果树施肥中，选择最佳的施肥时机并将肥料施于最佳部位，可取得良好的施肥效果。 施肥有4个最佳时期：（1）花前追肥：花前应适量追施速效肥。（2）花后追肥：这时追肥可使新梢生长健壮、叶面积扩大、光合生产率提高并减少生理落果。（3）花芽分化前追肥：此时追适量氮、磷 Fruit tree fertilization, choose the best timing of fertilization and fertilizer applied to the best site, can achieve good fertilization effect. Fertilization has four best times: (1) top dressing before flowering: flowers should be topdressing effective fertilizer. (2) Flowering topdressing: topdressing at this time can make shoots grow robust, leaf area, photosynthetic productivity and reduce physiological drop fruit. (3) topdressing flower buds before dressing: catch up at this time amount of nitrogen, phosphorus