First, the seedling period. The root system is underdeveloped and the absorption is weak. Therefore, it is necessary to supply enough water in time, insist on small water pouring, and promote root growth. When the heart is broken, a top dressing is carried out. Each time the seedlings are combined with cultivating, the thin fertilizer is used to raise the seedlings.
Second, the rose seat period. This period is a period of rapid growth of Chinese cabbage. In this period, water and fertilizer management must be strengthened to promote plant growth. After the seedlings or the plants are slowed down, the fertilization should be carried out between rows or between plants, and 20 kg of compound fertilizer or 20 kg of ammonium sulfate should be applied per mu. After topdressing, water should be poured once, and then the soil should be watered and wet. .
Third, the balling period. This period is the period of formation of Chinese cabbage products, which requires a large amount of fertilizer and water. The management of water and fertilizer during the balling period focuses on the beginning and the middle of the ball, that is, the pumping fertilizer and the heart-filling fertilizer. It should be applied in advance, and immediately apply fertilizer when starting the package. 15 to 20 kilograms of ammonium sulfate per acre is applied. After the plant is pumped, it can be applied once again. After topdressing, combined with irrigation, the method of irrigation is to slow water and slow irrigation. it is good. Stop watering 10 days before harvest to prevent the leaf ball from being too resistant to storage due to excessive water content.
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