APPLICATION OF AGRICULTURAL GYPSUM ASSOCIATED WITH NITROGEN FERTILIZATION: AN APPROACH TO THE NUTRITIONAL STATUS IN PASTURE AND SOIL

Abstract

Brazilian soil presents serious problems with plant production, due to its low fertility and high acidity content, besides that the toxicity caused by the chemical element aluminum. To overcome these problems, agricultural gypsum is used to neutralize the action of aluminum and, together with the assistance of nitrogen sources, ensures greater forage productivity. The objective of this work was to recover a pasture area with the application of agricultural gypsum associated with nitrogen fertilization. The experimental design was in randomized blocks with four replications, in a 2x4 factorial scheme with 50 kg ha-1 of N in the form of ammonium nitrate and 50 kg ha-1 of N in the form of urea, plus four doses of agricultural plaster, of which: 0; 750; 1500 and 3000 kg ha-1 in pasture installed in Urochloa humidicola. The dose of 1884 kg ha-1 of gypsum provided the highest concentration of calcium when applied in conjunction with ammonium nitrate. For sulfur, a linear response was observed, regardless of the nitrogen source used. The use of urea significantly increased the nitrogen levels in the leaves. The application of gypsum, regardless of the nitrogen source, provided a linear response in the calcium and sulfur levels in the leaves.