Correção de Neossolo Quartzarênico com níveis de calcário no cerrado tocantinense

Abstract

Limestone, composed of Calcium Carbonate (CaCO3) is one of the main inputs used to correct soil acidity, used in different types of soil and crops, such as corn, soybeans and also in pastures. The objective of this work was to evaluate the ideal level of limestone and the dose of maximum technical efficiency for the correction of Quartzarenic Neossolo in the experimental unit of the Laboratory for Scientific and Technological Research of the Soil-Plant-Animal Relationship of the Center for Agricultural Sciences located in Araguaína - TO. The experimental design used was completely randomized, resulting in five treatments with five replications. The treatments were: control (0 t ha-1), 2 t ha-1, 4 t ha-1, 6 t ha-1 and 8 t ha-1. The evaluations included pH, Calcium (Ca), Magnesium (Mg), Potassium (K), Hydrogen + Aluminum (H+Al), Hydrogen (H) and Phosphorus (P) and calculated: base sum, cation exchange capacity, base saturation and aluminum saturation. There was variation in the chemical composition of the soil, changing the pH, Ca and Mg, H+ and Al values resulting from the application of increasing doses of lime during the experimental period. The results revealed the direct influence of lime doses on the chemical aspects of the soil. It was evident that the highest values of pH, Ca, Mg were observed in samples subjected to the highest doses of limestone. The initial pH of the soil was in the ideal range, so the application of the corrector served as a source for Ca and Mg, and with the analysis of the determining variables SB, CTC, T, V and m indicating the treatment with 6 tons of limestone as the maximum technical efficiency.