A simple question from a farmer about planter seed plates recently sparked an unexpected lesson on the importance of good soybean singulation. Two of the nation’s best-known yield champions urged growers to rethink how they meter soybean seed — and how many plants they actually need in the field.
During a Breaking Barriers with R&D segment, Virginia farmer David Hula and Georgia grower Randy Dowdy explained that the path to a more uniform, productive soybean stand begins with precision singulation.
For decades, the standard rule of thumb was that singulation — the mechanical precision of a planter dropping one seed at a time to achieve even spacing — only truly mattered for corn. Soybeans are famous for their plasticity; they are highly adaptable. If a gap opens up in a row, neighboring soybean plants will usually branch out to fill the void.
However, as farmers have started lower seeding populations to cut input costs and take advantage of improved genetics, crop experts and multi-year field studies are uncovering the clear benefits of “picket-fence” soybean stands. Dowdy, Hula and other agronomic experts point to four distinct ways precise singulation actively boosts a soybean crop:
1. Driving High-Yield Branching
Singulation comes down to whether the seed meter cleanly pulls one seed at a time off the disc before releasing it into the seed tube. If soybeans are poorly singulated, the result is typically a pattern of “clumps and gaps.”
When two or three seeds drop right on top of each other, the result is often thin, single-stemmed plants that fight for sunlight and nutrients. Proper singulation gives every plant its own bubble of space. Data from agronomy trials, including Beck’s Hybrids PFR (Practical Farm Research) and Pioneer Seeds, shows that individual soybean plants with room to breathe develop much more pronounced lateral branching — where a significant portion of the plant’s yield potential lives.
2. Improving Seed/Plant Survival Rates
Iowa State University (ISU) Extension research has found that good singulation directly improves plant survival rates. In ISU trials, precision-singulated soybean rows achieved a survival rate in plants of roughly 84%, compared to just 77% in systems that allowed crowded doubles. This demonstrates that crowded plants suffer from significantly higher early-season mortality.
3. Maximizing Low-Population Success
Soybeans do not have the same degree of correlation between plant density and yield outcome. Historically soybeans were often seeded at rates well over 200,000 seeds per acre. However, since the turn of the current century, seeding rates have steadily declined to an average of around 147,000 seeds per acre in 2022 (Corteva Agriscience Grower Survey) even as soybean yields have continued to increase.
Dowdy is a proponent of dropping seeding rates even lower. He encourages growers, especially in 30-inch rows, to consider planting even fewer soybeans per acre and trusting a cleaner stand to improve yield outcomes.
If you are planting 180,000 seeds per acre, a few skips and doubles won’t ruin your stand. But if you drop down to 125,000 seeds per acre, every single seed has to count. Precision singulation gives growers the confidence to lower their seeding rates because it helps guarantee a highly uniform crop.
4. Providing a “Yield Shield” in Stressed Environments
Recent peer-reviewed crop research indicates that plant-to-plant uniformity is particularly vital in low-to-medium yield environments. In ideal, heavily irrigated fields, soybeans can usually compensate for sloppy spacing. But when a crop encounters environmental stress—like localized drought, intense heat, or nutrient deficiencies—the plants lose their ability to stretch and make up for poor placement.
Uniformly spaced plants share resources more equally, making the entire field more resilient against severe weather swings.
The Economic Takeaway
While farmers are unlikely to see a yield plunge in poorly spaced soybeans like they might experience with corn, the data from precision agriculture studies (such as Precision Planting’s PTI farm) tells a consistent story. Achieving good singulation provides an average yield bump of 1.2 to 1.4 bushels per acre. At scale, that minor mechanical tweak translates directly to an extra $10 to $15 of net profit per acre, depending on market prices.
Listen to Dowdy and Hula’s discussion on seed singulation and more with Chip Flory, host of AgriTalk, at the link below:
