1, site selection and soil preparation. The quality of alpine planting is good, the planting time is not strict, the land is fertile, and planting needs more nutrition. The land where Chinese cabbage has never been planted before is better. It is most suitable for planting in middle altitude areas. You can choose late-maturing varieties. Four kilograms of farm manure, thirty kilograms of nitrogen fertilizer, twenty kilograms of phosphorus fertilizer and twenty-five kilograms of potassium fertilizer are used for one mu of land preparation. Dig deep ditches to fertilize. The border is covered with plastic film.

2. Seedling management. Sowing in autumn and August, early-maturing cultivation is better, and protected cultivation is selected. After turning the ground to dry for a few days, sprinkle lime for disinfection, and sprinkle 200 kilograms on an acre of land to subdivide the soil. Disinfect with carbendazim after soil preparation. Trenching and drainage between each seedbed. Sow evenly, cover with 1 cm of soil, and use 30 grams of seeds per mu. Moisturize and cover the sunshade net.

3. Transplant management. After the seedlings are unearthed, they can be transplanted in about a month, and they are about five true leaves long. Apply 60 kg of compound fertilizer to an acre of land. Two thousand kilograms of organic fertilizer is used as base fertilizer. The planting row spacing is 30 cm and the plant spacing is 20 cm. Water every day after planting to help slow down the seedlings. After the seedlings are delayed, if they grow well, they can continue topdressing and watering.

4. Disease control. The common disease is black spot disease, which is more common in the south and can be infected many times. High temperature and high humidity are serious diseases. Seeds can be disinfected by soaking in hot water at 50℃ for half an hour, or by using 75% chlorothalonil wettable powder with a mass of 0.4% of the seeds. Control drugs, 10% difenoconazole water dispersible granules 1000 times solution control.