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For good quality and high yield in Welsh onions, reducing nitrogen and increasing potassium fertilization is key
In recent years, in order to increase Welsh onion yields, many vegetable growers have blindly increased the use of chemical fertilizers, especially nitrogen fertilizers. According to surveys, on average, pure nitrogen applied to Welsh onions per mu is as high as 40-50 kg, and phosphorus pentoxide 10-15 kg, while potassium fertilizer is applied very little or not at all, resulting in Welsh onion yields not increasing but decreasing, and root rot becoming more severe...