To meet the demand for food for huge cattle herds, the land area devoted to corn quickly grew, pushing out all other crops, until by the 1980s the vast farmland of Iowa had become a monotonous "maize" seemingly impossible to escape.
在大量牛群需要餵食的情況下，玉米田快速蔓延，佔據了所有耕地，終於形成 80 年代以後愛荷華州浩瀚田野一片單調的玉米田景象。