The lack of calcium in the fruit of the grape fruit can cause the fruit to rot, brown, and the fruit to break away from the ear. Therefore, calcium spraying on the grapes before harvesting can increase the calcium content of the grapes, improve the quality and yield of the grapes, and increase economic benefits.
According to the author's test, the grapes can be sprayed with calcium from 1 month to 10 days before harvesting, and it is better to spray calcium nitrate. When calcium is sprayed in the berry phase, the more easily it is absorbed, the spray concentration is preferably 1%. Spraying 10 days before harvesting, the concentration should be 1.5%.
Calcium spray on grape leaves should be better before 10 o'clock in the morning and in the evening. On sunny days with high temperature and dryness, the concentration of calcium spray should be smaller. If it rains within 8 hours after spraying, it should be sprayed after the rain. once.
This article URL: Grapes improve fruit quality and use calcium nitrate
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