How to prevent melons from melting of zucchini in greenhouse

If the greenhouse zucchini is not managed properly, the phenomenon of melons will often appear. In the early stage of the disease, there are no obvious symptoms, but once found in the later stage, the injured melon has been irreparable. Therefore, prevention should be strengthened in production. Xihulu melon is a kind of physiological disease, and its captivity is more complex: high temperature and drought or low temperature and high humidity in the greenhouse lead to the weakening of the absorption capacity of roots, especially the absorption of some trace elements. Such as boron, magnesium, molybdenum and so on, the photosynthesis of the plant is reduced, the distribution of nutrients in the body is out of balance, and the lack of base fertilizer leads to de-fertilization. The following hunting and application in production can effectively control the occurrence of melons. First, strictly control the temperature and humidity greenhouse zucchini watering should generally be carried out in the sunny morning, should be watered frequently with small water to avoid flooding. Three days before each melon harvest, water should be watered once. After watering, under the premise that the temperature of the shed is controlled at 25 ℃ ~ 28 ℃ during the day, increase the intensity of ventilation and moisture discharge to keep the relative humidity in the shed at 70% ~ 80%. Second, to strengthen the light transmission measures during the peak period, the grass cover should be uncovered early and late every day in order to maintain sufficient light time. In the rain and snow continuous overcast weather, in addition to taking corresponding heating measures, the cover grass should also be uncovered as usual in order to make full use of scattered light to maintain a certain photosynthesis of the plant. (3) topdressing available fertilizer in the peak and later stage of melon, combined with watering, 200 kg of rotten organic fertilizer or 15 kg of available potassium dihydrogen phosphate per mu, and spraying high-efficiency concentrated foliar fertilizer containing multiple elements every 7-10 days. This can not only effectively prevent melons, but also significantly increase the yield. Fourth, the application of hormone stimulation at 7: 9 in the morning, gibberellin smeared with gibberellin open female flower stigma and stalk, can effectively stimulate the rapid expansion of zucchini, induce the concentrated supply of nutrients, prevent melons, but also ensure that the melons are uniform. Fifth, spraying rare earth compound fertilizer after each melon harvest, spraying 1500 times amino acid rare earth compound fertilizer once to regulate the nutrient distribution of zucchini plant, which has the double function of increasing yield and preventing melon.