Rosalina, F., Tjahyandari, D., & Darmawan, D. (2018). The Potential Of Nickel Slag with Humic Substance Addition as Ameliorating Materials on Gajrug Red-Yellow Podzolic. SAINS TANAH - Journal of Soil Science and Agroclimatology, 15(1), 61-68. https://doi.org/10.15608/stjssa.v15i1.17814