1904.] 



PUBLIC DOCUMENT — No. 33. 



89 



suits of analysis and the manufacturers' guarantee, we are 

 of the opinion that poor mixing is responsible, rather than a 

 disposition on the part of the manufacturer to furnish an in- 

 ferior article. As })roof of this, we find in most cases that 

 wherever a fertilizer shows a low test in any one ingredient, 

 a corresponding high test is shown on some other element of 

 plant food in the same brand ; this usually corrects any dif- 

 ference in commercial value of the fertilizer. 



Trade Values of Fertilizing Ingredients in Raw Materials and (Jhcmicals, 

 1902 and 1903 {Cents per Pound). 



1902. 1903 



Nitrogen in ammonia salts, 

 Nitrogen in nitrates, . 



Organic nitroajen in dry and fine-ground fish, meat, blood and in liigli- 



grade mixeci fertilizers. 

 Organic nitrogen in fine bone and tankage, 



Organic nitrogen in medium bone and tankage, 



Phosphoric acid soluble in water, 



Phosphoric acid soluble in ammonium citrate 



Phosphoric acid in fine-ground fish, bone and tankage, .... 



Pkosphoric acid in cotton-seed meal, castor pomace and wood aslies, 



Phosphoric acid in coarse flsh, bone and tankage, 



Phosphoric acid insoluble (in water and in ammonium citrate) in 



mixed fertilizers. 

 Pota.sh as sulfate (free from chlorides), 



Potash as muriate, 



16.50 

 1.5.00 



16.50 

 16.00 

 12.00 

 5.(X) 

 4.50 

 4.00 

 4.00 

 3.00 

 2.00 

 5.00 

 4.25 



17., 50 



15.00 



17.00 



16.50 



12.00 



4.50 



4.00 



4.00 



4.00 



3.00 



2.00 



5.00 



4.25 



A comparison of the above trade values of fertilizing 

 ingredients for the years 1902 and 1903 shows a higher 

 market cost of nitrogen in form of ammonia salts and in the 

 higher grades of organic substances for the year 1903 than 

 for the previous year ; this is, however, largely offset by a 

 corresponding decrease in the market cost of the better forms 

 of phosphoric acid. 



The schedule of trade values for 1903 was adopted by 

 representatives of the Massachusetts, Connecticut, Rhode 

 Island, Maine, Vermont and New Jersey experiment sta- 

 tions, at a conference held during the month of March, 1903 ; 

 it is based on the condition of the fertilizer market in centres 

 of distribution in New England, New York and New Jersey 



