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An experiment was conducted in undrained poly bags under glasshouse conditions to quantify the N fixing capacity (N isotope dilution method) of plant growth promoting rhizobacteria (Azospirillum and 2 15 Bacillus spp.) in association with oil palm seedlings. Effects of inoculation on nutrient uptake and plant growth promotion will also be observed. The experiment was arranged in a randomized complete block design with five replications and harvested at 390 days after planting. The treatments involved were: 1) killed Azospirillum brasilense (Sp 7), 2) killed Sp 7;+ inorganic-N, 3) Sp 7, 4) A. lipoferum (CCM 3863), 5) locally isolated i rhizobacteria UPMB 10, and 6) UPMB 13 inoculation. Results showed that inoculation of the rhizobacteria could contribute up to 20-50% of the total nitrogen requirement of the host plant through N fixation process. Besides 2 that, the inoculation process had also stimulated accumulation of nutrient and plant growth (tops and roots) comparable to the control with full inorganic nitrogen (N) fertilization after 390 days of growth. i