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| Registros recuperados: 29 | |
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| 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 |
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| 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 |
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| 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<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 |
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| 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 |
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| 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 |
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| 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: Livros |
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 |
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| LIMA, J. E. F. W.; SILVA, E. M. da. |
| RESUMO: O conhecimento sobre a distribuição granulométrica de partículas sólidas é essencial para as áreas de material de construção, mecânica dos solos, física dos solos, hidrossedimentologia, entre outras. Em geral, as técnicas utilizadas para a avaliação da distribuição granulométrica de amostras resultam em valores pontuais, dependendo de posterior interpolação para o traçado da curva granulométrica e a obtenção de diâmetros característicos específicos. A transformação de valores pontuais em funções contínuas pode ser realizada por meio de modelos matemáticos. Entretanto, poucos estudos têm sido desenvolvidos com o fito de determinar o melhor modelo para o ajuste de curvas granulométricas. Sendo assim, o objetivo deste trabalho foi testar e comparar 14... |
| Tipo: Livros |
Palavras-chave: Soil chemicophysical properties; Non-linear regression; Growth rate; Growth curves; Curva de Crescimento; Física do Solo; Granulometria; Regressão Linear; Solo; Textura do Solo; Granules; Soil texture. |
| Ano: 2003 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/569214 |
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| 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: Folhetos |
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 |
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| CARVALHO JUNIOR, W. de; MARTINS, A. M. M.; DART, R. de O.; PEREIRA, N. R.; MACEDO, J. R. de; BHERING, S. B.; VASQUES, G. M.; CHAGAS, C. da S.; CALDERANO FILHO, B.. |
| O objetivo deste trabalho foi testar uma metodologia de aprendizado de máquina aplicada sobre imagens sintéticas e dados de solos, para mapear o teor de argila superficial dos solos em dois municípios do Estado do MS. |
| Tipo: Folhetos |
Palavras-chave: Mapeamento Digital; Selo ODS 2; Argila; Solo; Mapa; Análise do Solo; Textura do Solo; Soil analysis; Soil map; Clay; Digital images; Soil texture. |
| Ano: 2022 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1149841 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| Registros recuperados: 29 | |
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