Generating Value from Biologicals Starts with Knowing Your Soil

Biologicals have become one of the most talked-about categories in agriculture. From nitrogen-fixing microbes to phosphorus-solubilizing products, residue degraders, biostimulants, and mycorrhizal fungi, growers have more options than ever.

That opportunity also creates a challenge: how do you know which biological products are worth trying, where they are most likely to work, and whether they can generate a reliable return?

In an April 15 Agweb.com article by Rhonda Brooks, featuring University of Illinois assistant professor Connor Sible and his field research on helping farmers evaluate biological products more carefully. The key message is clear: biologicals can be valuable tools, but they are not shortcuts around sound agronomy.

Biologicals Work Best Backed by Agronomy

Before considering any biological product, growers need to start with the foundation: soil pH, drainage, fertility, compaction, residue management, and overall field condition.

Biologics are often marketed as innovative solutions, but they only work well within the environment to which they are applied. If soil pH limits nutrient availability, drainage is poor, compaction restricts root growth, or fertility is out of balance, a biological product may not be able to overcome these issues on its own.

That is why biologicals should be treated as part of a broader crop plan, not as a replacement for one. Biological products are more likely to perform in fields that are already well managed, and they should not be expected to solve basic agronomic problems on their own.

Living Products Require Living-Product Management

One of the simplest but most important questions growers can ask is whether the product is alive.

If a product contains living organisms, then storage, handling, timing, tank-mixing, and application conditions matter. A living biological has to survive from the point of purchase to the moment it reaches the field. If that chain breaks, performance can suffer before the product ever has a chance to work.

For some operations, that may be manageable. For others, a non-living biostimulant may be a better fit. The point is not that one category is automatically better than another. The point is that product choice should match the grower’s management capacity, equipment, timing, and risk tolerance.

Biologicals Are Complements, Not Magic Bullets

Nitrogen is a good example. Biologicals may help improve nitrogen availability or efficiency, but they should not be viewed as a complete replacement for fertilizer, organic matter, or sound nutrient planning. The same is true for phosphorus. Microbes can help unlock phosphorus, but they work best when paired with a clear understanding of existing nutrient levels, soil chemistry, and crop demand.

The Missing Piece: Better Placement

One reason biological performance can feel inconsistent is that many products are applied broadly, even though field conditions vary dramatically across acres.

A field may have zones with different pH, nutrient availability, compaction, organic matter, water movement, biological activity, and pest or pathogen pressure. A biological product that makes sense in one part of a field may deliver little value in another.

That is where measurement changes the conversation.

EarthOptics TruBio analysis includes pest and pathogen detection as well as biofertility metrics, while EarthOptics broader service model includes fertility, compaction testing, soil scanning, laboratory processing through genetic sequencing, and data delivery.

EarthOptics helps growers move beyond “flying blind” on major input decisions. Internal materials identify biofertility measures such as soybean nitrogen fixation, soil nitrogen fixation, nitrification, denitrification, phosphorus solubilization, mycorrhizal fungi, plant growth promoters, and anaerobic potential.

From Product Selection to Product Fit

The most important question is not simply, “Does this biological work?”

A better question is, “Where is this biological most likely to work on my acres?”

That shift matters because biologicals often depend on highly specific field conditions. For example, an arbuscular mycorrhizal fungi product may be most relevant where AMF levels are low, and the crop system can benefit from improved root-soil interactions. A phosphorus-solubilizing product may be a better fit where phosphorus is present but not readily available. A nitrogen-related biological may be more useful when it complements, rather than replaces, a well-planned fertility program.

In an EarthOptics case study, a customer’s field measured low in mycorrhizal fungi, an AMF-specific product was applied to half the field, and the treated half showed a 20+ bushel-per-acre yield advantage. That is the practical value of soil intelligence: it helps turn biologicals from a broad-acre experiment into a more targeted decision.

Building Biologicals Into a Smarter Crop Plan

Biological products are not going away. In fact, they are likely to become a bigger part of how growers manage fertility, soil health, crop stress, and long-term sustainability. But the most successful use of biologicals will come from discipline, not hype.

• Growers and advisors should ask:
• Is the field agronomically ready for this product?
• Does the product match the soil biology and fertility conditions present?
• Is it meant to support nitrogen, phosphorus, residue breakdown, stress mitigation, or another goal?
• Where is the product most likely to pay?
• How will success be measured?

This is where EarthOptics fits naturally into the decision-making process. By combining soil biology, chemistry, physical measurements, and high-resolution field insights, EarthOptics helps growers understand where biologicals may create value — and where other agronomic issues should be addressed first.

Better Data Creates Better Biological Decisions

Biologicals can play an important role in modern crop production, but they are not one-size-fits-all tools. Their value depends on field conditions, product handling, management goals, and placement.

For growers, the path forward is not to avoid biologicals or adopt them blindly. It is to evaluate them using the same discipline applied to seed, fertility, crop protection, and equipment investments.

When producers know what is happening beneath the surface, they can make more confident decisions above it. EarthOptics helps bring that below-ground picture into focus, giving growers and advisors the information they need to place biologicals where they have the best chance to make a measurable difference.

Read our 2026 Predictive Ag Report to learn more about what biological risks and opportunities we are seeing throughout the Midwest.