1907.] PUBLIC DOCUMENT — No. 33. 



67 



Trade Values of Fertilizing Ingredients in Raw Materials and Chemicals, 

 1905 and 1906 {Cents per Pound). 



1905. 1906. 



Nitrogen in ammonia salts 



Nitrogen in nitrates 



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



high-grade mixed fertilizers, 



Organic nitrogen in line bone and tanliage, 



Organic nitrogen in coarse bone and tankage, 



Phosphoric acid soluble in water, 



Phosphoric acid sohible in ammonium citrate, 



Phosphoric acid in fine-groimd flsh, bone and tankage 



Phosphoric acid in cotton-seed meal, castor pomace and wood ashes. 



Phosphoric acid in coarse fish, Ijone and tankage 



Phosphoric acid insoluble (in water and neutral citrate of ammonia) 



in mixed fertilizers, 



Potash as sulphate (free from chlorides) 



Potash as muriate (chloride), 



Potash as carbonate, 



17.50 

 17.00 



18.50 

 18.00 

 13.00 

 4.50 

 4. CO 

 4.00 

 4.00 

 3.00 



2.00 

 5.00 

 4.25 

 8.00 



17.50 

 16.50 



18.50 

 18.00 

 13.00 

 4.50 

 4.00 

 4.00 

 4.00 

 3.00 



2.00 

 5.00 

 4.25 

 8.00 



A comparison of the market cost of the various forms in 

 which the three essential elements of plant food are found 

 shows the nitrogen in the form of nitrates to be a half-cent 

 lower in cost than for the previous year ; the cost of the other 

 forms of nitrogen, as well as the various sources of potash 

 and phosphoric acid, remains the same as for 1905. 



The above schedule of trade values was adopted by repre- 

 sentatives of the Massachusetts, Connecticut, Rhode Island, 

 Maine, Vermont and New Jersey experiment stations, at a 

 conference held during the month of February, 1906, and 

 is based upon the condition of the fertilizer market in centers 

 of distribution in New England, New York and New Jersey 

 during the six months preceding March, 1906, and refers 

 to the current market prices, in ton lots, of the leading stand- 

 ard raw materials which furnish nitrogen, phosphoric acid 

 and potash, and which enter largely into the manufacture of 

 our commercial fertilizers. 



Table A, on a following page, gives the average composi- 

 tion of licensed commercial fertilizers for 1906. 



Table B gives a comjoilation of analyses of the so-called 

 special crop fertilizers, and shows the wide variation in the 



