The top dressing is mainly based on the bottom fertilizer. When the bottom fertilizer is sufficient, the top stage of the growth may not be topdressed. At the beginning of the ball formation, the nitrogen fertilizer will be chased with water and the vegetable stems and stalks will be sprayed to promote the growth of the leaves; the second fertilizer will be pursued in 15-20 days. It is better to use NPK compound fertilizer, about 15-20 kg per mu; when the heart leaves begin to curl inward, apply a compound fertilizer once, about 20 kg per mu.
Pest control diseases mainly include downy mildew, soft rot, viral disease, dry rot, top burning disease, etc.; insect pests mainly include leaf miner, whitefly, aphid, thrips and so on. Pests and diseases should be based on the application of new high-fat membrane prevention, strengthen field management, use chemical pesticides to work with new high-fat membranes, reduce the use of highly toxic pesticides, become high-toxic, low-toxic, low-toxic and slightly toxic.
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