According to a survey released Friday by the Department of Agriculture, after more than 150 years on top, farming is no longer the number-one use for tractors in the U.S., surpassed by tractor-pull competitions. 'Fortunately for tractor manufacturers like John Deere,' said Agriculture Secretary Dan Glickman, 'Americans declining interest in farm-based crop-tilling has been offset by a rising interest in stadium-based ass-kicking.' 