 and 2023 trials showed a 14-bushel increase in corn. Reduce stresses and shield your yield with Heat Shield from Hefty Naturals. The granddaddy of them all is happening tonight at the Polk County Fair in Fertile, Minnesota. It's super demo derby action in front of the grandstand starting at 6.30 p.m. Enjoy the last day with the midway opening at noon, plus the parade and best fair food around.