SOILS AND FERTILIZERS 



experiment with cow manure, conducted at the same 

 time, showed the following losses : 



When mixed cow and horse manure was compacted 

 and " placed in a galvanized iron pan with a perforated 

 bottom " for six months, the losses were as follows : 



197. Losses by Fermentation. When rapid fermen- 

 tation takes place in manure, appreciable losses of 

 nitrogen may occur. When the manure is well com- 

 pacted and the pile is so constructed as to prevent rapid 

 circulation of air through it, losses are reduced to the 

 minimum. Experiments show that when leaching is 

 prevented, the loss of nitrogen by fermentation of mixed 



