COMMERCIAL FERTILIZERS 213 



cent, potash. This method of stating the composition 

 can be considered in no other way than a fraud, 

 especially when the fertilizer contains no sulphate of 

 potash, but cheaper materials, and the phosphoric acid 

 is not derived from bone. 



273. Estimated Commercial Value of Fertilizers, 



— The estimated value of a commercial fertilizer is 

 obtained from the percentage composition and the 

 trade value of the materials used. Suppose that two 

 fertilizers are selling for $25 and $30, respectively, 

 each having a different composition, the estimated 

 values would be obtained in the following way : 



Composition of Fertilizers. 



No. 1. No. 2. 



Selling piice $25. Selling price $30. 



Per cent. Per cent. 



Nitrogen as nitrates 1.50 2.10 



Phosphoric acid, available 8.00 io.co 



" " insoluble 2.00 0.50 



Potash (water-soluble) 2.00 3.50 



Pounds per Ton. 



No. 1. No. 2. 



Nitrogen 1.50 X 20= 30 2. 10 X 20 = 42 



Phosphoric acid . 8.0 X 20 = 160 10.0 X 20= 200 



Potash 2.0 X 20 = 40 3.5 X 20= 70 



Estimated Vaeue. 



No. 1. No. 2. 



Nitrogen 30 X o. 145 = $4.35 42 X o. 145 = $6.09 



Phosphoric acid 160 X 0.06 = 9.60 200 X 0.06 = 12.00 



Potash 40 X 0.045 =1.80 70 X 0.045 = 3- 1 5 



$15.75 $21.24 



