COMMERCIAL FERTILIZERS 41 



No. 10456 



JOHN DOE & COMPANY, 

 of Lafayette, Tnd., 



Guarantee this 

 Doe's Grain and Clover Producer 



to contain not less than 

 1.6 per cent, of total nitrogen, (N). 

 2.0 per cent, of potash, (K.2O), 



soluble in water, 

 8.0 per cent, of soluble and reverted 



phosphoric acid, (PjOs), and 

 2.0 per cent, of insoluble phosphoric 

 acid, (P0). 



Purdue g 



Experiment 



Station, 



LaFayette, Ind. State Chemist. 



How to estimate the value of a fertilizer. It is the 



custom in most states for the state department having 

 control of fertilizer inspection to make annually an estimate 

 of the value, per pound, of nitrogen, phosphoric acid, and 

 potash. These values may be obtained by writing to the 

 State Agricultural Experiment Station. For example, in 1921, 

 the estimate prepared in Indiana was 20 cents per pound for 

 nitrogen, 7.5 cents for phosphoric acid, and 7.5 cents for potash. 

 The figures obtained from state authorities may be used to 

 determine the relative values of similar mixtures offered for 

 sale by different manufacturers, or of different mixtures sold 

 by one manufacturer. They may, in some cases, roughly 

 indicate what a reasonable selling price should be. 



Taking the analysis of the fertilizer given in the example, 

 a ton (2000 Ibs.) will contain: 



Nitrogen ........................ 1.64 per cent ( 32.8 Ibs. at 20 cts.) $6.56 



Phosphoric acid .................. 8.00 per cent (160 Ibs. at 7.5 cts.) 12.00 



Potash .......................... 3.00 per cent ( 60 Ibs. at 7.5 cts.) 4.50 



Total value ............................................... $23.06 



To this amount should be added enough to cover reasonable 

 expenses and profit of the dealer. 



