Microbial fixation of nitrogen in presence of lanthanum sulphate with sodium molybdate

Summary The effect of lanthanum sulphate together with 100 µM of sodium molybdate show that there is considerable increase in nitrogen fixation and carbon consumption in the culture medium of nitrogen-fixing Azotobacter species A 1 and A 2 , isolated from Allahabad soil. But these combinations decrease the nitrogen fixation and carbon consumption in case of another species, Azotobacter A 3 , of the same soil.