Afrillah, Muhammad, Chairani Hanum, and Abdul Rauf. “Efficiency Use of Nitrogen In Several Palm Oil Varieties With Treatment of Nitrogen Fertilizer Levels In Main Nursery”. Jurnal Online Pertanian Tropik 5, no. 3 (1): 428- 433. Accessed November 22, 2024. https://talenta.usu.ac.id/jpt/article/view/3116.