The rapid pace of planting in late April followed by rain has resulted in many fields having emerged corn before preemergence herbicides and nitrogen applications have been completed. Of particular concern are no-till fields where planting was completed prior to killing emerged weeds.
Iowa State University
Hartzler, Robert G. and Sawyer, John E., "Emerged Corn, Herbicides and Nitrogen" (2012). Integrated Crop Management News. 190.
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