1. Adjust the temperature and increase the light. After planting zucchini, the shed temperature should be kept at 25℃～30℃ during the day and 18℃～20℃ at night to promote slow seedling. After the slow seedling, the temperature should be appropriately lowered, and the temperature should be controlled at 20℃～26℃ during the day and 12℃～15℃ at night to promote the healthy growth of plants. After the fruit is set, the temperature should be raised appropriately, keeping it at 25℃～30℃ during the day and 15℃～20℃ at night. Increase the temperature difference between day and night to facilitate the accumulation of nutrients and the expansion of the melon. Under the condition of maintaining the temperature in the shed, pull the grass curtains in the morning and at night, turn on the fluorescent lights, hang up the reflective screens, and spray photosynthetic micro-fertilizer at the same time. 2. Strengthen fertilizer and water management. When the root melon is 10 cm long, water the first water, topdressing 25 kg of compound fertilizer per acre with the water, then water it every 15-20 days, and combine watering for topdressing. Watering is generally carried out in the morning on a sunny day, and not on cloudy days, to prevent lowering the temperature of the shed and aggravating the disease. In addition, due to the low temperature of the shed in the deep winter and less ventilation, carbon dioxide fertilization can be carried out. 3. Artificial pollination. Zucchini is a dioecious pollinated vegetable, which must be artificially pollinated under greenhouse cultivation conditions. Method: From 9 to 10 o'clock every morning, pick the male flowers that opened that day, remove the corolla, and lightly smear the stamens of the male flowers on the stigmas of the female flowers to receive pollen. Each male flower can infect 5 female flowers. At the same time, use 20ppm 2,4-D solution to smear female stigma or flower stalk, which can increase the fruit setting rate. In addition, when there are too many flowers on the plant, it is necessary to thin the flowers properly to ensure the normal fruiting of the plants. 4. Prevent pests and diseases. The main diseases and insect pests of summer squash in greenhouse are virus disease, gray mold, aphids and whitefly. Virus diseases are mainly prevention, to eliminate virus-transmitting pests. In the early stage of disease, virus Ling, Virus No. 1 and other sprays can be used for prevention and control; gray mold can be controlled by spraying Kemalin and Fangmingling; powdery mildew can be prevented by spraying with sulfur gum suspension; aphids Use Miuyui No. 1 spray to control, whitefly can be controlled with imidacloprid, dexamethasone, or use yellow board to trap and kill. 5. Harvest in time. Zucchini uses tender melons as the product. It should be picked early. It can be harvested 10-15 days after the female flowers bloom and the fruit weighs 250-300 grams. The zucchini continues to bear fruit on a main vine, and the lower melons are not harvested. Affect the growth of the upper young melons and even the melons. Only by increasing the frequency of harvesting and harvesting more tender melons is the way to obtain high quality and high yield. Harvesting is done in the morning, when the temperature is low, the air humidity is high, and the water content in the fruit is high, it is easy to keep fresh and tender. After harvesting, wrap them in soft paper one by one, and store them for 1 to 2 days without affecting the quality. Disclaimer: Some articles on this website are transferred from the Internet. If the legal rights of a third party are involved, please inform this website for processing. phone Polypropyl carbonate is soluble in polar solvents such as ketones, ethyl acetate, dichloromethanes and chlorohydrocarbons, and insoluble in alcohols, water and aliphatic hydrocarbons. It also forms a stable emulsion in the water. PPC allows gases like oxygen to diffuse through it. The glass temperature (Tg) is between 25 and 45℃, and PPC adhesives are amorphous. The glass temperature of PPC is slightly higher than that of polyethyl carbonate (PEC). Poly Propylene Carbonate Ppc,100% Recycled Ppc,Bio-Based Ceramic Binder Ppc,Electroceramics Application Ppc Xingbang High Molecular Materials Co., Ltd. , https://www.chemicaladditive.com
Five points for the management of summer squash in the greenhouse
It is currently in deep winter, and environmental conditions such as low temperature and low light are not conducive to the growth of zucchini. Therefore, the following five aspects of management need to be strengthened to obtain high yield.