揭膜时间·密度对油菜产量的影响

Study on the Effect of the Removal Time of Plastic Film and Planting Density on Rape Yield

运用二因素饱和D-最优回归设计,研究了揭膜时间、密度对油菜产量的影响。结果表明:密度与揭膜时间均对油菜产量产生影响,其影响大小为密度>揭膜时间>互作效应;随着揭膜时间的推迟和密度的增加,产量均表现出先增加、后减少的抛物线变化趋势,两者的最佳组合为栽后44d揭膜、密度11.75万株/hm2;当控制揭膜时间在移栽后42～47d,密度在11.1万～12.3万株/hm2范围时,油菜产量可达4400kg/hm2以上。

With the design of best regression of two factors, the experiment in the influence of the removal time of plastic film and planting density on rape yield was conducted. The result showed that the influence of the removal time of plastic film and planting density on rape yield was significant, which presented a trend of parabola curve. The yield would go beyond 4 400 kg/hm^2 when the removing time was controlled in the range from 42 to 47 days and the planting density was in the range from 111 000 to 123 000 plants/hm^2. And the best combination of both was 44 days and 117 500 plants/hm^2.