i8 



Sulphate of ammonia, 

 Nitrate of soda, 

 Azotine, 

 Dried blood. 

 Cotton seed meal. 

 Castor pomace, 

 Linseed meal, 

 Dry ground fish, 

 Bone and tankage, 

 Crude saltpetre. 



Dissolved bone, 



Ground phosphate rock, 



Acid phosphate, 



Refuse bone black, 



High grade sulphate of potash. 



Muriate of potash. 



Sulphate of potash-magnesia, 



Kainite, 



Sylvinite, 



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

 ents of plant food for 1905, with the previous year, shows the follow- 

 ing variation : Nitrogen in form of nitrates is a cent higher per 

 pound. The higher grades of organic nitrogen, including nitrogen 

 classed in high grade mixed fertilizers, are a cent higher in cost than 

 for the year 1904. The cost of the different forms of phosphoric 

 acid and potassium oxide 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 (nitro- 

 gen, phosphoric acid and potassium oxide, including the different 

 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 prin- 

 cipal places of distribution. 



In case of bone and tankage, we calculate separately the nitrogen 

 and phosphoric acid value of each grade of mechanical fineness by mul- 

 tiplying the pounds of nitrogen and phosphoric acid per ton by the 

 per cent, of each grade, and multiply these products by the trade 

 values per pound, of nitrogen and phosphoric acid in each grade, and 

 express the final product in cents. Adding the separate values of 

 each grade of both ingredients, we have the valuation of the ma- 

 terial in question. 



