17 



the Kjeldahl method in triplicate. This composite sample 

 which assayed 15.567% nitrogen was used in all ammonifica- 

 tion experiments. Each flask therefore contained 155.67 mg 

 of nitrogen. It will be observed that in soils number 49 and 

 61, over 80% of the nitrogen was evolved as ammonia. The 

 muck soil 49 being a little below the loam. A survey of the 

 table indicates that those soils which were especially active 

 in fixing nitrogen also converted into ammonia more than 

 70% of the available nitrogen. 



AMMONIFICATION * IMPURE CULTURES 

 TABLE IV 



