Variabilidade espacial da taxa de infiltração de água no solo.

Abstract

The humanity, trying to enlarge agricultural production, has led some regions to environmental degradation, causing groundwater contamination with hazardous chemicals, transported through water infiltration or erosion. The soil water infiltration rate is correlated to this situation and, aiming to study its spatial variability, values at 103 points, spaced 3 m, have been analyzed, after obtaining the experimental values through double ring infiltrometer. The experiment was carried at a clayey Rhodic Hapludox, submitted to no-tillage management system during 8 years. It was met an average equal to 180,90 mm hr-1, considered a medium value, indicating that the management system improved the soil physical quality. The sampled grid proportioned to detect the spatial dependence, pointing out that the range of spatial dependence was 20, 09 m and the nugget effect 0,866, indicating strong spatial variability.