This is just me,but if your hunting the edge of a bean field you should already know where the bucks are entering the field in the evening through your glasssing it from a distance.Since it is buck only and your hunting a predominatly evening feeding area I would wait and hunt the evening hunt and catch one of those bucks coming to feed before you educate them to your presence. The best time to kill a buck in a situation like yours is usually the first time you hunt that set,just make sure the wind is not blowing your scent back into where you expect the bucks to enter the field. Good luck!