To detennine whether there are bacteria in the western soil management (WSM) collection at Murdoch University capable of forming functional nodules on A. mangium, a glasshouse trial was undertaken with six isolates. These cultures had been isolated from nodules on roots of A. acuminate and were associated with a positive effect on growth. The results showed that strain WSM 2248 also had a positive effected on growth of A. mangiwn, it increased shoot and root dried weight over negative control ones by 524 percent and 234 percent, respectively. However, there were a few of chloric seedlings still present. This strain, therefore, might be not the most effective one, and could easily be replaced by 1) indigenous rhizobia in plantations or by 2) co-inoculation with ectomycorrhizal fungi for optimal capability of fixing N2.