In the morning, I received a phone call from a big brother in Maozhuang. He said: "The watermelons grown at home are not as good as last year. There are pieces of yellow on the rind. I don't know if I got rickets. You came to help me see it. Look." Immediately after we arrived at the watermelon field of Zhang Dage, we saw the peeling of the watermelon peel, and some of them also showed spots. Zhang Dage describes: “A little bit of fruit can not be eaten after the watermelon is cut.†According to this, combined with the recent high temperature weather of Changge, we determined that it was due to sunburn. Sun burning disease will greatly affect the yield and quality of watermelon. What is the cause of sunburn in watermelon? First of all, environmental factors such as soil drought, persistent high temperature, rainstorm after rain, soil viscosity, low stagnant water and other environmental factors will cause the occurrence of sunburn in watermelon; Second, calcium plays an important role in water metabolism of watermelon, calcium deficiency in soil or Too much nitrogen fertilizer will cause calcium absorption and cause sunburn. Sunburn occurs mostly in the late development of watermelon fruit. At this time, the leaves of the plant gradually decline and the fruit is exposed. Under the condition of high temperature and strong light irradiation, the local temperature of the fruit surface rises sharply and the water quickly evaporates, leading to local peel intracellular proteins. The denatured, crude lipids are dissolved, and other living substances such as enzymes, chlorophyll, and vitamins are destroyed in the living cells, causing sunburn. If the skin is light, the spot peels or the sunburn spots appear. Watermelon sunburn how to prevent it? Before and during the growth of watermelon, organic fertilizer was reapplied, nitrogen fertilizer was applied rationally, and phosphorus and potash fertilizer were used in combination to promote vegetative growth and luxuriant foliage. After the fruiting period of the flowering period, the calcium-containing fertilizer is applied to the roots, and potassium fertilizer or a trace element fertilizer containing copper and zinc is sprayed to increase the heat resistance of the plant and enhance the ability to resist sunburn. In the later period of fruit development, the use of straw or melon vines to cover the watermelon fruit (commonly known as shaded melon, covered melon) can effectively prevent sunburn. Fingerprint Safe,Coffee Color Safe,Fingerprint Panel Safe,Gold Color Fingerprint Safe Hebei Hupai Aodi Cabinet Industry Co.,Ltd. , https://www.aodicabinet.com