What are the common causes of color difference and unsweetened fruit on grapes?

Grape With the continuous development of grape planting, many areas began to grow grapes, but it was found that the price of grapes in some places was much higher than that in other places. The important reason is sweetness, which determines the quality grade of grapes. The sweetness of grapes also determines the quality and market of grapes. Compared with the famous grapes in Xiaoxian, Anhui and Xinjiang, its climate is more suitable. For other regions, the effect of grape sweetening can be achieved through scientific management methods, rather than adding sweeteners. When it comes to coloring grapes, some fruit farmers often have good results when they meet grapes, but the coloring is not good, some are mature, and mine has never been colored. What should I do?

Generally speaking, there are many factors that affect grape discoloration, such as temperature, light, variety, load, tree potential, root system, ear size, nutritional status, fertilizer use and so on. It will affect the effective discoloration of grape fruit. Next, I will tell you three ways to make grapes sweet. Grape planting water. Grape planting should be properly watered, and everyone should be properly watered during the grape growing period. For over-arid areas, a small amount of straw can be covered to properly ensure the soil moisture of grape planting, which can effectively promote the sweetness of grapes. Photosynthetic methods of grapes. Proper illumination is helpful for coloring and sweetening grapes. It is suggested that the leaves of grapes should be healthy and have enough space for photosynthesis.

Grape planting in greenhouse needs light during grape discoloration, and proper outdoor work can effectively help grape coloring and sweetening. Reasonable proportion of grape leaves and fruits. Basically, it is necessary to control the leaves and fruits of grapes reasonably and improve the illumination and sweetness of grapes. Our local grapes in Kyoho basically need 14 leaves, and red grapes need 18 leaves. Therefore, proper control of grape leaves is more conducive to the illumination and coloring of grapes and can effectively increase the sweetness of grapes. Topdressing high potassium fertilizer. In fact, the sweetness of grapes depends on the temperature difference between day and night, the length of light, the variety and so on, but for growers, these cannot be changed. What growers can do is to increase the sweetness of grapes from the aspect of fertilization management. Apply more organic fertilizer, and apply high-potassium water-soluble fertilizer "Shendu Fruit" during the fruit expansion period.