|PRINT ISSN : 2319-7692
Online ISSN : 2319-7706
Issues : 12 per year
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Index Copernicus ICV 2015: 85.95
NAAS RATING 2017: 5.38
Terai Zone of West Bengal is considered as a fragile ecological region because of high rainfall and prolongs winter. Plants cannot derive nutrients effectively from its organic source because of slow mineralization. Soils are acidic and light textured. High rainfall coupled with low pH lead to deficiency of several macro and micro-nutrients and at the same time toxicity of some other elements. A significant amount of applied chemical fertilizers is lost and find its way to pollute environment because of high rainfall. Natural resource management specially with biological nitrogen fixating microorganisms may be a good option for this zone. In the present investigation putative Azotobacter species were isolated from soils collected from Cooch Behar and Jalpaiguri districts of West Bengal. Isolate Az-12 was found to have fixed maximum amount of nitrogen (12.66 mg) at the cost of one gram of sugar consumed. It is revealed from the results that among the isolates, Az-3, Az-5, Az-12, Az-14 and Az-19 are ovoid to rod shaped. While the shape was rod with rounded end in isolates of Az-8, Az-11, Az-16 and Az-20. The size of the isolates varied widely. Thus the smallest size was found in Az-8 (2.2-3.5 x 1.2-1.8 µm) while the biggest size was found in isolates of Az-14 (3.0-3.2 x 2.0-2.2 µm).