FARM MANURES 



599 



taneously, and the loss from one source is dependent, to 

 a certain extent, on the other. It is only the nitrogen, 

 however, that may be lost by both fermentation and 

 leaching, the minerals being wasted only through the 

 latter avenue. A few figures regarding the losses to 

 manures when exposed to atmospheric conditions may 

 not be amiss at this point : — 



Losses from Manure through Leaching and 

 Fermentation 



It seems evident that when manure is exposed to at- 

 mospheric agencies, even under the best conditions, the 

 losses of nitrogen, phosphoric acid, and potash will be 

 on the average 45, 30, and 50 per cent, respectively. 



1 Roberts, I. P., and Wing, H. H. On the Deterioration 

 of Farmyard Manure by Leaching and Fermentation. Cornell 

 Univ. Agr. Exp. Sta., Bui. 13. 1889. 



2 Schutt, M. A. Barnyard Manure. Canadian Dept. Agr., 

 Centr. Exp. Farms, Bui. 31. 1898. 



3 Thorne, C. E. Farm Manures, p. 146. New York. 1914. 



4 Thorne, C. E., and others. The Maintenance of Fertility. 

 Ohio Agr. Exp. Sta., Bui. 183. 1907. 



