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Fertilizing onions is
Fertilizing onions is critical to success. Before planting, work 4 to 6 inches of well-composted organic matter and an all-purpose fertilizer (16-16-8) into the soil to a depth of 6-8 inches. Then, 4 to 6 weeks later, sidedress onions with nitrogen fertilizer (21-0-0) as directed. Do not fertilize after mid-July as extra nutrients stimulate late season growth and reduce storage potential of dry onions.