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A COMPARATIVE STUDY OF Azotobacter spp. FROM DIFFERENT SOIL SAMPLES (Pages : 16 - 19)

M. Z. ISLAM, D. I. SHARIF AND M. A. HOSSAIN

Azotobacter spp. were isolated from different soil samples and analyzed for number of Azotobacter per gram of soil, saline tolerant and heat resistant. The maximum number (CFU) of Azotobacter in legume crop field soil (sample No. 1) was 11x105 / gm of soil. The lowest number in grain crop field soil (Sample no. 3) was 3x105 / gm of soil. There was not any Azotobacter observed in river water sediment. To determine the prominence of Azotobacter in the soil sample other determinants such as pH and moisture. All isolate show maximum growth at 0% NaCl, only two isolate 1 and 4 show growth at 0.8 % NaCl. All isolate content was studied which showed maximum growth at 30ºC temperature but isolate 2, 5 and 6 showed optimum growth 20 ºC whereas isolate 1, 3 and 4 showed optimum growth at 40 ºC and no isolate survive at 50 ºC. The result revealed that legume crop field soil contained the high varieties of Azotobacter spp. in terms of temperature and salt tolerance, which became a promising source for further study.Download


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