YOSEPHINE, I.O., Effendi, Z. and Fitriana, D. 2025. Study of the Productivity of Oil Palm Plants (Elaeis guineensis Jacq.) on Different Topographies. Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering). 14, 4 (Jul. 2025), 1349–1358. DOI:https://doi.org/10.23960/jtepl.v14i4.1349-1358.