Biochar and its role in soil fertility enhancement and carbon sequestration strategies

Abstract

Biochar, a carbon-rich byproduct derived from the pyrolysis of organic biomass under limited oxygen conditions, has emerged as a highly promising soil amendment in the context of sustainable agriculture and global climate change mitigation. Its unique physicochemical properties, including high porosity, large surface area, and enhanced cation exchange capacity, enable it to significantly improve soil health by ameliorating physical, chemical, and biological constraints. The incorporation of biochar into agricultural soils has been shown to enhance nutrient retention, water holding capacity, and microbial diversity, leading to improved crop productivity and resilience to environmental stresses. Furthermore, biochar plays a pivotal role in long-term carbon sequestration due to its chemical stability and resistance to microbial decomposition, offering a viable strategy for reducing atmospheric greenhouse gas concentrations. This review critically synthesizes existing literature on biochar production technologies, feedstock influences, and resultant biochar properties. It also examines biochar’s multifaceted impacts on soil fertility, nutrient dynamics, and microbial ecology, along with its capacity to mitigate climate change by functioning as a stable carbon sink. In addition, the paper discusses key challenges such as variability in biochar quality, economic feasibility, and potential ecological risks associated with large-scale application. Future directions emphasize the need for standardized production methods, field-based trials across diverse agroecosystems, and integration of biochar use within broader sustainable land management strategies.