Principles of fertilization: 1. Reapply organic fertilizer and fertilize soil; 2. Rationally cooperate with nitrogen, phosphorus and potassium to properly supplement medium and trace elements; 3. Strengthen topdressing management after rosette period. Fertilization recommendation: Before planting Chinese cabbage, according to the fertility of the soil, apply 2~3 square organic fertilizer per acre. Under the condition of 5000 kilograms of net vegetables per mu, it is recommended to apply 20~25 kg/mu of nitrogen fertilizer, 5~8 kg/mu of phosphate fertilizer and 25~30 kg/mu of potash fertilizer. The amount of the slimming material can be appropriately increased according to the level of the production level.
Fertilizer operation: Phosphate fertilizer is used as base fertilizer, 30% nitrogen fertilizer is used as base fertilizer, 70% is applied as top dressing; 50% potassium fertilizer is used as base fertilizer, and 50% is used as top dressing. Nitrogen and potassium topdressing can be applied 2 to 3 times after the rosette period.
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