Abstract
Surface soils and subsurface soils were collected from three different locations, viz. Iswaripur, Mouriganga and Companichar of Sagar Island, 24 Parganas (South). Surface soils recorded higher ECe values and also recorded higher organic carbon than subsurface soils. Diazotrophic bacterial population and dinitrogen fixation were higher in surface soils. The highest population (6.87 log colony-forming unit) and nitrogen-fixing power (5.187 mg nitrogen fixed 50 mL−1 culture media) were observed in surface soil of Mouriganga (88° 10′ 01.6″E and 21° 49′ 03.8″N). Eight pure diazotrophic bacteria were isolated and characterized from these three locations. Most of the isolated organisms were Gram (+ve) and few were Gram (−ve). Acid production test was positive for all the organisms during different sugar utilization. All the isolates could hydrolyze starch and lactose. The organisms were catalase positive. Among the eight isolated bacteria, Sagar6 found to be the best depending on its nitrogen-fixing ability, which was isolated from subsurface soil of Mouriganga (88° 10′ 01.6″E and 21° 49′ 03.8″N). This isolate could fix up to 4.09 mg nitrogen fixed 50 mL−1 culture media. Sagar6 isolate promised to be a candidate for adoption in crop production in soils of Sagar Island.
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Das, A., Srivastava, R., Patil, V., Tripathi, S. (2018). Studies on the Non-symbiotic Diazotrophic Bacterial Population and Efficiency of Nitrogen Fixation in Coastal Saline Soils from Sagar Island, West Bengal. In: Singh, V., Yadav, S., Yadava, R. (eds) Water Quality Management. Water Science and Technology Library, vol 79. Springer, Singapore. https://doi.org/10.1007/978-981-10-5795-3_25
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