Bacteria or Fungi… which one should a farmer focus on…
For decades, the conventional approach to farming has prioritized synthetic fertilizers, pesticides, and tillage practices that, while effective in the short term, have often come at a cost: the suppression or outright destruction of the biological life that makes soil truly function.
Today, with the rise of regenerative and biologically-focused agriculture, we’re finally starting to understand just how critical soil biology—especially the balance between fungi and bacteria—is for long-term productivity, plant health, and environmental sustainability.
What Are Fungi and Bacteria Doing in Your Soil, Anyway?
Fungi and bacteria are the foundation of the soil food web. They perform vital roles such as:
- Breaking down organic matter
- Cycling nutrients (like nitrogen, phosphorus, and sulfur)
- Protecting plant roots from pathogens
- Improving soil structure for better water and air flow
But it’s not just about having them present. It’s about having the right ratio of fungi to bacteria for your specific crop, soil type, and environment.
Why the Ratio Matters
Different crops thrive in different biological environments:
- Annual row crops (like corn, wheat, and soy) typically do better in bacteria-dominant soils.
- Perennials, trees, and native grasses often prefer fungi-dominant systems.
What we’re learning through metagenomic testing—cutting-edge technology that maps out the microbial life in your soil—is that the ratio of fungi to bacteria plays a massive role in how well your soil functions. When the ratio is out of balance, your soil isn’t working for you—it’s working against you.
Conventional Farming: A System That Held Biology Back
The old system never accounted for microbial balance. In fact, it did the opposite:
- Tillage disrupts fungal networks.
- Synthetic nitrogen fuels bacteria but suppresses fungi.
- Fungicides and pesticides, while sometimes necessary, often eliminate entire beneficial communities.
The result? A biological void. And in that void, plants become dependent on more and more synthetic inputs just to survive.
Reintroducing Balance to a Mono-Cropped System
Here’s the challenge: how do we bring diversity and biological function back into systems built around single crops and high yields?
The answer starts with data.
- Test First
Metagenomic testing gives us the biological baseline. It tells us what’s there, what’s missing, and what the fungi-to-bacteria ratio looks like in your field—not just a research plot somewhere else. - Apply with Precision
Once you know what your system needs, you can choose products from trusted biological suppliers that provide hard, scientific data about their microbial content and effects. Applying biology blindly is like applying fertilizer without a soil test—it’s wasteful at best, harmful at worst. - Monitor and Adjust
Balance isn’t a one-time fix. It’s a dynamic process that shifts with crop rotation, chemical usage, irrigation, and environmental conditions. That’s why regular testing and response-based application is the new standard.
Diversity is the Goal. Testing is the Gateway.
Mother Nature never intended soils to be dominated by one species—plant, bacteria, or fungi. Diversity in the soil microbiome leads to resilience, better nutrient cycling, and improved crop performance.
Here is a breakdown of what we see from a bacterial load in the current conventional system.
| Genus | Why It’s Dominant | Function / Impact |
| Pseudomonas | Thrives with synthetic nitrogen and moisture | Can promote plant growth, but some strains can be pathogenic |
| Bacillus | Spore-forming, survives tillage and agrochemical exposure | Some species produce antibiotics and can aid plant protection |
| Arthrobacter | Highly adaptable, survives in disturbed or harsh conditions | Involved in organic matter breakdown |
| Streptomyces | Tolerant of chemical exposure | Breaks down complex organics; produces geosmin (“earthy smell”) |
| Flavobacterium | Abundant in nutrient-rich soils | Aids in phosphorus cycling |
| Enterobacter | Rapid-growing, opportunistic | Some can fix nitrogen, others can be human/plant pathogens |
| Acinetobacter | Common in synthetic-fertilized soils | Highly resilient, some strains resist antibiotics |
Why These Bacteria Dominate:
- High synthetic nitrogen levels fuel fast-replicating bacterial species, often out-competing slower-growing beneficials.
- Pesticides and fungicides reduce fungal competitors, leaving bacteria unchecked.
- Tillage destroys fungal networks and exposes organic matter—perfect conditions for bacteria like Bacillus and Pseudomonas.
- Lack of carbon inputs (no cover crops, compost, or mulch) limits microbial diversity and selects for organisms that can scavenge quickly and survive harsh conditions.
Now when we look at fungi, it is a different story. Here is a list of what we typically see in the same conventional system.
| Genus | Why It’s Dominant | Function / Impact |
| Fusarium | Thrives in disturbed soils and residues | Often pathogenic – causes wilt, root rot, seedling blight |
| Aspergillus | Tolerates heat, drought, and nutrient-poor conditions | Some species produce mycotoxins; others aid decomposition |
| Penicillium | Rapid colonizer of residues, can handle harsh environments | Can break down organic matter; some strains are pathogenic |
| Rhizoctonia | Persists in compacted or anaerobic zones | Soilborne pathogen; causes damping-off and root rot |
| Alternaria | Common in residues, especially post-harvest | Pathogenic to leaves and stems; produces spores easily |
| Trichoderma | Opportunistic; more common with organic matter inputs | Some species are beneficial, biocontrol agents |
| Cladosporium | Found in air, plant surfaces, and decaying matter | Generally harmless, but thrives in disrupted environments |
Why These Fungi Dominate in Conventional Systems:
- Fungicides and tillage eliminate sensitive, symbiotic fungi—leaving only resistant or spore-producing strains.
- Residue-heavy environments without microbial diversity allow pathogens like Fusarium and Rhizoctonia to thrive.
- Low carbon inputs reduce food sources for fungal networks like mycorrhizae and saprophytic decomposers.
- Soil compaction and anaerobic pockets encourage the growth of fungi like Rhizoctonia that thrive in stressed environments.
But incorporating biological diversity into a commercial mono-cropped system requires more than just good intentions. It requires:
- A starting baseline.
- Manufacturer data, tests and trials.
- A system for feedback and adjustment (seasonal or annual re-testing)
It’s Time to Put Soil Biology to Work for You
If you’re transitioning into regenerative ag or biological farming, understanding fungi and bacteria is step one. But understanding how they work together—and how to apply the right solution for your specific system—is where the real power lies.
With the tools we have today—especially metagenomics and data-backed biological products—you’re no longer guessing. You’re managing biology the same way you’ve managed nutrients for decades: strategically, efficiently, and with results in mind.
