Carbon Footprint Reduction in Crop Production

The global drive to limit climate change has placed crop production under scrutiny for its greenhouse gas emissions. Major sources include the manufacture and application of synthetic fertilisers, fuel use by agricultural machinery, methane release from flooded rice paddies and nitrous oxide emissions from soil. Mitigation strategies encompass precision nutrient management, adoption of no-till or reduced-tillage practices, integration of cover crops and legumes, intercropping systems and regional optimisation of crop trade. These approaches can both curb emissions and enhance soil carbon sequestration, supporting yield stability and farm profitability. By tailoring practices to soil and climate conditions and by balancing productivity with ecosystem services, researchers and practitioners aim to align food security with national and international carbon-neutrality targets.

Research from Nature Portfolio

Advanced modelling of interprovincial maize trade has revealed that optimised redistribution of grain can reduce national carbon emissions while also alleviating nitrogen losses. By combining a life cycle assessment framework with linear programming, researchers identified specific export regions where shifting maize flows yields the greatest mitigation potential.

Field trials of semiarid spring wheat have demonstrated that fertiliser applications based on soil testing, reduced summer fallow frequency and rotations with grain legumes can convert wheat systems from net emitters into net carbon sinks. Improved practices achieved annual soil carbon gains exceeding on-farm emissions, effectively lowering the crop’s carbon footprint and sustaining yields.

Long-term studies of a marginal-land grass species intercropped with a nitrogen-fixing legume showed that replacing synthetic nitrogen inputs with biological fixation can cut nitrous oxide emissions by up to half without sacrificing biomass production. Intercropping prairie cordgrass with clover increased soil nitrogen stocks and reduced overall global warming potential, illustrating the benefits of legume partnerships.

Carbon Footprint Reduction in Crop Production publication trend

The graph below shows the total number of articles in carbon footprint reduction in crop production across all publications each year (not limited to Nature Index journals).

Technical terms

Carbon footprint: The total greenhouse gas emissions expressed as carbon dioxide equivalent from all stages of crop production, including inputs, field operations and soil-derived gases.

Life cycle assessment: A systematic methodology for quantifying environmental impacts of a product or process from resource extraction through to its end-use or disposal.

Intercropping: The simultaneous cultivation of two or more crops in proximity to enhance resource use efficiency, pest control and soil health.

Soil carbon sequestration: The process by which atmospheric carbon is captured and stored in soil organic matter through plant growth and management practices.

No-tillage farming: An agricultural practice that reduces soil disturbance by eliminating or minimising ploughing, thereby preserving soil structure and organic carbon.

References

1. China can enhance its carbon and nitrogen reduction potential by optimizing maize trade across provinces. Communications Earth & Environment (2024).
2. Improving farming practices reduces the carbon footprint of spring wheat production. Nature Communications (2014).
3. Intercropping kura clover with prairie cordgrass mitigates soil greenhouse gas fluxes. Scientific Reports (2020).
4. Effects of multi-cropping system on temporal and spatial distribution of carbon and nitrogen footprint of major crops in China. Global Ecology and Conservation (2020).
5. Carbon, Nitrogen and Water Footprints of Organic Rice and Conventional Rice Production over 4 Years of Cultivation: A Case Study in the Lower North of Thailand. Agronomy (2022).
6. Maize‐based intercropping systems achieve higher productivity and profitability with lesser environmental footprint in a water‐scarce region of northwest China. Food and Energy Security (2020).