Produção e Composição Químico-Bromatológica de Gramíneas Tropicais Submetidas a Dois Níveis de Irrigação

Abstract

This study aimed to evaluate the production and chemical composition of five forage species subjected to two irrigation levels. The forages were Urochloa brizantha cv. MG-5, Andropogon gayanus, Urochloa humidicola, Digitaria umfolozi and Panicum maximum cv. Aruana, submitted or not irrigation, with four replications. The experimental design was in randomized blocks in a 5 x 2 factorial scheme. A significant interaction (P<0.05) in DM production, in LB and content in the leaf blade:stem, between species and irrigation levels. There was a significant difference (P<0.05) in TDN content, between species and irrigation levels. Significant interaction (P<0.05) in the level of TN between fodder and irrigation levels was observed. Forages had higher levels of TN level without irrigation. Forages had higher content of INND and INAD in the irrigated area. Irrigation increased the yield per area and percentage of LB, irrigation decreases the level of T and increased the percentage of nitrogen complexed forage cell walls (INND and INAD).