The most common symptom of Brassica oleracea is cracking on the top of the leaf bulb and sometimes cracking on the side. Most of the cracks are one line, and there are also cross cracks. The degree of dehiscence is different. In light cases, only a few layers of leaves outside the leaf bulbs are cracked, and in severe cases, the cracks can be as deep as shortened stems. The main reason for leaf bulb cracking is that the cells absorb too much water and expand and crack. If the soil moisture is insufficient, the balls will be small and not tight. However, after heading, the leaf ball tissue is fragile and the cells are less flexible. Once the soil moisture is too much, the leaf ball will easily crack.
Preventive measures: 1. Choose varieties that are not easy to crack. Cabbage varieties have different cracking conditions. Generally, there are fewer cracked bulbs in pointed-headed varieties, and more cracked bulbs in round and flat-headed varieties. 2. Choose a soil with flat terrain, convenient irrigation and drainage, and fertile soil to grow cabbage. 3. Strengthen water and fertilizer management, apply sufficient base fertilizer, and apply more organic fertilizers to enhance soil water and fertilizer retention capacity, so as to buffer the influence of too much, too little and drastic changes in soil water on plants. 4. Cabbage requires a lot of water, so it needs to be watered many times throughout the growth period. Watering should be appropriate, with soil moist as the standard, avoid flooding, and there should be no accumulation of water on the ground after watering. After the rain, remove the field water, especially the heavy rain after the cabbage heads, and the ground area is water, which is easy to produce a large number of cracked balls. 5. Harvested at the right time, overripe leaf bulbs are easy to crack.
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