Azotobacter is well known plant growth promoting rhizobateria that fix diniitrogen (N2), and produce phytohormones and exopolysaccharides (EPS). The objective of this pot experiment was to evaluate the effect of Azotobacter liquid inoculant as well as its crude EPS on N2 fixing bacteria population, essential macronutrientsst uptake and yield of soybean cv. Anjasmoro grown in potted soil. The experiment was arranged in randomized block design with five replications. The combination treatments consisted of two doses of Azotobacter two doses of crude EPS and two doses of liquid inoculant of Azotobacter. All plants were also inoculated with Bradyrhizobium sp. isolated from the rhizosphere of said soybean. Results showed that liquid inoculant and crude EPS of Azotobacter enhanced total bacteria and Azotobacter population in the rhizosphere as well as root nodule number. The experiment verified that nitrogen and phosphate uptake by soybean shoots increased by both treatments, but there was no change in potassium uptake. Grain yield of plants inoculated with Azotobacter and crude EPS were higher than the control.
