The cool climate of Chinese cabbage grows best when the average temperature is 18 to 20 degrees Celsius and sunny, and it can tolerate minus 2 to minus 3 degrees Celsius for a short time. Dark green varieties are not heat-resistant. The root group of milk cabbage is light, and its absorption capacity is weak. During the growth period, it is necessary to continuously supply fertilizer and water, and it is not tolerant.
1. Cultivation can be carried out in the frost-free period from spring to autumn, mainly to harvest young plants. In the spring, the temperature is about 40 days when the temperature is low, and it can be harvested from the summer to the fall of 22 to 28 days. It is cultivated in protected areas during the cold season and can be produced throughout the year.
2, live or nursery transplant: harvesting large plants, using the nursery transplant method, seedling period of 20 to 25 days, plant spacing 15 times 15 cm, planting to harvest for 30 days. With drills, drills are spaced 12 to 15 centimeters apart and 10 to 15 centimeters are planted at seedlings. 400-500 grams of sowing per acre.
3, field management: (1) the application of water and fertilizer: cabbage production cycle is short, it is appropriate to apply more organic fertilizer as a basal fertilizer, appropriate growth during the top-dressing fertilizer, or combined with spray irrigation for fertilizer. Top dressing is mainly quick-acting nitrogen fertilizer. The method, period, and amount of fertilizer application should be based on the situation of the seedlings, soil, weather, etc. The principle is that thin fertilizer is used several times. Watering is generally performed in combination with topdressing. Transplants should not be deficient in water within 3 to 5 days after colonization. In summer and early autumn, watering should be performed every day for 3 to 4 days after colonization. (2) Intertillage and weed control: The direct seeding field is suitable for weed eradication with herbicides, and weeding with seedlings during seedling stage.
4. Prevention and control of diseases and pests: common diseases include viral diseases, downy mildew, vitiligo, etc., and comprehensive agricultural measures can be taken to prevent and control, such as avoiding replanting or neighboring with other cruciferous vegetables, rational irrigation and drainage, and increasing phosphorus and potassium fertilizers. Increase plant resistance. Drug control can be sprayed with fungicides such as chlorothalonil. The main insect pests are vegetables, aphids, cabbage butterfly, yellow striped hop, etc., should be detected as soon as possible to prevent and control, control methods and general cruciferous vegetables the same.
Harvest and seed collection:
1. Harvesting: The criteria for the harvest of adult plants is that the plant leaf bundles grow from strong growth to closed growth, and the heart leaves grow to be flush with the outer leaves. At this time, the single plant weighs about 275 grams, and the per mu yield is between 1000 and 1600 kilograms.
2. Seed-picking: The seeds of Chinese cabbage should be strictly isolated from other Chinese cabbage vegetables, and must be isolated from other cultivated crops with a similar chromosome number in the genus. The original farm space is at least 2,000 meters above the isolation distance, and the production isolation distance should not be less than 1,000 meters. The species used for production were mostly planted in northern farming areas, and seed production was performed using small strains.
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