Shintarika, Feni, ,Sudradjat, and ,Supijatno. “Optimasi Dosis Pupuk Nitrogen Dan Fosfor Pada Tanaman Kelapa Sawit (Elaeis Guineensis Jacq.) Belum Menghasilkan Umur Satu Tahun”. Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy) 43, no. 3 (February 23, 2016): 250-256. Accessed March 29, 2024. https://jurnal.ipb.ac.id/index.php/jurnalagronomi/article/view/11252.