What can be done to minimize the risk of injury to rotational crops from residues applied during the previous growing season?

“Herbicide degradation simply takes time and moisture,” Hager says. “Soil moisture across much of Illinois is more abundant than at this time last year, but the activity of the soil microbial populations remains limited under the current soil temperatures.”



He added that shallow tillage can help distribute herbicide more evenly across a field and can help enhance herbicide degradation, especially when soil temperatures are warm and soil moisture is adequate. Early planting or planting a rotational crop that is very sensitive to the herbicide applied last season increases the likelihood of crop injury from herbicide carryover.

Ultimately, crop susceptibility determines whether persisting herbicide residues will cause problems. “Planting the same crop next season as was planted in 2012 would effectively eliminate the potential for crop injury from herbicide residues,” Hager says. “This solution may not be feasible for every situation where herbicide carryover is possible, but it is an option that warrants consideration.”



Hager suggests delaying planting as long as possible if crop rotation must occur where there is concern about herbicide carryover.

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