Kolambani, Frengky Umbu, and Widowati Widowati. “Changes in Chemical Properties of Three Soil Types After Application of Biochars and Organic Fertilizers for Two Years”. Journal of Degraded and Mining Lands Management 9, no. 4 (July 1, 2022): 3715–3724. Accessed September 7, 2024. https://www.jdmlm.ub.ac.id/index.php/jdmlm/article/view/1209.