Spatial variability of physical attributes of a clayey latosol related to the grain yield of the crambe (Crambe abyssinica Hochst) culture

Abstract

The aim of this study was to determine, with the help of thematic maps obtained by kriging interpolation, the existence of relationship between spatial variability of soil density and soil resistance to penetration with crambe yield (Crambe abyssinica) under no-tillage system on clayey Latosol. The experiment was conducted in experimental area located in Cascavel-Parana, Brazil. The experimental grid was established in 100 × 100 m area, totaling 100 points, in which samples of soil density and soil resistance to penetration were collected in order to relate them to the productivity of the crambe culture. The values results showed that the soil density and soil resistance to penetration, in all studied layers (0 to 0.1, 0.1 to 0.2 and 0.2 to 0.3 m), did not present significant values of compressed areas. After analysis of the thematic maps, one could note that there was no relation between the soil density and soil resistance to penetration with respect to yield of crambe culture. Among the attributes studied in this work, the soil resistance to penetration in the layer of 0 to 0.1 m was the one that showed greatest relation to productivity to crambe. Key words: Energetic cultures, geostatistics, bulk density.