Scientific calcium supplementation to improve Fruit quality of Grape

Grape calcium deficiency will cause reverse curl of leaves, dark green new leaves, serious increase of grape fruit cracking rate, aggravation of grape fruit shrinkage disease and other physiological diseases, decreased fruit firmness and poor storability, so calcitonin should be supplemented in time in the process of grape growth. Grape calcium absorption peak in 1-3 weeks, coupled with the recent cloudy and rainy weather in Chongqing, grape calcium supplement should be a combination of spraying and soil application.

Spraying calcium fertilizer should be carried out during the expansion period of young fruit, that is, from 1 week after flowering to the hard core stage, it should be used continuously for 2-3 times with an interval of 7-10 days. Calcium fertilizer should be water-soluble, high concentration and easy to absorb such as chelated calcium, and no wind or low wind should be selected when spraying. Fine spray to the back of the leaves, focusing on the young parts of inflorescences and ears. In order to improve the firmness and marketability of grapes, calcium fertilizer should be sprayed once 10-15 days before grape picking.

Soil lime can not only supplement calcium but also disinfect. It is generally used when clearing the garden in winter, and can be used again after the grape flower. Spread the lime cover between the grape rows, then plough it, using 50 kg per mu.