It can be carried out from 1 month to 10 days before harvesting, and it is advisable to spray calcium nitrate. Calcium is sprayed during the berry phase and is more easily absorbed. The spray concentration is preferably 1%. Spraying 10 days before harvesting, the concentration should be 1.5%. Spraying calcium fertilizer on grape leaves should be carried out before 10 o'clock in the morning and in the evening. On sunny days with high temperature and dryness, the spraying concentration should be smaller. If it rains within 8 hours after spraying, it should be sprayed again after the rain. .
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