Planting Chinese cabbage in the greenhouse in summer
1. Select varieties of heat-resistant Chinese cabbage varieties suitable for summer cultivation, high temperature and high humidity resistance, strong disease resistance and relatively early maturity.
2. Renovation of greenhouse greenhouse greenhouse film should be complete, no leakage of rain, high terrain. Dig a drain of 30 cm wide and 40 cm deep around it. Open a 90 cm wide vent at the top membrane port. The shed is also opened with a vent of 92 cm wide, and then covered with gauze from west to east. In case of heavy rain, the vents should be closed in time, the vents on the north wall should be fully opened, covered with gauze, so that on the one hand, ventilation can be cooled, on the other hand, it can avoid rain and insects.
3. The whole land should be used for cultivating 4000-5000 kg of organic fertilizer per mu and 25-30 kg of compound fertilizer before ploughing, then plowing 20-25 cm, and making a 50 cm wide sputum after leveling.
4. Indoor live broadcast of the live sputum according to 30 ~ 40 cm plant spacing to open a shallow hole to fill the foot water, after the water seeps, 3-4 seeds per hole, then cover 1.2 ~ 1.5 cm thick soil, after the sowing 1 time small water, On the second day, re-irrigation once, the third water after the seedlings, the first seedlings when pulling the cross, the seedlings when 3 to 4 true leaves, one per hole, one water after each seedling and one seedling, Ensure that Miao Qi Miao Zhuang is about 3,500 to 4,000 plants per mu.
5. Fertilizer management between the 3 and 4 kg of urea per mu after the seedlings, 10 to 15 kg of urea per mu in the rosette period, watering immediately after fertilization, and then watering once every 4 to 5 days depending on the situation. During the ball-forming period, 25 to 30 kilograms of urea plus 50 kilograms of decomposed cake fertilizer should be mixed and applied. In this period, a large amount of water should be watered every 3 to 4 days to ensure that the soil is wet and not dry. It is better in the evening. Stop watering 4 to 5 days before harvest.
6. Prevention and control of pests and diseases due to gauze closure, isolation of insects and heavy rains, fewer pests and diseases, basically no spraying. If the closure is not strict, the seedling stage is treated with 2.5% deltamethrin 500 times liquid to control aphids, and also prevent viral diseases. The cabbage caterpillars during growth are treated with Bt emulsion; the diseases are mainly downy mildew and soft rot, the former uses 25 % metalaxyl 800 times solution, the latter is controlled by spray of neomycin or agricultural streptomycin 200 times.
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Earbuds Design Hearing Aid
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