Nakhalin Phounsavath, Vannasinh Souvannasouk, Khamphisay Khammingsavath, Phoutsavath Phanthavong, Chantiem Silalai, Bualaphanh Mingkhuan, Odeth Sihavong and Salongxay Fongsamouth 2025. Circular bioeconomy valorization of coffee bark residues: Soil chemical transformation and yield enhancement in highland arabica coffee systems. Maejo International Journal of Energy and Environmental Communication. 7, 2 (Jun. 2025), 19–26. DOI:https://doi.org/10.54279/mijeec.v7i2.261857.