About 30 days after the onion has returned to green, it will enter the leaf growth stage and will require an increase in the amount of fertilizer, and 15 to 20 kg of ammonium sulfate will be applied per acre. After 50 to 60 days after returning green, bulbs begin to swell, which is also a critical period for top-dressing. Each acre is followed by 20-25 kg of ammonium sulfate, with a suitable amount of potash, or with water, dilute feces. Bulb expansion period, according to the appropriate amount of fertilization. For late-maturing varieties, when the size of the bulb has a walnut, ammonium sulfate can be applied along the water, 15~25 kilograms per mu to ensure that bulbs continue to expand. Spring onions were topdressed after easing seedlings, leaf growth, bulb expansion, and bulb expansion.
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