Biochar Found to Mitigate Greenhouse Gas Emissions in Soil

Strategic Insights -

Researchers at the Chinese Academy of Sciences have found that biochar amendments in soil can significantly reduce greenhouse gas emissions while increasing crop yields. The study, conducted in a field experiment, demonstrated that biochar-amended fields reduced nitrogen oxide emissions by 63.1% and methane uptake by 320.7% compared to conventional fertilized fields. This resulted in a net reduction of 538.4 kg ha-1 in CO2 equivalent emissions. Additionally, the biochar-amended fields showed increased crop yields by 10.9%. In contrast, straw-amended fields resulted in a net increase of 1261.2 kg CO2eq ha-1 in CO2 emissions.

Key Takeaways:

  • Biochar amendments in soil reduced greenhouse gas emissions by 538.4 kg ha-1 in CO2 equivalent emissions, with a reduction of 63.1% in nitrogen oxide emissions and 320.7% in methane uptake.
  • Biochar-amended fields showed increased crop yields by 10.9%.
  • Straw-amended fields resulted in a net increase of 1261.2 kg CO2eq ha-1 in CO2 emissions.
  • The enhanced resistance to biochemical decomposition and adsorption interactions, facilitated by the aromatized stabilized structure and functional biochar groups, are key factors enabling biochar-amended soils to exhibit lower GHG emissions intensities than straw.
  • This study could represent a breakthrough in understanding how biochar balances soil carbon sequestration with GHG emissions while aiding in optimizing crop residue management practices.
  • Biochar amendments could be a potential measure to enhance soil carbon sequestration and combat climate change.

Statistics:

  • 63.1% reduction in nitrogen oxide emissions in biochar-amended fields
  • 320.7% increase in methane uptake in biochar-amended fields
  • 538.4 kg ha-1 reduction in CO2 equivalent emissions in biochar-amended fields
  • 10.9% increase in crop yields in biochar-amended fields
  • 1261.2 kg CO2eq ha-1 increase in CO2 emissions in straw-amended fields
  • 39% issue of Environmental Technology & Innovation, 2025

Sources:

  • Biochar Carbon-based Amendment Rather Than Straw Contributes To the Mitigation of Greenhouse Gas Emissions While Increasing Crop Yield: Insights From a Field Experiment and Density Functional Theory Calculation. Environmental Technology & Innovation, 2025;39.
  • NewsRx. Reports Outline Environment Study Findings from Chinese Academy of Sciences (Biochar Carbon-based Amendment Rather Than Straw Contributes To the Mitigation of Greenhouse Gas Emissions While Increasing Crop Yield: Insights From a Field ...). Global Warming Focus. August 4, 2025; p 1133.