A: Need, apples are deficient in calcium, prone to bitter pox disease, cork stem disease, acne spot disease, heart decay fruit, water heart disease, cracked fruit and so on. Apple orchards, which are often applied with nitrogen fertilizer, are most prone to calcium deficiency. May is the most important period of calcium supplementation in the tree. Calcium is mainly transported into the fruit within 4 to 5 weeks after flowering. Because the soil calcium is easy to be fixed, the effect is poor. Therefore, the leaf surface calcium should be mainly used. Calcium preparations such as calcium nitrate and calcium chloride can be used. In the morning and evening, the tree is sprayed and sprayed. ~3 times, two times 7 to 10 days apart. Note that the front and back sides of the leaves and the young fruit are sprayed.

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