Adubação nitrogenada e idade de corte na produção de matéria seca do capim-elefante no Cerrado
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Data
2012-12-01
Autores
Flores, Rilner A.
Urquiaga, Segundo S.
Alves, Bruno J. R.
Collier, Leonardo S.
de Morais, Rafael F.
Prado, Renato de M. [UNESP]
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Editor
Universidade Federal da Paraíba (UFPB) Ccsa
Resumo
The 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 Paraiso 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.
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Pennisetum purpureum, biomass, bioenergy
Como citar
Revista Brasileira de Engenharia Agricola E Ambiental. Joao Pessoa Pb: Universidade Federal da Paraíba (UFPB) Ccsa, v. 16, n. 12, p. 1282-1288, 2012.