In a detailed review published in the journal Biochar, authors Abdul Waheed, Qiao Xu, Dong Cui, Murad Muhammad, Hailiang Xu, Aishajiang Aili, Amannisa Kuerban, and Sajjad Ali examine the transformative potential of biochar for dryland restoration. Arid and semi-arid regions cover nearly 40 percent of the global land area and are increasingly vulnerable to desertification and water scarcity. These fragile ecosystems often suffer from extremely low soil organic matter, which destabilizes microbial habitats and limits agricultural productivity. The researchers argue that biochar offers a climate-smart strategy to mitigate these constraints by improving soil structure and boosting water use efficiency. By converting organic biomassBiomass is a complex biological organic or non-organic solid product derived from living or recently living organism and available naturally. Various types of wastes such as animal manure, waste paper, sludge and many industrial wastes are also treated as biomass because like natural biomass these More into a stable, carbon-rich solid, land managers can restore degraded soils while simultaneously sequestering atmospheric carbon for decades or even centuries.

The findings highlight that biochar provides a significant physical and chemical boost to nutrient-poor dryland soils. Its highly porous structure and large surface area allow it to enhance soil water holding capacityWater holding capacity is the amount of water that soil can retain. Biochar can significantly increase the water holding capacity of soil, improving its ability to withstand drought conditions and support plant growth.   More by 15 to 35 percent. This is particularly crucial in sandy soils where water typically drains too quickly for crops to use effectively. Additionally, biochar increases the cation exchange capacity of the soil by 30 to 50 percent, which helps retain vital nutrients like ammonium and potassium that would otherwise leach away. Empirical evidence synthesized in the study shows that in some arid environments, biochar application has led to a 30 to 50 percent increase in the biomass of grass species and boosted crop yields by up to 50 percent for staple grains like millet and sorghum.

Beyond crop productivity, the study emphasizes biochar’s role as a powerful tool for environmental stabilization. In desertified areas, wind erosion is a major threat that removes fertile topsoil. Biochar contributes to soil cohesion and aggregation, reducing the risk of wind erosion by up to 30 percent. This stabilizes the land surface and maintains soil health even under harsh climatic conditions. Furthermore, the stable aromatic structure of biochar allows it to sequester up to 80 percent of the initial carbon from its original organic source. This makes it a multifunctional agent that addresses both local land degradation and the global need for greenhouse gas mitigation, with an estimated global mitigation potential of approximately 1.8 gigatons of carbon dioxide equivalent per year.

The research also explores innovative application methods designed to overcome traditional economic barriers. One such advancement is the use of precision agriculture, where drones and sensors target specific degraded zones, potentially reducing application rates by 30 percent without losing moisture benefits. In sun-rich arid regions, coupling biochar production with solar thermal energy can eliminate external fossil fuel costs and reduce greenhouse gas emissions by more than 50 percent compared to traditional diesel-based systems. Other novel techniques include biochar-infused irrigation, which has been shown to improve maize water productivity by 18 percent by delivering finely milled biochar directly to the plant’s root zone.

The authors note that while the benefits are substantial, success is highly dependent on matching the biochar’s properties to the specific soil texture and climate. For example, large-pore biochars might bypass the natural capillary action of coarse sandy soils, resulting in only a 2 percent moisture gain. Conversely, wood-based or manure-based biochars with balanced mineral content are highly effective at reducing sodium levels in salt-affected soils. The review concludes that by integrating biochar into circular economies—where it is used for waste valorization and precision nutrient recycling—industrial-scale deployment becomes much more economically viable. Linking microbial-scale insights with advanced digital simulations allows for a next-generation approach to sustainable land management in a water-constrained world.

Source: Waheed, A., Xu, Q., Cui, D., Muhammad, M., Xu, H., Aili, A., Kuerban, A., & Ali, S. (2026). Biochar as a climate-smart strategy for restoring dryland soils and mitigating desertification. Biochar, 8(59).