1910.] 



PUBLIC DOCUMENT — No. 31. 



51 



(d) Trade Values of Fertilizing Ingredients. 



Nitrogen: — 



In ammonia salts, . . 



In nitrates, . . . . . . . . . . . 



Organic nitrogen in dry and fine ground tish, meat, hlood and in high- 

 grade mixed feT'tilizcrs, ........ 



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



Organic nitrogen in coar.se bone and tanliage,' . . . . . 



Pho.sphoric 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 chloride.^i, ........ 



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



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



The above schedule of trade values was adopted at a meeting 

 of the station directors and chemists from the New England 

 and New Jersey experiment stations, which was held in March, 

 1909. 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 ]\Iarcli 

 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 differ- 

 ence of the licensed complete fertilizers analyzed in Massa- 

 chusetts during the season of 190.S and 1909: — 



It must be remembered that the " commercial values " re])re- 

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



1 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 ba.sed upon the degree of finene.ss, 



