What would be some options for a cover crop after I take my oats off.  We are in northwest lower michigan and will have our oats done in a week to 10 days.  I plan on putting corn on after oats.  Im not sure I have enough time for clover to work.  Will a tillage radish be an option or some of the cover crop mixes I see work.  This will be on very sandy low organic matter ground with a fair amount of weed pressure.  Most of this was pasture with little weed control over the past 10 yrs or so.  Also what do I neep to do to prep ground.  I have a 5100 ih drill with a seeder.

thanks.