What to pay attention to when fertilizing during onion growth

Answer: About 30 days after the onion planted in autumn turns green, it enters the peak leaf growth period, and the amount of fertilizer required increases. 15-20 kg of ammonium sulfate per mu is applied. 50 to 60 days after turning green, the bulbs begin to swell, which is also a critical period for top dressing. Add 20 to 25 kg of ammonium sulfate per acre with appropriate amount of potassium fertilizer, or irrigate thin manure with water. During the peak period of bulb swelling, fertilize appropriately as needed. For mid- and late-maturing varieties, when the bulb is the size of a walnut, ammonium sulfate can be top-dressed along the water at 15-25 kg per mu to ensure that the bulb continues to expand. Spring onions were top-dressed after slow seedling, leaf growth period, bulb expansion initial period and bulb expansion period.

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