Sulistiyani, D.P. et al. 2022. The Effect of Goat Biourin Liquid Fertilizer with Banana Hump Decomposer on Chemical Properties Ultisol. Jurnal Lahan Suboptimal : Journal of Suboptimal Lands. 11, 2 (Oct. 2022), 154–160. DOI:https://doi.org/10.36706/jlso.11.2.2022.561.