Better Yields Begin with Warm Soil Planting

Apr 28, 2026
By Farms.com

Soil temperature plays a major role in early crop emergence and vigor

According to the research led by Dr. Dennis Egli, Professor Emeritus at the University of Kentucky, uniform crop emergence is an important goal for farmers during planting season. When seeds emerge at the same time and grow evenly, crops can use sunlight, nutrients, and moisture more efficiently.

However, planting too early into cool soil can delay emergence and reduce stand uniformity, especially corn and soybeans.

Studies on crop growth show that soil temperature is one of the most critical factors affecting early seedling development. When soil is warm and moisture is adequate, seeds germinate quickly and seedlings emerge within a short period. This results in strong and uniform stands. In contrast, cool soil slows the germination process and spreads emergence over several days, leading to uneven crop growth.

Corn responds strongly to soil temperature. In warm soil conditions, corn seedlings emerge rapidly and grow at a similar pace. When planted into cooler soil, emergence is delayed and some plants appear much later than others.

These late-emerging plants often struggle to compete for light and nutrients, which can reduce ear development and lower overall yield. Corn plants that emerge early cannot fully make up for the loss caused by weaker neighbors.

Soybeans also show delayed emergence in cool soil, but they are more flexible than corn. Even when emergence is uneven, soybean plants can adjust by producing additional branches, pods, and seeds.

This ability helps protect yield, although extremely poor conditions can still reduce performance. Planting depth can further influence soybean emergence, with deeper seeds taking longer to reach the soil surface.

The key lesson for growers is that planting decisions should consider soil temperature as well as calendar dates. While early planting may provide benefits, planting into soil that is too cold increases risk. Waiting for favorable soil temperatures supports faster emergence, better uniformity, and healthier early growth.

Photo Credit: gettyimages-casarsaguru

Video: Why Invest in Canada’s Seed Future? | On The Brink: Episode 3

Darcy Unger just invested millions to build a brand-new seed plant on his farm in Stonewall, Manitoba so when it’s time for his sons to take over, they have the tools they need to succeed.

Right now, 95% of the genetics they’ll be growing come from Canadian plant breeders.

That number matters.

When fusarium hit Western Canada in the late 90s, it was Canadian breeders who responded, because they understood Canadian conditions. That ability to react quickly to what’s happening on Canadian farms is exactly what’s at risk when breeding programs lose funding.

For farmers like Darcy, who have made generational investments based on the assumption that better genetics will keep coming, the stakes are direct and personal.

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What direction will we choose?

On The Brink is a year-long video series traveling across Canada to meet the researchers, breeders, farmers, seed companies, and policymakers shaping the future of Canadian plant breeding. Each week, a new story. Each story, a piece of the bigger picture.

Episode 3 is above. Follow Seed World Canada to catch every episode, and tell us: Do you think the next generation will have the tools they need to success when they takeover? How is the future going to look?