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运用三元二次通用正交旋转组合设计研究密度、施氮量、施钾量对甘蓝型杂交油菜成熟期根冠比的影响，并建立相应的数学模型。结果表明，仅有施氮量的一次效应对根冠比的影响达到极显著水平。三因子对根冠比影响大小的顺序为氮肥＞钾肥＞密度。根冠比与产量间呈极显著负相关。
The effects of planting density, nitrogen application rate and potassium application rate on root-shoot ratio of mature rape in rapeseed (Brassica napus L.) were studied by using ternary quadratic universal orthogonal rotation combination design. The corresponding mathematical model was established. The results showed that only the first effect of nitrogen application on the root-shoot ratio reached a significant level. Three factors on the root to shoot ratio of the size of the order of nitrogen> potassium> density. There was a significant negative correlation between root shoot ratio and yield.