ABSTRACT Oil palm (Elaeis guineensis Jacq.) is a plant with high economic value because it is one of the producers of vegetable oil. Plant Growth Promoting Rhizobacteria (PGPR) are soil microorganisms that are beneficial for plants and live in the root zone or rhizosphere. The purpose of this study was to determine the effect of the interaction of Humic Acid and PGPR administration, as well as…