Soil Carbon Sequestration in Conservation Agriculture

Conservation agriculture, founded on minimal soil disturbance, permanent soil cover and crop rotations, offers a sustainable pathway to enhance soil organic carbon (SOC) stocks while maintaining productivity. By reducing mechanical tillage and retaining crop residues, conservation systems promote aggregate stability, increase water infiltration and foster microbial communities that stabilise carbon in the soil matrix. These processes mitigate atmospheric carbon dioxide levels and improve soil fertility, resilience to extreme weather and long-term crop yields. Across diverse climates and soil types, the magnitude of carbon sequestration depends on the balance between carbon inputs from plant biomass and outputs via decomposition and erosion. Incorporating no-tillage or reduced-tillage practices, combined with cover cropping and residue management, can raise SOC primarily in the topsoil horizon, create physical protection of organic matter and stimulate microbial biomass carbon, thereby supporting broader ecosystem services and global climate objectives.

Research from Nature Portfolio

Recent studies have demonstrated that conservation agriculture under experimental warming scenarios leads to sustained increases in SOC and microbial biomass. Eight years of field trials comparing conservation and conventional tillage revealed linear accumulations of SOC and microbial carbon under minimal disturbance, coupled with enhanced fungal diversity. These changes were directly associated with improved wheat yields, illustrating that conservation practices not only sequester carbon but also bolster crop resilience under temperature stress.

Further analysis of global no-tillage adoption has shown that soil and climatic conditions critically determine the net carbon storage potential of reduced tillage. Evidence indicates that certain soil textures and moisture regimes are particularly conducive to SOC gains under no-tillage, whereas other contexts yield negligible or offsetting effects due to carbon redistribution within the profile. This work underlines the co-benefit of no-tillage in reducing erosion and greenhouse gas emissions, emphasising its role in climate adaptation and food security.

Soil Carbon Sequestration in Conservation Agriculture publication trend

The graph below shows the total number of articles in soil carbon sequestration in conservation agriculture across all publications each year (not limited to Nature Index journals).

Technical terms

Soil organic carbon (SOC): The fraction of organic compounds in soil, derived from decomposed plant and microbial residues, which contributes to soil fertility and carbon sequestration.

Conservation agriculture: An integrated management system based on minimal soil disturbance, permanent organic soil cover and diversified crop rotations aimed at sustainable productivity and resource conservation.

No-tillage: A tillage method in which the soil is left undisturbed from harvest to planting except for nutrient injection, preserving soil structure and organic matter.

Crop residue retention: The practice of leaving post-harvest plant materials on the soil surface to protect against erosion, enhance moisture retention and supply carbon inputs.

Microbial biomass carbon: The living component of soil organic matter, representing the sum of microbial cells that drive nutrient cycling and contribute to organic carbon stabilization.

References

1. Conservation agriculture improves soil health and sustains crop yields after long-term warming. Nature Communications (2024).
2. Conservation tillage in temperate rice cropping systems: Crop production and soil fertility. Field Crops Research (2024).
3. The Ability of Conservation Agriculture to Conserve Soil Organic Carbon and the Subsequent Impact on Soil Physical, Chemical, and Biological Properties and Yield. Frontiers in Sustainable Food Systems (2020).
4. Climate and Soil Characteristics Determine Where No-Till Management Can Store Carbon in Soils and Mitigate Greenhouse Gas Emissions. Scientific Reports (2019).
5. Carbon Sequestration to Avoid Soil Degradation: A Review on the Role of Conservation Tillage. Plants (2021).