Abstract
An experiment with pearl millet (Pennisetum glaucum) cv ADR-300 under nitrogen doses (0, 50, 100 and 150 kg.ha-1) at two residual height cuts (0.20 and 0.25 m) was carried out to evaluate dry matter production and chemical composition. The experiment was carried out at Universidade Federal de Goiás. The experimental design used was randomized blocks in a 4 x 3 factorial arrangement, with three replications. Dry matter production (DMP), dry matter content (DM), crude protein (CP), acid detergent fiber (ADF) and neutral detergent fiber (NDF) were evaluated. The DMP differed (P<0.05) among the N doses and cuts. DM content decreased as N doses increased. The addition of N doses promoted a rise of CP content at all the cuts. CP content decreased with the cuts succession. The NDF tenors differed (P<0.05) with the succession of the cuts at both heights. The ADF values (P<0.05) differed in function of the addition of N doses and the succession of the cuts. Pearl millet showed production and chemical composition variation in the performed treatments, thus, it is recommended for animal feeding that this forage plant is used at the residual height of 0.25 m and with application of a N dose of 150 kg.ha-1.KEYWORDS: crude protein; dry matter production; nitrogen; Pennisetum glaucum; residual height.
Highlights
RENDIMENTO FORRAGEIRO E COMPOSIÇÃO BROMATOLÓGICA DE MILHETO SOB ADUBAÇÃOALZIRA GABRIELA DA SILVA1, OSCAR LOPES DE FARIAS JÚNIOR1, ALDI FERNANDES DE SOUZA FRANÇA2, ELIANE SAYURI MIYAGI2, LEONARDO CÂNDIDO RIOS3, CARLOS GARCIA DE MORAES FILHO3, JORGE LUÍS FERREIRA1
O milheto ou pasto italiano (Pennisetum glaucum) é uma planta anual, de crescimento cespitoso e ereto, com ciclo de cerca de 130 dias
A fertilização nitrogenada alterou a produção de massa seca e composição bromatológica determinada no milheto forrageiro cv ADR-300; contudo, em função dos maiores teores de proteína bruta determinados, recomenda-se para a alimentação animal a utilização dessa planta forrageira na altura residual de 0,25 m e com aplicação da dose de 150 kg.ha-1 de N
Summary
ALZIRA GABRIELA DA SILVA1, OSCAR LOPES DE FARIAS JÚNIOR1, ALDI FERNANDES DE SOUZA FRANÇA2, ELIANE SAYURI MIYAGI2, LEONARDO CÂNDIDO RIOS3, CARLOS GARCIA DE MORAES FILHO3, JORGE LUÍS FERREIRA1. ADR-300 sob doses de nitrogênio (0, 50, 100 e 150 kg.ha-1) em regimes de cortes em duas alturas residuais (0,20 e 0,25 m), para se avaliar o potencial de produção e composição bromatológica da massa seca. Avaliou-se a produção de massa seca (PMS), teor de matéria seca (MS), proteína bruta (PB), fibra em detergente neutro (FDN) e fibra em detergente ácido (FDA). Houve decréscimo no teor de PB com a sucessão dos cortes. Os teores de FDN e FDA diferiram (P
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