Every production of1000kg of leaf bulbs needs to absorb 4.1-4.8kg of pure nitrogen, 4.9-5.4kg of phosphorus (P2O5)1.2-1.3kg of potassium (K2O). Nitrogen, phosphorus and potassium should be absorbed throughout the growth period. The principle of fertilization is based on basic fertilizer, supplemented by topdressing, nitrogen fertilizer and phosphorus fertilizer, and organic fertilizer and chemical fertilizer can be used together if conditions permit. Generally, before planting Chinese cabbage, 5000 kilograms of decomposed farmyard manure and 50 kilograms of compound fertilizer are applied per mu for deep ploughing and soil preparation, and the application amount of base fertilizer accounts for 50% of the total fertilization amount. Topdressing should be mainly based on nitrogen fertilizer combined with phosphorus and potassium fertilizer.
Before planting, the land should be leveled, fully decomposed organic fertilizer should be applied, and high beds should be made, with two rows planted in each bed. If there is drought during planting, water the planting holes before sowing. Pay attention to watering every morning and evening after planting. It is more suitable to choose rotation land with deep soil layer, loose and fertile soil, good drainage, strong water and fertility conservation and close to water source. 15 ~ 20 days before planting, the kang soil should be deeply cultivated to ripen the soil, improve the soil structure and improve the soil fertility. Cabbage harvesting: Once the bulb of early-maturing cabbage is formed, it will quickly turn into the peak period of the bulb, and it will be harvested in time when the bulb is tight. Generally, the weight of a single ball is 0.5 ~ 0.7 kg, and the maximum weight exceeds 1 kg, with an average yield of about 5000 kg per mu.