Aplicação superficial de calcário e gesso em solos arenosos: atributos químicos do solo e qualidade da pastagem U. brizantha cv. Piatã

Abstract

The current study had as objectives to evaluate the effects on the soil and the plant of U. brizanta cv. Piatã grass after lime and gypsum surface application. The experiment was carried at Sítio JC in Mirante do Paranapanema – SP with randomized block design in a 2x4 factorial scheme, with 2 limestone doses (0 and 1.408 Kg ha-1) and 4 gypsum doses (0, 500, 1.000 and 2.000 Kg ha-1) with 4 replications totaling 32 plots. Limestone and gypsum were applied on December 18, 2017 and 6 grass cuts and 2 soil samplings were carried out throughout the experiment. The chemical attributes of the soil, the content of macronutrients in the plant tissue, the chemical composition (PB, NDT, NDF, ADF, Cellulose, Hemicellulose and Lignin) and pasture productivity were evaluated. The interaction of limestone with gypsum increased the content of K and S in the soil in the subsurface and increased the leaf content of Ca and S in the pasture. Limestone increased Ca, S, pH, V% and reduced H + Al in the topsoil, increased the Mg leaf content, increased productivity and nutritional value of pasture. Gypsum increased the S, K content and reduced the Mg in the soil, and increased the S content in the leaf tissue and the productivity of the pasture.