How to produce pollution-free Chinese cabbage

Early-maturing No. 5, green vegetables and long-stemmed cabbage. Sowing 1. Seeding method: Live seeding can be used when planting, and seedling transplanting can also be carried out. 2, sowing time: the most suitable sowing date of early maturing No. 5 is August; long stem white cabbage is planted in early September, planting in early September, from early to late October, the seedling age is about 25 days; the green vegetables can be from July to October. Sowing seedlings, 20-40 days in seedling period, the highest sowing yield in September, and cultivation of large green vegetables in July-August. 3, seeding amount: seedling transplanting planting with a seed amount of 100-150 grams, live seeding amount of 500-900 grams. 4, sparse seedlings or planted live broadcast of Chinese cabbage should be divided into seedlings, seedlings according to a certain plant spacing. Early maturing No. 5 is used for cabbage cultivation. It is planted at a row spacing of 0.5 m and plant spacing of 0.3 m. The planting is about 4000 plants per mu; the long-stalked cabbage is 26 cm × 23 cm in length, and 8000-10000 plants are planted in acre; the vegetable spacing is 17 cm. ×17 cm, 23,000-29000 plants per mu. 5, fertilizer water management drought in summer, pakchoi emergence difficulties, watering each morning and evening before emergence. After emergence, in case of high temperature and dry weather, water should be watered once in the afternoon or in the afternoon. From 3-4 days after planting of Chinese cabbage to 10 days before harvesting, the whole fertilizer is topdressed 4-6 times, and the fertilization concentration is from light to thick. Pest Control 1. Occurrence of Pests and Diseases: July-September is the peak of various pests. Spodoptera litura and Spodoptera exigua are serious, soft rot and downy mildew also occur. In the early period from October to December, the pests were more serious, and soft rot, viral diseases and downy mildew were more prevalent. 2, pest control methods: pay attention to rotation and clean the pastoral, as far as possible with non-cruciferous vegetables for rotation, timely removal of diseased leaves, concentrated deep burial or incineration. Insect pests: Fields with pests such as cabbage caterpillars, aphids and red spiders can be used as insecticide 3000 times solution; for pests such as Plutella xylostella and Pieris rapae, BT powder 1000 times solution can be used; Pests such as Plutella xylostella, Spodoptera litura, yellow-striped flea and leaf miner can be used in a field of 600-1000 times speed or 1000 times liquid. Disease prevention: different diseases should be treated with different drugs for spraying, such as downy mildew, 75% chlorothalonil 600 times solution or 64% antivirus 矾 500 times solution can be used for prevention and control; soft rot can use 70% dikesong 1000 Double liquid or 77% can kill 800 times liquid for prevention; virus disease can be controlled with 20% virus A500 times liquid or 1.5% virus spirit 1000 times liquid; white spot disease can choose 50% carbendazim 800 times liquid or 75% The chlorothalonil 1000 times solution is used for prevention and treatment; the black spot disease can be controlled by using 75% chlorothalonil 600 times solution.
From:Northland Agricultural Network

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