Ichriani GI, Sulistiyanto Y, Chotimah HENC. The use of ash and biochar derived oil palm bunch and coal fly ash for improvement of nutrient availability in peat soil of Central Kalimantan. J. Degrade. Min. Land Manage. [Internet]. 2021 Apr. 1 [cited 2025 May 12];8(3):2703-8. Available from: https://jdmlm.ub.ac.id/index.php/jdmlm/article/view/817