Attention should be paid to potassium application in the middle and later stage of grape growth.

Potash fertilizer is very important during the whole growth period of grapes, especially during fruit growth. Therefore, the grape is called "potassium" quality crop. Potash fertilizer can promote the hypertrophy and ripening of grape fruit, improve the variety and storage tolerance, promote the thickening growth and ripening of branches, and improve its cold resistance, drought resistance, high temperature resistance and disease and insect resistance. During the period from fruit setting to fruit color conversion, according to the soil fertility of the orchard, 5kg potassium sulfate per mu of vineyard was applied, or potassium dihydrogen phosphate solution was sprayed on the leaves, once every 7 days and 3 times in a row. It plays a significant role in promoting grape enlargement, early ripening, accelerating vine aging and improving grape resistance. At the same time, it can also significantly inhibit grape anthracnose, black pox and other major diseases. Foliar fertilizer spraying should be carried out before 9: 00 a.m. and after 5: 00 p.m., and high temperature at noon should not be sprayed. Leaves should be sprayed evenly on both sides, with 60 kilograms of fertilizer spray per mu.