Fig. 1. Average grain yield response of corn (relative yield, 0 to 100%) to plant populations at harvest (plants per acre), based on the aggregated results of 67 field scale trials conducted across Indiana from 2008 to 2016 that represented a normal range of growing conditions (minimal to moderate stress). The agronomic optimum population (AOPP) for this group of trials was 31,600 plants per acre at harvest with an average yield of 196 bushels per acre.