油菜属无限花序,花期长,具有边现蕾,边开花,边结果的特点,开花结角和种子发育时期,需大量养分供应,油菜每角胚珠虽然很多,但通常有1/4—1/3不能正常结子,主要是受精后因营养不足形成空秕粒。在施上苔肥的基础上,到花前再补施一次花肥,可使油菜多开花,多结果,增粒增重。笔者1986年在开县津 Rape is an infinite inflorescence, long flowering, with edge buds, edge flowering, edge characteristics, flowering knot and seed development period, the need for a large number of nutrients supply, although a lot of rape per horn ovule, but usually 1 / 4-1 / 3 can not normally knot, mainly due to lack of nutrition after fertilization to form empty tablets. In the application of moss on the basis of a pre-flowering to the flower before fertilizer, can rape more flowering, more results, increase grain weight gain. The author in Kai County in 1986