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Cracking refers to cracking of Chinese cabbage leaves. Cabbage period of Chinese cabbage is the period when most nutrients and moisture are needed, and it should meet its requirements for water and fertilizer in time. 1. If the water supply in the early period is insufficient, excessive water supply in the later period will cause cracking of the leaf ball. 2. Continue to top-dressing in the later period of the ball, that is, the inner leaves continue to grow after the top-dressing. The size of the outer leaf has been established, and the leaf ball will be cracked under the pressure of the inner leaf ball. 3. If the leaf ball has matured and fails to be listed in time, it will also cause cracking. 4. Long-distance transportation or storage of preserved Chinese cabbage can only be harvested when it matures at 80 to 90 percent. If harvesting is too mature, leaf ball cracking may also occur during transportation or preservation. Cracked leaf balls can also cause soft rot or other pests. Therefore, pay attention to the uniform water supply in the cultivation, and the fertilizer should be stopped in the later period. If it can not be listed, it can be cut root in situ to prevent the root system from absorbing water and nutrients.