In view of the problem of low application rate of organic fertilizers, partial application and excessive application of chemical fertilizers in leafy vegetables, the basic fertilizers are mainly based on organic fertilizers, and the topdressing fertilizers are mainly available nitrogen fertilizers, combined with application of phosphorus and potassium fertilizers. Application of calcium and magnesium fertilizers.
Application of organic fertilizer: Apply about 3,000 kg of organic fertilizer that has been decomposed and harmlessly treated per mu.
Application of NPK: The output level per mu is below 1500 kg, 12 kg of nitrogen fertilizer, 6 kg of phosphate fertilizer and 9 kg of potash; the output level per mu is 1500-2000 kg, 11 kg of nitrogen fertilizer is applied, and 5.5 kg of phosphate fertilizer is applied. Potassium fertilizer 8.5 kg; the output level per mu is more than 2000 kg, 10 kg of nitrogen fertilizer, 5 kg of phosphate fertilizer and 8 kg of potassium fertilizer.
Fertilization ratio: base fertilizer, generally 100% organic fertilizer and 100% phosphate fertilizer and 20% nitrogen and potassium fertilizer as base fertilizer before planting or transplanting. The amount of seedling fertilizer is generally 10% of the total amount of nitrogen and potassium fertilizer applied. In the prosperous growth period, the amount of fertilizer applied is generally 80% of the total amount of nitrogen and potassium fertilizer applied, and it is insisted on topdressing and topdressing once every 10 days. In addition, most leafy vegetables are hi-calcium and hi-magnesium crops. For areas where soil exchangeable calcium and magnesium are below the critical value, calcium magnesium phosphate fertilizer should be used, 10-20 kg of lime per acre, or at the seedling stage. Spray 0.3% calcium chloride solution or 0.25%-0.5% calcium nitrate solution in vigorous growth period to prevent leafy vegetables from seriously affecting product and quality due to physiological calcium deficiency or magnesium deficiency.
Application of organic fertilizer: Apply about 3,000 kg of organic fertilizer that has been decomposed and harmlessly treated per mu.
Application of NPK: The output level per mu is below 1500 kg, 12 kg of nitrogen fertilizer, 6 kg of phosphate fertilizer and 9 kg of potash; the output level per mu is 1500-2000 kg, 11 kg of nitrogen fertilizer is applied, and 5.5 kg of phosphate fertilizer is applied. Potassium fertilizer 8.5 kg; the output level per mu is more than 2000 kg, 10 kg of nitrogen fertilizer, 5 kg of phosphate fertilizer and 8 kg of potassium fertilizer.
Fertilization ratio: base fertilizer, generally 100% organic fertilizer and 100% phosphate fertilizer and 20% nitrogen and potassium fertilizer as base fertilizer before planting or transplanting. The amount of seedling fertilizer is generally 10% of the total amount of nitrogen and potassium fertilizer applied. In the prosperous growth period, the amount of fertilizer applied is generally 80% of the total amount of nitrogen and potassium fertilizer applied, and it is insisted on topdressing and topdressing once every 10 days. In addition, most leafy vegetables are hi-calcium and hi-magnesium crops. For areas where soil exchangeable calcium and magnesium are below the critical value, calcium magnesium phosphate fertilizer should be used, 10-20 kg of lime per acre, or at the seedling stage. Spray 0.3% calcium chloride solution or 0.25%-0.5% calcium nitrate solution in vigorous growth period to prevent leafy vegetables from seriously affecting product and quality due to physiological calcium deficiency or magnesium deficiency.
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