Variabilidade espacial da resistência à penetração em área de sistema plantio direto

Abstract

The increased use of agricultural machines and no soil disturbance by the use of tillage system can cause increased soil compaction. The objective was to evaluate the spatial variability of soil mechanical resistance to penetration (RP) under no-tillage area, considering the average value and the maximum value of RP in each layer of soil evaluated. Data collection occurred in the municipality of Dourados, MS, specifically at the Experimental Farm UFGD. It used an automated electronic penetrometer to a depth of 0.40 m using a sampling grid with 40 points equidistant from each other 45 m. The average soil resistance to penetration in each point was obtained for three replicates within a radius of five meters from the central point. Subsequently collecting the data were analyzed using descriptive statistics and geostatistics for tailoring spatial variability maps. The results showed that there is spatial variability in the area, and that the adoption of no-tillage and machinery traffic in the area favored the emergence of intermediate values of RP, in most of the area. Using the maximum value of the layer, rather than the average must be used to allow better identification of where it should be done scarification / subsoil.