In view of the low application rate of organic fertilizer, partial application and excessive application of nitrogen fertilizer in the fertilization of root and stem vegetables, as well as the ignorance of potassium fertilizer application, we insist on using organic fertilizer as the main fertilizer, and using phosphorus and potassium fertilizer as the main chemical fertilizer. The three elements of nitrogen, phosphorus, and potassium are used in combination, and special attention should be paid to the increase of potassium fertilizer in the middle and late stages. According to the principle of “one control, two promotion, three protection, four taboos”, the first control is to control the fertilization during the flowering period to avoid falling flowers, leaves and fruits; the second promotion is to timely topdressing during the young fruit period and the harvest period. Promote the rapid expansion of young fruits; the three guarantees are not to lose fat, not to grow, and not to be damaged by fertilizer; the four avoids are to avoid using high-concentration fertilizers, avoid topdressing with wet soil, avoid topdressing at high temperatures and avoid excessive topdressing.
Organic fertilizer application: about 3000 kg per mu.
Nitrogen, Phosphorus and Potassium application: If the yield per mu is more than 2500 kg, 10 kg nitrogen fertilizer, 7 kg phosphate fertilizer, and 10 kg potash fertilizer per mu; if the yield per mu is 2000 to 2500 kg, 9 kg nitrogen fertilizer and 6.5 phosphate fertilizer per mu are applied. , Potassium fertilizer 9 kg; if the yield per mu is below 2000 kg, 8 kg nitrogen fertilizer, 6 kg phosphate fertilizer, and 8 kg potash fertilizer are applied per mu.
Fertilization method: basal fertilizer, generally 3,000 kilograms of better-quality soil manure or pig and cow manure per acre before transplanting, while phosphate fertilizer and 30% nitrogen and potassium fertilizer are used as basal fertilizer for deep application. The amount of seedling fertilizer is generally 50% of the total amount of nitrogen and potassium fertilizers. During this period, topdressing should be done in stages, once every 10 days or so, to promote the growth of stems and leaves. Fertilizer for growing trees, the application amount is generally 30% of the total amount of nitrogen and potassium fertilizer to promote tuber swelling and increase yield. For melons, eggplants, fruits, and beans in the middle and late stages of growth, spray 0.2% potassium dihydrogen phosphate solution on the leaves for 2 to 3 times, which has a good effect.