Fig. 2. Optimum plant population versus grain yield at the optimum population for each of 67 field scale trials across Indiana from 2008 to 2016 that represented a normal range of growing conditions (minimal to moderate stress). The average optimum PLANT population was 31,600 ppa and 68% of the individual trial optimum PLANT populations were between 26,000 and 34,000 ppa (between the dark lines on the graph).