When conventional application equipment can be moved through the field (i.e., the soils are dry enough and the corn is short enough), then injection of anhydrous ammonia or UAN solutions would top the list of best options. Next would come urea-ammonium nitrate solution (UAN) surface dribbled between corn rows, and then broadcast urea. Broadcast UAN solution should be avoided on corn larger than the V7 growth stage.
Iowa State University
Sawyer, John E., "Applying Additional Nitrogen After Wet Conditions" (2010). Integrated Crop Management News. 413.
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