SPATIAL VARIABILITY OF ATTRIBUTES Fi ?? LATOSOL MUSICIANS IN A DIRECT AND PREPARATION PLANTING UNDER CONVENTIONAL FARMING IN SOYBEANS IN SAVANNAH

Abstract

The objective of this study is to evaluate the spatial variability of physical attributes in an Oxisol under no-tillage and conventional tillage soybeans in the cerrado, under the aegis of classical statistical and geostatistical analysis of the data. The experiment was conducted in two plots at sampling points defined, according to a mesh size of 40 x 55 m, totaling 44 points. Descriptive analysis was performed to verify the presence of outliers and normality of the data, and then the spatial analysis, according Geostatistical techniques for analysis of semivariograms. All physical attributes showed significant difference in the same depth between managements except bulk density and total porosity at the depth of 0.20-0.40 m. In Conventional Tillage, most attributes presented spatial dependence structure between moderate and strong, except: macroporosity in the 0-0.10 m depth, bulk density and microporosity of 0.10-0.20 m, the preparation microporosity and macroporosity of 0.20-0.40 m. In tillage, the total porosity of 0.10-0.20 m, bulk density and macroporosity in the depth of 0.20-0.40 m, and microporosity in three depths show no spatial dependence. The soil for planting of soy influenced attributes: density, microporosity and total porosity in the depth of 0-0.10 m, with the same spatial pattern of the spherical model with adjustment.