sowing date

It can be planted in Beijing all year round. Early-maturing varieties such as willow leaf Chinese kale are cultivated in the open field to ensure the supply from June to October. Sowing from September to March of the following year can be carried out with medium and late-maturing varieties such as Zhonghua and Zhongchimustard for protected cultivation, so as to ensure the supply from November to May of the following year. It should be noted that July to September is a hot and rainy season in Beijing, and it is appropriate to plant in a cold place.

Seeding methods: direct seeding or seedling transplanting can be used, and seedling transplanting is mostly used in Beijing, and 75-1g seeds are needed per mu. The nursery site should be sandy loam or loam with convenient irrigation and drainage, and it is best to use the land where the previous crop is not cruciferous vegetables. When preparing the soil, we should apply more decomposed organic fertilizer and sow by sowing. Nursery beds should always be kept moist, quick-acting fertilizers should be applied for 2 ~ 3 times at seedling stage, and the sowing amount should be appropriate, so as to avoid the seedlings from growing into thin and weak seedlings in vain. The seedling age can reach 5 true leaves in 25 ~ 35 days. Generally, the interval between seedlings is carried out after two true leaves appear. The standard of excellent and strong seedlings is to choose tender and strong seedlings with good growth, strong stems and large leaf area, and it is not suitable to use small and old seedlings.

soil preparation and fertilization, select loam with fertilizer and water conservation, finely prepare soil, and apply 3,-4,kg of decomposed pig manure, compost and 25kg of calcium superphosphate as base fertilizer per mu, turn it into soil, mix it evenly, till it is flat, and fine soil particles. Flat beds are generally used, but small high beds should be used in summer cultivation.

field planting technology, seedling planting should be carried out in the afternoon, and protected cultivation should be carried out in the morning. After the date of planting seedlings is determined, water the seedbed the afternoon before planting seedlings to facilitate digging seedlings the next day. On the day of planting, the seedlings are dug, and then transported to the planting plot, and the seedlings are planted according to a certain row spacing. Generally, the row-plant spacing of early-maturing seeds is 25cm× 2cm, that of middle-maturing seeds is 3cm× 22cm, and that of late-maturing seeds is 3cm× 3cm. Seedlings should not be planted deep, and the soil surface and border surface of seedlings should be planted flat or slightly lower by 1 cm. After the seedlings are planted, water them immediately to restore their growth. Folding field management watering and fertilization

Chinese kale was watered in time according to the temperature and humidity at that time.

properly control watering during the growth period of leaves after slow seedling. When entering the forming period and harvesting period of cabbage moss, it is necessary to increase the number of watering and keep the soil moist frequently. Pay equal attention to base fertilizer and topdressing, and topdressing should be applied with water. Generally, a small amount of nitrogen fertilizer or chicken manure should be topdressing 3-4 days after seedling delay, and appropriate quick-acting fertilizer or human excrement should be topdressing when bolting. After harvesting the main moss, topdressing should be applied 2 ~ 3 times to promote the growth of the lateral moss. The early growth of Chinese kale in intertillage is slow, and weeds are easy to grow between plants, so intertillage weeding should be carried out in time. With the growth of the plant, the stem becomes thicker from thin, the base is thinner, and the upper part is larger, forming top-heavy. It is best to combine intertillage to cultivate soil and fertilize, and it is best to apply 1 ~ 2 kilograms of organic fertilizer per mu. Folding harvesting processing When the flower stems grow to be flush with or close to the top of the leaves (commonly known as Qikouhua), it is a suitable harvesting period, and the harvesting height is 15-25 cm. In order to maintain good commodity, it is advisable to harvest in the early morning and arrange and package.