1, improper fertilization: because summer temperatures are high, many growers in order to promote the rapid growth of Chinese cabbage, blindly apply partial availability of nitrogen fertilizer, do not pay attention to the application of phosphorus and potassium fertilizer, resulting in excessive nitrogen fertilizer, phosphorus and potassium fertilizer deficiency, Making Chinese cabbage uninvolved or lax is not tight.
2, uneven water supply: the summer because of higher temperatures, rapid growth of cabbage, a large amount of water, if not timely watering and uniform watering, can easily cause the cabbage does not worry.
3, rain, humidity: the summer because of frequent rainfall, making the humidity of the cabbage field continue to increase, affecting the growth of cabbage, but also easy to produce without worry.
4. Inadequate control of diseases and insect pests: Diseases and insect pests of summer cabbage are more serious, especially soft rot, dry heart disease, downy mildew, powdery mildew, viral diseases, aphids, cabbage caterpillars, etc. The occurrence of these pests and diseases has to some degree affected The growth of Chinese cabbage vegetative bodies can cause the Chinese cabbage to be unwrapped.
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