揭膜时间与施氮量对油菜产量影响的回归分析

Regression Analysis of Removing Time Film and Nitrogen Fertilizer on Rape Yield

采用二次饱和D-最优回归设计试验方法,研究油菜地膜覆盖栽培的揭膜时间与施氮量对油菜产量的影响。结果表明,揭膜时间、施氮量对油菜产量的影响均表现出先增后降的抛物线曲线,且前者影响大于后者,当控制揭膜时间在油菜移栽后59～63 d,施氮量每公顷254.3～356.3 kg范围内,油菜产量可达到每公顷4 000 kg左右,其最佳组合为栽后61 d揭膜,施氮量每公顷305.3 kg。

With the design of best regression of two factors, the experiment studied the influence of removing film time and nitrogen level on rape yield. The result showed that the influence of removing film time and nitrogen level on yield were significant which presented a trend of parabola curve. The yield would reach 4000kg per hm~ by controlling the removing time in the range from 59 to 63 days and nitrogen level in the range from 254.3 to 356.3 kg·hm^-2, and the best combination of both were 61 days and 05.3kg·hm^-2.