Sirait, Bilter, Bondar, Benito, Simatupang, Uli C., AND Manurung, Agnes Imelda. " EFFECTS OF UREA AND ORGANIC FERTILIZER TREATMENTS ON OIL PALM (ELAEIS GUINEENSIS JACQ.) SEEDLING GROWTH IN THE PRE-NURSERY" Jurnal Darma Agung [Online], Volume 33 Number 2 (14 April 2025)