Is there a simple method do determine soil nitrifier and denitrifier populations using the most probably numbers (MPN) technique?

I would like to find a simple method other than the one outlined in "Methods in Soil Biology" by F. Schinner, R. Oehlinger, E. Kandeler, and R. Margesin to determine soil nitrifier and denitrifier...

22 May 2015 4,881 3 View