40 EXPERIMENT STATION. [Jan. 



(d) Trade Values of Fertilizing Ingredients. 



Nitrogen:— per Pound. 



In ammonia salts, ......... 17^/^ 



In nitrates, I8V2 



Organic nitrogen in dry and fine ground fish, meat, blood, 



and in high-grade mixed fertilizers, ..... 20^/^ 



Organic nitrogen in fine* bone and tankage, .... 2OV2 



Organic nitrogen in coarse* bone and tankage, . . .15 

 Phosphoric acid : — 



Soluble in water, ......... 5 



Soluble in ammonium citrate (reverted phosphoric acid), . 4V2 



Soluble in fine* ground bone and tankage, .... 4 



Soluble in coarse* bone and tankage, . . . . .3 



Soluble in cotton-seed meal, linseed meal, castor pomace and 



ashes, 4 



Insoluble (in neutral citrate of ammonia solution) in mixed 



fertilizers, .......... 2 



Potash : — 



As sulfate, free from chlorides, 5 



As muriate (chloride), ........ 4^/4 



As carbonate, .......... 8 



The above trade values of fertilizing ingredients in raw ma- 

 terials and chemicals are the same as for the previous year, 

 and represent the values agreed upon by representatives of the 

 experiment stations in ISTevs^ England and the Middle States, 

 after a careful study of prevailing prices in the large cities in 

 these localities. 



The average comparative commercial value of the complete 

 fertilizers analyzed during the season of 1908 is $25.81, the 

 retail cash price per ton $3G.20, and the percentage of difference 

 40.25. 



1 Fine and medium bone are separated by a sieve having circular openings one fiftieth 

 of an inch in diameter, the valuation being based upon the degree of fineness. 



