INCUBAÇÃO DE CALCÁRIO FINAMENTE MOÍDO E CARACTERÍSTICAS QUÍMICAS DO SOLO SOB CULTIVO DE SOJA E MILHO

Abstract

The chemical changes in the soil and the behavior of soybean and corn resulting from the application of doses of finely ground calcitic and dolomitic limestone were studied. The experiment was carried out in 10 L pots in a 2x4 factorial scheme with four replications, whose treatments consisted of two limestones (calcitic and dolomitic) and four doses: 0.0; 3.0; 6.0; 9.0 Mg ha^-1. The soil was incubated and sampled at 90, 200 and 300 days. At 90 days of incubation, the soybean was sown and harvested at the end of the cycle. Next, corn was sown, which was also harvested. The results showed that the increasing doses of lime influenced all soil and plant variables with a linear or quadratic effect; the levels of calcium, magnesium, their CEC saturations and the Ca/Mg ratio were affected due to the higher content of each nutrient in the respective corrective and the application of finely ground limestone increased base saturation to values ​​close to the value calculated at the lowest doses. , not reaching the desired value only at the dose of 12 Mg ha^-1, reaching the reaction peak at 90 days, decreasing from this date.