This link displays the labeled withdraw periods of various corn chemicals on potential cover crops and is formatted into a simple chart. THIS DOES NOT INCLUDE ANY DOCUMENTED RESULTS BUT MOSTLY JUST REFLECTS THE LABELED SUGGESTIONS. Having said that, it can be utilized as a good comparison of common herbicide residuals.
http://extension.psu.edu/plants/crops/news/2013/07/herbicides-persistence-and-rotation-to-cash-and-cover-crops
