Variabilidade espacial de atributos químicos do solo sob diferentes usos e manejos
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Data
2007-12-01
Autores
Cavalcante, Eloiza Gomes Silva [UNESP]
Alves, Marlene Cristina [UNESP]
Souza, Zigomar Menezes de
Pereira, Gener Tadeu [UNESP]
Título da Revista
ISSN da Revista
Título de Volume
Editor
Sociedade Brasileira de Ciência do Solo
Resumo
O uso e manejo do solo e da cultura são importantes condicionadores da variabilidade de atributos do solo. O trabalho foi desenvolvido em Selvíria (MS), com o objetivo de avaliar a variabilidade espacial do pH, potássio (K), cálcio (Ca), magnésio (Mg) e saturação por bases (V) em Latossolo Vermelho sob diferentes usos e manejos. Os solos foram amostrados em malha, com intervalos regulares de 2 m, perfazendo o total de 64 pontos, nas profundidades de 0,0-0,1 e 0,1-0,2 m, nas seguintes áreas: vegetação natural (Cerrado), plantio direto, plantio convencional e pastagem. As maiores variabilidades, medidas por meio do coeficiente de variação, foram observadas para K, Mg e Ca; o pH apresentou o menor coeficiente de variação nos diferentes usos e manejo do solo, e o atributo V, coeficiente de variação médio. Os sistemas preparo convencional e pastagem apresentaram os menores alcances quando comparado aos sistemas Cerrado e plantio direto.
The use and management of soil and crop condition the variability of soil attributes directly. This study was conducted in Selvíria-MS, Brazil with the objective of evaluating the spatial variability of pH, potassium (K), calcium (Ca), magnesium (Mg) and base saturation (% BS) in an Oxisol under different use and management conditions. Soil samples were collected in a grid, in regular 2 m intervals, at 64 grid points, at depths of 0.0-0.1 m and 0.1-0.2 m, from areas of: native cerrado vegetation (savannah), annual crops under no-tillage, annual crops under conventional tillage, and pasture. The highest variabilities, as determined by the coefficient of variation, were observed for K, Mg and Ca, while the lowest coefficient of variation was found for pH in the different uses and management conditions. A medium coefficient of variation was observed for the %BS. The ranges of soils under conventional tillage and pasture systems were smaller than those under native vegetation and no-tillage.
The use and management of soil and crop condition the variability of soil attributes directly. This study was conducted in Selvíria-MS, Brazil with the objective of evaluating the spatial variability of pH, potassium (K), calcium (Ca), magnesium (Mg) and base saturation (% BS) in an Oxisol under different use and management conditions. Soil samples were collected in a grid, in regular 2 m intervals, at 64 grid points, at depths of 0.0-0.1 m and 0.1-0.2 m, from areas of: native cerrado vegetation (savannah), annual crops under no-tillage, annual crops under conventional tillage, and pasture. The highest variabilities, as determined by the coefficient of variation, were observed for K, Mg and Ca, while the lowest coefficient of variation was found for pH in the different uses and management conditions. A medium coefficient of variation was observed for the %BS. The ranges of soils under conventional tillage and pasture systems were smaller than those under native vegetation and no-tillage.
Descrição
Palavras-chave
Tillage, sampling, Geostatistics, Agro-ecosystem, Oxisol, preparo do solo, Amostragem, Geoestatística, Agroecossistema, Latossolo
Como citar
Revista Brasileira de Ciência do Solo. Sociedade Brasileira de Ciência do Solo, v. 31, n. 6, p. 1329-1339, 2007.