油菜是喜磷作物,土壤含磷小于5％时,菜苗根系生长不良,叶片变小,分枝少,后期果夹少,籽粒不饱满,产量降低。因此,油菜夺高产,施磷肥尤为重要。一、磷肥应早期追施。油菜对磷肥的吸收利用率以早期最强,在苗期和栽后8叶前施效果极为明显。因此,油菜施磷最佳期是2叶期到8叶期。二、施冬不施春。油菜生长初期吸收的磷在以后各个生育阶段可反复渗与新组织形成和代谢作用。 Rape is a phosphorus-like crop. When soil phosphorus content is less than 5%, the root growth of seedlings is poor, the leaves become smaller, the branches are less, the fruit clip is less in the later period, the grains are not full, and the yield is reduced. Therefore, rapeseed high yield, phosphate fertilizer is particularly important. First, phosphate should be pursued early. Rapeseed uptake and utilization of phosphate fertilizer to the strongest in the early, in the seedling and transplanting 8 leaves before the effect is extremely obvious. Therefore, the optimum period of rape phosphorus application is from 2 leaves to 8 leaves. Second, winter does not apply spring. The phosphorus absorbed in the initial stage of rapeseed can be repeatedly infiltrated with new tissue formation and metabolism in all subsequent stages of growth.