EFFECT OF LIME AND GYPSUM ON CALCIUM AND ALUMINUM AMOUNTS OF THE COMPACTED LAYER OF A DARK RED LATOSOL

This study was conducted at the laboratory of the Universidade Federal de Uberlandia, MG state, Brazil, to evaluate the influence of soil co mpaction and different gypsum + lime levels on some chemical propertie s of the compacted layer. Three overlapping PVC rings formed a column with external soil layers of 0.5 dm depth without compaction, and the central ring consisted of a layer with different compaction levels. Tr eatments were conducted in a factorial arrangement with three liming ( 0.0; 2.031 and 4.062 t ha(-1)), five gypsum (0.0; 0.508; 1.016; 1.524 and 2.032 t ha(-1)), and five compaction (1.10; 1.25; 1.40; 1.55 and 1 .70 kg dm(-3)) levels. It was observed that both compaction and gypsum levels increased Ca2+ levels and reduced Al3+ levels. However, these effects depended on liming levels combined with gypsum.