Kill Annual Ryegrass Early

but not too early. Cover crops can be as easy to kill as having them freeze out, or as difficult to kill as Annual Ryegrass.  Many farmers I know have successfully planted soybeans into green cereal rye, but Annul Ryegrass is not so easy to get rid of.  Start by trying to kill it early.  It is too cold now. Wait until daytime temperatures are in the 50's so that some photosynthesis is taking place.  more details are available in a recent Prairie Farmer Article.