Rendimento e qualidade de forragem de Panicum maximum Jacq. cv. Tanzania I em função da aplicação de superfosfato simples e sulfato de amônio

Abstract

The experiment was conducted in the surroundings of the Animal Science Department ofthe Universidade Federal de Lavras (UFLA), between november 1999 and may 2000 and consisted by an aplication of diferent quantities of simple superphosphate and ammonium sulphate upon in a experimental área oftanzania grass. Inicialy, a soil analisys ofthe experimental área was done; afler this, it was proceeded the liming, using the dolomitic calcareous and in the thirty day after this process, the soil received a basic fertilization ofN, P and K. The experimental design used was the randomized complete block, with 4 repetitions, in a 4 x 3 factorial scheme, with four doses of P (0, 50, 100 and 150 kg ha !ofP203) andthree doses of N (0, 100 and 200 kgha"]ofN). Three cuts were performed to a height of10 cm, with age of68, 48 and 48 days. After each plot's cut, the harvested forage was weighted and samples were kept (about 400 g) for evaluate the dry matter yield per ha and "in vitro" dry matter digestibility, CP, NDF, ADF, P, K, Ca, Mg and S in the DM. . Nitrogen fertilization increased the tiller height and dry matter yield, in quadratic form, and contents ofCP, ADF, P, K, Ca, Mg e S oftanzania grass in a linear form. Phosphorous fertilization also increased the tiller height, dry matter yield and contents ofCP, NDF and the "in vitro" dry matter digestibility oflinear or quadratic forms.