Mapeamento da necessidade de calagem e avaliação do efeito pós-aplicação com uso de técnicas de geoprocessamento

Abstract

MARTINS, R. A, Mapping Lime Requirement and Evaluating Post-Application Effects Using Geoprocessing Techniques. Bambuí: IFMG Campus Bambuí, 2026, 36 p. Soil acidity correction is an important factor for agricultural productivity, and the use of geotechnologies allows this practice to be managed more accurately. The aim of this study was to map the lime requirement (LR) and evaluate the effects of lime application in an experimental area at Fazenda Varginha, located on the IFMG campus in Bambuí, Minas Gerais, Brazil, using geoprocessing techniques. The methodology consisted of collecting 20 soil samples before lime application and another 20 samples 90 days after applying a single, uniform lime rate. The soil chemical data were used to calculate the lime requirement using the base saturation method, and spatial distribution maps were generated through kriging interpolation. The results showed that liming increased the average soil pH from 5.90 to 6.04 and reduced the spatial variability of soil acidity, as indicated by the decrease in the standard deviation from 0.35 to 0.14. However, the spatial analysis revealed that the fixed-rate application resulted in areas with insufficient correction and others with excessive lime application. In addition, the target base saturation (V%) of 80% was achieved only in part of the study area, indicating that a single uniform application did not adequately meet the soil’s variable correction requirements. It was concluded that the use of geoprocessing is essential for identifying the spatial variability of soil properties, demonstrating that variable-rate lime application could provide greater technical efficiency, reduce costs, and minimize environmental impacts compared with conventional management.