ABSTRACT The aim of the research was to determine the effect of the interaction between damping the canopy and applying potassium fertilizer on the production of oil palm (Elaeis guineensis Jacq.) plants at close spacing. This research was conducted in Petapahan Village, Tapung District, Kampar Regency from December 2021 to June 2022 in the form of a randomized block design trial with two trea…