From the Field: Choosing Wheat for Organic Systems

By Bob Whitney

On Thursday, November 13th, Dr. Brandon Gerrish, State Extension Small Grain Specialist planted our first Texas Organic Wheat Variety Trial at Todd Vranac’s certified organic farm in Rule, Texas. This test is an opportunity to evaluate wheat lines under authentic organic production conditions. This irrigated farm, managed organically over many seasons, offers an environment that conventional research plots often cannot replicate.

Each variety in the trial allows us to observe how wheat responds when relying on soil biology for nutrient cycling, competing with weeds without herbicides, and performing under the constraints of organic fertility sources. As organic wheat acreage expands in Texas, field-based evaluations like this are essential for identifying varieties that align with the agronomic realities of organic systems and for improving the recommendations available to growers.

Why Organic Variety Testing Isn’t Optional

One of the most important conversations I’ve had this year was with Dr. Jackie Rudd, Dr. Gerrish and the TAMU wheat breeding team this past August at the Small Grain Breeding Group meeting. We talked about the gap that still exists between conventional breeding and organic production, and why organic growers need data generated in organic fields.

The traits that matter most in organic systems differ from what many conventional trials measure. Organic producers need wheat that can do things like:

1. Emerge from deeper planting depths

Organic growers often plant deeper to reach moisture and to make mechanical weed control possible. With deeper rooting we can use rotary hoes or tine weeders to take our early season weeds and start cleaner. But many modern semi-dwarfs simply don’t have the coleoptile length to handle that depth. Lines with longer coleoptiles or alternative dwarfing genes (like Rht8) stand a better chance of thriving in these conditions.

2. Fight disease with genetics, not chemistry

Stripe rust, leaf rust, stem rust, Fusarium head blight, BYDV—these aren’t just occasional threats in organic wheat. Without fungicides, genetic resistance to disease becomes the primary protection for diseases. Multi-gene and adult-plant resistance are particularly valuable.

3. Use nutrients efficiently through the soil microbiome

Organic wheat depends on soil biology to help acquire nutrients. Varieties with strong root systems, mycorrhizal associations, and efficient nutrient uptake consistently do better in slow-release, biological systems. Traits like enhanced nitrate transporter activity or strong remobilization of nutrients during grain fill make a visible difference in yield.