Sucrose-ammonium nitrate medium behaves like a true nitrate medium in that pH after an initial lowering rises towards neutralityunlike other ammonium salts. After the initial utilization of ammonia nitrogen, ammonia nitrogen concentration remains apparentlysteady for any particular level (sucrose) and hence Fusaria appear to utilise nitrate nitrogen preferentially. It is quiteprobable that there is a steady state between the production of ammoniacal nitrogen and the utilization of the same by thefungus. The rate of growth varies with the concentration of carbohydrate with an optimum C/N ratio for maximum growth. Therate of sucrose depletion and the rate of nitrogen accumulation of the mat follow an exponential law with both fungi. Presenceof nitrogen compounds in the filtrate (other than ammonia nitrogen and nitrate nitrogen) is minimum at the optimum concentrationlevel III (sucrose).

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sucrose presenceof nitrate medium ammoniacal nitrogen

S. Natarajan,.Carbon nitrogen metabolism of soil fungi—II. 44 (5),300-310.

S. Natarajan,"Carbon nitrogen metabolism of soil fungi—II" 44

S. Natarajan,"Carbon nitrogen metabolism of soil fungi—II"