Answer: It should be the lack of boron in fruit trees. It is possible to combine basal fertiliser with borax or boric acid before flowering in spring or autumn. The amount of fertilizer varies depending on the size of the tree. Each tree is given 150 to 200 grams of borax, and 50 to 100 grams of borax is applied to the tree. The amount should not be too much. Immediately after fertilization, water should be applied to prevent the occurrence of fertilizer damage. It can also adopt the method of foliar spraying. Before flowering, it sprays 0.3%～0.5% borax solution once at the flowering stage and after flowering. The concentration of the solution is 1%～2% before germination and the germination to flowering period is 0.3%～ 0.5%.
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