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Variabilidade e correla??o espacial de propriedades físicas de solo sob plantio direto e preparo convencional

DOI: 10.1590/S0100-06832008000400001

Keywords: soil bulk density, soil porosity, spatial variability, cross-semivariogram, no-tillage.

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Abstract:

soil management systems modify the spatial distribution of soil physical properties. the objectives of this study were to verify the spatial dependency and co-relationship of some soil physical properties by data fitting to individual and cross-semivariograms in an oxisol (typic haplorthox) under no-till and conventional tillage, in campo mour?o, state of parana, brazil. in april 2004, 128 undisturbed soil samples were collected in a 3 x 5 m grid, in the middle of the 5-0.15 m layer. the following soil physical properties were measured: soil bulk density, macroporosity, microporosity, total soil porosity and soil water content at a tension of 100 hpa (field capacity). the spatial variability in the single semivariogram of these soil physical properties was higher and the range in no-tillage was smaller than in conventional tillage. on the other hand, the cross-semivariogram of soil bulk density and total porosity or field capacity indicated spatial co-relationships with lower spatial variability and higher ranges in no-tillage than conventionally tilled soils. the cross-semivariogram suggested that soil bulk density showed a spatial co-relationships with the other soil physical properties in both soil management systems studied.

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