Papers

Summary

The soil resistance to penetration (RSP) is an important indicator of physical quality of the soil, to be directly related to the growth of the plants and easy determination. The aimed of this study is investigate the spatial variability of humidity and soil resistance to penetration in period dry and wet with the use of scaled semivariogram and determine the density minimum sample size for characterization of variability in soil cultivated with sugarcane The experiment was conducted in a Cambisol Haplic, being the points of collection of samples were established by means of a grid of 70 x 70 m, sampling at the crossing points of the grid using regular spacing of 10 to 10 meters. The RSP was measured at depths from 0.0-0.15, 0.15-0.30 and from 0.30-0.45 m and the humidity was determined at depths 0,0-0,45 m in period dry and wet. The data were analyzed with descriptive statistics and geostatistics. There was greater humidity and lower soil resistance to penetration in period wet, characterizing the relationship between these attributes. In the dry period there was greater variability in the data compared to the wet period, represented by the lower range and higher sampling density, based on the range of the semivariogram and coefficient of variation