FAEM MANURE 



519 



m^tt£:r 



/o% 



^£'m///£D DY/^N/MAL 



Lost //v H/^tvOL/Ns 



/=IDD£D TO TH^SO/L, 



Fig. 62. — Diagram showing the proportion of the important constituents 

 of the food retained by the animal, lost in the handling and the 

 storage of the manure and applied to the soil under ordinary 

 conditions. 



were not important, a self-snstaining system of agriculture 

 could not be established by the use of farm manure alone, as 

 organic matter is the only constituent that would be added 

 to the soil in amounts that approach the magnitude pf the 



loss.^ 



*Fippin, E. O., Live Stock and the Maintenance of Organic Mat- 

 ter %n the Soil; Jour. Amer. Soc. Agron., Vol. 9, No. 3, pp. 97-105, 

 Mar. 1917. 



