Sukarman S, Saidy AR, Rusmayadi G, et al. Effect of water deficit of Ultisols, Entisols, Spodosols, and Histosols on oil palm productivity in Central Kalimantan. Sains Tanah J. Soil Sci. Agroclimatology. 2022;19(2):180-191. doi:10.20961/stjssa.v19i2.65455