I've seen signs like these all over the place ever since I was a little girl -- I remember especially the DeKalb seed corn signs that a neighbor put up, that advertised the hybrid cross he was using. My farmer dad never put up these signs, so I am mystified - Is this like an advertisement for the variety of seed? Does the farmer get paid for advertising? Or is it just a point of pride, if his corn grows well, to let the neighbors know what he planted? Or, is it a warning, in case the corn pollen might cross-polinate with another variety?