Using a combination of crops seems best. Dan Blackledge is experimenting with Canola Seed from Germany: http://www.cadillacnews.com/story_news/?story_id=146464&year=2007 On Wed, Nov 19, 2008 at 3:33 PM, Rick Vargo <rick at vargo.org> wrote: > No, you switch off to another crop that is efficient. > > Rick >