Insufficient calcium content in grape fruit, especially in the peel, can cause undesirable phenomena such as brown rot and fruit detachment from the ear. The grape sprays calcium before harvesting, which can increase the calcium content of the grape fruit, improve the quality and yield of the grape, and increase the economic benefit.
The method is: spraying calcium from 1 month to 10 days before harvesting, and spraying calcium nitrate is preferred. The earlier the calcium germination is during the ripening of the grape berry, the easier it is to be absorbed, and the spray concentration can be relatively low; the closer the harvesting period, the higher the concentration should be. According to the author's test, the calcium concentration in the first month before harvesting is 1%, and the calcium spray in the first 10 days before harvesting is 1.5%. The grape leaf surface is sprayed with calcium, and the effect is better before 10 o'clock in the morning and in the evening. On a sunny day with high temperature and dryness, the concentration of calcium sprayed is smaller. It rains within 8 hours after spraying calcium, and it can be sprayed once after the rain.
The method is: spraying calcium from 1 month to 10 days before harvesting, and spraying calcium nitrate is preferred. The earlier the calcium germination is during the ripening of the grape berry, the easier it is to be absorbed, and the spray concentration can be relatively low; the closer the harvesting period, the higher the concentration should be. According to the author's test, the calcium concentration in the first month before harvesting is 1%, and the calcium spray in the first 10 days before harvesting is 1.5%. The grape leaf surface is sprayed with calcium, and the effect is better before 10 o'clock in the morning and in the evening. On a sunny day with high temperature and dryness, the concentration of calcium sprayed is smaller. It rains within 8 hours after spraying calcium, and it can be sprayed once after the rain.
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