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 : Jurnal Pertanian Terapan, [S. l.], v. 3, n. 1, 2026. DOI: 10.71275/roce.v3i1.173. Disponível em: https://jurnal.rocewisdomaceh.com/index.php/roce/article/view/173.. Acesso em: 5 feb. 2026.