Data/hora: 05/06/2024 02:46:00

Provedor de dados: 	63	
País: 	Brazil	
Título: 	Field spatial and temporal patterns of soil water content and bulk density changes	
Autores: 	Timm,Luís Carlos; Pires,Luiz Fernando; Roveratti,Renato; Arthur,Robson Clayton Jacques; Reichardt,Klaus; Oliveira,Júlio Cesar Martins de; Bacchi,Osny Oliveira Santos.	
Data: 	2006-02-01	
Ano: 	2006	
Palavras-chave: 	Neutron/gamma surface probe; Wetting/drying cycles; Spatial and temporal variability.	
Resumo: 	Soil water content (theta) and bulk density (rhos) greatly influence important soil and plant processes, such as water movement, soil compaction, soil aeration, and plant root system development. Spatial and temporal variability of theta and rhos during different periods of the year and different phases of crops are of fundamental interest. This work involves the characterization of spatial and temporal patterns of theta and rhos during different climatic periods of year, aiming to verify whether there are significant temporal changes in rhos at the soil surface layer when submitted to wetting and drying cycles. The field experiment was carried out in a coffee plantation, Rhodic Kandiudalf soil, clayey texture. Using a neutron/gamma surface probe, theta and rhos were measured meter by meter along a 200 m spatial transect, along an interrow contour line. During the wet period there was no difference of spatial patterns of theta while during the dry period differences were observed, and can be associated to precipitation events. It was also observed that there are rhos temporal changes at the soil surface along the studied period as a consequence of the in situ wetting and drying cycles.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000100009	
Editor: 	São Paulo - Escola Superior de Agricultura "Luiz de Queiroz"	
Relação: 	10.1590/S0103-90162006000100009	
Formato: 	text/html	
Fonte: 	Scientia Agricola  v.63 n.1 2006	
Fonte: 	info:eu-repo/semantics/openAccess