Guava is a typical tropical and subtropical evergreen tree. It is warm and afraid of frost. When the temperature drops below 5 degrees Celsius in winter, it will be subjected to freezing injury. The leaves will become green and red and fall off. In severe cases, the branches are dry, the plants die, and the fruit rots and falls off. If early application of overwintering thermal fertilizer, rejuvenation of tree vigor, can significantly improve the ability of overwintering resistance to cold, to avoid freezing damage. Specific fertilization methods are as follows:

In late October and early November, the winter-warming fertilizer was applied, with high-quality organic manure and complete NPK fertilizer as the main fertilizer, and additional P and K fertilizers. The results of an annual tree, each strain applied to the system of artificial livestock and poultry manure 15 to 20 kg, NPK (15-15-15) potassium sulfate compound fertilizer 0.75 to 1 kg, superphosphate or calcium magnesium phosphate 1.5 ~ 2 kg, potassium sulfate 0.25 to 0.50 kg. Surround the canopy drip line, dig deep and wide ring grooves of 25 to 30 centimeters each, mix all the fertilizer thoroughly, apply to the ring ditch, cover the soil, cover the fertilizer, and then apply the fertilizer to each tree. 40-50 kilograms of clear water or biogas slurry or digested mature human or animal manure water shall be applied evenly to the soil covering the ring ditch. It is advisable to completely infiltrate into the soil without influx, so as to accelerate the dissolution and transformation of the fertilizer and provide the root system. Absorption and utilization, improve the effect of fertilizer.

In addition, it is also necessary to spray 0.2%-0.3% potassium dihydrogen phosphate, 500-600 times amino acid active liquid fertilizer mixture once every 7-10 days, or 800-1000 times phosphorus and potassium phosphate, 600-800 times as much as humus. Acid active liquid fertilizer mixture, continuous spraying 2 to 3 times.

When spraying, all branches and fruits inside and outside the canopy must be uniformly sprayed so that it is appropriate to start dropping with drops of water and supplement various nutrients from the leaves.

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