Hanfu apple should be fertilized three times a year. The first time before and after germination, nitrogen fertilizer is the main factor. The second time in flower bud differentiation and fruit enlargement period, phosphorus and potassium fertilizers are dominant, supplemented by nitrogen fertilizer; the third time in fruit growth. Potash fertilizer is the main fertilizer. The amount of fertilizer is determined by the local soil conditions and fertilization characteristics. As a result, the tree generally needs to recover 1.0 kg of pure nitrogen, 0.5 kg of pure phosphorus and 1.0 kg of pure potassium for every 100 kg of apples produced. The top dressing method is to open the ditch under the canopy, and the ditch depth is 15 to 20 cm. The last topdressing was carried out 30 days before the fruit harvesting period. Foliage top dressing. 4-5 times a year, generally 2 times in the early stage of growth, with nitrogen fertilizer as the main; 2-3 times in the later period of the main phosphorus and potassium, can make up the application of trace elements required for the growth and development of fruit trees. Common fertilizer concentration: urea 0.3% ~ 0.5%, potassium dihydrogen phosphate 0.2% ~ 0.3%, borax 0.1% ~ 0.3%. The last foliar fertilizer was taken 20 days before fruit harvest.
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