AFRIYANI, A.; MARTINUS, A.; FRATIWI, I. Utilization of coal burning waste fly ash as a soil improving material in red yellow podsolic soil. Jurnal Lahan Suboptimal : Journal of Suboptimal Lands, [S. l.], v. 14, n. 2, p. 210–215, 2025. DOI: 10.36706/jlso.14.2.2025.727. Disponível em: https://jlsuboptimal.unsri.ac.id/index.php/jlso/article/view/727. Acesso em: 24 oct. 2025.