Matters needing attention in fertilization of leafy vegetables

In view of the outstanding problems existing in the fertilization of leafy vegetables, such as low application rate of organic fertilizer, partial application and excessive application of chemical fertilizer, we insist that the base fertilizer is mainly organic fertilizer, topdressing is based on available nitrogen fertilizer, combined with phosphorus and potassium fertilizer, and pay attention to the application of calcium and magnesium fertilizer.

Application of organic fertilizer: about 3000 kg of mature and harmless organic fertilizer is applied per mu.

Application of nitrogen, phosphorus and potassium: if the yield level is less than 1500 kg per mu, 12 kg of nitrogen fertilizer, 6 kg of phosphorus fertilizer and 9 kg of potassium fertilizer shall be applied per mu; if the yield level is 1500kg to 2000kg per mu, 11kg of nitrogen fertilizer, 5.5kg of phosphorus fertilizer and 8.5kg of potassium fertilizer shall be applied per mu; if the yield level per mu is above 2000 kg, 10 kg of nitrogen fertilizer, 5 kg of phosphorus fertilizer and 8 kg of potassium fertilizer shall be applied per mu.

Fertilization ratio: base fertilizer, 100% organic fertilizer, 100% phosphate fertilizer and 20% nitrogen and potassium fertilizer are used as base fertilizer before sowing or transplanting. The amount of seedling fertilizer is generally 10% of the total amount of nitrogen and potassium fertilizer. During the vigorous growth period, the amount of fertilizer applied is generally 80% of the total amount of nitrogen and potash fertilizer, and adhere to topdressing every 10 days or so. In addition, most leafy vegetables are calcium-loving and magnesium-loving crops. For places where soil exchangeable calcium and magnesium are lower than the critical value, calcium magnesium phosphate fertilizer should be selected and 10 kilograms of lime per mu should be applied, or 0.3% calcium chloride solution or 0.25% calcium nitrate solution should be sprayed in the seedling stage and vigorous growth period to prevent leafy vegetables from seriously affecting the product and quality due to physiological deficiency of calcium or magnesium.