OCCURRENCE OF NITROGEN FIXING AEROBIC BACTERIA AND AZOTOBACTER SPP. IN A FRESHWATER LAKE AND A POND AT MUMBAI
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Authors
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P K PANDEY
Central Institute of Fisheries Education, Fisheries University Road, Versova, Mumbai - 400 061, India
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NIRANJAN KUMAR
Central Institute of Fisheries Education, Fisheries University Road, Versova, Mumbai - 400 061, India
Abstract
Biological nitrogen fixation is an important process in nitrogen cycle in aquatic environment. In the present study, enumeration of nitrogen-fixing bacteria and effect of physico-chemical parameters of water and soil from Powai lake and Aarey fishpond, Mumbai, on their distribution has been studied. Five species of nitrogen-fixing Azotobacter (Azotobacter chroococcum, A. vinelandii, A. beijerinckii, A. nigricans and A. armeniacus) were characterized from water and soil. Higher number of nitrogen-fixing Azotobacter population could be observed in soil than in water. The nitrogen-fixing capacity of A. chroococcum, isolated from soil was higher than the nitrogen-fixing capacity of A. vinelandii and A. nigricans isolated from water.
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