Ardiyanto, Adhy, Kukuh Murtilaksono, Enni Dwi Wahjunie, and Atang Sutandi. “A Water Balance’s Effect on Oil Palm Productivity under Varying Soil Types: Case Study in Central and West Kalimantan”. Jurnal Penelitian Kelapa Sawit 29, no. 1 (April 20, 2021): 11-20. Accessed June 18, 2021. https://jurnalkelapasawit.iopri.org/index.php/jpks/article/view/125.