First, choose the fine varieties: choose heat-resistant 45, Xiafeng, summer green and other heat-resistant, strong resistance, good yield and good cabbage varieties.
Second, sowing date: Suitable sowing date in summer is from early June to the end of July.
3. Rigid land reclamation: After the harvest of the upper loquat crops, 3000-5000 kg of organic fertilizer per acre, 75 kg of ternary compound fertilizer, 20 kg of superphosphate, and 10 kg of zinc sulfate were used. Land formation. In order to facilitate drainage, it is best to use high ridges or sorghum when growing, with a ridge spacing of 40 cm and a width of 100 cm. In order to prevent the occurrence of pests and diseases, 0.75 kg of thiophanate-methyl and 10 kg of fine soil can be used per acre and buried under the armpits.
Fourth, sowing method: In order to save seeds when live, sowing is better, plant spacing is 33~37 centimeters, row spacing is 40 centimeters, 4500~5000 plants per acre, seed quantity per acre is 50~100 grams, covering after broadcast 0.5 cm thick fine soil and flattened and compacted.
V. Field Management
1. Seedlings and Dinglings: The first thinning is carried out in the period of 3 to 4 leaves, and 5 to 6 leaf stage Dingmiao. When the young seedlings and young seedlings are planted, do not injure the roots as far as possible so as to prevent the occurrence of soft rot in the root system, and keep 4500 to 5000 strains per mu.
2. Fertilizer and water management: In summer, the temperature is high and the soil moisture evaporates quickly. We should always keep the soil moist and prevent the soil from getting wet and dry. In high temperature and dry weather, the amount of watering should be increased, and the water should be discharged in time of rainfall or after rain to prevent the accumulation of stagnant water in the field. Summer cabbage wrapped in water 10 to 15 days before the water, and then cultivator seedlings, watering seedlings and then topdressing a Zhuang heart fat. During the nodule period, soil moisture should be maintained. Water should be watered in time when the surface is white. Apply 10 kg of urea or 15 kg of ammonium sulfate per acre for watering. Use acupuncture or furrow-based irrigation. The fertilization point should be far from the plant. 10 cm to avoid hurting the roots. Stop watering 5 to 7 days before harvest.
3. Covering of vegetable fields: For heat preservation and weeding, cover with straw or straw in vegetable fields after settling.
4. Pest control: The major diseases of summer cabbage are downy mildew and soft rot. After the emergence of the diseased plants, it must be promptly removed. In the prevention of downy mildew, it can be sprayed with 40% EB aluminum wettable powder 200 to 300 times liquid or 50% ray toxic mold manganese zinc 500 to 600 times spray at the early stage of its onset. For soft rot disease, 200-300 grams of water can be sprayed on 100-kilograms of water per mu in the early stage of disease, and sprayed with 3000-4000 times of agricultural streptomycin-containing wettable powder can also be used. The main insect pest of summer cabbage is cabbage caterpillar, which can be used to kill dead card and green treasure or net prevention.
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