Abstract
ABSTRACT Certain microorganisms fix atmospheric nitrogen in the root nodule of trees by establishing a symbiotic relationship. Rhizobium usually infects legume trees for nodulation while Frankia is an actinomycete, which is known for actinorhizal symbiosis with nonlegumes. However, Azospirillium is an associative symbiotic nitrogen-fixing organism. Vesicular arbuscular mycorrhizal (VAM) fungi help plants absorb phosphorous. These four microorganisms were examined in the present study. An experiment was conducted by inoculating Frankia, Rhizobium, and Azospirillum either singly or in combination with VAM to Casuarina equisetifolia, Acacia nilotica and Eucalyptus tereticornis. The inoculation resulted in high biomass built up over control. Casuarina equisetifolia and Acacia nilotica developed more nodules with higher nodule dry mass and high nodule nitrogenase activity compared to control. From the result it is important to note that the dual inoculation namely Frankia + VAM, Rhizobium + VAM, and Azosprillum + VAM showed higher productivity than single inoculation in all the above three tree species.
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