If you were to plant the outside perimeter of the food plot in turf grass it will keep the weeds choked out, Use a perennial rye and KY 31 tall fiecue, it is cheap and plant it thick enough to come up like a lawn, keep it mowed, it will serve as a food plot as well for rabbits and a few deer will graze on it some..Be careful not to hit it with weed spray if you do plant RR soybeans in the plot.......