This is by far one of our favorite publications in determining withdraw periods of vaious cover crop species. You can build your cover crop mixture around the chemical application or plan your chemical choices around your desired cover crop! All the information is displayed in really well designed charts. ITS A MUST READ!
http://wcws.cals.wisc.edu/wp-content/uploads/sites/4/2013/03/WCWS_201_Herbicide_Rotation_Restrictions_WEB.pdf
