Illinois Fertilizer & Chemical Association
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Corn Insecticide Seed Treatment And Foliar Fungicide Effects On Corn Response To Fertilizer Nitrogen

The current nitrogen use efficiency numbers for corn in Illinois ranges from 0.8 to 1.2 lb N/bu based on yield goal, previous crop, manure credits and other incidentals. Recent studies have enhanced the process of identifying optimum N needs based on N prices and value of corn (Nafziger et al, 2005). As N prices continue to escalate, further fine tuning of the nitrogen rate equation will be needed. Changes in yield potential associated with technological advances such as insecticide seed treatments (IST) and foliar fungicides should increase the need for additional fertilizer N. However, there are increased efficiencies of N use expected ...