National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
The present investigation was carried out to assess the efficiency as well as effect of bio inoculation of free living N2 fixing bacterial strain (Azotobacter vinelandii strain SRIAz3) with N sources on enhancement of microbial properties of soil. A. vinelandii strain SRIAz3 was isolated from SRI Field (Central Farm, OUAT, Bhubaneswar) with optimum nitrogenase activity [121.09 N2-ase activity (nmole C2H4 mg-1 bacteria-1 h-1)]. Azotobacter inoculated plots significantly influenced the microbial parameters. In Azotobacter innoculated plot with 75% nitrogen source total heterotrophic bacteria, Azotobacter population, soil microbial biomass carbon, dehydrogenase, urease and phosphatase activity were enhanced by 40, 160, 80, 240, 80, 210 and 250 percent respectively over uninoculated plots. Higher Azotobacter population resulted in increased soil enzymatic (dehydrogenase, urease and phosphatase) activities and microbial biomass carbon. Use of Azotobacter vinelandii strain SRIAz3 isolated from SRI Field as biofertilizer significantly influenced soil microbial biomass and enzymatic activity, which could consequently enhance the rice yield and nutrient (N, P and K) uptake.
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