The cultivation of Chuncao cabbage is favored by vegetable farmers for its good economic benefits, and the cultivation area has also been expanding year by year. However, due to improper varieties and cultivation techniques, it is not rare that the unripe convulsions suffer losses. Therefore, the selection of varieties and the corresponding cultivation techniques are the key to the success of cultivated spring cabbage. In recent years, the Beijing Vegetable Research Center has developed a series of spring cabbage varieties that have been promoted throughout the country and the market has responded well. The introduction is as follows. I. Jingchun Spring Cabbage Variety Introduction “King Chun Wangâ€: The Beijing Vegetable Research Center bred a precocious hybrid and was harvested 50 to 55 days after planting. Antiviral, downy mildew, and soft rot, moderate tics, and good quality. The outer leaves are green and the leaves are piled in piles. The ball is 22.8 cm high, the ball is 15.6 cm wide, and the single ball weighs 1.6 kg. In 2000, it was approved by the Beijing Variety Approval Committee. “Jingchunchunzaoâ€: The Beijing Vegetable Research Center bred a very early-generation hybrid, which was harvested 45 to 50 days after planting. Antiviral, downy mildew, and soft rot, with moderate seizure resistance and excellent quality. The outer leaves are dark green, wrinkled, with white petiole, overlapping leaves, 22.5 cm in height, 16 cm in width and 1.3 kg in weight. The variety is also heat resistant and can be used as a summer sowing variety. In 2000, it was approved by the Beijing Variety Approval Committee. “Jingchunbai†(98-7): The Beijing Vegetable Research Center bred a precocious hybrid, which was harvested 55–60 days after planting. Antiviral diseases, downy mildew and soft rot, strong seizure resistance, good quality. The outer leaves are green, and the piles are encircled in the leaves. The height of the ball is 27.4 centimeters, the ball is 19.2 centimeters wide and the single ball weighs 2.7 kilograms. "Jing Chun Lu Green" (98-8): The Beijing Vegetable Research Center bred a precocious hybrid, which was harvested 50 to 55 days after planting. Antiviral diseases, downy mildew and soft rot, strong seizure resistance, good quality. The outer leaves are dark green, the leaves are light yellow, and the leaves are piled in the middle. The ball is 25.7 centimeters high, the ball is 14.3 centimeters wide and the single ball weighs 2.2 kilograms. "Jingchun 99" (99-1): The Beijing Vegetable Research Center bred a very early hybrid, which was harvested 45 to 50 days after planting. Antiviral diseases, downy mildew and soft rot, strong seizure resistance, good quality. The outer leaves are green and the piles are encircled in the leaves. The ball is 24 cm high, the ball is 16.4 cm wide and the single ball weighs 2.1 kg. Second, the spring cabbage cultivation techniques (a) selection of early maturity, disease resistance, resistance to picking good varieties of good resistance to bolting is the key to the success of spring cabbage cultivation. Different regions can choose different varieties according to local climate and cultivation conditions, consumption habits and different cultivation methods. Spring cultivation can use the above five varieties. Since greenhouses and greenhouses have better insulation conditions, they can be planted earlier and planted earlier, but there are also many opportunities to encounter low temperatures at the same time. Therefore, it is required that the varieties have strong twitch resistance, and the low-temperature growth rate should be faster, and varieties with strong cultivars can be selected. Beijing Spring White, Beijing Spring Green, Beijing Spring 99. (B) timely sowing, a reasonable close planting 1, open field live, mulching film cultivation due to low temperatures in early spring, temperature rise slowly, in order to avoid the low temperature vernalization after the sowing of cabbage, open direct broadcast should not be too early, otherwise easily lead to pre-convulsions. It is generally conducted when the temperature rises steadily above 13°C. The sowing time varies from place to place because of the temperature rise. For example, in the middle and late March of the planting period in Zhejiang and southern Jiangsu, planting in the middle and late April in northern China, and planting in Inner Mongolia in May. The growth period of spring cabbage is short, suitable for dense planting, which is conducive to high yield. The row spacing is 3350 cm and the colonization density is 3500-4000 plants per mu. 2. Although it is not appropriate to broadcast live seedlings for transplanting, it should not be sown too late. Due to the rapid increase in temperature at the late stage of growth, there is a lot of rain, the ball is not true, the pests and diseases breed, and the quality and yield are reduced. Therefore, nursery seedlings are often used for protection and transplanted in a timely manner. This not only raises the morning market, increases output value, but also reduces pests and diseases and improves quality. The seeding period for transplanting seedlings depends on the climatic conditions and cultivation methods. Generally, the minimum night temperature of the cultivation conditions is required to stably rise above 13°C. The sowing date is one month ahead of the planting date, ie, the seedling age is one month, and the number of planting leaves is about 6 to 7 pieces. The seedling age in warm regions such as Guangdong and Fujian is 15 to 20 days. Better greenhouse conditions should be selected. The night temperature should be above 15°C, and the minimum temperature should not be lower than 13°C. The use of plastic nutrients (diameter 8cm) nursery or nutrition earth seedlings can be. The nutrient soil formula can be mixed with the same amount of peat and field soil, or the mixture of decomposed manure and field soil in a ratio of 3:7. Use 80-100 grams per acre. 1) Cultivation in open field Heilongjiang region: Planting seedlings in the greenhouse on April 5, planting on May 5, and mulching or filming when planting. Beijing and its surrounding areas: Planting seedlings in the greenhouse around March 10, planting on April 10, using flat ridges, planting cover membranes, harvesting from the end of May to the beginning of June. South of Jiangsu: In the middle and middle of March, greenhouses or small sheds were used to plant seedlings, planted in mid-April and covered with mulch when planted. Fuzhou and other South China regions: from January to February, seedlings were planted on thermal insulation, planted from February to March, and covered with mulch when planted. 2) Cultivation of greenhouses or cultivation of small and medium sheds with double membranes Beijing and its surrounding areas: Planting seedlings in greenhouses on or about February 5, planting greenhouses on March 5, planting ridges and covering mulch. Harvested before and after the May Day. Yellow River Basin: Planting seedlings in early February and planting greenhouses in early March. Before planting, cover the mulch on the ridge or rake, and shed management. Harvested in early May. 3) Greenhouse cultivation varies according to local climate and greenhouse conditions. For example, Beijing and its surrounding areas will plant seedlings in the greenhouse around January 25th, and plant greenhouses on February 25th, using ridges to plant and cover the mulch. Harvested before the May Day. (III) Field management 1. Temperature management shall be conducted in greenhouses, greenhouses or small sheds, kept at a temperature of 13°C or more as much as possible during the night. In the early stage, the air was dehumidified every day to reduce the occurrence of downy mildew on the basis of heat preservation; in the middle and late period, the heat was preserved during the night and the temperature was mainly reduced during the day until the shed film was completely removed. The maximum temperature was maintained at about 25°C. After the planting, the use of cover film to protect the cold, with the temperature rising, and gradually breaking the film, about half a month later, when the minimum temperature rises above 15 °C, it will change to the film or all the film. After the removal of the membrane, weeding and weeding were performed to increase the temperature and promote the development of the root system. 2. Fertilizer and Water Management As the temperature of early spring cabbage cultivation is relatively low, it is rapidly heated during the later period of cultivation, which is unfavorable for the growth of the cabbage. Therefore, the season for the growth of spring cabbage is shorter. In the management of the spring cabbage must be a "promote" word, a push to the end. Around this principle, in order to increase the temperature before removing the film, it is not appropriate to water it too much. After removing the film, timely cultivating is needed to promote root development. Before the planting, 3000 kg of high-quality farmyard fertilizer was used as basal fertilizer. Top dressing is carried out twice. After easing the seedlings, 10 kg of urea per mu and 10 kg of compound fertilizer can be topdressed. After entering the ball period, 10 kg of urea will be topped with water per acre. (D) Pest control Active prevention of dry heart disease, watering should be timely, dry water or dry and wet uneven is its main cause. In addition, adequately cooked farmyard fertilizer should be applied, and nitrogen fertilizer should not be used excessively. Once found in the field, the soft rot should be cleared in time and disinfected with lime in the diseased hole to reduce the spread of pathogenic bacteria. Aphids are the focus of pest control. Prevention and control of aphids must start from the greenhouse seedlings, nursery sites should try to avoid the source of the insects, but pass aphid on the need for continuous use of drugs to eradicate aphids clean, otherwise not only affect the growth of seedlings, and pest control after planting brought difficulties. The seedling stage concentration should be lower to prevent phytotoxicity. Prevention and control of locusts can be sprayed once again, etc., control of cabbage white butterfly and diamondback moth can be sprayed off white, vegetable moth enemy, card dead grams and so on. (5) The timely harvesting of Chinese cabbage must be timely harvested when it is mature, and excessive ripening can easily cause convulsions and leaf ball rot.