Welsh onions are more fertile and, like other vegetables, are very sensitive to nitrogen, and the application of nitrogen fertilizer has a significant effect on yield increase. The amount of nitrogen absorbed by welsh onion was higher than that of potassium (1:0.9), and the absorption of potassium was higher than that of nitrogen (1:1.2). Every 3000 kilograms of scallion will need to absorb 8-10 kilograms of nitrogen, 1.5-1.8 kilograms of phosphorus and 9-11 kilograms of potassium. The onion's requirement for phosphorus is the most sensitive in the seedling stage. Phosphorus deficiency at seedling stage will seriously affect the final yield of green onions. If the phosphorus supply is adequate at the seedling stage, even if the phosphorus is insufficient after planting, the top dressing measures can still be achieved at a later stage. Yield. The application of potash fertilizer should be strengthened during the formation of light blue rice. In addition to nitrogen, phosphorus, and potassium, calcium, magnesium, boron, and manganese also have a certain influence on the growth of green onions. Under the condition of three factors satisfying supply, the effects of increasing calcium, manganese, and boron were the most significant, showing long, thick, light, and high yield. Specific fertilization methods are as follows:
The base fertilizer should be applied after the planting site is selected. The method of fertilizer application depends on the amount of fertilizer. When the quantity is large, it can be fully applied, and when it is less time, it should be applied to the bottom of the planting ditch, mainly based on organic fertilizer. In general, 5000-8000 kg of quality manure is applied per mu. Phosphorus-poor soil has 25 kg of calcium phosphate, 150 kg of plant ash or 8-10 kg of potassium sulfate per mu.
After on-planting, the onion seedlings grow slowly, gradually turning cold with the weather, and the onion strains enter a vigorous growth period. When the green onion grows into a swiftly growing period, the onion plant grows quickly, and when it grows lighter, it is top dressing. For the first time, fertilizer was applied at a rate of 4,000 kilograms of soil-fertilizer per acre on the ridge back, or 150 kilograms of cake fertilizer was applied. After the application, the soil was mulled once and watered once. After 15 days or so, the second time to recover fertilizer, 750 kilograms of human excrement or 100 kilograms of plant ash, 30 kilograms of superphosphate, combined with deep sorghum after fertilization, soil, then watering. After another 25-30 days for the third topdressing, topdressing 15-25kg of nitrogen fertilizer per acre, topdressing, watering, earthing, this time, light blue and white weight gain and 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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