SUMMARY The common methods of counting Azotobacter spp. in soil, colony counts and MPN, were compared using cell suspensions of densities determined by direct microscopic counts. A highly significant positive correlation was found between the surface‐plate, MPN and total cell counts, but the MPN estimations approximated total cell counts much more closely. Inclusion of 1‐1.5 g of agar/l of the liquid medium enhanced multiplication of azotobacters and facilitated the recording of growth in MPN estimations.
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Abd‐el‐Malek et al. (1968) studied this question.
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