Efficient multiple cropping of lettuce, muskmelon and garlic in greenhouse

In the multiple cropping mode of lettuce, muskmelon and green garlic in the greenhouse, lettuce was sown and raised in mid-late September, transplanting in late October and harvested in mid-March; thick-skinned muskmelon was sown in late February, planted in late March, harvested at the end of June and early July; green garlic was sown in late July and harvested in mid-late October. It can produce 45005000 kg lettuce, 2500kg muskmelon and 2000kg garlic per mu, and the net income per mu can reach more than 17000 yuan. Lettuce selected precocious, cold-resistant purple leaf incense, cold-resistant two white skin, cold-resistant two green skin and other varieties. The seedlings were raised in the open field, during the period of 2 to 3 leaves, and to transplant with soil at 5 to 6 leaves. The greenhouse is 8 meters wide, 2.8 meters high and 80 meters long. Two beds are made inside the shed, with a width of 3 to 3.5 meters, with a sidewalk 50 centimeters wide in the middle. Trenches are opened on both sides of the shed. Planting row spacing 30 cm, plant spacing 25 cm, planting 8500-9000 plants per mu. During the growth period, timely ventilation and humidity reduction, to prevent downy mildew, gray mold, Sclerotinia sclerotiorum, soft rot, before harvest to prevent aphids, Bemisia Tabaci and other pests into the shed. Thick-skinned muskmelon is selected to be early-maturing and disease-resistant varieties with tolerance to low temperature, weak light and humidity. The seedlings were raised with hole disk substrate and were transplanted when the seedlings had 4 or 5 true leaves. Planting small high border in the north-south direction in the greenhouse, with a height of 20 cm, a width of 2.5 m, a width of 60 cm and a width of 60 cm. Drip irrigation pipes were laid and holes were covered with plastic film to plant melon seedlings. Each border was planted in a row with a distance of 40 cm to 45 cm, with about 600 plants per mu. Using climbing cultivation or frame cultivation, single or double vine pruning, the planting density of double vine pruning is half that of single vine pruning. There are few insects in protected cultivation of muskmelon, so artificial pollination must be carried out to promote melon setting. Young melons are sparse when the eggs are big, leaving 4 melons per plant. When the main vine or sub-vine has 24 or 26 true leaves, the plant with weak growth can retain 1-2 sub-vines at the top for its growth and maintain a certain growth potential. During the growing period, all favorable measures should be taken to ensure the necessary temperature conditions for melons. Cantaloupes cultivated on the ground are vulnerable to diseases and pests when they touch the ground, and the flesh will harden or rot. Grass can be spread under the vines during pruning to prevent melons from touching the ground. Turn the melon when it is half-big to improve its color and flavor. Common diseases include powdery mildew, vine blight, bacterial brown spot, leaf blight and so on. Pests include aphids, red spiders, tea yellow mites, leaf miners and so on. Green garlic is selected to be disease-resistant and resistant to storage and transportation, such as Ershui early and March Yellow. Before sowing, rake the small high beds where muskmelons are planted and open a trench every 2 meters. Soak the garlic seeds and spread them out at 5: 7 ℃. After 10: 15 days, sow the seeds when the buds germinate. The row spacing is 10 cm, the plant spacing is 5 cm, and about 130000 plants are planted per mu. After sowing, wheat straw 3 cm to 4 cm thick and 2500 kg to 3000 kg per mu can be spread in the field to increase the length of garlic pseudostem.