1) Variety selection. When cultivating kale and Cantonese cabbage in greenhouses, late-maturing varieties should be used. For kale, you can choose copper-shell leaf kale, late-flowering kale, etc. For Cantonese cabbage, you should choose Chi Xin No. 2, Chi Xin No. 29, March green cabbage heart, Qingyuan Ye Chi Xin, Qing Liu Ye Chi Xin, etc.

(2) Sowing and raising seedlings. Kale and Cantonese cabbage can be sown directly or transplanted in seedlings. Multi-row seedlings can be transplanted in greenhouses. The supply period of greenhouse kale should be from December to March of the following year after harvesting in the open field. The sowing period should be arranged between mid-to-late August and October. Guangdong cabbage has a short growth period and can be harvested 45-55 days after sowing. It can be sown in batches from September to October and November to January. Seedlings should be grown in the open field before October and in greenhouses in protected areas after October. Each mu of seedbed requires 800 to 1,000 grams of seed, which can be used for planting in 10 to 12 acres of field. After emergence, it is necessary to time the seedlings, cultivate strong seedlings, apply fertilizer and water at appropriate times, and pay attention to disease and insect pest control. When the seedlings grow to 4 to 6 true leaves and are 25 to 30 days old, they can be planted.

(3) Colonization. Select fields with easy drainage and irrigation and rich in organic matter. Apply 2000 to 3000 kilograms of decomposed manure per acre as base fertilizer. Plow into the soil and rake it flat to make sorghum. The distance between rows of Guangdong cabbage is 10 to 15 cm square, and the kale is 18 cm x 20 cm. Plant-row spacing. Choose a sunny day in the evening or a cloudy day for planting, and plant as you go. Diseased and weak seedlings must be eliminated, and planted according to the size of the seedlings in order to achieve consistent growth, convenient management, and a relatively concentrated harvest period.

(4) Post-colonization management. ①Temperature and humidity management of greenhouse. The suitable temperature for the growth of kale and Cantonese cabbage is 15 to 20 ℃, and the optimal temperature for flower sprout formation is 15 ℃. If the temperature is too high or too low, the sprouts will be slender, the yield will be low, and the quality will be poor. Winter cultivation in greenhouses should be covered with film from late October to early November. In the early stage, attention should be paid to ventilation, cooling and moisture removal; after late November, multiple coverings should be used only for insulation and anti-freezing, and the covering in the greenhouse should be promptly uncovered during the day to facilitate the plant growth. For light growth, in the early stage, the grass thatch of the small shed can be covered late and uncovered early to increase the lighting time. Pay attention to ventilation, cooling and dehumidification before noon. In the later stage, the grass thatch of the small shed should be covered early and uncovered later. The ventilation volume will gradually decrease as the temperature drops. Ventilation is not required in severe cold weather. In rainy, foggy and snowy weather, the thatch should also be removed during the day to allow the plants to receive scattered light for photosynthesis. ② Fertilizer and water management. After planting and before slowing down the seedlings, they should be watered frequently to prevent wilting due to lack of water. Due to the high planting density of kale and Cantonese cabbage, they have many leaves, require large amounts of fertilizer, and have weak fertilizer absorption capabilities, so they have strict requirements for fertilizer and water. The yield and the quality of the sprouts are closely related to the quality of fertilizer and water management. Generally, starting one week after planting, top dressing is applied every other week. Apply 5 to 6 kilograms of urea per mu (200 times to water) each time. When the plants are budding, increase the amount of top dressing, apply 7 to 10 kilograms of urea per mu, and compound fertilizer. 5 to 10 kilograms. If the side sprouts are to be harvested, top dressing should be applied once after the main sprouts are harvested, and 5 to 8 kilograms of urea per mu should be applied.

(5) Pest control. The incision is susceptible to soft rot, so it should be cut at an angle when harvesting. In addition, there are downy mildew, sclerotinia, etc., which should be prevented. Spray pesticides as soon as possible after the onset of the disease. Referring to the winter cultivation of lettuce, the main pests include diamondback moth, cabbage caterpillar, aphids, cabbage borer, etc. Less harmful in winter.

(6) Harvesting. Both cabbage and kale are best harvested when large flower buds appear but have not yet opened. At this time, the sprouts grow to their maximum size and the quality is the best. When harvesting the main sprouts, 4 to 5 basal leaves must be retained, of which 2 should be retained. ~ 3 pieces of strong old leaves to facilitate the germination and growth of the side buds. About 20 days after the main sprouts are harvested, the side sprouts can be harvested when they grow to 17-20 cm. When harvesting the side sprouts, the same 2 ~ 3 basal leaves are used to form the second side tomb. After each sprout is harvested, fertilizer and water management is strengthened. The yield and quality of the side sprouts can exceed those of the main sprouts. The supply period is from December to April of the following year, and the yield per mu is about 2,000 kilograms.