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To be effective, a residual herbicide must be present in the soil profile where weed seeds germinate. These herbicides require moisture for activation, and without rainfall or irrigation after application, they can be less effective and allow weeds to become established. Factors that can affect the performance of soil residual herbicides are: weather, soil properties, surface residue, weed pressure, herbicide choice, and timing of application.
See what Roundup Ready PLUS® Crop Management Solutions is saying about weed control in soybeans needing residual herbicide performance.