Abstract

SILVA, A.G. et al. Proteins fractions of mombaça grass submitted to nitrogen doses at two cutting heights. Arq. Bras. Med. Vet. Zootec. [online]. 2009, vol.61, n.5, pp. 1148-1155. ISSN 0102-0935.  http://dx.doi.org/10.1590/S0102-09352009000500018.

The protein fractions of mombaça grass submitted to four nitrogen doses (0, 100, 300, and 500kg.ha^-1) at two cutting heights in dry and rainy periods were characterized and identified. A completely randomized block design, in 2x4 factorial scheme with four repetitions, was used. The crude protein (CP) and A, B₁, B₂, B₃, and C protein fractions of mombaça grass cut at 0.20 and 0.40m were evaluated by the Cornell Net Carbohydrate and Protein System. There was significant difference (P<0.05) for CP according to the nitrogen (N) dose. The CP percentage increased as the N dose increased, in rainy period, averaging around 10%. There was difference for CP in function of season and cutting heights. The B1 and C fractions did not significantly differ concerning N dose and cutting heights. The A + B1 fractions were higher in the dry period in both heights (P<0.05). The N dose and cutting heights influenced in protein fractions composition.

Keywords : mombaça grass; Panicum maximum; nitrogen composites; nitrogen fertilization.