Alfalfa is a key crop in Wisconsin, but if not successfully removed it can be troublesome in subsequent crops. This is especially true in no-till systems. Currently most no-till systems rely on glyphosate to remove the alfalfa prior to planting rotational crops the following spring. Glyphosate however will not be effective at removing Roundup Ready alfalfa, as it is engineered to tolerate this herbicide. In these situations other active ingredients will need to be used to remove the alfalfa crop. Detailed results from a Wisconsin study that evaluated the effectiveness of growth regulator herbicides in removing alfalfa are summarized below. This information as well as other data from across the United States will be presented along with specific recommendations for the upper-midwest.
Soil Science Extension
University of Wisconsin Madison