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Atualmente, a Brachiaria e o genero que domina as areas de pastagem no Brasil ocupando cerca de 200 milhoes de hectares. A adubacao nitrogenada nas pastagens formadas com esse genero e de suma importância, pois o nitrogenio no solo nao e suficiente para suprir as necessidades das forrageiras. O objetivo deste trabalho foi avaliar o efeito das fontes nitrogenadas de ureia e sulfato de amonio de forma individual e associada na producao de materia seca de Brachiaria brizantha cv. Marandu na regiao de Bonito, MS. O experimento foi conduzido em um Neossolo Regolitico, constituido de doses e fontes de Nitrogenio (N) aplicado em cobertura, em um delineamento experimental de blocos ao acaso com 4 repeticoes. As doses de N foram de 0, 30, 60, 120 e 240 kg ha-1 tendo como fontes a ureia (UR com 45% N), ureia encapsulada (UR + E com 30% de N), sulfato de amonio (SA, com 20% N) e a mistura delas (UR + SA) em uma proporcao de 50% de N de cada fonte. A eficiencia do uso do N pela forrageira proveniente da ureia encapsulada foi maior que das outras fontes de N testadas. A mistura de sulfato de amonio e ureia na proporcao de 1:1 na base de N possui eficiencia mais elevada em relacao as fontes sem a mistura, ate a dose de 185 kg ha-1. Palavras-chave: Forrageiras. Adubacao. Nitrogenio. Capim-Brachiaria. Abstract Brachiaria is a genus that dominates the pasture areas in Brazil occupying about 200 million hectares of pasture. The nitrogen fertilization on pastures is very important, because the nitrogen in the soil is not sufficient to meet the forager needs. The aim of this study was to evaluate the effect of nitrogen sources of urea and ammonium sulfate on an individual basis and associated with the dry matter production of Brachiaria brizantha cv. Marandu at Bonito region, MS. The experiment was conducted in a soil classified as Regolithic Neosol, consisting of doses and sources of nitrogen (N) applied in covers , in an experimental design of random blocks with 4 replications. The N doses were 0, 30, 60, 120 and 240 kg ha-1 having as sources urea (UR with 45% N), encapsulated urea  (UR + and 30% N), ammonium sulphate (SA, with 20% N) and mixing them (UR + SA) in a ratio of 50% N for each source. The use of encapsulated urea increases the efficiency of N use by Brachiaria brizantha CV. Marandu and the mixture of ammonium sulphate and urea in the ratio of 1: 1 on the basis of N increases their efficiency as the sources without the mixture. Keywords: Forages. Fertilization. Nitrogen. Grassland.

Fertilizantes Nitrogenados em Cobertura para Pastagem Marandu (Brachiaria brizantha) no Mato Grosso do Sul