The potential for herbicide injury with preemergence herbicides is greater with soybean than corn. The risk increases with environmental conditions that reduce crop vigor and growth rate, and also with heavy rain that moves the herbicide to the depth of the germinating seed or emerging seedling. Much of the state has experienced these conditions, thus it is likely symptoms will be found in many fields as people return to the field with the improved weather.
Iowa State University
Hartzler, Robert G., "Evaluating Herbicide Injury on Soybean" (2017). Integrated Crop Management News. 2423.
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