So the value of a ton of fertilizer is based upon 

 the source or form of the nitrogen, phosphoric acid 

 and potash, and the quantity of each. 



COST OF NITROGEN. 



Nitrate of soda, 96% pure, 16% nitrogen, at $50 

 per ton. This yields 307 pounds of nitrogen, which, 

 at $50 per ton, equals 16. 3c. per pound or $3.24 per 

 unit of 20 pounds. 



Dried ground blood, analyzing 15% nitrogen, or 

 301 pounds at $50 per ton, equals 16. 6c. per pound, 

 or $3.32 per unit. From horse manure containing 

 .5% nitrogen, at $2 per ton, equals 20c. per pound, 

 to say nothing of the phosphoric acid and potash 

 contained. The New York Experiment Station gives 

 the price of nitrogen in nitrate as 15c. per pound, in 

 meat and blood as 16c. per pound, in bone and 

 tankage (ground) as 16c. per pound. 



COST OF PHOSPHORIC ACID. 



Steamed, ground bone (not acidulated) at $35 

 per ton, containing 25% phosphoric acid (500 

 pounds) equals 6c. per pound, less the value of 1% 

 nitrogen (20 pounds) contained in steamed bone at 

 16.4c. per pound would make the net cost of phos- 

 phoric acid about $1.10 per 20 pounds, or 5M>c. per 

 pound. Thomas Phosphate Powder, 17% phosphoric 

 acid, at $22.50 per ton, would cost $1.30 per unit, 

 or 6%c. per pound. 



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