(1) Varieties are generally selected from winter evergreen and slow in February. (2) Seedlings are sown in late September to early October. The seeding rate is 0.4 to 0.75 kg per 667 square meters, which is approximately 2667 square meters. Fertilizers at the seedling stage should be suitable so that the seedlings do not reduce the cold resistance due to excessive fertilization. (3) Site preparation is the same as in spring cultivation. After field tillage, 50 kg of nitrogen, phosphorus, and potassium vegetable fertilizers are used as basal fertilizer for every 667 square meters, and a width of 2.5 meters (even ditch) is made. (4) The planting period for the planting of winter sowing Vegetables starts from the beginning of November until the end of January of the following year. Since this time is in the cold season, planting and planting should be done when planting. The neck of the cabbage is easily chilled and properly deep-rooted so that the root neck can be protected by the soil to avoid or reduce the freezing injury. The dense planting is conducive to the improvement of the microclimate temperature in the field, and can also reduce the invasion of the cold wind, which is beneficial to the growth of plants. Therefore, generally, the line spacing is 15 to 17 cm, and the plant spacing is about 8 cm. (5) Field management is basically the same as that of spring cultivation, but measures to prevent cold are to be strengthened, such as irrigating before a cold current, or covering with a non-woven surface. After the cold has passed, topdressing should be done in time to restore plant growth. (6) Harvesting winter sowing vegetables Due to the cold weather and slow growth, it takes 80 to 90 days from planting to harvesting, but in order to guarantee the off-season supply from January to February, it can also be advanced or postponed as required by the market. Every 667 square meters of output 1000 to 1500 kg. (7) The leave seeding method generally adopts the method of film retention, that is, selecting the better growing small vegetable plots and removing the impure single plants as seeding fields for harvesting in early June. Seeds of 40 to 50 kg per 667 square meters. The useful life of seeds is 2 years. China Agricultural Network Editor
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