密度、施氮量对油菜产量及其产量构成因素影响的旋转回归分析

运用二因素五水平回归正交旋转组合设计，进行施肥量、密度对油菜产量及产量构成因素影响的研究。结果表明。在本试验范围内，施肥量和密度对油菜单株有效角果数和产量均有显著的影响，对单株有效角果数的影响是密度大于施肥量，而对产量的影响则是施肥量大于密度；单株有效角果数的最佳组合为施肥量以纯氮227．0kg／hm^2、密度9．4万株／hm^2，产量的最佳组合为施肥量以纯氮235．7kg／hm^2、密度10．6万株／hm^2；当控制施肥量（纯氮）、密度分别为214．4—256.9kg／hm^2、10．1-11．1万株／hm^2时，油菜产量可达3000kg／hm^2以上。施肥量和密度对于油菜每角粒数和千粒重的影响不显著。

Analysis of Rotational Regression on Yield and Economic Characters of Rape in Different Fertilizer and Density

Using quadratic rotational regression combination design to study the influence on yield and economic characters in different fertilizer and density of the rape, the result showed that the influence of density and fertilizer on yield and active silique per plant were significant but the quantity and weight of seed, while the influence of density on active silique per plant was higher than that of fertilizer but on yield was contrary. The result also gave the best combination of density and fertilizer to the active silique per plant and yield which indicated that the yield would reach to 3000kg/hm^2 if control the nitrogen in the rang of 214.4 to 256.gkg/hm^2 and density in the rang of 101 to l ll thousands individual per hm^2.