Abstract
Forests of Indian subcontinent are one of the biodiversity hot spots of the world. They are the second-largest inland use next to agriculture, yet possess a high degree of endemism. Plantation forestry in India was initiated mainly for the production of industrial raw materials as well as fuelwood and fodder from exotic species. The increase in demand for industrial raw material has spurred the rise in plantations of fast-growing native tree species. Neolamarckia cadamba (Roxb.) Bosser is a native tree species whose wood has been largely used in the pulpwood and pencil industry for making boards, plywood, packing cases, tea-boxes, carving and turnery articles. Supplementation of these native trees with effective bio inoculants will improve and maintain the soil fertility and sustainability in the natural soil ecosystem besides providing economic benefits. In the present study, the diversity of PGPR was assessed in the rhizosphere of N. cadamba plantations in Narasipuram, Coimbatore, Tamil Nadu. 33 PGPR isolates from N. cadamba rhizosphere were isolated viz. four species of Azotobacter, three species of Azospirillum and six different PSB species. The isolates were studied for their plant growth promotional abilities such as Indole Acetic Acid (IAA) production and phosphate solubilization.
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