Biochar as a Soil Amendment in Rice Production: Current Status, Debates, and Opportunities for Enhancing Rice Farming in Ghana
DOI:
https://doi.org/10.65150/EP-jnsrr/V1E6/2025-02Keywords:
Biochar, soil fertility, nutrient management, climate change adaptation, pyrolysis, carbon sequestrationAbstract
Rice (Oryza sativa L.) production in Ghana confronts multifaceted challenges, including progressive soil fertility decline, increasingly erratic rainfall patterns, suboptimal water management infrastructure, and persistent dependence on costly imported fertilizers. Biochar—a carbon-rich, porous material produced through pyrolysis of organic biomass under oxygen-limited conditions—has emerged as a promising sustainable soil amendment with demonstrated potential to address these interconnected constraints. This comprehensive review synthesizes global research on biochar applications in rice cultivation systems, with particular emphasis on mechanistic understanding, agronomic outcomes, and contextual relevance to Ghanaian agricultural systems. Recent meta-analyses encompassing over 150 field trials demonstrate that biochar consistently improves soil organic carbon (SOC) content by 15-50%, cation exchange capacity (CEC) by 20-40%, water retention by 10-30%, and nutrient use efficiency by 15-25% across diverse paddy environments (Jeffery et al., 2017; Liu et al., 2013; Ye et al., 2020; Yuan et al., 2024). Tropical field studies report yield increases ranging from 10% to 30% when biochar is synergistically integrated with mineral fertilizers or organic amendments, alongside methane emission reductions of 15-30% and substantial decreases in nutrient leaching (Somboon et al., 2024; Park et al., 2023; Zhang et al., 2023). However, agronomic outcomes exhibit substantial variability contingent upon feedstock type, pyrolysis conditions (temperature, residence time), application rates, soil physicochemical properties, and climatic factors (Lehmann & Joseph, 2015; He et al., 2023; Qi et al., 2024). Ghana-specific research remains critically limited, with only preliminary upland rice trials and scattered greenhouse studies documented (MacCarthy et al., 2020; Frimpong-Manso et al., 2022; Aboagye et al., 2022). Critical knowledge gaps include long-term field performance under Ghanaian pedoclimatic conditions, economic feasibility for resource-constrained smallholder farmers, optimal integration protocols for locally available feedstocks, and policy frameworks to facilitate adoption. This review identifies priority research imperatives: multi-season pilot trials across Ghana's distinct agro-ecological zones, rigorous cost-benefit analyses of decentralized biochar production systems, synergistic interactions with microbial inoculants and organic amendments, environmental life cycle assessments, and evidence-based policy frameworks to support sustainable adoption. Biochar offers a viable pathway to enhance rice productivity, improve resource-use efficiency, and contribute meaningfully to climate change mitigation in Ghana, provided that implementation is guided by locally calibrated research and integrated soil fertility management strategies embedded within broader agroecological frameworks.
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