TY - JOUR AU - Hossain, Md Mozammel AU - Akter, Salina AU - Hasan, Md Mahmudul AU - Hasan, Ashraful AU - Uddin, Kazi Rasel AU - Parvin, Afroza AU - Jahan, Iffat AU - Rahman, Nazibur AU - Rahman, SM Badier PY - 2016/06/19 Y2 - 2024/03/28 TI - Nitrogen fixing efficiency and physiological characteristics of Azospirillum isolates from the paddy fields of North Bengal JF - Jahangirnagar University Journal of Biological Sciences JA - Jahangirnagar Univ. J. Biol. Sci. VL - 3 IS - 1 SE - Original Research Articles DO - 10.3329/jujbs.v3i1.28277 UR - https://www.banglajol.info/index.php/JUJBS/article/view/28277 SP - 47-53 AB - <p>The microbial activity of ten selected <em>Azospirillum </em>isolates was measured in terms of the amount of CO<sub>2</sub> evolved by the isolates after incubation for 5 days which ranged from 6.88 to19.25 mg. Nitrogen fixing efficiency all of the isolates was determined by microkjeldhal method and the nitrogen fixing efficiency ranged from 10.03 to 13.11 mg N/g substrate. The growth of <em>Azospirillum </em>isolates was significant affected by different physiological factors such as pH, temperature and salinity. Most of the isolates showed optimum growth at pH 6.8, temperature 37°C and in the absence of NaCl. <em>Azospirillum </em>has the potential to be used as a substitute and or supplement of N-fertilizers. Further research is needed to estimate N-supplement potentials of biological nitrogen fixation (BNF) systems at the farm level.</p><p>Jahangirnagar University J. Biol. Sci. <strong>3</strong>(1): 47-53, 2014 (June)</p> ER -