2018-04-182018-04-182012FLORES, Rilner A.; URQUIAGA, Segundo S., ALVES, Bruno J. R.; COLLIER, Leonardo S.; MORAIS, Rafael F. de; PRADO, Renato de M. Adubação nitrogenada e idade de corte na produção de matéria seca do capim-elefante no cerrado. Revista Brasileira de Engenharia Agrícola e Ambiental, Campina Grande, v. 16, n. 2, p. 1282-1288, 2012.1415-4366e- 1807-1929http://repositorio.bc.ufg.br/handle/ri/14522The objective of this study was to investigate the effect of the application of N fertilizer and the cutting age on the dry biomass production of elephant grass. The experiment was performed with the variety Paraíso and planted in a Ferralsol in 2008 in the district of Gurupi (State of Tocantins). Four different rates of urea application were tested (0, 50, 100 and 150 kg ha -1 ) and harvests were made at 120, 150 or 180 days after germination (DAG) of the setts. The dry matter and total N accumulation were evaluated. Dry matter production increased with dose of N, the greatest effect being observed at 180 DAG. There was a linear increase in dry matter (R 2 = 0.75**) and N accumulation (R 2 = 0.96**) permitting a productivity of 34 t ha -1 of dry matter and an accumulation of 471 kg N ha -1 . The N utilization efficiency (biomass production per unit of applied N) increased with plant age. The higher efficiency of N use favored the quality of biomass production for energy production owing to the higher fibre content.porAcesso AbertoPennisetum purpureumBioenergiaBiomassaPennisetum purpureumBiomassBioenergyArtigo10.1590/S1415-43662012001200004