No. 6. 



DEPARTMENT OF AGRICULTURE. 



813 



Composition of Raw Materials. — In order to form a correct idea 

 of the cost per pound of the fertilizer constituents of these ma- 

 terials, it is needful to determine their composition or, in other 

 words, the quantities of valuable constituents each contain. The 

 following- table shows the composition of the raw materials used 

 in the manufacture of fertilizers. No analyses of these materials, 

 with the exception of ground bone and dissolved rock, have been 

 made in Pennsylvania. The figures in the following table include 

 the averages of the results of analyses made in Connecticut and 

 Massachusetts during the past year, except in the case of ground 

 bone and dissolved rock phosphates, where Pennsylvania results 

 alone are included. 



Composition of Non-Acidulated Fertilizer Ingredients. (Per cent.) 



Composition of Acidulated Fertilizer Ingredients. (Per cent.) 



•Also contains 3.54 per cent, nitrogen. 



Cost per pound of Fertilizer Constituents. — With the composition 

 of these raw materials and their price per ton, hundred weight, or 

 other unit of measure as a basis, the wholesale cost per pound of 

 the valuable constituents can be readily calculated. In many cases 

 the ammoniates are quoted "per unit of ammonia," the term unit 

 being equivalent to per cent.; good sold by the ton of 2,000 lbs., 

 the unit is equal to 20 lbs., and 20 tits, of ammonia contain 16.47 lbs. 

 of nitrogen. 



