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Microbial diversity was assessed in the soils of non-polluted rice fields of Central Rice Research Institute and Choudwar, and textile effluent contaminated (about 30 years) rice fields of Choudwar about 4 years after cessation of pollution. The soils contained 0.62-1.01 % organic C and 0.07-0.12 % total N, and measured 6.18-8.24 pH and 0.6-2.68 mS/cm Eh which were more in the polluted Choudwar soil. The microbial populations (×10(6) cfu/g soil) in the soils were: heterotrophs 1.21-10.9, spore formers 0.9-2.43, Gram (-)ve bacteria 4.11-8.0, nitrifiers 0.72-1.5, denitrifiers 0.72-2.43, phosphate solubilizers 0.14-0.9, asymbiotic nitrogen fixers 0.34-0.59, actinomycetes 0.07-0.11, fungi 0-0.5 and Bacillus thuringiensis (Bt) 0.4-0.61 which predominated in the polluted soil of Choudwar. The fungi were scarce in the polluted rice fields. The Bt isolates belonged to three motile and one non-motile group. Two motile Bt isolates were phenotyped as Bt subsp. sotto and israelensis, whereas, the non-motile isolate was Bt subsp. wahuensis. All Bt isolates produced extracellular protease, lipase and amylase enzymes. The microbial guilds had positive correlation among themselves, as well as, with soil physico-chemical characters but the fungi had negative relation and the nitrogen fixers were unrelated with the biotic and abiotic components.

Microbial Dynamics and Diversity of Bacillus thuringiensis in Textile Effluent Polluted and Non-polluted Rice Field Soils of Orissa, India