C: Bob Nielsen, Purdue Be mindful of the relationship corn populations have with end-of-season yields before making drastic changes. Farm Journal Field Agronomist Ken Ferrie tests high versus low population corn and last year found compelling evidence for higher populations. “There were 88 hybrids that went through the shellers, 880 different sets of 10 ears a piece,” Ferrie said in his “Boot in the Field” podcast. “The average of all of them was 271 bu., which is pretty strong. The average of the high population was 300—299.8 and the average of the low population was 241.” In his testing, he found it took 8,000 more kernels per acre to make an additional bushel. When you look at ear size, in lower populations you’ll see about five additional kernels in length. Check out not only the interaction planting population has with final yield, but also the impact of row spacing in Ferrie’s podcast below.