Soybean seeds

It’s seed selection season and many discount deadlines are approaching. Yield trial results are a key component when making sound seed selection decisions.

The SDSU Crop Performance Testing program releases new crop performance results each year, as do surrounding state land grant institutions. To view unbiased crop performance results from SDSU visit to browse through various lines corn, soybean, oat, wheat, field pea, barley, proso millet, sunflower and sorghum trial results.

When thinking about corn hybrids or soybean varieties, in particular, consider a few things first.

Yield data

High-yielding cultivars are typically priority number one for producers. However, there are many factors to consider when sifting through yield data.

Corn or soybean cultivars should be carefully evaluated for consistent performance in multiple locations over a few years — this reduces error for environmental conditions.

Crop maturity

Weather is tough to predict, but most growers know what maturities work best in their local environment during a “typical” year.

You can use weather trends and “growing degree-day” data to create an estimate. It is good to hedge one’s bets by planting multiple hybrids or variety maturities in an appropriate range.

Plant disease tolerance

Know your field history and plan accordingly for disease tolerance. If a particular pest is an issue on your farm, consider making changes to your field management and look for cultivars that are tolerant or resistant to the disease.

Stacked traits

Many modern hybrids and varieties offer transgenic (stacked) traits that protect crops from herbicides and insects. If resistance to particular herbicides or insecticides has developed on your farm, take special care when selecting cultivars with transgenic technology.

Emergence, vigor

Excellent emergence and plant vigor are an integral part of achieving the intended plant population. High vigor and emergence ratings help to minimize the risk of losing yield due to plant stress from plant pests and weather events.

Excellent plant emergence is very important, considering the cost of seed.


In areas where soil moisture is often high or late harvests often occur, corn lodging or standability — breakage below the ear — ratings are an important consideration. Keep in mind that higher plant populations — above 33,000 plants per acre — often cause an increase in lodging potential.

Green snap

In cornfields, depending upon growth stage and position in the landscape, green snap is a concern when wind storms arise. If green snap is a common problem in your area or wind storms are frequent, green snap ratings should be an important consideration.


Corn drydown ratings are helpful to predict an approximate ideal harvest date on your farm. Knowing the drydown rating of a corn hybrid can aid in choosing the proper grain maturity.

Seed cost

Seed costs seem to climb higher each year with the release of new and emerging technologies aiming to improve yields.

Early adoption seed discounts can be very tempting, but remember that choosing the right seed is usually more important in determining the final yield than other inputs used during the growing season.

Waiting for appropriate yield data and getting a better look at the growing season weather may make it worth losing some discount dollars to ensure you choose the best seed for your farm.

Selecting a corn hybrid or soybean variety can be an overwhelming decision, but be sure to take the time to choose the seed that is right for your farm. When looking over yield information always look for hard data to back up marketing claims. Take time to review university and private data at a wide range of locations.

Lines that consistently perform well across many different climates and environmental conditions are likely to perform well next year.

Sara Bauder is an agronomy field specialist with the South Dakota State University Mitchell Regional Center.

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