| Treatment | 
        N-Sources* | 
        Glycerol 
          (ml/l) | 
       
      
        | Inorganic N- sources (g/l) | 
        Organic N- sources (g/l) | 
       
      
        | (NH4)2SO4 | 
        NaNO3 | 
        NH4Cl | 
        Beef extract | 
        Peptone | 
        Yeast Extract | 
       
      
        | 1 | 
        22.6 | 
        - | 
        - | 
        - | 
        - | 
        - | 
        21.50 | 
       
      
        | 2 | 
        - | 
        14.6 | 
        - | 
        - | 
        - | 
        - | 
        21.50 | 
       
      
        | 3 | 
        - | 
        - | 
        9.2 | 
        - | 
        - | 
        - | 
        21.50 | 
       
      
        | 4 | 
        - | 
        - | 
        - | 
        19.4 | 
        - | 
        - | 
        12.82 | 
       
      
        | 5 | 
        - | 
        - | 
        - | 
        - | 
        15 | 
        - | 
         9.76 | 
       
      
        | 6 | 
        - | 
        - | 
        - | 
        - | 
        - | 
        24.5 | 
          8.41 | 
       
      
        | 7 | 
        - | 
        - | 
        - | 
        7.5 | 
        9.2 | 
        - | 
        10.95 | 
       
      
        | 8 | 
        - | 
        - | 
        - | 
        7.5 | 
        - | 
        15 | 
        10.12 | 
       
      
        | 9 | 
        - | 
        - | 
        - | 
        - | 
        5.8 | 
        15 | 
          8.95 | 
       
      
        | Control | 
        - | 
        - | 
        - | 
        5 | 
        5 | 
        10 | 
            10.00 | 
       
     
    *At C/N ratio of 3.51/1 |