Sinaga, D.P., Dwi Purbajanti, E. and Adi Kristanto, B. 2020. The Effect of Magnesium, Boron, and NPK Fertilizer on the Growth of Pre-Nursery Oil Palm (Elaeis guineensis Jacq). Jurnal Online Pertanian Tropik. 7, 2 (Dec. 2020), 262–271. DOI:https://doi.org/10.32734/jopt.v7i2.4876.