When is the Chinese cabbage harvested in the South? In the southern region, Chinese cabbage, early-maturing varieties are used for the supply of fresh vegetables, and harvested in time when the ball is tight. For the mid-late ripe varieties, when the leaf ball is fully mature, the frost will come before the coming, and then the small series will specifically Said that the cultivation technology of Chinese cabbage in the southern region, I hope to help everyone. 1 selection of land, soil preparation, application of base fertilizer 1.1 Site selection Light sandy loam or loam rich in organic matter; Not suitable for continuous cropping, can not be planted with cruciferous vegetables such as cabbage, radish, etc.; Promote grain and vegetable rotation, water and drought rotation. 1.2 Site preparation About one week before sowing, the plot should be ploughed, leveled, and smashed; The specific operation is as follows: the plot is deeply ploughed 20-27cm, the ground is 10-15 days, and then the land is leveled to make a 1.3-1.7m wide raft, or a 0.8m narrow ridge or sorghum; When doing sputum, it is necessary to deepen the sulcus and the sulcus, and the gully is more than 27cm, so that the ditch can communicate with each other to facilitate drainage. 1.3 application of base fertilizer Apply 5000-7000kg of high-quality farmyard manure per acre, and apply 50-70kg of nitrogen, phosphorus and potassium compound fertilizer at the same time; After fertilization, combined with tillage, the base fertilizer and soil are evenly mixed, which is beneficial to the roots and the absorption of nutrients. 2 selection and sowing Seedlings: usually selected at 5-6 leaves in the seedling stage; Early-maturing varieties: seedlings 45-50cm, 2400-2600 plants/m2 per mu of seedlings; 50-55cm seedlings of mid-late ripening varieties, 2200-2400 plants/m2 per mu. In the case of seedlings and seedlings, we work with weeding, cultivating, and cultivating soil; When cultivating and weeding, we should follow the principle of shallow head, deep second, and three roots. 3.2 Fertilizer management Germination period: watering is based on the principle of “three waters and clear seedlingsâ€; In the seedling stage, the root system is underdeveloped, the water absorption capacity is poor, and an appropriate amount of water is needed. At the same time, urea is applied to provide nutrition for seedling growth; Rosette period: need to control the soil water content, it is recommended to topdress 1 time; Balling period: stop the seedlings, water once every other week, and apply appropriate amount of organic fertilizer in combination with watering. 2.1 Selection Choose the right variety according to different planting time, planting purposes and different environments. 2.2 sowing Seeding method: more use of open field live, can also use seedling measures; Live broadcast of Chinese cabbage: strip, hole and machine. Manage watering in time after planting. 3 field management 3.1 Seedling management Seedling management content: seedlings, seedlings, seedlings and cultivating soil. 4 pest control 4.1 Disease prevention Main diseases: downy mildew, viral disease, soft rot, leukoplakia, black spot, etc.; Downy mildew prevention and control measures: In the early stage of the disease, spray and prevent the use of the metalaxyl WP powder or the chlorothalonil WP powder. Virus disease prevention and control measures: spraying 0.3% matrine plant insecticide once every 5-7d for prevention and treatment; Soft rot prevention and control measures: Spray streptomycin sulfate or agricultural streptomycin once every 7 days at the beginning of the disease for prevention (150 mg streptomycin per 1 kg of water). 4.2 Pest Control The main pests: aphids, cabbage caterpillars and so on. Pest control: select insect-resistant varieties, weeding, deep ploughing, introducing natural enemies, spraying some chemical agents for prevention and control; Control measures for locusts: control with sterilizing and cooling diluents or worms; Control measures of cabbage caterpillar: control with bacterial insecticide Bt emulsifiable concentrate or larvae liquid or phoxim emulsifiable concentrate. GMP Certificated Immune Globulin Injection Supplier in China Hepatitis B Immunoglobulin,Hep B Immunoglobulin,Hepatitis B Immunoglobulin Vaccine,Hepatitis Immune Globulin FOSHAN PHARMA CO., LTD. , https://www.fspharmaapi.com
