What if the next 10-bushel bump on your corn ground doesn’t come from a new product or technology but from how deep you set the planter and where you placed nitrogen? Dan Quinn, Purdue University corn specialist, says the biggest yield gains still come from decisions that sound simple on paper and are hard to execute in the field.
For Quinn, a winning season hinges on four pillars: plant deep enough for consistent moisture, protect uniform emergence and roots, respect nutrient interactions, and use technology and timing to manage risk — not to shortcut agronomy.
“Fundamentals are fundamentals for a reason,” Quinn says. “If something’s off… you’re not going to get any benefit from some of those more progressive practices.”
Here are the four recommendations he offers growers to get a strong start this season:
1. Consider Moisture Availability, Not Just Planting Depth
A successful season begins at the planter, but Quinn warns against getting comfortable with a “standard” depth. He argues that corn should be placed where moisture access is reliable, even if that means pushing seeds deeper than your traditional comfort zone.
“I’d rather be a bit on the deeper side than the shallow side,” Quinn says. “We’ve done some seed depth work showing corn can get out of the ground at 4 inches deep.”
While his typical target is a 2-inch depth, he advises growers to move deeper in dry conditions. The primary goal, he advises, is to ensure every seed sits in the same soil and moisture conditions to trigger uniform germination.
To complete the imbibition (water uptake) phase of germination, corn needs to absorb 35% of its weight in moisture, according to University of Nebraska Extension research. When adequate soil moisture is available, this typically occurs within 48 hours.
2. Protect Uniform Emergence And Early Root Growth
Quinn calls corn “a pain” because it offers little to no forgiveness when emergence is uneven.
“We have to get it out of the ground at the same time,” he says. “It has to be uniform, it has to get out of the ground quickly, and it has to get that root system established and moving.”
When a field looks off, Quinn said that nine times out of 10, the problem can be identified below the surface. Issues like fertilizer salt injury, compaction, or heat desiccation in sandy soils often start early but don’t manifest visually until weeks later.
“We see more often than not that if you have problems… a lot of times you can point back to that root system,” he says.
3. Master The N:S Ratio And Starter ROI
As yield targets climb, the conversation is shifting from “how much nitrogen” to “how does nitrogen interact with other nutrients.”
Quinn is specifically watching the relationship between nitrogen (N) and sulfur (S).
“Nitrogen and sulfur behave very similarly in the plant. They’re kind of joined at the hip,” he says.
Purdue research shows that high nitrogen rates can actually induce sulfur deficiency by throwing off the plant’s internal balance. As you push N rates and yield potential up, the crop’s sulfur demand also increases. If S isn’t increased proportionally, sulfur can become a limiting nutrient in the system. Quinn currently recommends 15 to 25 pounds of sulfur per acre, though he believes that might be a bit low in a high-yield system.
Additionally, Quinn remains a staunch advocate for starter fertilizer. Beyond the agronomic “safety net” it provides as corn transitions off seed reserves, he points to a secondary economic benefit: lower grain moisture at harvest.
“I’ve seen trials where just the drying savings from starter is enough to pay for the system, even beyond the yield benefit,” he says.
4. Use Tech As A Guardrail, Not A Crutch
While Quinn supports the use of variable-rate planting and advanced sensors, he views them as tools to manage risk rather than replacements for boots-on-the-ground agronomy.
He highlights hydraulic independent downforce as a game-changer for maintaining consistency in variable soils. However, he notes that even the best technology cannot fix a poor timing decision. In Indiana, this has led to increased reliance on sidedress nitrogen to limit exposure to unpredictable spring weather.
“It helps reduce some of the risk and vulnerability,” Quinn says. “It’s about making sure we do what we can to maintain having that nutrient available for the plant when it needs it most.”
Hear more of Quinn’s insights and recommendations on this episode of A Penney For Your Thoughts Podcast
