Brazil
Provedor de dados: 63
Autores: Trivelin,Paulo Cesar Ocheuze; Franco,Henrique Coutinho Junqueira; Otto,Rafael; Ferreira,Danilo A.; Vitti,André Cesar; Fortes,Caio; Faroni,Carlos E.; Oliveira,Emidio C. A.; Cantarella,Heitor.
The area under mechanized sugarcane (Saccharum spp.) harvesting is expanding in Brazil, increasing the return of trash to the soil. The main questions regarding this management are: (i) after adopting unburned mechanical harvesting, how long will it take to observe decreases in fertilizer requirements, (ii) what will be the magnitude of this decrease and, (iii) the impact in the short run of removing trash for energy purposes in the nutrient cycling? This study aimed to build an N prediction model for long term assessment of the contribution of sugarcane crop residues to sugarcane nutrition and to evaluate the cycling of other nutrients derived from crop residues. Keeping crop residues over the soil will increase soil N stock and N recovery by sugarcane,...
Tipo: Info:eu-repo/semantics/article
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162013000500009

Acid phosphatase activity and leaf phosphorus content in soybean cultivars
Provedor de dados: 63
Autores: Raposo,Roberto Wagner Cavalcanti; Muraoka,Takashi; Basso,Luiz Carlos; Lavres Jr.,José; Franzini,Vinicius Ide.
The phosphate fertilization represents the most costly fraction of soybean crop production. Efficient soybean cultivars for P absorption and utilization in soils of medium available P are highly desirable and might contribute for increasing crop production potential. Thirty two soybean [Glycine max (L.) Merr.] cultivars recommended for 'Cerrado' and differing in growth cycle (early, semi-early, semi-late, and late) were grown in a dystrophic Typic Haplustox Cerrado soil to evaluate the acid phosphatase activity, P content in the diagnostic leaf, and shoot biomass. There were differences among the soybean cultivars within all maturation groups in acid phosphatase activity and shoot biomass. The diagnostic-leaf P-content showed significant differences on...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Enzymatic activity; Diagnostic-leaf; Maturation group.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000400014

Simulating the vernalization response of the "Snow Queen" lily (Lilium longiflorum Thunb.)
Provedor de dados: 63
Autores: Streck,Nereu Augusto; Schuh,Mariângela.
Vernalization is a process required by certain plant species, including lilies (Lilium spp.), to enter the reproductive phase, through an exposure to low, non-freezing temperatures. The objective of this study was to evaluate a nonlinear vernalization response function for the "Snow Queen" lily. An experiment was carried out in Santa Maria, RS, Brazil, to provide an independent data set to evaluate the performance of the model. Lily bulbs were vernalized at -0.5, 4.0, and 10ºC during two, four, six, and eight weeks. The daily vernalization rate (fvn) for each treatment was calculated with a beta function, and the effective vernalization days (VD) were calculated by accumulating fvn. The thermal time from plant emergence to visible buds at different VD...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Low temperature; Flowering; Bulb; Model; Plant development.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000200004

Quality of sausage elaborated using minced Nile Tilapia submmitted to cold storage
Provedor de dados: 63
Autores: Oliveira Filho,Paulo Roberto Campagnoli de; Fávaro-Trindade,Carmen Sílvia; Trindade,Marco Antônio; Balieiro,Júlio Cesar de Carvalho; Viegas,Elisabete Maria Macedo.
Filleting yield of Nile tilapia Oreochromis niloticus (L.) is low (30%) and generates large amount of wastes that may turn into environmental and economic problem. However, these wastes can be used for the extraction of minced fish (MF) which can be used in the preparation of sausages. The objective of this study was to assess the quality of sausages prepared with 0, 20, 40, 60, 80 and 100% of MF from Nile tilapia filleting waste during storage at 0±0.3ºC. Alterations in the instrumental color (L*, a* and b*), lipid oxidation (TBARS), total volatile nitrogenous bases (TVB-N), pH, microbiological condition (pathogenic bacteria and aerobic psychrotrophic bacteria), and sensory attributes (color, odor, flavor, texture and overall acceptability) were evaluated...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fish sausage; Lipid oxidation; Filleting waste; Shelf-life; Sensory acceptability.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000200009

In vitro conservation of diploid banana accessions
Provedor de dados: 63
Autores: Oliveira,Roberto Pedroso de; Silva,Sebastião de Oliveira e; Silva,Keuder Magalhães da; Silveira,Daniela Garcia.
A protocol for the in vitro conservation of diploid banana accessions based on lower temperature for culture environment was developed. Twenty four genotypes, four clones per genotype were studied. After disinfection, shoot tips (0.5 cm diameter x 0.5 cm height) were established in vitro and submitted to multiplication induced by benzylaminopurine. Twelve explants (0.6 cm diameter x 1.2 cm height) from each accession were transferred to the MS medium supplemented with 20 g L-1 sucrose and 2 g L-1 Phytagel, without growth regulators, under light intensity of 2000 lux, 16-hour photoperiod, at temperatures of: 17 ± 2ºC, 22 ± 2ºC and 26 ± 2ºC. The development of plantlets was evaluated during 450 days and the survived plantlets were acclimated under greenhouse...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Musa spp.; Germplasm; In vitro conservation.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000200008

EFEITO DO ÁCIDO GIBERÉLICO SOBRE O COMPRIMENTO E DIÂMETRO DO CAULE DE PLÂNTULAS DE LIMÃO `CRAVO' (Citrus limonia Osbeck)
Provedor de dados: 63
Autores: MODESTO,J.C.; RODRIGUES,J.D.; PINHO,S.Z. de.
O presente trabalho foi instalado em condições de campo com plântulas de limão `Cravo'(Citrus limonia Osbeck), em delineamento inteiramente casualizado, com três repetições no esquema de parcelas sub-divididas, onde os tratamentos principais foram 5 concentrações de ácido giberélico: T1 = 0, T2 = 25, T3 = 50, T4 = 100 e T5 = 150 ppm, parceladas em quatro pulverizações. Os tratamentos secundários foram as coletas do material, realizadas dos 70 aos 210 dias, em intervalos de 14 dias. Pelos resultados obtidos, o fitorregulador promoveu efeito favorável com relação ao incremento do comprimento do caule, sendo o tratamento de 150 ppm superior aos demais. O diâmetro do caule atingiu maiores dimensões com aplicação de ácido giberélico 50 e 25 ppm.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Porta-enxerto; Limão `Cravo'; Citrus limonia Osbeck; Ácido giberélico; Crescimento.
Ano: 1996
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161996000200023

Relação energia: proteína na nutrição do tucunaré
Provedor de dados: 63
Autores: Sampaio,Ana Maria Barreto de Menezes; Kubitza,Fernando; Cyrino,José Eurico Possebon.
O objetivo deste estudo foi avaliar o efeito da relação energia:proteína no desempenho e composição corporal do tucunaré. Para tanto, 196 alevinos de tucunarés (Cichla sp.), condicionados a aceitar alimentos secos, com peso médio vivo de 10 g, foram estocados em gaiolas de tela de volume igual a 25 L, alojadas em 16 caixas de cimento amianto com volume de 500 L, instaladas em uma estufa e abastecidas por um sistema fechado de recirculação de água. Os peixes foram alimentados ad libitum com ração seca em duas refeições diárias, por um período de 65 dias com quatro rações isoenergéticas (3.500 kcal de ED kg-1 de ração), com níveis de proteína bruta de 41%, 37%, 33% e 30% de forma a obter uma relação ED:PB de 8, 9, 10 e 11 kcal de ED g-1 de PB,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cichla sp.; Taxa de eficiência; Proteína; Valor produtivo; Energia bruta.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000200004

Agrometeorological models for 'Valencia' and 'Hamlin' sweet oranges to estimate the number of fruits per plant
Provedor de dados: 63
Autores: Paulino,Silvia Elisandra Pasqua; Mourão Filho,Francisco de Assis Alves; Maia,Aline de Holanda Nunes; Avilés,Tatiana Eugenia Cantuarias; Dourado Neto,Durval.
The development of models that allow forecasting yield tendencies is important to all sectors of the citrus industry. This work evaluated the influence of meteorological variables in different phases of the crop cycle in order to propose empirical models to estimate the number of fruits per plant (NFP) of 'Valencia' and 'Hamlin' sweet oranges. NFP sampling data from the citrus juice industry of the State of São Paulo, on the total of 15 harvests (1990/91 to 2004/05), classified into three age classes, and meteorological data of maximum and minimum air temperature and rainfall of Limeira, SP, Brazil, were utilized. Correlation coefficients were initially computed between the number of fruits per plant and each meteorological variable used for water balance...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Citrus; Harvest; Modeling; Yield.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000100001

Liming and fertilization to restore degraded Brachiaria decumbens pastures grown on an entisol
Provedor de dados: 63
Autores: Oliveira,Patrícia Perondi Anchão; Boaretto,Antonio Enedi; Trivelin,Paulo Cesar Ocheuze; Oliveira,Wladecir Salles de; Corsi,Moacyr.
The reconstitution of soil fertility is essential in the process of pasture restoring, liming being the first action to be taken in this direction. The liming recommendation for pastures needs more technical information as the application method and rate. A field experiment was carried out to evaluate the liming and fertilization practices to restore a degraded Brachiaria decumbens pasture. The following factors were studied: liming method (incorporated in soil by disking or not); level of base saturation (40, 50 or 80%) and lime type (55, 70 or 90 of ECC). Liming and fertilization (NPK and micronutrients) increased both the forage yield and its root system, these being more evident in the second year, even using the same rates of lime and fertilizer used...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: ECC; Lime; Restoration; Base saturation; Acid soils.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000100019

Regressão segmentada como modelo na determinação de exigências nutricionais de peixes
Provedor de dados: 63
Autores: Portz,Leandro; Dias,Carlos Tadeu dos Santos; Cyrino,José Eurico Possebon.
A produção de peixes como atividade agroindustrial vem crescendo consideravelmente, motivando o crescimento das indústrias especializadas em produção de rações para peixes e crustáceos e criando grande demanda por conhecimentos específicos sobre as exigências nutricionais das várias espécies de peixes e crustáceos utilizados em aquicultura comercial. As exigências nutricionais dos organismos aquáticos podem ser influenciadas por vários fatores, incluindo tamanho do peixe, composição e forma da dieta, manejo alimentar, sistema e regime de produção. Além disso os tipos de modelos estatísticos e matemáticos utilizados na determinação destas exigências podem ou não ser adequados à estimativa dos parâmetros biológicos avaliados. O presente trabalho apresenta...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: "broken-line"; Exigência nutricional; Peixe.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000400002

Quantitative trait locus mapping associated with earliness and fruit weight in tomato
Provedor de dados: 63
Autores: Hernández-Bautista,Aurelio; Lobato-Ortiz,Ricardo; García-Zavala,José Jesús; López-Fortoso,Fernando; Cruz-Izquierdo,Serafín; Chávez-Servia,José Luis; Cadeza-Espinosa,Marisol.
ABSTRACT The flowering time is regarded as an important factor that affects yield in various crops. In order to understand how the molecular basis controlling main components of earliness in tomato (Solanum lycopersicum L.), and to deduce whether the correlation between fruit weight, days to flowering and seed weight, is caused by pleiotropic effects or genetic linkage, a QTLs analysis was carried out using an F2 interspecific population derived from the cross of S. lycopersicum and S. pimpinellifolium. The analysis revealed that most of the components related to earliness were independent due to the absence of phenotypic correlation and lack of co-localization of their QTLs. QTLs affecting the flowering time showed considerable variation over time in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Solanum lycopersicum; QTLs; Epistasis; Days to flowering; Path analysis.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000500478

Utilization and fate of phosphorus of different sources applied to cohesive soil of Amazonian periphery
Provedor de dados: 63
Autores: Coelho,Marta Jordana Arruda; Aguiar,Alana das Chagas Ferreira; Sena,Virley Gardeny Lima; Moura,Emanoel Gomes de.
ABSTRACT In the Amazonian region, P is often a primary factor limiting sustainable agrosystems. We compared the efficiencies of local aluminous phosphate (ALP) and single superphosphate (SSP) under a cover of leguminous residues to determine the fate of P sources in an Amazonian soil with hardsetting characteristics. The experiment followed a randomized block design with four replications and the following treatments: ALPU, i.e. ALP plus urea (U); ALPL, i.e., ALP plus leucaena (L); SSPU, i.e., SSP plus urea; SSPL, i.e., SSP plus leucaena; and BS, i.e., bare soil (without residues). To assess the residual values of the P sources, we used a sequence of crops consisting of maize, cowpea and cassava. Both ALP and SSP exhibited low P efficiency in BS. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: P fractions; Hardsetting soil; Aluminous phosphate; Leguminous residues; Nitrogen.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162017000300242

Norms for the diagnosis and recommendation integrated system for Signal grass
Provedor de dados: 63
Autores: Silveira,Cristiane Prezotto; Nachtigall,Gilmar Ribeiro; Monteiro,Francisco Antonio.
The Diagnosis and Recommendation Integrated System (DRIS) has been proved efficient as a method for nutritional diagnosis in several crops. However there is a lack of information on the use of DRIS for tropical forage grass. The aim of this paper was to establish norms for interpretation of results of analysis from recently expanded leaf laminae of Brachiaria decumbens Stapf. (Signal grass), through the DRIS method. To establish DRIS norms, concentrations of N, P, K, Ca, Mg, S, Cu, Fe, Mn, and Zn and the relative production obtained in six experiments conducted in greenhouse using nutrient solution and silica as substrate were considered. DRIS indices were calculated using two criteria in order to choose the ratio order of nutrients: F value - ratio of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brachiaria decumbens; DRIS norms; Foliar diagnosis.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000600001

Establishment of seed quality control programs
Provedor de dados: 63
Autores: Cicero,S. M.
An efficient quality control program should lead to the production of high quality seeds. Consequently, a series of technical and administrative procedures must be adopted in a way that does not compromise this objective. Considering that, in applied terms, external control becomes less important as internal control programs advance technologically, this work emphasizes the principle factors that should be considered in the implantation of a seed quality control program, such as: work groups, physical structure and procedures to initiate the program.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Work groups; Physical structure; Procedures to initiate the program.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000500006

Efeito do estiolamento parcial e do ácido indolbutírico (IBA) no enraizamento de estacas de ramos de goiabeira serrana (Feijoa sellowiana, Berg)
Provedor de dados: 63
Autores: Figueiredo,S.L.B.; Kersten,E.; Schuch,M.W.
Com o objetivo de verificar o efeito do estiolamento parcial dos ramos e do ácido indolbutírico (IBA), no enraizamento de estacas de Feijoa sellowiana, conduziu-se este trabalho de enraizamento em três épocas de estiolamento, utilizando-se câmara de nebulização. Antes das estacas serem retiradas efetuou-se o estiolamento dos ramos de diversas plantas, com uniformidade de tamanho e idade. Foram utilizadas estacas de ramos em três intervalos de estiolamento (zero, 40 e 60 dias), tratadas com Zero; 5000; 7000; 9000 e 11000 ppm de IBA, na formulação de pó. Foi avaliado o número de estacas enraizadas, determinando-se a percentagem de enraizamento. Os resultados mostraram que estiolamento parcial foi efetivo para o enraizamento, sendo que o melhor intervalo foi...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Estiolamento; Ácido indolbutírico; Estacas; Enraizamento; Feijoa sellowiana.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000100029

A statistical basis for selecting parameters for the evaluation of soil penetration resistance
Provedor de dados: 63
Autores: Leão,Tairone Paiva; Silva,Álvaro Pires da.
Measurements of soil penetration resistance (SR) have been frequently used for the evaluation of soil structural quality for plant growth. However, different data analysis approaches have been used, without a previous evaluation of their statistical quality. In this study we tested the hypothesis that the mean is the parameter with best statistical properties to evaluate alterations in soil penetration resistance in response to soil use and management, as compared to other SR statistical parameters. Undisturbed (5 × 5 cm) soil cores were collected from three sampling sites with different degrees of compaction: an undisturbed site under native scierophylous forest (NC); a site under short-duration grazing with post-grazing residue maintained at 2.0 to 2.5...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: LSD; Probit analysis; Means comparison test; Soil physical quality assessment.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000600007

Escória de siderurgia e calcário na correção da acidez do solo cultivado com cana-de-açúcar em vaso
Provedor de dados: 63
Autores: Prado,Renato de Mello; Fernandes,Francisco Maximino.
A avaliação química da escória de siderurgia, como corretivo de acidez do solo, pode sofrer interferências em razão da presença da alta energia de ligação dos seus constituintes neutralizantes e a presença de diversos elementos metálicos. Tendo como objetivo avaliar se a recomendação de correção baseada no poder de neutralização adotado para o calcário é compatível para escória de siderurgia, em função das alterações do valor pH, teores de H+Al, Ca+Mg em solos ácidos da região dos cerrados cultivados com cana-de-açúcar, realizou-se o presente experimento, em condições de casa de vegetação, em vaso com 20 dm³ do Latossolo Vermelho e do Neossolo Quartzarênico em dois cultivos sucessivos da cana-de-açúcar (cana-planta e cana-soca) por 210 dias após a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Calagem; Silicato; Resíduo siderúrgico; Poder de neutralização; Solo ácido.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000400023

Physiological potential of cauliflower seeds
Provedor de dados: 63
Autores: Kikuti,Ana Lúcia Pereira; Marcos-Filho,Julio.
The assessment of seed physiological performance is essential to provide consistent information to compose quality control programs conducted by seed companies and allow prompt decisions to reduce post-harvest and commercialization problems. This research was carried to evaluate the efficiency of different procedures to determine cauliflower seed vigor. Six lots of the cultivar Sharon were initially characterized by germination and seedling emergence, and subsequently subjected to traditional and saturated salt accelerated aging, controlled deterioration, electrical conductivity, and potassium leachate tests, in two evaluation times. The traditional accelerated aging (41ºC/48 h), the saturated salt procedure (45ºC/72 h), the controlled deterioration...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brassica oleracea L. var. botrytis; Seed analysis; Vigor; Quality control.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000400008

Traditional Eastern Spanish varieties of tomato
Provedor de dados: 63
Autores: Cortés-Olmos,Carles; Valcárcel,José Vicente; Roselló,Josep; Díez,Maria José; Cebolla-Cornejo,Jaime.
Despite the importance of traditional varieties of tomato (Solanum lycopersicum L.) as sources of variation in breeding programs and varieties targeted to high-price quality markets that value their exceptional organoleptic quality, little is known regarding the structure of these materials at the morphological level. In this study, a collection of 166 populations (137 of them during two years) of traditional varieties of tomato from the east coast of Spain has been characterized using 41 descriptors. The characterization revealed a considerable variation. The segregation observed in several populations (28 %) suggests that apart from the configuration as population varieties, the high variation present in these landraces may be partially due to possible...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Solanum lycopersicum; Genetic resources; Breeding; Genebank.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162015000500420

Calibration and validation of models for short-term decomposition and N mineralization of plant residues in the tropics
Provedor de dados: 63
Autores: Nascimento,Alexandre Ferreira do; Mendonça,Eduardo de Sá; Leite,Luiz Fernando Carvalho; Scholberg,Johannes; Neves,Julio Cesar Lima.
Insight of nutrient release patterns associated with the decomposition of plant residues is important for their effective use as a green manure in food production systems. Thus, this study aimed to evaluate the ability of the Century, APSIM and NDICEA simulation models for predicting the decomposition and N mineralization of crop residues in the tropical Atlantic forest biome, Brazil. The simulation models were calibrated based on actual decomposition and N mineralization rates of three types of crop residues with different chemical and biochemical composition. The models were also validated for different pedo-climatic conditions and crop residues conditions. In general, the accuracy of decomposition and N mineralization improved after calibration. Overall...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Modeling; Nutrient cycling; Organic agriculture; Soil organic matter.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162012000600008

Ocorrência de grãos gessados em três cultivares de arroz
Provedor de dados: 63
Autores: Marchezan,E.; Dario,G.J.A.; Torres,S.
Foi avaliada a ocorrência de grãos gessados em grãos de arroz de três genótipos de arroz irrigado, em diferentes ambientes, proporcionados pela realização de semeaduras durante a época recomendada. Os experimentos foram realizados durante o ano agrícola de 1988/89 no campo experimental do Departamento de Agricultura da Escola Superior de Agricultura "Luiz de Queiroz" (ESALQ/USP). Utilizou-se os cultivares IAC-4440, PESAGRO-104 e a linhagem CNA-3771, realizando-se quatro semeaduras, entre 04/10 a 09/12/88, período correspondente à época recomendada para o Estado de São Paulo. A avaliação de grãos gessados foi feita em arroz beneficiado utilizando-se 100 grãos, retirados ao acaso, da amostra de grãos inteiros, que foi colhida com teor de água em torno de...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Orysa sativa L. barriga branca; Centro branco; Grão quebrado; Grão gessado.
Ano: 1992
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161992000400012

Resilience of soil microbial activity and of amino acid dynamics to the removal of plant carbon inputs during winter
Provedor de dados: 63
Autores: Avramides,Elizabeth J.; Christou,Matina; Jones,David L.
Many temperate agricultural soils have prolonged periods in the winter when plant carbon inputs to the soil are low. Soil maintained at low temperature in the absence of plants was used to simulate the conditions in a vineyard soil during winter. In a four month simulated overwintering period we showed that the concentration of dissolved organic carbon and nitrogen in soil solution slowly declined alongside heterotrophic soil respiration. Measurements of free amino acid concentrations and turnover indicated that the amino acid pool in soil was rapidly depleted but readily replenished throughout the four-month period. This indicates that the soil contained intrinsic reserves of labile C that was capable of supporting the soil microbial community in times of...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: DOC; DON; Microbial activity; Mineralization; Nitrate; Storage.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000100019

Recovery of copper (II) absorbed in biomass of Cladosporium cladosporioides
Provedor de dados: 63
Autores: Carmo,Juliana Ribeiro do; Pimenta,Carlos José; Silva,Júlia Ferreira da; Souza,Sara Maria Chaulfoun de.
The biosorption process, characterized by the use of biomass for removing metals from aqueous solutions, is an attractive technology using inactive and dead biomasses to remove heavy metals from aqueous solutions in the absence of metabolic activity necessary for intracellular accumulation. The desorption process, which concentrates the metal previously absorbed for possible reuse, is also important. The desorption of copper (Cu) (II) associated with the biomass of Cladosporium cladosporioides (Fres) de Vries was evaluated following the biosorption process (adsorption). Specifically, four eluents were used (all at a concentration 0.1 mol L-1), sulfuric acid, hydrochloric acid, ethylenediaminetetraacetate disodium and calcium chloride, as well as the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biosorption; Metal; Desorption.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162013000300002

Desempenho da tilápia nilótica Oreochromis niloticus (L.) em gaiolas de pequeno volume
Provedor de dados: 63
Autores: Bozano,Gustavo Luiz Naslausky; Rodrigues,Samer Ramos Monteiro; Caseiro,Alexsandra Carmen; Cyrino,José Eurico Possebon.
Alevinos de tilápia nilótica Oreochromis niloticus (L.) com peso médio de 18,85 g, foram estocados em gaiolas de 1,7 m3 cada, em densidades de 75, 150, 300 e 600 peixes/m3 (T75; T150; T300 e T600), num delineamento inteiramente casualizado (4 tratamentos e 3 repetições), e criados por 196 dias, com ração comercial extrusada, flutuante, contendo 28% de proteína bruta. A cada 30 dias, 20% do lote de peixes de cada gaiola foi medido e pesado para determinar ganho de peso (GDP) e conversão alimentar (CA) de cada tratamento. Os resultados finais de CA e GDP para cada tratamento foram, respectivamente: para T75, 6,31:1 e 71,52g; para T150, 4,08:1 e 65.14g; para T300, 3,57:1 e 59,60g; e para T600, 2,96:1 e 69,17g. Em relação ao ganho de peso, T600 e T75 foram...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Tilápia do Nilo; Tanques-rede; Capacidade de suporte; Desempenho.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000400008

Canonical correlations among chemical, physical and morphological characteristics of Xaraés palisadegrass under rotational grazing
Provedor de dados: 63
Autores: Nave,Renata La Guardia; Pedreira,Carlos Guilherme Silveira; Lima,César Gonçalves de.
In forage evaluation experiments, the assessment of adaptive and productive characteristics of genotypes is generally prioritized over qualitative responses such as nutritive value and voluntary intake. Methods that are capable of characterizing forage quality through the physical resistance to degradation have been proposed, including grinding resistance and shearing resistance. Canonical correlations establish a multivariate approach associating multiple variables depicting inter-relations studies between groups of dependent and independent variables. The objective of this research was to assess the degree of association among groups of quality-related responses of grazed Xaraés palisadegrass forage using canonical correlations among morphological,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Warner-Bratzler; Digestibility; Forage quality; Nutritive value.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000200018

Efeito de épocas de deficiência hídrica na evapotranspiração atual da cultura do feijão cv. imbabello
Provedor de dados: 63
Autores: CALVACHE,A.M.; REICHARDT,K.; BACCHI,O.O.S.
O presente trabalho teve por objetivo identificar os estádios da cultura de feijão que apresentam a menor sensibilidade ao estresse de água no solo, nos quais a irrigação pode ser omitida sem um significativo decréscimo na evapotranspiração, para melhor definir práticas de irrigação em situação de água escassa. O experimento foi realizado em um solo franco arenoso (Typic Haplustoll), em Tumbaco-Pichincha, Equador, entre julho e novembro de 1994, região caracterizada por um clima temperado e seco (temperatura média anual de 16ºC, umidade relativa média do ar 74% e chuva de 123 mm durante o peláodo do experimento). Sete regimes de irrigação foram utilizados, incluindo irrigação ótima durante todo o ciclo, irrigação deficiente durante todo o ciclo, irrigação...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Eficiência de uso de água; Feijoeiro; Phaseolus vulgaris; Balanço hídtico; Sonda de neutrons.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000300018

Ruminal silage degradability and productivity of forage and grain-type sorghum cultivars
Provedor de dados: 63
Autores: Resende,José Antônio; Pereira,Marcos Neves; Pinho,Renzo Garcia Von; Fonseca,Abeilard Henrique; Silva,Aloísio Ricardo Pereira da.
Forages for feeding dairy cows should conciliate the potential for high dry matter yield per unit area, maximizing animal stocking rate, with high nutritive value, which enables decreasing the amount of concentrate feedstuffs per milk unit produced. Eighteen sorghum cultivars were cultivated 0.70 m apart and with 12 plants per linear meter. Plants harvested at the milk-to-dough stage were ensiled in the laboratory. Eleven agronomic and chemical traits were evaluated. Silage samples were incubated in situ and the effective ruminal dry matter degradation (DEF) was calculated assuming a fractional passage rate of -0.04 h-1. Dry matter yield was 13.0 ± 2.3 (mean ± S.D.) t ha-1. The neutral detergent fiber content was 50.3 ± 3.8 and the DEF was 48.8 ± 2.8% (dry...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Digestibility; Fiber; Rumen; In situ; Corn silage.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000300007

Reaction of sources of resistance to white mold to microsatellite haplotypes of Sclerotinia sclerotiorum
Provedor de dados: 63
Autores: Lehner,Miller da Silva; Paula Júnior,Trazilbo José de; Vieira,Rogério Faria; Lima,Renan Cardoso; Soares,Bruno de Almeida; Silva,Rhaphael Alves.
ABSTRACT White mold caused by the fungus Sclerotinia sclerotiorum is the most yield-limiting disease of common bean in Brazil. To date, there has been no commercial cultivar resistant to this disease. In a greenhouse we evaluated white mold resistance sources (Cornell 605, A195 and G122) against eight isolates of S. sclerotiorum from five Brazilian states. A Brazilian cultivar (BRSMG Madrepérola) and a susceptible check (Beryl) were used as control. Treatments were arranged in factorial combinations (5 × 8) in a completely random design with four replicates. Disease severity was assessed on a rating scale of 1-to-9 together with lesion length, which was used to determine an area under the disease progress curve (AUDPC). Polymorphisms detected in ten...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phaseolus vulgaris; Common bean; Crop breeding; Variability.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000200184

Vigor de sementes e análise de crescimento de aveia preta
Provedor de dados: 63
Autores: Schuch,Luis Osmar Braga; Nedel,Jorge Luiz; Assis,Francisco Neto de; Maia,Manoel de Souza.
Este estudo foi conduzido no município de Capão do Leão, RS, Brasil, com o objetivo de avaliar o efeito do vigor das sementes sobre a evolução do crescimento de duas cultivares de aveia preta (Avena strigosa Schreb), bem como verificar possíveis interações com a população de plantas (150, 300 e 450 pl m-2). Diferenças no vigor das sementes e na população de plantas provocaram variação na produção de matéria seca durante o período vegetativo da cultura. Os efeitos reduziram-se progressivamente com o avanço na estação de crescimento, não mais se manifestando por ocasião da antese. Os níveis extremos de vigor de sementes e de população de plantas produziram diferenças de 410 kg ha-1 e 480 kg ha-1 de matéria seca, respectivamente, aos 75 dias após a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Avena strigosa; Rendimento biológico; Área foliar; Taxa de crescimento.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000200018

Enzymatic antioxidant responses to biostimulants in maize and soybean subjected to drought
Provedor de dados: 63
Autores: Vasconcelos,Ana Carolina Feitosa de; Zhang,Xunzhong; Ervin,Erik H.; Kiehl,Jorge de Castro.
Water stress is one of the most important environmental factors inducing physiological changes in plants, such as decrease in the water potential of the cells, the stomatal closure; and the development of oxidative processes mediated by reactive oxygen species (ROS). Antioxidant enzymes superoxide dismutase (SOD), catalase (CAT), and ascorbate peroxidase (APX) are efficient scavengers of ROS. The aim of this research was to examine how the application of biostimulant based on humic substances and aminoacids may affect activity levels of SOD, CAT, and APX of maize and soybean plants under well-watered or drought stress conditions. Pots (4.5 L) were filled with a Typic Hapludult soil where the biostimulants doses were applied. It was taken leaf samples in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Superoxide dismutase; Catalase; Ascorbate peroxidase; Water status.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000300015

Greenhouse irrigation water depths in relation to rose stem and bud qualities
Provedor de dados: 63
Autores: Folegatti,Marcos Vinícius; Casarini,Edivaldo; Blanco,Flávio Favaro.
The cultivation of roses occupies a special place in the flower production of Brazil, the concern with the quality of the buds being intimately related with the appropriate supply of water and nutrients to the plant. With the objective of evaluating stem and bud quality the rose variety 'Osiana' was cultivated in a greenhouse using different irrigation water depths based on fractions of pan evaporation (0.25, 0.50, 0.75, 1.00 and 1.25). The experimental design consisted of total randomized blocks with five replications and five treatments. There is a linear tendency of increasing the length and diameter of the stems and the length and diameter of the buds with increasing irrigation water depths.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Irrigation; Evaporation; Rose.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000300004

Comparison between THE oven and THE Karl Fischer methodS for THE determination of the moisture content of maize (Zea mays L.) and soya (Glycine max (L) Merrill) seeds
Provedor de dados: 63
Autores: TILLMANN,M.A.A; CICERO,S.M.
The objective of the present paper was to compare the seed water content of maize and soya, obtained by the oven method at different temperatures and the Karl Fischer method. The water contents used were 11.2 %, 12.8 % and 16.2 % for maize and 10.7 %, 12.4 % and 16.0 % for soya. Samples were dried for a sufficiently long time in order to obtain the same results in both methods. The results indicate that the official method for seed moisture determination (105oC oven method) should be revised in order to obtain more reliable results. The drying time in the oven varied according to the seed water content and the temperature used.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Seed; Moisture content; Karl Fisher.
Ano: 1996
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161996000100009

Posição da gema axilar e a indução de mutação em mudas de crisântemo (Dendranthema grandiflora Tzvelev)
Provedor de dados: 63
Autores: Adames,Alvis Hernán; Latado,Rodrigo Rocha; Camargo,Nalza Maria; Tulmann Neto,Augusto.
O tratamento mutagênico de meristemas multicelulares em plantas de propagação vegetativa geralmente resulta na formação de plantas quiméricas. Os setores mutados podem ser ampliados e estabilizados por meio de podas repetidas. Este trabalho teve como objetivo estudar a influência de podas em distintas posições (da 1a até a 6a gema axilar) de um ramo M1V1, na freqüência de obtenção de mutantes de coloração de inflorescência e no tamanho dos setores mutados, em plantas de crisântemo irradiadas com raios-gama. Para tal, mudas enraizadas do cultivar ‘Ingrid’ (de coloração rosa escuro) foram tratadas com 20 Gy de raios-gama. Após 40 dias do plantio foram realizadas as podas. Avaliaram-se a freqüência de mutantes e o espectro de mutação para a coloração da...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dendranthema grandiflora; Mutação; Raios-gama; Gema axilar; Quimera; Poda.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000400022

Variações da temperatura da água de um pequeno lago artificial ao longo de um ano em Piracicaba - SP
Provedor de dados: 63
Autores: Angelocci,L. R.; Nova,N. A. Villa.
Foram estudadas as variações térmicas da água em quatro profundidades (0,10; 0,30; 0,60 e 1,20 m) em um pequeno lago artificial situado no munícipio de Piracicaba-SP, entre agosto de 1987 e agosto de 1988, como subsídio à aquacultura e manejo de anfíbios em cativeiro. Independente das amplitudes térmicas do ar serem ou não elevadas, ao longo de um dia as flutuações térmicas na água foram pequenas, sendo que no período diurno foram maiores nas duas menores profundidades, principalmente entre agosto e janeiro. Em dias de alta irradiância solar a temperatura da água mostrou-se superior à do ar na maior parte do dia e em dias chuvosos ou muito nublados isso ocorreu no dia inteiro. Em conseqüência, as temperaturas médias diárias da água em todas as...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Temperatura da água; Lago.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000300005

RESÍDUOS DE FENITROTION EM FRUTOS E FOLHAS DE  TOMATEIRO (Lycopersicon esculentum Mill) ESTAQUEADO
Provedor de dados: 63
Autores: PIZANO,M.A.; DE BAPTISTA,G.C.
Estudou-se o comportamento dos resíduos de fenitrotion em frutos e folhas de tomateiro estaqueado, através de cromatografia gasosa. O experimento de campo foi instalado quando as plantas tinham 90 dias após o transplante das mudas, e constou de quatro tratamentos: (1) uma aplicação de fenitrotion em dosagem simples, de 100 g i.a./100 litros de água, (2) uma aplicação em dosagem dobrada, de 200 g i.a./100 litros de água, (3) quatro aplicações espaçadas de sete dias, na dosagem simples e (4) testemunha. As amostras de fruto e folha foram colhidas um dia antes da aplicação (-1) e aos zero , 1, 2, 3, 5, 7 e 14 dias após. Basicamente, a metododogia para análises dos resíduos dos frutos e das folhas constou da extração com acetona e partição em clorofórmio;...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Resíduos; Tomate; Fenitrotion; Fruto; Folha.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000200006

Produção e perfilhamento de Brachiaria decumbens Stapf. em função de doses de enxofre
Provedor de dados: 63
Autores: Santos,Anacleto Ranulfo dos; Monteiro,Francisco Antonio.
O experimento foi realizado em casa-de-vegetação em Piracicaba, São Paulo, no período de outubro a dezembro de 1996, com Brachiaria decumbens Stapf. cv. Basilisk cultivada em solução nutritiva e utilizando sílica como substrato. Foi empregado o delineamento de blocos completos ao acaso, com quatro repetições. O primeiro corte das plantas foi efetuado 40 dias após transplante para os vasos, e o segundo corte 30 dias após o primeiro. Foram avaliadas oito doses de enxofre (0; 2; 4; 16; 32; 48; 64 e 80 mg L-1) na produção de matéria seca e no número de perfilhos. As doses de enxofre proporcionaram aumentos na produção de matéria seca da parte aérea e das raízes do capim-braquiária e influenciaram o número de perfilhos no segundo crescimento dessa forrageira.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Capim-braquiária; Enxofre; Solução nutritiva.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000300025

Utilização de nutrientes por células de algodoeiro cultivadas em suspensão
Provedor de dados: 63
Autores: Celedón,Paola Alejandra Fiorani; Kobayashi,Adilson Kenji; Vieira,Luiz Gonzaga Esteves.
Com o objetivo de conhecer os requerimentos nutricionais de suspensões celulares de algodoeiro foi feita uma análise da utilização de nutrientes no intervalo de 30 dias, normalmente utilizado entre subculturas. As culturas de células em suspensão de algodoeiro, genótipo 101-102B, foram estabelecidas e subcultivadas mensalmente em meio líquido. Foram analisadas o crescimento das culturas, as variações de pH do meio de cultura e a absorção de nutrientes. A matéria fresca das culturas de células foi superior a 6 vezes o valor inicial após 30 dias de cultivo. Houve aumento do pH no início da cultura, estabilizando-se em 6,2 próximo à fase estacionária. Durante o crescimento das suspensões, as células consumiram pelo menos 80% da concentração inicial da maioria...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gossypium hirsutum; Cultura de tecido; Macronutriente; Micronutriente.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000300010

Determinação de metodologia para oisolamento de protoplastos de tangerina Cleópatra (Citrus reshni Hort.)
Provedor de dados: 63
Autores: Oliveira,R.P. de; Mendes,B.M.J.; Tulmann Neto,A.
A hibridação somática via fusão de protoplastos vem sendo utilizada no melhoramento de porta-enxertos de citros em diversos países. Nos Estados Unidos, vários estudos demonstram a eficiência de procedimentos no isolamento e cultivo de protoplastos dessa frutífera. O presente trabalho foi realizado com o objetivo de avaliar o efeito do meio de cultivo de calos embriogênicos do porta-enxerto tangerina Cleópatra (Citrus reshni Hort.) sobre o isolamento de protoplastos, bem como sugerir alterações de procedimento. Os resultados mostram a possibilidade do isolamento de 1.4 x 10(6) a 4.7 x 10(6) protoplastos por grama de calos da espécie estudada. Verificou-se que, o subcultivo dos calos de tangerina Cleópatra em meio de cultura, sem reguladores 1 hora, sob...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Tangerina Cleópatra; Protoplastos; Isolamento.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000100007

Multiperspective analysis of erosion tolerance
Provedor de dados: 63
Autores: Sparovek,Gerd; De Maria,Isabella Clerici.
Erosion tolerance is the most multidisciplinary field of soil erosion research. Scientists have shown lack in ability to adequately analyze the huge list of variables that influence soil loss tolerance definitions. For these the perspectives of erosion made by farmers, environmentalists, society and politicians have to be considered simultaneously. Partial and biased definitions of erosion tolerance may explain not only the polemic nature of the currently suggested values but also, in part, the nonadoption of the desired levels of erosion control. To move towards a solution, considerable changes would have to occur on how this topic is investigated, especially among scientists, who would have to change methods and strategies and extend the perspective of...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Soil erosion; Soil degradation; Land use planning.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000200029

Brachiaria decumbens supresses the initial growth of Coffea arabica
Provedor de dados: 63
Autores: Dias,Guilherme Faus da Silva; Alves,Pedro Luís da Costa Aguiar; Dias,Tomás Carneiro de Souza.
Brachiaria decumbens is becoming one the most common weeds growing in young coffee orchards because, besides its fast growth and difficulty of control, new coffee orchards are usually established in pasture areas. In order to verify the effect of B. decumbens plant density on the early growth of coffee (Coffea arabica L. cv. Catuaí Amarelo), a competition experiment was conducted under semi-controlled humidity conditions. Soil collected in a Typic Haplustox was placed in 70 L asbestos cement boxes and one coffee seedling was planted in each box. The B. decumbens seedlings were transplanted to the boxes at the 2-4 leaf stage. Treatments consisted of 0, 4, 8, 12, 16, 20, 24, 36, 48, and 60 weeds m-2. The experimental period started 120 days after...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Weed; Coffee; Competition; Growth suppression.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000600003

Spatial variability of soil hydraulic properties on a steep slope in the loess plateau of China
Provedor de dados: 63
Autores: Hu,Wei; Shao,Ming An; Wang,Quan Jiu; Fan,Jun; Reichardt,Klaus.
The understanding of the structure of the spatial variability of soil surface hydraulic properties on steep slopes is important for modeling infiltration and runoff processes. The objective of this study was to investigate the spatial variability of these properties on a steep slope of the Loess Plateau in northwest China. A 9600 m² area was systematically sampled in a grid of 106 points spaced 10 m x 10 m. Hydraulic properties were determined with a disc infiltrometer under multiple pressure heads (-15, -9, -6, -3, 0 cm) at each sample point. Classical and geo-statistical methods were used for data analysis. The results indicated that the variation of Gardner's a and hydraulic conductivities at all applied pressure heads was moderate and the heterogeneity...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Disc infiltrometer; Steep sloping land; Pressure head; Spatial structure.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000300007

Marandu palisadegrass growth under nitrogen and sulphur for replacing signal grass in degraded tropical pasture
Provedor de dados: 63
Autores: Bona,Fabiano Daniel De; Monteiro,Francisco Antonio.
The degradation of Brachiaria decumbens Stapf. (Signal grass) pastures has resulted in a big problem for the Brazilian cattlemen. The objective of this study was to assess fertilization with nitrogen (N) and sulphur (S) rates on yield of Brachiaria brizantha (Hochst. ex A. Rich.) Stapf. cv. Marandu (Marandu palisadegrass) under establishment in a soil supporting degrading pasture of Brachiaria decumbens Stapf. Additionally, the N and S concentrations in plant tissue and soil according to the rates of these nutrients were evaluated. The study was carried out in a greenhouse in pots filled with an Entisol with high organic matter content. Five rates of N (0; 100; 200; 300 and 400 mg dm-3) and five rates of S (0; 10; 20; 30 and 40 mg dm-3) were tested in a 5²...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brachiaria brizantha (Hochst. ex A. Rich.) Stapf.; Fertilizer; Production; N:S ratio.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000500011

Chemical characterization of Brazilian hulless barley varieties, flour fractionation, and protein concentration
Provedor de dados: 63
Autores: Helm,Cristiane Vieira; Francisco,Alicia de.
Even though hulless barley is widely known due to its nutritional potential, in Brazil it is only grown at a few agricultural experimental stations. There is no published data about the chemical composition of Brazilian hulless barley varieties; however, research laboratories have studied their agronomical characteristics. The objectives of this study were to present the chemical characterization and effect of flour fractionation on protein concentration of six Brazilian hulless barley varieties, namely IAC IBON 214/82, IAC 8612/421, IAC 8501/31, IAC 8501/12, IAPAR 39-Acumaí, and IAC 8501/22. The analyses included: ash, ether extract, total protein, starch, total insoluble and soluble dietary fiber, and beta-glucans. Flour fractionation was carried out by...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cereals; Naked barley; Protein fractionation; Sieving; Chemical composition.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000600005

Absorção de água e potencial fisiológico em sementes de soja de diferentes tamanhos
Provedor de dados: 63
Autores: Beckert,Osmar Paulo; Miguel,Marcelo Hissnauer; Marcos Filho,Júlio.
A absorção de água por sementes de soja, em função do tamanho, ocorre em diferentes intensidades podendo ter relação com seu potencial fisiológico. A marcha de absorção de água em sementes de soja e sua relação com o potencial fisiológico foram avaliados no presente trabalho. Sementes do cultivar BRS-155 foram classificadas, com base na espessura, em peneiras de crivos oblongos (6,75; 6,35; 5,95; 5,55; 5,15; 4,75 e 4,35 x 19 mm). As retidas nas peneiras 6,35; 5,55 e 4,75 x 19 mm foram submetidas à hidratação controlada (pré-condicionamento) com posterior secagem até atingirem o grau de umidade inicial. A evolução da hidratação foi avaliada por meio da pesagem das sementes de três em três horas, em oito períodos e 5 repetições, e, o potencial fisiológico,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycine max; Embebição; Germinação; Vigor.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000400012

POLPA DE CITROS E DE MILHO E A PRODUÇÃO DE ÁCIDOS GRAXOS VOLÁTEIS NO RÚMEN
Provedor de dados: 63
Autores: Rocha Filho,Ruben Ramos; Machado,Paulo Fernando; D'Arce,Raul Dantas; Francisco Jr.,Jóse Carlos.
Com o objetivo de avaliar os efeitos da polpa de citros e do milho sobre as condições ruminais, estes alimentos substituíram parte da silagem de milho em rações para vacas leiteiras em lactação. Foram utilizadas 4 vacas holandesas providas de cânula ruminal, 5 períodos e 5 dietas experimentais em um delineamento estatístico em Quadrado Latino Incompleto. Amostras de fluido ruminal foram coletadas 0, 2, 4, 6, 8 e 24 horas após a alimentação para determinação de ácidos graxos voláteis. A produção de ácido acético foi maior (p&amp;lt;0,05) para a dieta que continha maior proporção de polpa de citros do que a dieta onde o milho foi incluído. A inclusão de milho associado com a polpa de citros aumentou (p&amp;lt;0,05) a produção de ácido propiônico. A produção...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Alimentação animal; Polpa de citros; Ácidos graxos voláteis; Rúmen.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000200030

Internal drainage and nitrate leaching in a corn-black oat-corn succession with two split nitrogen applications
Provedor de dados: 63
Autores: Fernandes,Flávia Carvalho Silva; Libardi,Paulo Leonel; Carvalho,Laércio Alves de.
Excessive nitrate leaching represents a potential groundwater contamination. This study was carried out in an experiment area located in the city of Piracicaba/SP- Brazil, on a sandy-clayey loam soil. The objective was to evaluate internal drainage and nitrate leaching at the depth of 0.80 m in a crop succession, using 15N-labeled ammonium sulfate, in two split N applications. Evaluations were based on two corn crops, the first grown during the 2003/2004 cropping season, and the second in the 2004/2005 season, and on a black oat crop grown during the off-season. Treatments consisted of a single 120 kg N ha-1 rate, in the form of labeled (15N) ammonium sulfate, and two split N applications at 30-90 and 60-60 kg N ha-1. The fertilizer was applied in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Flux density; 15N-ammonium sulfate; No-till; Soil solution.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000500011

Comportamento de extratores em solo tratado com fontes diversas de fósforo
Provedor de dados: 63
Autores: Stefanutti,R.; Muraoka,T.; Malavolta,E.
Em condições de casa-de-vegetação foram feitos sete cultivos sucessivos para avaliar o efeito direto e residual do superfosfato simples granulado e do termofosfato magnesiano (Yoorin) fornecidos em quatro doses (O, 50,100 e 200 ppm). O fósforo disponível foi determinado depois do terceiro, quarto e último cultivos usando-se os extratores de Mehlich 1, Bray 1, resina e a técnica de diluição isotópica (valor E). De um modo geral, os coeficientes de correlação mais altos entre P disponível e matéria seca ou fósforo total absorvido, foram encontrados com os dados obtidos com resina e Mehlich 1, seguindo-se os obtidos com Bray 1 e, em último lugar, os com o valor E.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Adubos fosfatados; Extratores; Fósforo disponível.
Ano: 1994
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000100017

Magnesium-induced alterations in the photosynthetic performance and resistance of rice plants infected with Bipolaris oryzae
Provedor de dados: 63
Autores: Moreira,Wiler Ribas; Bispo,Wilka Messner da Silva; Rios,Jonas Alberto; Debona,Daniel; Nascimento,Clístenes Williams Araújo; Rodrigues,Fabrício Ávila.
Brown spot (BS), caused by the fungus Bipolaris oryzae, is one of the most important diseases contracted by rice. We investigated the effect of magnesium (Mg) on the development of BS, caused by Bipolaris oryzae, and the effects of disease development on the photosynthetic performance of rice (Oryza sativa L.) plants (cv. Metica-1) grown in nutrient solutions containing 0.25 or 4.0 mM of Mg. Assessments of BS severity, leaf Mg and pigment concentrations (total chlorophylls and carotenoids), were carried out at 120 h after inoculation, in addition to gas exchange parameters,. Higher leaf concentration of Mg was observed in plants supplied with 4.0 mM Mg than in those supplied with 0.25 mM. The increase in leaf Mg was accompanied by a decrease in BS...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Oryza sativa; Foliar disease; Macronutrient; Photosynthesis; Plant nutrition.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162015000400328

On tactical crop management using seasonal climate forecasts and simulation modelling: a case study for wheat
Provedor de dados: 63
Autores: Meinke,H.; Stone,R.C.
The El Niño/Southern Oscillation phenomenon strongly influences rainfall distribution around the world. Using phases of the Southern Oscillation Index (SOI) allows a probabilistic forecast of future rainfall that can be useful to managers of agricultural systems. Using wheat as an example, we show in this study how the SOI phase system, when combined with a cropping systems simulation capability, can be used operationally to Improve tactical crop management and hence increase farm profits and/or decrease production risks. We show the validity of the approach for two contrasting locations, namely Dalby in Northern Australian and Piracicaba in Brazil At Dalby, highest median yields were achieved following a rapidly rising SOI phase in April/May and lowest...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Climatic variability; Crop and systems modelling; Crop production forecasts.
Ano: 1997
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161997000300014

Atividade de buprofezin sobre a cigarrinha verde do feijoeiro Empoasca kraemeri (Ross &amp;amp; Moore, 1957) (Hemiptera, Cicadellidae) em condições de laboratório
Provedor de dados: 63
Autores: Moreno,Paulo Rogério; Nakano,Octávio.
A espécie Empoasca kraemeri é uma importante praga para a cultura do feijoeiro (Phaseolus vulgaris L.) em toda a América Latina, sendo necessário recorrer ao controle químico quando a praga atinge alta população. Neste trabalho, foi estudado o efeito do inseticida buprofezin sobre ninfas de primeiro instar de Empoasca kraemeri (Hemiptera, Cicadellidae), sob condições de laboratório. Esta fase da praga mostrou-se altamente susceptível ao inseticida, sendo a CL50 estimada de 0,112 mg L-1. Em outro bioensaio, casais virgens e recém-emergidos foram colocados em contato com plantas de feijoeiro previamente imersas na calda do inseticida. A longevidade média para fêmeas/machos foi de: 46/27, 18/16 e 16/14 dias para a testemunha, 10 e 50 mg L-1 de buprofezin,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phaseolus vulgaris; Fecundidade; Esterilização química.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000300011

Elemental contents in exotic Brazilian tropical fruits evaluated by energy dispersive X-ray fluorescence
Provedor de dados: 63
Autores: Oliveira,Alessandra Lopes de; Almeida,Eduardo de; Silva,Fernanda Bevilácqua Rodrigues da; Nascimento Filho,Virgílio Franco.
The exotic flavor of Brazilian tropical fruits led to increased consumption. Consumers awareness regarding balanced diets, makes necessary determining nutritional composition - vitamins and minerals of the fruits ordinarily consumed. This study contributed to the evaluation of macro (K, Ca) and microelements (Mn, Fe, Cu, Zn and Br) in eight exotic Brazilian tropical fruits: "abiu" (Lucuma caimito Ruiz &amp;amp; Pav.), "jenipapo" (Genipa americana L.), "jambo rosa" (rose apple, Eugenia Jambos L.), "jambo vermelho" (Syzygium malaccence L., Merr &amp;amp; Perry), "macaúba" (Acrocomia aculeata Jacq. Lood. Ex Mart.), "mangaba" (Hancornia speciosa), "pitanga" (Brazilian Cherry, Eugenia uniflora L.), and tamarind (Tamarindus indica L.), using the Energy...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: EDXRF; Microelements; Macroelements; Chemical analyses.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000100013

Resistência estomática, tensão de água no xilema e teor de clorofila em genótipos de gravioleira
Provedor de dados: 63
Autores: Nogueira,Rejane Jurema Mansur Custódio; Silva Jr.,Josué Francisco da.
As variáveis ecofisiológicas exercem grande influência, não somente no comportamento vegetativo das plantas cultivadas, mas sobretudo no seu desempenho em relação às características produtivas. Este trabalho verificou a resistência à difusão de vapor, as relações hídricas e o teor de clorofila em dois genótipos de gravioleira (Morada e Comum), sob condições naturais de cultivo. O estudo foi realizado num pomar comercial do município de Paudalho, PE, em duas épocas (setembro e dezembro de 1998). O delineamento estatístico foi o inteiramente casualizado com seis repetições para cada genótipo. De cada repetição foram selecionadas duas folhas sadias, completamente expandidas, localizadas no terço médio das copas e diretamente expostas à radiação solar. No...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Annona muricata; Transpiração; Potencial hídrico; Resistência difusiva; Fotossíntese.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000300009

Gamma irradiation in the control of pathogenic bacteria in refrigerated ground chicken meat
Provedor de dados: 63
Autores: Spoto,Marta Helena Filet; Gallo,Cláudio Rosa; Alcarde,André Ricardo; Gurgel,Maria Sílvia do Amaral; Blumer,Lucimara; Walder,Júlio Marcos Melges; Domarco,Rachel Elisabeth.
This work evaluated the effect of gamma radiation on reducting the population of Staphylococcus aureus, Escherichia coli and Salmonella typhimurium in ground chicken breast stored under refrigeration. The experiment included a control and 4 doses of gamma radiation (2.0, 4.0, 6.0 and 8.0 kGy) along with 5 periods of storage under refrigeration (1, 7, 14, 21 and 28 days). Samples of ground chicken breast were inoculated with Staphylococcus aureus (ATCC 14458), Escherichia coli (ATCC 11105) and Salmonella typhimurium (ATCC 0626), irradiated at temperatures between 4 and 8°C and stored under refrigeration (5°C) for 28 days. The increased radiation dose and period of storage under refrigeration caused a reduction of Staphylococcus aureus, Escherichia coli and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gamma irradiation; Pathogenic bacteria; Chicken meat; Refrigeration.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000300003

Planning soil tillage using quality function deployment (QFD)
Provedor de dados: 63
Autores: Milan,Marcos; Barros,José Wandmark Duarte; Gava,José Luiz.
The Brazilian forest sector represents about 4% of gross domestic product (GDP) which is correspondent to US$ 21.0 billion. The natural forest area is approximately 4.8 million hectares and for the near future there will be a need to increase the planted area. To avoid or minimize the impact of mechanized practices on forest soils, the reduced tillage has been developed. The aim of this work is to define the technical priorities of the reduced tillage for eucalyptus seedlings, using quality function deployment (QDF). The design requirements classified as the most important to attend seedling demands were the furrow width and depth, and clod sizes. QFD has the potential to be applied to agro-forestry systems to translate plant demands into technical...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: QFD; Quality; Mechanization; Soil tillage; Forestry.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000200003

Genetic diversity and heterotic grouping of sorghum lines using SNP markers
Provedor de dados: 63
Autores: Silva,Karla Jorge da; Pastina,Maria Marta; Guimarães,Claudia Teixeira; Magalhães,Jurandir Vieira; Pimentel,Leonardo Duarte; Schaffert,Robert Eugene; Pinto,Marcos de Oliveira; Souza,Vander Fillipe de; Bernardino,Karine da Costa; Silva,Michele Jorge da; Borém,Aluízio; Menezes,Cicero Beserra de.
ABSTRACT: Sorghum breeding programs are based predominantly on developing homozygous lines to produce single cross hybrids, frequently with relatively narrow genetic bases. The adoption of complementary strategies, such as genetic diversity study, enables a broader vision of the genetic structure of the breeding germplasm. The purpose of this study was to evaluate the genetic diversity of sorghum breeding lines using structure analysis, principal components (PC) and clustering analyses. A total of 160 sorghum lines were genotyped with 29,649 SNP markers generated by genotyping-by-sequencing (GBS). The PC and clustering analyses consistently divided the R (restorer) and B (maintainer) lines based on their pedigree, generating four groups. Thirty-two B and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sorghum bicolor; Principal components; Restorer; Maintainer; Heterosis; Hybrid parents.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000601102

Bioprospecting and selection of growth-promoting bacteria for Cymbidium sp. orchids
Provedor de dados: 63
Autores: Gontijo,Júlia Brandão; Andrade,Gracielle Vidal Silva; Baldotto,Marihus Altoé; Baldotto,Lílian Estrela Borges.
ABSTRACT: Inoculants containing bacteria which promote growth in plants can increase productivity and both the economic and the environmental cost in plant crop systems. Similarly, in the flower and ornamental plant sector, the use of diazotrophic bacteria is a promising approach for improving orchid propagation from tissue culture to the ex vitro environment. We isolated diazotrophic bacteria from the roots and leaves of Cymbidium sp. The isolates were used to inoculate Cymbidium sp. plantlets during acclimatization in the nursery. After 150 days, plants were collected and their morphological and nutritional characteristics assessed. Eight bacterial strains were isolated containing traits that promote plant growth: Bacillus thuringiensis, Burkholderia...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Orchidaceae; Diazotrophic bacteria; Phosphate-solubilizing bacteria; Endophytic bacteria; Acclimatization.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162018000500368

Sombreamento e o desenvolvimento e produção de rabanete
Provedor de dados: 63
Autores: Souza,José Roberto Pinto; Mehl,Heroy Ótilo; Rodrigues,João Domingos; Pedras,José Figueiredo.
O efeito de três níveis de sombreamento (0, 30 e 50%) sobre o desenvolvimento, partição dos assimilados e a produção de rabanetes (Raphanus sativus L.), cultivar "Vermelho Redondo", foi estudado em condições de campo, município de São Manuel, SP. As avaliações foram realizadas aos 7, 14, 21 e 28 dias após a emergência. O sombreamento prolongou o ciclo de desenvolvimento da cultura, reduziu o teor de clorofila, expandiu a área foliar e afetou a produção de raízes tuberosas, enquanto que com 30% de sombreamento não houve redução no tamanho nem na massa das raízes.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Raphanus sativus; Rabanete; Sombreamento; Produção; Ciclo de desenvolvimento.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000400029

Agrometeorology and plant disease management: a happy marriage
Provedor de dados: 63
Autores: Gillespie,Terry James; Sentelhas,Paulo Cesar.
Many plant disease outbreaks are triggered by suitably warm temperatures during periods of leaf wetness. Measurements or estimations of leaf wetness duration provided by Agrometeorologists have allowed Plant Pathologists to devise weather timed spray schemes which often reduce the number of sprays required to control plant diseases, thus lowering costs and benefitting the environment. In the near future, tools such as numerical weather models with small grid spacings, and improved weather radar, are expected to reduce the need for tight networks of surface observations. The weather models will also provide growers with forecast warnings of potential upcoming disease outbreaks, which will further enhance the contribution of agrometeorology to plant disease...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Leaf wetness duration; Temperature; Disease warning systems.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000700012

Estimation of leaf area for greenhouse cucumber by linear measurements under salinity and grafting
Provedor de dados: 63
Autores: Blanco,Flávio Favaro; Folegatti,Marcos Vinícius.
The measurement of leaf area by linear parameters is a useful tool when plants cannot be destroyed for direct measurement. The objectives of this study were to establish equations to estimate the leaf area of greenhouse-cucumber and to evaluate the effects of salinity and grafting on this estimative. Non-grafted cucumber seedlings, cv. 'Hokushin', were transplanted in a greenhouse and were irrigated with water of different salinities (1.0, 3.2 and 5.0 dS m-1). In the second growing period, the same cultivar was grafted on Cucurbita spp. and the plants were irrigated with water of 1.4, 3.0 and 5.3 dS m-1. Leaves of different sizes were collected from both experiments and leaf area was determined by an integrating area meter. Leaf length (L) and width (W)...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Regression; Irrigation water salinity.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000400001

Estudo da influência da época de coleta dos ramos, no enraizamento de etacas caulinares de café (Coffea arabica L. cv "Mundo Novo")
Provedor de dados: 63
Autores: Ono,E.O.; Rodrigues,J.D.; Pinho,S.Z. de.
Na propagação vegetativa através de estacas caulinares, a época de retirada dos ramos, que serão utilizados na confecção das estacas, tem grande influência sobre seu enraizamento. Outro fator de grande relevância é o tratamento auxínico, realizado nas estacas, que promove a formação de raízes. O presente trabalho teve como objetivo, verificar a ação das auxinas e do boro e a influência da época de coleta dos ramos de cafeeiro, sobre o enraizamento de ramos ortotrópicos semi-lenhosos de café (Coffea arabica L. cv "Mundo Novo"). Para tal, o experimento foi montado mensalmente, realizando-se as seguintes medidas , mediante coleta das estacas, após 90 dias do plantio: número de estacas enraizadas e número total de raízes formadas. À partir dos resultados...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Estacas; Café; Enraizamento; Auxinas; Boro.
Ano: 1992
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161992000400006

Effects of glutamine on performance and intestinal mucosa morphometry of broiler chickens vaccinated against coccidiosis
Provedor de dados: 63
Autores: Luquetti,Brenda Carla; Alarcon,Miguel Frederico Fernandez; Lunedo,Raquel; Campos,Daniel Mendes Borges; Furlan,Renato Luís; Macari,Marcos.
ABSTRACT This study aimed to assess the effects of glutamine as feed additive on performance and intestinal mucosa morphometry of broiler chickens vaccinated against coccidiosis. A total of 400 day-old male chicks were randomly assigned to four treatments (NVNG – no vaccination, no glutamine supplementation; NVG – no vaccination, glutamine supplementation (10 g kg−1); VNG – vaccination, no glutamine supplementation; VG – vaccination, glutamine supplementation) replicated four times with 25 birds per replicate. A commercial sprayed-on vaccine against coccidiosis containing Eimeria acervulina, E. maxima, E. mivati, and E. tenella was administered at the hatchery. Broiler performance was evaluated from 1-28 days, and morphometric parameters were analyzed at...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anticoccidial vaccines; Intestinal ephitelium; Gut morphometry; Glutamine supplementation; Small intestine.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000400322

ESTs analysis in maize developing kernels exposed to single and combined water and heat stresses
Provedor de dados: 63
Autores: Andjelković,Violeta; Ignjatović-Micić,Dragana.
Molecular and metabolic response of plants to a combination of two abiotic stresses is unique and cannot be directly extrapolated from the response of plants to each of the stresses individually. cDNA macroarray has become a useful tool to analyze expression profiles and compare the similarities and differences of various expression patterns. A macroarray of approximately 2,500 maize (Zea mays L.) cDNAs was used for transcriptome profiling in response to single and simultaneous application of water and high temperature stress of maize developing kernels at 15 days after pollination. All stress treatments (water stress-WS, heat stress-HS and their combined application-CS) induced changes in expression of 106 transcripts with 54 up-regulated and 52...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Abiotic stress; Down-regulation; Macroarray; Up-regulation.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000300013

Quality of pitaya fruit (Hylocereus undatus) as influenced by storage temperature and packaging
Provedor de dados: 63
Autores: Freitas,Sérgio Tonetto de; Mitcham,Elizabeth Jeanne.
Pitaya (Hylocereus undatus) is an exotic non-climacteric fruit that reaches its best eating quality when harvested ripe, decreasing thereafter during storage. Our objectives were to determine the best combination of storage temperature and use of perforated plastic bags to maintain the postharvest quality of the fruit. Fruits were stored at 5, 7, or 10 ºC with and without a perforated plastic bag for 20 days, followed by five days at 20 ºC without the bag for shelf-life determination. Storage at 5 ºC, followed by 7 ºC maintained better visual appearance of the pitaya fruit after 20 days, by reducing decay incidence and severity, and maintaining greener bracts compared with fruit stored at 10 ºC. Pitaya fruit stored at 5 ºC without a perforated plastic bag...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chilling injury; Decay; Dragon fruit; Pitahaya; Weight loss.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162013000400006

Eletroquímica das partículas coloidais e sua relação com a mineralogia de solos altamente intemperizados
Provedor de dados: 63
Autores: Fontes,Maurício Paulo F.; Camargo,Otávio Antônio de; Sposito,Garrison.
O conhecimento das propriedades eletroquímicas das partículas minerais dos solos altamente intemperizados é imprescindível para o avanço dos estudos em diferente áreas da Ciência do Solo, como, Física, Manejo e Conservação, Fertilidade e Poluição do Solo. Nesse contexto, o comportamento das cargas superficiais e seu relacionamento com a mineralogia dos solos de carga variável é de importância fundamental para o entendimento e a melhoria da capacidade preditiva de diversos fenômenos, tais como dispersão e floculação de colóides, troca catiônica, adsorção de ânions, especialmente os fosfatos, adsorção de metais pesados, etc. Assim, essa revisão de literatura faz uma abordagem científica do tema "Eletroquímica das partículas coloidais e sua relação com a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: PCZ; Carga superficial; Solos tropicais; Mineralogia.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000300029

Expression of the sigma35 and cry2AB genes involved in Bacillus thuringiensis virulence
Provedor de dados: 63
Autores: Guidelli-Thuler,Ana Maria; Abreu,Irlan Leite de; Lemos,Manoel Victor Franco.
There are several genes involved in Bacillus thuringiensis sporulation. The regulation and expression of these genes results in an upregulation in Cry protein production, and this is responsible for the death of insect larvae infected by Bacillus thuringiensis. Gene expression was monitored in Bacillus thuringiensis during three developmental phases. DNA macroarrays were constructed for selected genes whose sequences are available in the GenBank database. These genes were hybridized to cDNA sequences from B. thuringiensis var. kurstaki HD-1. cDNA probes were synthesized by reverse transcription from B. thuringiensis RNA templates extracted during the exponential (log) growth, stationary and sporulation phases, and labeled with 33PadCTP. Two genes were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cry genes; Gene expression; Sigma factor.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000300016

Genetic potential of common bean parents for plant architecture improvement
Provedor de dados: 63
Autores: Silva,Vanessa Maria Pereira e; Carneiro,Pedro Crescêncio Souza; Menezes Júnior,José Ângelo Nogueira de; Carneiro,Vinícius Quintão; Carneiro,José Eustáquio de Souza; Cruz,Cosme Damião; Borém,Aluizio.
In common bean (Phaseolus vulgaris L.) breeding, plant selection that associate erect plant architecture, high yield, and grains with good commercial acceptance has been the choice of breeders. Thus, this study aimed to evaluate potential parents, to obtain promising segregating populations that associate high yield, erect plant architecture and carioca grain type, as well as to obtain information on heterosis, general and specific combining ability of these parents regarding grain yield and traits related to plant architecture. Fourteen common bean lines were crossed under a partial diallel scheme. Group 1 was composed by eight erect plant lines and group 2 by six carioca grain type lines. The F1's plants from the crosses and the 14 parents were evaluated...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phaseolus vulgaris L.; General and specific combining ability; Partial diallel; Quantitative genetics.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162013000300005

Nutrient contents and production of rocket as affected by nitrogen concentrations in the nutritive solution
Provedor de dados: 63
Autores: Cavarianni,Rodrigo Luiz; Cecílio Filho,Arthur Bernardes; Cazetta,Jairo Osvaldo; May,André; Corradi,Mariana Marotti.
Empiricism in the use of nutrient solutions is frequent. Several times the same nutrient solution is used to grow different species based only on morphological similarities. This practice may lead to nutritional imbalances, affecting not only the production but also the quality of the product due to an accumulation of nitrate. An experiment under hydroponic conditions - the NFT system - was conducted with the aim of evaluating the effect of the concentration of nitrogen in the nutrient solution on the production and on the nutrient and nitrate contents of rocket (Eruca sativa) salad leaves. The experiment was carried out in spring 2003, in a randomized block design and in a 4 x 3 factorial design, with four replicates. Four nitrogen concentrations in the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Eruca sativa; Diplotaxis tenuifolia; Hydroponic system; Cultivar; Mineral nutrition.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000600013

DIMSUB, a computer program for designing microirrigation subunits. Tool definition and case studies
Provedor de dados: 63
Autores: Palau,Carmen Virginia; Arviza,Jaime; Balbastre,Iban; Manzano,Juan.
ABSTRACT: DIMSUB is a computer program to complement a decision support tool (DST) to effectively study different hydraulic design alternatives in microirrigation systems. We developed environments in Visual Basic for applications for Microsoft Excel® that allow specific step-by-step functions to be created for the design of irrigation subunits. Different alternatives can be considered, such as types of emitter, lateral and submain pipe sizes, different feeding points, irregular subunit shapes and topography slopes. Furthermore, specific uniformity criteria need to be considered to achieve efficient water applications and proper design systems. Lengths of run lateral and submain pipes, position of the hydrant connection, pressure head and head loss in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Irrigation; Emission uniformity; Dripper; Manifold.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000300100

Common bean genotypes for agronomic and market-related traits in VCU trials
Provedor de dados: 63
Autores: Chiorato,Alisson Fernando; Carbonell,Sérgio Augusto Morais; Bosetti,Fátima; Sasseron,Graziele Ramos; Lopes,Rodrigo Lorencetti Tunes; Azevedo,Cleber Vinícius Giaretta.
Value for Cultivation and Use (VCU) trials are undertaken when evaluating improved common bean (Phaseolus vulgaris L.) lines, and knowledge of agronomic and market-related traits and disease reaction is instrumental in making cultivar recommendations. This study evaluates the yield, cooking time, grain color and reaction to anthracnose (Colletotrichum lindemuthianum), Fusarium wilt (Fusarium oxysporum f. sp. phaseoli) and Curtobacterium wilt (Curtobacterium flaccumfaciens pv. flaccumfaciens) of 25 common bean genotypes derived from the main common bean breeding programs in Brazil. Seventeen VCU trials were carried out in the rainy season, dry season and winter season from 2009 to 2011 in the state of São Paulo. Analyses of grain color and cooking time were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phaseolus vulgaris; Fusarium wilt; Curtobacterium wilt; Anthracnose; Selection.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162015000100034

Soil water dynamics and litter production in eucalypt and native vegetation in southeastern Brazil
Provedor de dados: 63
Autores: Silva,Paulo Henrique Muller da; Poggiani,Fabio; Lima,Walter de Paula; Libardi,Paulo Leonel.
High productivity of eucalypt plantations is the result of advances in research that have led to gradual improvements in intensive silvicultural technology. High productivity notwithstanding, eucalypt plantations remain the focus of environmental concerns. Our study aimed to compare the soil water regime, litter fall and nutrients dynamics either in a fragment of native forest or in an adjacent stand of growing eucalypt. We took field measurements during the first three years of eucalypt plantation in a sandy soil in the southeastern region of Brazil. Soil moisture and internal drainage were higher during the early stages of growth of the eucalypt stand, as compared with native vegetation. However, one and a half years after planting, available soil water...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Initial growth; Soil water flow; Soil solution; Nutrient cycling.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162014000500005

Using near infrared spectroscopy to predict metabolizable energy of corn for pigs
Provedor de dados: 63
Autores: Ferreira,Silvia Letícia; Vasconcellos,Ricardo Souza; Rossi,Robson Marcelo; Paula,Vinicius Ricardo Cambito de; Fachinello,Marcelise Regina; Huepa,Laura Marcela Díaz; Pozza,Paulo Cesar.
ABSTRACT: The chemical composition of corn is variable and the knowledge of its chemical and energetic composition is required for an accurate formulation of the diet. This study aimed to determine the chemical composition, that is, dry matter (DM), mineral matter (MM), neutral detergent fiber (NDF), acid detergent fiber (ADF), ether extract (EE), crude protein (CP), gross energy (GE) and energetic values of different varieties (batches) of corn and validate mathematical models to predict the metabolizable energy values (ME) of corn for pigs using near infrared spectroscopy (NIRS). Corn samples were scanned in the spectrum range between 1,100 and 2,500 nm, the model parameters were estimated by the modified partial least squares (MPLS) method. Ten...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chemical composition; Prediction equations; Validation; Swine.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162018000600486

Optimal plant density and nitrogen rates for improving off-season corn yields in Brazil
Provedor de dados: 63
Autores: Faria,Italo Kaye Pinho de; Vieira,José Luís Vilela; Tenelli,Sarah; Almeida,Rodrigo Estevam Munhoz de; Campos,Leonardo José Motta; Costa,Rodrigo Veras da; Zavaschi,Eduardo; Almeida,Risely Ferraz de; Carneiro,Leandro de Mello e Silva; Otto,Rafael.
ABSTRACT: Integrating plant density and nitrogen (N) management is a strategy for improving corn yields, especially for off-season corn production in the tropics. This study tested the hypothesis that increasing plant densities and N rates promotes yield gains for off-season corn production in high-yielding environments. The aim of the study was to investigate the yield performances of two hybrid versions (DKB PRO and DKB PRO3) submitted to three plant densities (55,000; 65,000 and 75,000 plants ha−1) and four N rates (control, 60, 120 and 180 kg ha−1 N). Field trials were undertaken at Uberlândia-MG (site1 and 2) and Pedro Afonso-TO (site 3), Brazil from which data on corn yield parameters were collected and analyzed. Multivariate analysis separated the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays; Hybrid; Population; Corn yield; Second-crop.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162019001400344

Resposta de cultivares de algodão ao boro em solução nutritiva
Provedor de dados: 63
Autores: Rosolem,Ciro Antonio; Esteves,José A.F.; Ferelli,Laudo.
Em lavouras de algodão (Gossypium hirsutum) que receberam calagem, é comum o aparecimento de deficiência de B. Há recomendações de adubação boratada, baseadas nas respostas da variedade IAC 20, que não é mais cultivada. O objetivo do trabalho foi avaliar a resposta dos cultivares CNPA-ITA 90 (Deltapine) e IAC 22 ao B, comparadas à IAC 20. Plantas de algodão foram cultivadas em solução nutritiva contendo 0, 7, 14, 21 e 28 mmol L-1 de B. As plantas do tratamento sem boro foram descartadas por não apresentarem crescimento suficiente para análise. Foi analisada a produção de matéria seca e absorção de B. As três variedades apresentaram resposta semelhante aos níveis de B da solução, tanto em termos de produção de matéria seca, como em número de estruturas...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gossypium hirsutum; Algodão; Boro; Micronutriente.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000300027

Comparative morphological analysis of cherry tomato fruits from three cropping systems
Provedor de dados: 63
Autores: Stertz,Sônia Cachoeira; Espírito Santo,Ana Paula do; Bona,Cleusa; Freitas,Renato João Sossela de.
Attempts to meet produces market demand are not always followed by research reports showing the impact of novel, intensive cropping systems on the environment, human and animal health, and eventual chemical and structural changes of plants. This work carries a comparative evaluation of the morphology and anatomy of cherry tomato fruits obtained from organic, conventional and hydroponic cropping systems. Fruits were collected at the free market in the greater Curitiba, Paraná, Brazil. For each culture method, 50 fruits their weight, diameter and volume measured. For the anatomical analysis, samples of the pericarp of ten fruits were excised and embedded in glycol methacrylate; 6-mm cuts were then obtained, stained with toluidine blue, and mounted on...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lycopersicon esculentum; Morphology; Organic; Hydroponic; Conventional.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000300015

Morphological and physiological changes during maturation of okra seeds evaluated through image analysis
Provedor de dados: 63
Autores: Santos,Rayssa Fernanda dos; Gomes-Junior,Francisco Guilhien; Marcos-Filho,Julio.
ABSTRACT: This study was performed to associate specific morphological parameters, defined by X-ray images, with seed performance of okra (Abelmoschus esculentus (L.) Moench) during maturation. Fruits of cultivar Santa Cruz 47 at different developmental stages were collected at five-day intervals (from 5 to 65 days after anthesis) and water content, dry matter, germination and vigor were determined in seeds extracted immediately after each harvest or after temporary storage for seven days. X-ray tests were also performed after each harvest and the images were analyzed by ImageJ® software to produce data of aspect ratio (relation between major and minor axes of the ellipse surrounding the seed perimeter) and percentage of free space area in the inner seed...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Physiological potential RGB; Aspect ratio; Free space; Seed maturity.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000300600

Probabilistic tools for assessment of pest resistance risk associated to insecticidal transgenic crops
Provedor de dados: 63
Autores: Maia,Aline de Holanda Nunes; Dourado Neto,Durval.
One of the main risks associated to transgenic crops expressing Bacillus thuringiensis (Bt) toxins is the evolution of pest resistance. The adoption of Bt crops requires environmental risk assessment that includes resistance risk estimation, useful for definition of resistance management strategies aiming to delay resistance evolution. In this context, resistance risk is defined as the probability of the Bt toxin resistance allele frequency (RFreq) exceeding a critical value (CriticalFreq). Mathematical simulation models have been used to estimate (RFreq) over pest generations. In 1998, Caprio developed a deterministic simulation model with few parameters that can be used to obtain RFreq point estimates from point information about model parameters and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bacillus thuringiensis; Bt crops; Modeling; Uncertainty analysis.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000500003

ESTUDO COMPARATIVO DA EVOLUÇÃO DO NÍVEL DE TRIPTOFANO EM RAMOS DE AMEIXEIRA (Prunus salicina Lindl.)
Provedor de dados: 63
Autores: ROSSAL,P.A.L.; KERSTEN,E.; CONTER,P.F.
Foram coletados ramos das cultivares de ameixa, "Sangall", "All producer", "Ace", "Beauty" e "Roxo Itaquera", em pomar da Fazenda Palma da UFPel, Pelotas, RS, para um estudo comparativo vizando a propagação por estaquia. As coletas foram realizadas em intervalos de 15 dias de julho à dezembro de 1994. Através da determinação dos níveis de triptofano nas estacas concluiu-se que a melhor época para retirada de ramos para estaquia é de 14 à 28 de setembro.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ameixeira; Propagação; Estaquia; Triptofano; Época.
Ano: 1997
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161997000200010

Citrus sinensis leaf petiole and blade colonization by Xylella fastidiosa: details of xylem vessel occlusion
Provedor de dados: 63
Autores: Alves,Eduardo; Leite,Breno; Pascholati,Sérgio Florentino; Ishida,Maria Lúcia; Andersen,Peter Craig.
Citrus variegated chlorosis (CVC), caused by Xylella fastidiosa, is an important disease of citrus in Brazil. X. fastidiosa is restricted to xylem vessels of plants and knowledge regarding xylem colonization is still limited. Our goal was to verify how this bacterium colonizes and spreads within xylem vessels of sweet orange Citrus sinensis cv. Pêra. Petioles and pieces of leaf blades from naturally infected plant exhibiting characteristic symptoms were prepared for light microscopy (LM), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and immunogold labeling (IGL). Petioles from healthy plants were used as control. IGL results, using an antibody against wall hemicelluloses, revealed that the pit membrane of vessels was altered....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ultrastructure; Scanning electron microscopy; Transmission electron microscopy; Immunolabel.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000200011

Rare earth elements in gneiss regoliths in southern Minas Gerais, Brazil
Provedor de dados: 63
Autores: Ferreira,Edilene Pereira; Guerra,Adriano Ribeiro; Azevedo,Antonio Carlos de.
ABSTRACT: Regolith characterization in its entirety is particularly difficult in gneissic regoliths due to the heterogeneity of their rock structure. Rare earth elements (REE) are a useful tool in helping understand the evolution of regoliths. This study relates the mineralogy and weathering indexes of three gneisses regoliths (P1-leucocratic, P2-mesocratic and P3-melanocratic gneisses) to the distribution of REE at depth. In soil, clay activity, iron and manganese oxides, CaO, SiO2, P2O5, TiO2, Fe2O3, and MgO showed high positive correlation with REE. The absolute content of REE was enriched in mafic minerals. At the interface between the soil and saprolite, the sum of absolute REE content was greater in soil than in saprolite in P1, while the opposite...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Saprolite; Weathering; Pedogenesis.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000301404

Modelo iterativo para estimativa da evapotranspiração de referência provável
Provedor de dados: 63
Autores: Marques Jr,S.; Saad,J.C.C.; Moura,M.V.T. de.
O presente trabalho teve por objetivo a apresentação de um modelo iterativo para utilização em microcomputadores capaz de estimar valores de evapotranspiracão de referencia em diversos níveis de probabilidade, a partir de uma série de dados. O procedimento matemático envolvido na técnica iterativa empregada relaciona-se à utilização das funções de densidade gama incompleta e beta. Para tanto, foram utilizados dados quinzenais de evapotranspiracão do mês de março, a partir de uma série de 30 anos para a região de Piracicaba-SP. Através do teste de Kolmogorov-Smirnov, verificou-se que dados estimados através do modelo apresentaram alto grau de ajuste com dados relatados em literatura, justificando assim sua utilização.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Evapotranspiracão; Modelo iterativo; Função beta.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000200003

INFLUÊNCIA DE HERBICIDAS APLICADOS EM CONDIÇÕES DE PÓS-EMEGÊNCIA NO CRESCIMENTO DA PLANTA E FIXAÇÃO SIMBIÓTICA DO  NITROGÊNIO NA CULTURA DO AMENDOIM
Provedor de dados: 63
Autores: NOVO,M.C.S.S.; CRUZ,L.S.P.; PEREIRA,J.C.V.N.A.; NAGAI,V.
Foi realizado experimento em Ribeirão Preto, SP, com o objetivo de avaliar a necessidade de inocular sementes de amendoim (Arachis hypogaea L. cv Tatu) e o efeito de herbicidas aplicados em pós-emergência no crescimento da planta, na nodulação, na fixação simbiótica do nitrogênio e na produtividade. O experimento foi em parcelas subsubdivididas com as parcelas principais dispostas em blocos ao acaso, com quatro repetições. Nas parcelas estudou-se o efeito da inoculação das sementes. Nas subparcelas, além do tratamento testemunha, aplicou-se os herbicidas fomesafen (250 g/ha), lactofen (192 g/ha), fluazifop-p-butil (187 g/ha), haloxifop-metil (240 g/ha) e a mistura fomesafen (250 g/ha) + fluazifop-p-butil (187 g/ha). Não houve efeito de herbicidas na massa...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Arachis hypogaea L.; Inoculação de sementes; Nodulação; Herbicide.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000200017

Formulação das dietas, desempenho e qualidade da carcaça, produção e composição de dejetos de suínos
Provedor de dados: 63
Autores: Nones,Kátia; Lima,Gustavo J.M.M. de; Bellaver,Cláudio; Rutz,Fernando.
A eficiência de utilização dos alimentos pelos animais pode ser influenciada pela maneira como as informações de composição e digestibilidade dos nutrientes são utilizadas. A formulação de rações para suínos baseada no conceito de proteína bruta pode apresentar níveis de aminoácidos desbalanceados ocasionando a desaminação dos aminoácidos em excesso. O nitrogênio disponível pode ser utilizado na síntese de outros compostos ou simplesmente excretado, o que significa perda de eficiência no processo e aumento da capacidade poluente dos dejetos produzidos. Assim, foram realizados dois experimentos para estudar os efeitos do uso de formulação de dietas para suínos em crescimento e terminação. As dietas foram: 1) formulação baseada nas exigências de proteína...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Excreção de nitrogênio; Ganho de peso; Proteína ideal.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000400003

Híbridos de amoreira adubados com matéria orgânica e gesso agrícola na produção de bicho-da-seda
Provedor de dados: 63
Autores: Bellizzi,Nilton Cezar; Marchini,Luís Carlos; Takahashi,Roque.
A variedade de amoreira e a nutrição da mesma são fatores determinantes na produção de massa verde pela planta, no desenvolvimento do bicho-da-seda e na sua produção dos casulos. Este trabalho teve como objetivo avaliar o efeito da matéria orgânica (2 kg de esterco de galinha/planta) e matéria orgânica associada ao gesso agrícola (2 kg de esterco de galinha/planta + 250 g de gesso agrícola/planta) em três híbridos de amoreira, IZ 64, IZ 19/13 e IZ 56/4, sobre a produção de folhas e ramos da amoreira, peso e teor líquido de seda dos casulos do bicho-da-seda. O híbrido IZ 56/4 e a adubação com matéria orgânica associada ao gesso agrícola proporcionaram as melhores produções de folhas e de ramos pela amoreira, influenciando positivamente no peso médio dos...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Morus sp.; Bombyx mori; Adubação orgânica; Gesso agrícola.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000200019

Editorial
Provedor de dados: 63
Autores: Sentelhas,Paulo Cesar; Reichardt,Klaus; Alleoni,Luís Reynaldo Ferraciú.
Tipo: Info:eu-repo/semantics/other
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000700001

Bean cultivation in a subsistence farming system in the northeast of São Paulo state - Brazil
Provedor de dados: 63
Autores: Oliveira,Wladecir Salles de; Tsai,Siu Mui.
The colonization of the State of São Paulo, Brazil of the northeastern region, is related to historical movements, such as "tropeirismo" (séc. XVIII and XIX) and Italian immigration (séc. XIX). The agriculture presently practices used by farmers descendent of immigrants does not differ from the techniques used at the beginning of the century. In the Cunha region of the Atlantic Rain Forest ecosystem poor bean yield associated with low fertilizer input, plant disease and soil erosion led to slash-and-burn farming. This work is an attempt at identifying sustainable farming practices that would minimize bean disease and maximize nitrogen assimilation. For that purpose soil fertility and plant cultivar were studied under standard agronomic practices to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phaseolus vulgaris; Rhizobium tropici; Landrace; Lime; Molybdenum.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000200008

A rapid method for measuring soil water content in the field with a areometer
Provedor de dados: 63
Autores: Calbo,Adonai Gimenez.
The availability of a rapid method to evaluate the soil water content (U) can be an important tool to determine the moment to irrigate. The soil areometer consists of an elongated hydrostatic balance with a weighing pan, a graduated neck, a float and a pynometric flask. In this work an areometer was adapted to rapidly measure soil water content without the need of drying the soil. The expression U = (M A - M AD)/(M M -M A) was used to calculate the soil water content. In this equation M M is the mass to level the areometer with the pycnometric flask filled with water, M A the mass to level the areometer with a mass M M of soil in the pycnometer, the volume being completed with water, and similarly M AD the mass added to the pan to level the areometer with...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Hydrostatic balance; Irrigation moment; Pycnometer; Soil humidity.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000400029

Quantificação da micropropagação de Curcuma zedoaria Roscoe
Provedor de dados: 63
Autores: Mello,Marcia O.; Amaral,Antônio F. C.; Melo,Murilo.
Curcuma zedoaria Roscoe, planta pertencente à família Zingiberaceae que se propaga vegetativamente, tem sido utilizada amplamente por suas propriedades terapêuticas. O interesse na propagação em massa de plantas medicinais in vitro tem aumentado sensivelmente, pois os métodos convencionais de propagação limitam o potencial de utilização destas plantas. Ápices caulinares foram inoculados em meio de cultura sólido contendo os sais básicos e vitaminas de Murashige &amp;amp; Skoog, suplementado com 2,0 mg L-1 de BAP e 30 g L-1 de sacarose. As culturas foram incubadas em sala de crescimento a temperatura de 25±2°C com fotoperíodo de 16/8 horas de claro/escuro. Transferências e repicagens foram realizadas a cada 40 dias. Os resultados das avaliações feitas...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zedoaria; Cultura de tecido; Produção; Muda.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000400016

Qualidade das operações de preparo de solo por controle estatístico de processo
Provedor de dados: 63
Autores: Milan,Marcos; Fernandes,Ricardo Alves Thomaz.
A concorrência em escala mundial obriga as empresas a buscar maior eficiência administrativa e operacional. As técnicas de controle estatístico de processo (CEP) são uma das ferramentas que permitem a melhoria da qualidade e produtividade nas empresas. Desenvolvido e largamente aplicado nas indústrias, o CEP tem grande potencial de utilização na agropecuária. Tendo em vista o desenvolvimento desse potencial, esse trabalho tem por objetivo avaliar os efeitos da utilização do controle de qualidade em operações agrícolas de preparo do solo para a cultura do milho utilizando-se como ferramenta de análise o CEP. A utilização do controle na operação de escarificação proporcionou redução da variabilidade de dados de profundidade de trabalho média em 38,4% e...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays; Mecanização; Máquinas agrícolas; Implemento.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000200009

Applying the NDVI from satellite images in delimiting management zones for annual crops
Provedor de dados: 63
Autores: Damian,Júnior Melo; Pias,Osmar Henrique de Castro; Cherubin,Maurício Roberto; Fonseca,Alencar Zachi da; Fornari,Ezequiel Zibetti; Santi,Antônio Luis.
ABSTRACT: The utilization of Normalized Difference Vegetation Index (NDVI) data obtained through satellite images can technically improve the process of delimiting management zones (MZ) for annual crops, resulting in socio-economic and environmental benefits. The aim of this study was to compare delimited MZ, using crop productivity data, with delimited MZ using the NDVI obtained from satellite images in areas under a no-tillage system. The study was carried out in three areas located in the state of Rio Grande do Sul, Brazil. Three crop productivity maps, from 2009 to 2015, were used for each area, whereby the NDVI was calculated for each crop productivity map using images from the Landsat series of satellites. Descriptive and geostatistical analysis were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fuzzy c-means clustering; Productivity data; Aerial images; Vegetation index.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000100101

Laser-induced fluorescence of organic matter from a Brazilian Oxisol under sewage-sludge applications
Provedor de dados: 63
Autores: González Pérez,Martha; Milori,Débora Marcondes Bastos Pereira; Martin-Neto,Ladislau; Colnago,Luiz Alberto; Camargo,Otávio Antonio de; Berton,Ronaldo; Bettiol,Wagner.
Sludge applications have been used to maintain fertility of agricultural soils without damaging the natural ecosystem. The aim of this study was evaluating the influence of sewage-sludge addition on the quality of organic matter (OM) of a Brazilian Oxisol by Laser Induced Fluorescence (LIF). LIF was used to analyze OM of whole soil and different soil fractions separated by chemical and physical methods. The high fluorescence contribution of humin fraction to the fluorescence of whole soils was shown, stressing the importance of studying OM associated to mineral matrix of soil. Spectra with different shapes were obtained for every particle size fraction, indicating differences in organic compounds bounded to them. The fraction with the higher carbon content...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Tropical soil; Spectroscopy; Particle size fraction; Chemical fractions.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000300009

Ácido salicílico inibe a formação de micorrizas arbusculares e modifica a expressão de quitinases e b-1,3-glucanases em raízes de feijoeiro
Provedor de dados: 63
Autores: Costa,Heron Salazar; Ríos-Ruiz,Winston Franz; Lambais,Marcio Rodrigues.
Os mecanismos que controlam o processo de colonização intrarradicular por fungos micorrízicos arbusculares ainda não são conhecidos, mas podem envolver o sistema de defesa vegetal. Normalmente, em condições favoráveis à formação de micorrizas arbusculares (MAs), e.g. baixo fosfato (P), ocorre supressão da expressão de genes de defesa, como quitinases e b-1,3-glucanases, em certos estágios do desenvolvimento das simbioses. Assim, a inibição do crescimento fúngico intrarradicular em condições de alto P pode ser decorrência da atenuação da supressão e/ou indução de genes de defesa específicos. Se o sistema de defesa está envolvido no controle do crescimento fúngico intrarradicular em condições de alto P, a aplicação às raízes de um indutor de respostas de...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Resposta de defesa; Colonização intrarradicular; Fosfato.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000100005

Distribution of cadmium in a cultivated soil in Britanny, France
Provedor de dados: 63
Autores: Hadlich,Gisele Mara; Ucha,José Martin.
Cadmium (Cd) can be potentially toxic to the environment, and its bioavailability is related to the chemical forms it occurs in the soils. The distribution of Cd into the solid phase and its availability was investigated in a cultivated soil in Britanny, France. Cd sequential extraction was performed using a modified Tessier's sequential extraction protocol. Total content of Cd (n = 22 samples) ranged from 0.13 to 0.37 mg kg¹. Long term history of organic and mineral fertilizers application increased Cd concentration in the surface horizon. The fate of Cd was correlated with soil available P2O5 concentration and pH. The regression analysis (linear and non-linear) and Principal Component Analysis revealed the synergistic effect of P2O5 in the retention of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cd; Soil pollution; Tessier protocol; Sequencial extraction.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000600017

Economic optimization of the number of recipients in bovine embryo transfer programs
Provedor de dados: 63
Autores: Beltrame,Renato Travassos; Barioni,Luis Gustavo; Maestri,Breno Dala; Quirino,Celia Raquel.
Purchase and maintenance of recipient females account for a large proportion of the costs and determine the number of calves that can be produced in an embryo transfer program. However, the large variability of embryo production by the donors and the need to purchase and synchronize the recipients before knowing the number of embryos collected make it difficult for the decision maker to identify the ideal number of recipient females to allocate. An ex-ante evaluation to determine the optimal number of recipient females was carried out through a sensitivity analysis for the ratio between the number of recipients and donors in a simulation model. The variability for the number of embryos collected was accounted for by applying the Monte Carlo simulation...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Monte Carlo; Mathematical model; Simulation; Cost estimation; Estrus synchronization.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000300002

Temperature during soybean seed storage and the amount of electrolytes of soaked seeds solution
Provedor de dados: 63
Autores: Vieira,Roberval Daiton; TeKrony,Dennis Merlin; Egli,Dennis Bruce; Bruenning,William Patrick; Panobianco,Maristela.
The electrical conductivity test measures the electrolytes that leach out of seeds when they are immersed in water and this leakage is an indication of seed vigor. The level of standardization reached by the procedures of this test is such that the test is recommended for pea seeds and suggested for other large seeded legumes, including soybean [Glycine max (L.) Merrill]. This study was conducted to contribute to the standardization of this test for soybean seeds by verifying whether the seed storage temperature influences the composition of the leachate from soaked seeds solution. Two soybean seed lots of distinct physiological potential were stored in moisture-proof containers either at constant temperatures of 10ºC and 20ºC or at the temperature of 20ºC...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycine max; Vigor; Deterioration.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000500008

Characteristics of a tractor engine using mineral and biodiesel fuels blended with rapeseed oil
Provedor de dados: 63
Autores: Godeša,Tone; Jejčič,Viktor; Poje,Tomaž.
One of the most unfavourable characteristics of crude vegetable oil when used as the fuel is the high viscosity. To improve this weakness, oil can be blended with mineral diesel or biodiesel fuels. This study was designed to evaluate how the use of mineral diesel or biodiesel blend with cold pressed rapeseed (Brassica napus) oil affects the engine power, torque and fuel consumption. A tractor equipped with direct injection, water cooling system and three-cylinder diesel engine was used for the experiment. Fuels used were standard diesel fuel (diesel), rapeseed oil methyl ester - biodiesel (B100) and their mixtures with 10, 30 and 50 vol. % of cold pressed rapeseed oil (RO). Increased portion of RO in diesel fuel blends had almost no effect on the torque...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Diesel engine power; Torque; Fuel consumption.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000500003

Editorial
Provedor de dados: 63
Autores: Sivakumar,Mannava V.K.
Tipo: Info:eu-repo/semantics/other
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000700002

Salicylic acid ameliorates the adverse effect of salt stress on strawberry
Provedor de dados: 63
Autores: Karlidag,Huseyin; Yildirim,Ertan; Turan,Metin.
Strawberry is considered as a salinity sensitive species and is adversely affected in response to the salt stress in terms of growth and yield. Pot experiments were conducted to determine the effect of exogenous salicylic acid (SA) application on physiology, growth, chlorophyll and mineral content of strawberry grown under salt stress and greenhouse conditions. Strawberry plants were treated with SA at different concentrations (0.0, 0.25, 0.50 and 1.00 mM). Salinity treatments were established by adding 0 and 35 mM of NaCl to a base complete nutrient solution. Salt stress negatively affected the growth, chlorophyll content and mineral uptake of strawberry plants. However, plants treated with SA often had greater shoot fresh weight, shoot dry weight, root...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Salinity; Growth; Mineral content.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000200006

CORRELATIONS BETWEEN HOT CALCIUM CHLORIDE-EXTRACTED BORON AND CHEMICAL AND PHYSICAL ATTRIBUTES OF SOME BRAZILIAN SOILS
Provedor de dados: 63
Autores: Alleoni,Luís Reynaldo Ferracciú; Camargo,Otávio Antonio de; Valadares,José Maria Aires Silva.
Relationship between soluble boron extracted with a hot CaCl2 0.01 mol L-1 solution and pH; organic carbon; exchangeable cations; cation exchange capacity (CEC); base saturation; total, free and amorphous iron and aluminum oxide contents; clay content; and specific surface area were performed for surface and subsurface samples of five soils. The soils were a Rhodic Hapludox, an Arenic Paleudalf and three Typic Hapludox, all representative soils of the State of São Paulo, Brazil. To quantify the relations between soluble boron and the different soil characteristics, simple linear correlations and multiple regressions, using a stepwise regression program, were performed. Hot-CaCl2 extractable boron (HCB) was significantly correlated with clay content (r =...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soluble boron; Tropical soils; Simple correlation; Multiple regression analysis.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000200006

Disponibilidade de fósforo pelos extratores de Mehlich 1 e Resina em Latossolo Vermelho Amarelo, álico cultivado com três gramíneras forrageiras
Provedor de dados: 63
Autores: Corrêa,L. de A.; Haag,H.P.
É apresentado um estudo comparando os extratores de Mehlich 1 e Resina na avaliação do P disponível em Latossolo Vermelho Amarelo, álico cultivado com as gramíneas Brachiaria decumbens Stapf, Brachiaria brizantha (Hochst.) Stapf. cv. Marandu e Panicum maximum Jacq. Foram utilizados dados de dois ensaios de adubação fosfatada, um realizado em vasos em casa de vegetação e o outro no campo. Correlações entre o P extraído através de cada extrator com a produção relativa de matéria seca, o P extraído peía planta e o teor de P na planta, permitiram determinar o extrator de P mais eficiente. Os resultados mostraram que os dois extratores foram eficientes e similares na avaliação do P disponível para as três gramíneas forrageiras, sendo que o método da Resina...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Extratores de P; Gramíneas forrageiras.
Ano: 1993
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161993000200017

Fitorreguladores e remoção da gema apical no desenvolvimento do algodoeiro
Provedor de dados: 63
Autores: Soares,José Janduí.
Este trabalho teve o objetivo de avaliar o efeito de reguladores de crescimento no desenvolvimento do algodoeiro. Foram conduzidos dois experimentos; um no município de Itaju, SP, em 1992/93 e outro em Jaboticabal, SP, em 1993/94. No experimento conduzido em Itaju, foram utilizados nove tratamentos e quatro repetições, enquanto no experimento conduzido em Jaboticabal, utilizaram-se seis tratamentos e cinco repetições. Em ambos os experimentos o delineamento experimental utilizado foi de blocos ao acaso. Os resultados obtidos indicam que estes produtos melhoram a performace do algodoeiro.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gossipium hirsutum; Algodão; Regulador de crescimento.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000300016

OCORRÊNCIA DE INFLORESCÊNCIAS ANORMAIS EM VIDEIRA `Italia'
Provedor de dados: 63
Autores: QUEIROZ-VOLTAN,R.B.; JUNG-MENDAÇOLLI,S.L.; POMMER,C.V.
Em cultura de videira (Vitis vinifera L. `Italia') foram observadas em Jales, SP, no ano agrícola de 1993, plantas que apresentavam características morfológicas diferentes desse cultivar e de outras espécies deste gênero. Num mesmo ramo da planta, a ântese ocorria do ápice para a base, sentido oposto ao normalmente encontrado. As flores apresentavam pedicelo curto (quase séssil); a corola, no período da ântese não formava uma caliptra (deiscência apical), os filetes eram curtos, o estigma séssil, o ovário globoso e os nectários pouco desenvolvidos. Sugere-se que tenham ocorrido alterações genéticas, promovendo essas características anormais, que não pertencem a gênero Vitis, porém estão presentes em gêneros correlatos como Cissus, Parthenocissus e...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vitis vinifera; Uva Itália; Inflorescências anormais.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000100025

Índice de qualidade de água em microbacia sob uso agrícola e urbano
Provedor de dados: 63
Autores: Toledo,Luís Gonzaga de; Nicolella,Gilberto.
A avaliação da qualidade da água em microbacias sob diferentes usos pode ser feita pelo uso de técnicas estatísticas multivariadas. Em Guaíra (SP), foi realizado o monitoramento da qualidade da água em uma microbacia de uso agrícola e urbano com 9600 ha, no período de jun/95 a jun/96. Coletaram-se amostras de água a cada 21 dias em 5 pontos, sendo determinadas 10 variáveis (fósforo total e dissolvido, pH, oxigênio dissolvido, amônia, nitrato, condutividade elétrica, turbidez, sólidos totais em suspensão e clorofila). Calculou-se um índice de qualidade de água (IQA) através do uso da técnica de análise fatorial e do método de Bartlett. Os resultados obtidos indicaram uma diferença entre os valores de IQA para as três estações a montante da cidade de Guaira...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: IQA; Análise fatorial; Monitoramento; Poluição; Recursos hídricos; Rios.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000100026

Parametrization of the Davis Growth Model using data of crossbred Zebu cattle
Provedor de dados: 63
Autores: Biase,Adriele Giaretta; Dias,Carlos Tadeu dos Santos; Barioni,Luís Gustavo; Albertini,Tiago Zanett; Martorano,Lucieta Guerreiro; Oltjen,James W.; Lanna,Dante Pazzanese Duarte; Oliveira,Patrícia Perondi Anchão; Medeiros,Sérgio Raposo de; Torres Júnior,Roberto Augusto de Almeida.
ABSTRACT: The system of differential equations proposed by Oltjen et al. [1986, named Davis Growth Model (DGM)] to represent cattle growth has been parameterized with data from Bos taurus (British) and Bos indicus (Nellore) breeds. The DGM has been successfully used for simulation and decision support in the United States. However, the effect of about 30 years of genetic improvement and the use of different breeds may affect the model parameter values, which also may need to be re-estimated for crossbred animals. The aim of this study was to estimate parameter values and confidence intervals for the DGM with growth and body composition data from Zebu crossbred animals. Confidence intervals and asymptotic distribution were generated through nonparametric...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Asymptotic distribution; Calibrating; Cattle growth; Nonparametric bootstrap; Ordinary differential equations.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162017000100008

Molecular-assisted selection for resistance to cassava mosaic disease in Manihot esculenta Crantz
Provedor de dados: 63
Autores: Carmo,Cátia Dias do; Silva,Maiane Suzarte da; Oliveira,Gilmara Alvarenga Fachardo; Oliveira,Eder Jorge de.
The geminivirus complex known as cassava mosaic disease (CMD) is one of the most devastating viruses for cassava (Manihot esculenta Crantz). The aim of this study was to use molecular-assisted selection (MAS) to identify CMD-resistant accessions and ascertain promising crosses with elite Brazilian varieties. One thousand two hundred twenty-four accessions were genotyped using five molecular markers (NS169, NS158, SSRY028, SSRY040 and RME1) that were associated with resistance to CMD, along with 402 SNPs (single-nucleotide polymorphism). The promising crosses were identified using a discriminant analysis of main component (DAPC), and the matrix of genomic relationship was estimated with SNP markers. The CMD1 gene, previously described in M. glaziovii, was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Manihot esculenta; Breeding; Disease; Virus.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162015000600520

Jatropha curcasand Ricinus communisdisplay contrasting photosynthetic mechanisms in response to environmental conditions
Provedor de dados: 63
Autores: Lima Neto,Milton Costa; Martins,Marcio de Oliveira; Ferreira-Silva,Sérgio Luiz; Silveira,Joaquim Albenísio Gomes.
Higher plants display different adaptive strategies in photosynthesis to cope with abiotic stress. In this study, photosynthetic mechanisms and water relationships displayed byJatropha curcasL. (physic nuts) andRicinus communisL. (castor bean), in response to variations in environmental conditions, were assessed.R. communis showed higher CO2 assimilation, stomatal and mesophyll conductance thanJ. curcas as light intensity and intercellular CO2 pressure increased. On the other hand,R. communis was less effective in stomatal control in response to adverse environmental factors such as high temperature, water deficit and vapor pressure deficit, indicating lower water use efficiency. Conversely,J. curcas exhibited higher photosynthetic efficiency (gas exchange...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Abiotic stress; Castor bean; Photosynthesis; Physic nut; Acclimation.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162015000300260

Quantifying soil carbon stocks and greenhouse gas fluxes in the sugarcane agrosystem: point of view
Provedor de dados: 63
Autores: Cerri,Carlos Eduardo Pellegrino; Galdos,Marcelo Valadares; Carvalho,João Luís Nunes; Feigl,Brigitte Josefine; Cerri,Carlos Clemente.
Strategies to mitigate climate change through the use of biofuels (such as ethanol) are associated not only to the increase in the amount of C stored in soils but also to the reduction of GHG emissions to the atmosphere.This report mainly aimed to propose appropriate methodologies for the determinations of soil organic carbon stocks and greenhouse gas fluxes in agricultural phase of the sugarcane production. Therefore, the text is a piece of contribution that may help to obtain data not only on soil carbon stocks but also on greenhouse gas emissions in order to provide an accurate life cycle assessment for the ethanol. Given that the greenhouse gas value is the primary measure of biofuel product quality, biorefiners that can show a higher offset of their...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Soil organic matter; Global warming; Nitrous oxide; Ethanol.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162013000500011

Efeito do número e intervalo entre liberações de Trichogramma pretiosum riley no parasitismo e controle de Helicoverpa zea (boddie), em milho
Provedor de dados: 63
Autores: Sá,L.A. Nogueira de; Parra,J.R.P.
Estudou-se o efeito do número e intervalo de liberações de Trichogramma pretiosum Riley, no parasitismo e controle de Helicoverpa zea (Boddie) na cultura do milho. Observou-se um incremento de até 5 vezes no parasitismo de ovos quando foram realizadas 3 liberações de 100.000 adultos de T. pretiosum por ha. A redução no dano nas espigas por H. zea em áreas de liberação de T. pretiosum foi de até 26%, mostrando o potencial de controle biológico do parasitóide.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Trichogramma pretiosum; Helicoverpa zea; Controle biológico; Pragas do milho.
Ano: 1993
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161993000300006

Comparison of carbon and nitrogen determination methods for samples of a Paleudult subjected to no-till cropping systems
Provedor de dados: 63
Autores: Dieckow,Jeferson; Mielniczuk,João; Knicker,Heike; Bayer,Cimélio; Dick,Deborah Pinheiro; Kögel-Knabner,Ingrid.
Organic carbon (C) concentration evaluated by the Walkley-Black method, and total nitrogen(N)concentration determined by Kjeldahl method, were compared with corresponding results of C and N concentrations obtained through the dry combustion method (Elementar Vario EL analyzer), using samples of ten soil layers down to the depth of 107.5 cm of a kaolinitic Typic Paleudult (220-418 g clay kg-1 along the profile) subjected to no-till cropping systems [fallow bare soil, pigeon pea (Cajanus cajan L. Millsp.) plus maize, and lablab (Lablab purpureum L. Sweet) plus maize]. A close correlation (R² &gt; 0.96) was observed between the C results of the Walkley-Black and dry combustion methods, but a correction was suggested to be applied to C results of Walkley-Black...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Walkley-Black; Kjeldahl; Wet combustion; Dry combustion.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000500011

Large scale artificial rearing of Anastrepha sp.1 aff. fraterculus (Diptera: Tephritidae) in Brazil
Provedor de dados: 63
Autores: Walder,Julio Marcos Melges; Morelli,Renata; Costa,Karen Zamboni; Faggioni,Kenya Martins; Sanches,Patrícia Alessandra; Paranhos,Beatriz Aguiar Jordão; Bento,José Maurício Simões; Costa,Maria de Lourdes Zamboni.
Some species of the genus Anastrepha (Diptera: Tephritidae) are successfully managed by matching the sterile insect technique with parasitoid releases. Such strategies used in integrated pest management can be implemented only where insect mass-rearing programs are feasible. In this study, we show the process of domestication, rearing technology and quality control data obtained from 54 generations of Anastrepha sp.1 aff. fraterculus (Wiedemann, 1830) kept under fully artificial conditions. Eggs were collected by an artificial oviposition panel consisting of one side of the cage made of blue voile fabric externally covered with a thin layer of silicon rubber. They were then air-bubbled in water at 25 ºC for 48 h before seeding. Larvae were reared on the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Insect production; Insect domestication; Sterile insect technique; Integrated pest management; Fruit fly.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162014000400004

Constitutive overexpression of GmDof17-1, a putative DOF transcription factor from soybean causing growth inhibition in tobacco
Provedor de dados: 63
Autores: Yu,Jingjing; Shi,Guixia; Yu,Deyue.
The Dof proteins belong to a large family of plant transcription factors that share a single highly conserved zinc finger and play an important role in many physiological processes. To elucidate the function of Dof in soybean, GmDof17-1 was cloned from soybean (Glycine max (L.) Merr); the open reading frame (ORF) of GmDof17-1 is 846 bp and encodes a putative protein that includes 281 amino acids. Using qRT-PCR, the expression profiles of GmDof17-1 were obtained for various parts of the soybean plant. GmDof17-1 was primarily expressed in the roots and pods at various stages of pod development. The gene was ectopically expressed in tobacco under the control of the 2 × CaMV35S promoter to study the functions of the gene product. The transgenic tobacco plants...
Tipo: Info:eu-repo/semantics/article
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162014000100006

Quality of colostral passive immunity and pattern of serum protein fluctuation in newborn calves
Provedor de dados: 63
Autores: Pauletti,Patricia; Machado Neto,Raul; Packer,Irineu Umberto; D'Arce,Raul Dantas; Bessi,Rosana.
Immunity acquired by newborn animals is known as passive immunity, and for ruminants, antibody acquisition depends on the ingestion and absorption of adequate amounts of immunoglobulins from colostrum. This study relates different initial levels of acquired passive protection and serum total protein (TP) and immunoglobulin G (IgG). Serum immunoglobulin concentration and total protein were evaluated for female Holstein calves in the first sixty days of life. Animals were separated into three groups according to their initial level of passive immunity: group 1- animals with a low level of passive immunity (below 20 mg mL-1); group 2- animals with a medium level (between 20 and 30 mg mL-1), and group 3- animals with a high level (above 30 mg mL-1). Serum...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Colostrum; Dairy calves; Antibodies.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000300006

Relationship of black layer and milk line development on maize seed maturity
Provedor de dados: 63
Autores: Vieira,R.D.; Minohara,L.; Carvalho,N.M. de; Bergamaschi,M.C.M.
The relationship of black layer and milk line development on maize seed maturity was evaluated under tropical conditions. Seed moisture (g.kg-1), standard germination - SG (7 days, 25°C), and vigor, using accelerated aging-AA (96 hours, 42°C and 100% of RH), cold test-CT only in 1991/92 (7 days at 10°C and 7 days at 25°C) and electrical conductivity-EC (four 50-seed samples, 24 hours imbibition at 25°C) and milk line and black layer formation (using a five-stage rating system) were determined at 3 to 4 days intervals, using two genotypes (hybrid CX 133 and variety IAC 100) during the crop seasons of 1990/91 and 1991/92. The results showed that physiological maturity was reached before stage 4, based on seed germination and vigor (AA and CT) values, which...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Germination; Vigor; Accelerated aging; Cold test; Electrical conductivity.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000100023

Variabilidade genética de etnovariedades de mandioca, avaliada por marcadores de DNA
Provedor de dados: 63
Autores: Mühlen,Gilda Santos; Martins,Paulo Sodero; Ando,Akihiko.
O objetivo deste trabalho foi quantificar a variabilidade genética de etnovariedades ("folk varieties") de mandioca e examinar a distribuição desta variabilidade entre grupos de etnovariedades de diferentes locais de origem e tipos. Foram escolhidas 54 etnovariedades de mandioca originárias de quatro regiões brasileiras: 45 etnovariedades da Amazônia (23 do Rio Negro, 6 do Rio Branco e 16 do Rio Solimões) e 9 do litoral sul do Estado de São Paulo. A variedade moderna Mantiqueira&lt;A HREF="#1not"&gt;¹&lt;/A&gt;, de ampla distribuição mundial, também foi incluída. Destas, 38 variedades eram mandiocas bravas e 17 de mesa (aipins ou macaxeiras). Foram utilizados três tipos de marcador de DNA: RAPD, AFLP e microssatélites. A análise dos resultados consistiu na...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Manihot esculenta; Aipim; Marcador; Diversidade genética.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000200020

Initial horticultural performance of nine ‘Persian’ lime selections grafted onto Swingle citrumelo
Provedor de dados: 63
Autores: Santos,Magno Guimarães; Soares Filho,Walter dos Santos; Girardi,Eduardo Augusto; Gesteira,Abelmon da Silva; Passos,Orlando Sampaio; Ferreira,Claudia Fortes.
ABSTRACT ‘Persian’ lime (PL) [Citrus latifolia (Yu. Tanaka) Tanaka] is an important species both for domestic fresh fruit consumption in Brazil as well as the export market, since the country is one of the largest producers in the world despite the fact that, in commercial plantations, it is still not uncommon to find trees with low productivity and high plant vigor of unknown origin. Selections of Persian lime ‘CNPMF–2000’, ‘CNPMF–2001’, ‘CNPMF–01’, ‘CNPMF–02’, ‘IAC–5’, ‘IAC–5.1’, ‘Bearss’, ‘Persian–58’, and ‘5059’, were therefore grafted onto Swingle citrumelo [C. paradisi Macfad. cv. Duncan × Poncirus trifoliata (L.) Raf.] rootstocks and evaluated in Cruz das Almas, Bahia, Brazil in a field experiment conducted in a completely randomized block design...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Citrus latifolia; Rain fed cultivation; Scion cultivars.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000200109

Intrapopulation fixation index dynamics in finite populations with variable outcrossing rates
Provedor de dados: 63
Autores: Coelho,Alexandre Siqueira Guedes; Vencovsky,Roland.
The intrapopulation fixation index ( f ) is inversely related to the outcrossing rate (t). Results obtained from data on molecular markers of natural populations have shown that these values are highly variable, even when measured in the same group of individuals. It is thus suggested that factors besides those described in Wright's genetic equilibrium must be operating. Using simulated data sets this study shows that the finite size condition of a population is sufficient to spread the estimated f values along a range at equilibrium, as opposed to keeping them at the theoretical equilibrium point. The variation in outcrossing rates can amplify this range considerably. Correlation between estimated f values obtained from different loci in this condition...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Population genetics; Inbreeding; Computer simulation.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000200015

Desenvolvimento de plântulas de limoeiro 'cravo' relacionado a posição de semeadura
Provedor de dados: 63
Autores: Rodriguez Robles,Walter Geremias; Araújo,Paulo Sérgio Rodrigues de; Minami,Keigo.
Instalou-se um ensaio em casa de vegetação com o objetivo de relacionar a posição da semente e o desenvolvimento de plântulas de limoeiro `Cravo'. Foram semeadas nas três prováveis posições que a semente tomaria ao ser lançada ao solo ou substrato: 1) deitada; 2) ápice para cima e 3) ápice para baixo. Este experimento foi realizado em bandejas de poliestireno expandido com 128 células, utilizando-se como substrato a mistura de vermiculita expandida e material orgânico vegetal. Adotou-se o delineamento experimental em blocos ao acaso, com 4 repetições e 40 sementes por parcela (1 semente/célula). Aos 75 dias após à semeadura, observou-se maior quantidade de plântulas com raízes normais quando colocadas as sementes nas posições deitada e ápice para baixo. A...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Citrus limonia; Desenvolvimento radicular; Enovelamento; Raiz.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000200029

Isoenzymatic variability in tropical maize populations under reciprocal recurrent selection
Provedor de dados: 63
Autores: Pinto,Luciana Rossini; Vieira,Maria Lúcia Carneiro; Souza Jr.,Cláudio Lopes de; Silva,Rainério Meireles da.
Maize (Zea mays L.) is one of the crops in which the genetic variability has been extensively studied at isoenzymatic loci. The genetic variability of the maize populations BR-105 and BR-106, and the synthetics IG-3 and IG-4, obtained after one cycle of a high-intensity reciprocal recurrent selection (RRS), was investigated at seven isoenzymatic loci. A total of twenty alleles were identified, and most of the private alleles were found in the BR-106 population. One cycle of reciprocal recurrent selection (RRS) caused reductions of 12% in the number of alleles in both populations. Changes in allele frequencies were also observed between populations and synthetics, mainly for the Est 2 locus. Populations presented similar values for the number of alleles per...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays; Genetic markers; Genetic variability; Isozymes; Population improvement.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000200013

Colina e betaína em rações purificadas na nutrição da tilápia do Nilo (Oreochromis niloticus)
Provedor de dados: 63
Autores: Vieira,Ivan; Cyrino,José Eurico Possebon; Pezzato,Luiz Edivaldo.
Problemas metabólicos observados em produções intensivas de tilápias do Nilo (Oreochromis niloticus) têm sido relacionados à deficiência de colina nas rações. Com o objetivo de avaliar o efeito da suplementação dietética da colina na nutrição da espécie, rações purificadas contendo 0; 375; 750; 1.125; 1.500 ou 1.875 mg de cloreto de colina por kg, foram administradas ad libitum por 42 dias a tilápias do Nilo (5,09 ± 0,14 g), estocados em gaiolas de PVC atóxico (volume = 60 L), alojadas em caixas de polipropileno de 1000 L, em ambiente com condições controladas de temperatura e luminosidade, num delineamento experimental em blocos incompletos casualizados, com três parcelas por bloco (n=5). O ganho de peso (GDP) e o índice de conversão alimentar (ICA) de...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ciclídeos; Nutrição; Fator lipotrófico; Lecitina; Lipídios hepáticos.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000400004

Negative H2S character and flocculation as yeast strain markers for inoculum recovery
Provedor de dados: 63
Autores: Ribeiro,Carlos Alberto França; Horii,Jorge.
Routine identification of yeast behavior is essential to measure the control of the alcohol production process and to maintain product quality standards. This work utilized the non-hydrogen sulfide production and flocculation traits as characteristic strain markers for the evaluation of cell recycling during the alcoholic fermentation process for production of sugarcane alcohol. This study evaluated the behavior of a recombinant yeast bank made by protoplast fusion, for strain screening purposes; strain fermentative kinetics in comparison to commercial baker yeast; viability and recovery of the selected strain on differential media, after five consecutive fermentation batches; and the recovery of the selected strain from fermentation with mixed strain...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cell recovery; Hydrogen sulfide; Ethanolic fermentation; Quality control.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000300009

Manual transportation within the plot and physical damages to bananas
Provedor de dados: 63
Autores: Magalhães,Mário Jorge Maia de; Abrahão,Roberto Funes; Leal,Paulo Ademar Martins.
The manual transportation of banana bunches within plots provokes physical damages to fruits compromising their quality. To assess the influence of the distance banana bunches travel on the shoulders of harvesters within the plot, on the incidence of physical damages present on the peel of fruits of the Nanicão cultivar, two experiments were carried out in the Vale do Ribeira region (SP), in sites with slope &lt; 1%. Each experiment divided the plot in different distance bands, two of which were included in this study: one located far away from the collection roads (30-50 m and 80-100 m distance bands) and another in an intermediate position (70-80 m and 130-150 m distance bands). For each distance band, six banana bunches of 36 mm gauged fruits were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Musa cavendish; Harvesting bananas; Post-harvest; Mechanical damages.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000100006

Using termite nests as a source of organic matter in agrosilvicultural production systems in Amazonia
Provedor de dados: 63
Autores: Batalha,L. S.; Silva Filho,D. F. da; Martius,C.
The growth of two annual crops, okra (Abelmoschus escutentus) and egg-plant (Solatium melongena) and one perennial crop, andiroba (Carapa guianensis, a native forest tree of Amazonia) under different treatments with organic manure derived from termite nest material of wood-feeding Nasutitermes species was tested (randomized block design). The use of 25-100 g of nest material gave no significant increase in okra productivity, and 25-200 g gave no significant response in andiroba. The combined use of NPK with 200 g of nest material gave a significant higher production in egg-plant (total number and total fresh weight of fruits) when compared to the control (without fertilizer) and to the treatment with NPK only.The results suggest the possibility to use...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amazonia; Rain Forest; Low Soil Fertility; Crop Production; Termite Nest Material; Organic Matter; Okra; Egg-Plant; Andiroba; Amazônia; Floresta tropical úmida; Baixa fertilidade de solo; Produção agrossilvicultural; Material de cupinzeiro; Matéria orgânica; Quiabo; Berinjela; Andiroba.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000200019

Relationship between seed technology research and federal plant breeding programs
Provedor de dados: 63
Autores: Krzyzanowski,F. C.
This paper deals with the contributions seed technology can provide for soybean breeding programs for seed quality. Efforts can be placed on seed quality assurance (DIACOM) to assist the production system, from genetic up to certified seed in releasing a product of high quality. Another approach is the development of screening methods, based on seed technology tests (vigor tests), for selecting genotypes according to different traits relating to seed quality. An understanding of seed quality mechanisms, such as seed-coat properties, pod-wall permeability, seed and pod resistance to fungi infection , seed shriveling and cell wall permeability, will help to define the screening procedures for this characteristic. It has been one of the most important...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Seed; Soyabean; Plant breeding.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000500015

Soil tillage and sugarcane planting: an assessment of cost and economic viability
Provedor de dados: 63
Autores: Amorim,Fernando Rodrigues de; Patino,Marco Tulio Ospina; Santos,David Ferreira Lopes.
ABSTRACT Yield and profitability levels in sugarcane crops demonstrate the importance of the agricultural practices adopted, especially for soil preparation and planting systems. This study evaluated the costs involved in 40 alternative methods for the establishment of sugarcane crops resulting from the combination of eight soil preparation systems and five planting options, followed by an assessment of the economic viability of sugarcane production for suppliers and sugar mills. Data were collected from 31 sugar mills and 42 suppliers in São Paulo State, Brazil, from the 2016/17 season. The cost analysis and discounted cash flow analysis were used to calculate economic viability. Localized soil preparation with a fixed application rate of inputs (soil...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Saccharum spp; Mechanization; Variable rate; Yield; Profitability.
Ano: 2022
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162022000100101

Orthogonal cutting forces in juvenile and mature Pinus taeda wood
Provedor de dados: 63
Autores: Gonçalves,Raquel; Néri,Antônio Carlos.
The distinct characteristics of juvenile and mature woods, which are observed particularly in softwoods, have an influence on processing due to their different mechanical resistance properties in relation to cutting operations. In the past, when most of the wood used industrially came from adult trees of natural forests, little importance was given to a distinction between different zones of the tree stem. At present, however, as the supply of mature trees with large diameters from native forests is constantly decreasing, the use of short-cycle trees has become a common practice, through the adoption of species that grow relatively fast, such as pines and eucalyptus. In both softwoods and hardwoods, juvenile wood cells are generally smaller and thinner...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Wood machining; Softwood; Plantation wood; Cutting optimization.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000400002

Avaliação da efetividade de um programa de controle de mastite bovina em fazendas produtoras de leite B do estado de São Paulo
Provedor de dados: 63
Autores: Laranja,L.F.; Machado,P.F.
O objetivo do trabalho foi correlacionar a adoção ou não de seis práticas de manejo, higiene e terapia que compõem um Programa de Controle de Mastite com os coeficientes indicadores da prevalência e dinâmica de incidência da doença. O estudo foi desenvolvido em 7 fazendas produtoras de leite B no Estado de São Paulo durante um período de 11 meses (Março/91 a Fevereiro/92) envolvendo 1683 vacas. As medidas de controle analisadas foram as seguintes: 1) Tratamento de vacas secas, 2) Tratamento das mastites clínicas, 3) Bom manejo da ordenha, 4) Bom funcionamento do equipamento de ordenha, 5) Descarte/segregação de vacas com mastite crônica, 6) Bom conforto e higiene na área de permanência dos animais. Para fins de avaliação da prevalência e dinâmica da...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mastite; Controle; CMT.
Ano: 1994
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000300032

Characterization of streptomycetes with potential to promote plant growth and biocontrol
Provedor de dados: 63
Autores: Sousa,Carla da Silva; Soares,Ana Cristina Fermino; Garrido,Marlon da Silva.
Studies with streptomycetes in biocontrol programs and plant growth promotion are presented as technological alternatives for environmental sustainable production. This work has the objective of characterizing six isolates of streptomycetes aiming the production of extracellular enzymes, indole acetic acid, capacity for phosphate solubilization, root colonization and growth under different pH and salinity levels. For detection of enzyme activity the isolates were grown in culture media with the enzyme substrates as sole carbon source. The root colonization assay was performed on tomato seedlings grown on 0.6% water-agar medium. Growth under different pH and salinity levels was evaluated in AGS medium with 1%, 1.5%, 2%, 2.5%, and 3% NaCl, and pH levels...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Actinomycetes; Indole acetic acid; Extracellular enzymes; Siderophores.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000100007

Fatty acid composition of cane molasses and yeasts
Provedor de dados: 63
Autores: Gutierrez,L.E.; Silva,R.C.M. da.
Lipid extract and fatty acid composition of cane molasses and yeasts (Saccharomyces cerevisiae M-300-A and Saccharomyces uvarum IZ-1904) grown in molasses medium were determined. In molasses, linoleic acid was found in higher levels (around 42%) and was followed by palmitic, oleic and linolenic acids. The lipid extract varied from 1.02 to 3.13 gkg-1. In yeasts, the level of lipid extract varied from 16.65 to 31.12 g.kg-1 (dry matter basis) depending on the molasses type and yeast species. Both yeasts were able to incorporate fatty acids from molasses' and therefore linoleic and palmitic acids were the major fatty acids found in them.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Saccharomyces; Fatty acids; Yeasts; Lipids; Molasses.
Ano: 1993
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161993000300022

Soil-app: a tool for soil analysis interpretation
Provedor de dados: 63
Autores: Matias,Filipe Inácio; Sabadin,José Felipe Gonzaga; Moreira,Lílian Angélica; Gomes,Marcos Henrique Feresin; Mira,Acácio Bezerra de; Fritsche-Neto,Roberto; Otto,Rafael.
ABSTRACT New apps have changed the traditional way of learning and teaching; they are also applied as a quickly executed and effective method in agriculture. Soil-app is a web application with a friendly click-point interface built through packages lodged in R software. The app is an advanced model of an open-source platform to support teaching and learning activities in soil analyses and fertilizer recommendations. Soil-app includes soil test interpretation, soil amendment calculations (lime and gypsum), the fertilizer rate for the most important crops in Brazil, an NPK blend calculator, and NPK blend evaluation. It also includes experimental statistical analysis as applied to soil science. Soil-app is a user-friendly and high-performance tool, garnering...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Software; Fertilizers; Recommendation; Prediction; Statistical analyses.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000101404

Isotermas de langmuir e de freundlich na descrição da adsorção de boro em solos altamente intemperizados
Provedor de dados: 63
Autores: ALLEONI,L.R.F.; CAMARGO,O.A.; CASAGRANDE,J.C.
O objetivo deste trabalho foi estudar a adequação dos modelos de Langmuir e de Freundlich para descrever a adsorção do boro em amostras superficiais (0-0,2 m) e subsuperficiais (na maior expressão do horizonte B) de três solos altamente intemperizados: latossolo roxo distrófico textura muito argilosa (LR), podzólico vermelho-amarelo eutrófico textura arenosa/média (PV) e latossolo vermelho-escuro álico textura média (LE). Para a determinação da quantidade de boro adsorvido, 20 mL de soluções de CaCl2 0,01 mol.L-1 com diferentes quantidades de boro (0; 1; 2; 4; 8 e 16 &lt;FONT FACE="Symbol"&gt;m&lt;/font&gt;g.mL-1) foram adicionados a 4 g de terra fina seca em estufa e agitados por 24 h. Tanto o modelo de Langmuir como o de Freundlich adequaram-se bem aos...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Boro; Adsorção.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000300005

Relações solo, superfície geomórfica e substrato geológico na microbacia do ribeirão Marins (Piracicaba - SP)
Provedor de dados: 63
Autores: Teramoto,Edson Roberto; Lepsch,Igo Fernando; Vidal-Torrado,Pablo.
O estudo das inter-relações entre aspectos pedológicos, geológicos e geomorfológicos de uma área são importantes para a compreensão da distribuição das unidades de mapeamento de solos na paisagem, constuituindo importante ferramenta para mapeamento de solos. Com o objetivo de estabelecer essas relações, efetuou-se um mapeamento detalhado dos depósitos geológicos superficiais, das superfícies geomórficas e das unidades de solos de uma área na microbacia do ribeirão Marins em Piracicaba, SP. Tais relações foram obtidas através de um sistema geográfico de informações e de um índice de homogeneidade para avaliar quantitativamente as inter-relações de cada tema estudado. A estratigrafia da área está representada por siltitos e folhelhos da formação Corumbataí,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Relações solo geomorfologia; Estratigrafia; Pedogênese.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000200021

SELEÇÃO ELETRÔNICA PELA COR NA DESCONTAMINAÇÃO DE AMENDOIM CONTAMINADO COM AFLATOXINAS
Provedor de dados: 63
Autores: Zovico,Cristiane; Fonseca,Homero; Calori-Domingues,Maria Antonia; Glória,Eduardo Micotti; Borguini,Renata Galhardo; Silveira,Vanessa Prezzotto; Piedade,Sônia S.
Quarenta e dois lotes comerciais de 300 kg de amendoim descascado, produzidos em 1997 e contaminados com aflatoxinas, foram submetidos à seleção eletrônica pela cor para verificar a eficiência desse processo na melhoria da qualidade de lotes de amendoim quanto à diminuição da contaminação com aflatoxinas. Os lotes de amendoim foram classificados pelo tamanho como normalmente utilizados pela cerealista, sendo 22 lotes de amendoim graúdo (7,5 a 7,9mm) e 20 lotes de amendoim miúdo (6,4 a 7,1mm), nos quais os níveis de contaminação inicial variaram de 7 a 3.763 mg/kg e de 76 a 3.309 mg/kg, respectivamente. Nos 42 lotes, não foram detectadas aflatoxinas em dois lotes de amendoim graúdo e 1 de amendoim miúdo. Este trabalho demonstrou que o processo de seleção...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aflatoxina; Amendoim; Seleção eletrônica.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000200016

Genetic control of the angular leaf spot reaction in common bean leaves and pods
Provedor de dados: 63
Autores: Borel,Jerônimo Constantino; Ramalho,Magno Antonio Patto; Abreu,Ângela de Fátima Barbosa; Maia,Lucas Gontijo Silva.
Information about genetic control of plant reaction to pathogens is essential in plant breeding programs focusing resistance. This study aimed to obtain information about genetic control of the angular leaf spot reaction in leaves and pods from common bean (Phaseolus vulgaris L.) line ESAL 686. This line was crossed with cultivars Jalo EEP 558 (resistant), Cornell 49-242 (resistant) and Carioca MG (susceptible). Generations F1, F2 and backcrosses (BC11 and BC21) were obtained. In the dry season (2009), parents and respective populations were evaluated for angular leaf spot reaction under field conditions. Disease severity was evaluated on leaves and pods using diagrammatic scales. Severity scores were obtained and mean and variance genetic components were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pseudocercospora griseola; Plant disease resistance; Plant breeding; Genetic control.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000600009

Protection between strains of Papaya ringspot virus: type w in zucchini squash involves competition for viral replication sites
Provedor de dados: 63
Autores: Freitas,Débora Maria Sansini; Rezende,Jorge Alberto Marques.
A mild strain of Papaya ringspot virus - type W (PRSV-W), named PRSV-W-1, has proved to be very effective in the control of the disease in zucchini squash plants under greenhouse and field conditions. The aim of this work was to obtain additional information on the protection mechanism between PRSV-W-1 and a severe homologous strain (PRSV-W-C) in Cucurbita pepo L. cv. Caserta. Protective inoculation with the mild strain was made on the cotyledons and the challenge inoculation with the severe strain was applied on the first true expanded leaf, and vice-versa. Plants were challenged at three, six or nine days later, respectively. Plants infected with either the mild or the severe strain alone served as controls. Evaluations were based on the recovery test...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cucurbita pepo; Potyvirus; Cross protection; Preimmunization.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000200012

Hydrothermal treatment favors peeling of 'Pera' sweet orange fruit and does not alter quality
Provedor de dados: 63
Autores: Arruda,Maria Cecília de; Jacomino,Angelo Pedro; Pinheiro,Ana Luíza; Ribeiro,Rafael Vasconcelos; Lochoski,Michelle Antonio; Moreira,Raquel Capistrano.
Consumer demand for ready-to-eat-products has stimulated the development of new processing techniques to prepare fresh-cut fruit and vegetables. The aim of this study was to propose a peeling method for 'Pera' oranges (Citrus sinensis [L.] Osb.) by using a hydrothermal treatment and to determine its influence on the respiratory activity, physicochemical and sensorial characteristics, as well as on the peeling time. Cooled oranges (6ºC) were immersed in heated water (50ºC) for eight minutes and then, peeled and stored at 6ºC. The internal fruit temperatures taken at 1 and 3 cm depths (from fruit surface) were 15ºC and 10ºC, respectively, at the end of the hydrothermal treatment. Non-hydrothermally-treated peeled oranges were used as control. The peeling...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Citrus sinensis; Fresh-cut; Temperature.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000200007

L-ascorbic acid, β-carotene and lycopene content in papaya fruits (Carica papaya) with or without physiological skin freckles
Provedor de dados: 63
Autores: Souza,Leandro Marelli de; Ferreira,Karla Silva; Chaves,José Benício Paes; Teixeira,Sílvio Lopes.
The Skin Freckles is a papaya skin disorder that depreciates de fruit appearance and hampers its commercialization, although not lowering its nutritive value. Being the papaya a good source of ascorbic acid, β-carotene and licopene this research aimed at determining L-ascorbic acid, β-carotene and licopene content in papaya fruits, from 'Formosa' and 'Solo' group varieties, with and without apparent physiological skin disease (skin freckles). Fruits were harvested in the Southeast Region of Brazil. L-ascorbic acid content was determined by titration technique. β-carotene and licopene contents were determined by high performance liquid chromatography technique (HPLC). L-ascorbic acid content in papaya fruits ranged from (59.9 ± 3.4) mg 100 g-1 to (112.4 ±...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brazil; Fruits composition; Carotenoids; Vitamin C; Food composition.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000300004

Late nitrogen application enhances spikelet number in indica hybrid rice (Oryza sativa L.)
Provedor de dados: 63
Autores: Zhou,Wei; Lv,Tengfei; Chen,Yong; Hu,Jianfeng; Zhang,Qiang; Ren,Wanjun.
ABSTRACT To increase rice yield potential, field experiments were conducted in farmers’ paddies in 2011 and 2012 to evaluate the effects of different nitrogen applications on the yield and panicle components of three typical indica hybrid rice varieties in Sichuan Province. The number of grains per panicle resulting from late nitrogen application (LA) was 12 % greater than that obtained from traditional nitrogen application (TA); this increase was the main source of improvements in yield. The number of surviving and differentiated spikelets (NSS and NDiS) resulting from LA was significantly higher than that measured under TA, especially for the Fyou498 cultivar, where the NSS and NDiS increased by 15 % and 14 %, respectively. Compared with TA, the number...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Panicle; Grain number; Branch; Degenerated rate; Yield.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162017000200127

Brazilian greenhouse gas emissions: the importance of agriculture and livestock
Provedor de dados: 63
Autores: Cerri,Carlos Clemente; Maia,Stoecio Malta Ferreira; Galdos,Marcelo Valadares; Cerri,Carlos Eduardo Pellegrino; Feigl,Brigitte Josefine; Bernoux,Martial.
Data from the 1990-1994 period presented in the "Brazil's Initial National Communication" document indicated that the country is one of the top world greenhouse gas (GHG) emitters. A large majority of Brazil's GHG emissions come from deforestation mainly of the Amazon biome for agriculture and livestock land uses. This unique inventory is now out of date. Thus, the aims of this review were (i) to update estimates of the GHG emissions for the Brazilian territory, (ii) to estimate the sinks to provide calculations of the GHG net emissions for the 1990-2005 period, (iii) to calculate the actual and estimate shares of agricultural and livestock activities, and (iv) to discuss in light of the new figures and patterns the best mitigation options for Brazil....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: CO2-equivalent (CO2-eq); Soil; Inventory; Land use change and forestry.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000600017

Methodology to filter out outliers in high spatial density data to improve maps reliability
Provedor de dados: 63
Autores: Maldaner,Leonardo Felipe; Molin,José Paulo; Spekken,Mark.
ABSTRACT The considerable volume of data generated by sensors in the field presents systematic errors; thus, it is extremely important to exclude these errors to ensure mapping quality. The objective of this research was to develop and test a methodology to identify and exclude outliers in high-density spatial data sets, determine whether the developed filter process could help decrease the nugget effect and improve the spatial variability characterization of high sampling data. We created a filter composed of a global, anisotropic, and an anisotropic local analysis of data, which considered the respective neighborhood values. For that purpose, we used the median to classify a given spatial point into the data set as the main statistical parameter and took...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Precision agriculture; Local analysis; Map accuracy.
Ano: 2022
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162022000100102

Cattle manure fertilization increases fig yield
Provedor de dados: 63
Autores: Leonel,Sarita; Tecchio,Marco Antonio.
Fertilization using organic compounds is complementary to chemical fertilization, being essential to integrated fruit production. Reports on fig tree (Ficus carica L.) organic fertilization and mineral nutrition are worldwide scarce, especially in Brazil. This experiment aimed to evaluate the effects of cattle manure fertilization on the yield and productivity of the fig tree 'Roxo de Valinhos' in Botucatu, São Paulo State, Brazil, during the 2002/03, 2003/04, 2004/05 and 2005/06 crop cycles. Plants aged one, two, three and four year olds received the following cattle manure treatments: control (no fertilizer), 25%, 50%, 75%, 100%, 125% and 150% of the recommended N level for this crop. The evaluated variables were: fruit number, weight and mean diameter,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ficus carica L.; Nitrogen; Organic matter.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000600013

Main viruses in sweet cherry plantations of Central-Western Spain
Provedor de dados: 63
Autores: Sánchez,Rodrigo Pérez; Corts,Remedios Morales; Benavides,Pablo García; Sánchez,María Ángeles Gómez.
Sweet cherry trees (Prunus avium L.) are susceptible to a range of diseases, but there have been no studies to date about the viral infection of sweet cherry trees in Spain. To determine the phytosanitary status of Spanish sweet cherry plantations, the incidence and leaf symptoms induced by Prune dwarf (PDV), Prunus necrotic ringspot (PNRSV) and Apple chlorotic leaf spot (ACLSV) viruses were investigated during 2009. Young leaf samples were taken from 350 sweet cherry trees, corresponding to 17 cultivars, and were analysed by double antibody sandwich enzyme-linked immunosorbent assay (DAS-ELISA). To associate the leaf symptoms with the virus, 50 mature leaves from each infected tree were visually inspected during the summer. The ELISA results revealed that...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Prunus avium; ELISA; Stone fruit; Symptoms.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162015000100083

Humic substances isolated from residues of sugar cane industry as root growth promoter
Provedor de dados: 63
Autores: Busato,Jader Galba; Zandonadi,Daniel Basílio; Dobbss,Leonardo Barros; Façanha,Arnoldo Rocha; Canellas,Luciano Pasqualoto.
Plant growth promoting substances are widely used in modern agriculture. Several products in the market are humic substances isolated from different sources. The filter cake, a residue of sugar production, is a rich and renewable source of organic matter and these characteristics place the filter cake as a possible source of plant growth promoting substances. Humic acids (HA) from filter cake were characterized, and their effects as root growth promoters were evaluated. Chemical features of the HA were evaluated through elemental composition, acidic functional groups, E4/E6 ratio and infrared spectroscopy analyzes. The biological activity of the HA was assessed using root architecture parameters and the P-type H+-ATPase activity. The lateral root...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: H+-ATPase; Brazil; Industrial residues; Physiological effects; Bioactivity.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000200012

Soils and agriculture in central-west and north Brazil
Provedor de dados: 63
Autores: Buol,Stanley W.
Modern soil science, spearheaded by research in Brazil has facilitated the utilization of vast areas of previously uncultivated soil long considered unsuitable for human food production into highly productive agricultural land. Naturally acid soils with high contents of aluminum and iron oxides and low CEC values and organic matter contents long considered insurmountable obstacles to crop production in tropical latitudes could be extremely productive. With continued development of the infrastructure needed by commercial agriculture Brazil has the potential to lead the world in its quest to provide food for growing human populations.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cerrado soils; Brazilian Amazon; Latossolos; Oxisols; Ultisols.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000500016

Effects of irrigation and nitrogen levels on qualitative and nutritional aspects of fig-trees (Ficus carica L.)
Provedor de dados: 63
Autores: Hernandez,F.B.T.; Modesto,J.C.; Suzuki,M.A.; Corrêa,L.S.; Reichardt,K.
In order to evaluate qualitative and nutritional aspects of fig-trees with respect to six irrigation and six nitrogen levels, at Ilha Solteira, SP, Brazil, an experiment was carried out in randomized blocks, with subdivided plots, and four replications. Results showed that in four dates during harvest, only the first analysis (January 2, 1991) showed influence of nitrogen fertilization on fruit soluble solids (brix). There was no significant effect of treatments on pulp/peel relation for the four harvestings. In relation to leaf macronutrient concentration at flowering, water supply influenced N, P and Ca concentrations, and nitrogen influenced only Ca concentration. For an average of 10 t.ha-1 of mature fruit and 1.3 t.ha-1 of immature fruit production,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fig-trees; Irrigation; Nitrogen.
Ano: 1994
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000200015

Energy flow in castor bean (Ricinus communis L.) production systems
Provedor de dados: 63
Autores: Silva,Adilson Nunes da; Romanelli,Thiago Libório; Reichardt,Klaus.
Although energy analysis is a way to evaluate the sustainability of production systems, this practice is not often used in the agribusiness. In this context, the castor bean (Ricinus communis L) is an agricultural crop not yet well studied despite its great potential in the Brazilian energetic scenario. This article aimed to evaluate the productive potential of the castor bean oil, using an energetic view applied to two management systems: low (System 1) and medium (System 2) technologies. The quantification of the used material fluxes was made converting these factors in energy units. The input energy fluxes were 3,170.6 MJ ha¹ and 10,366.0 MJ ha¹ for Systems 1 and 2, respectively. The energy balance of System 1 was 11,938.2 MJ ha¹ and that of System 2...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Energetic balance; Oil crops; Production technology; Cultivation systems.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000600018

Comportamento de três hortaliças de fruto submetidas ao aquecimento intermitente durante a frigoconservação
Provedor de dados: 63
Autores: KLUGE,R.A.; MODOLO,V.A.; JACOMINO,A.P.; SCARPARE FILHO,J.A.; TESSARIOLI NETO,J.; MINAMI,K.
Efeitos do aquecimento intermitente foram estudados em berinjelas, pimentões e quiabos refrigerados. Berinjelas `Piracicaba F-100' foram continuamente refrigeradas por 21 dias ou aquecidas a cada 3, 4, 5 ou 6 dias. Pimentões `Maiata' foram continuamente refrigerados por 28 dias ou aquecidos a cada 5, 6, 7 ou 8 dias. Quiabos `Santa Cruz-47' foram continuamente refrigerados por 8 dias, ou aquecidos aos 2, 3, 4 ou 5 dias. O armazenamento foi realizado à 5ºC e 90-95% UR. O aquecimento foi realizado por 24 horas à 24-25ºC e 70-75% UR (condições ambientais). O aquecimento intermitente reduziu os sintomas de injúrias pelo frio, mas provocou elevadas perdas de massa em muitos tratamentos, causando murchamento e reduzindo a comerciabilidade dos frutos após a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Berinjela; Pimentão; Quiabo; Injúrias pelo frio; Perda de massa.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000300016

UNA ALTERNATIVA PARA DETECTAR OBSERVACIONES  INFLUYENTES EN FUNCIONES DE PRODUCCIÓN UNIVARIADAS
Provedor de dados: 63
Autores: RINCÓN,L.F.; LÓPEZ,L.A.; IEMMA,A.F.
En muchas aplicaciones agrícolas o biológicas, se ajustan modelos basados en funciones de producción Yi = (Xi, &lt;FONT FACE="Symbol"&gt;q&lt;/font&gt;) + e para un conjunto de variables predictoras Xj j = 1,. . . , k y un vector parámetros &lt;FONT FACE="Symbol"&gt;q&lt;/font&gt;. En este trabajo se presenta una alternativa para detectar observaciones influyentes, cuando la función de producción es univariada y la estimación de los parámetros se realiza por el método de Gauss - Newton.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Función de producción; Observacione influyente.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000200018

EFFECT OF FALLOW LAND, CULTIVATED PASTURE AND ABANDONED PASTURE ON SOIL FERTILITY IN TWO DEFORESTED AMAZONIAN REGIONS
Provedor de dados: 63
Autores: DIEZ,J.A; POLO,A; DIAZ-BURGOS,M.A; CERRI,C.C; FEIGL,B.J; PICCOLO,M.C.
The effect of two practices adopted by settlers (abandoned pasture and fallow land) on soil fertility of two deforested Amazonian regions (Belém-Pará and Ariquemes-Rondônia) was studied. Whenever possible, cultivated pasture, over similar time periods in both cases and in natural forest, were employed as soil fertility reference standards. Nutrient dynamics was studied using the electroultra-filtration technique. In general, deforestation, as practiced in these areas, has a degrading effect on soil fertility. The effect of burning normally leads to a pH rise caused by ash. This usually yields a favorable transitory effect, improving soil fertility conditions, however not sufficient for plant needs, as inferred from the low P and K levels. Cattle...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Deforestation; Fallow land; Abandoned pasture.
Ano: 1997
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161997000100007

Desenvolvimento de plantas de ervilha (Pisum sativum L.), submetidas à diferentes potenciais da água no solo: índices fisiológicos
Provedor de dados: 63
Autores: Aguiar Netto,A.O.; Rodrigues,J. D.; Bastos,E. A.; Ono,E. O.
A ervilha é cultivada no Brasil Central, durante o inverno seco, exigindo para o pleno êxito da cultura o uso da irrigação. Assim, o presente trabalho se propõe a avaliar os efeitos do potencial da água no solo nos índices fisiológicos da análise quantitativa de crescimento de plantas de ervilha (Pisum sativum L.). O experimento foi montado em casa de vegetação, em solos de textura argilosa, com delineamento experimental inteiramente casualizado, com quatro tratamentos decorrentes de potenciais mínimos da água no solo (-33, -100, -200 e -1500 kPa) em três repetições, cada qual contendo duas plantas de ervilha, cultivar Caprice. Os resultados obtidos evidenciaram que a redução do potencial água no solo, induziu o decréscimo na área foliar, sem interferir no...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ervilha; Potencial da água no solo; Analise quantitativa de crescimento.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000300018

Performance and hematology of pacu fed diets supplemented with vitamins C and/or E
Provedor de dados: 63
Autores: Garcia,Fabiana; Pilarski,Fabiana; Onaka,Eduardo Makoto; Moraes,Flávio Ruas de.
Pacu (Piaractus mesopotamicus Holmberg, 1887) is a valued Brazilian fish species for aquaculture. This is highly susceptible to disease, and feed supplementations for pacu can be a very important strategy to prevent disease incidence in fish farms. The aim of this study was to evaluate a strategic supplementation for pacu. Juvenile pacu (10.5 ± 1.2 g) were fed diets containing three levels of vitamins C and/or E (0, 250, and 500 mg vitamin kg-1 diet). Fish were fed diets without supplementation for two months prior to the experiment. After that period, experimental feeding was initiated for two months. Growth and hematological evaluations were made on the thirtieth and sixtieth days of feeding. Pacu fed diet without supplementation of vitamins C and E...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Piaractus mesopotamicus; Ascorbic acid; Feed supplementation; Tocopherol.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000300007

Errata
Provedor de dados: 63
Tipo: Info:eu-repo/semantics/article
Ano: 1994
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000300034

Biological and molecular characterization of Brazilian isolates of Zucchini yellow mosaic virus
Provedor de dados: 63
Autores: Spadotti,David Marques de Almeida; Wassano,Débora Targino; Rezende,Jorge Alberto Marques; Camargo,Luis Eduardo Aranha; Inoue-Nagata,Alice Kazuko.
Zucchini yellow mosaic virus (ZYMV) causes substantial economic losses in cucurbit crops. Although ZYMV has been present in Brazil for more than 20 years, there is little information about the biological and molecular characteristics of the isolates found in the country. This study aimed to characterize the experimental hosts, pathotypes and genetic diversity of a collection of eleven Brazilian ZYMV isolates within the coat protein gene. For biological analysis, plant species from Amaranthaceae, Chenopodiaceae, Cucurbitaceae, Fabaceae, Solanaceae, and Pedaliaceae were mechanically inoculated and pathotypes were identified based on the reaction of a resistant Cucumis melo, accession PI414723. All of the cucurbit species/varieties and Sesamum indicum were...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Potyvirus; Nucleotide sequence; Genetic diversity.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162015000200187

Agriculture and food security challenge of climate change: a dynamic analysis for policy selection
Provedor de dados: 63
Autores: Ahmed,Ferdous; Al-Amin,Abul Quasem; Mohamad,Zeeda Fatimah; Chenayah,Santha.
ABSTRACT This study presents an empirical examination of climate change related to vulnerability impacts on food security and remedial adaptation options as a suitable strategy by prioritizing needs over a 50-year period. An Empirical Dynamic Commutable General Equilibrium Model for Climate and the Economy (EDCGECE) is applied using future strategies for Malaysia against a baseline scenario of existing conditions, following the top-down options. The model takes into account various climatic variables, including climatic damage, carbon cycle, temperature and rainfall fluctuation, carbon emissions, vulnerability and carbon concentrations, which were adapted from national observational predictions of climatic changes caused by global warming from 2015 to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: CGE; Policy development; Strategies; Agricultural sustainability.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000400311

Spatial distribution of plant-parasitic nematodes in sugarcane fields
Provedor de dados: 63
Autores: Dinardo-Miranda,Leila Luci; Fracasso,Juliano Vilela.
Nematodes are important parasites of sugarcane in Brazil. Because of this, several studies have been conducted in recent years to evaluate the effectiveness of control methods. However, no studies have been reported on the spatial distribution of nematodes in sugarcane fields, and such studies are indispensable for the development of sampling plans, aimed at their application in integrated management programs. The spatial distribution of Meloidogyne javanica, Pratylenchus zeae, and mixed populations of P. zeae and P. brachyurus was studied in six commercial fields, with areas ranging from 0.26 to 0.50 ha; samples were obtained during the rainy season. The samples, represented by about 50 g roots, were collected within a rectangular grid measuring 7 × 12 m,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Saccharum; Meloidogyne; Pratylenchus; Spatial variability; Population.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000200007

HERANÇA DA TOLERÂNCIA AO ALUMÍNIO EM TRIGO
Provedor de dados: 63
Autores: Camargo,Carlos Eduardo de Oliveira; Ferreira Filho,Antonio Wilson Penteado; Felicio,João Carlos.
Cruzamentos e retrocruzamentos foram efetuados entre os cultivares de porte semi-anão IAC-24 e Anahuac, tolerante e sensível à toxicidade de alumínio, respectivamente. Plântulas dos parentais e da geração F1 do cruzamento entre eles bem como dos retrocruzamentos para ambos os parentais foram avaliadas em soluções nutritivas de tratamento contendo 2 mg/litro de Al3+. Progênies de gerações F2 e F3 do cruzamento e progênies F2 dos retrocruzamentos foram também avaliadas . A tolerância à toxicidade de alumínio foi medida pela capacidade de crescimento da raiz primária central em solução nutritiva completa, após um tratamento de 48 horas em solução contendo 2 mg/litro de Al3+. O cultivar IAC-24 diferiu do Anahuac por um par de genes dominantes para tolerância à...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Trigo; Cultivar tolerante; Cultivar sensível; Toxicidade de alumínio; Genes dominantes; Solução nutritiva.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000200024

Optimum size in grid soil sampling for variable rate application in site-specific management
Provedor de dados: 63
Autores: Nanni,Marcos Rafael; Povh,Fabrício Pinheiro; Demattê,José Alexandre Melo; Oliveira,Roney Berti de; Chicati,Marcelo Luiz; Cezar,Everson.
The importance of understanding spatial variability of soils is connected to crop management planning. This understanding makes it possible to treat soil not as a uniform, but a variable entity, and it enables site-specific management to increase production efficiency, which is the target of precision agriculture. Questions remain as the optimum soil sampling interval needed to make site-specific fertilizer recommendations in Brazil. The objectives of this study were: i) to evaluate the spatial variability of the main attributes that influence fertilization recommendations, using georeferenced soil samples arranged in grid patterns of different resolutions; ii) to compare the spatial maps generated with those obtained with the standard sampling of 1 sample...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil attributes; Grid sampling; Kriging; Cross-validation; Kappa statistic.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000300017

Simulação do processo de secagem de sementes de milho em camada fixa
Provedor de dados: 63
Autores: Souza,Cristiano Márcio Alves de; Queiroz,Daniel Marçal de; Lacerda Filho,Adílio Flauzino de.
O processo de secagem realizado de maneira artificial é apontado por vários pesquisadores como um dos principais problemas de produção de sementes. Além disso, esse processo afeta também a qualidade dos grãos, diminuindo consideravelmente o seu valor de mercado para o consumo. O objetivo deste trabalho foi desenvolver um modelo de simulação do processo de secagem de sementes de milho (Zea mays L.), validando-o por meio da comparação de resultados simulados com os de testes experimentais. O método de secagem utilizado consistiu em promover a pré-secagem das sementes nas espigas, posteriormente o produto permanecia em repouso durante 12 horas, sendo então as espigas debulhadas e complementada a secagem a granel, em silos com distribuição radial de ar. A...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Milho em espiga; Secadores; Modelagem matemática.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000400005

Tensile strength, friability and organic carbon in an oxisol under a crop-livestock system
Provedor de dados: 63
Autores: Guimarães,Rachel Muylaert Locks; Tormena,Cássio Antonio; Alves,Sérgio José; Fidalski,Jonez; Blainski,Éverton.
The crop-livestock system can promote soil compaction in surface layers, mainly due to animal trampling. However, plants and their root growth, in interaction with animal trampling, can decrease the deleterious changes in soil structure caused by this system. Up to the present time, the physical soil modifications in crop-livestock systems, including oat and ryegrass crops for winter animal forages are unknown. The objective of this study was to quantify and to relate tensile strength, friability and soil organic carbon in an Oxisol under a crop-livestock system. The study was conducted in Campo Mourão - Paraná, Brazil. Four forage heights were used for the winter forages: 7, 14, 21 and 28 cm. For each forage height, five soil blocks were randomly...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aggregate; Soil structure; No-tillage; Soil physical quality; Microstructure.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000400011

Sensory and physicochemical characteristics of low sodium salami
Provedor de dados: 63
Autores: Almeida,Marcio Aurelio de; Villanueva,Nilda Doris Montes; Pinto,Jair Sebastião da Silva; Saldaña,Erick; Contreras-Castillo,Carmen J.
ABSTRACT The aim of the present study was to develop low sodium salami prepared with pork, low-fat beef and a small quantity of pork back fat (150 g kg−1). Sodium chloride (NaCl) was replaced by potassium chloride (KCl) and calcium chloride (CaCl2), and salamis were tasted to obtain low-salt salami with sensory characteristics similar to those found in commercial ones. Salamis were prepared following seven different treatments. Treatments included five different combinations of KCl and CaCl2 which varied from 5 g kg−1 to 10 g kg−1 and two controls containing high (25 g kg−1) and low (10 g kg−1) concentrations of NaCl. The right level of saltiness of each treatment was evaluated on “just-about-right” (JAR) scales and analyzed by Penalty Analysis. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Salt reducing; Consumers testing; Potassium chloride; Calcium chloride; Penalty analysis.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000400347

Species composition and similarities among anuran assemblages of forest sites in southeastern Brazil
Provedor de dados: 63
Autores: Bertoluci,Jaime; Brassaloti,Ricardo Augusto; Ribeiro Júnior,José Wagner; Vilela,Vívian Maria de Faria Nasser; Sawakuchi,Henrique Oliveira.
Neotropical forests show high anuran species richness, but some Brazilian forest formations, like cerradão, semideciduous forests and restingas, remain poorly known. The composition of anuran species were determined for four forest sites belonging to different biomes in southeastern Brazil, based on two complementary techniques (visual encounter survey and survey on breeding sites), both applied simultaneously. A total of 60 anuran species belonging to eight families was recorded. Species richness and levels of endemism were higher in the Atlantic rainforest site. Sites located in the Cerrado domain were more alike than those located in the Atlantic Forest Domain. Similarity in anuran species composition was negatively correlated to the geographical...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anurans; Species richness; Species composition; Conservation.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000400007

Cultivo in vitro de ápices caulinares de abacaxizeiro para limpeza clonal em relação à fusariose
Provedor de dados: 63
Autores: Albuquerque,Cynthia Cavalcanti; Camara,Terezinha Rangel; Menezes,Maria; Willadino,Lilia; Meunier,Isabelle; Ulisses,Cláudia.
O presente trabalho teve como objetivo adequar um meio nutritivo ao cultivo de ápices caulinares de abacaxizeiro, cv. Pérola, visando a limpeza clonal de plantas infectadas por Fusarium subglutinans, agente causal da fusariose. Inicialmente, ápices de mudas sadias, tipo coroa, foram retirados sob condições assépticas e inoculados em 9 composições de meios de cultivo, com presença e ausência de BAP, GA3 e AIA. Aos 30, 45 e 60 dias após a inoculação, observou-se o grau de necrose dos explantes. Nos meios selecionados inocularam- se ápices caulinares retirados de mudas contaminadas por F. subglutinans, a fim de verificar a viabilidade da limpeza clonal. Os resultados mostraram que houve influência do meio de cultivo na regeneração de plantas e a viabilidade...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Ananas comosus; Abacaxi; Meio nutritivo; Ápice caulinar.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000200027

Slow-grown in vitro conservation of Heliconia champneiana cv. Splash under different light spectra
Provedor de dados: 63
Autores: Rodrigues,Paulo Hercílio Viegas; Arruda,Flávia; Forti,Victor Augusto.
ABSTRACT: In vitro techniques, with the purpose of conserving the genetic resources of plants, are fundamental to the feasibility of establishing germplasm banks and enabling the commercial production of micropropagated plants. The aim of this study was to evaluate the use of different spectra of light in in vitro germplasm conservation by slow grown storage of Heliconia Champneiana cv. Splash. Explants of heliconia in vitro were submitted to the following light treatments: CW (control white), B100 (100 % blue), R100 (100 % red) and R70B30 (70 % red/30 % blue), all with PFD = 25 μmol m2 s–1, maintained in vitro for two time periods, namely P1, 6 weeks and P2, twelve weeks, and were statistically evaluated after each interval with respect to: height, fresh...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Tissue culture; Micropropagation; Ornamental plants.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162018000200163

Probability density function of the number of embryos collected from superovulated Nelore breed donors
Provedor de dados: 63
Autores: Beltrame,Renato Travassos; Barioni,Luis Gustavo; Quirino,Celia Raquel; Dantas,Ozanival Dario.
Several models have been developed to evaluate reproductive status of cows through concentration of progesterone in milk, the effect of sex selection in the commercial production of herds and bioeconomic performance of the multiple ovulation and embryo transfer system in select herds. However, models describing the production of embryos in superovulated females have yet to be developed. A probability density function of the number of embryos collected by donors of the Nelore breed was determined. Records of 61,928 embryo collections from 26,767 donors from 1991 to 2005 were analyzed. Data were provided by the Brazilian Association of Creators of Zebu and Controlmax Consultoria e Sistemas Ltda. The probability density function of the number of viable...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zebu; Cattle; Reproduction; Model.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000400003

Produtividade do Panicum maximum cv. Mombaça irrigado, sob pastejo rotacionado
Provedor de dados: 63
Autores: Müller,Marcela dos Santos; Fancelli,Antonio Luiz; Dourado-Neto,Durval; García y García,Axel; López Ovejero,Ramiro Fernando.
O uso da irrigação em pastagens é uma realidade fundamentada na experiência empírica de produtores, devido à falta de bases científicas definidas sobre o assunto. O trabalho visou avaliar a produtividade do capim Mombaça (Panicum maximum Jacq. cv. Mombaça) manejado em pastejo rotacionado, sob sistema de irrigação e as principais variáveis climáticas responsáveis pelo acúmulo de massa de forragem. O experimento foi conduzido sob irrigação por aspersão tipo pivô central, de julho a dezembro de 1998, em região de cerrado (Latossolo Vermelho-Amarelo) em São Desidério, BA. Foi quantificada a massa de forragem da pastagem aos 30 dias de crescimento e antes do pastejo e desenvolvidos modelos matemáticos que relacionam a produção de forragem a variáveis...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pastagem; Irrigação; Mombaça; Modelagem.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000300003

Fluidodinâmica de sementes de brócolos em leito fluizado e leito de jorro
Provedor de dados: 63
Autores: Almeida,Celina de; Rocha,Sandra Cristina dos Santos.
Os processos em leito fluidizado e de jorro são comumente empregados para secagem, recobrimento e granulação de sistemas particulados nas indústrias química e farmacêutica, enquanto na área agronômica estão limitados a tratamento de algumas espécies de sementes. Este trabalho objetivou apresentar a análise fluidodinâmica dos leitos fluidizado e de jorro, quando são utilizadas sementes de brócolos (Brassica oleracea L. var. Italica) e verificar a influência na germinação das sementes, submetidas aos dois tipos de processo por 60 min à temperatura do ar de 25°C. A fluidodinâmica nos dois tipos de contato, leitos fluidizado e de jorro, foi estabelecida pelas medidas da queda de pressão no leito e vazões de ar crescentes e decrescentes, para diferentes cargas...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Queda de pressão; Vazão; Germinação; Fluidização.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000400004

Correlações fenotípicas entre caracteres vegetativos e de produção de palmito da palmeira real australiana
Provedor de dados: 63
Autores: Uzzo,Roberta Pierry; Bovi,Marilene Leão Alves; Spiering,Sandra Heiden; Saes,Luiz Alberto.
A seleção indireta é prática corrente no melhoramento de plantas perenes e vem sendo usada com sucesso em programas de melhoramento genético de palmeiras visando a produção de palmito. O objetivo do trabalho foi auxiliar na identificação dos caracteres de natureza não destrutiva que possam ser utilizados futuramente na indicação de palmeiras aptas à colheita e na seleção indireta de plantas superiores de palmeira real australiana (Archontophoenix alexandrae Wendl. &amp;amp; Drude). Em uma população de palmeiras com 30 meses de cultivo, foram estudados seis caracteres relacionados ao crescimento e seis caracteres componentes da produção de palmito através de análises de variabilidade, correlação e regressão múltipla. Entre os doze caracteres, o peso do...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Archontophoenix; Seleção indireta; Melhoramento genético; Caracteres agronômicos; Genótipos superiores.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000300015

Spatial variability of leaf wetness duration in cotton, coffee and banana crop canopies
Provedor de dados: 63
Autores: Santos,Eduardo Alvarez; Sentelhas,Paulo Cesar; Pezzopane,José Eduardo Macedo; Angelocci,Luiz Roberto; Monteiro,José Eduardo Boffino Almeida.
Despite the importance of leaf wetness duration for plant disease epidemiology, there has been little attention paid to research on how its variability relates to different cropping situations. The objective of this study was to evaluate the spatial variability of leaf wetness duration (LWD) in three crops, comparing these measurements with turfgrass LWD, obtained in a standard weather station. LWD was measured by electronic sensors in three crops with different canopy structures and leaf area: cotton, coffee and banana. For the cotton crop, cylindrical sensors were deployed at the lower third and on the top of the canopy, facing southwest. For the coffee crop, flat plate sensors were installed in the lower third of the canopy facing northeast and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dew; Microclimate; Plant disease; Warning systems.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000700005

POTENCIALIDADES DE LINHAGENS DE LEVEDURA Saccharomyces cerevisiae PARA A FERMENTAÇÃO DO CALDO DE CANA
Provedor de dados: 63
Autores: Ribeiro,Carlos Alberto França; Horii,Jorge.
Três linhagens de levedura da espécie Saccharomyces cerevisiae, sendo duas floculantes, das quais uma não produtora de sulfeto de hidrogênio, foram avaliadas para se verificar seus desempenhos, sob parâmetros cinéticos, bem como a formação de compostos secundários na fermentação do caldo de cana-de-açúcar, destinado à produção de aguardente. O acompanhamento da cinética fermentativa mostrou melhores resultados de eficiência de fermentação, fator de conversão de substrato em etanol e velocidade específica de crescimento pela linhagem floculante IZ 987, que foram de 89,9%, 0,46 g.g-1 e 0,0996 h-1 respectivamente. Esta linhagem foi também responsável pela maior produção de álcoois superiores, 185 mg.L-1, inerente à sua característica de não produzir H2S. A...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Leveduras; Fermentação alcoólica; Parâmetros cinéticos; Componentes voláteis; Aguardente de cana.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000200001

Novel insights into the early stages of infection by oval conidia of Colletotrichum sublineolum
Provedor de dados: 63
Autores: Souza-Paccola,Ednéia Aparecida de; Bomfeti,Cleide Aparecida; Tanaka,Francisco André Ossamu; Massola Junior,Nelson Sidnei; Colauto,Nelson Barros; Figueiredo,José Edson Fontes; Paccola-Meirelles,Luzia Doretto.
Anthracnose, caused by Colletotrichum sublineolum Henn. ex Sacc. &amp; Trotter, is one of the most important sorghum [Sorghum bicolor (L.) Moench] diseases in Brazil. This fungus exhibits conidial dimorphism, producing either falcate or oval conidia on solid and liquid media, respectively. We compared patterns of the initial infection events by these two types of conidia on sorghum leaves using light microscopy and scanning electron microscopy. The infection events during the first 24 h were similar for both oval and falcate conidia. Globose and melanized apressoria were formed at 24 h after inoculation (hai) regardless of the conidia type. Dense mycelium and oval conidia developed from germinated falcate conidia at 32 hai. Hyphal mass displaying acervuli...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sorghum bicolor; Anthracnose; Conidial dimorphism; Infection biology; Secondary sporulation.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162015000400351

Phosphorus sources and fractions in an oxisol under no-tilled soybean
Provedor de dados: 63
Autores: Galvani,Raquel; Hotta,Luiz Fernando Keyti; Rosolem,Ciro Antonio.
Phosphorus dynamics in soil can be modified by the use of no-till systems. Brazilian farmers have applied phosphorus fertilizers onto the soil surface to optimize machine field operations despite the lack of research supporting this practice. An experiment was conducted to study the effects of the application of two P sources onto soil surface and soybean seed furrows. The treatments consisted either of the application or not of 80 kg ha-1 of total P2O5 as natural reactive rock phosphate and superphosphate spread on the soil surface over the standing plant residues. At soybean planting, additional treatments (80 kg ha-1 of Natural Phosphate or Superphosphate) were applied at seed furrows. Soil was sampled down to 40 cm deep before soybean planting and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Natural phosphate; Phosphorus fertilizer; Mineral phosphorus; Organic phosphorus; Phosphorus fractioning.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000400014

Sequential path analysis: what does "sequential" mean?
Provedor de dados: 63
Autores: Kozak,Marcin; Azevedo,Ricardo Antunes.
Studying relationships among plant and crop traits is crucial for crop scientists to understand complex biological systems that occur in plants and the field. Such knowledge constitutes the basis for more practical information on how to manage breeding and production to provide better or more suitable cultivars, higher yields, lower yield gaps, and resistance to pests etc. To acquire such knowledge, however, representative models of associations between plant and crop traits must be constructed. In path analysis - one of the major methods for analyzing multivariate relationships between quantitative traits - it is important to decide on an appropriate model for these associations, a model that is representative of the corresponding biological phenomena...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Interpretation; Relationships; Models; Statistics.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162014000600012

Intestinal histomorphology in Pseudoplatystoma fasciatum fed bovine colostrum as source of protein and bioactive peptides
Provedor de dados: 63
Autores: Rodrigues,Ana Paula Oeda; Pauletti,Patricia; Kindlein,Liris; Delgado,Eduardo Francisquine; Cyrino,José Eurico Possebon; Machado-Neto,Raul.
Histological responses of the intestine are key for evaluating nutritional value of feed ingredients, since the organ is not only the chief site of feed digestion and nutrient absorption but also plays an important immunological function. Histomorphological alterations were evaluated in the intestine of juvenile striped catfish, Pseudoplatystoma fasciatum, fed diets containing 0 (control), 10 or 20% inclusion of lyophilized bovine colostrum (LBC), as source of protein or bioactive peptides, for either 30 or 60 days. Fish fed 20LBC presented at 60d a distinct pattern of macrophages and, some of them, higher number of vacuoles in rectum mucosa. The thickness of the muscle layer (TML) in fish fed diets with LBC was higher in the first portion of medium...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gut absorption; Histology; Mammal protein; Lyophilized bovine colostrum; Striped catfish.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000500005

Ethylene and lettuce seed germination
Provedor de dados: 63
Autores: Nascimento,Warley Marcos.
Ethylene can stimulate seed germination and overcome dormancy in many species. For instance, the inhibitory effect of high temperature on lettuce seed germination can be overcome by exogenous ethylene. Involvement of ethylene in seed germination is a widely accepted fact, but the mechanistic details are poorly understood. A critical factor in ethylene studies is the response of seed germination properties to various ethylene inhibitors. Lettuce seed has been used as a model to study the role of ethylene in seed germination at high temperature. The role of ethylene in germination is not known but either ethylene evolution or addition of 1-aminocyclopropane-1-carboxilic acid (ACC) have been associated with increased activity of endo-beta-mannanase, a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lactuca sativa; Thermoinhibition; Dormancy; Enzyme activity.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000300029

Bradyrhizobium strain and the 15N natural abundance quantification of biological N2 fixation in soybean
Provedor de dados: 63
Autores: Guimarães,Ana Paula; Morais,Rafael Fiusa de; Urquiaga,Segundo; Boddey,Robert Michael; Alves,Bruno José Rodrigues.
In commercial plantations of soybean in both the Southern and the Cerrado regions, contributions from biological nitrogen fixation (BNF) are generally proportionately high. When using the 15N natural abundance technique to quantify BNF inputs, it is essential to determine, with accuracy, the 15N abundance of the N derived from BNF (the 'B' value). This study aimed to determine the effect of four recommended strains of Bradyrhizobium spp. (two B. japonicum and two B. elkanii) on the 'B' value of soybean grown in pots in an open field using an equation based on the determination of δ15N natural abundance in a non-labelled soil, and estimate of the contribution of BNF derived from the use of 15N-isotope dilution in soils enriched with 15N. To evaluate N2...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bradyrhizobium elkanii; Bradyrhizobium japonicum; Glycine max; 'B' value.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000500011

Phenotyping for angular leaf spot severity and its implication in breeding common bean for resistance
Provedor de dados: 63
Autores: Pereira,Rafael; Abreu,Ângela de Fátima Barbosa; Nalin,Rafael Storto; Souza,Elaine Aparecida de.
ABSTRACT: Phenotyping for severity of angular leaf spot (ALS) in common bean is important to identify new sources of resistance and select progenies in conventional and molecular marker-assisted breeding. In this study, three phenotyping methods for ALS severity were assessed and its implications in breeding for resistance to Pseudocercospora griseola are discussed. Reaction of 144 common bean lines to P. griseola was evaluated. Three different experiments were conducted in the greenhouse (V2 and V3 stages) and in the field. Common bean lines were inoculated with a mixture of spores of pathogen races 63-63 and 63-23. We observed that 31 %, 7 % and 10 % of lines were resistant in stages V2, V3 and in the field, respectively. Estimates of coincidence index...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phaseolus vulgaris L.; Pseudocercospora griseola; Genetic resistance; Artificial inoculation.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162019001500415

Virus interference on local scale viticulture: the case of Moll variety from Majorca (Spain)
Provedor de dados: 63
Autores: Cretazzo,Enrico; Padilla,Carlos; Bota,Josefina; Rosselló,Joan; Vadell,Jaume; Cifre,Josep.
In Europe, many autochthonous grapevines (Vitis vinifera L.) are only cultivated at local scale, but play a very important economic role due to their strict relation with terroir and wine tipicity. In this study, it was pursued to evaluate the influence of several factors on performance of Moll, the main autochthonous white variety of Majorca, by means of the database coming from a clonal preselection. The effects of multiple virus infections, vintage and vineyard components were studied by univariate linear models and principal component analysis, starting from measurement of production and must quality parameters of several vines located in 14 vineyards belonging to two appellations during four consecutive years (2001-2004). Absence of multiple virus...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Virus effects; Autochthonous varieties; Soil components; Vintage; Clonal preselection.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162013000200010

Digestive and functional properties of a partially hydrolyzed cassava solid waste with high insoluble fiber concentration
Provedor de dados: 63
Autores: Raupp,Dorivaldo da Silva; Rosa,Danielle Amorim; Marques,Silvia Helena de Paula; Banzatto,David Ariovaldo.
Starch factories generate large amounts of cassava solid waste. A small amount is utilized for animal feed but most of it is discharged with deleterious effects to the envirounment. A edible food with a high content of insoluble dietary fiber (60.9%), named "partially hidrolyzed cassava waste" (PHCW), was prepared from industrial cassava solid waste by an enzymatic process. PHCW or wheat bran (WB) were fed to model rats and both promoted digestive function effects, but PHCW produced the greatest effect. The insoluble fiber constituent from PHCW (and not the soluble fiber), promoted the greatest fecal bulking, fecal weight and defecation frequency in rats, as compared to WB. Such results indicate that the partially hydrolyzed cassava waste presents...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cassava; Dietary fiber; Wheat bran; Functional food; Human nutrition.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000300008

Mulch materials in processing tomato: a multivariate approach
Provedor de dados: 63
Autores: Moreno,Marta María; Moreno,Carmen; Tarquis,Ana María.
Mulch materials of different origins have been introduced into the agricultural sector in recent years alternatively to the standard polyethylene due to its environmental impact. This study aimed to evaluate the multivariate response of mulch materials over three consecutive years in a processing tomato (Solanum lycopersicon L.) crop in Central Spain. Two biodegradable plastic mulches (BD1, BD2), one oxo-biodegradable material (OB), two types of paper (PP1, PP2), and one barley straw cover (BS) were compared using two control treatments (standard black polyethylene [PE] and manual weed control [MW]). A total of 17 variables relating to yield, fruit quality, and weed control were investigated. Several multivariate statistical techniques were applied,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mulching; Principal component analysis; Cluster analysis; Discriminant analysis.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162013000400005

Identification of patterns for increasing production with decision trees in sugarcane mill data
Provedor de dados: 63
Autores: Peloia,Paulo Rodrigues; Bocca,Felipe Ferreira; Rodrigues,Luiz Henrique Antunes.
ABSTRACT: Sugarcane mills in Brazil collect a vast amount of data relating to production on an annual basis. The analysis of this type of database is complex, especially when factors relating to varieties, climate, detailed management techniques, and edaphic conditions are taken into account. The aim of this paper was to perform a decision tree analysis of a detailed database from a production unit and to evaluate the actionable patterns found in terms of their usefulness for increasing production. The decision tree revealed interpretable patterns relating to sugarcane yield (R2 = 0.617), certain of which were actionable and had been previously studied and reported in the literature. Based on two actionable patterns relating to soil chemistry, intervention...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Data mining; Yield variability; Regression tree; Knowledge discovery.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162019001400281

Variabilidade entre isolados de Trichoderma harzianum: I - Aspectos citológicos
Provedor de dados: 63
Autores: Peres,E.; Melo,I.S. De.
Objetivou-se neste trabalho estudar a variabilidade de isolados selvagens de Trichoderma harzianum baseado nas características culturais e citológicas. Observaram-se o tamanho dos fialosporos, número de núcleos por fialosporos e crescimento e esporulação em meio de malte-ágar. Pelos resultados aqui encontrados foi possível reconhecer que há variação entre os isolados selvagens da espécie T. harzianum. Com relação ao número de núcleos, verificou-se uma variação de 1 a 3 núcleos por fialosporos. Também observou-se padrões diferenciais de crescimento e morfologia da colônia. Mais de 50% dos isolados atingiram o máximo de crescimento em 48 horas.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Trichoderma harzianum; Citologia; Variabilidade.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000100010

Soil CO2 emission of sugarcane fields as affected by topography
Provedor de dados: 63
Autores: Brito,Liziane de Figueiredo; Marques Júnior,José; Pereira,Gener Tadeu; Souza,Zigomar Menezes; La Scala Júnior,Newton.
The spatial and temporal variation of soil CO2 emission is influenced by several soil attributes related to CO2 production and its diffusion in the soil. However, few studies aiming to understand the effect of topography on the variability of CO2 emissions exist, especially for cropping areas of tropical regions. The objective of this study was to evaluate the spatial and temporal changes of soil CO2 emission and its relation to soil attributes in an area currently cropped with sugarcane under different relief forms and slope positions. Mean CO2 emissions in the studied period (seven months) varied between 0.23 and 0.71, 0.27 and 0.90, and 0.31 and 0.80 g m-2 h-1 of CO2 for concave (Conc), backslope (BackS) and footslope (FootS) positions, respectively....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil respiration; Temporal variation; Spatial variation; Soil attributes; Soil porosity.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000100011

Rooting performance from leaf petioles of accessions and hybrids of wild Arachis species
Provedor de dados: 63
Autores: Fávero,Alessandra Pereira; Nass,Luciano Lourenço; Cargnin,Adeliano; Leonardecz Neto,Eduardo.
The genus Arachis has 69 species, the majority native to Brazil. Arachis spp. seedling root tips have been used to obtain dividing cells for cytological preparations. Several wild species produce small amounts of seeds and consequently few root meristems, making the cytogenetic characterization very difficult. The purpose of this study was to evaluate the rooting capacity of several wild species of Arachis using the detached leaves technique for obtaining roots from petioles. One hundred and thirty accessions and 27 interspecific hybrids were studied. Three evaluations were performed at 15, 31, and 49 days after planting. Leaf rooting observed in the wild species confirmed the great genetic variability typical of the Arachis genus, indicating that the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cytology; Germplasm.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000100012

Soil quality indicators under management systems in a Quilombola community in the Brazilian Cerrado
Provedor de dados: 63
Autores: Silva,Antonio Marcos Miranda; Ramos,Maria Lucrecia Gerosa; Nascimento,Robervone Severina de Melo Pereira do; Silva,Alberto do Nascimento; Silva,Stefany Braz; Cardoso,Elke Jurandy Bran Nogueira; Paula,Alessandra Monteiro de.
ABSTRACT: Soil management systems exert different effects on soil attributes, especially on the organic matter content, and, consequently, the soil aggregation. The aim of this study was to evaluate the impact of different land uses practiced by quilombola family farmers on water stable aggregates, glomalin and organic carbon in soil aggregates. Soil samples were collected at depths of 0-10 and 10-20 cm from areas cultivated under the following management systems: 1) conventional corn plantation (MA), 2) cultivation of citrus trees intercropped with annual crops (AC) (a conservationist approach), 3) pasture of Brachiaria (Urochloa spp.) (PA), and, as reference, an area of the Cerrado (CR) free of any anthropogenic interference. The studied areas were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Rhodic Hapludox; Water-stable aggregates; Soil protein; Quilombo.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162019001600518

Níveis críticos de fósforo para o estabelecimento de gramíneas forrageiras em Latossolo Vermelho Amarelo, álico: II. Experimento de campo
Provedor de dados: 63
Autores: Corrêa,L. de A.; Haag,H.P.
O estudo teve por objetivos determinar os níveis críticos de P no solo, pelos extratores de Mehlich I e Resina, e na planta, para o estabelecimento das gramíneas Brachiaria decumbens Stapf., Brachiaria brizantha (Hochst.) Stapf. cv. Marandu e Panicum maximum Jacq., em Latossolo Vermelho Amarelo, álico. O delineamento experimental foi o de blocos casualizados com quatro repetições, no esquema fatorial 7 (doses de P) x 3 (gramíneas). As doses de P corresponderam a 0, 20, 40, 80, 160, 320 e 640 kg de P(2)0(5)/ha. Foram realizados dois cortes, o primeiro, 80 dias após a semeadura, e o segundo com 60 dias de rebrota. Diferenças de exigência em P para o estabelecimento das forrageiras, foram bem evidentes entre as três espécies. Os níveis críticos de P no solo,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: P no solo; P na planta; Adubação fosfatada; Gramínea forrageira.
Ano: 1993
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161993000100015

Genetic diversity assessed by microsatellite markers in sweet corn cultivars
Provedor de dados: 63
Autores: Lopes,Ana Daniela; Scapim,Carlos Alberto; Machado,Maria de Fátima Pires da Silva; Mangolin,Claudete Aparecida; Silva,Tereza Aparecida; Cantagali,Liriana Belizário; Teixeira,Flávia França; Mora,Freddy.
Information on genetic diversity is essential to the characterization and utilization of germplasm. The genetic diversity of twenty-two sweet corn cultivars (seventeen open-pollinated varieties, OPV, and five hybrids, H) was investigated by applying simple sequence repeat markers. A total of 257 primers were tested, of which 160 were found to be usable in terms of high reproducibility for all the samples tested; 45 were polymorphic loci, of which 30 were used to assess the genetic diversity of sweet corn cultivars. We detected a total of 86 alleles using 30 microsatellite primers. The mean polymorphism was 82 %. The highest heterozygosity values (Ho = 0.20) were found in the PR030-Doce Flor da Serra and BR427 III OPVs, whereas the lowest values (0.14) were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Simple sequence repeats; Neighbor-joining; Maize germplasm.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162015000600513

Geomorphometric tool associated with soil types and properties spatial variability at watersheds under tropical conditions
Provedor de dados: 63
Autores: Silva,Sérgio Henrique Godinho; Menezes,Michele Duarte de; Mello,Carlos Rogério de; Góes,Helen Thaís Pereira de; Owens,Phillip Ray; Curi,Nilton.
ABSTRACT The application of quantitative methods to digital soil and geomorphological mapping is becoming an increasing trend. One of these methods, Geomorphons, was developed to identify the ten most common landforms based on digital elevation models. This study aimed to make a quantitative assessment of the relationships between Geomorphons units, determined at three spatial resolutions and nine radii, and soil types and properties of two watersheds with different soil-landscape relationships in Brazil to help soil surveying and mapping under tropical conditions. The study was conducted at Lavrinha Creek (LCW) and Marcela Creek (MCW) watersheds, located in the state of Minas Gerais, Brazil. Spatial resolutions of 10, 20 and 30 m were the basis for...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Geomorphons; Soil-landscape relationships; Pedology; Landforms; Digital soil mapping.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000400363

Quantitative genetics theory for genomic selection and efficiency of breeding value prediction in open-pollinated populations
Provedor de dados: 63
Autores: Viana,José Marcelo Soriano; Piepho,Hans-Peter; Silva,Fabyano Fonseca e.
ABSTRACT To date, the quantitative genetics theory for genomic selection has focused mainly on the relationship between marker and additive variances assuming one marker and one quantitative trait locus (QTL). This study extends the quantitative genetics theory to genomic selection in order to prove that prediction of breeding values based on thousands of single nucleotide polymorphisms (SNPs) depends on linkage disequilibrium (LD) between markers and QTLs, assuming dominance. We also assessed the efficiency of genomic selection in relation to phenotypic selection, assuming mass selection in an open-pollinated population, all QTLs of lower effect, and reduced sample size, based on simulated data. We show that the average effect of a SNP substitution is...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Genome-wide selection; Additive value prediction; Prediction accuracy.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000300243

Host colonization differences between citrus and coffee isolates of Xylella fastidiosa in reciprocal inoculation
Provedor de dados: 63
Autores: Prado,Simone de Souza; Lopes,João Roberto Spotti; Demétrio,Clarice Garcia Borges; Borgatto,Adriano Ferreti; Almeida,Rodrigo Piacentini Paes de.
Citrus variegated chlorosis (CVC) and coffee stem atrophy (CSA) are important diseases in Brazil associated with closely-related strains of Xylella fastidiosa, but little is know about host aoverlappingnd importance of citrus and coffee as inoculum sources of these strains. In this study, reciprocal-inoculation experiments were performed to determine if CVC and CSA isolates are biologically similar within citrus and coffee plants. These two hosts were mechanically inoculated with a CVC and a CSA isolate of X. fastidiosa at four concentrations ranging between10³ and 10(9) colony forming units CFU mL-1. At two, four and eight months after inoculation, the infection efficiency and bacterial populations of the isolates in each host were determined by...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Citrus variegated chlorosis; Coffee leaf scorch; Inoculum concentration; Bacterial population; Epidemiology.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000300005

INFLUÊNCIA DO CULTIVO CONSORCIADO DE AVEIA PRETA (AVENA STRIGOSA SCHIEB.) E ERVILHACA COMUM (VICIA SATIVA L.) NA PRODUÇÃO DE FITOMASSA E NO APORTE DE NITROGÊNIO
Provedor de dados: 63
Autores: Heinrichs,R.; Fancelli,A.L.
Em um Podzólico Vermelho Amarelo e sob preparo convencional, foi avaliada a influência de proporções de sementes de ervilhaca (Vicia sativa L.) e de aveia preta (Avena strigosa Schieb.) cultivadas em consórcio, na produção de fitomassa e no aporte de nitrogênio no sistema. O experimento foi implantado em solo podzolico vermelho amarelo, de Santa Maria, RS. Os tratamentos foram casualizados em quatro blocos, constituindo-se de: 1- 100% Ervilhaca comum (E); 2- 90% E + 10% Aveia preta (A); 3- 75% E + 25% A; 4- 50% E + 50% A; 5- 25% E + 75% A; 6- 100% A; 7- pousio de inverno. A amostragem da fitomassa das coberturas verdes foi efetuada na ocasião do pleno florescimento em área de 0,8m2 por parcela. Os resultados evidenciaram que a aveia preta e a ervilhaca...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Consorciação; Espécies de inverno; Adubação verde; Nitrogênio.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000100005

Calcium, potassium and magnesium treatment of Chrysanthemum morifolium cv. "Bi Time" and callogenesis in vitro
Provedor de dados: 63
Autores: Borgatto,Fábio; Dias,Carlos Tadeu dos Santos; Amaral,Antônio Francisco Campos; Melo,Murilo.
The chemical composition and vegetative vigor of the donor plant are essential for the satisfactory performance of explants in vitro. In order to test the effect of potassium, calcium and magnesium nutritional status of Chrysanthemum morifolium plants on callogenesis in vitro, pot plants growing in sand were irrigated with nutrient solution containing different levels of potassium (0; 58.5; 117 and 234 mg L-1), calcium (0; 50; 100 e 200 mg L-1) and magnesium (0;12; 48 e 96 mg L-1). After 30 and 45 days, explants (shoot segments and leaf discs) were collected, desinfected and inoculated on MS solid medium supplemented with 0.1 mg L-1 of kinetin and 5.0 mg L-1 of nafthalene acetic acid for callogenesis induction. Callogenesis evaluated as callus fresh weight...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Matrix plant; Mineral nutrition; Tissue culture.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000400011

Interspecific xenia and metaxenia in seeds and fruits of tomato
Provedor de dados: 63
Autores: Piotto,Fernando Angelo; Batagin-Piotto,Katherine Derlene; Almeida,Marcílio de; Oliveira,Giancarlo Conde Xavier.
Xenia, the transmission of traits from the pollinizer to the female's tissues, is a phenomenon hitherto unknown in tomatoes. Here, we describe xenia effects on the seeds and fruits of Solanum lycopersicum, the tomato, elicited by S. galapagense. The wild tomatoes, such as S. galapagense, have highly pilose fruit surface and minute seeds, unlike the domesticated species. Crossings between S. galapagense (pollinizer) and two large-seeded, glabrous cultivars of S. lycopersicum (females) tested the former's ability to raise the trichome density and trichome-to-1000-cell ratio and to reduce the seed weight in the latter's fruits. Selfed fruits of the two cultivars, Micro-Tom and Pusa Ruby, were compared to the crossed fruits. The pollen of S. galapagense was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hormones; Pollination; Microscopy; Wild relative.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162013000200007

Coincidence of flowering time and the productivity and quality of cauliflower hybrid seeds
Provedor de dados: 63
Autores: Verdial,Marcelo Fontanetti; Cardoso,Antonio Ismael Inácio; Lima,Márcio Santos de; Chaves,Francisco Célio Maia.
The missing of flowering synchronization between the self-incompatible lines in a crop field of cauliflower hybrid seeds besides making the seed production smaller can compromise the genetic purity of them. The coincidence of the flowering time between two cauliflower lines was examined to study its effect on the productivity and quality of hybrid seeds. The treatments consisted of six different sowing dates, every fifteen days, using a self-incompatible tropical line pollinated by a winter line which does not present self-incompatibility. The following characteristics were evaluated: leaf average area and number of flowers per plant, number of siliques per plant, number and weight of seeds per plant, weight of thousand seeds and average number of seeds...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brassica oleracea; Seed; Hybrid; Self-incompatibility.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000300015

Estimation of papaya leaf area using the central vein length
Provedor de dados: 63
Autores: Campostrini,Eliemar; Yamanishi,Osvaldo Kiyoshi.
Four genotypes of papaya (Carica papaya L.) two from the 'Solo' group (Sunrise Solo and Improved Sunrise Solo line 72/12) and two from the 'Formosa' group (Tainung 02 and Known-You 01), grown in Macaé, RJ, Brazil (lat. 22(0) 24' S, long. 41(0) 42' W), were used in this study. Twenty-five mature leaves from each genotype were sampled four and five months after seedling transplant to the field to determine the length of the leaf central vein (LLCV) and the leaf area (LA). According to covariance analyses there were no significant differences in the slope and intercept of the mathematical models calculated for each genotype. Thus, a single mathematical model (Log LA = 0.315 + 1.85 Log LLCV, R²=0.898) was adjusted to estimate the LA using the length of LLCV...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Carica papaya; Mathematical model; Genotypes.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000100007

Chemical treatment to unclogg dripper irrigation systems due to biological problems
Provedor de dados: 63
Autores: Ribeiro,Túlio Assunção Pires; Paterniani,José Euclides Stipp; Coletti,Christiane.
Many producers use drippers for trickle irrigation systems for flower production in the field and in protected environments. A frequent problem in this type of irrigation system is the clogging of drippers, which is directly related to water quality and filtering system efficiency. The objective of this study was to conduct an experimental investigation to evaluate the efficiency of using nitric acid and sodium hypochlorite to unclogg drippers due to the use of water with high algae content. The evaluation was conducted in six, 4216 m² greenhouses, each with two sectors comprised of ten spaces or lines, totaling 12 sectors of a dripper irrigation system in a rose producing property of Holambra, State of SP, Brazil. Chemical and physical analyses and the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Trickle irrigation; Uniformity evaluation; Chlorinate; Water quality.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000100001

Breeding common bean populations for traits using selection index
Provedor de dados: 63
Autores: Lima,Dayane Cristina; Abreu,Ângela de Fátima Barbosa; Ferreira,Ricardo Augusto Diniz Cabral; Ramalho,Magno Antonio Patto.
A common bean (Phaseolus vulgarisL.) cultivar must combine desirable genotypes for several traits in order to be accepted by producers and consumers. This study aimed to evaluate selection efficiency when segregating bean populations for traits, by means of a selection index, in order to obtain superior progenies for traits considered. A total of 16 populations from the F4 and F5generations were evaluated in 2011 and 2012, respectively. The traits evaluated were plant architecture, plant disease, grain type and yield. Using standard scores (Z), the sum of the four traits (∑Z) was obtained and, based on this information, the best populations were identified. The evaluation of selection effectiveness was performed on 31 progenies from each population. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Plant architecture; Plant disease; Grain yield.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162015000200132

VALIDAÇÃO DE TÉCNICAS EXPERIMENTAIS PARA AVALIAÇÃO DE CARACTERÍSTICAS AGRONÔMICAS E ECOLÓGICAS DE PASTAGENS DE CYNODON DACTYLON CV. 'COASTCROSS-1
Provedor de dados: 63
Autores: Carnevalli,Roberta Aparecida; Silva,Sila Carneiro da.
Este trabalho consiste na avaliação de uma pastagem tropical Cynodon dactylon, enfocando, principalmente necessidade de adaptação, aferição da precisão e transferência de metodologias comumente utilizadas para plantas de clima temperado. Neste estudo, pôde-se avaliar produção de forragem, composição botânica, crescimento por perfilho e senescência foliar (fluxo e renovação de tecidos) e dinâmica populacional de perfilhos (morte, sobrevivência e aparecimento de perfilhos), relacionada com a densidade de perfilhos (números de perfilhos/m2), possibilitando a detecção de falhas e imprecisões nestes métodos quando transferidos de forma direta de comunidades de plantas de clima temperado para plantas de clima tropical. Foram geradas, ainda, equações de...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cynodon; Produção de forragem; Perfilhamento; Fluxo de tecidos.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000200032

Seed size-number trade-off in Euterpe edulis in plant communities of the Atlantic Forest
Provedor de dados: 63
Autores: Brancalion,Pedro Henrique Santin; Rodrigues,Ricardo Ribeiro.
Investigations of seed size and number differences among plant populations growing in contrasting habitats can provide relevant information about ecological strategies that optimize reproductive effort. This may imply important consequences for biodiversity conservation and restoration. Therefore, we sought to investigate seed size-number trade-off in Euterpe edulis populations growing in plant communities in the Brazilian Atlantic Forest. Seed dry mass and seed number per bunch were evaluated in 2008 and 2009 in large remnants of the Seasonally Dry Forest, Restinga Forest and Atlantic Rainforest in southeastern Brazil, in 20 individuals per site and year. Seed size and seed number varied among forest types, but a seed size-number trade-off was neither...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Seed ecology; Seed dispersal; Seed size optimization; Plant reproductive effort; Seedling establishment.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162014000300007

Energy embodiment in Brazilian agriculture: an overview of 23 crops
Provedor de dados: 63
Autores: Veiga,João Paulo Soto; Romanelli,Thiago Libório; Gimenez,Leandro Maria; Busato,Patrizia; Milan,Marcos.
The amount of energy required to produce a commodity or to supply a service varies from one production system to another and consequently giving rise to differing levels of environmental efficiency. Moreover, since energy prices have been continuously increasing over time, this energy amount may be a factor that has economic worth. Biomass production has a variety of end-products such as food, energy, and fiber; thus, taking into account the similarity in end-product of different crops (e.g.: sunflower, peanuts, or soybean for oil) it is possible to evaluate which crops require less energy per functional unit, such as starch, oil, and protein. This information can be used in decision-making about policies for food safety or bioenergy. In this study, 23...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: EROI; Starch; Oil; Fertilizer; Fiber; Energy balance.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162015000600471

Adaptação do método contínuo de secagem para sementes de arroz
Provedor de dados: 63
Autores: Motta,Walter Araujo; Villela,Francisco Amaral; Zimmer,Gilberto Jaime.
Com o objetivo de avaliar a influência da adaptação do método contínuo de secagem sobre a qualidade das sementes de arroz durante o armazenamento, quatro porções de sementes, pesando cada uma 2500 kg, foram secadas em secador de fluxo contínuo Kepler Weber, modelo KW-2, utilizando diferentes temperaturas do ar, respectivamente, nas câmaras de secagem, superior e inferior: 60/40ºC; 60/50ºC; 70/50º C; 70/60ºC e um tratamento testemunha, constituído por quatro amostras submetidas à secagem estacionária em estufa regulada à temperatura constante de 32ºC. A qualidade das sementes foi avaliada através dos seguintes testes: grau de umidade, germinação, envelhecimento artificial e emergência em campo, conduzidos em quatro épocas, correspondentes aos 0, 60, 120 e...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Oryza sativa; Secagem; Semente; Qualidade; Armazenamento.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000500002

Different yellowing degrees and the industrial utilization of flue-cured tobacco leaves
Provedor de dados: 63
Autores: Zou,Congming; Hu,Xiaodong; Huang,Wei; Zhao,Gaokun; Yang,Xuebiao; Jin,Yan; Gu,Huaguo; Yan,Fei; Li,Yan; Wu,Qun; Xiong,Kaisheng.
ABSTRACT: Yellowing is a key stage in the curing of flue-cured tobacco (Nicotiana tobacum L.) as much of the chemical transformation occurs during this period. This study examined the effect of different yellowing degrees on the value of flue-cured tobacco leaves at the farm level for both processing and manufacturing. The study was conducted in the counties of Chuxiong, Dali, and Yuxi in Yunnan, China over two years. Yellowing treatments have been designed to have either a mild or a regular yellowing degree. Yield, value, appearance, suction property, smoking characteristics, and physical resistance to further processing were investigated to evaluate the effect of degree of yellowing on the industrial utilization of flue-cured tobacco leaves. The regular...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hongda cultivar; K326 cultivar; Curing barn; Re-drying; Leaf utility.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162019000100001

Performance and milk quality of cows fed triticale silage or intercropped with oats or legumes
Provedor de dados: 63
Autores: Bumbieris Junior,Valter Harry; Emile,Jean-Claude; Jobim,Clóves Cabreira; Rossi,Robson Marcelo; Horst,Egon Henrique; Novak,Sandra.
ABSTRACT: The use of intercropped grass legumes provides a source of sustainable animal production as these vegetables contribute to an increase in forage yield by area, and substitute inorganic nitrogen and other components. The objective of this study was to evaluate the nutritional characteristics of silages and the yield and milk quality of Holstein cows fed triticale silages in monoculture or intercropped with either oats or legumes. The crops for silage production were triticale (TS), triticale in consortium with forage pea (TSP), and triticale in consortium with oats, forage peas and vetches (TSOPV). The silages showed no differences in dry matter content. The highest crude protein (13.06 %) and ethereal extract content was observed in TSOPV, but in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Forage; Forage pea; Grass; Nutritional value; Vetch.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000200402

Genetic variability for carotenoid content of grains in a composite maize population
Provedor de dados: 63
Autores: Kist,Volmir; Albino,Vanessa Stainbach; Maraschin,Marcelo; Ogliari,Juliana Bernardi.
Local maize (Zea mays L.) varieties are cultivated by small-scale farmers in western Santa Catarina (SC) State, in southern Brazil. These small areas frequently present many problems related to biotic and non-biotic stresses, which have limited the economic output and income of the farmers. Production from local varieties for human consumption would be an alternative way of improving income and stimulating on farm conservation. The genetic variability of the total carotenoid content (TCC) of kernels in a local maize population was evaluated for their economic exploitation potential as biofortified food. Two independent samples of 96 half-sib families (HSF) plus four checks were evaluated in two groups of experiments in western SC and each one was carried...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biofortified food; Convergent-divergent selection; Genetic-statistical parameters; Genotype by environment interaction.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162014000600006

Cana-de-açúcar cultivada após milho e amendoim, com diferentes doses de adubo
Provedor de dados: 63
Autores: Alleoni,L.R.F.; Beauclair,E.G.F. de.
Numa areia quartzosa álica de Piracicaba,SP foram avaliados diversos parâmetros de crescimento e a produtividade da cana-de-açúcar, variedade SP 70-1143, cultivada no espaçamento 0,9 m entrelinhas, em rotação com milho e com amendoim. Independentemente da dose de adubo utilizada no plantio (500 kg/ha - 45 g/m ou 778 kg/ha - 70 g/m de 05-25-25), a produtividade da cana aos 18 meses, após o cultivo do amendoim, foi superior à produtividade após milho. Na rotação com amendoim não houve efeito da dose de adubo em nenhum dos parâmetros avaliados (número de perfilhos/10 m, altura da cana, peso de 30 colmos e quilômetros de cana/ ha). Entretanto, nas áreas após o cultivo do milho, o número de perfilhos do tratamento com a dose maior de adubo foi igual ao dos...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cana-de-açúcar; Rotação de culturas; Parâmetros de crescimento.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000300001

Quantidades de solução de nitrato de potássio e a germinação de sementes de Panicum maximum Jacq.
Provedor de dados: 63
Autores: Toledo,F.F. de; Novembre,A.D.L.C.; Chamma,H.M.C.P.
Realizou-se o presente trabalho com o objetivo de estudar a germinação de sementes de cultivares de Panicum maximum Jacq. (Colonião, Tobiatã, Centenário, Centauro e Tanzânia), em testes sobre substratos umedecidos com três quantidades de solução de nitrato de potássio a 0,2%, quais sejam: 12, 16 e 20 ml. Depois de semeados, os gerboxes foram fechados com fita crepe e levados para germinador. As contagens de germinação foram realizadas de 7 em 7 dias, sem se acrescentar água, e os gerboxes mantidos vedados. Os resultados permitiram concluir que houve diferença entre os testes, dependendo da quantidade de solução utilizada, tendo a germinação com 12ml superado a das demais.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Panicum sp.; Germinação; Quantidades de KNO3.
Ano: 1994
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000300010

Moisture content evaluation of biomass using CFD approach
Provedor de dados: 63
Autores: Bartzanas,Thomas; Bochtis,Dionysis D.; Sørensen,Claus G.; Green,Ole.
In grass conservation systems, drying in the field is an essential process upon which the quality and quantity of the material to be conserved is dependent on. In this study a Computational Fluid Dynamics (CFD) model, previously validated, was used to assess qualitatively and quantitatively the field drying process of cut grass under different weather conditions and structural specifications of the grass. The use of the CFD model depicts the climate heterogeneity in the grass area with a special focus on moisture distribution, influence of the weather conditions, in order to create the possibility of applying the model as a decision support tool for an enhanced treatment of the grass after cutting.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Evaporation; Heterogeneity; Forage.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162012000500001

Sources and rates of potassium for sweet orange production
Provedor de dados: 63
Autores: Quaggio,José Antonio; Mattos Junior,Dirceu; Boaretto,Rodrigo Marcelli.
Fruit yield and quality of citrus trees (Citrus spp.) is markedly affected by potassium (K) fertilization. Potassium chloride is the major source of K, even though other sources are also available for agricultural use when crops are sensitive to chloride or where potential for accumulation of salts in soils exists. Only few studies addressed the effect of K sources on yield and quality of citrus fruits. Therefore, the present study was conducted to evaluate K2SO4 and KCl fertilizer sources at 0, 100, 200, and 300 kg ha-1 per year K2O on fruit yield and quality of 'Pêra' and 'Valencia' sweet orange trees in the field. The experiments were carried out in a 4 × 2 factorial design under randomized complete blocks, with four replicates from 2001 to 2004. Fruit...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Citrus sinensis (L.) Osbeck; Chloride; Sulfate; Mineral nutrition; Nutrient management.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000300015

Simulation model for particle dynamics in rumen of cattle fed sugarcane diet
Provedor de dados: 63
Autores: Collao-Saenz,Edgar Alain; Dijkstra,Jan; Paiva,Paulo César de Aguiar; Bannink,André; Arcuri,Pedro Braga; Teixeira,Júlio César; Olalquiaga Pérez,Juan Ramón; David,Flávia Maria.
Animal simulation models are sets of equations used to describe biological processes. A non-steady state simulation model of cattle digestion is presented in order to represent nutrient availability as a response to feed intake pattern and the kinetics of particle size reduction. Variables representing the particle size reduction and discontinuous voluntary feed intake were included in a mechanistic model created to optimize the supplementation of sugarcane based diets. In general the predicted values were very close to observed values for fibre and nitrogen flows. The model has not shown consistent bias in relation to the behavior of the observed data of duodenal flow of neutral detergent fiber and non-ammonia nitrogen. Milk production simulations were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dairy cows; Milk production; Modeling; Rumen.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000200002

Molecular fingerprinting of Fusarium oxysporum f. sp. passiflorae isolates using AFLP markers
Provedor de dados: 63
Autores: Silva,Aline dos Santos; Oliveira,Eder Jorge de; Haddad,Fernando; Jesus,Onildo Nunes de; Oliveira,Saulo Alves Santos de; Costa,Maria Angélica Pereira de Carvalho.
Fusarium oxysporum f. sp. passiflorae W.L. Gordon (FOP) is one of the most important fungal pathogens of passion fruits. Understanding molecular variation of isolates from different areas is of utmost importance. Molecular fingerprinting on 14 isolates of FOP were conducted using AFLP molecular markers (Amplified Fragment Length Polymorphism), and their genetic variability were estimated. Twenty-five AFLP primer combinations were selected for amplification of FOP isolates and one for Fusarium oxysporum f. sp. cubense W.C. Snyder &amp;amp; H.N. Hansen (FOC), resulting in 99% polymorphic fragments, with an average of 40 fragments per primer combination. Specific fingerprints could be generated for most of the isolates evaluated; we observed a high power of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Passion fruit; Fusarium wilt; Fingerprint; Variability; Molecular marker.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162013000200008

Grapevine leaf water potential based upon near infrared spectroscopy
Provedor de dados: 63
Autores: Santos,Antonio Odair; Kaye,Oren.
Leaf water potential is a measure commonly used to describe crop water status and water stress dynamics. The established method for determining leaf water potential using a pressure chamber is cumbersome and subject to operator error as well as time/temperature limitations. These limitations prohibit the intensive sampling required to support proactive water management of commercial crops, including vineyards. Particular for grapevines there is need for faster, more precise and more reliable tools for determining leaf water potential in the field. Portable Near-infrared spectroscopy and multivariate data analysis were applied for the modeling and prediction of leaf water potential in grapevines. For field-grown wine grapes the most significant and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: PLS; Irrigation; Spectrometry; Chemometrics.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000300001

Relationship between germination and bell pepper seed structure assessed by the X-ray test
Provedor de dados: 63
Autores: Gagliardi,Bruna; Marcos-Filho,Julio.
Alternative use of the X-ray test to evaluate seed quality has become increasingly diverse. This study was performed primarily to establish experimental procedures and verify the effectiveness of the X-ray test to detect damage or abnormalities in bell pepper (Capsicum annuum) seed structure associated with germination. Five seed lots each of hybrids Reinger and Sentinel were used. Two hundred seeds per lot were exposed to durations and intensities of X-radiation and visually classified into four categories according to the proportion between the area occupied by the embryo and endosperm in relation to the total cavity area in the internal seed structure, e.g. 0, &lt; 50%, 50-75% and 100%. The last category was subdivided into two others based on the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Seed analysis; Embryo morphology; Physical integrity.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000400004

Transpiration rate response to water deficit during vegetative and reproductive phases of upland rice cultivars
Provedor de dados: 63
Autores: Heinemann,Alexandre Bryan; Stone,Luís Fernando; Fageria,Nand Kumar.
Water deficit is one of the most important abiotic stress limiting upland rice yield in the "Cerrado" region of Brazil. Selecting drought tolerant cultivars is an important strategy to overcome this constraint. Two greenhouse experiments were conducted at Santo Antônio de Goiás, state of Goiás, Brazil, to compare the response of normalized transpiration rate (NTR) of three modern (BRS Primavera, BRSMG Curinga and BRS Soberana) and one traditional (Douradão) upland rice cultivars to soil water deficit during the vegetative and reproductive growth stages. This information will support breeding strategies to improve rice yield in a drought-prone target population environments (TPE) in Brazil. NTR and the total fraction of transpirable soil water (FTSW) were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Oryza sativa; Available soil water; Dry spells; Fraction of soil water transpiration.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000100004

Impact of global warming on beef cattle production cost in Brazil
Provedor de dados: 63
Autores: Nääs,Irenilza de Alencar; Romanini,Carlos Eduardo Bites; Salgado,Douglas D'Alessandro; Lima,Karla Andrea Oliveira; Vale,Marcos Martinez do; Labigalini,Marcelo Ricardo; Souza,Silvia Regina Lucas de; Menezes,Adriana Gomes; Moura,Daniella Jorge de.
Global warming is affecting agribusiness in its economic aspects. Therefore, the prediction of the evolution of Brazilian beef cattle production cost was made using the IPCC forecast scenario for global warming. The methodology consisted of two steps: (i) the development of a fuzzy model that estimated the grazing land capacity (RP) decrease risk as a function of the changes in the average total rain index, air temperature and increase in extension of the dry season; and (ii) the design of an algorithm for predicting the decrease in production as function of the RPfuzzy model, that results in the impact in beef cattle productivity, and consequent increase in production costs. Historical environmental data from important producing counties in the Cerrado...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dry season; Environmental temperature; Fuzzy simulation; Mathematical modeling.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000100001

Reclamation status of a degraded pasture based on soil health indicators
Provedor de dados: 63
Autores: Santos,Cristiane Alcantara dos; Krawulski,Cristina Célia; Bini,Daniel; Goulart Filho,Tadeu; Knob,Adriana; Medina,Cristiane Conti; Andrade Filho,Galdino; Nogueira,Marco Antonio.
Pasture degradation is a concern, especially in susceptible sandy soils for which strategies to recover them must be developed. Microbiological and biochemical soil health indicators are useful in the guindace of soil management practices and sustainable soil use. We assessed the success of threePanicum maximum Jacq. cultivars in the reclamation of a pasture in a sandy Typic Acrudox in the northwest of the state of Paraná, Brazil, based on soil health indicators. On a formerly degraded pasture withUrochloa brizantha (Hochst. ex A. Rich.) R.D. Webster, a trial with threeP. maximum (cv. Massai, Tanzânia, or Mombaça) was conducted. Lime and phosphate were applied at set-up, and mineral N and K as topdressing. A remnant of degraded pasture adjacent to the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Microbial biomass; Bio-indicators; Soil enzymes; Soil quality; Reclamation of pastures.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162015000300195

Embalagens plásticas para pêssegos ‘flordaprince’ refrigerados
Provedor de dados: 63
Autores: Kluge,Ricardo Alfredo; Scarpare Filho,João Alexio; Jacomino,Angelo Pedro; Marques,Carolina.
Pêssegos cv. Flordaprince foram armazenados a 1 ± 1oC e 85-90% de umidade relativa, em diferentes tipos de embalagens plásticas, por períodos de 14 e 28 dias. Os tratamentos envolveram o uso de filme de PVC, polietileno de alta densidade, polietileno de baixa densidade e o controle (sem embalagem). As frutas desta cultivar puderam ser armazenadas por 14 dias, enquanto que aos 28 dias houve alta incidência de injúria pelo frio ("lanosidade"). O uso das embalagens plásticas reduziu a perda de peso durante o armazenamento refrigerado. O polietileno de baixa densidade manteve mais alta a firmeza de polpa das frutas durante o período de refrigeração.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Prunus persica; PVC; Polietileno; Injúria.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000400011

Molecular identification of Aspergillus spp. isolated from coffee beans
Provedor de dados: 63
Autores: Magnani,Marciane; Fernandes,Thiago; Prete,Cássio Egidio Cavenaghi; Homechim,Martin; Ono,Elisabete Yurie Sataque; Vilas-Boas,Laurival Antonio; Sartori,Daniele; Furlaneto,Márcia Cristina; Fungaro,Maria Helena Pelegrinelli.
Some species belonging to the genus Aspergillus are potential producers of ochratoxin A (OA), a mycotoxin with nephrotoxic, immunosuppressive, teratogenic and carcinogenic effects. The aim of the present study was to identify the species of Aspergillus that contaminate the inside of coffee beans collected in the stage of maturation and drying, from 16 producing areas located in the northern region of the State of Paraná, in the South of Brazil. A total of 108 isolates of Aspergillus spp. was identified at the species level, by sequencing the internal transcribed spacer (ITS1-5.8S-ITS2) of ribosomal DNA (rDNA). The results revealed the presence of potentially ochratoxigenic species in 82% of the geographic regions studied, among which Aspergillus niger was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: ITS; Ribosomal DNA; Ochratoxin; Mycotoxin.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000100009

Sources of resistance to Crinipellis perniciosa in progenies of cacao accessions collected in the Brazilian Amazon
Provedor de dados: 63
Autores: Paim,Valéria Rodrigues Lavigne de Mello; Luz,Edna Dora Martins Newman; Pires,José Luís; Silva,Stela Dalva Vieira Midlej; Souza,Jorge Teodoro de; Albuquerque,Paulo Sérgio Bevilaqua; Santos Filho,Lindolfo Pereira dos.
The witches' broom disease caused by the fungus Crinipellis perniciosa is the main phytossanitary constraint for cacao production in Brazil. The integrated management of the disease involves resistance as one of the components. The breeding program conducted by the Brazilian Institution, CEPLAC is directed toward the pyramidation of resistance genes from different sources to achieve a more durable resistance. This study aimed to identify sources of resistance in progenies of cacao accessions collected in the basins of ten Amazonian rivers and compared to progenies from the Peruvian clones 'Scavina 6' and 'Sacavina 12'. Progenies from 40 Amazonian accessions and 'Scavina' were evaluated in the field for six years for witches' broom resistance through...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Theobroma cacao; Genetic breeding; Resistance; Witches' broom disease.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000600011

Avaliação de porta-enxertos para pepino tipo japonês
Provedor de dados: 63
Autores: Lima,Márcio Santos; Verdial,Marcelo Fontanetti; Minami,Keigo; Tessarioli Neto,João.
A enxertia de pepino híbrido do tipo japonês em aboboreira tem por objetivo principal o manejo de doenças causadas por fungos de solo, consequentemente obter maior produtividade, além de frutos menos cerosos. Neste trabalho estudou-se o comportamento da cultivar Rensei, avaliando-se o desenvolvimento vegetativo das mudas, a produtividade e as características dos frutos das plantas enxertadas em diferentes porta-enxertos, em comparação com as não enxertadas. O trabalho foi realizado sob estufa do tipo túnel alto, com as plantas conduzidas em recipientes plásticos, de julho/96 a julho/97, em Piracicaba - SP. Os tratamentos foram os seguintes: T1 testemunha (planta não-enxertada); T2 enxertia em abóbora Menina Brasileira; T3 enxertia em abóbora híbrida Ikki;...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Cucumis sativus; Pepino; Abóbora; Enxertia; Muda.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000100027

Meta-análise para estimativas de correlação genética entre pesos ao nascer e desmama de bovinos
Provedor de dados: 63
Autores: Giannotti,Juliana Di Giorgio; Packer,Irineu Umberto; Mercadante,Maria Eugênia Zerlotti.
O problema de combinar informações de estudos independentes atinge quase todos os campos da ciência, devido, principalmente, ao grande número de artigos científicos publicados nos últimos anos, assim sumarizar informações se tornou uma necessidade. Uma meta-análise foi conduzida com o objetivo de resumir as estimativas da correlação genética entre pesos ao nascer e desmama de bovinos de corte de origem zebuína. Foi usado um conjunto de estimativas obtidas em 39 artigos publicados no período de 1968 a 2000. Os dados foram analisados de acordo com modelos fixo e aleatório, este último sob a técnica da máxima verossimilhança restrita. O modelo fixo não foi apropriado em virtude da falta de homogeneidade das estimativas de correlação, sendo portanto...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Correlação genética; Estimativa combinada; Revisão quantitativa.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000300004

Flutuação populacional e intensidade de infestação da broca-dos-frutos em cupuaçu
Provedor de dados: 63
Autores: Thomazini,Marcílio José.
Dentre as pragas do cupuaçueiro Theobroma grandiflorum (Wild. ex Spreng.) Schum., a broca-dos-frutos, Conotrachelus humeropictus Fiedler (Coleoptera: Curculionidae), é a mais importante, devido aos danos causados e por estar disseminada em alguns Estados da região Norte do Brasil. Os objetivos deste trabalho foram avaliar a flutuação populacional de adultos de C. humeropictus, determinar a intensidade de infestação e caracterizar o ataque de larvas desta praga em frutos de cupuaçueiros, em sistemas agroflorestais no Estado de Rondônia. Para obter a flutuação populacional de adultos da broca, foram amostradas semanalmente, durante o período de março/98 a julho/00, 20 plantas de cupuaçu, pelo método do sacolejo, em duas áreas de agrossilvicultores. A...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Conotrachelus humeropictus; Theobroma grandiflorum; Amazônia Ocidental; Sistemas agroflorestais; Inseto-praga.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000300009

Atenuação da radiação gama no estudo da distribuição de partículas em solo sob floresta e cana-de-açúcar
Provedor de dados: 63
Autores: Oliveira,J.C.M. de; Reichardt,K.; Vaz,C.M.P.
É apresentado o uso de uma nova metodologia de análise da distribuição de tamanho de partículas de solo, em amostras de terra sob floresta nativa e submetido ao cultivo de cana-de-açúcar por 16, 30 e 50 anos consecutivos. A técnica para análise granulométrica do solo baseia-se na atenuação de um feixe de radiação gama, por uma suspensão convencional terra/água em sedimentação. Os resultados indicam uma diferença significativa dos teores de argila nas camadas superficiais do solo em função do cultivo com cana-de-açúcar.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Análise granulométrica do solo; Atenuação da radiação gama; Sedimentação; Cultivo do solo.
Ano: 1994
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000300003

INTRODUÇÃO DOS CULTIVARES DE UVA DE MESA "FANTASIA" E "RUIVA" NO BRASIL
Provedor de dados: 63
Autores: Pommer,Celso Valdevino; Terra,Maurilo Monteiro; Pires,Erasmo José Paioli; Passos,Ilene Ribeiro Silva; Martins,Fernando Picarelli.
Fantasia' e `Ruiva' são dois cultivares de uva de mesa desenvolvidos pelo Departamento de Agricultura dos E.U.A., lançadas na Califórnia em 1989 e introduzidos no Brasil, no mesmo ano, pelos autores. No final do inverno de 1991, garfos dos dois cultivares foram enxertados sobre três diferentes porta-enxertos, a saber: Kober 5BB, Ripária do Traviú (106-8 Mgt) e IAC 766 `Campinas', no Centro Experimental de Campinas, do IAC. Garfos também foram distribuídos para alguns viticultores selecionados em diferentes regiões paulistas. Resultados de observações preliminares são apresentados. Para a familiarização pelos viticultores, bem como facilitar a pronúncia em português, os cultivares foram renomeados como sendo `Fantasia' para "Fantasy Seedless" e `Ruiva' para...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Uva de mesa; Uva sem semente; Cultivares; Porta-enxertos; Fenologia.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000100034

Antibiotic resistence of Aeromonas hydrophila isolated from Piaractus mesopotamicus (Holmberg, 1887) and Oreochromis niloticus (Linnaeus, 1758)
Provedor de dados: 63
Autores: Belém-Costa,Andréa; Cyrino,José Eurico Possebon.
One of the most important problems involving treatments with antibiotics against Aeromonas hydrophila isolated from fishes is that antibiotic resistance develops readily. The antimicrobial activity of chemotherapeutants in isolates from pacu Piaractus mesopotamicus (Holmberg, 1887) and tilapia Oreochromis niloticus (Linnaeus, 1758) was tested by the Kirby-Bauer disk method, over Mueller-Hinton surface agar previously inoculated with 100 µL of bacterial suspensions. After regular incubation, isolates from tilapia and pacu were uniformly resistant to amoxicillin, ampicillin, lincomycin, novobiocin, oxacillin, penicillin, and trimetoprim+sulfametoxazole. The A. hydrophila type strain presented resistance to the same antimicrobial substances and also against...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Bacterial isolates; Bacterial strains; Antimicrobial substances; Chemotherapeutants; Drugs.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000300011

ERRATA/ERRATUM
Provedor de dados: 63
Tipo: Info:eu-repo/semantics/report
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000100035

Interaction between resistant tomato genotypes and plant extracts on Bemisia tabaci (Genn.) biotype B
Provedor de dados: 63
Autores: Baldin,Edson Luiz Lopes; Vendramim,José Djair; Lourenção,André Luiz.
The tomato (Lycopersicon spp.) productivity is severely reduced by attack of several insects and microorganisms. It is economically one of the most important crops that has been extensively cultivated in the Americas. Therefore, assays were performed in the greenhouse and the laboratory to evaluate the possible interaction between resistant tomato genotypes and plant extracts on the control of the pest Bemisia tabaci Gennadius (Hemiptera: Aleyrodidae) biotype B. This evaluation was performed for genotypes IAC-Santa Clara, PI-134417, LA-716, PI-134418, and PI-127826, and aqueous extracts from seeds of Azadirachta indica A. de Jussieu (Rutales: Meliaceae), branches and leaves of Trichilia pallida Swartz (Rutales: Meliaceae). In the greenhouse, spraying with...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Aleyrodidae; Silverleaf whitefly; Host plant resistance; Botanical insecticide.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000500004

Half a century of studying adaptability and stability in maize and soybean in Brazil
Provedor de dados: 63
Autores: Rezende,Wender Santos; Cruz,Cosme Damião; Borém,Aluízio; Rosado,Renato Domiciano Silva.
ABSTRACT: The study of adaptability and stability underlies the cultivar recommendation process for all crops. There is a considerable number of statistical methods available for this purpose, but little is known about their actual adoption by the Brazilian scientific community. The objective of this study was to carry out a systematic review of the scientific literature on the adaptability and stability methods used in maize and soybean in Brazil from scientific articles published between 1970 and 2017 in Brazilian journals. Article searches were carried out in journals indexed through the SciELO database. The articles were classified according to the year of publication and the adaptability and stability methods used. We also evaluated the pattern of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays L.; Glycine max (L.) Merril; Genotype × environment interaction; Adaptation; Cultivar recommendation.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000300501

Phytoextraction and fractionation of heavy metals in soil after multiple applications of natural chelants
Provedor de dados: 63
Autores: Melo,Évio Eduardo Chaves de; Nascimento,Clístenes Williams Araújo do; Accioly,Adriana Maria de Aguiar; Santos,Ana Cristiane Queiroz.
Chelate-assisted phytoextraction of heavy metals is a promising approach to clean up polluted soils. However, the most successful chelants tested so far are synthetic agents that barely degrade in soil, increasing the metal leaching risks. Natural organic acids have been proposed to enhance phytoextraction due to their higher biodegradability, but they can also be a drawback for efficient phytoextraction. This work was carried out to compare the effectiveness of multiple applications of citric and gallic acids on the availability in soil and accumulation of Cd, Pb, Cu, and Zn by velvet bean (Stizolobium aterrimum) plants. The organic acids were added as follows: 5 mmol kg-1 in the 28th cultivation day; two doses of 5 mmol kg-1 at the 28th and 31st day; and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phytoremediation; Soil pollution; Soil remediation; Organic acids.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000100009

EFEITO DA COMPOSIÇÃO DO SUBSTRATO NA FORMAÇÃO DE MUDAS DE LARANJEIRA `PERA'
Provedor de dados: 63
Autores: MOURÃO FILHO,F.A.A.; DIAS,C.T.S.; SALIBE,A.A.
O efeito de cinco composições de substratos na produção de mudas de laranjeira `Pêra' (Citrus sinensis, L. Osbeck) foi estudado sobre três porta-enxertos (limoeiro `Cravo', Citrus limonia, L. Osbeck; tangerineira `Cleópatra', Citrus reticulata, Blanco; e citrumeleiro `Swingle', Citrus paradisi x Poncirus trifoliata). O experimento obedeceu ao delineamento estatístico de blocos aleatorizados em esquema fatorial 5 x 3 (substratos x porta-enxertos). As composições de misturas utilizadas como substrato e respectivas combinações volumétricas foram: 1) Terra (100%); 2) Terra (33%) + areia fina (33%) + esterco bovino curtido (33%); 3) Terra (33%) + vermiculita (33%) + esterco bovino curtido (33%); 4) Terra (33%) + raspas de madeira (33%) + esterco bovino curtido...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Citrus sinensis; Citrus limonia; Citrus reticulata; Citrus paradisi; Poncirus trifoliata; Propagação.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000100007

Qualidade de ameixas (Primus salicina, Lindl.) 'Reubennel' após armazenamento refrigerado
Provedor de dados: 63
Autores: Kluge,R.A.; Hoffmann,A.; Nachtigal,J.C.; Bilhalva,A.B.
O objetivo do trabalho foi verificar a qualidade de ameixas 'Reubemier após 30 e 40 dias de armazenagem a 0°C e 90-95% UR e 1, 2 e 3 dias de comercialização simulada em temperatura ambiente (25-26°C). As perdas de peso das frutas até os 30 dias de armazenamento e durante a comercialização foram de 0,57% e 2,0%, respectivamente, enquanto que, até os 40 dias e durante posterior comercialização, as perdas alcançaram 1,87% e 7,0%, respectivamente. As podridões aumentaram durante a comercialização simulada, principalmente após 40 dias de armazenamento. A firmeza de polpa e a acidez total titulável (ATT) tiveram maiores decréscimos após 40 dias de armazenamento refrigerado. Poucas modificações ocorreram no teor de sólidos solúveis totais (SST). Em virtude da...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Armazenamento refrigerado; Qualidade; Ameixas.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000300012

Climate change and plant diseases
Provedor de dados: 63
Autores: Ghini,Raquel; Hamada,Emília; Bettiol,Wagner.
Human activities are altering greenhouse gas concentrations in the atmosphere and causing global climate change. In the near future, there will certainly be changes in the Brazilian phytosanitary scenario attributed to global climate change. The impacts of climate change can be positive, negative or neutral, since these changes can decrease, increase or have no impact on diseases, depending on each region or period. These impacts will also be observed on plants and other organisms as well as on other agroecosystem components. However, these impacts are not easily determined, and consequently, specialists from several areas must go beyond their disciplinary boundaries and placing the climate change impacts in a broader context. This review focuses on the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: CO2; Global climate change; Global warming; Spatial analysis; Control.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000700015

Economic analysis of soilless and soil-based greenhouse cucumber production in Turkey
Provedor de dados: 63
Autores: Engindeniz,Sait; Gül,Ayse.
Since the onset of the commercial application of soilless culture, this production approach has evoluted at a fast pace, gaining popularity among growers throughout the world. As a result, a lot of information has been developed by growers, advisors, researchers, and suppliers of equipment and substrate. This study aimed to determine the cost and return of soilless greenhouse cucumber (Cucumis sativus L.) production and to prepare a sample budget for growers. Soilless cultivation is an alternative production method for Turkish growers and it is being practised on a commercial basis on 180 ha. Cost and return budgets can be useful for growers because they allows growers to compare total production cost and revenue varying grower type, production time,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cucumis sativus L.; Vegetable; Alternative agriculture; Closed system; Economic feasibility.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000500004

Influência da adubação nitrogenada e potássica na eficiência do uso da água e na qualidade de frutos de melão
Provedor de dados: 63
Autores: Buzetti,S.; Hernandez,F.B.T.; Sá,M.E.; Suzuki,M.A.
O presente trabalho foi conduzido com o objetivo de se estudar 3 doses de N e 3 doses de K2O, combinadas entre si e aplicadas em cobertura aos 15, 30 e 45 dias após a emergência das plântulas, na eficiência do uso da água e na qualidade de frutos de melão. Utilizou-se um Podzólico Vermelho Escuro, eutrófíco, textura média/argilosa, do município de Ilha Solteira(SP). O experimento foi implantado no ano de 1991 fazendo-se uso dos cultivares Valenciano Amarelo e Eldorado 300, em espaçamento de 2,0m entre linhas e 0,75m entre covas. A cultura foi conduzida sem capação e desbrota e os tratamentos fítossanitários procedidos de acordo com a necessidade. Pelos resultados obtidos verificou-se que o N ou o K2O influenciaram alguns parâmetros no cultivar Eldorado...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Melão; Nitrogênio; Potássio; Qualidade de frutos; Eficiência do uso da água.
Ano: 1993
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161993000300014

Variabilidade e correlações entre caracteres em cruzamentos de soja
Provedor de dados: 63
Autores: Lopes,Ângela Celis de Almeida; Vello,Natal Antonio; Pandini,Fábio; Rocha,Maurisrael de Moura; Tsutsumi,Claudio Yuji.
A estimação de parâmetros em gerações iniciais de endogamia tem importância para direcionar o programa de melhoramento, principalmente em relação ao processo de seleção dos genótipos mais promissores. Este trabalho avaliou 21 genótipos de soja (seis parentais e 15 combinações dialélicas em F2), em dois locais (ESALQ e Anhembi) de Piracicaba, SP. O delineamento usado foi em blocos ao acaso, com seis repetições por local. A parcela experimental foi de 12 covas de plantas individuais espaçadas de 0,80 m x 0,80 m. Os caracteres avaliados foram número de dias e altura da planta no florescimento e maturidade; valor agronômico; produtividade de grãos; teor de óleo na semente e produtividade de óleo. Todas as estimativas de parâmetros basearam-se nos componentes...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycine max; Interação genótipo x local; Produtividade de grãos; Produtividade de óleo.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000200021

Seeding density in wheat genotypes as a function of tillering potential
Provedor de dados: 63
Autores: Valério,Igor Pirez; Carvalho,Fernando Irajá Félix de; Oliveira,Antônio Costa de; Benin,Giovani; Souza,Velci Queiroz de; Machado,Amauri de Almeida; Bertan,Ivandro; Busato,Cyrano Cardoso; Silveira,Gustavo da; Fonseca,Daniel Andrei Rob.
Seeding density adjustments is one of the practices that most influence grain yield, as well as other agronomic traits. Therefore, the objective of this study was to determine the ideal plant stand to achieve the maximum grain yield in genotypes showing differential tillering ability. Also, to establish the associations between the genotypes used with tillering and other agronomically important traits as weight of a thousand grains. Two experiments were conducted in 2005 and 2006 in Capão do Leão, Rio Grande do Sul state, Brazil. Five low (JURITI, BR 18, CEP 29, BR 18 and CD 108) and five high (CD 114, SAFIRA, FIGUEIRA, BRS 177 and UMBU) tillering potential wheat cultivars were tested for two years on a split-plot design. The results indicate the need for...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Triticum aestivum L.; Grain yield; Number of fertile tillers; Plant stand.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000100004

Cultivation of Agaricus blazei ss. Heinemann using different soils as source of casing materials
Provedor de dados: 63
Autores: Siqueira,Félix Gonçalves de; Dias,Eustáquio Souza; Silva,Romildo da; Martos,Emerson Tokuda; Rinker,Danny Lee.
Commercial productivity of the Agaricus blazei mushroom is closely related to both the quality of the compost and the choice of soil to be used as a casing material. This study aims to evaluate Agaricus blazei's productivity using two compost formulations and three soils. The two compost formulations were (i) crushed sugarcane bagasse (Saccharum officinarum (L.)) and Coastcross hay (Cynidon dactylon (L.) Pers.), and (ii) crushed sugarcane bagasse (Saccharum officinarum (L.)) and corn husk (Zea mays L.); they were amended with wheat bran, lime, gypsum, superphosphate and urea. The casing materials were extracted from three soils classed as Rhodic Hapludox, Xanthic Hapludox, and Humic Haplaquox. The Rhodic Hapludox soil material was mixed with fragments of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mushroom cultivation; Productivity; Compost; Fruiting indu ction.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000600016

Influência do etileno sobre características químicas de frutos de manga var. Keitt, colhidos em estádio pré-climatérico
Provedor de dados: 63
Autores: Coneglian,R.C.C.; Rodrigues,J.D.
Frutos de manga (Mangifera indica L.) variedade Keitt, colhidos em estádio pré-climatérico, receberam tratamento com 500 e 1.000 ppm de Ethrel (com exceção da testemunha), sendo submetidos a determinações de carboidratos solúveis, vitamina C, proteínas e umidade, de acordo com amostragens realizadas 3, 6, 9 e 16 dias pós-colheita. Os resultados obtidos, revelaram que o Ethrel não excerceu nenhuma influência nas características químicas dos frutos e que, somente em termos de carboidratos solúveis e vitamina C, os frutos mostraram alterações durante a maturação.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Manga; Ethrel; Maturação; Pós-colheita.
Ano: 1994
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000100006

Controle da cochonilha (Orthezia praelonga Douglas, 1891) em laranjeira, com inseticidas granulados
Provedor de dados: 63
Autores: Mariconi,F.A.M.; Nass,L.L.; Passos,H.R.; Ciniglio Neto,F.; Vieira Jr,F.M.; Campos Neto,H.M.
Com o objetivo de se avaliar a eficiência de inseticidas granulados no controle da Orthezia praelonga em laranjeiras, foram empregados o aldicarbe 15% e o imidaclopride 5%, aplicados ao solo. Os tratamentos foram seis, com quatro repetições: A) testemunha; B) aldicarbe, 100g/pl; C) aldicarbe, 65g/pl; D) imidaclopride, 100g/pl; E) aldicarbe, 130g/pl; F) imidaclopride, 75g/pl. Foram feitas seis avaliações: uma prévia e outras cinco após 07, 20, 34, 49 e 70 dias da aplicação. Os melhores tratamentos foram: aldicarbe 100g/pl e aldicarbe, 130g/pl, aos 49 e 70 dias, respectivamente.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cochonilha; Orthezia praelonga; Laranjeira; Controle químico; Inseticidas granulados.
Ano: 1994
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000300016

Reação de resistência de genótipos de tomateiro (Lycopersicum spp.) à infecção por Rhizoctonia solani Kuhn
Provedor de dados: 63
Autores: Cassiolato,A.M. Rodrigues; Melo,I.S. de.
Dada a importância da tomaticultura no Brasil e das enfermidades que atacam esta cultura, da mesma forma que visando futuros estados em programas de melhoramento vegetal para resistência à patógenos, este trabalho teve por objetivos: avaliar o grau de patogenicidade de quatro isolados de Rhizoctonia solani obtidos de plantas doentes de tomateiro (RT), berinjelas (RB1 e RB2) e pimentão (RP), em viveiros, frente a 9 genótipos de tomateiros e avaliar a reação de resistência de 73 genótipos de tomateiros ao R. solani. Nos experimentos utilizou-se solo esterilizado, em condições de casa de vegetação. Para o experimento I, os isolados de R. solani, oriundos das plantas de tomateiro (RT) e berinjela (RB,) foram igualmente mais patogênicos que os isolados de...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Reação de resistência; Genótipos de tomateiros; Patogenicidade; Rhizoctonia solani.
Ano: 1994
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000300011

Grain quality of upland rice cultivars in response to cropping systems in the Brazilian tropical savanna
Provedor de dados: 63
Autores: Crusciol,Carlos Alexandre Costa; Arf,Orivaldo; Soratto,Rogério Peres; Mateus,Gustavo Pavan.
The industrial quality of grain is an important parameter to determine the commercial value of rice and can be influenced by water availability and type of cultivar. The present study aimed to evaluate the milling yield as well as the protein and nutrient contents of polished grains originated from two upland rice cultivars grown under rainfed and sprinkler-irrigated conditions. A randomized block design was used in a split-plot arrangement with eight replicates. Plots consisted of two cropping systems (rainfed and sprinkler-irrigated) with subplots consisting of two cultivars recommended for upland ecosystems (IAC 201 and Carajás). The sprinkler irrigation system increased upland rice milling (8.0%) and head rice yield (23.7%), for years with hot and dry...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Oryza sativa; Sprinkler irrigation; Milling yield; Head rice yield.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000500004

ÉPOCA DE CORTE, PRODUÇÃO, COMPOSIÇÃO QUÍMICO-BROMATOLÓGICA E DIGESTIBILIDADE DA MATÉRIA SECA DA GRAMA-ESTRELA FLORICO
Provedor de dados: 63
Autores: Castro,Flávio Geraldo Ferreira; Haddad,Cláudio Maluf; Vieira,Andrea Campmany; Vendramini,João Maurício Bueno; Heisecke,Osvaldo Ruben Peralta.
Com objetivo de avaliar a produção de matéria seca da grama-estrela "Florico" estudou-se a composição químico-bromatológica, a variação no conteúdo de macro e micronutrientes e a extração destes minerais em função da idade da planta no corte. O delineamento estatístico adotado foi o de blocos completos casualizados, com seis tratamentos e quatro repetições. Os tratamentos constaram de seis idades de corte, com intervalo de 10 dias entre cada corte, sendo que o primeiro corte foi realizado 20 dias após o rebaixamento. Os dados, todos analisados a um nível de probabilidade P &amp;lt; 0,05, mostraram que a produção de matéria seca aumentou de forma quadrática entre 20 e 70 dias de crescimento, enquanto o teor de matéria seca sofreu acréscimo cúbico. A...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Composição química idade de corte Cynodon; Pastagem.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000100030

Produção de matéria seca, valor nutritivo e a maturidade de Digitaria decumbens Stent. cv. transvala
Provedor de dados: 63
Autores: Haddad,Cláudio Maluf; Daiub,José Alfredo Salinas; Castro,Flávio Geraldo Ferreira; Tamassia,Luis Fernando Monteiro.
Este experimento teve como objetivo avaliar a produção de matéria seca, a digestibilidade in vitro e a variação na composição químico-bromatológica e mineral do capim-Transvala (Digitaria decumbens Stent. cv. Transvala) em função da idade de corte. O delineamento estatístico adotado foi inteiramente casualizado, com seis tratamentos e cinco repetições. Os tratamentos constaram de seis idades de corte, com intervalo de 10 dias entre cada corte, sendo que o primeiro corte foi realizado 20 dias após o corte de uniformização. A produção de matéria seca aumentou de forma linear (P &amp;lt; 0,05) com o avanço da idade da planta e a digestibilidade in vitro da matéria seca e o teor de proteína bruta decresceram quadraticamente (P &amp;lt; 0,05). Inversamente, o...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Digitaria decumbens; Composição química; Idade de corte; Pastagem.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000300024

Métodos alternativos do teste de frio para avaliação do vigor de sementes de milho
Provedor de dados: 63
Autores: Caseiro,Roseli Fátima; Marcos Filho,Júlio.
O presente trabalho teve como objetivo básico estudar comparativamente quatro métodos para a condução do teste de frio, visando a avaliação do potencial fisiológico das sementes de milho. Para tanto, foram utilizados dois cultivares de milho (AG 3010 e AG 5011), cada um representado por 5 lotes com potenciais fisiológicos distintos. Amostras de sementes de todos os lotes foram submetidas a quatro procedimentos do teste de frio, a saber: "terra" (mistura de terra e areia) em caixas empilhadas (método tradicional); "terra" em caixas dispostas lado a lado; bandeja com "terra"; bandeja com "terra" + papel toalha. Estes procedimentos foram comparados com os testes de germinação padrão, envelhecimento acelerado e emergência das plântulas em campo. O teste de...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays; Semente; Análise; Potencial fisiológico; Teste de frio; Substrato.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000300014

Defoliation intensity and leaf area index recovery in defoliated swards: implications for forage accumulation
Provedor de dados: 63
Autores: Martins,Clóvis David Medeiros; Schmitt,Daniel; Duchini,Paulo Gonçalves; Miqueloto,Tiago; Sbrissia,André Fischer.
ABSTRACT: This study evaluated the leaf area index (LAI) recovery mechanisms and forage accumulation rates on the regrowth of different grass species subjected to different defoliation intensities. For that purpose, plots of Pennisetum clandestinum (kikuyugrass), Lolium multiflorum (annual ryegrass), and Avena strigosa (black oats) were defoliated from 20 to 80 % of their initial heights (25, 20, and 25 cm, respectively). At different increments in height, forage samples were collected to ground level and used to estimate tiller population density (TPD), leaf area per tiller (LA), and forage mass. From these data, we calculated the leaf area index (LAI), average leaf area index (aLAI), and average and instantaneous forage accumulation rate (FAR and IFAR,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Grazing heights; Grazing management; Intermittent stocking; Sward targets.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000200403

Estresse hídrico e reguladores de crescimento na germinação de sementes de canafístula
Provedor de dados: 63
Autores: Botelho,Beatriz Amoroso; Perez,Sonia Cristina Juliano Gualtieri de Andrade.
Sementes selecionadas escarificadas de canafístula foram submetidas a estresses hídricos simulados, sob 27°C, com ou sem a adição de poliaminas e giberelina. Os valores de porcentagem e velocidade de germinação obtidos com os testes realizados indicaram que as sementes são resistentes ao estresse hídrico, e a adição de putrescina e espermidina nas concentrações de 5 e 10mM aumenta a performance sob estresse hídrico. O uso de giberelina permite a ampliação do limite máximo de tolerância ao estresse hídrico.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Peltophorum dubium; PEG 6000; Espermidina; Giberelina; Putrescina.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000100008

Anatomy, histochemistry and ultrastructure of seed and somatic embryo of Acrocomia aculeata (Arecaceae)
Provedor de dados: 63
Autores: Moura,Elisa Ferreira; Ventrella,Marília Contin; Motoike,Sérgio Yoshimitsu.
Macaw palm (Acrocomia aculeata (Jacq.) Lodd. ex Mart.) is a tropical species with multiple uses, including oil supply for biodiesel production. However, structural and physiological studies of the seed are still scarce, as well as in vitro propagation techniques. The aim of this study was to characterize the anatomy, histochemistry and ultrastructure of the seed and the in vitro somatic embryo of A. aculeata, gaining insight into relationships between the post-harvest seed behavior and the somatic embryo conversion to plant. The zygotic embryo and the endosperm show high quantities of protein and lipids, stored in protein and lipid bodies, respectively. The cell wall storage polysaccharides occur in the thickened cell wall of the endosperm. The absence of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Macaw palm; Zygotic embryo; Endosperm; Storage reserves.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000400004

Auxinic herbicides, mechanisms of action, and weed resistance: A look into recent plant science advances
Provedor de dados: 63
Autores: Christoffoleti,Pedro Jacob; Figueiredo,Marcelo Rodrigues Alves de; Peres,Lázaro Eustáquio Pereira; Nissen,Scott; Gaines,Todd.
Auxin governs dynamic cellular processes involved at several stages of plant growth and development. In this review, we discuss the mechanisms employed by auxin in light of recent scientific advances, with a focus on synthetic auxins as herbicides and synthetic auxin resistance mechanisms. Two auxin receptors were reported. The plasma membrane receptor ABP1 (Auxin Binding Protein 1) alters the structure and arrangement of actin filaments and microtubules, leading to plant epinasty and reducing peroxisomes and mitochondria mobility in the cell environment. The second auxin receptor is the gene transcription pathway regulated by the SCFTir/AFB ubiquitination complex, which destroys transcription repressor proteins that interrupt Auxin Response Factor (ARF)...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: TIR/AFB; SKP2A; Auxin binding protein 1; Reactive Oxygen Species transgenic crops.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162015000400356

Densidade, porosidade e resistência à penetração em Latossolo cultivado sob diferentes sistemas de preparo do solo
Provedor de dados: 63
Autores: Tormena,Cássio Antonio; Barbosa,Mauro Cezar; Costa,Antônio Carlos Saraiva da; Gonçalves,Antonio Carlos Andrade.
Os sistemas de preparo e manejo do solo determinam as condições físicas para o crescimento das plantas e produtividade das culturas. O objetivo deste estudo é o de avaliar algumas propriedades físicas de um Latossolo Vermelho distrófico, cultivado com mandioca, após dois anos de implantação em diferentes sistemas de preparo do solo. Os tratamentos utilizados foram: Plantio Direto (mobilização do solo somente ao longo das linhas de plantio); Preparo Mínimo (escarificação a 0,30 m, seguido de gradagem niveladora) e Preparo Convencional (aração, com arado de aiveca a uma profundidade de 0,25 m, seguido de gradagem niveladora). Avaliaram-se, nas camadas de 0-0,10 m e 0,10-0,20 m, as seguintes propriedades físicas do solo: densidade, volume de macroporos,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Propriedades físicas do solo; Estrutura; Plantio direto; Escarificação; Compactação.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000400026

Alterações anatômicas em estacas de seringueira (Hevea brasiliensis clone RRIM 600) em resposta a diferentes técnicas de indução ao enraizamento
Provedor de dados: 63
Autores: Medrado,M.J.S.; Appezzato-da-Glória,B.; Costa,J.D.
Clones de seringueira (Hevea spp ) são enxertados sobre porta-enxertos oriundos de sementes de ascendência desconhecida e por isto não exteriorizara todo seu potencial genético de produção de látex. A superação desta dificuldade pode ser obtida com o enraizamento de estacas clonais. Todavia, a seringueira é considerada em seu estágio adulto como uma planta de difícil enraizamento. Estas plantas possuem na base do caule um cilindro quase contínuo de tecidos lignificados, que juntamente com barraras químicas podem dificultar o enraizamento. Atualmente, algumas plantas de difícil enraizamento, têm enraizado com a ajuda de um conjunto de técnicas modernas como estiolamento total ou localizado e estrangulamento. Este trabalho, procurou caracterizar as...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hevea brasiliensis; Estacas; Raízes adventícias; Anatomia.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000100016

COMPORTAMENTO FISIOLÓGICO IN VITRO DE BANANEIRA (Musa sp., AAA e AAB) cvs. NANICA E PRATA ANÃ: INFLUÊNCIA DE DIFERENTES NÍVEIS DE POTÁSSIO
Provedor de dados: 63
Autores: Zaidan,Humberto Actis; Oliveira,Enio Tiago de; Gallo,Luiz Antonio; Crocomo,Otto Jesu.
Nas abordagens biotecnológicas de propagação de plantas, os meios de cultura devem ter uma composição química adequada à essa finalidade permitindo a otimização da produção. Como a bananeira (Musa sp.) é exigente em potássio, a busca do nível adequado desse macronutriente envolve não somente o comprometimento com o nível dos outros nutrientes (balanço iônico), mas também a relação entre eles. Para acompanhar os efeitos fisiológicos dos vários teores de K, explantes caulinares dos cvs. "Nanica" e "Prata Anã" foram cultivados em meio MS modificado, em presença de BAP (2,5 mg/L), sacarose, vitaminas e agar, em seis diferentes concentrações de K: 5, 10, 15, 20, 25 e 30 mM, sendo 20 mM a concentração de K no MS básico. Foram feitas análises de massa de matéria...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Musa; Bananeira; Balanço iônico; Potássio; In vitro.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000200020

Post-harvest control of aflatoxin production in in-shell moist peanuts with sodium ortho-phenylphenate: III. Storage tests
Provedor de dados: 63
Autores: Fonseca,H.; Gallo,C.R.; Calori-Domingues,M.A.; Gloria,E.M.; Approbatto,P.J.; Fonseca,E.L.; Zambello,I.V.
The present experiment aimed to evaluate the effect of sodium ortho-phenylphenate (SOP) application to in-shell moist peanuts for the control of aflatoxin production. Previous studies showed the need to improve the SOP solution distribution on peanut pods to evaluate the product. Thus, in this experiment the place of the spray system was the bag filler pipe of the pre-cleaning machine in the warehouse. In the 1989 rainy season two lots of 120 bags of in-shell moist peanuts were sprayed with 0.5 and 1% SOP solutions and aflatoxin production was not controlled. In the dry season of 1989 and in the rainy season of 1990, in-shell moist peanuts were sprayed with 5% SOP solution. The coverage of pods with the solution was efficient, allowing a uniform...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aflatoxins; Peanuts; Chemical control; Sodium ortho-phenylphenate; Post-harvest.
Ano: 1994
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000200025

A methodology to determine size and shape of plots for sugarcane plantation
Provedor de dados: 63
Autores: Cherri,Adriana Cristina; Vianna,Andrea Carla Gonçalves; Ramos,Rômulo Pimentel; Florentino,Helenice de Oliveira.
ABSTRACT: Brazil is the largest sugarcane producer in the world and the leader in the production of sugar and ethanol. Although sugarcane has become an important factor in the Brazilian economy, cultivation has presented many issues, for example, the problems due to burning before the manual harvest. The Brazilian authorities have approved a law that prohibits this practice and mechanized harvesting has thus become the most fitting approach. Given this development, areas for sugarcane plantation must be properly rebuilt to accommodate the new way of harvesting. The main characteristic demanded of sugarcane plots to use harvesting machines is that they must be rectangular. In the present paper, we propose a methodology for dividing the plantation area into...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Planting planning; Sugarcane culture; Mechanized harvesting; AND/OR graph approach.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162019001400266

Water-yield relationships of potato under different irrigation methods and regimens
Provedor de dados: 63
Autores: Erdem,Tolga; Erdem,Yesim; Orta,Halim; Okursoy,Hakan.
Yield response to irrigation of different crops is of major importance in production planning where water resources are limited. This study aims to determine the effect of different irrigation methods and irrigation regimens on potato yield in the Trakya Region, Turkey, during 2003 and 2005. Potato was grown under furrow and drip irrigation methods and three regimens: irrigation applied when 30, 50, or 70% of the available water was consumed. The seasonal potato evapotranspiration ranged on 501 to 683 mm in 2003, and 464 to 647 mm in 2005. The furrow and drip irrigation methods had no significant effect on tuber yield for both years. Irrigation regimens influenced tuber yield (P &lt; 0.05) in 2005, and the highest tuber yield was registered for 30%...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Furrow irrigation; Drip irrigation; Evapotranspiration; Water use efficiency.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000300003

A survey of whole-plant corn silages from Minas Gerais dairy farms
Provedor de dados: 63
Autores: Santos,Andréia de Oliveira dos; Dias Junior,Gilson Sebastião; Pereira,Marcos Neves; Schwan,Rosane Freitas; Ávila,Carla Luiza da Silva.
ABSTRACT  Whole-plant corn silage (WPCS) is a commonly used forage for feeding dairy cattle in Brazil. The aim of this study was to evaluate on-farm ensilaging practices and the nutritional value, microbiology and fermentation profiles of WPCS from dairy farms in the south of the state of Minas Gerais, Brazil. Silages from 54 dairy farms located in nine cities were sampled and a questionnaire was distributed for completion to describe the herd profile and ensilage practices. Herd size ranged from 8 to 1,000 lactating cows, and 52 % of the farms had fewer than 50 cows in lactation. The majority of the farms cultivated hard endosperm texture hybrids (52 %) and used pull-type forage harvesters (87 %). Double-sided plastic was the most used form of silo...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aerobic deterioration; Ensilaging practices; Dairy farming; Lactic acid bacteria.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000200401

What explains the variation on the regenerative component dynamics of Araucaria Forests in southern Brazil?
Provedor de dados: 63
Autores: Vefago,Manoela Bez; Silva,Ana Carolina da; Cuchi,Tarik; Santos,Guilherme Neto dos; Nunes,Amanda da Silva; Rodrigues Júnior,Luiz Carlos; Lima,Carla Luciane; Gross,Aline; Kilca,Ricardo de Vargas; Higuchi,Pedro.
ABSTRACT: The natural regeneration process is essential for forest maintenance since it is critical for establishing new tree individuals. This study aimed to improve the understanding of the regenerative component dynamics of Araucaria Forests in Southern Brazil. We investigated the effects of climate, light, tree component structure and anthropogenic disturbance on tree species regeneration. Regenerating communities from six different fragments in forest remnants of the “Planalto Sul Catarinense” region was evaluated in permanent plots two years after the first inventory. The following demographic rates were determined: recruitment, mortality, net change in the number of individuals and the changes to both upper and lower height classes. The following...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Forest dynamics; Cattle disturbance; Climatic variables; Mixed ombrophyllous forests.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162019001500405

Spatial variability of coffee plant water consumption based on the SEBAL algorithm
Provedor de dados: 63
Autores: Costa,Jéfferson de Oliveira; Coelho,Rubens Duarte; Wolff,Wagner; José,Jefferson Vieira; Folegatti,Marcos Vinicius; Ferraz,Silvio Frosini de Barros.
ABSTRACT: Awareness of evapotranspiration (ET) and crop coefficient (Kc) is necessary for irrigation management in coffee crops. ET and Kc spatial variabilities are disregarded in traditional methods. Methods based on radiometric measurements have potential to obtain these spatialized variables. The Kc curve and spatial variability of actual evapotranspiration (ETa) were determined using images from Landsat 8 satellite. We used images of young and adult coffee plantations from OLI (Operational Land Imager) and TIRS (Thermal Infrared Sensor) sensors over a two-year period. Evapotranspiration was estimated using the Surface Energy Balance Algorithm for Land (SEBAL). Moreover, the reference evapotranspiration (ETo) was estimated through the Penman-Monteith...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Evapotranspiration; Crop coefficient; Satellite.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162019001200093

Biofertilzers with natural phosphate, sulphur and Acidithiobacillus in a siol with low available-P
Provedor de dados: 63
Autores: Stamford,Newton Pereira; Santos,Patrícia Ribeiro dos; Moura,Adriana Muniz Mendes Freire de; Santos,Carolina Etiene de Rosália e Silva; Freitas,Ana Dolores Santiago de.
The production of mineral fertilizers is a expensive process, since it requires high energy consumption, and cannot be produced by small farmers. Laboratory assays were conducted to produce P-biofertilizers from natural phosphate (B5, B10, B15, B20), applying sulphur at different rates (5; 10; 15 and 20%) inoculated with Acidithiobacillus (S*) and testing increasing periods of incubation. A greenhouse experiment was carried out to evaluate the effect of the biofertilizers in a soil with low available P (Typic Fragiudult) from the "Zona da Mata" of Pernambuco State, grown with yam bean (Pachyrhizus erosus) in two consecutive harvests. The treatments were: Natural Phosphate (NP); biofertilizers produced in laboratory (B5, B10, B15, B20) with sulphur and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pachyrhizus erosus; P uptake; Phosphorus fertilization; Yam bean.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000400024

Segments of competition in south brazilian wineries
Provedor de dados: 63
Autores: Miele,Marcelo; Coldebella,Arlei; Waquil,Paulo Dabdab; Miele,Alberto.
The international restructuring process in the beverage sector reached the winemaking business in the 1990s, changing its panorama. Increasing competitive pressure is a characteristic of this period with significant impact in regions such as the countries belonging to the Mercosul block. To support firm strategies and public policies, the goal of this study was to identify the competition segments in winemaking in Rio Grande do Sul, the southern state of Brazil, and in a specific form to propose a typology of wineries based on the Industrial Organization literature. The data used are from the State Wineries Data Bank of Rio Grande do Sul, which were submitted to multivariate statistical analysis, integrating a cluster and principal components analysis in a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Agribusiness; Diversification; Scale; Typology; Wine.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000300003

Anatomical and physiological modifications of micropropagated 'Caipira' banana plants under natural lighy
Provedor de dados: 63
Autores: Costa,Frederico Henrique da Silva; Pasqual,Moacir; Pereira,Jonny Everson Scherwinski; Castro,Evaristo Mauro de.
Research about the use of natural light associated to changes in sucrose levels demonstrated potential in promoting in vitro hardiness of tropical climate species, as well as reducing production costs. However, little is known about physiological and structural changes that happen in the process. This study evaluated the physiological and anatomic performance, and ex vitro survival of micropropagated banana plants in response to cultivation conditions, in the stage of in vitro rooting. Shoots of the 'Caipira' cultivar were cultivated in MS medium, supplemented with 1 mg L-1 NAA and 6 g L-1 agar, in which the following treatments were applied: two sucrose concentrations (15 g L-1 or 30 g L-1) and two cultivation conditions (Natural light - greenhouse and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Musa spp.; Solar light; Carbohydrate; Water loss; Anatomy.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000300007

Greenhouse gas mitigation options in Brazil for land-use change, livestock and agriculture
Provedor de dados: 63
Autores: Cerri,Carlos Clemente; Bernoux,Martial; Maia,Stoecio Malta Ferreira; Cerri,Carlos Eduardo Pellegrino; Costa Junior,Ciniro; Feigl,Brigitte Josefine; Frazão,Leidivan Almeida; Mello,Francisco Fujita de Castro; Galdos,Marcelo Valadares; Moreira,Cindy Silva; Carvalho,João Luis Nunes.
National inventories of anthropogenic greenhouse gas (GHG) emissions (implementation of the National Communications) are organized according to five main sectors, namely: Energy, Industrial Processes, Agriculture, Land-Use Change and Forestry (LUCF) and Waste. The objective of this study was to review and calculate the potential of greenhouse gas mitigation strategies in Brazil for the Agricultural and LUCF. The first step consisted in an analysis of Brazilian official and unofficial documents related to climate change and mitigation policies. Secondly, business as usual (BAU) and mitigation scenarios were elaborated for the 2010-2020 timeframe, and calculations of the corresponding associated GHG emissions and removals were performed. Additionally, two...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: IPCC; EX-ACT; Emission reduction; Carbon fixation.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000100015