Are you sure you are scent free? Are you facing downwind or have a crosswind?? Like its been said already, could be alot of different things as to why you arent seeing anything yet. I would definetly set up on the edge of the CRP field with a cross wind if possible and give yourself a better opportunity to see if they are coming from a greater distance. It seems like you are hunting in the woods from what you described in your last post. That can make it difficult to see them coming in until they are right on top of you, but if you are making movement, they could be spotting you first and turning away. Just a thought.