Herbicide applications may have the potential to result in carryover residues in soil that can injure rotational crops. This presentation describes national-scale soil carryover residue modeling from herbicide applications made in cereal crops to support safe plant-back intervals for rotational crops. A conceptual field dissipation model was developed based on laboratory and field environmental fate datasets. The model, calibrated and validated with data from field carryover trials, was simulated to predict spatial and temporal soil residues in cereal crop growing areas of the United States. Crop-specific residue thresholds derived from laboratory bioassays and field studies were used to evaluate the potential carryover effect on rotational crops. Crop-specific rotational intervals were determined based on the predicted soil residues and associated thresholds. Uncertainties in modeling results due to limited soil residue sampling time points were addressed by implementing a conservative modeling approach and taking into account bioassay and field injury information. The presentation will conclude with recommended crop rotational planting intervals following an herbicide application to cereal crops to minimize potential carryover effects.

Soil carryover residue modeling to support safe product use to rotational crops

256th National Meeting (2018)

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