Planting the Iowa 2007 corn crop is somewhat behind recent years, and in efforts to stay ahead of the game, many fields will be planted before being treated with nitrogen (N) and/or herbicides. Corn in some of these fields will emerge before applications of these materials are made, raising concerns over the safety of postemergence applications of urea-ammonium nitrate (UAN) solution, with or without herbicides.
Iowa State University
Owen, Michael D.; Sawyer, John E.; and Hartzler, Robert G., "UAN and preemergence herbicide applications on emerged corn" (2007). Integrated Crop Management News. 1085.
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