For every 1,000 kilograms of scallion produced, 2.7-3.3 kg of nitrogen, 0.5-0.6 kg of phosphorus, and 3-3.7 kg of potassium are needed, and the three nutrient uptake ratios are 5.45:1:6.09. In addition to a large number of elements, the application of trace elements calcium, magnesium, boron, manganese fertilizer, have a certain role in the growth and development of green onions. Before sowing, apply rotten organic fertilizer in nursery pods, generally applying 2000-3000 kilograms of fertilizer or composting per acre, and 40-60 kilograms of superphosphate. After deep-casting, apply the organic fertilizer. In order to keep the seedlings safe for winter, water should be poured before freezing. A few days later, sprinkle the finely-divided horse dung or earth-fertilizer on the ravioli, about 1 cm thick, in order to prevent freezing. After returning to young crops, 2000-3000 kilograms of soil-fertilizer can be applied per acre, or 10-15 kilograms of ammonium sulfate or 6 kilograms of urea can be applied. Before scallion colonization, apply base fertilizer. Generally, 4000-5000 kilograms of manure can be applied per acre. After deep plowing, the soil fertility is fully mixed. After leveling, the ditch is opened by row spacing, and 100-150 kilograms of cake fertilizer or 1,000 kilograms of human waste is applied per acre. Then the soil is mixed thoroughly. Loosening and colonization. After the fall, it is necessary to top-dress fertilizers in time, and organic fertilizers and quick-acting fertilizers will be applied in combination. For the first time, fertilizer was applied at a rate of 4,000 kilograms per mu for ridge backs, or 150 kilograms of cake fertilizer and 3,000 kilograms of fertiliser were applied. After the application, the water was poured once and watered once. After 15 days, the second top dressing was applied, and 750 kg of composted human urine was applied per acre, or 20-25 kg of ammonium sulfate, 10-20 kg of superphosphate, and 10-20 kg of potassium sulfate were applied. After fertilization, the soil is mixed with sorghum and then watered. After 25-30 days, the third fertilizer application is conducted. Apply 15-25 kg of ammonium sulfate or 7-10 kg of urea per acre. After top dressing, water and soil. Sharp Medical Device Protective Set Silicone Heat Sleeve,Medical Silicone Protective Set,Sharp Medical Device Protective Set,Sharp Medical Device Silicone Protective Set GUANGDONG JIANGMEN RONGHAI MEDICAL TECHNOLOGY CO.,LTD , https://www.kimaomedical.com