Then we came to Zhang Da Ge's watermelon field and saw that the watermelon peel faded, and some also had lesions. Zhang Da Ge described: "After the watermelon is cut, there is a little fruit that can not be eaten." According to this, combined with the recent high temperature weather in Changge, we determined that this is the cause of watermelon sunburn. Sunburn will greatly affect the yield and quality of watermelon, so what is the cause of watermelon sunburn?
First, environmental factors such as soil drought, persistent high temperature, fine weather after rain, soil viscosity, and low water accumulation may cause the occurrence of sunburn in watermelon. Secondly, calcium plays an important role in the water metabolism of watermelon. Excessive application of nitrogen fertilizer causes calcium absorption disorder, which can lead to sunburn.
The watermelon sunburn occurs mostly in the late stage of watermelon fruit development. At this time, the leaves of the plant gradually decline and the fruit is exposed. Under the conditions of high temperature and strong light irradiation, the local temperature of the fruit surface rises sharply, and the water rapidly evaporates, resulting in intracellular protein in the local peel. Degeneration, the protoplast lipids are dissolved, and other living substances in living cells such as enzymes, chlorophyll, vitamins and other structures are destroyed, resulting in a sunburn phenomenon. Lightly, the local peel fades or the sunburn spots appear, and in severe cases, the fruit is malignant and unpalatable.
How to prevent and cure watermelon sunburn? Before and during the growth of watermelon, re-apply organic fertilizer, rationally apply nitrogen fertilizer, and apply phosphorus and potassium fertilizer to promote vegetative growth and flourishing branches and leaves. After the flowering result period, the root application of calcium-containing fertilizer, the application of potassium fertilizer or spraying of trace element fertilizer containing copper and zinc to improve the heat resistance of the plant and enhance the anti-sunburn ability. In the later stage of fruit development, the watermelon fruit is covered with straw curtain or melon vine (commonly known as shade melon and melon), which can effectively prevent the occurrence of sunburn.
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