Researchers and university officials advocate wider adoption of pyrolysis-based technology that converts agricultural residue into a long-term soil amendment, offering simultaneous benefits for farm productivity and climate mitigation
As India continues to grapple with the twin challenges of declining soil health and mounting agricultural carbon emissions, a centuries-old technique refined by modern science is drawing renewed attention from researchers and policymakers: biochar, a stable carbon-rich material produced from agricultural residue through controlled thermal decomposition, is being presented as one of the more compelling and scalable interventions available to Indian farming today.
Speaking at a biochar technology event in Hyderabad, Dr D. Raji Reddy, Vice Chancellor of Sri Konda Laxman Telangana State Horticultural University, said biochar not only boosts crop yields but also enables carbon sequestration, marking a significant step towards climate-smart agriculture. He urged farmers, scientists and students to adopt biochar-based technologies on a wider scale and assured them that the university would strengthen its research, training and awareness initiatives in the field.
The Science of Biochar
Biochar is produced through pyrolysis — the heating of organic material, typically agricultural residue, in a low-oxygen environment that prevents combustion and instead yields a porous, charcoal-like substance with a highly stable carbon matrix. Unlike compost or other organic amendments that decompose relatively rapidly, biochar persists in soil for centuries, sometimes millennia, making it one of the few agricultural interventions that delivers both immediate agronomic benefits and long-term carbon storage.
Dr Raji Reddy outlined biochar’s role in enhancing soil fertility, increasing water retention capacity and supporting microbial activity, and emphasised that it would serve as an important tool in reducing reliance on chemical fertilisers and mitigating the impacts of climate change.
Each of these functions addresses a specific and well-documented deficiency in India’s agricultural soils. Decades of intensive cultivation and over-reliance on synthetic fertilisers have progressively depleted organic matter across large tracts of farmland, diminishing both biological activity and structural integrity. The capacity of biochar-amended soils to retain moisture is particularly significant in the context of increasingly erratic monsoon patterns, which leave crops vulnerable to moisture stress during critical growth periods even in regions that receive adequate annual rainfall.
Residue Burning: A Problem That Is Also a Resource
The environmental and public health consequences of agricultural residue burning in India are well established. Each post-harvest season, particularly in the north-western states, the open burning of paddy straw releases large volumes of particulate matter, carbon dioxide, and other pollutants, contributing substantially to poor air quality across the Indo-Gangetic Plain and to the country’s overall greenhouse gas emissions.
The pyrolysis pathway offers a direct alternative. Rather than releasing the carbon stored in crop residue into the atmosphere through combustion, the process sequesters it in a chemically stable form that can be returned to agricultural land. India generates an estimated 500 million tonnes of agricultural residue annually. Even partial diversion of this material into biochar production would represent a measurable contribution to both soil carbon stocks and national emissions reduction targets under India’s commitments to the Paris Agreement.
The economic dimension is equally significant. India’s fertiliser subsidy burden runs to several thousand crore rupees annually. Biochar’s demonstrated ability to improve nutrient use efficiency and reduce leaching losses has direct implications for the quantity of synthetic fertilisers required to achieve a given crop yield — a consideration with consequences for farm-level expenditure as well as for public finances.
Institutional Momentum
Biochar expert Dr Arif Khan, Registrar Dr Bhagavan, Head of the Floriculture Research Station Dr Jyothi, Anita Kumari from the Vegetable Research Station, Associate Dean Dr Prashanth and other scientists participated in the event, indicating a degree of institutional breadth in the engagement with the technology that goes beyond a single discipline or department.
The involvement of a horticultural university is notable in this context. Horticulture, with its diverse crop types, varied soil requirements, and generally higher value-per-acre economics, may offer more immediate pathways for biochar adoption than broad-acre commodity agriculture — both because the economics of amendment are more favourable and because the controlled conditions of horticultural production lend themselves more readily to measuring and demonstrating the technology’s effects.
The Challenge of Scale
The scientific case for biochar is well established in international literature, and the agronomic evidence from field trials across multiple soil types and climatic zones is broadly supportive. The outstanding challenge is one of dissemination rather than discovery.
Scaling biochar production to meet the needs of India’s estimated 140 million farming households requires affordable and locally manufacturable pyrolysis equipment, crop and region-specific guidance on application rates and methods, institutional support for demonstration and training, and integration with existing government schemes for soil health and sustainable agriculture. The commitment expressed by SKLTHU to strengthen research, training and awareness is a necessary step, though the distance from university initiative to widespread farmer adoption in the Indian context is considerable and demands sustained policy attention.
The technology’s promise, however, is proportionate to that challenge. An intervention that simultaneously addresses soil degradation, reduces synthetic input dependence, provides drought resilience, and sequesters carbon at scale is not a commonplace proposition in agricultural science. Biochar does not resolve the structural challenges facing Indian agriculture, but it addresses several of them simultaneously — which, in the complex calculus of sustainable farming, is a meaningful distinction.
