Pre-flowering top dressing: about 10 days before germination, apply quick-acting nitrogen fertilizer, and plum saplings germinate in early spring. A large amount of fast-acting nitrogen fertilizer needs to be applied before flowering to meet the fertilizer requirements for flowering and germination. Topdressing after flowering: The petals fall off after pollination, and the young fruit of plum saplings begin to grow. At the same time, the sprouts also entered the peak of growth. In order to avoid competition with each other, quick-acting nitrogen, phosphorus and potassium fertilizers can be applied to reduce physiological fruit drop, improve fruit setting rate, and promote the simultaneous growth of young fruit and new shoots of plum seedlings.