Sed, don't want to steal your thread but also have a related question.  I have some pockets of giant rag's that I'm having trouble controlling.  Each pocket is far less than an acre.   What do you guys think about me getting the IH M and 3 bottom plow out this fall/next spring and moldboard plowing these areas?   The intent of course is to bury the seed 6 - 7" deep.