People who often buy fresh grapes may know that there is always a layer of "white frost" on the surface of grapes. Many people at first thought it was pesticide residue, in fact, not. The "white frost" on the skin of grapes is actually grape fruit powder, is a layer of powdered wax, is synthesized by the lipids in the fruit. Because it does not dissolve in water, it is difficult to wash off. But do not wash it is okay, because the fruit powder is not only harmless to the human body, but also has certain health functions. At the same time, fruit powder is also one of the important basis for testing the quality of grapes. So what is the specific function of grape powder? How to help grape powder? Let's take a look.

The role of grape powder

1, first of all, it can play a protective role on the grape fruit, on the one hand, can avoid excessive evaporation of fruit water, on the other hand, it also has hydrophobicity, can effectively reduce the occurrence of fruit cracking.

2, fruit powder can improve the storage and transportation of grapes, reduce the occurrence of post-harvest diseases.

3, fruit powder is one of the standards for judging the appearance and quality of grapes. For example, red grapes classification standard has a description of fruit powder, belongs to the color category. Fruit powder appearance is complete, uniform, is a first-class fruit.

Grape powdering method

1, first of all, to reasonably control production and prosperity, while doing a good job of flower thinning and fruit thinning. In addition, the summer should pay attention to the retention of tips and strengthen the management of flowers and fruits.

2, fertilization should be scientific and reasonable. It can increase the amount of organic fertilizer application, in the growing period can also be combined with the application of humic acid, thus improving the nutrition of the tree and help the growth of grape powder. In addition, attention should also be paid to water management during the reproductive period, such as no irrigation during the flowering period, frequent small amounts of irrigation in the late stage, and timely maintenance of soil water demand.

3, the supplementation of trace elements also need special attention. For the young fruit of grapes, special attention should be paid to the supplementation of calcium, magnesium, zinc and other trace elements, which is conducive to the formation of grape fruit powder. Grape color change period should increase the application of phosphorus fertilizer and medium micronutrient fertilizer. Spray high phosphorus and high potassium foliar fertilizer to promote the application of flour, discoloration and sugar.

4, pay attention to the scientific use of drugs. After fruit expansion, should not use or less use of emulsified oil and poor quality powder, reasonably reduce the number of medication. If you need to spray during the discoloration, it is recommended to use a good atomization effect of the atomizer to reduce pesticide residues.

5, pay attention to the method and time of bagging, especially outdoor grapes. If the fruit powder is not good, it can be bagged in advance.

Overall, grape powder is very important to grape fruit, it can play a very obvious role, is one of the direct reflection of the economic value of grapes. Therefore, we can summarize the above methods to help grapes more popular with consumers.