Up to Their Ears in Corn - S6.E31

Luke is horrified when Uncle Rightly promotes a corn growing contest at the Grange and is so carried away he volunteers a $500 award to the winner in Grandpa and Luke's name. When Luke learns Uncle Rightly doesn't have the $500, it becomes a major problem of raising the money and saving face with the Grange members, but Rightly solves the problem in an unusual way and comes up with the prize money.