Calcium deficiency in grapes causes the leaves to curl in the opposite direction, the new leaves are dark green, the grape cracking rate is severely increased, the physiological diseases such as grape shrinkage disease are aggravated, the fruit hardness is decreased, and the storability is poor. Therefore, calcium should be added in time during grape growth. Prime. The peak of calcium absorption in grapes is 1-3 weeks. In addition, the recent rainy and sloppy weather in Chongqing area should be combined with spraying and soil application.
Spraying calcium fertilizer should be carried out during the expansion period of young fruit, that is, 1 week after the flowering to the hard core stage, continuous use 2-3 times, interval 7-10 days, calcium fertilizer requires water solubility, high concentration, easy to absorb such as chelated calcium Class, choose no wind or less windy weather when spraying, fine spray to the back of the blade, focus on spraying the inflorescence, the young part of the ear. In order to improve the hardness and commerciality of the fruit, the calcium fertilizer should be sprayed once every 10-15 days before harvesting.
The lime applied to the soil can be sterilized not only by calcium supplementation, but also when it is cleared in the winter, and can be applied once again after the grape flower. Spread the lime cover between the rows of grapes, then plow it, using 50 kg.
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