ASU mainly contributed to the increase in utilization ratio in seeds. The distribution ratio of nitrogen from base fertilizer in rape plant organs had the following order; seeds>leaves>stems(or pod shells)>roots.

• ASU主要提高了籽粒对肥料氮的利用率,基肥氮在油菜各器官中的分配顺序是:籽粒>叶>荚壳(或茎)>根。