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. Insufficient soil moisture will result in small and not compacted pellets. After heading, the leaf ball tissue is brittle and tender, 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, while round-headed and flat-headed varieties have more cracked bulbs; 2. Choose a flat, Plant cabbage in soils with convenient irrigation and fertility; 3. Strengthen water and fertilizer management, apply sufficient base fertilizer, and apply more organic fertilizers to enhance soil water and fertilizer retention capacity to buffer the impact of excessive, insufficient and drastic changes in soil moisture 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, to avoid flooding, and there should be no accumulation of water on the ground after watering; 5. Harvest in time, overripe leaf bulbs are easy to crack.
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