Cover crops and soil residual herbicides can make a powerful weed control duo, but only if those herbicides actually reach the soil. The Pennsylvania State University, Virginia Polytechnic Institute and State University and University of Delaware researchers recently examined how much cover crops -- and cover crop management -- can prevent herbicides from reaching the soil, as well as which herbicide chemistries are more likely to wash-off cover crops through rainfall.
Planting green may call for herbicide adjustment
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Planting green into roll-crimped cover crops in Wallace’s study.
The University of Delaware team applies herbicides over roll-crimped cover crops at their study site.
The table shows pyroxasulfone deposition and recovery across cover crop species, growth stage at termination and residue management.
Dense roll-crimped cover crops block herbicides from reaching the soil.
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