248 



Feeds and Feeding. 



The source of the fertility in manures is well illustrated by th< 

 following table from Hebert: 1 



Location of nitrogen, phosphoric acid, and potash in excrement. 



We learn that the urine of the horse contains 1.52 per ct. of ni- 

 trogen and the solid excrement 0.55 per ct., or only one-third as 

 much. The reverse holds true for the phosphoric acid, for only a 

 trace of this appears in the urine and nearly all in the solid excre- 

 ment. Of the potash, 0.9 per ct. is found in the urine and only 0.1 

 per ct. in the solid excrement. 



The fertilizing constituents which pass off with the solid excre- 

 ment are largely insoluble and to this extent not directly available 

 to plants when applied in manures. On the other hand, the con- 

 stituents in urine are in soluble form and directly available to the 

 plant. 



384. Fertilizing matter produced yearly. According to Roberts, 2 

 the quantity and value of manure from farm animals maintained 

 under good conditions is substantially as follows: 



Amount and value of fertilizing constituents voided yearly by farm 



animals. 



\ The last column of the table, showing the commercial value of the 

 manure of farm animals, is obtained by giving to the several fer- 

 tilizing constituents the price per pound they at present command 

 in commercial fertilizers, viz. nitrogen 18 cents, phosphoric acid 5 

 cents, and potash 5 cents per Ib. 



1 Expt. Sta, Kecord, Vol. 5 ; also Fertility of the Land, Koberts, p. 180. 



2 The Fertility of the Land. 



