Biochar – Converting Waste into Agricultural and Climate Wealth

Biochar – Converting Waste into Agricultural and Climate Wealth
What is Biochar 
•    Biochar is a carbon-rich material produced by heating agricultural or organic waste under low-oxygen conditions through a process known as pyrolysis.
•    Unlike ordinary organic matter, biochar decomposes very slowly and therefore locks carbon in the soil for long periods, making it a carbon-negative technology.
•    Its highly porous structure improves soil aggregation, enhances water retention, promotes microbial activity, and increases nutrient-use efficiency.
•    Studies have shown that biochar can improve crop productivity by 10–30% and increase soil water-holding capacity by 10–25%, especially in nutrient-deficient and degraded soils.
•    Long-term field studies indicate that biochar not only improves soil fertility but also helps sustain higher crop yields over extended periods.
Why is it important?
•    India continues to burn valuable agricultural biomass instead of recycling it into productive resources, with Punjab and Haryana alone burning more than 20 million tonnes of paddy straw annually due to short post-harvest windows and the absence of practical alternatives.
•    Crop residue burning releases greenhouse gases and particulate pollutants, while simultaneously destroying organic matter that could improve soil fertility.
•    At the same time, soils across India, including the black soils of Maharashtra and the red soils of Kerala, suffer from low soil organic carbon, poor water-holding capacity, and declining nutrient retention, highlighting the need for sustainable soil restoration solutions.
Evidence from India and Abroad
•    Field trials in Akola district of Maharashtra demonstrated that biochar produced from maize stalks improved soil organic carbon levels and overall fertility in black soils.
•    Research conducted in Kerala found that biochar derived from coconut leaf stalks enhanced soil quality across different cropping systems, demonstrating the value of locally available biomass resources.
•    In Kenya, biochar produced from rice husks generated certified carbon credits while improving soil pH and phosphorus availability.
•    Thailand has integrated biochar into national soil rehabilitation and carbon management programmes by linking certification mechanisms with its national carbon registry system.
•    Research by Brazil’s Embrapa Institute reported significant yield gains and high carbon retention using biochar produced from sugarcane bagasse.
Role in Climate Resilience, Carbon Markets and Circular Economy
•    As droughts, heatwaves, and erratic rainfall become more frequent, biochar can improve the resilience of agricultural systems by increasing soil moisture retention and nutrient availability.
•    These benefits are particularly important for small and marginal farmers who are most vulnerable to climate-related stresses.
•    Biochar aligns closely with India's goals relating to natural farming, soil health management, carbon farming, and climate-resilient agriculture.
•    Under internationally accepted carbon accounting standards, biochar qualifies as a long-term carbon sequestration technology and can generate carbon credits.
•    Under the VM0042 Agricultural Land Management Methodology, every tonne of certified biochar can generate approximately 2–2.8 tonnes of CO₂-equivalent carbon credits through avoided emissions and carbon storage.
•    Projects such as the KISAN Kiln developed by IIT Kharagpur are exploring ways to help small farmers convert agricultural waste into marketable carbon assets.
•    Biochar also supports the principles of the circular economy by transforming waste streams into productive resources rather than allowing them to become sources of pollution.
Future Potential and Challenges
•    The feedstock for biochar extends beyond agricultural residues and includes municipal organic waste, sewage sludge, and other biodegradable materials.
•    India generates approximately 62 million tonnes of municipal solid waste annually, more than half of which is biodegradable and could potentially be converted into biochar.
•    Despite its benefits, biochar remains largely confined to pilot projects and research trials, and awareness among farmers remains limited.
•    Large-scale adoption will require decentralized pyrolysis technologies, robust measurement and verification systems, carbon-market linkages, institutional support, and improved farmer outreach.
•    If supported through an integrated ecosystem of innovation, investment, entrepreneurship, and policy incentives, biochar can simultaneously improve soil health, enhance farmer incomes, reduce pollution, and contribute to climate mitigation.