Fernando Sitorus, Alberth, Heru Bagus Pulunggono, Syaiful Anwar, and Budi Nugroho. “Diagnosis of Macronutrients in Oil Palm (Elaeis Guineensis Jacq.) Using DOP and DRIS Methods”. Jurnal Penelitian Kelapa Sawit 32, no. 2 (August 13, 2024): 83-94. Accessed November 21, 2024. https://jurnalkelapasawit.iopri.org/index.php/jpks/article/view/245.