The onion yield is high, but the onion root is a shallow root fibrous root system, and the suction fertility is weak. Therefore, sufficient nutrient conditions are required and the soil fertility is required to be high. Generally, for each 1,000 kilograms of onion produced, it is necessary to absorb 1.9-2.2 kg of nitrogen (N), 0.6-0.9 kg of phosphorus (P2O5), and 3.2-3.6 kg of potassium (K2O). Onion has different requirements for nitrogen, phosphorus and potassium at different growth stages. Seedling growth is slow, requires a small amount of fertilizer, mainly nitrogen; into the leaf growth period, the amount of fertilizer required and the absorption of fertilizer rapidly increased, at this time still dominated by nitrogen; in the bulb expansion period, the amount of growth and need The amount of fertilizers is still slowly rising, and potassium is the main ingredient. Increasing phosphorus and potassium fertilizers at this stage can promote bulb hypertrophy and improve quality; onion can not be deficient in phosphorus during the whole growth period. The absorption of nutrients by onion was the most potassium, followed by nitrogen, phosphorus and boron, among which nitrogen had the greatest effect on the growth of onion. In general soil conditions, applying nitrogen fertilizer can significantly increase yield.
In addition, onion application of copper, sulfur and other fertilizers to increase production better. Therefore, besides satisfying the requirement of nitrogen, phosphorus, and potassium for onion in production, the application of boron, copper, sulfur and other trace element fertilizers should also be emphasized.
Onion fertilization can be divided into two major parts, namely base fertilizer and topdressing. Onion planting plots should be applied to basal fertilizer, which is generally based on organic fertilizers. Apply 3000-4000 kg of organic fertilizer per mu and 50-80 kg of general-purpose compound fertilizer. Miao 15-20 kilograms of compound fertilizer is applied during the growth period of the leaves. In addition, the cultivator and loose soil should be diligently used in this period to increase the amount of water used to ensure the vigorous growth of plants. Into the bulb expansion period, should ensure adequate water and fertilizer supply. In order to promote the expansion of the bulbs, the general Mushi compound fertilizer 10-15 kg. When the bulb grows to 4 to 5 centimeters, top it again as appropriate.
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