How betterSoil uses biochar to restore soil fertility
Healthy soil is the foundation of sustainable agriculture. Learn how betterSoil uses biochar to improve soil health, enhance nutrient retention, support water efficiency and promote sustainable farming practices for long-term soil restoration and a healthier, greener future.
Biochar: from waste to resources
Biochar is a highly porous, carbon-rich substance produced through the thermal decomposition of biomass under low-oxygen conditions, a process known as pyrolysis. Operating typically at temperatures between 300oC and 700oC, slow pyrolysis transforms organic ‘waste’ − such as crop residues, wood scraps and weeds − into a stable, solid form of carbon.
Instead of allowing agricultural waste to decompose or be burned openly (which releases carbon dioxide and air pollutants into the atmosphere), biochar technology effectively traps carbon in a structural grid. The resulting material is characterized by an incredibly high specific surface area and a complex network of micro−, meso− and macropores that allow it to act like a permanent ecological sponge in the ground.
The science of biochar and soil health
When incorporated into agricultural fields, biochar acts as a powerful soil conditioner that permanently upgrades the physical and biological architecture of the land.
- Moisture conservation: the sponge-like structural matrix of biochar allows it to absorb and retain several times its weight in water. This prevents rapid groundwater evaporation and ensures that crops remain resilient during intense heat waves or dry spells.
- Nutrient retention: biochar increases the soil’s CEC (Cation Exchange Capacity). When synthetic or organic fertilisers are applied, biochar acts as a storage vault, binding key minerals and preventing them from washing away via nutrient leaching or running off into local waterways.
- Microbial sanctuaries: the vast network of tiny internal pores offers a haven for beneficial earthworms, fungi
,and microbes. These organisms colonize biochar pores, stabilising soil organic matter and speed up natural nutrient mineralization. - pH regulation: because biochar typically possesses an alkaline pH, its structural ‘limiting effect’ can normalize highly acidic soils by raising their pH by one to two units, balancing the environment for optimal root development.
EU-funded project at Wipperfürth SoLawi
As part of our global projects, betterSoil worked on an EU-funded project at a SoLawi (Solidary Agriculture) farm in Wipperfürth, Germany, with innovative farmers Michi and Patrick to create a highly efficient, regenerative solution that would protect the harvest, lower costs and make the farm more resilient to climate change. Facing the common agricultural constraints of limited land, time and resources, the collaboration focused on maximizing productivity and protecting vulnerable crops like zucchini and lettuce against extreme weather events such as droughts and storms. To achieve this, the team took the farm’s abundant supply of manure with biochar to produce a high-quality soil amendment that supports soil health, humus formation and climate resilience. The tech-driven method strengthens soil health, speeds up humus formation and protects against extreme temperatures−proving that circular practices can turn farm waste into a powerful tool for reliable, high-yield food production.
Feasibility study and booster production in Iran
betterSoil conducted a 1.5-year feasibility study in Kerman, Iran, to evaluate a sustainable business model for producing betterSoil Booster, a natural soil amendment combining biochar and compost. Launched in early 2023, the project involved establishing a demonstration production site, building partnerships with local communities, sourcing biological waste and producing 10 tonnes of biochar-enriched compost. By transforming locally available organic waste into valuable soil resources, the initiative demonstrated the potential of a circular economy approach to address soil degradation and improve agricultural sustainability.
The biochar-enriched compost is designed to improve soil structure, nutrient retention, microbial activity and humus formation. Through soil consulting and sustainable farming practices, betterSoil also supports farmers and gardeners in tackling challenges such as soil salinity and water scarcity. The project demonstrates how converting organic waste into valuable soil amendments can promote a circular economy, soil restoration and carbon-resilient agriculture.
Biochar’s role in climate-proofing agriculture
Integrating biochar into standard farming practices provides substantial economic and environmental benefits and is the bedrock of climate-smart agriculture. By absorbing nutrients and slowly feeding them back to plant roots, biochar can reduce the required input of synthetic fertilizers by up to 50%, effectively mitigating high fertilizer costs.
Moreover, because of the complexity of its surface structure, biochar has a high capacity for absorption and strongly binds up toxic heavy metals and pesticides, drawing the harmful contaminants directly from the active ecosystem. It is exceptionally effective at immobilizing metals such as lead, cadmium, copper, zinc and nickel, while chemically reducing highly toxic hexavalent chromium into less mobile forms. This target extraction lowers the bioavailability of these toxins, preventing crops from absorbing them.
To combat intense irrigation demands, biochar binds and holds moisture deep within the root zone, which significantly lowers frequent irrigation costs while saving water, labour and electricity.
The future of soil restoration
Industrialized farmlands are trapped in a cycle of chemical dependency, but biochar offers a permanent exit strategy by fundamentally altering the soil’s physical architecture. Rather than acting as a temporary fertilizer that vanishes by the next harvest, this highly stable carbon matrix embeds itself in the ground for centuries. This longevity allows global agricultural soils to serve as dual-purpose engines: they reliably produce food while functioning as massive, subterranean carbon sink.
For betterSoil, biochar represents an opportunity to contribute to a more sustainable future by supporting healthier soils and responsible agricultural practices. By integrating biochar with other soil management strategies, the broader goal is to restore soil functionality, enhance agricultural resilience and promote a healthier environment for future generations.