The base fertilizer should be applied after the planting site is selected, mainly based on decomposed or semi-rotten organic fertilizer. Generally, every 667 square meters of vegetable field is applied to a good quality of 5000 to 8000 kg of cooked manure. Soil containing less phosphorus per 667 square meters applies 25 kg of calcium phosphate, 150 kg of plant ash or 8 to 10 kg of potassium sulfate.
After the planting, the onion seedlings grow slowly. When the rainy season is passed, the weather gradually turns cool, and the onion plants enter a vigorous growth period. Old leaves gradually turn yellow and new leaves continue to occur. With good nutritional status and dark conditions, it can promote the growth of multiple leaf and leaf sheaths. Immediately after the beginning of autumn, topdressing, and to master the application of organic fertilizers and quick-acting fertilizers. Every time fertilizer is topped, 4,000 kg of compost per 667 m 2 of soil is applied to the ridge back, or 150 kg of cake fertilizer or 3000 kg of sorghum soil is applied. Immediately after application, the soil is mulled once and watered once. After 15 days or so, recover the second fertilizer, apply 750kg of human excrement, or apply 100kg of plant ash, 30kg of ammonium humate, and 30kg of superphosphate. After fertilization, combine squats, and then apply soil and water it. After another 25 to 30 days for the third time, topdressing 15 to 25 kg of nitrogen fertilizer every 667 square meters, watering and soil after top dressing, and the scallion will rapidly increase in weight and be full until harvested. If the soil fertility is high and the base fertilizer is sufficient, the first top dressing may not be performed. For areas with short growing seasons and good soil fertility, the third fertilizer application may be dispensed with.
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