First, the selection of excellent varieties: the selection of heat-resistant 45 Chinese cabbage varieties, this variety of short growing period, tight ball, good quality, the average yield per mu can reach 4,000 kg. Anti-heat 45 Chinese cabbage anti-viral disease, resistance to downy mildew, more resistant to soft rot, can still normally ball when the temperature reaches about 35 °C, can be harvested 60 days after planting, suitable for early spring protection and summer cultivation, It is an ideal variety for the production of Chinese cabbage in the off-season.
Second, the sowing date: The suitable sowing date in summer is from the beginning of June to the end of July.
3. Land ploughing: After the harvest of the sorghum crop, 3000~5000 kg of fermented organic fertilizer per mu, 75 kg of ternary compound fertilizer, 20 kg of superphosphate, 10 kg of zinc sulphate, deep and fine after fertilization, do To the land leveling. In order to facilitate drainage, it is best to use high ridges or sorghum during cultivation, with a ridge distance of 40 cm and a width of 80 cm. In order to prevent the occurrence of pests and diseases, 0.75 kg of methyl thiophanate and 10 kg of fine soil can be used per mu and buried under the armpit.
Fourth, the seeding method: live after June 1st, before the nutrient block (é’µ) seedlings, and then transplanted. In order to save seeds during live broadcast, the seeding is good, the plant spacing is 33-37 cm, the line spacing is 40 cm, 4500-5000 plants per mu, 50-100 grams per mu, and 0.5 cm thick after sowing. Earth, and flattened and compacted.
V. Field management:
1. Miao Miao and Ding Miao: The first seedlings are carried out in 3 to 4 leaf stages, and the seedlings are fixed in 5 to 6 leaf stages. Try not to damage the roots during the seedlings and seedlings to prevent soft rot in the roots, and maintain 4,500 to 5,000 seedlings per acre.
2, fertilizer and water management: high temperature in summer, soil water evaporation is fast, should always keep the soil moist, to prevent soil unevenness. In high temperature and dry weather, the amount of water should be increased. When it is raining or raining, it should be drained in time to prevent the water from accumulating in the field. 10 to 15 days before the summer cabbage, the water is poured once, then the seedlings are ploughed, and the seedlings are poured after the water is poured. During the ball-forming period, it is necessary to pay attention to maintaining the soil moisture. When the surface is whitish, it should be watered in time. In combination with watering, apply 10 kg of urea or 15 kg of ammonium sulfate per acre, mainly by point application or ditch application, and the fertilization point should be far away from the plant 8~ 10 cm to avoid root damage. Watering was stopped 5 to 7 days before harvest.
3, vegetable field coverage: for heat preservation and weeding, after the seedlings are covered with wheat straw or straw in the vegetable field.
4, pest control: The main diseases of summer cabbage are downy mildew and soft rot, and the diseased plants should be removed in time. When controlling downy mildew, it can be sprayed with 40% ethylphosphorus aluminum wettable powder 200-300 times liquid or 50% toxic mycelium manganese zinc 500-600 times in the early stage of the disease. For soft rot, in the early stage of the disease, 50% di fungicide per acre 10 grams of water 25-30 kg or high yielding spirit 200-300 grams of water 100 kg spray control, can also be used agricultural streptomycin wettable powder 3000 ~ 4000 The liquid is sprayed and controlled. The main insect pest of summer cabbage is cabbage caterpillar, which can be used to kill the gram and the green treasure or to prevent it once.
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