The October ILF webinar contained some great information about weed management when using cover crops. Bob Hartzler, ISU Extension weed specialist, presented findings from a study done by graduate student Meaghan Anderson.
They researched the amount of rye cover crop biomass needed to suppress weeds in corn and soybean fields. They also explored the influence of several herbicide brands on different species of cover crops after corn and soybeans. The findings are worth noting:
Planting more rye to create more biomass did not correlate with the amount of lambsquarters (LQ) or waterhemp (WH) weed suppression.
The cover crop most sensitive to residual herbicide was radish, especially after corn, and the least sensitive was cereal rye.
Watch the archive recording of the webinar to get details and to hear Hartzler’s factors to consider when adding a cover crop to your corn-soybean rotation.