First, choose the appropriate variety. In order to prevent the early convulsions of spring cabbage, the use of strong anti-seizure varieties of winter is the key to successful cultivation. At present, the more suitable varieties are "Spring and Summer King", "Yang Chun", "Japanese Spring General" and other varieties. Second, apply basic fertilizer fine soil preparation. The plots of Chinese cabbage cultivated in spring are best to be cultivated before winter. After the thawing of soil in late spring, 5,000 kg per mu will be applied after the soil is thawed. After the ploughing, the ploughing will be done in 1 to 1.2 meters, and the length will be about 20 meters. should. Third, timely sowing. Usually broadcast from late March to early April. If soil moisture is not good in early spring, watering can be made 7 to 10 days before sowing. When sowing, each pod of 2 to 3 rows, namely spacing 40 ~ 50cm, hole spacing 35 ~ 40cm, every 5 to 6 seeds per hole, with a species of 75 to 100 grams per acre, cover film after sowing, increase the temperature, To Miao Qi Miao whole. Fourth, and time seedlings, reasonable dense planting. Seeding 4 to 6 days after emergence, seedlings promptly broken film induced seedlings, so that the cotyledon exposed plastic film, and the use of clods to compact membrane holes to prevent burning seedlings. After the seedlings were broken, 3 to 4 true leaves were seeded once and 5 to 6 true leaves were planted. Fifth, fertilizer and water management. Spring cabbage should be promoted in the end, strengthen fertilizer management, timely cultivator, and promote root development. It requires pouring water once every 5 days. During the lotus stage, 20 kg of urea is recovered per mu, 20 kg of potassium sulfate or 25 kg of compound fertilizer per mu. Sixth, timely prevention of pests, timely harvest. The main disease of Chinese cabbage is downy mildew. During the seedling stage, it is necessary to spray antivirus carbendazim and carbendazim. At the same time, attention should be paid to spraying 1000-fold Dimethoate and 1000-1500 times phoxim against aphids and cabbage caterpillars. In the middle and late May of the year, the Chinese cabbage ball will reach 7-80%, which should be harvested in proper time. Because the temperature is already high during this period, it is easy to catch convulsions when the harvest is too late. At the same time, the leaf ball that is too tight may be rotted when exposed to high temperatures or rain. Coulometer, Water Quality Analyzer, Portable Coulometer, Versatile Coulometer INESA Scientific Instrument Co., Ltd , https://www.inesarex.com