Abstract
The objective of this study was to evaluate the response of sources and levels of nitrogen on productivity of Brachiaria brizantha. Marandu at conditions of the Coastal Table lands of Piaui. The work was conducted to field, from May to July 2013 at the Experimental Station of Embrapa Meio-Norte, located in the city of Parnaíba, Piauí. The treatments consisted of the combination of two nitrogen sources (ammonium sulphate and urea) and three levels of nitrogen 19.56; 39.12 and 58.68 kg/ha/cut corresponding to 170, 340, 510 kg/ha/year, according to the randomized complete block design with three replications. Three cuts with an interval of 42 days each. Nitrogen fertilization positively influenced the yield of total dry matter. Leaf/stem ratio and the efficiency of nitrogen utilization responded negatively to increases nitrogen.
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