Method for delaying leaf falling of plum tree in autumn and winter

The invention particularly discloses a method for delaying the leaf falling of a plum tree in autumn and winter. The method mainly comprises the following steps: (1) preparing a delayer, wherein the delayer for maiden trees comprises 25% of biogas slurry, 0.3% of monopotassium phosphate, 0.05% of spinetram and 0.2% of a high-fat membrane, and the delayer for a full-grown tree comprises 25% of biogas slurry, 0.3% of urea, 0.05% of spinetram and 0.2% of a high-fat membrane; and (2) spraying the delayer at different periods, namely, spraying the delayer for the first time after plum fruits are harvested within 10-15 days, spraying the delayer for the second time after the first-time delayer spraying for 15-20 days, and spraying the delayer for the third time after the second-time delayer spraying for 30-45 days. By adopting the method, the fertilizer and pesticide utilization rate can be increased, and the 'medicine-fertilization integration' is realized. The method shows the good interaction synergy; the fertilizer efficiency is improved by 8%-15%; the pesticide effect is improved by 22%-30%; the problem of natural mutual contact and reduction of pesticides in use with the fertilizers is overcome.