Fertilization of green onions differs due to winter onions and shallots.
1, winter onion fertilization seedbed bed fertilization and Honda fertilization. The seedbed fertilization is mainly based on organic fertilizer. The organic fertilizer is 2,000-3000 kg and the superphosphate is 40-50 kg. Before wintering, there is no need for topdressing. After returning to green, the fertilizer is applied 1-2 times before planting, and 5 kg of urea per mu is applied. About 10 kg of high-concentration compound fertilizer.
Honda base fertilizer combined with 5,000 kg of organic fertilizer, 25-30 kg of high-concentration compound fertilizer or 40-60 kg of bio-organic fertilizer. After the planting of the green onion and topdressing, the beginning of the leaf is beginning to take place. Generally, it is combined with the cultivating and applying one time to “grab the leaf fertilizerâ€, and the acre of cake fertilizer is 150 kg. If the fertilizer is applied, it should be mainly nitrogen and potassium fertilizer, and 10-15 kg of urea, 10 kg of potassium chloride or potassium sulfate should be applied to the ditch or in the ditch. During the formation of scallions, 10-15 kg of urea, 15 kg of potassium chloride or potassium sulfate, or 25 kg of high-concentration compound fertilizer are applied. In the later stage of growth, it is generally unnecessary to apply fertilizer.
2. Green onion fertilization The green onion has a short growth period, and the fertilization is heavy in the early stage, with the main goal of promoting the growth of young leaves and sheaths. Regardless of spring sowing green onion or autumn sowing shall be applied to the base fertilizer, generally 5,000 kg of organic fertilizer and 20-25 kg of high-concentration compound fertilizer.
On the basis of the application of organic fertilizer, spring sowing summer shallots, after entering the long-term, generally topdressing once every 20 days, each application of urea 5-10 kg, potassium chloride or potassium sulfate 10 kg. The shallots harvested in spring and summer should be controlled before and after winter, and the seedlings should be promptly seeded after returning to green, and 10-15 kg of urea should be applied per mu. After that, the quick-acting nitrogen fertilizer should be applied once every 20 days, and 5-10 kg of urea per mu should be applied. Apply appropriate amount of potassium fertilizer.
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