Consulta: subjectFacets:"Soil texture"
Registros recuperados: 27
Data/hora: 13/06/2024 04:03:14

Distribución espacial de nematodos agalladores (Meloidogyne spp.), y su relación con factores edáficos en la Vega de Metztitlán, Hidalgo, México
Provedor de dados: 32
Autores: Hernández Flores, Benjamín.
México ocupa el onceavo lugar a nivel mundial como productor de jitomate (Lycopersicon esculentum Mill.), con una producción de 2.15 millones de toneladas (1.7% del total mundial), sin embargo es el segundo comercializador del producto en el mundo con aproximadamente 895,126 toneladas métricas, solo después de España que exporta 1,023,028 toneladas métricas. En México, el jitomate es una de las hortalizas de mayor importancia por el valor de su producción y superficie cultivada. Según cifras del SIAP-SAGARPA la superficie total cosechada durante el año de 2004 fue de 71,502.3 hectáreas y una producción total de 2.3 millones de toneladas, con un valor de la producción de 14,375.6 millones de pesos. En México los principales productores son: Sinaloa, Baja...
Tipo: Tesis
Palavras-chave: M. incognita; M. arenaria; M. javanica; M. hapla; Textura de suelos; Materia orgánica; PH; Conductividad eléctrica; Meloidogyne spp.; Distribución espacial; Maestría; Fitopatología; Soil texture; Organic matter; Electrical conductivity; Spatial distribution.
Ano: 2007
URL: http://hdl.handle.net/10521/1584

Diagnóstico de atributos físico-hídricos dos solos de textura arenosa em áreas de intensificação agrícola no bioma Cerrado.
Provedor de dados: 14
Autores: FILIZOLA, H. F.; FONTANA, A.; DONAGEMMA, G. K.; VIANA, J. H. M.; LUIZ, A. J. B.; SOUZA, M. D. de.
Resumo - As terras onde predominam solos de textura arenosa e franco-arenosa são, em geral, consideradas marginais em relação à sua aptidão agrícola. Isso se dá, em geral, devido à restrita capacidade de retenção de água e de nutrientes nesses solos, o que interfere diretamente na sua capacidade produtiva. O objetivo deste estudo foi avaliar as propriedades físico-hídricas de solos arenosos em áreas de cerrado, agricultura e pecuária em três estados brasileiros (Tocantins, Minas Gerais e Mato Grosso). Os resultados indicam uma concentração da distribuição granulométrica nas faixas da areia fina e da média, porém com diferenças entre os solos avaliados. Todos os solos avaliados têm também outras características em comum, como o elevado índice de...
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Mato Grosso; Minas Gerais; Tocantins; Solo Arenoso; Granulometria; Textura do Solo; Cerrado; Sandy soils; Sandy loam soils; Soil texture; Cerrado soils.
Ano: 2019
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1112863

Calibração e validação de sensor dielétrico para estimativa de teor de água em solos do Cerrado.
Provedor de dados: 14
Autores: SÁ, M. A. C. de; SANTOS JÚNIOR, J. de D. G. dos S.; SANO, E. E.
bitstream/CPAC-2010/30267/1/bolpd-223.pdf
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Solo; Condutividade hidráulica; Manejo do solo; Textura do solo; Umidade do solo; Soil; Hydraulic conductivity; Soil management; Soil texture.
Ano: 2008
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/571893

Qualidade física de solos influenciada pelo uso e manejo na região de Guaraí-TO.
Provedor de dados: 14
Autores: FILIZOLA, H. F.; FONTANA, A.; DONAGEMMA, G. K.; SOUZA, M. D. de; BORTOLON, E. S. O.; BORTOLON, L.
Resumo: As terras onde predominam solos arenosos distribuem-se em extensas áreas em todas as regiões do Brasil, sendo muito utilizadas em áreas de intensificação da agricultura. O uso desses solos nos sistemas agrícolas tem efeito sobre suas características e atributos. Com o objetivo de avaliar as consequências desse uso sobre algumas das suas propriedades físicas foi selecionada uma área localizada em uma propriedade agrícola no município de Guaraí (TO). Em amostras de solos coletadas em 18 trincheiras foram avaliadas a textura, a estabilidade dos agregados, o grau de floculação das argilas, a porosidade, a densidade, a condutividade hidráulica saturada (K s ), a infiltração e a retenção da água no solo. Os solos avaliados não apresentam nenhum dos...
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Solo arenoso; Física do solo; Uso da terra; Textura do solo; Condutividade hidráulica; Porosidade; Retenção de água no solo; Sandy soils; Soil physical properties; Aggregate stability; Soil texture; Soil density; Hydraulic conductivity; Soil water retention; Soil permeability.
Ano: 2017
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1081400

Qualidade física de solos influenciada pelo uso e manejo na região de Guaraí-TO.
Provedor de dados: 14
Autores: FILIZOLA, H. F.; FONTANA, A.; DONAGEMMA, G. K.; SOUZA, M. D. de; BORTOLON, E. S. O.; BORTOLON, L.
Resumo: As terras onde predominam solos arenosos distribuem-se em extensas áreas em todas as regiões do Brasil, sendo muito utilizadas em áreas de intensificação da agricultura. O uso desses solos nos sistemas agrícolas tem efeito sobre suas características e atributos. Com o objetivo de avaliar as consequências desse uso sobre algumas das suas propriedades físicas foi selecionada uma área localizada em uma propriedade agrícola no município de Guaraí (TO). Em amostras de solos coletadas em 18 trincheiras foram avaliadas a textura, a estabilidade dos agregados, o grau de floculação das argilas, a porosidade, a densidade, a condutividade hidráulica saturada (K s ), a infiltração e a retenção da água no solo. Os solos avaliados não apresentam nenhum dos...
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Solo arenoso; Física do solo; Uso da terra; Textura do solo; Condutividade hidráulica; Porosidade; Retenção de água no solo; Sandy soils; Soil physical properties; Aggregate stability; Soil texture; Soil density; Hydraulic conductivity; Soil water retention; Soil permeability.
Ano: 2017
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1075224

Influence of soil physical characteristics on growth of Pinus taeda growth
Provedor de dados: 190
Autores: Bognola, Itamar Antonio; Dedecek, Renato Antonio; Lavoranti, Osmir José; Higa, Antonio Rioyei.
Foi estudado o rendimento de Pinus taeda L. em função de propriedades físico-hídricas do solo. O trabalho foi baseado em um mapeamento detalhado de solos, na escala 1:10.000, em duas áreas da empresa Battistella Florestal, localizadas nos estados de Santa Catarina e Paraná. Os dados dendrométricos utilizados foram coletados em parcelas de inventário florestal contínuo (PIFCs), em um povoamento com área de 2.252 ha. Foram selecionados 28 PIFC’s com árvores de crescimentos diferentes, separadas em dois grupos com idades de 12 e 13/14 anos. Os sítios com árvores de maior idade e de solos com maior teor de argila, em média, apresentaram maior incremento médio anual das árvores. Houve correlações positivas entre o volume de madeira das árvores, a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Macroporosidade; Porosidade de aeração; Textura do solo; Volume de madeira. Soil macroporosity; Aeration porosity; Soil texture; Wood volume.
Ano: 2010
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/90

Ant species distribution along a topographic gradient in a "terra-firme" forest reserve in Central Amazonia
Provedor de dados: 86
Autores: Oliveira,Pollyana Yvonica de; Souza,Jorge Luiz Pereira de; Baccaro,Fabricio Beggiato; Franklin,Elizabeth.
In Amazonia, topographical variations in soil and forest structure within "terra-firme" ecosystems are important factors correlated with terrestrial invertebrates' distribution. The objective of this work was to assess the effects of soil clay content and slope on ant species distribution over a 25 km² grid covering the natural topographic continuum. Using three complementary sampling methods (sardine baits, pitfall traps and litter samples extracted in Winkler sacks), 300 subsamples of each method were taken in 30 plots distributed over a wet tropical forest in the Ducke Reserve (Manaus, AM, Brazil). An amount of 26,814 individuals from 11 subfamilies, 54 genera, 85 species and 152 morphospecies was recorded (Pheidole represented 37% of all...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Beta diversity; Environmental gradient; Formicidae; Soil texture; Tropical forest.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2009000800008

Control of ALS- and EPSPS-Resistant Amaranthus palmeri by Alternative Herbicides Applied in PRE- and POST-Emergence
Provedor de dados: 87
Autores: GONÇALVES NETTO,A.; NICOLAI,M.; CARVALHO,S.J.P.; MALARDO,M.R.; LÓPEZ-OVEJERO,R.F.; CHRISTOFFOLETI,P.J.
ABSTRACT: The emergence of resistant biotypes of the Amaranthus palmeri species in cotton production areas of the state of Mato Grosso, Brazil, generated the need for correct identification of this species and information on viable herbicidal tools for their management. Thus, greenhouse experiments were conducted to evaluate the efficacy of alternative herbicides applied to A. palmeri in pre and post emergence. A randomized block design with four replications was used. The efficacy of herbicides applied in pre emergence was evaluate in two experiments, one in a clayey and other in a sandy soil; 9 herbicide treatments (8 with herbicide application and a control without application) were applied on each soil. Subsequently, two experiments with different...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Caruru; Weed control; Resistance; Phenology; Soil texture.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582019000100193

Use of Sunflower and Soybean as Bioindicators to Detect Atrazine Residues in Soils
Provedor de dados: 87
Autores: NOVAIS,J.; MENDES,K.F.; INOUE,M.H.; MACIEL,C.D.G.; HELVIG,E.O.; STANIESKI,C.M.
ABSTRACT: Atrazine is selective for maize, sugarcane and sorghum and may interfere with successor crops such as sunflower and soybean. Despite this problem, there are few studies about the residual effect of this herbicide in these crops. Thus, the objective of the research was to evaluate the residual effect of atrazine through bioavailability of the herbicide in sandy and clayey soils, using soybean and sunflower as bioindicators. The design was completely randomized with four replications and a 2 × 7 + 1 factorial scheme, that is, two doses (2,000 and 2,500 g ha-1), seven application times (0, 15, 30, 45, 60, 75 and 90 days between application (DBA) of herbicide and bioindicator sowing) and one control without application. Dry mass and chlorophyll...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Residual effect; Herbicide; Bioassay method; Soil texture.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582019000100160

Carbon balance and crop residue management in dynamic equilibrium under a no-till system in Campos Gerais
Provedor de dados: 90
Autores: Ferreira,Ademir de Oliveira; Sá,João Carlos de Moraes; Harms,Mônica Gabrielle; Miara,Simone; Briedis,Clever; Quadros Netto,Caio; Santos,Josiane Burkner dos; Canalli,Lutécia Beatriz.
The adoption of no-tillage systems (NT) and the maintenance of crop residues on the soil surface result in the long-term increase of carbon (C) in the system, promoting C sequestration and reducing C-CO2 emissions to the atmosphere. The purpose of this study was to evaluate the C sequestration rate and the minimum amount of crop residues required to maintain the dynamic C equilibrium (dC/dt = 0) of two soils (Typic Hapludox) with different textural classes. The experiment was arranged in a 2 x 2 x 2 randomized block factorial design. The following factors were analyzed: (a) two soil types: Typic Hapludox (Oxisol) with medium texture (LVTM) and Oxisol with clay texture (LVTA), (b) two sampling layers (0-5 and 5-20 cm), and (c) two sampling periods (P1 -...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: C sequestration rate; Soil texture; Subtropical soils.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832012000500022

Performance of a reciprocal shaker in mechanical dispersion of soil samples for particle-size analysis
Provedor de dados: 90
Autores: Dourado,Thayse Aparecida; Silva,Laura Fernanda Simões da; Marinho,Mara de Andrade.
The dispersion of the samples in soil particle-size analysis is a fundamental step, which is commonly achieved with a combination of chemical agents and mechanical agitation. The purpose of this study was to evaluate the efficiency of a low-speed reciprocal shaker for the mechanical dispersion of soil samples of different textural classes. The particle size of 61 soil samples was analyzed in four replications, using the pipette method to determine the clay fraction and sieving to determine coarse, fine and total sand fractions. The silt content was obtained by difference. To evaluate the performance, the results of the reciprocal shaker (RSh) were compared with data of the same soil samples available in reports of the Proficiency testing for Soil Analysis...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil texture; Pipette method; Mechanical dispersion; Accuracy analysis.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832012000400008

Effects of erosion and deposition on particle size distribution of deposited farmland soils on the chinese loess plateau
Provedor de dados: 90
Autores: Zhao,Pei; Shao,Ming An; Omran,Wail; Amer,Abdel-monem Mohamed.
Particle size distribution (PSD) in the soil profile is strongly related to erosion, deposition, and physical and chemical processes. Water cycling and plant growth are also affected by PSD. Material sedimented upstream of the dam constructions formed large areas of deposited farmland (DF) soils on the Chinese Loess Plateau (CLP), which has been the site of the most severe soil erosion in the world. Two DFs without tillage on the CLP were chosen to study the combined effect of erosion and check dams on PSD. Eighty-eight layers (each 10 cm thick) of filled deposited farmland (FDF) soils and 22 layers of silting deposited farmland (SDF) soils of each studied soil profile were collected and 932 soil samples were investigated using laser granulometry. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil texture; Stratification; Soil erodibility; Dam construction; Soil conservation.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832011000600028

Pedotransfer functions to estimate proctor test parameters under different tillage systems
Provedor de dados: 90
Autores: Álvarez,Carina Rosa; Micucci,Federico Guillermo; Bustingorri,Carolina; Taboada,Miguel Angel.
The Proctor test is time-consuming and requires sampling of several kilograms of soil. Proctor test parameters were predicted in Mollisols, Entisols and Vertisols of the Pampean region of Argentina under different management systems. They were estimated from a minimum number of readily available soil properties (soil texture, total organic C) and management (training data set; n = 73). The results were used to generate a soil compaction susceptibility model, which was subsequently validated using a second group of independent data (test data set; n = 24). Soil maximum bulk density was estimated as follows: Maximum bulk density (Mg m-3) = 1.4756 - 0.00599 total organic C (g kg-1) + 0.0000275 sand (g kg-1) + 0.0539 management. Management was equal to 0 for...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil organic carbon; Soil compaction; Soil texture.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832010000600002

Satellite Spectral Data on the Quantification of Soil Particle Size from Different Geographic Regions
Provedor de dados: 90
Autores: Demattê,José Alexandre Melo; Guimarães,Clécia Cristina Barbosa; Fongaro,Caio Troula; Vidoy,Emmily Larissa Felipe; Sayão,Veridiana Maria; Dotto,André Carnieletto; Santos,Natasha Valadares dos.
ABSTRACT: The study of soils, including their physical and chemical properties, is essential for agricultural management. Soil quality must be maintained to ensure sustainable production of food and conservation of natural resources. In this context, soil mapping is important to provide spatial information, which can be performed using remote sensing (RS) techniques. Modeling through use of satellite data is uncertain regarding the amplitude of replicability of the models. The aim of this study was to develop a quantification model for soil texture based on reflectance information from a continuum of bare soils, obtained by overlapping multi-temporal satellite images, and apply this model to an unknown region to evaluate its applicability. Spectral data...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil texture; Remote sensing; Bare soil mask; Multiple linear regression; Digital soil mapping.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832018000100310

Growth, nodulation and nitrogen fixation of cowpea in soils amended with composted tannery sludge
Provedor de dados: 90
Autores: Santos,Joseany Andrade; Nunes,Luís Alfredo Pinheiro Leal; Melo,Wanderley José de; Figueiredo,Marcia Barreto do Vale; Singh,Rajeev Pratap; Bezerra,Antônio Aécio Carvalho; Araújo,Ademir Sérgio Ferreira de.
Tannery wastes generation is increasing every year and a suitable method for tannery sludge management is necessary in order to decrease this environmental problem. The composting is recognized as a suitable method for sludge recycling.. The effect of tannery sludge compost (TSC) rates on growth, nodulation and N fixation of cowpea was investigated. Sandy and clayey soils were amended with TSC at rates of 0, 7.5, 15, 30, and 60 t ha-1. The shoot dry weight of cowpea plants 45 days after emergence (DAE) was greater in the TSC-amended than in the unamended soil. In the sandy soil, nodule dry weight increased with TSC application 45 DAE. In the clayey soil, 45 DAE, nodule dry weight decreased with TSC amendment levels greater than 7.5 t ha-1 compared to the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Waste; Soil texture; Composting; Heavy metal.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832011000600003

Availability of soil water under tillage systems, mulch management and citrus rootstocks
Provedor de dados: 90
Autores: Fidalski,Jonez; Auler,Pedro Antonio Martins; Beraldo,José Marcos Garrido; Marur,Celso Jamil; Faria,Rogério Teixeira de; Barbosa,Graziela Moraes de Cesare.
The increased availability of soil water is important for the management of non-irrigated orange orchards. The objective of this study was to evaluate the availability of soil water in a Haplorthox (Rhodic Ferralsol) under different tillage systems used for orchard plantation, mulch management and rootstocks in a "Pêra" orange orchard in northwest Paraná, Brazil. An experiment in a split-split-plot design was established in 2002, in an area cultivated with Brachiaria brizantha grass in which three tillage systems (no tillage, conventional tillage and strip-tillage) were used for orchard plantation. This grass was mowed twice a year between the rows, representing two mulch managements in the split plots (no mulching and mulching in the plant rows). The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brachiaria brizantha; No tillage; Soil management; Soil texture; Time domain reflectometry.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832010000300033

Potential of Spectroradiometry to Classify Soil Clay Content
Provedor de dados: 90
Autores: Dotto,André Carnieletto; Dalmolin,Ricardo Simão Diniz; Caten,Alexandre ten; Moura-Bueno,Jean Michel.
ABSTRACT Diffuse reflectance spectroscopy (DRS) is a fast and cheap alternative for soil clay, but needs further investigation to assess the scope of application. The purpose of the study was to develop a linear regression model to predict clay content from DRS data, to classify the soils into three textural classes, similar to those defined by a regulation of the Brazilian Ministry of Agriculture, Livestock and Food Supply. The DRS data of 412 soil samples, from the 0.0-0.5 m layer, from different locations in the state of Rio Grande do Sul, Brazil, were measured at wavelengths of 350 to 2,500 nm in the laboratory. The fitting of the linear regression model developed to predict soil clay content from the DRS data was based on a R2 value of 0.74 and 0.75,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil texture; Diffuse reflectance of the soil; Proximal soil sensing.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832016000100301

Structural changes in latosols of the cerrado region: I - relationships between soil physical properties and least limiting water range
Provedor de dados: 90
Autores: Severiano,Eduardo da Costa; Oliveira,Geraldo César de; Dias Júnior,Moacir de Souza; Costa,Katia Aparecida de Pinho; Silva,Fabiano Guimarães; Ferreira Filho,Silvio Marcos.
The agricultural potential of Latosols of the Brazilian Cerrado region is high, but when intensively cultivated under inappropriate management systems, the porosity can be seriously reduced, leading to rapid soil degradation. Consequently, accelerated erosion and sedimentation of springs and creeks have been observed. Therefore, the objective of this study was to evaluate structural changes of Latosols in Rio Verde, Goiás, based on the Least Limiting Water Range (LLWR), and relationships between LLWR and other physical properties. Soil samples were collected from the B horizons of five oxidic Latosols representing the textural variability of the Latosols of the Cerrado biome. LLWR and other soil physical properties were determined at various soil...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil compaction; Degradation of agricultural soils; Soil penetration resistance; Water availability; Soil texture.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832011000300013

Potassium leaching in different soils as a function of irrigation depths
Provedor de dados: 91
Autores: Mendes,Walter da C.; Alves Júnior,José; Cunha,Paulo C. R. da; Silva,Anderson R. da; Evangelista,Adão W. P.; Casaroli,Derblai.
ABSTRACT Potassium (K) can be easily lost by the leaching process. The objective of this study was to quantify K leaching in clayey and sandy soils under increasing irrigation depths. The experiment was conducted in 2014, in a protected environment, after extraction of undisturbed soil columns, with diameter of 144 mm and height of 300 mm. The columns were arranged in a randomized complete block in a factorial design with three replicates, corresponding to eight treatments: two soil types and four water depths, equivalent to 50, 100, 150 and 200% of the amount of water necessary to bring the soil moisture to field capacity. Potassium chloride, with 58% of K2O, was used as K source. Water replacement in the columns was performed every three days, for a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fertilization; Soil texture; Nutrient loss; Water management.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662016001100972

Growth and physiology of maize under water salinity and nitrogen fertilization in two soils
Provedor de dados: 91
Autores: Braz,Régis dos S.; Lacerda,Claudivan F. de; Assis Júnior,Raimundo N. de; Ferreira,Jorge F. da S.; Oliveira,Adriana C. de; Ribeiro,Aureliano de A.
ABSTRACT The nitrogen fertilization, in general, minimizes the effects of salinity on plants, but the mitigating action depends on plant species, cultivar, soil texture and plant age, among other factors. The objective of this study was to evaluate the effects of irrigation water salinity and nitrogen fertilization on maize physiology and growth (Zea mays) in soils with different textures. The experiment was carried out in a greenhouse in Fortaleza City, CE, Brazil, in PVC soil columns (100 x 20 cm). The design was completely randomized using the factorial 2 x 2 x 4, referring to two soils, an Ultisol and a Quartzipsamment, nitrogen doses of 105 and 210 kg ha-1, under irrigation with saline water of 0.5, 2.0, 4.0 and 6.0 dS m-1, with four repetitions. With...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays; Leaf gas exchange; Soil texture.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662019001200907

Yellow Passion fruit performance in organic crop under mulch
Provedor de dados: 94
Autores: Uchôa,Thays Lemos; Araújo Neto,Sebastião Elviro de; Selhorst,Pablo Oliveira; Rodrigues,Maria Júlia da Silva; Galvão,Robson de Oliveira.
Abstract  The aim of this work was to evaluate the effect of mulch on clay loam and sandy loam soils on the start harvest, number of fruits per plant, yield and quality of yellow passion fruits in organic crop. A complete randomized block design with five treatments and four replicates of five plants each was used. Treatments corresponded to different percentages of mulch of the area occupied by the plant (3 x 3 m), extending from the center of the planting line to the planting row in 0% without mulch (T1); 25% (T2); 50% (T3); 75% (T4) and 100% (T5). Mulch anticipated the harvest in comparison to crop in uncovered soil in both types of soil. The number of fruits per plant and yield increased in a quadratic function with maximum point of 38.6 fruits plant-1...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Passiflora edulis f. flavicarpa Degener; Soil texture; Fruit quality; Organic fruit crop.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452018000200702

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

The effect of different soil properties on arbuscular mycorrhizal colonization of peanuts, sorghum and maize
Provedor de dados: 39
Autores: Carrenho,Rosilaine; Trufem,Sandra Farto Botelho; Bononi,Vera Lúcia Ramos; Silva,Eraldo Schunk.
Arbuscular mycorrhizal fungi (AMF) are important for plant growth since they increase mineral influx. However, symbiosis efficiency is affected by many environmental factors. This study evaluated the effects of different treatments (+/- phosphorus; +/- liming; +/- organic matter; field, sandy or clayey soil textures) on root colonization (RC) of peanuts, sorghum and maize. The combination of these resulted in seventy-two treatments. The 2×2×2×3×3 factorial experiment was laid out in a randomized design. All data were subjected to variance analysis and the means were compared (Tukey at P&lt;0.05). Three months after seed germination, roots were collected to evaluate the percentage of RC. Results showed that soil texture and liming were the most important...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mycorrhiza; Liming; Soil texture; Organic matter; Phosphorus.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062007000300018

Estimation of infiltration rate of a paddy growing area in a micro watershed of Sikkim, India
Provedor de dados: 111
Autores: Patle, G T.
This study aimed to estimate the constant infiltration rates from paddy growing area of a micro watershed located in the hilly state of Sikkim, India. Double ring infiltometer test was used for the field measurement of infiltration rates. The observed infiltration rates were compared with predicted values obtained by Horton, Philip, Kostiokov and Green-Ampt infiltration models. The suitability analysis of models was checked through statistical tools namely coefficient of determination and standard error and the best model was identified for the paddy fields of hill topography. The soil samples were collected for the estimation of soil moisture content, bulk density and soil texture analysis. Soil texture was sandy loam to loamy sand within the micro...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Infiltration; Infiltration models; Paddy fields; Sikkim; Soil texture; Watershed.
Ano: 2021
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/6659

USLE/RUSLE K-factors allocated through a linear mixed model for Uruguayan soils
Provedor de dados: 118
Autores: Beretta-Blanco,Andrés; Carrasco-Letelier,Leonidas.
Soil erosion by rainfall is a process that demands management, both for the prevention of excessive soil erosion and for the protection of the quality of freshwater bodies. Erosion coefficients (K-factors) of the universal soil loss equation (USLE)/revised USLE (RUSLE) model were assigned to 99 mapped Uruguayan soil types at 1:1,000,000 scale. This work developed a linear mixed model (LMM) with 79 soils with assigned K-factors, in which the following variables were considered: soil taxonomy, chemical composition, and parent material. The developed LMM had an R²=0.86, in which the soil taxonomy (p&lt;0.0001), parent material (p=0.0174), clay (p=0.0005) and sand (p=0.017) contents had significant statistical effects. The prediction capacity of this model was...
Tipo: Journal article
Palavras-chave: Soil classification; Parent material; Soil texture; Soil chemistry.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202017000100011

Adjustment of the expedite method for clay content determination in Rondônia soils
Provedor de dados: 65
Autores: Schlindwein,Jairo André; Miotti,Alan Antonio; Fioreli-Perira,Elaine Cosma; Pequeno,Petrus Luiz de Luna; Bortolon,Leandro; Marcolan,Alaerto Luiz.
Soil clay content is an important soil attribute and has been used to classification of phosphorus status in the soil in order to determinate the needing of phosphorus amounts to be applied to crops production. The aim of this research was to adjust the method for soil clay content determination, adopted by the laboratories of Southern Brazil (ROLAS-RS/SC), for soil clay content evaluation in Rondônia soils. The study was conducted using 50 soil samples from Rondônia State with wide range clay content. It was tested shaking periods (1.5, 2.0 and 2.5h) associated with periods for soil particles decantation (1.5 and 2.0h) to correlate with the standard method for soil texture testing, known as the pipette method. Clay content determined through this method...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Clay determination; Clay decantation; Shaking period; Soil texture; Soil physics.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782011001200010

Correcting field determination of elemental contents in soils via portable X-ray fluorescence spectrometry
Provedor de dados: 64
Autores: Dijair,Thaís Santos Branco; Silva,Fernanda Magno; Teixeira,Anita Fernanda dos Santos; Silva,Sérgio Henrique Godinho; Guilherme,Luiz Roberto Guimarães; Curi,Nilton.
ABSTRACT Portable X-ray fluorescence (pXRF) spectrometry has been useful worldwide for determining soil elemental content under both field and laboratory conditions. However, the field results are influenced by several factors, including soil moisture (M), soil texture (T) and soil organic matter (SOM). Thus, the objective of this work was to create linear mathematical models for conversion of Al2O3, CaO, Fe, K2O, SiO2, V, Ti and Zr contents obtained by pXRF directly in field to those obtained under laboratory conditions, i.e., in air-dried fine earth (ADFE), using M, T and SOM as auxiliary variables, since they influence pXRF results. pXRF analyses in field were performed on 12 soil profiles with different parent materials. From them, 59 samples were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: PXRF; Soil moisture; Soil texture; Soil organic matter; Prediction models.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542020000100211