Use these tips to increase the sweetness of grapes.

1. Fertilization and sweetening

(1) The application of quick-acting phosphate fertilizer or potassium fertilizer in the growth period of grape fruit can promote the increase of sugar content in the fruit. Through experimental research, the sweetening effect of phosphate fertilizer is the most obvious, followed by potassium fertilizer, and nitrogen fertilizer is used to reduce the sugar content of the fruit during the growing period.

(2) The combined use of nitrogen, phosphorus and potassium fertilizer will have a mitigating effect on the reduction of the sugar content of fruit by nitrogen fertilizer; adding organic fertilizer while applying phosphorus and potassium fertilizer will increase the sweetening effect of phosphorus and potassium fertilizer. Therefore, pay attention to increase the application of phosphorus and potassium fertilizers during the growth period of the fruit, and grasp the amount of nitrogen fertilizer. It is best to add organic fertilizer while applying phosphorus and potassium fertilizer to improve its effect.

(3) Spraying 800-1000 times of the fruit lovers potassium dihydrogen phosphate or 4% ~ 6% plant ash leaching liquid during the fruit expansion period can improve the sweetness of grapes.

2. Sweeter management

By controlling the yield, the sugar content can be effectively improved. In the spring, the new shoots germinate, first wipe the buds to fix the branches, and generally leave one or two annual shoots for a fruiting branch. When the grapes are flowering, topping 11-12 leaves; 6-7 leaves in the secondary shoots for the second topping, the second shoot grows, and 1-2 leaves are left for the third topping, after three times Topping, the result leaves about 20 leaves, which not only satisfies the fruit growth, but also makes the grape sweet.

Use these tips to increase the sweetness of grapes.

3. Other sweetening methods

(1) Spray 0.05% to 0.1% rare earth solution during the period when the grape berries are softened. It needs to be prepared in water with a pH of less than 7, and adjust the pH to about 5 with nitric acid, hydrochloric acid or vinegar.

(2) During the period when the grapes become soft, spray hormones such as phosphorus-deficiency and auxin to increase the sweetness and color of the grapes.

(3) In the young fruit stage of the grape, spray the sweetener on the leaves of the grape. Sweetening liquid formula: 30 grams of borax, 1000 grams of sucrose, 5 grams of calcium chloride, add 50kg of water, dissolve. Spray 25-30kg per mu.

(4) When applying the grape fruit setting sweetening and swelling agent, pay attention to strengthening the management of water and fertilizer. When spraying, do not mix with pesticides and other agents, that is, use immediately after mixing, otherwise it will easily cause phytotoxicity.

Disclaimer: Some articles of this website are transferred from the Internet. If the legal rights of third parties are involved, please inform this website for processing. phone