160 AMERICAN MANURES. 



Potash is sometimes used in manures as a 

 crude sulphate of potash, this is generally very 

 impure, and contains only 16 to 17 per cent, of 

 potash, and can be purchased in bags for $30 

 per ton ; this would make the pure potash about 

 8 cents per pound. 



Potash salts can be purchased in New York 

 for $70 per ton, guaranteed to contain 80 per 

 cent, of muriate of potash, making the priceof pure 

 potash nearly the same as above ; consequently 

 we shall estimate the potash as contained in 

 fertilizers at 8 cents per pound, which price is 

 evidently remunerative to the manufacturers. 



So that the prices we have adopted to estimate 

 the value of the following substances are for, 



Insoluble Phosphoric Acid as in bones 4J cents. 



Soluble Phosphoric " " .... 12 " 



Actual Ammonia 25 u 



Nitrogen in organic matter 15 " 



Potash. 8 " 



The above prices are for the strictly pure 

 anhydrous substances; but as many manufac- 

 turers in giving analyses of their manures give 

 the following combinations, which are calculated 

 to deceive the farmer, by producing an im- 

 pression that there is a larger amount of the 

 different substances present, the following Table 

 \vill be useful in showing the relative value of 

 these combinations with the above prices : 



