Hanudin, E., Purwanto, B. H., & Destri, E. (2023). Accumulation Levels of Available Cu and Cu Absorption in Corn in Ultisolss and Alfisolss After the Addition of Fly Ash and Organic Materials . Jurnal Lahan Suboptimal : Journal of Suboptimal Lands, 12(1), 11–26. https://doi.org/10.36706/jlso.12.1.2023.617