BNI Wheat: Can the Crop Help Manage Its Own Nitrogen?

Nitrogen is one of the most important nutrients in crop production, but it is also one of the hardest to manage well. In organic agriculture, that challenge is even greater because we do not use synthetic nitrogen fertilizers. We depend on legumes, manure, compost, crop rotations, soil organic matter, and biological activity to supply nitrogen over time.

That makes nitrogen efficiency extremely important. Every pound of nitrogen released from manure, compost, legumes, or soil organic matter needs to be captured by the crop as effectively as possible. When nitrogen is lost, the farmer may lose yield potential, grain protein, forage value, and money. The environment can also lose because nitrogen may move into water or escape from the soil as nitrogen gases. This is why a concept called Biological Nitrification Inhibition, or BNI, has great potential and why we are looking at it in our wheat breeding programs.

What Is BNI?

BNI is a natural plant trait where roots release compounds that slow down nitrification, the microbial process that converts ammonium nitrogen into nitrate nitrogen.

That matters because ammonium nitrogen, written as NH₄⁺, tends to stay attached to soil particles. Nitrate nitrogen, written as NO₃⁻, is much more mobile and can move with water below the root zone. Nitrate can also be involved in soil processes that produce nitrous oxide, a greenhouse gas.

In simple terms, BNI may help the crop slow the leak in the nitrogen bucket.

BNI does not stop nitrogen cycling. It does not sterilize the soil. It simply slows one part of the nitrogen cycle near the root so more nitrogen may remain available to the crop longer. Researchers describe BNI as root exudates suppressing ammonia-oxidizing bacteria and archaea, which are microbes involved in the first major step of nitrification (Coskun et al., 2017; Subbarao et al., 2013; Subbarao et al., 2021).

Why This Matters in Organic Farming

Organic farmers already work hard to build nitrogen through biology. Legume cover crops, compost, manure, crop residues, and soil organic matter all release nitrogen through natural processes. The challenge is timing. The crop needs nitrogen at certain growth stages, but the soil releases nitrogen according to moisture, temperature, microbial activity, and residue quality.

If nitrogen becomes nitrate too early, it may be lost before the crop can use it. BNI wheat may help by keeping more nitrogen in the ammonium form near the root system.

That does not replace good organic management. BNI wheat would still need good rotations, fertility planning, soil health, weed control, and adapted varieties. But if the crop can help hold nitrogen in the root zone longer, it may improve nitrogen-use efficiency in systems where nitrogen is often expensive, limited, or difficult to time correctly.

Why Wheat?

Wheat is one of the most flexible crops in American agriculture. It can be harvested for grain, cut for silage, grazed as forage, used in dual-purpose systems, or grown as a cover crop. That makes wheat especially important in organic systems. In Texas, wheat is often part of livestock systems and row-crop rotations. For organic dairy, beef, grain, and cover crop systems, a more nitrogen-efficient wheat could have value across the whole farm.

Is BNI Wheat Genetically Engineered?

No! The BNI wheat being discussed in current research is developed through conventional plant breeding methods, not genetic engineering. Researchers identified a strong BNI capacity in a wild relative of wheat called Leymus racemosus. The BNI-associated chromosome segment from that wild relative was transferred into wheat, and researchers have since developed BNI-enabled wheat lines such as MUNAL-BNI and ROELFS-BNI (Subbarao et al., 2021; Bozal-Leorri et al., 2022).

This work uses crossing, backcrossing, marker-assisted selection, root exudate testing, and field evaluation. These are conventional breeding tools, even though some are advanced. Marker-assisted selection simply helps breeders identify which plants inherited the desired chromosome segment. It does not create a genetically engineered plant. That distinction matters for organic agriculture because BNI wheat fits within the conventional plant breeding pathway.

What Do We Know So Far?

The science is still developing, but the early evidence is encouraging. Research has shown that BNI capacity exists in wild relatives of wheat and in some wheat landraces. One study found significant BNI activity in several wheat landraces, showing that BNI is not limited only to wild species (O’Sullivan et al., 2016). More recent work shows that wheat genotypes vary in root exudate chemistry and BNI activity, which means breeders may have useful natural variation to work with (Ghatak et al., 2025).

Studies with BNI-enabled wheat lines have reported reduced ammonia-oxidizing bacteria, lower nitrification potential, lower nitrate levels, greater ammonium retention, improved nitrogen uptake, and no yield penalty in many cases (Subbarao et al., 2021; Bozal-Leorri et al., 2022; Karwat et al., 2025).

That does not mean every question is answered. Soil type, pH, temperature, nitrogen source, crop stage, and variety background can all affect how well BNI works. But the evidence is strong enough to justify serious breeding, field testing, and organic systems research.

What Could BNI Wheat Mean for Farmers?

For organic grain farmers, better nitrogen-use efficiency could help with both yield and grain protein. Protein is especially important in bread wheat markets, and nitrogen availability is one of the major drivers of protein.

For organic dairy and livestock producers, BNI wheat could have value as forage, silage, grazing, or feed grain. If wheat can use nitrogen more efficiently, it may improve the economics of growing organic feed locally.

For organic crop rotations, BNI wheat could become another tool to help stabilize fertility. It will not replace legumes, compost, manure, or cover crops, but it may help the crop use those biological nitrogen sources more efficiently.

For the environment, BNI wheat may reduce nitrate leaching and nitrous oxide emissions. Reviews of BNI research suggest that BNI crops can improve nitrogen-use efficiency and reduce nitrogen losses, although field performance will depend on soil, climate, crop genetics, and management (Coskun et al., 2017; Subbarao et al., 2013; Saud et al., 2022; Wang et al., 2021).

References

Bozal-Leorri, A., Subbarao, G., Kishii, M., Urmeneta, L., Kommerell, V., Karwat, H., Braun, H., Aparicio-Tejo, P., Ortiz-Monasterio, I., González-Murua, C., & González-Moro, M. (2022). Biological nitrification inhibitor-trait enhances nitrogen uptake by suppressing nitrifier activity and improves ammonium assimilation in two elite wheat varieties. Frontiers in Plant Science, 13. https://doi.org/10.3389/fpls.2022.1034219

Coskun, D., Britto, D., Shi, W., & Kronzucker, H. (2017). Nitrogen transformations in modern agriculture and the role of biological nitrification inhibition. Nature Plants, 3. https://doi.org/10.1038/nplants.2017.74

Ghatak, A., et al. (2025). Natural variation of the wheat root exudate metabolome and its influence on biological nitrification inhibition activity. Plant Biotechnology Journal, 23, 4755–4772. https://doi.org/10.1111/pbi.70248

Karwat, H., et al. (2025). Nitrogen dynamics and yield performance of an elite bread wheat line with BNI capacity expressed in an alkaline soil. bioRxiv. https://doi.org/10.1101/2025.07.29.667244

O’Sullivan, C., Fillery, I., Roper, M., & Richards, R. (2016). Identification of several wheat landraces with biological nitrification inhibition capacity. Plant and Soil, 404, 61–74. https://doi.org/10.1007/s11104-016-2822-4

Subbarao, G. V., et al. (2021). Enlisting wild grass genes to combat nitrification in wheat farming: A nature-based solution. Proceedings of the National Academy of Sciences, 118. https://doi.org/10.1073/pnas.2106595118

Subbarao, G. V., et al. (2013). A paradigm shift towards low-nitrifying production systems: The role of biological nitrification inhibition (BNI). Annals of Botany, 112(2), 297–316. https://doi.org/10.1093/aob/mcs230

Wang, X., et al. (2021). Effects of biological nitrification inhibitors on nitrogen use efficiency and greenhouse gas emissions in agricultural soils: A review. Ecotoxicology and Environmental Safety, 220, 112338. https://doi.org/10.1016/j.ecoenv.2021.112338

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Flame Weeding, Soil Biology, and Organic Farming: Questions Worth Asking

One of the interesting things about organic agriculture is that it constantly forces us to balance competing biological, ecological, and practical realities. Recently, I posted a short video showing a farmer using a propane flame weeder to suppress field bindweed, and it generated a spirited discussion about soil biology, climate impacts, and whether flame weeding even belongs in organic systems.1

Rather than turning that discussion into “who won the argument,” I think it raises some important questions that many farmers, gardeners, and consumers are already asking.

Field bindweed itself is a good example of why these conversations matter. Field bindweed is one of the most difficult perennial weeds in organic farming. It spreads aggressively through deep underground roots and rhizomes, and tillage can actually make infestations worse by cutting and moving living root fragments throughout the field.

Can flame weeding fit within a biologically minded organic system? Does flame weeding sterilize the soil?

This is probably the biggest concern people have when they first see flame weeding. The answer is no — not in the way many imagine.

Flame weeding is a very shallow, fast exposure of heat. The objective is usually not to incinerate the plant but to rupture plant cells in the foliage. Most flame weeding systems move rapidly across the soil surface, and soil itself is actually a very effective insulator.

Research has shown that the heat impact declines dramatically within just a few millimeters of soil depth. Surface microorganisms may certainly be affected, especially some bacteria very near the soil surface, but the overwhelming majority of the soil microbial ecosystem remains protected below that thin layer.2

That distinction matters because soil microbial communities are not static. Bacterial populations can rebound extremely quickly under favorable conditions. Fungi, spores, protected aggregates, organic matter, and deeper microbial habitats often remain largely intact.

A useful comparison is prescribed burning in rangelands and forests. Fire can temporarily suppress some organisms near the surface while simultaneously stimulating nutrient cycling, changing plant competition, reducing excess residue, and shifting ecological balance. The outcome depends heavily on intensity, duration, frequency, and what happens afterward.

Why would an organic farmer use flame weeding at all?

Texas A&M AgriLife weed research just got the new Red Dragon Engineering flaming attachment setup to allow for burndown as well as in-row applications. Hopefully, this will be another useful tool in the toolbox. The “weed team” will be testing it in organic cotton and sorghum this summer.

Organic farming is not simply “avoiding chemicals.” It is a management system focused on biological function, long-term productivity, and ecological balance. But organic farmers still have to manage weeds. Perennial weeds create especially difficult problems because many standard control methods can worsen the issue. With bindweed, repeated tillage often spreads the infestation. Herbicides are not available in certified organic systems. Hand labor is expensive and often impractical at field scale. In the case from the video, the farmer was not trying to permanently kill bindweed with a single flame pass. That would be unrealistic but instead, the goal was suppression.

The farmer was temporarily weakening the bindweed canopy until soil temperatures became warm enough to plant a highly competitive sorghum forage crop. Sorghum can become an extremely aggressive shading crop that competes strongly against bindweed while simultaneously contributing large amounts of root biomass and crop residue back into the soil.

Why do grasses like sorghum often stimulate bacterial activity?

Grass crops such as sorghum, corn, wheat, and other cereals typically produce extensive fibrous root systems. Those roots release large amounts of carbon compounds — called root exudates — into the rhizosphere, which is the narrow zone of soil surrounding roots. These exudates feed bacteria and other microorganisms.

Many soil biology tests, including PLFA (phospholipid fatty acid analysis) and Haney soil testing approaches, often show strong bacterial responses following vigorous grass growth. That does not mean fungi are unimportant. In fact, healthy soils need both fungal and bacterial communities. But grasses frequently shift the system toward greater bacterial dominance compared to some perennial or woody systems. The important point is that soil biology is dynamic. A single management event does not define the entire biological trajectory of a field.

What about climate concerns from propane?

That is also a fair question. Propane is a fossil fuel. There is no reason to pretend otherwise. But agricultural systems are rarely evaluated honestly if we isolate one input without comparing alternatives.

The comparison is not “flame weeding versus doing nothing.” The comparison is usually:

• repeated tillage passes,
• additional tractor operations,
• cultivation,
• soil disturbance,
• diesel fuel use,
• erosion risk,
• moisture loss,
• or long-term perennial weed spread.

In some situations, a targeted flame treatment may actually reduce total disturbance compared to aggressive tillage programs. Organic agriculture often involves choosing between imperfect tools while trying to move the system toward better long-term outcomes.

Can flame weeding be overused?

Absolutely! If someone used intense flame applications repeatedly with no larger biological or agronomic strategy, there could certainly be negative consequences. Like tillage, grazing, cover crops, fertilizers, or irrigation, the effect depends on how the tool is used. Flame weeding should generally be viewed as a targeted management tool, not the foundation of the farming system.

A biologically focused farmer should still prioritize:

• living roots,
• residue cover,
• diverse rotations,
• microbial habitat,
• reduced disturbance,
• carbon cycling,
• and competitive crop canopies.

Organic farming is often about tradeoffs, not perfection

One challenge in discussing organic agriculture publicly is that people sometimes assume every organic practice must have zero environmental cost. Real farming does not work that way. Organic farming is a systems approach. Farmers constantly balance weed pressure, economics, soil biology, labor, fuel use, crop competition, erosion risk, and long-term field productivity.

The more useful question is usually not:
“Is this tool perfect?”

But rather:
“Does this tool move the overall system in a healthier direction over time?”

For difficult perennial weeds like bindweed, many organic farmers would argue that temporary suppression combined with competitive crops, biological improvement, and reduced tillage may be preferable to aggressive cultivation that spreads the weed even further. That does not end the discussion, but it does make the conversation more nuanced than simply saying “fire is bad for soil biology.”

References

Additional Resources

• Organic Control of Field Bindweed
• Applying Field Bindweed Gall Mites
• Update to Applying Field Bindweed Gall Mites

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#MOFGA #VirtualEvent - #SoilBiology and #SoilHealth Office Hours with Deborah Neher

May 21 @ 12:00 pm - 1:00 pm
Free, Registration Required

"As part of #MGA’s ongoing efforts to support #organic/transitioning #GrainGrowers, we are now hosting office hour sessions with experts on all sides of the regional grain economy.

"Deborah ('Deb') Neher is a soil ecologist and professor emerita at University of Vermont. She gained formal education in plant pathology, plant population ecology, and environmental science. Her experience as a researcher, educator, and graduate student mentor spans 35+ years.

This event is made possible with support from the USDA Transition to Organic Partnership Program."

FMI and to register:
https://www.mofga.org/event-calendar/soil-biology-and-soil-heath-office-hours-with-deborah-neher/

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#BrunswickME - Science for #SelfReliance: #Gardening with Responsible #PestManagement + #BeneficialHabitat

May 20, 2026
5:00 pm - 6:30 pm

#CurtisMemorialLibrary
23 Pleasant St
Brunswick, #Maine 04011

Free

"This event was originally scheduled for April 16. The date has been updated to May 20.

Join #MOFGA’s Crop Specialist, Caleb Goossen, for a discussion on #organic management of common pests in the #VegetableGarden. Caleb will start by sharing strategies used to minimize the presence of pests from the outset using cultural practices such as promoting the presence of '#beneficials'. But sometimes pests show up anyway, despite our best efforts or during particularly challenging growing seasons. So, Caleb will also discuss what can be done when pests emerge."

Source:
https://www.mofga.org/event-calendar/science-for-self-reliance-gardening-with-responsible-pest-management-beneficial-habitat/

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