The pressure to plant fields in a timely fashion frequently results in delayed application of preemergence herbicides due to rain or windy conditions. This situation isn’t as troublesome as it would have been in the past due to the availability of effective postemergence herbicides; however, establishment of weeds with the crop can result in yield loss early in the season if not managed properly.
Iowa State University
Hartzler, Robert G., "Early-Season Weed Competition" (2009). Integrated Crop Management News. 664.
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