关键词: 青贮玉米, 青贮玉米, 收获时期, 产量

Abstract:

A field plot experiment was conducted to study the responses of grain yield and stem, leaves parameters of ‘Xiang Zayou 763’ (a new hybrid variety of winter oilseed rape with high quality) to 4 levels of application fertilizer under planting density conditions of high (375 thousand plants/hm2), middle (225 thousand plants/hm2) and low (75 thousand plants/hm2). The results showed that grain yield, siliques per plant, seeds per pod, weight of thousand seeds, diameter of rootstalk at wintering and flowering stages, numbers of green leaf per plant at wintering stage, numbers of green leaf on main stem per plant at flowering stage, length and width of the biggest leaf at wintering stage, length and width of the first leaf without handling at flowering stage increased with fertilizer application amount under 3 kinds of planting density, but the degrees of their increases were different from planting densities. The increased degrees of grain yield, diameter of rootstalk at wintering stages were biggest under the middle planting density, the other indexes heavily increased under low planting density, while under high planting density, the increased degrees of all indexes were small. Therefore, grain yield, diameter of rootstalk at wintering stages at treatments of middle planting density and high application N level increased heavily (N, P2O5, K2O and B were 240, 120, 210, 1.2 kg/hm2), the increased degrees of other indexes were highest at the treatments of low planting density and high application N levels.