Ecofisiologia da produção de azevém anual (BRS Estações) sob diferentes freqüências de desfolha.

Abstract

The purpose of this study was to evaluate the production of fodder, straw and seeds of a variety annual ryegrass (Lolium multiflorum Lam.) long cycle (BRS Estações) submitted many numbers of defoliation. The variety allowed six cuts (defoliation) with average amount harvested by defoliation 2.039,9kg DM ha-1 with the productive cycle duration of 216 days or 2.161,55 DD. The increase in fodder harvest was linear in relation to time with predominance of leaf blades until the fifth cut. The last cut was made in late November and also made possible the harvest 559 kg of DM ha-1 fresh leaves. The total fodder production was 15,5t DM ha-1. It was possible to obtain the highest seed harvest (1.423 kg ha-1) and by performing three fodder harvest (8.178kg DM ha-1). Nonetheless, as fodder cut running forward in time from, 1.000 DD, there was an asymptotic fall in yield seeds. Plant growth without defoliation intervention resulted in the largest straw at the end of the crop cycle (12,2 t de DM ha-1). However, as the use of grazing over time there was a linear decrease of the straw, with minimum value, resulting from six grazing uses of 1.688 kg DM ha- 1 . The maximum number of cuts provides raised fodder harvest with raised leaves participation. The execution of three defoliation does not affect seed production and enables high leaf harvest and the maintenance of significantly straw at the end of productive cycle of the crop