Soil carbon & regenerative agriculture

Regenerative agriculture is based on a set of complementary practices: cover crops maintain permanent coverage that feeds the soil with organic matter; reduced tillage preserves mycorrhizal networks; long rotations diversify inputs; and biostimulants like Nutrigeo stimulate the biological activity that transforms organic matter into stable humus.

Beyond carbon, these practices generate major co-benefits: improved soil biodiversity, better water retention, reduced erosion, and increased farm resilience to climate hazards.

The carbon sequestration potential of French agricultural soils is well documented. The '4 per 1000' initiative, launched by France at COP21 in 2015 and led by INRAE, posits that a 0.4% annual increase in global soil organic carbon stocks would offset a significant share of human CO₂ emissions. At the French scale, INRAE's 2019 study estimates agricultural soils can sequester between 1.9 and 3.4 million tonnes of carbon per year under optimal conditions, equivalent to 6 to 12 million tonnes of CO₂. Observed ranges on certified projects are 1 to 3 tCO₂e per hectare per year, varying widely with soil type, climate, cultivation history and the combination of practices.

The credibility of a soil carbon credit rests entirely on the quality of the MRV (Monitoring, Reporting, Verification) protocol. Modern MRV combines three layers of evidence. First: dMRV (digital MRV) measurements based on multispectral satellite data (Sentinel-2, Landsat) coupled with agronomic models to estimate carbon flows per hectare and per year. Second: field soil sampling at regular intervals (typically every 3 to 5 years) on statistically representative grids, analysed in laboratory to measure the actual soil organic carbon stock. Third: independent verification by an accredited auditor (DNV, TÜV, Bureau Veritas) that checks consistency between satellite data, samples and the developer's declarations. This triangulation is what distinguishes a robust soil credit from a simple promise.

The co-benefits of regenerative agriculture go well beyond carbon sequestration alone. Improved soil organic matter increases water retention capacity, reducing drought vulnerability and runoff. Permanent soil cover lowers wind and water erosion, which destroys millions of tonnes of arable soil each year in Europe. Diversified rotations and lower chemical inputs restore soil biodiversity (earthworms, mycorrhizae, microbiota) and surface biodiversity (beneficial insects, pollinators, birds). Several studies (Rodale Institute, INRAE, IDDRI) document a medium-term stabilisation, then increase, in yields, alongside significant input cost reductions. It is this bundle of benefits, not carbon alone, that makes the model economically viable for the farmer.

For the farmer, carbon credits create complementary income that finances the transition to regenerative agriculture. The typical economic model: over a 5 to 10 year project, the farm receives an annual payment calculated from certified tCO₂e sequestered, after development, MRV and certification fees. Depending on the standard, practice combination and soil productivity, this typically represents 30 to 120 € per hectare per year in France. On a 200-hectare farm, this can be 6,000 to 24,000 € annually, on top of farming revenue and CAP support. Beyond income, regenerative practices reduce input costs (fertiliser, pesticides) and stabilise yields in difficult climate years. It is a model that secures the farm long-term.