20 



The above schedule of trade values is based upon the condition of 

 the fertilizer market in centres of distribution in New England dur- 

 ing the six months preceding March, 1902, and refers to the current 

 market prices of the leading standard raw materials which enter 

 largely into the manufacture of our commercial fertilizers. 



The following is a list of such materials : 



Sulphate of ammonia, 

 Nitrate of soda, 

 Azotine, 

 Dried blood. 

 Cotton seed meal. 

 Castor pomace, 

 Linseed meal, 

 Dry ground fish, 

 Bone and tankage. 

 Dry ground meat, 



Dissolved bone, 



Ground phosphate rock, 



Acid phosphate, 



Refuse bone black. 



High grade sulphate of potash, 



Muriate of potash, 



Sulphate of potash-magnesia, 



Kainite, 



Sylvinite, 



Crude saltpetre. 



Valuation. The approximate value of a compound fertilizer or 

 any material used for fertilizing purposes is obtained by calculating 

 the value of each of the three essential elements of plant food 

 (nitrogen, phosphoric acid and potassium oxide, including the differ- 

 ent forms of each wherever different forms are recognized in the 

 table), in one hundred pounds of the fertilizer and multiplying each 

 product by twenty to change it to a ton basis. The sum of these 

 values will give the total approximate value of the fertilizer per ton 

 at the principal places of distribution. 



