EFFECTIVENESS OF NPK 15-15-15 FERTILIZER COMBINED WITH EGG SHELL FLOUR ON THE GROWTH OF OIL PALM (ELAEIS GUINEENSIS JACQ.) SEEDLINGS: EFEKTIVITAS PUPUK NPK 15-15-15 YANG DIKOMBINASIKAN DENGAN TEPUNG CANGKANG TELUR TERHADAP PERTUMBUHAN BIBIT KELAPA SAWIT (Elaeis Guineensis Jacq.). ROCE [Internet]. 2026 Jan. 31 [cited 2026 Feb. 5];3(1). Available from: https://jurnal.rocewisdomaceh.com/index.php/roce/article/view/173