ABSTRACT This study aims to determine the influence of single factors and interactions of NPK fertilizer and fertilizer application time on the growth and production of untreated oil palm plants (Elaeis guineensis Jacq.). This research has been carried out at the Rimbo Panjang Agrotechnology Education Garden, Faculty of Agriculture, University of Riau, Jl. Raya Pekanbaru Bengkinang Km 21 Rim…