The use of multiple harvest techniques to cultivate watermelons in greenhouses can harvest 5 to 6 times from May to the end of October. The average yield of watermelons per mu is 7,500 kg. Variety selection uses early watermelon, disease resistance, resistance to low temperature and low light, good regeneration ability and other early watermelon varieties. Breeding strong seedlings in Nanjing is generally sown in mid-January, using electric hotbed nursery. In the greenhouse, a nursery with a width of 1 meter and a depth of 25 centimeters is made. The length depends on the number of nursery. The mulch inside the mulch, fennel, straw, etc., laying electric wire on top and draining it into a nutrient bowl. Immerse seeds and germinate until 80% of seeds are dewy and sow 1 seed per pod. Cover 0.5 to 1 cm thick fine soil after sowing, cover the film, take a small arch. At night, straws were draped over small sheds. The bed temperature before emergence was maintained at 30-32°C during the day and 20-25°C during the night. 70% of the melon seedlings were uncovered and uncovered. After the seedlings are properly exposed, the small arch shelters are properly opened to cool the temperature, and during the day, the shelf temperature is controlled at 20 to 30°C and the nighttime temperature is controlled at 15 to 18°C. One week before transplanting, gradually cool the seedlings. Proper planting before planting and planting 2500 kg of organic fertilizer per acre, 100 kg of cooked cake, 10 kg of urea, 50 kg of superphosphate, 15 kg of potassium sulfate, or 100 kg of high-efficiency multi-element compound fertilizer applied per acre of potassium sulfate. Combined with fertilization, 3% phoxim granules and 50% 50% carbendazim WP are applied per acre to control underground pests and sterilize the soil. One month before the planting, the earthworms were used to make earthworms. The width of the greenhouse was 5 meters wide and 2 feet wide. The width was 2 meters and the middle was 30 centimeters wide. From late February to early March, the plantation was planted on sunny mornings. Each row was planted with 1 row, with a spacing of 80 cm and planted with about 330 plants per acre. After the planting, the living tree was poured and the water was infiltrated to cover the mulch. A small shed was placed above it and the grass shed was covered in a small shed at night. Management within 10 days after temperature and humidity management is mainly based on insulation. During the day, the shelf temperature is maintained at 25-32°C, and kept at 18-20°C during the night. The greenhouse temperature exceeds 35°C and proper ventilation is required to reduce the temperature. After sitting on the melon, increase ventilation. Melon stage and ripening period shelf temperature is maintained at 25-32°C during the day and 15-20°C at night. In mid-April, the small shed was removed. After the temperature increased in May, attention was paid to ventilation and ventilation. At noon on the sunny days, the skirt film and apical membrane were opened for cooling. In summer, the cover membrane is left to leave the top membrane and replenish moisture. In August, the temperature is high, and the evapotranspiration of the plants is large. The moisture and temperature should be controlled scientifically. Fertilizer management After transplanting, Miao Miao was slowed down for 1 week. Nitrogen fertilizer was the main form, and 5 kg of urea per mus of water was added. When the melon eggs are large, per acre, acquaintances excrete 600 kilograms of urine or 10 kilograms of urea, three yuan high-efficiency compound fertilizer 10 kilograms, potassium sulfate 10 kilograms, and then apply it again seven days later. After each harvest, potassium sulphate and urea were applied for 10 kilograms per acre or 45% for a compound fertilizer of 30 kilograms per mu. Watering watermelon in greenhouses should not be too much, should be based on a reasonable degree of fresh water. The plant was adjusted to take three vine pruning. When the main vine grows 60 centimeters, 2 strong lateral vines are selected at the 3 to 5 sections, and all the other side vines are removed to reduce nutrient consumption. After the melon is stable, remove weak branches, diseased branches and old leaves, and diseased leaves to facilitate ventilation. Select crushed soil in sunny afternoon. When managing the size of the melon egg, the flower and fruit will leave 1 to 2 melons per plant after 12 knots. When the melon diameter is 12 cm, remove the malformed melons and excess melons, and leave an average of 1 melon per plant, leaving 330 melons per acre. After melons, turn melons 15 to 20 days and use dry straw or fruit mats. The first batch of melons 7-8 matured at the base of the new hair vines to choose to leave the second batch of melons, leaving melons to determine the growth of melon vines, vines grow more than stay melon, and vice versa to stay less melon. The temperature in autumn is high, and the melon section should be properly pushed back. Generally, 2 melons are reserved after 20 knots. The third and fourth batch of melons should be properly removed when they are too much to ensure the quality of melons. Prevention and control of pests Attention should be paid to the control of watermelon damping-off, blight, wilt, leaf blight, downy mildew, anthracnose, powdery mildew, aphids, and red spider. The first batch of melons was harvested 37 to 40 days after the timely harvest of female flowers, and harvested once every 30 days or so. When the head picking melon picking part of the two melons have been sitting on the melon, careful not to pull the vines too much. 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