Ali Fakhar and colleagues, in their recent BiocharBiochar is a carbon-rich material created from biomass decomposition in low-oxygen conditions. It has important applications in environmental remediation, soil improvement, agriculture, carbon sequestration, energy storage, and sustainable materials, promoting efficiency and reducing waste in various contexts while addressing climate change challenges. More journal review , explore the promise of modified biochar (MB) in improving soil health and sustainability. Biochar, a carbon-rich material from 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 pyrolysisPyrolysis is a thermochemical process that converts waste biomass into bio-char, bio-oil, and pyro-gas. It offers significant advantages in waste valorization, turning low-value materials into economically valuable resources. Its versatility allows for tailored products based on operational conditions, presenting itself as a cost-effective and efficient More, can be engineered to enhance its chemical and physical properties. This review highlights advancements in MB’s characteristics, analytical techniques, and its impact on soil applications.

Pristine biochar offers benefits like carbon sequestration, water retention, and soil enrichment, but its effectiveness varies across soil types. Modifying biochar enhances its surface area, porosityPorosity of biochar is a key factor in its effectiveness as a soil amendment and its ability to retain water and nutrients. Biochar’s porosity is influenced by feedstock type and pyrolysis temperature, and it plays a crucial role in microbial activity and overall soil health. Biochar More, alkalinity, and nutrient retention, making it a more tailored soil amendmentA soil amendment is any material added to the soil to enhance its physical or chemical properties, improving its suitability for plant growth. Biochar is considered a soil amendment as it can improve soil structure, water retention, nutrient availability, and microbial activity.   More. Techniques such as activation with minerals, acids, or engineered functional groups significantly improve biochar’s properties for specific agricultural uses. The review delves into the physicochemical properties of MB, including its cation exchange capacity (CEC), pHpH is a measure of how acidic or alkaline a substance is. A pH of 7 is neutral, while lower pH values indicate acidity and higher values indicate alkalinity. Biochars are normally alkaline and can influence soil pH, often increasing it, which can be beneficial More balance, and elemental composition. Advanced analytical techniques—such as scanning electron microscopy (SEM), X-ray diffraction (XRD), and Fourier-transform infrared spectroscopy (FTIR)—help assess MB’s structure and efficiency.

While MB improves soil aeration, water retention, and nutrient availability, challenges remain. Soil type, climate, and biochar’s chemical properties affect its performance. Over-modification can reduce pore space or increase nutrient adsorption, limiting bioavailability. Researchers are exploring optimal MB formulations to balance these effects.

MB holds great potential for regenerative agriculture, pollution remediation, and climate resilience. However, scaling production, standardizing modifications, and ensuring cost-effectiveness remain key hurdles. Future research will focus on optimizing MB for different soil conditions and crop needs.

Fakhar, A., Galgo, S. J. C., Canatoy, R. C., Rafique, M., Sarfraz, R., Farooque, A. A., & Khan, M. I. (2025). Advancing modified biochar for sustainable agriculture: A comprehensive review on characterization, analysis, and soil performance. Biochar, 7(8). https://doi.org/10.1007/s42773-024-00397-0