Gettysburg, PA | I was thinking of red or crimson clover as a legume that would/should overwinter for you. I can't speak on canola directly as I haven't seen it here but, that is another good thought.
It is dangerous to make recomendations when not familiar with the area. But, using some common principles: you want to follow cover crop with corn so you should lean toward the legumes of course. Here, a cover crop that overwinters is desirable in order to have something growing moisture out in the spring so a legume that overwinters is desirable. Clover fits those two criteria very well. Adding the other warm season legumes and broadleafs you've mentioned seems very advantageous.
Edited by conservation cop 11/8/2012 13:44
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