1910.] 



PUBLIC DOCUMENT — No. 31. 



51 



(d) Trade Yahies of Fertilizing Ingredients. 



Cents per Pound. 



1908. 



Nitrogen: — 

 In atumonia salts, ........... 



In nitrates, . . • • • ■ . • 

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

 grade mixed fertilizer.^ 



Organic nitrogen in fine hone and tankage,' . . . . . 



Organic nitrogen in coarse bone and tanlcage,! . . . . . 



Phosphoric acid: — 

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



Soluble in ammonium citrate (reverted phosphoric acid), . 



In fine ground bone and tankage,' 



In coarse bone and tankage,' ........ 



In cottonseed meal, linseed meal, castor pomace and ashes. 

 Insoluble (in neutral citrate of ammonia solution) in mixed fertilizers, 



Pot.ash: — 

 As sulphate free from chlorides, ........ 



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



As muriate (chloride), ........... 



17^ 



20J^ 

 15 



5 



4 

 3 



4 



2 



5 



8 



414 



The above schedule of trade values was adopted at a meeting 

 of the station directors and chemists from the New England 

 and N^ew Jersey experiment stations, which was held in March, 

 1009. They represent the average cash pound cost, at retail, 

 of the three essential elements of plant food in their various 

 forms, as furnished by chemicals and unmixed raw materials, 

 in the large markets during the six months preceding ]\larch 

 1, 1909. The trade values for nitrogen and phosphoric acid 

 are somewhat lower than for the previous year. 



The following table shows the average comparative commer- 

 cial values, the retail cash prices and the percentages of diifer- 

 ence of the licensed complete fertilizers analyzed in Massa- 

 chusetts durine' the season of 1908 and 1909: — - 



Tt must be rememl)ered that the " commercial values " repre- 

 sent the retail price of the raw or unmixed materials, and that 



' Fine and medium bone are separated by a sieve having circular openings one-fiftieth of 

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



