Data/hora: 11/06/2024 04:13:35

Provedor de dados: 	90	
País: 	Brazil	
Título: 	Spatial variability of physical attributes of an alfisol under different hillslope curvatures	
Autores: 	Camargo,Livia Arantes; Marques Júnior,José; Pereira,Gener Tadeu.	
Data: 	2010-06-01	
Ano: 	2010	
Palavras-chave: 	Soil-landscape relationship; Geostatistics; Semivariogram.	
Resumo: 	The influence of relief forms has been studied by several authors and explains the variability in the soil attributes of a landscape. Soil physical attributes depend on relief forms, and their assessment is important in mechanized agricultural systems, such as of sugarcane. This study aimed to characterize the spatial variability in the physical soil attributes and their relationship to the hillslope curvatures in an Alfisol developed from sandstone and growing sugarcane. Grids of 100 x 100 m were delimited in a convex and a concave area. The grids had a regular spacing of 10 x 10 m, and the crossing points of this spacing determined a total of 121 georeferenced sampling points. Samples were collected to determine the physical attributes related to soil aggregates, porosity, bulk density, resistance to penetration and moisture within the 0-0.2 and 0.2-0.4 m depth. Statistical analyses, geostatistics and Student's t-tests were performed with the means of the areas. All attributes, except aggregates &gt; 2 mm in the 0-0.2 m depth and macroporosity at both depths, showed significant differences between the hillslope curvatures. The convex area showed the highest values of the mean weighted diameter, mean geometric diameter, aggregates &gt; 2 mm, 1-2 mm aggregates, total porosity and moisture and lower values of bulk density and resistance to penetration in both depth compared to the concave area. The number of soil attributes with greater spatial variability was higher in the concave area.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832010000300003	
Editor: 	Sociedade Brasileira de Ciência do Solo	
Relação: 	10.1590/S0100-06832010000300003	
Formato: 	text/html	
Fonte: 	Revista Brasileira de Ciência do Solo  v.34 n.3 2010	
Fonte: 	info:eu-repo/semantics/openAccess