232 AGRICULTURAL EXPERIMENT STATION. [Jan. 



Trade Values of Fertilizing Ingredients in Raw Materials and 

 Chemicals — Concluded. 



1890. 



Cents per Pound. 



Organic nitrogen in coarser bone and tankage, ... 8J 



Organic nitrogen in hair, horn-shavings and coarse fish scraps, 8 



Phosphoric acid soluble in water, 8 



Phosphoric acid soluble in ammonium citrate, . . . 1\ 

 Phosphoric acid in dry ground fish, fine bone and tankage, . 7 

 Phosphoric acid in fine medium bone and tankage, . . 6 

 Phosphoric acid in medium bone and tankage, ... 5 

 Phosphoric acid in coarse bone and tankage, .... 4 

 Phosphoric acid in fine-ground rock phosphate, ... 2 

 Potash as high-grade sulphate, and in forms free from mu- 

 riate or chlorides, ashes, etc 6 



Potash as kainite, 4| 



Potash as muriate, 4| 



The organic nitrogen in superphosphates, special manures 

 and mixed fertilizers of a high grade, is usually valued at the 

 highest figures laid down in the trade values of fertilizing 

 ingredients in raw materials, namely,, seventeen cents per 

 pound ; it being assumed that the organic nitrogen is 

 derived from the best sources, viz., animal matter, as 

 meat, blood, bones, or other equally good forms, and not 

 from leather shoddy, hair, or any low-priced, inferior 

 form of vegetable matter, unless the contrary is ascer- 

 tained. For similar reason, the insoluble phosphoric acid 

 is valued in this connection at three cents, it being assumed, 

 unless found otherwise, that it is from bone or similar sources, 

 and not from rock phosphate. In this latter form the phos- 

 phoric acid is worth but two cents per pound. 



The above trade values are figures at which, in the six 

 months preceding March, 1890, the respective ingredients 

 could be bought at retail for cash in our large markets, in 

 the raw materials, which are the regular source of supply. 



They also correspond to the average wholesale prices 

 for the six months ending March 1 , plus about twenty per 

 cent, in case of goods for which we have wholesale quota- 

 tions. The valuations obtained by use of the above figures 

 will be found to agree fairly with the retail price at the 

 large markets of standard raw materials, such as : — 



