VARIAÇÃO ANUAL DE NUTRIENTES EMMachaerium aculeatum RADDI SOB PASTAGEM

Abstract

This work objectified to study the nutritional composition of the espinheiro (Machaerium aculeatum Raddi.), in dry and rainy season under pasture of Brachiaria decumbens Stapf in the conditions of Itambé, Pernambuco, Brazil. The experiment was carried out at Experimental Station of Itambé, of the IPA. It was identified 20 trees of the specie in the pasture, in which were realized eight collections of leaves and twigs (diameter<0.5 cm), half at the dry period and half at the rainy period. It were determinate the dry matter (DM), crude protein (CP), neutral detergent fiber (NDF), acid detergent fiber (ADF), potassium (K), nitrogen (N), calcium (Ca), magnesium (Mg), and phosphorus (P) contents. The CP, ADF, K, N, Ca and Mg contents were larger (P<0.05) in the rainy season, with average 14.7; 39.7; 1.7; 2.3; 1.1 and 0.5%, respectively. NDF and P contents had not differed between the seasons, with average 49.1 and 0.1%. The espinheiro presents similar chemical composition to the one of other legumes forages. The season of the year exerts influence on the chemical composition of the espinheiro.