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Título: | Prediction of soil shear strength in agricultural and natural environments of the brazilian cerrado |
Título(s) alternativo(s): | Predição da tensão de cisalhamento do solo em ambientes agrícola e natural do cerrado brasileiro |
Palavras-chave: | Cohesion limits Machine-ground interaction Mechanical resistance mechanical resistance Soil compaction Soil physical quality |
Data do documento: | Jan-2015 |
Editor: | Empresa Brasileira de Pesquisa Agropecuária (EMBRAPA), Secretaria de Pesquisa e Desenvolvimento (SPD) |
Citação: | SILVA, R. B. da et al. Prediction of soil shear strength in agricultural and natural environments of the brazilian cerrado. Pesquisa Agropecuária Brasileira, Brasília, DF, v. 50, n. 1, p. 82-91, Jan. 2015. DOI: 10.1590/S0100-204X2015000100009. |
Resumo: | The objective of this work was to develop uni- and multivariate models to predict maximum soil shear strength (τmax) under different normal stresses (σn), water contents (U), and soil managements. The study was carried out in a Rhodic Haplustox under Cerrado (control area) and under no-tillage and conventional tillage systems. Undisturbed soil samples were taken in the 0.00-0.05 m layer and subjected to increasing U and σn, in shear strength tests. The uni- and multivariate models - respectively τmax=10(a+bU) and τmax=10(a+bU+cσn) - were significant in all three soil management systems evaluated and they satisfactorily explain the relationship between U, σn, and τmax. The soil under Cerrado has the highest shear strength (τ) estimated with the univariate model, regardless of the soil water content, whereas the soil under conventional tillage shows the highest values with the multivariate model, which were associated to the lowest water contents at the soil consistency limits in this management system. |
URI: | http://repositorio.ufla.br/jspui/handle/1/56557926 |
Aparece nas coleções: | DCS - Artigos publicados em periódicos |
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ARTIGO_Prediction of soil shear strength in agricultural and natural environments of the brazilian cerrado.pdf | 1,18 MB | Adobe PDF | Visualizar/Abrir |
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