Answer: About 30 days after turning green onions in autumn, the leaf growth period begins, and the fertilizer requirement increases, and 15-20 kg of ammonium sulfate is applied per mu. 50 to 60 days after turning green, the bulbs start to swell, which is also a key period for top dressing. Apply 20 to 25 kilograms of ammonium sulfate per mu, mix with a suitable amount of potash fertilizer, or irrigate dilute manure with water. Bulbs are in full bloom, fertilize as needed. For mid-to-late varieties, when the bulbs have the size of walnuts, ammonium sulfate can be applied down the water, 15-25 kg per mu to ensure that the bulbs continue to expand. Spring-planted onions were topdressed after slow seedling growth, leaf growth period, initial bulb expansion and bulb expansion phase.
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