40 EXPERIMENT STATION. [Jan. 



(d) Trade Values of Fertilizing Ingredients. 



Nitroo-en • — Cents 



i>iiuuj,eii. per Pound. 



In ammonia salts, ......... 17^2 



In niti'ates, 181/2 



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



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



Organic nitrogen in fine^ bone and tankage, .... 20^^ 

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

 Phosphoric acid : — 



Soluble in water, 5 



Soluble in ammonium citrate (reverted phosphoric acid), . 4^2 

 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^ 



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 ISTew 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 $36.20, 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. 



