10.22376/ijpbs.2019.10.1.p1-12 Volume 4 Issue 2 2013 (April - June) In this study, the nitrogen fixing bacteria lessThan i greaterThan VIT SS 1-6 lessThan /i greaterThan were screened from the root nodules of Groundnut (Family: lessThan i greaterThan Fabaceae lessThan /i greaterThan , Species: lessThan i greaterThan Arachis hypogaea lessThan /i greaterThan ) collected from Vellore district were examined for their plant growth promoting properties. Of the six isolates obtained, five were fast growing and one was slow growing. The slow growing species lessThan i greaterThan VIT SS5 lessThan /i greaterThan was further examined for its nitrogen fixing, potassium and phosphorus solubilising capabilities to identify its level of efficiency over the traditionally used lessThan i greaterThan N-nitrogen P-phosphorus K-potassium fertilizer lessThan /i greaterThan . This particular strain was chosen because it was identified in most of the isolates. Tentative identification was done using biochemical tests and microscopic examination. The screened organism was tested for its enzyme production, utilization of carbohydrate sources, salt, pH and temperature tolerance and statistical analysis was performed. Further studies on preparation of liquid fertiliser will be done. SAI SHIVA SHANKAR V AND SUNEETHA V Plant growth promoting bacteria (PGPB), Biochemical tests, Statistical growth optimization, Enzyme assays and NPK-fertilizer. 795-802