7 



Phosphoric acid in cottonseed meal, castor pomace, ashes, 4.0 4.0 

 " " in coarse fish, bone and tankage, 3.0 3.0 



" " insoluble (in water and in neutral citrate 



of ammonia) in mixed fertilizers, 2.0 2.0 

 Potash as Sulphate and in forms free from Chlorides, 5.0 5.0 

 Potash as Muriate (chloride), 4.25 4.25 



The above schedule of trade values was adopted by representa- 

 tives of the Massachusetts, Connecticut, Rhode Island, Maine, Ver- 

 mont and New Jersey Experiment Stations at a conference held dur- 

 ing the month of March, 1903, 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, 1903, 

 and refers to the current market prices of the leading standard raw 

 materials, which furnish nitrogen, phosphoric acid and potash, and 

 which enter largely into the manufacture of our commercial fertilizers. 



The following is a list of such materials : — 

 Sulphate of ammonia, Dissolved bone. 



Nitrate of soda. Ground phosphate rock, 



Azotine, Acid phosphate. 



Dried blood, Refuse bone black, 



Cottonseed meal, High grade sulphate of potash. 



Castor pomace. Muriate of potash. 



Linseed meal, Sulphate of potash-magnesia. 



Dry ground fish, Kainite, 



Bone and tankage, Sylvinite, 



Dry ground meat. Crude saltpetre. 



A comparison of the market cost of the different essential ingredi- 

 ents of plant food for 1903 with the previous year shows the fol- 

 lowing variation : Nitrogen in form of ammonia salts is a cent higher 

 per pound. The higher grades of organic nitrogen are a half cent 

 higher in cost than for 1902. Water soluble and citrate soluble, or 

 reverted, phosphoric acid shows a decrease in cost of one-half cent 

 per pound. The cost of the other grades of nitrogen and phos- 

 phoric acid as well as the different forms of potash compounds 

 remains the same as in the previous year. 



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 (nitre- 



