First, the seedling period. The root system is underdeveloped and has weak absorption. Therefore, it is necessary to supply sufficient water in a timely manner, adhere to the water pouring, and promote root growth. A top dressing is done when the heart is broken. Each time the seedlings are combined with cultivator, top dressing is applied to raise seedlings.
Second, the rosette period. This period is the period when Chinese cabbage grows rapidly. In this period, water and fertilizer management must be strengthened to promote plant growth. After Dingmiao or after plant rejuvenation, should be in the interline or between the strains open hole or small ditch fertilization, per acre topdressing compound fertilizer 20 kilograms or ammonium sulfate 20 kilograms, top dressing after pouring a permeable, after depending on the soil dry and wet conditions for watering .
Third, the ball period. This period is the time for the formation of Chinese cabbage products. It requires a lot of fertilizer and water, water and fertilizer management during the ball stage, and focuses on the beginning and the middle period of the ball-making, that is, the pumping manure and the manure, both of which require the use of available fertilizers. And should be applied in advance, immediately after the start of the center of the dressing, apply 15 to 20 kg of ammonium per acre, in the plant after the pumping cylinder after a topdressing, combined with irrigation after top dressing, irrigation method to slow water irrigation method it is good. Irrigation should be stopped 10 days before harvest to prevent the ball from being too resistant to storage due to excessive water content.
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