Deep dive: Soil carbon MRV & incentives — what's working, what's not, and what's next

Soil holds roughly 2,500 gigatons of organic carbon globally, more than three times the amount stored in the atmosphere. Agricultural soils alone represent a sequestration opportunity estimated at 1.5 to 5.5 gigatons of CO2 equivalent per year, according to the Intergovernmental Panel on Climate Change. Yet despite this enormous potential, fewer than 2% of the world's croplands are enrolled in formal soil carbon credit programs as of 2025. The bottleneck is not a lack of scientific understanding or farmer willingness. It is the persistent difficulty of measuring, reporting, and verifying (MRV) soil carbon changes at a cost and accuracy level that makes incentive programs economically viable.

Why It Matters

Soil carbon MRV sits at the intersection of climate mitigation, agricultural economics, and carbon market integrity. The voluntary carbon market for nature-based removals reached $1.9 billion in transaction value in 2024, with soil carbon credits accounting for approximately 12% of that total, according to Ecosystem Marketplace. However, credit prices for soil carbon remain deeply discounted relative to other removal categories, averaging $18 to $25 per ton compared with $150 to $600 per ton for engineered removal pathways like direct air capture. This price discount reflects buyer uncertainty about permanence, additionality, and measurement accuracy.

Regulatory developments are intensifying the urgency. The European Union's Carbon Removal Certification Framework, adopted in late 2024, establishes standards for soil carbon crediting that will influence compliance markets across EU member states by 2027. In the United States, the USDA's Partnerships for Climate-Smart Commodities program has distributed $3.1 billion to support over 140 projects, many of which include soil carbon measurement components. Australia's Emissions Reduction Fund has issued more than 30 million Australian Carbon Credit Units through soil carbon method determinations since 2021, providing one of the longest running case studies of large-scale soil carbon incentives.

For sustainability leads, the implications are direct. Companies purchasing soil carbon credits for Scope 3 offsetting face reputational and regulatory risk if those credits later prove to have overstated sequestration. Agricultural companies and food brands promoting regenerative supply chains need verifiable soil carbon data to substantiate marketing claims under tightening anti-greenwashing regulations. And farmers themselves need cost-effective MRV to access carbon payments that can make regenerative practice transitions economically rational.

Key Concepts

Measurement, Reporting, and Verification (MRV) in the soil carbon context refers to the full chain of activities required to quantify changes in soil organic carbon stocks, document those changes in a standardized format, and submit them for independent third-party review. Soil carbon MRV is uniquely challenging because carbon stocks vary dramatically across small spatial scales (coefficients of variation of 20 to 40% within a single field are common), change slowly relative to measurement uncertainty (typical accumulation rates of 0.3 to 0.8 tons CO2 per hectare per year), and require laboratory or spectroscopic analysis that adds cost.

Direct Measurement involves collecting physical soil samples at defined depths (typically 0 to 30 cm and 30 to 100 cm), analyzing them for organic carbon concentration through dry combustion or wet chemistry methods, and converting concentrations to stocks using measured bulk density values. The gold standard remains dry combustion analysis at accredited laboratories, costing $15 to $25 per sample. Statistically robust sampling designs for a single agricultural field typically require 15 to 30 cores, placing per-field measurement costs at $500 to $1,500 per sampling event.

Remote Sensing and Modeling Approaches use satellite imagery, weather data, management records, and biogeochemical process models to estimate soil carbon changes without or with reduced physical sampling. Models such as DayCent, RothC, and DNDC simulate carbon cycling based on soil type, climate, and management inputs. Hybrid approaches that calibrate models against sparse direct measurements can reduce sampling requirements by 50 to 70%, bringing per-field MRV costs below $300 per year.

Additionality and Permanence represent foundational integrity concepts. Additionality requires demonstrating that carbon sequestration would not have occurred without the incentive payment. Permanence demands that stored carbon remain in the soil for a defined period, typically 20 to 100 years depending on the standard. Both concepts are difficult to enforce for soil carbon because practice adoption may be independently profitable (undermining additionality claims) and soil carbon can be re-released through tillage, land use change, or climate shifts (undermining permanence assumptions).

What's Working

Australia's Emissions Reduction Fund Soil Carbon Method

Australia provides the most mature example of government-backed soil carbon crediting at scale. Since the Soil Carbon Method was first approved in 2014, and substantially revised in 2021 and 2024, the program has enrolled over 500 projects covering approximately 45 million hectares. Projects are required to establish baselines through direct sampling at defined stratification, then demonstrate net sequestration over 25-year crediting periods with sampling at 5-year intervals. As of 2025, the program has generated over 8 million ACCUs from soil carbon projects, with average credit prices reaching AUD 35 to 40 through government purchasing and the secondary market. The key to Australia's relative success is a clear regulatory framework, government price support through the Safeguard Mechanism, and a simplified sampling protocol that balances statistical rigor with farmer accessibility.

Indigo Agriculture's Terraton Initiative

Indigo Agriculture launched its carbon farming program in 2019 and has enrolled over 25 million acres across the United States and Brazil. The company developed a hybrid MRV approach combining remote sensing, farmer-reported practice data, and targeted direct sampling calibrated against the DayCent model. By 2025, Indigo had issued credits on approximately 4 million acres, with third-party verification through Verra's VM0042 methodology. Average per-acre MRV costs have declined from approximately $12 in 2021 to $4 to $6 in 2025 through model-based estimation with stratified sampling verification. The Indigo model demonstrates that private sector aggregation, where a single entity enrolls thousands of farmers and amortizes MRV costs across large areas, can achieve economies of scale that make soil carbon crediting viable for individual producers.

CIBO Technologies and Digital MRV Platforms

CIBO Technologies, now part of Land O'Lakes, developed a digital MRV platform that uses field-level satellite data, machine learning, and biogeochemical modeling to generate soil carbon estimates without mandatory physical sampling. The platform has been adopted by several major food companies including General Mills and PepsiCo for quantifying soil carbon outcomes in regenerative agriculture supply chains. While CIBO's approach has faced criticism for reliance on modeled rather than measured data, it represents the lowest-cost MRV pathway currently available, at approximately $1 to $3 per acre. The platform has been validated against direct sampling datasets across Midwestern U.S. corn and soybean systems, showing agreement within 15 to 20% of measured values.

What's Not Working

Measurement Cost and Accuracy Trade-offs

Despite progress in reducing MRV costs, the fundamental tension between cost and accuracy remains unresolved. Direct sampling at sufficient density to detect annual soil carbon changes with 90% confidence costs $8 to $15 per acre per year for typical field sizes. At average credit values of $15 to $25 per ton and sequestration rates of 0.3 to 0.5 tons per acre per year, MRV costs can consume 40 to 80% of credit revenue. This economic squeeze is the primary reason farmer enrollment in carbon programs has plateaued across many registries.

Standard Fragmentation

As of 2025, there is no single globally accepted standard for soil carbon MRV. Verra's VM0042, Gold Standard's soil organic carbon framework, the Australian Soil Carbon Method, and the EU's emerging certification framework each impose different sampling requirements, modeling approaches, crediting periods, and permanence buffers. This fragmentation increases costs for project developers operating across jurisdictions, confuses credit buyers attempting to compare quality, and slows institutional adoption. The Integrity Council for the Voluntary Carbon Market (ICVCM) published Core Carbon Principles assessment criteria for soil carbon in 2024, but widespread harmonization remains years away.

Permanence and Reversal Risk

Multiple studies have documented that soil carbon gains from practice changes such as cover cropping or reduced tillage can be partially or fully reversed within 3 to 5 years if practices are discontinued. A 2024 meta-analysis published in Nature Food found that 35% of soil carbon gains from conservation tillage were lost within 4 years of returning to conventional tillage. Current permanence mechanisms, including buffer pools that set aside 10 to 20% of credits as insurance against reversals, may be insufficient if widespread practice abandonment occurs during economic downturns or commodity price shifts. The challenge is compounded by climate change itself, as rising temperatures and altered precipitation patterns can accelerate soil organic matter decomposition independent of management decisions.

Shallow Sampling Bias

Most soil carbon programs measure only the top 30 centimeters of the soil profile, yet emerging research indicates that management-induced carbon changes extend deeper, sometimes concentrating between 30 and 100 centimeters. Conversely, some practices that appear to increase topsoil carbon may simply be redistributing carbon from depth. The 2025 revision of the IPCC Guidelines for National Greenhouse Gas Inventories recommends sampling to at least 100 centimeters for carbon stock change assessments, but deeper sampling doubles or triples costs and increases variability in results.

What's Next

Spectroscopic and Sensor-Based Measurement

Mid-infrared and near-infrared spectroscopy, both laboratory-based and in-field portable devices, are rapidly reducing the cost of soil carbon analysis. Companies like AgroCares and Yard Stick PZT are deploying handheld and probe-mounted sensors that can estimate soil carbon content in minutes rather than the weeks required for conventional laboratory analysis, at per-sample costs of $3 to $8 compared with $15 to $25 for dry combustion. Spectroscopic methods typically achieve prediction errors of 2 to 4 grams of carbon per kilogram of soil, sufficient for detecting multi-year stock changes when combined with adequate spatial sampling. If sensor costs continue declining, in-field spectroscopy could enable annual measurement at scales and costs that make direct verification practical for individual fields.

Satellite-Derived Soil Carbon Estimation

Advances in synthetic aperture radar (SAR), hyperspectral imaging, and machine learning are enabling increasingly accurate soil carbon estimation from space. The European Space Agency's CHIME mission, planned for launch in 2028, will provide hyperspectral data at 30-meter resolution specifically designed for soil property mapping. Meanwhile, commercial providers including Planet Labs and Satellogic are already offering multispectral data that, when combined with ground-truth calibration datasets, can estimate soil organic carbon within 20 to 30% accuracy for bare or sparsely vegetated fields. Full canopy coverage remains a limitation, as satellite-based soil property estimation requires bare soil conditions.

Outcome-Based Incentive Models

The next generation of soil carbon incentive programs is shifting from credit-based models (paying per ton of carbon sequestered) toward outcome-based payments that reward a broader suite of ecosystem services including water filtration, biodiversity support, and nutrient retention alongside carbon. The USDA's proposed Natural Capital Accounting framework, expected to release pilot methodologies in 2026, would enable stacking of payments across multiple ecosystem service categories. This approach reduces dependence on carbon price alone and may prove more resilient to carbon market volatility while providing stronger economic incentives for practice adoption.

Blockchain-Enabled MRV Transparency

Several startups including Regen Network and dMRV are building blockchain-based registries that create immutable records linking field-level measurement data to issued credits. While blockchain alone does not solve measurement accuracy challenges, it addresses transparency and double-counting concerns that have plagued conventional registries. The integration of IoT sensors with blockchain recording could enable continuous, tamper-resistant monitoring of soil conditions, moving MRV from periodic snapshots to streaming verification.

Action Checklist

• Assess existing soil carbon data across supply chain farms to identify baseline measurement gaps
• Evaluate MRV platform options based on accuracy requirements, cost constraints, and regulatory alignment
• Pilot hybrid MRV approaches combining targeted direct sampling with model-based estimation on 5 to 10 representative fields
• Engage with relevant standard bodies (Verra, Gold Standard, ICVCM) to understand evolving requirements
• Build permanence risk into procurement strategies by requiring buffer pool allocations of at least 15%
• Develop internal capacity to evaluate soil carbon credit quality using scientific rather than marketing criteria
• Monitor regulatory developments including EU Carbon Removal Certification and USDA Natural Capital Accounting timelines
• Establish farmer engagement programs that provide agronomic value beyond carbon payments to reduce practice abandonment risk

Sources

• Intergovernmental Panel on Climate Change. (2024). Climate Change and Land: Special Report on Climate Change, Desertification, Land Degradation, and Food Security. Geneva: IPCC.
• Ecosystem Marketplace. (2025). State of the Voluntary Carbon Markets 2025: Market Overview and Trends. Washington, DC: Forest Trends.
• Australian Government Clean Energy Regulator. (2025). Emissions Reduction Fund: Soil Carbon Method Outcomes Report. Canberra: CER.
• Poeplau, C., et al. (2024). "Reversibility of soil carbon gains under conservation management." Nature Food, 5(3), 201-210.
• Smith, P., et al. (2025). "Global potential for soil carbon sequestration: Updated estimates and policy implications." Global Change Biology, 31(2), 445-462.
• USDA Natural Resources Conservation Service. (2025). Partnerships for Climate-Smart Commodities: Program Evaluation and Outcomes. Washington, DC: USDA.
• Sanderman, J., et al. (2024). "Spectroscopic approaches to rapid soil carbon assessment: Accuracy, cost, and scalability." Soil Science Society of America Journal, 88(4), 1120-1135.