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The amount of rainfall received during the first few weeks following residual herbicide application is an important factor that will influence potential herbicide carryover. When adequate rainfall is not received during this time, the chemical and microbial processes needed to degrade herbicides in the soil will be reduced. Rainfall occuring later in the season will have much less effect on herbicide degradation than if it had occured near the time of herbicide application.
Read this article from RoundupReadyPLUS.com to learn more about the risk of herbicide carryover.