Nwigbo, O.E. et al. 2025. Optimizing Agricultural Drying Technologies: A Systematic Review of Charcoal, Gas, and Hybrid Kilns for Sustainable Food Preservation. Journal of Sustainable Engineering & Renewable Energy. 1, 1 (Jun. 2025), 37–51. DOI:https://doi.org/10.54536/jsere.v1i1.5038.