1914] Lipman-Burgess : Ammonification in Soils by Pure Cultures 



14c 



comparisons between the different series made only where per- 

 missible. The data, moreover, are presented so that the dupli- 

 cate determinations which were carried out in all cases may be 

 compared. The averages of duplicate determinations, however, 

 are also given as well as the percentages of nitrogen in the 

 organic matter which was transformed to ammonia. 



Three different California soils were tested with each one of 

 the ammonifiable materials. The soils were a sandy soil from 

 Anaheim, a clay loam from Davis, and a black clay-adobe soil 

 from Berkeley. The mechanical and chemical analyses of these 

 soils are given in Tables I and II which follow. 



