Papers

Spatial variability of chemical attributes in an Alfisol for variable rates of inputs in different forms of relief .

Author: Diogo M. Barbieri; José Marques Júnior; Gener T. Pereira

Keywords: precision agriculture, geostatistics, specific management.

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Summary

The precision agriculture implies an analysis of spatial variability of production factors and the inputs application of located form. There are several factors that cause spatial variability in soils; relief is one of the most important ones. The objective of this study was to analyze the spatial variability, the chemical attributes of the soil and the elaboration of maps necessity for input application of located form, in areas with different relief forms. Two parcels of one hectare each were delimited in areas with concave and convex shaped topography. A set of 242 samples were collected from each area at 121 points in depths of 0.00-0.20 m and 0.20-0.40 m. The data were submitted to the descriptive statistical analyses, geostatistics and interpolation for kriging. The convex area presented more spatial variability of the soil in relation the concave area. The adoption of precision agriculture made it possible to save approximately 25 kg ha -1 of P2O5 in the concave area.