STATE -- The value of an acre of Shelby County farmland jumped 30 percent, mirroring counties statewide that saw similar increases, according to the annual farmland value survey presented by Iowa State University last week. Shelby County saw its value increase to $10,237 from the year before’s $7,878. In west central Iowa, Monona County saw the highest per acre increase at 32.9 percent, while Pottawattamie County saw the lowest but sti