Data/hora: 11/06/2024 03:30:19

Provedor de dados: 	86	
País: 	Brazil	
Título: 	Prediction of soil shear strength in agricultural and natural environments of the Brazilian Cerrado	
Autores: 	Silva,Reginaldo Barboza da; Dias Junior,Moacir de Souza; Iori,Piero; Silva,Francisca Alcivânia de Melo; Folle,Sergio Mauro; Franz,Claudio Alberto Bento; Souza,Zigomar Menezes de.	
Data: 	2015-01-01	
Ano: 	2015	
Palavras-chave: 	Cohesion limits; Machine-ground interaction; Mechanical resistance; Precompression stress; Soil compaction; Soil physical quality.	
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.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2015000100082	
Editor: 	Embrapa Secretaria de Pesquisa e Desenvolvimento

Pesquisa Agropecuária Brasileira	
Relação: 	10.1590/S0100-204X2015000100009	
Formato: 	text/html	
Fonte: 	Pesquisa Agropecuária Brasileira  v.50 n.1 2015	
Fonte: 	info:eu-repo/semantics/openAccess