BURLINGTON, IA - OCTOBER 22:  Rick Wirt harvests corn on October 22, 2015 near Burlington, Iowa. Wirt and his daughter Krista Kempker farm more than 2,000 acres in th area. According to the National Corn Growers Association, the overall corn crop is on track to have the 2nd highest average yield on record    (Photo by Scott Olson/Getty Images)