Biochar in Natural Farming: Can Turning Crop Waste Into Charcoal Help Improve Soil Health?

Farmers often have crop residues, pruning waste and other plant material left after harvest. When these materials are burned openly, they can produce smoke and waste a potential resource. Biochar offers another use for suitable biomass by converting it into a stable, carbon-rich material that can be applied to soil.

Biochar is produced by heating biomass under limited oxygen, a process known as pyrolysis. It differs from ordinary wood ash and charcoal because its properties depend on the feedstock and production conditions. Properly made biochar may improve soil structure, water retention and nutrient availability, although results vary with soil type and crop.

An article published in ICAR’s Indian Farming journal in July 2026 described biochar as a potential tool for soil regeneration and agricultural sustainability. It highlighted nutrient retention, water-holding capacity and long-term carbon storage as possible benefits. These outcomes depend on how the material is produced and used.

Five Things Farmers Should Know Before Using Biochar

1. Choose the Right Raw Material

Biochar can be produced from suitable plant-based materials, including crop residues, woody waste and some agricultural by-products. The material must be clean and free from treated wood, plastics, painted waste and other contaminants. Feedstock quality influences the final product and whether it is suitable for agricultural use.

Farmers should identify which residues are available locally before considering production. Cotton stalks, for example, have attracted research attention because they can be converted into useful products rather than discarded. ICAR-CIRCOT has explored cotton-stalk biochar and the practical challenges of transporting bulky residues to processing facilities.

2. Do Not Confuse Biochar With Ash

Biochar is not the same as the grey ash left after crop residues burn completely. Open burning does not provide the controlled conditions needed to produce a consistent soil amendment. Farmers should not collect random burnt material from fields and assume it has the same properties as tested biochar.

Production under limited oxygen helps retain more carbon in the resulting material. The temperature, heating time and type of biomass affect its properties. If farmers want to make biochar, they should seek technical guidance on appropriate equipment and safe operating practices rather than burn residues in an uncontrolled fire.

3. Check Soil Conditions Before Application

Biochar can affect soil differently depending on its pH, texture, organic matter and nutrient status. Some products may help improve water retention or nutrient holding in particular soils, while others may offer little benefit. A soil test and product analysis can help farmers decide whether an application is appropriate.

Farmers should ask their Krishi Vigyan Kendra (KVK), agricultural university or soil-testing laboratory for advice before applying biochar. They should also check the material’s pH, salinity and potential contaminants. Do not assume that a higher application rate will deliver better results or that biochar can replace all fertilisers.

4. Apply It With a Planned Nutrient Strategy

Biochar is generally considered a soil amendment rather than a complete fertiliser. Its nutrient content varies with the raw material and production method. Farmers should continue to meet crop nutrient requirements through soil-test-based fertiliser use, suitable organic manures and other recommended practices.

Researchers are also investigating ways to enrich biochar so that it contributes more effectively to crop nutrition. ICAR-CIRCOT reported research on enriching cotton-stalk biochar using banana pseudostem sap and phosphate-solubilising bacteria. Such work is still developing, so farmers should not assume every biochar product has these properties. <Cite refs={[“turn721245search9”]}/>

5. Start With a Small, Measured Trial

Farmers interested in biochar should first test it on a small plot rather than treating an entire field. Compare crop growth, soil moisture, nutrient management and costs against a similar untreated area. Keep other practices as consistent as possible so that the comparison provides useful information.

Record the quantity applied, the cost of the material, labour and any changes in fertiliser or irrigation use. Repeat observations across crop stages and, where possible, more than one season. A small trial helps farmers judge whether biochar provides enough practical benefit to justify a larger investment.

Can Biochar Create Value From Farm Waste?

Biochar production may offer an alternative use for crop residues and plantation waste. In some situations, local processing could also create opportunities for farmer groups or rural enterprises. The economics depend on the availability of biomass, equipment costs, transport, processing capacity and demand for the final product.

ICAR-CIRCOT has discussed the possibility of converting cotton stalks into biochar and exploring farmer carbon-credit opportunities. A separate ICAR-CCARI programme in Goa examined biochar production from plantation residues in the context of voluntary carbon markets. These are developing initiatives, not a guarantee that every farmer can earn carbon-credit payments.

Farmers considering a business should first confirm whether buyers exist for the biochar, what quality standards they require and how much processing costs. Carbon-credit projects may require formal measurement, verification and long-term commitments. Farmers should seek independent advice before paying fees or signing agreements that promise assured carbon-credit income.

Where Can Farmers Get Practical Advice?

The nearest KVK or agricultural university can help farmers assess whether biochar is suitable for their soil and crop. Ask about tested products, recommended application rates, safe production methods and any local demonstration plots. Farmers should prioritise research-backed guidance over unverified claims from sellers.

ICAR-CIRCOT has been working on agricultural residue utilisation, while ICAR’s research publications discuss biochar’s possible soil and environmental benefits. Farmers can consult these sources before investing in production equipment or buying soil amendments.

Biochar may help recycle crop waste and improve selected soil properties, but it is not a universal solution for poor soil or low yields. Farmers should use clean feedstock, avoid uncontrolled burning, check soil conditions and test the product on a small plot. Practical results and costs should guide any wider adoption.