Prolonged wet periods often disrupt the normal sequence of field operations. Some fields may be planted before nitrogen and/or pre-emergence herbicides are applied. While UAN (urea-ammonium nitrate) and many pre-emergence products can be applied to emerged corn, using UAN as a herbicide carrier enhances the foliar activity of products and may result in foliar damage. Check herbicide labels for restrictions on use of UAN as a carrier.
Iowa State University
Hartzler, Robert G. and Sawyer, John E., "UAN and Herbicides on Emerged Corn" (2013). Integrated Crop Management News. 81.
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