This study was aimed to evaluate the growth among different treatment combinations of NAA and explant size to get the best treatment combination for initiation of callus from young leaves of oil palm (Elaeis Guineensis Jacq.). The research was conducted at the Tissue Culture Laboratory, Faculty of Agriculture, Sriwijaya University, Bukit Lama, Ilir Barat I District, Palembang City, South Sumatr…