FARM MANURES 



225 



been demonstrated by a number of experiments, from which 

 the following have been selected. 



Table 47. — Effect of Food on Composition of Animal and 

 Poultry Manure 



283. Commercial evaluation of manures. — As a means 

 of comparing manures, they may be evaluated in a manner 

 similar to that used with commercial fertilizers. This, 

 however, fails to place any value on the organic matter, 

 which is undoubtedly of much benefit to the soil. In the 

 following table are given the values of manures produced 

 by different animals based, in part, on the composition given 

 in Table 45 when the nitrogen is considered to be worth ten 

 cents a pound, the phosphoric acid two and one-half cents 

 and the potash four cents. 



Table 48. — Value of Excreta Produced by Several 

 Farm Animals « 



