Influence of density and different proportions of N, P and K on Rape yield with alluvial mud soil was investigated using orthogonal test. The results showed that yield per seedling negatively related to density , conversely, the yield per unit positively related to density. The rape yield increased by 322 kg/hm2 from the experiment using 82. 8 kg/hm2 carbamide in comparison with that of 27. 6 kg/hm2 carbamide. P and K fertilization gave nearly no influence on yield. Length of main inflorescences, primary branches, secondary branches, pods per plant, seeds per pod and the per-plant yield all decreased with the increase of density, however the 1000-seed weight had no changes. Pods per plant and the per-plant yield under high nitrogen were superior to that using low nitrogen.%采用L8(4×24)正交试验设计,研究潮泥田中不同种植密度和氮、磷、钾用量对油菜产量的影响.结果表明:单株产量与密度呈直线负相关,单位面积产量与密度呈直线正相关；施用尿素82.8 kg/hm2比施用尿素27.6kg/hm2增产322 kg/hm2,施用磷、钾肥与否对产量基本没有影响.主花序长随密度的增加而缩短,有效分枝高随密度增加而升高,一次分枝数、二次分枝数、单株有效角果数、角粒数和单株理论产量均随密度增加而减少,千粒重的变化不大,高氮肥区比低氮肥区的单株有效角果数和单株理论产量增加较多,株高和有效分枝高也有所增加.
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