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Fertilizing prior to soybean production is not a common practice in Iowa. Nutrient deficiencies in soybean are rare and current recommendations in Iowa are to apply additional nutrients only if soil tests indicate that a specific nutrient is at a low concentration or if deficiencies are identified in the field. Deficiencies are rare even though the soybean plant requires more nitrogen than corn, and as a result can fix up to 50% of its own nitrogen.