COMMERCIAL FERTILIZERS CONTINUED 2O^ 



v/ 



Ammonia 2 to 3 per cent. 



Available Phosphoric Acid 8 to 10 " 



Total Phosphoric Acid 1 1 to 14 " 



Total Bone Phosphate 23 to 25 " 



Actual Potash 10 to 12 " 



Sulphate of Potash 18 to 20 " 



A better statement would be as follows : 



Nitrogen 1 . 65 per cent. 



Available Phosphoric Acid 8 " 



Totol Phosphoric Acid (furnished in 



Bone Phosphate) 1 1 



Potash (furnished in Sulphate of 



Potash) 10 



Ammonia is reduced to terms of nitrogen by mul- 

 tiplying by .824. All bone phosphate is forty-six 

 per cent, phosphoric acid. When bone phosphate is 

 given instead of phosphoric acid it simply makes 

 the mixture appear to have more in it, and when 

 both phosphoric acid and bone phosphate are stated 

 one is merely a repetition of the other. The same 

 is true of the statements, potash and sulphate of 

 potash, one is a repetition of the other only a dif- 

 ferent form. 



VALUATION 



The experiment stations not only publish com- 

 parative analyses of the registered fertilizers but 

 they also compute the market values of the plant 

 food contained in them and compare these valua- 

 tions with the selling price of the fertilizers. 



They also furnish a list of trade values of the 

 plant foods in raw materials for the convenience of 



