Purnomo, Budi, Novi Rahmawati Sutopo, and Yulia Nuraini. “Utilization of Indigenous Phosphate-Solubilizing Bacteria to Optimize the Use of Coal Fly Ash for Increasing Available-P in an Ultisol”. Journal of Degraded and Mining Lands Management 8, no. 4 (July 1, 2021): 2937–2946. Accessed March 27, 2025. https://jdmlm.ub.ac.id/index.php/jdmlm/article/view/920.