Two acres of corn treated with a Bacillus consortium and reduced NPK, set against adjacent control acres on standard fertiliser alone. 16S rRNA sequencing found the treated ground carrying a materially different microbial community, with nitrogen cycling running several times faster.
Headline outcomes
Ammonia oxidisers rose 133% and nitrite oxidisers 786% in the treated soil. Both steps of nitrification were running harder, which is what converts applied and mineralised nitrogen into a form the crop can take up. This is the finding the rest of the trial rests on.
Filamentous bacteria rose 179%. These build aggregate structure and improve water retention. The population needs monitoring across seasons, but the direction is the one you want in a Texas summer.
Opportunistic pathogens appear roughly halved. Control soil carried Streptococcus and Staphylococcus among its enriched genera; treated soil did not.
Enrichment of Microvirga and Bacillus points to a biofertiliser effect worth 20–30% off fertiliser cost and 5–15% on yield through better nutrient management. These are projections from the microbial data, not measured harvest figures.
Executive summary
RAD Microbes ran a comparative field trial to assess what its microbial consortium does to corn ground. Two acres received the consortium plus NPK fertiliser at below standard rates. Adjacent control acres received standard NPK alone, with no microbes.
Soil samples analysed by 16S rRNA sequencing showed distinct microbial shifts in the treated soil, with improved nutrient cycling, functional diversity and resilience traits. The treated ground carried higher levels of the bacteria that handle nitrogen and phosphorus, which is the mechanism behind reduced dependence on synthetic fertiliser and the environmental case that follows from it.
These findings support the company's work on bioinoculants for regenerative farming, and they were produced under real conditions on a real field rather than in a controlled environment.
Background
RAD Microbes works on microbial solutions for regenerative agriculture, with an emphasis on bioinoculants that improve soil health, plant resilience and bioremediation while cutting synthetic chemical use.
This trial sits inside the company's research and development work, validating a Bacillus-based liquid culture consortium built on Bacillus licheniformis, Bacillus megaterium and Bacillus subtilis. Those strains were chosen for their ability to solubilise phosphates, break down organic matter and stimulate plant growth. The question the trial set out to answer was whether combining them with reduced fertiliser input would strengthen the soil microbial community enough to support efficient corn production in the field.
Methodology
Location and design
Corn fields in Prosper, Texas. Two acres were designated the treatment area and received the microbial consortium plus NPK applied at planting below standard rates. Adjacent control acres received only standard NPK per acre, with no microbes.
Application
The consortium was applied as a liquid inoculum during planting. Dosage and timing followed standard agricultural protocols so the application stayed compatible with corn growth stages.
Sampling and analysis
Soil samples were collected after treatment application and analysed by Environmental Genomics, covering bacterial taxa at 0.1% relative abundance or above. Functional traits, such as ammonia oxidation or phosphate accumulation, were inferred from established microbial databases.
The consortium
The consortium is built so that the strains cover distinct functions rather than duplicating each other: enzyme production, mineral solubilisation, pathogen suppression, and the breakdown of chemistry the ground has already been exposed to.
Produces extracellular enzymes that degrade complex organic compounds, improving nutrient availability and soil fertility. This strengthens root systems and reduces reliance on chemical fertiliser.
Solubilises phosphate and trace minerals while producing extracellular polysaccharides that promote root colonisation and nutrient uptake. It supports plant development, higher yields and resilience in nutrient-deficient soils.
Secretes subtilisin enzymes and biosurfactants that suppress pathogenic fungi and bacteria, while improving soil structure and water infiltration through organic matter degradation. That dual role reduces pesticide need and builds natural soil resilience.
Degrade recalcitrant pesticides and herbicides, supporting soil remediation and contaminant removal. These species restore soil health in chemically impacted ground, which is what makes low-residue agriculture possible on land with a history.
Degrades persistent pesticides and herbicides through ligninolytic enzymes. This detoxifies contaminated soils and aids ecosystem recovery, making the crop that follows a safer one.
Results
The sequencing data showed clear differences in microbial composition between the microbe-treated and fertiliser-only soils. Figures below are relative frequency percentages.
| Trait | Microbe-treated | Fertiliser-only | Notable difference |
|---|---|---|---|
| Ammonia oxidisers | 133% higher, treatedImproves nitrogen transformation. | ||
| Nitrite oxidisers | 786% higher, treatedEnhances the nitrification process. | ||
| Nitrite reducers | Slightly higher, controlIndicates denitrification potential. | ||
| Phosphate accumulators | Higher, treatedBoosts phosphorus availability. | ||
| Glycogen accumulators | Treated soil onlyAids biological phosphorus removal. | ||
| Filamentous bacteria | 179% higher, treatedSupports soil structure, needs monitoring. | ||
| Methylotrophs | Slightly higher, controlAids carbon cycling. |
Bars are scaled against the highest single value in the table, 8.21% for nitrite reducers in the control soil, so the small traits read correctly against each other rather than each filling its own row.
Results
Microbe-treated
No single genus runs away with the population. That spread is the balanced, diverse community the consortium is meant to build.
Fertiliser-only
A more uniform profile, with Ramlibacter and Altererythrobacter dominant. That pattern may signal nutrient imbalance and carries a longer-term risk of degradation.
Enriched, microbe-treated
Microvirga, Rubrobacter, Microlunatus, Gaiella, Tetrasphaera (phosphate accumulator), Nitrospira (nitrite oxidiser), Azospirillum, Defluviicoccus (glycogen accumulator).
These drive nutrient cycling and plant growth. Nitrospira in particular is the organism behind the 786% nitrite oxidiser figure.
Enriched, fertiliser-only
Aquicella, Novosphingobium, Mucilaginibacter, Sphingobium, Streptococcus, Staphylococcus.
A heavier heterotroph load, and the presence of Streptococcus and Staphylococcus is what sits behind the opportunistic pathogen reading.
Discussion
The consortium fosters a balanced, diverse community in the treated soil, against a more uniform profile in the control. The dramatic increases in nitrite oxidisers at 786% and ammonia oxidisers at 133% are the significant part: both raise nitrogen efficiency, which is what supports the projected 20–30% reduction in fertiliser need.
The 179% rise in filamentous bacteria supports better soil aggregation and water retention. The roughly 50% reduction in opportunistic pathogens points to better crop protection. Enriched genera such as Microvirga, which fixes nitrogen, and Bacillus, which solubilises phosphate, imply a biofertiliser effect leading to cost savings and yield gains of 5–15%.
In the control soil, dominance by Ramlibacter and Altererythrobacter may signal nutrient imbalance, which raises the long-term risk of degradation and the cost of farming that ground.
For a grower, the argument is three things. Land regenerates through organic matter buildup. Input cost falls. Profitability improves because the crop is more resilient. The trial is not an argument for abandoning fertiliser, it is evidence that microbes work as a complement to it.
Conclusions
The trial confirms that the RAD Microbes consortium, integrated with reduced NPK, enhances soil microbial health and nutrient dynamics in corn ground. The changes suggest practical benefits in fertiliser savings, yield and environmental sustainability.
The results are preliminary. They come from one season, two acres and a single sampling date. What they establish is that the mechanism is real and measurable in the field, which is the point a trial of this size is meant to settle before a larger one is committed to.
What happens next
We are scaling from two acres to fifty, testing varying microbial doses against different NPK levels to find where the input reduction stops paying.
We are tracking yield, soil nutrients and microbial stability across multiple seasons, which is the only way to know whether the filamentous population and the pathogen reduction hold.
References and analysis
