What are the functions of grape powder
The editor will explain the functions of grape powder and related knowledge, let's take a look together.
What are the functions of grape powder
People who often buy fresh grapes may know that there is always a layer of "white frost" on the surface of grapes. Many people initially mistake it for pesticide residue, but this is not the case. The "white frost" on the surface of grape skin is actually grape powder, a powdery wax synthesized from lipids in the fruit. Because it is not soluble in water, it is difficult to wash off. However, it doesn't matter if it is not washed, as the powder is not only harmless to humans but also has certain health benefits. At the same time, the powder is also one of the important bases for testing the quality of grapes. So what are the specific functions of grape powder? How to help grape powder? Let's take a look.
The functions of grape powder
1. First of all, it can protect the grape fruit, on one hand, it can prevent excessive evaporation of fruit moisture, and on the other hand, it has hydrophobicity, which can effectively reduce the occurrence of fruit cracking.
2. The powder can improve the storage and transportation of grapes and reduce the occurrence of postharvest diseases.
3. The powder is one of the standards for judging the appearance quality of grapes. For example, the classification standard for red grapes includes a description of the powder, which belongs to the color category. A complete and uniform appearance of the powder is considered a first-class fruit.
Methods for grape powdering
1. First of all, it is necessary to control production and prosperity reasonably, and do a good job of thinning flowers and fruits. Also, pay attention to leaving twigs in the summer and strengthen the management of flowers and fruits.
2. Fertilization should be scientific and reasonable. It can increase the application of organic fertilizers and combine it with the application of humic acid during the growing period to improve tree nutrition and help the growth of grape powder. In addition, attention should be paid to water management during the growth period, such as not watering during the flowering period and frequent small amounts of watering in the later stage to maintain soil water demand in a timely manner.
3. The supplement of trace elements also needs special attention. For young grape fruits, special attention should be paid to supplementing trace elements such as calcium, magnesium, and zinc, which is beneficial for the formation of grape powder. Phosphate and medium trace fertilizer applications should be increased during the grape coloring period. Spraying high-phosphorus and high-potassium foliar fertilizers can promote the application of powder, coloring, and sugar.
4. Pay attention to scientific medication. After the fruit expands, avoid or reduce the use of emulsified oil and poor-quality powder, and reasonably reduce the number of medication times. If it needs to be sprayed during the coloring period, it is recommended to use a sprayer with good atomization effect to reduce pesticide residues.
5. Pay attention to the method and time of bagging, especially for outdoor grapes. If the powder is not good, the bag can be placed earlier.
In general, grape powder is very important for grape fruits, and it can play a very obvious role, which is one of the direct manifestations of the economic value of grapes. Therefore, we can summarize the above methods to help grapes become more popular with consumers.
The above experience and knowledge of the functions of grape powder, I hope this article can bring you a little help!