First, select good varieties should use the short growth period, generally about 50 to 60 days, winter is strong, not easy to ripening the ball type. Suitable for planting varieties are Jianchun, Yangchun, strong, spring and summer kings. Second, nurturing strong seedlings The Chinese cabbage planted in the spring of that year could only be convulsed through vernalization. In order to make cabbages in early spring, vernal convulsions should be avoided. It is necessary to raise seedlings in greenhouses, hotbeds, or improved Yangshuo, and keep the temperature in the seedbed as low as 15°C as much as possible to avoid unnecessary temperatures and premature vernalization. The seedlings are generally sown at the end of December to the middle of January. Soak cabbage seeds with warm water, and then use water-permeable and breathable cloth on the place of 20 ~ 28 °C germination. When preparing nutritious soil, mix black soil, excreta, decomposed horse manure, and a small amount of sieved ash, and apply it to a 4 to 5 cm thick layer of mud. Use a fork to draw a 4 cm long and 4 cm wide earth, and then The seeds of freshly emerged buds were sown on each earth, and they could not be rebroadcast and missed. After sowing, they were covered with a fine layer of fine soil. Third, scientific colonization early spring small cabbage shed cabbage Chinese cabbage is generally planted in mid-March. The seedling leaves of Chinese cabbage should not exceed 6 pieces, and when more than 6 leaves are planted, it may cause vernalization. The row spacing is 50-55 cm, the plant spacing is 40-45 cm, and the number of plants per acre is 3,000. Fourth, fertilizer and water management due to the growth period of spring cabbage is only 50 to 60 days, so it is necessary to give enough base fertilizer, and to promote the main. That is, in the early stage of growth, more available nitrogen fertilizers, such as urea, are used to promote vegetative growth and allow rapid formation of rosette leaves and bulbs. Since the temperature and ground temperature are low during the seedling stage, watering should be controlled, and the middle cropping and soil conservation should be the mainstay. After the rosette leaf stage, fertilizer and water should be promoted. The ball stage should be relatively more potassium fertilizer, followed by nitrogen fertilizer. In general, 20-25 kg of potassium sulfate or potassium dihydrogen phosphate and 10-15 kg of urea are required per acre. In the early stage of the ball, 600-800 times of cabbage core agent can be sprayed for 2 or 3 times to make the core of the package firm. Fifth, prevention and treatment of pests In terms of summer and autumn cabbage, fewer pests and diseases of spring cabbage. In some plots, downy mildew may occur, and at the early stage of the disease, drugs such as B-aluminophosphate, Precore, and anti-virus can be sprayed. Insect pests mainly include aphids and cabbage caterpillars. The locust can be controlled by omethoate, vanillin and other agents. The cabbage caterpillar can use Bt emulsion, diflubenzuron 1, deltamethrin and other drugs to control insect pests 2 to 3 years old. 6. Timely harvesting of spring cabbage can be listed on the firmness of the ball, and the sooner the better, the harvest is completed before and after the grazing. If the harvest is too late, the temperature rises, causing the cabbage to decay.
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