Biochar: How Pyrolysis Can Turn India's Crop Residues into Soil Health and Farmer Income

India generates millions of tonnes of agricultural residues annually, and open-field burning remains a widespread disposal method — a practice that degrades air quality, destroys topsoil microbiota, and squanders a potentially valuable raw material. The scale of the problem makes business-as-usual increasingly untenable, both environmentally and economically.

Pyrolysis — the controlled heating of biomass in a low-oxygen environment — offers a direct conversion pathway. Rather than releasing carbon and particulates into the atmosphere, the process captures the energy and carbon locked in crop waste and redistributes it across three commercially relevant output streams: a solid (biochar), a gas (syngas), and a liquid (bio-oil).

Biochar (solid): The primary agronomic product, biochar improves soil organic carbon (SOC), enhances a soil's water-holding capacity, increases nutrient-use efficiency, and supports beneficial microbial communities. Over time, these effects can translate into lower fertiliser input costs for farmers — a concrete economic incentive alongside the environmental benefit.

Syngas (gas): The gaseous output can be used to generate heat or electricity, improving the overall energy efficiency of the pyrolysis operation itself and reducing its running costs.

Bio-oil (liquid): The liquid fraction carries potential applications in renewable energy and industrial processing, adding a third value layer to what would otherwise be waste biomass.

Together, the three streams reframe agricultural residue from a disposal burden into a multi-product feedstock.

India does not yet have a dedicated National Biochar Policy, but the technology aligns clearly with several live Government of India programmes:

• PM-PRANAM promotes sustainable nutrient management and reduced dependence on chemical fertilisers, making soil-improving technologies like biochar directly relevant to its mandate.
• Pradhan Mantri JI-VAN Yojana supports value addition from agricultural biomass and encourages residue-to-product conversion over burning.
• Crop Residue Management (CRM) initiatives fund and promote alternatives to stubble burning, targeting cleaner air and better biomass utilisation.

The absence of a dedicated biochar policy is a gap, but the alignment across three separate central schemes suggests that institutional groundwork is already in place for mainstreaming the technology.

Biochar's value proposition extends well beyond agronomy. As a stable, carbon-rich material derived from biomass, it functions as a long-term carbon sink — sequestering carbon that would otherwise be released through burning or decomposition. This makes it a credible input for verified carbon removal projects, potentially opening a secondary income stream for farmers who supply biomass or participate in structured programmes.

At the macro level, scaled biochar adoption supports multiple objectives simultaneously: reduced air pollution from stubble burning, improved farm-level soil health and productivity, rural energy generation from syngas, and a measurable contribution to India's Net Zero 2070 climate commitment. The convergence of agronomic, environmental, and economic benefit in a single technology is what distinguishes biochar from narrower soil-amendment solutions.