Corn growers know the satisfaction of seeing newly emerged, uniform rows of green corn plants set against the backdrop of dark, rich soils. By contrast, it can be painful to see an uneven stand from the truck window when driving past a field.
The cause of an uneven stand could be excess crop residue in the planter row.
“Corn residue will delay and outright interrupt plant establishment, and suppress the resulting plant population,” said Andy Heggenstaller, DuPont Pioneer agronomy research manager. “Corn residue is always a management issue, and high-yield production systems increase residue levels.”
Stand establishment is more of a challenge for corn than it is for soybeans, because corn is typically planted earlier, into cooler and wetter soils. Also, soybeans can accommodate reduced emergence by adding additional pods to make up for yield that could be lost from lower plant populations. That’s why hitting optimum corn plant population levels is so important.