How to grow greenhouse cabbage in summer?

How to grow greenhouse cabbage in summer? Please introduce the planting method the solar greenhouse can only be used as an open field in summer, and its facilities can not be fully utilized. If Chinese cabbage is planted in it, it can not only enrich the variety of vegetables in the market, but also have considerable economic benefits. The main points of cultivation are as follows. 1. Select the heat-resistant Chinese cabbage varieties which are suitable for summer cultivation, high temperature and humidity tolerance, strong disease resistance and early maturity. two。 The greenhouse film of the solar greenhouse should be complete, non-leaking and high-lying. Dig drainage ditches 30cm wide and 40cm deep around it. At the top, there is a ? 0 cm wide vent. A 92 cm wide vent is also opened at the foot of the shed, and then tightly covered with gauze from west to east. In case of heavy rain, the vents should be closed in time, and all the vents on the north wall should be opened and covered with gauze, so that on the one hand, they can be ventilated and cooled down, on the other hand, they can be protected from rain and insects. 3. Before land preparation and ploughing, 4000kg / mu of rotten organic fertilizer and 25kg / mu of compound fertilizer were applied, then ploughed 20cm, leveled and made into a border 50 cm wide. 4. In the indoor direct seeding, the seedlings were watered at a distance of 30 to 40 cm from the shallow hole, sowed 3 to 4 seeds per hole after water infiltration, then covered with 1.2 to 1.5 cm thick soil, irrigated once after sowing, once again on the second day, and irrigated for the third time after finishing the seedlings. when the seedlings were crossed for the first time, the seedlings were fixed when they had 4 true leaves, 1 plant in each hole, and the seedlings were watered once after the interseedlings and fixed seedlings were watered once to ensure that the seedlings were strong and about 3500 million seedlings per mu. 5. After applying urea 3kg / mu in the fertilizer and water management room and 10kg / mu in the rosette stage, the urea was watered immediately after fertilization, and then watered every 4 to 5 days according to soil moisture. During the heading period, urea 25kg / mu was mixed with 30kg urea and 50kg cooked cake fertilizer. During this period, a large amount of water should be watered once every 3 to 4 days to ensure that the soil was wet but not dry. In the later stage of heading, water should be properly controlled and watering in the evening was better. Stop watering 4-5 days before harvest. 6. Prevention and control of diseases and pests because the screen is closed, isolated the source of insects and rainstorm attack, fewer diseases and pests, basically no spraying. If the closure is not strict, 2.5% deltamethrin 500x solution is used to control aphids at seedling stage, and bt emulsion is used to prevent virus disease. The diseases are mainly caused by downy mildew and soft rot, the former is sprayed with 25x metalaxyl 800x solution, and the latter is sprayed with neophymycin or agricultural streptomycin 200x solution. Click to get more cabbage planting techniques click to get more vegetable planting techniques