How to fertilize organic onions

How to fertilize organic onions? Please give guidance to organic onions which can be referred to the following fertilization methods: base fertilizer: organic base fertilizer with urea 15kg, diammonium 10kg, potash fertilizer 7kg, one-time application. Topdressing: topdressing in three stages. The first time: two weeks after transplantation, 6 kg of nitrogen fertilizer, 5 kg of phosphorus fertilizer and 4 kg of potassium fertilizer were topdressing. Spray Jigao organic fertilizer 25 ml, 15 kg water, once a week, 4 times in a row. The second time: four weeks after transplantation, 6 kg of nitrogen fertilizer and 4 kg of potassium fertilizer were applied. Jigao 20 kg organic fertilizer, 400 times water applied in furrow. The third time: six weeks after transplantation, 3 kg nitrogen fertilizer, 10 kg organic fertilizer and 400 times water were applied in furrow. Click to get more onion planting techniques click to get more vegetable planting techniques