The reason for the bursting of watermelon is that the timing of the use of the swelling agent is not appropriate. After using the swelling agent, the melon and fruit vegetables can increase the yield by about 20%. When used, the growth should be carried out in the early melon stage. Because the growth of the early stage of watermelon is mainly caused by the increase of the number of cells, and the distribution is even, the solid inside the melon, the appropriate growth rate, the growth rate of the cells in the melon Can be consistent and not easy to produce cracked melons. After entering the expansion period, the cells in the melon are of different sizes. After using the swelling agent, the cells in the melon are stimulated to expand rapidly, and the growth rate of the melon skin can not keep up with the growth rate of the melon, resulting in uneven force of the melon skin, and a large number of cracked melons occur. phenomenon.
Therefore, it is recommended that melon farmers must first carry out small-area tests before using some new technical measures, pesticides, etc., especially for swelling agents. Secondly, the weather situation has aggravated the situation of cracked melons. On the second day after the use of the swelling agent, the local area encountered a cooling weather, a rain fell, the temperature in the shed fell, the melon skin was greatly affected, and the melon was still growing rapidly, which further exacerbated the occurrence of watermelon cracking melon. . After the combination of these two factors, there is the occurrence of watermelon craving.
The north of the arch shed watermelon, cracked melon is also one of the problems of vegetable farmers in the management process. Most of the watermelon cracking melon occurs in the three periods after pollination, about one kilogram and mature time, and the methods to prevent cracking melon are also varied. Summarized a few can be summarized as "four steps", specifically:
The first step: to smooth the stems, to ensure that the elongation of the juvenile is not blocked.
Previously, a melon farmer in a county reported that after pollination of watermelon, it was managed as usual, but this year many watermelons showed cracking of the melon handle. This split melon is split from the junction of watermelon and melon handle. In the early stage of pollination, the fiber content in the stalk is small and brittle. At this time, the growth rate of stems or young melons is very fast (plant protection technology consulting WeChat). If the adjacent stems are entangled, so that the young melon is blocked when it is stretched forward, the phenomenon of cracking is easy to occur. Therefore, in addition to the removal of male flowers and the lateral vines on the base of the stems, it is necessary to timely stalk the stems so that they do not interfere with each other during the growth process, especially after pollination, to leave room for the elongation of the young melons in time. To prevent cracking melons.
The second step: anti-cracking melon before and after pollination.
Authentic sea elf fertilizer is sprayed 4-5 days before pollination to prevent watermelon cracking. When you use the flower, you can use the spray to apply the melon. The specific method is to use the small watering can to spray the melon on the left and right sides of the young melon. Sitting on the melon is suitable for immediate after pollination. It is best to pollinate and spray, and it is possible to go to the afternoon at the latest, but not to the next day. When the melon is fixed, the young melon with the small umbilical cord and the fruit type is left, and the umbilical cord has poor toughness, which is prone to umbilical cracking. At the same time, after the melon is fixed, the surface can be sprayed with striated calcium and cytokinin to improve the toughness and growth rate of the melon and prevent the occurrence of cracking.
The third step: appropriate evacuation of nutrition.
For the growing plants, the stems can be artificially squeezed or the stems are longitudinally cut into a small section at 3 to 4 leaves in front of the melon, and the nutrient is transported to the melons in a concentrated manner; Strong potential, you can remove some of the leaves, reduce the accumulation of some nutrients, avoid the short-term growth of young melons and easily cracked melons; can also use the bamboo sticks with a diameter of 1/3 of the handle to insert vertically into the melon handle, controlled More nutrients flow into the young melon to prevent cracking of the melon due to overnutrition; or after sitting on the melon, the nutrient supply of the main vine is evacuated by letting the growth of part of the root side vines.
The fourth step: pay attention to environmental regulation during the expansion of the melon.
After sitting on the melon, keep the temperature at 30-32 °C during the day and 18-20 °C at night. The long-term temperature during the day is too high, so that the watermelon grows too fast. After the temperature drops in the evening, the surface melon skin temperature decreases, and the growth rate slows down, resulting in inconsistent growth rates of the two, which are prone to cracking. In addition, long-term low temperature and low light, the melon expansion is greatly inhibited, and the degree of cork is high. When the water is poured on a sunny day, the growth rate of the young melon will exceed the tolerance of the melon. melon.
If the humidity is too large for a long time before and after pollination, dew condensation will occur on the female flower. After the wind and humidity change drastically, it is easy to produce small cracks in the flower bud. As the watermelon grows, the crack will gradually become larger. When the watermelon is rapidly expanding, it is easy to break the melon from the crack. Therefore, on weekdays, we should pay attention to combing the stems. After watering, combined with ventilation, reduce the water in the field and reduce the humidity in the greenhouse.
Finally, fertilizer management. During the period from the vine to the flowering, it is necessary to control the water and control the fertilizer. At this stage, if the soil is not dry, the plants do not appear wilting, generally do not water, at the same time to increase the temperature difference between day and night, promote the transformation of watermelon from vegetative growth to reproductive growth, good flower bud differentiation is the premise to ensure that watermelon does not split melon. Appropriately pour small water before sitting on the melon to prevent the soil from being too dry during the expansion period.
The expansion of melon is the period of maximum water and fertilizer in the life of watermelon. It is necessary to ensure that the water and fertilizer are timely and sufficient, not too early or too late. The water supply should be balanced, not wet and dry, to prevent cracking. When the watermelon grows to a diameter of about 15 cm, it is the peak stage of watermelon growth. It needs a lot of water and fertilizer. It can be combined with watering to apply high-potassium water-soluble fertilizer. It is recommended to choose authentic sea spirit fertilizer to enhance the toughness of the skin. Split melon. 7-10 days before the ripening of the melon, the watering should be stopped to prevent the water supply from increasing the cracking melon.
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