Spatial variability of physical attributes in a typic haplustox in the eastern planes of Colombia

The objective of the present work was to determine the behavior of the spatial variability of the penetration resistance (RP), bulk density, soil density, total porosity and the sand, lime and clays contents, as well as the relation between these properties. The present study was conduced in Puerto López (Meta-Colombia). Soil samples were collected in a regular grid, comprising 42 points, spaced at separation distances of 25 m between points, for two depths (0,00 - 0,10 and 0,10 - 0,20 m). The RP was analyzed up to the depth of 0,42 m. The RP did not correlate with any property in the first depth. Between 0.10 - 0.20 m depth, the RP were correlated with the lime and sand contents. The RP semivariograms indicates no spatial correlation in both depths, possibly due to soil tillage practices, which modifies the superficial spatial structure, gradually inducing to soil homogeneity. The properties adjusted mainly to exponential and spherical semivariograms models. For 0,10 - 0,20 m depth, the properties presented nugget effect, without spatial correlation, except for the bulk density.

compaction; geostatistics; oxisol