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Data/hora: 06/06/2024 07:56:33

Atributos de solo determinantes para a estimativa do índice de estabilidade de agregados
Provedor de dados: 86
Autores: Tavares Filho,João; Feltran,Clarissa Tieme Matsuda; Oliveira,José Francirlei de; Almeida,Edinei de; Guimarães,Maria de Fátima.
O objetivo deste trabalho foi identificar atributos de solo importantes para a estimativa do índice de estabilidade de agregados. Para a identificação dos atributos, utilizou-se a regressão múltipla "stepwise" em dados coletados de Latossolo Vermelho eutroférrico, cultivado em sistema de plantio direto. Para a obtenção dos modelos de estimativa do índice de estabilidade de agregados (IeaE), foram analisadas dez variáveis independentes: argila total, densidade do solo, resistência à penetração, matéria orgânica, pH em água, capacidade efetiva de troca de cátions, água disponível, volume total de poros, macroporosidade e umidade gravimétrica. Os atributos argila total (Arg), densidade do solo (Ds), resistência à penetração (RP), matéria orgânica (MO) e pH...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Agregação; Estrutura do solo; Função de pedotransferência; Modelagem; Plantio direto; Regressão múltipla.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2012000300016

Morphostructural characterization of soil conventionally tilled with mechanized and animal traction with and without cover crop
Provedor de dados: 90
Autores: Ralisch,Ricardo; Almeida,Edinei de; Silva,Adriana Pereira da; Pereira Neto,Osvaldo Coelho; Guimarães,Maria de Fátima.
The structural stability and restructuring ability of a soil are related to the methods of crop management and soil preparation. A recommended strategy to reduce the effects of soil preparation is to use crop rotation and cover crops that help conserve and restore the soil structure. The aim of this study was to evaluate and quantify the homogeneous morphological units in soil under conventional mechanized tillage and animal traction, as well as to assess the effect on the soil structure of intercropping with jack bean (Canavalia ensiformis L.). Profiles were analyzed in April of 2006, in five counties in the Southern-Central region of Paraná State (Brazil), on family farms producing maize (Zea mays L.), sometimes intercropped with jack bean. The current...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil tillage; Cultural profile; Morphological homogeneous units; Structural recovering.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832010000600003

Modelling of soil penetration resistance for an oxisol under no-tillage
Provedor de dados: 90
Autores: Tavares Filho,João; Feltran,Clarissa Tieme Matsuda; Oliveira,José Francirlei de; Almeida,Edinei de.
Soil penetration resistance is an important property that affects root growth and elongation and water movement in the soil. Since no-till systems tend to increase organic matter in the soil, the purpose of this study was to evaluate the efficiency with which soil penetration resistance is estimated using a proposed model based on moisture content, density and organic matter content in an Oxisol containing 665, 221 and 114 g kg-1 of clay, silt and sand respectively under annual no-till cropping, located in Londrina, Paraná State, Brazil. Penetration resistance was evaluated at random locations continually from May 2008 to February 2011, using an impact penetrometer to obtain a total of 960 replications. For the measurements, soil was sampled at depths of 0...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: No-till; Compaction; Physical properties; Organic matter.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832012000100010