I remember one year seeing the land owner I was hunting at debate with his son whether they should cut there green corn and sell as silage one year since it was "to tall". We had a banner spring and early summer a couple of years ago and his corn was about eight feet tall. But we never had hardly any rain after the first of July and when his corn put on it ears they where only about 4 to 5 inches long. He said a big plant takes alot of water to keep just the plant alive, and then if the rains slack up when the ears fill out you end up with a bad crop. Said they would get more money if they cut it for silage. First I had ever heard it, but his ears did look small on such big corn.