Stine^® HP Corn^®: 10 lines for 2027, backed by three decades of high-population research

FOR IMMEDIATE RELEASE — ADEL, Iowa (Aug. 26, 2026) — Stine^® Seed Company is bringing growers 10 HP Corn^® options for 2027, including two new lines, extending a high-population breeding program the company has led for more than three decades.

Stine HP Corn is the company’s high-population corn program, built around genetics bred and selected to perform when growers tighten spacing and add plants per acre. Crowding is where a corn plant reveals its weaknesses in standability, leaf structure, pollination and ear placement. Since the 1990s, Stine has advanced only the material holding up under those conditions, producing lines that tend to have shorter plant height, strong stalks and plant architecture suited to tighter spacing.

“We didn’t set out to make corn shorter. We set out to build the highest-yielding corn we could find, and this is where the genetics took us,” says Myron Stine, company president. “Every generation we advanced got selected in high populations, where a weak plant shows itself fast. What’s in the bag today is the material that kept making grain every time we crowded it.”

Two new HP lines for 2027

Stine E481-G brand corn is a new version of the widely sold MX481-G brand corn, delivering an additional 4% yield increase along with improved standability. The 97- to 99-day, glyphosate-tolerant line has demonstrated consistent success west to east, performs best at higher planting populations and carries a premium seed treatment. E481-G led Stine’s Mid Elite Yield Trials at over 111%.

Stine E530-0 brand corn is a high-yielding conventional line with excellent moderately tall ear placement that performed at 113% in Stine’s Early-Mid Elite Trials, a separate trial group covering earlier maturities. Its semi-fixed ear allows for increased populations and maximum yield potential, and it features premium seed protection for fast starts and outstanding early-season growth.

Including E481-G and E530-0, the 2027 Stine corn lineup features 10 HP Corn options: 9105-10, 9213-G, 9322-10, 9453-G, 9756-G, 9808E-0, 9808E-G and 9808E-20. Maturities run from 83–85 days to 114–116 days, so growers on short-season northern acres and full-season southern acres alike have an HP Corn option in their zone. All 10 maintain the ear height Stine targets for harvestability.

Built for the populations growers are moving toward

Stine research shows growers can increase populations by up to 12% with HP Corn, and a potential 10% yield boost at higher plant populations when the genetics hold performance under greater density. 

Population is only part of the equation. Narrowing row width moves plants toward the more equal-distance plant spacing that lets a dense stand perform. The goal on fertility is making sure nutrients are available when the plant needs them most, including sulfur in the fertility program. Those practices pay off when the genetics underneath them hold standability and ear quality in a crowded stand.

“Growers ask how far they can push populations without giving up standability or ear quality,” says Brian Hartman, Stine national corn product manager. “That’s the question our program has been answering since the 1990s. We aren’t guessing at what happens when a grower adds plants. We’ve been planting and selecting at those populations for three decades, so a grower can move up and know the genetics have already been through it.”

Plant architecture built for dense stands

HP Corn architecture addresses the challenges of higher plant populations.

More upright leaf structure keeps neighboring plants from shading one another in a dense canopy, so the stand captures sunlight it would otherwise lose. Smaller tassels cast less shade on the leaves below them, and a shorter distance between the tassel and the uppermost ear supports more efficient pollination.

Sturdier stalks and a lower center of gravity hold plants up through wind events, when a crowded stand is most vulnerable. Ear placement has moved up the plant relative to plant height across generations of selection, keeping ear height favorable for excellent harvestability.

Shorter plants also open up management options. Where field conditions and equipment allow, growers can make fungicide and fertilizer applications with ground equipment rather than by air.

Proven in the Elite Yield Trials

Every HP Corn line moves through Stine’s Elite Yield Trials before reaching a grower’s field. E481-G led its Mid Elite Yield Trials group at over 111%, and E530-0 performed at 113% in the Early-Mid Elite Trials.

“These have been tested in real fields, at the populations growers actually plant, generation after generation,” says Hartman. “That’s the difference between a concept and a product growers can plant with confidence.”

The breeding program behind the 2027 HP Corn lineup is the same one Agri Marketing magazine recognized with its 2023 Product of the Year award, an honor whose past recipients include Roundup Ready technology and Bt-traited corn.

Explore Stine’s full 2027 corn lineup in the Stine Corn and Soybean Product Guide on StineSeed.com. Farmers can also contact their local Stine sales rep for more details on HP Corn options for next season.