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Produtividade e composição bromatológica de Panicum maximum cv. Mombaça sob irrigação e adubação azotada

2016; Sociedade de Ciências Agrárias de Portugal; Volume: 39; Issue: 1 Linguagem: Inglês

10.19084/rca14154

2183-041X

William Mochel Filho, Maria Socorro de Souza Carneiro, Alex Danilo Monte de Andrade, Elzânia Sales Pereira, Alberício Pereira de Andrade, Magno José Duarte Cândido, João Avelar Magalhães, Braz Rodrigues, Francisco José de Seixas Santos, N. de L. Costa,

Crop Yield and Soil Fertility

The effects of different irrigation levels and doses of nitrogen (N) on yield, nitrogen use efficiency (NUE) and chemical composition of Mombasa grass (Panicum maximum) were evaluated. The experimental design was randomized blocks in a 2x4 factorial, with three replicates, two water levels (50% and 80% of Class A pan evaporation, ECA) and four levels of N (200, 400, 600 and 800 kg / ha / year). The water depth applied showed similar behaviors regarding NUE, total dry matter yield (TDMY), leaves (DMYL) and stems (DMYS), and levels of neutral detergent fiber (NDF). The nitrogen fertilization influenced positively TDMY, DMYL and DMYS, however, decreased NUE. Crude protein (CP) of the leaves and stems were influenced by the interaction of blades irrigation x nitrogen fertilization. There was a linear effect of N on the PB. The levels of acid detergent fiber (ADF) had negative influence of greater water depth. Concentrations of ADF were reduced by nitrogen fertilization. Irrigation of 50% of ECA, associated with application of 800 kg N / ha / year, showed the best results, considering productivity, chemical composition and water savings.