SABIIA - Sistema Aberto e Integrado de Informação em Agricultura (Sabiia)

Bianco, Silvano; UNESP; Bianco, Matheus Saraiva; UNESP; Carvalho, Leonardo Bianco de; UNESP.

Com o objetivo de obter uma equação matemática que, por meio de parâmetros lineares dimensionais das folhas, permita a estimativa da área foliar de Ageratum conyzoides, estudaram-se relações entre a área foliar real (Sf) e parâmetros dimensionais do limbo foliar, como o comprimento ao longo da nervura principal (C) e a largura máxima (L) perpendicular à nervura principal, em 200 limbos foliares. Foram utilizados os modelos estatísticos: linear Y = a + bx; linear simples Y = bx, geométrico Y = axb e exponencial Y = abx. Os modelos estatísticos lineares, exponenciais e geométricos obtidos podem ser usados para estimação da área foliar do mentrasto. Do ponto de vista prático, sugere-se optar pelo modelo linear simples, envolvendo o produto C*L, com...

Palavras-chave: 5.01.00.00-9 Agronomia planta daninha; Análise de crescimento; Mentrasto. growth analysis; Weed; Billygoat weed.

Ano: 2008

URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/5311

Determination of Merremia cissoids leaf area using the linear measures of the leaflets - doi: 10.4025/actasciagron.v33i3.6379

Carvalho, Leonardo Bianco; FCAV-UNESP; Bianco, Silvano; FCAV-UNESP; Galati, Valéria Cury; UNESP; Panosso, Alan Rodrigo; FCAV-UNESP.

Knowledge of the weed leaf area may give support to study the interference relationships between weeds and crops. The objective of this research was to determine a mathematical equation for M. cissoides leaf area estimation based on the relationship between the leaf blade linear measures. Leaves of the species were collected from a variety of agroecosystems at São Paulo State University, Jaboticabal, São Paulo State, Brazil, measuring the length (L), maximum width (W) and real leaf blade area of the three kinds of leaflets. Linear equations Y = a x (X) were estimated for each kind of leaflet. The confidence intervals of the primary leaflet equation overlapped those ones from the secondary leaflet equation, and then only one equation was considered for...

Palavras-chave: Weed; Growth; Roadside woodrose; Linear fit Weed; Growth; Roadside woodrose; Linear fit.

Ano: 2011

URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/6379

Molecular characterization of accessions of crabgrass (Digitaria nuda) and response to ametryn - DOI: 10.4025/actasciagron.v32i2.3841

Vieira, Viviane Cristina; Faculdade de Ciências Agrárias e Veterinárias/Universidade Estadual Paulista; Alves, Pedro Luís da Costa Aguiar; Faculdade de Ciências Agrárias e Veterinárias/Universidade Estadual Paulista; Picchi, Simone Cristina; Faculdade de Ciências Agrárias e Veterinárias/Universidade Estadual Paulista; Lemos, Manoel Victor Franco; Faculdade de Ciências Agrárias e Veterinárias/Universidade Estadual Paulista; Sena, Janete Apparecida Desidério; Faculdade de Ciências Agrárias e Veterinárias/Universidade Estadual Paulista.

Digitaria species are sugar cane crop weeds in Brazil and are being controlled with herbicides, although there are some reports of control failure, notably to the triazine group. Molecular techniques are recommended to analyze the genetic variability in weeds. RAPD (Random Amplified Polymorphic DNA), PCR-RFLP (Polymerase Chain Reaction – Restriction Fragment Length Polymorphism) and, in combination with sequencing, allow the localization of resistance genes, as well as possible mutations related to the onset of resistant individuals in some species. Thus, the objective of this work was to characterize ten accessions of Digitaria spp. by RAPD and PCR-RFLP markers, to sequence a conserved region of the psb A gene and evaluate the accessions response to...

Palavras-chave: Digitaria; PsbA gene; RAPD; Sequencing; Triazine; Weed Digitaria; PsbA gene; RAPD; Sequencing; Triazine; Weed.

Ano: 2010

URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/3841

Potencial alelopático de Ipomoea fistulosa sobre a germinação de alface e tomate - DOI: 10.4025/actasciagron.v30i3.3553

Lima, Juliana Domingues; UNESP; Moraes, Wilson da Silva; APTA.

O objetivo do presente trabalho foi determinar o potencial alelopático de Ipomoea fistulosa na germinação e crescimento de plântulas. Em laboratório, sementes de alface e de tomate foram colocadas para germinar na presença de água ou extratos de folhas de Ipomoea fistulosa, nas concentrações de 5, 10 e 15% (p/v). Em casa-de-vegetação, as sementes foram colocadas para germinar em bandejas, contendo o substrato Plantmax® e o substrato Plantmax® + resíduo de folhas secas de Ipomoea fistulosa, na proporção 3% (p/p). O extrato aquoso inibiu a germinação e elevou o tempo médio de germinação das sementes, além de reduzir o crescimento da radícula e hipocótilo em todas as concentrações utilizadas. Em casa-de-vegetação, a altura da planta, o número de folhas, o...

Palavras-chave: 5.01.00.00-9 Agronomia Ipomoae fistulosa; Planta daninha; Alelopatia 5.01.03.00-8 Fitotecnia Ipomoea fistulosa; Weed; Alellopathy.

Ano: 2008

URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/3553

Pollination ecology of the tropical weed Triumfetta semitriloba Jacq. (Tiliaceae), in the South-eastern Brazil

BJB

COLLEVATTI,ROSANE G.; CAMPOS,LÚCIO A. O.; SILVA,ALEXANDRE F. DA.

This work aimed to study the pollination ecology of the tropical weed Triumfetta semitriloba Jacq. (Tiliaceae), in Viçosa, South-eastern Brazil, during the flowering season of 1993 and 1994. Two patches located in pasture (P1 and P2) and one patch in a forest trail (P3) were chosen and ten plants on each patch were sorted. The number of opened flowers were counted during one day, in each flowering month and patch. All observed flower visitors were identified and their behavior while visiting flowers was recorded. Frequency of visits to flowered branches was obtained and some pollinator individuals were captured for analysis of pollen load. Flowers are conspicuously yellow and actinomorphic, with five nectaries around the ovary base, and opened sequentially...

Effect of water stress on herbicide efficiency applied to Urochloa decumbens

Palavras-chave: Pollination; Triumfetta semitriloba; Tiliaceae; Tropical bees; Weed.

Ano: 1998

URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081998000300004

Ciencia e Investigación Agraria

Rocha-Pereira,Maria R; Klar,Antônio E; Martins,Dagoberto; Ferreira de Souza,Guilherme S; Villalba,Juana.

This project aimed to measure the control efficiency of Acetil Coenzime A Carboxilase (ACCase)-inhibiting herbicides post-emergence applied to Urochloa decumbens (Stapf) R.D. Webster under different soil water contents. The experiment was conducted in a greenhouse at the Department of Plant Production, Faculty of Agronomic Sciences, UNESP, Botucatu, São Paulo. The experimental design was a completely randomized design with four replications, consisting of a 9 x 4 factorial, combined with three water management systems (-0.03, -0.07 and -1.5 MPa) and three herbicides (fluazifop-p-butyl, haloxyfop-methyl and sethoxydim + oil using four doses (100, 50, 25 and 0% of the recommended dose). Herbicide applications were conducted at two vegetative stages for all...

Tipo: Journal article

Palavras-chave: Chemical control; Graminicide; Water restriction; Weed.

Ano: 2012

URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202012000100018

Fresh matter production by two forms of Oxalis latifolia as influenced by soil and climate

Ciencia e Investigación Agraria

Royo-Esnal,Aritz; López,María Luisa.

Oxalis latifolia is a widely distributed weed that mainly affects corn fields, orchards, plant nurseries and gardens. Two forms of the weed have been identified: the common form, with fish-tailed leaflets, bulbils growing on stolons and dark pink flowers, and the Cornwall form, with rounder leaflets, sessile bulbils and whitish-pale pink flowers. In this study, the fresh matter production, expressed as the increase of the bulbs' fresh weight, of both forms was compared during two growing seasons in two locations. The bulbs were grown in pots from spring to autumn, and different aspects of growth were measured at the end of each season. The total fresh matter production, weight of the apical bulb, total weight of the lateral bulbs and number of lateral...

Tipo: Journal article

Palavras-chave: Bulb; Climate; Oxalis; Soil conditions; Weed.

Ano: 2012

URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202012000200007

Interference periods of velvet bean in sugarcane

Ciência Rural

Bressanin,Fernanda Nunes; Jayme Neto,Nelson; Nepomuceno,Mariluce Pascoalina; Alves,Pedro Luís da Costa Aguiar; Carrega,Willians César.

ABSTRACT: The objective of the present study was to determine the periods of interference of velvet bean on ratoons of sugarcane cultivar 'RB855536' and to identify its potential for decreasing the crop yield and the quality of the harvested product. The experiment was arranged in a randomized block design, with 18 treatments divided into two groups and four replicates per treatment. In the first group, the sugarcane was kept free from velvet bean interference for nine different periods, beginning at bud sprouting: 0-15, 0-30, 0-45, 0-60, 0-90, 0-120, 0-150, and 0-180 days after budding (DAB) and 0-harvest. In the second group, sugarcane was grown in coexistence with velvet bean during the same periods described for the first group. The critical period of...

Efecto de la melaza en los componentes del rendimiento en frijol (Phaseolus vulgaris L.)

Palavras-chave: Saccharum spp.; Mucuna aterrima; Weed; Competition..

Ano: 2016

URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782016000801329

Colegio de Postgraduados

Ayanegui Méndez, Segundo Raúl.

La información experimental del presente trabajo se obtuvo al evaluar en una localidad tres variedades de fríjol (Phaseolus vulgaris L.) de las cuales se encuentra la variedad Canario -107 como precoz, la variedad Negro – Chapingo como intermedia y la variedad Negro – 150 como tardío. El rendimiento depende de componentes que surgen del ciclo biológico de la variedad, de la arquitectura de la planta, de las características de la vaina y también de las cualidades del grano por semilla. Aunque todos los componentes participan en el rendimiento de la planta, no todos son de la misma magnitud, ni reciben el mismo daño cuando el cultivo compite con malezas adaptadas a la región. Para conocer la magnitud de estos efectos, durante el ciclo agrícola del 2006, se...

Tipo: Tesis

Palavras-chave: Frijol; Componentes del rendimiento; Maleza; Maestría; Genética; Bean; Yield Components; Weed.

Ano: 2008

URL: http://hdl.handle.net/10521/1589

Multiple introductions and gene flow in subtropical South American populations of the fireweed, Senecio madagascariensis(Asteraceae)

Genet. Mol. Biol.

Mäder,Geraldo; Castro,Luana; Bonatto,Sandro Luis; Freitas,Loreta Brandão de.

Abstract Non-indigenous plants exhibit different attributes that make them aggressive competitors with indigenous plants and serious threats to biodiversity.Senecio madagascariensis (fireweed, Asteraceae), a native from southern Africa, is a strong competitor in agricultural activities and has toxic alkaloids that may result in high cattle mortality. In Brazil, this weed was collected for the first time in 1995 and has since spread quickly throughout the Pampas region. To better understand the invasion of the fireweed in South America, we used a genetic characterization with internal transcribed spacer (ITS) and microsatellite markers. Based on the ITS data, the southern Brazil populations of S. madagascariensis shared genetic homology with samples taken...

Selectivity of pre-emergence herbicides in potato cv. Innovator

Palavras-chave: Microsatellites; ITS; Pampas; Weed; Spread.

Ano: 2016

URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572016000100135

Horticultura Brasileira

Luz,José Magno Q; Fonseca,Luciano F; Duarte,Ivaniele N.

ABSTRACT Herbicide tolerance differs among potato cultivars. Thus, pre-emergence herbicides in potatoes need to be studied. We evaluated weed control, selectivity and potato yield of cv. Innovator with the herbicides clomazone, metribuzin and linuron. The experimental design was randomized blocks with four replications. One experiment was installed in 2014 (experiment 1, 5 treatments) and another in 2015 (experiment 2, 7 treatments), irrigated by central pivot in Perdizes-MG, Brazil. In experiment 1 treatments consisted of a control (T1), a hoed control (T2), clomazone (360 g ha-1) (T3), metribuzin (480 g ha-1) (T4), and linuron (990 g ha-1) (T5). The treatments in experiment 2 repeated those in experiment 1 (T1 to T5) and added clomazone + metribuzin (360...

Cultura do girassol: tecnologia de produção.

Palavras-chave: Solanum tuberosum; Yield; Weed.

Ano: 2018

URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362018000200223

Manejo de plantas daninhas.

CASTRO, C. de; CASTIGLIONI, V. B. R.; BALLA, A..

Escolha da area e preparo do solo; Correcao da acidez; Adubacao; Epoca de plantio; Plantio; Densidade; Controle de plantas daninhas; Doencas e pragas; Colheita.

Tipo: Folhetos

Palavras-chave: Preparo; Semeadura direta; Epoca; Densidade; Planta daninha; Brasil; Sunflower; Production; Fertilization; Weed; Disease; Pest; Harvest; Acidez; Adubação; Colheita; Doença; Girassol; Pesquisa; Praga; Produção; Semeadura; Solo; Acidity; Density; Brazil; Research; No-tillage; Soil; Sowing date.

Ano: 1993

URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/445278

Controle de plantas daninhas em milho e sorgo: experimentos 1978/79.

CONCENCO, G..

Tipo: Folhetos

Palavras-chave: Planta daninha; Buva; Conyza spp; Controle; Weed; Management; Control; Manejo.

Ano: 2013

URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/965795

SILVA, J. B. da; VIANA, A. C..

Tipo: Folhetos

Palavras-chave: Planta daninha; Controle; Maize; Weed; Control; Milho; Sorgo; Sorghum Bicolor; Zea Mays.

Ano: 1979

URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/478732

Controle químico de ervas daninhas em milho na região do Taiano, Território de Roraima.

RIBEIRO, P. H. E.; ALVES, A. A. C.; MASCARENHAS, R. E. B..

Tipo: Folhetos

Palavras-chave: Taiano; Brasil; Roraima; Maize; Weed; Controle Químico; Erva Daninha; Milho; Chemical control.

Ano: 1983

URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/687510

Sintomas e diagnose de fitotoxicidade de herbicidas na cultura da soja.

GAZZIERO, D. L. P.; NEUMAIER, N..

Fitotoxicidade; Diagnose de fitotoxicidade; Sintomas de fitotoxicidade; Danos causados por outros fatores; Relacao de herbicidas por grupo quimico.

Tipo: Livros

Palavras-chave: Planta daninha; Brasil; Parana; Weed; Herbicide; Phitotoxicity; Controle Químico; Fitotoxicidade; Herbicida; Chemical control; Brazil.

Ano: 1985

URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/447406

Efeito da matocompetição na produção de sorgo-sacarino.

Recomendacoes tecnicas para a cultura da soja na Regiao Central do Brasil.

LINHARES, L. T.; FAVARIN, E. H. V.; DIAS, K. N.; SILVA, C. J. da; CONCENCO, G..

Tipo: Resumo em anais e proceedings

Palavras-chave: Arranjo de plantas; Herbicidas; Planta daninha; Plant arrangement; Herbicide; Weed.

Ano: 2016

URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1054242