2O8 THE FIRST BOOK OF FARMING 



expensive than the higher priced high grade mix- 

 tures. 



For example: 



A certain potato fertilizer on the market, which 

 we will call mixture A, has the following guaran- 

 teed analysis: 



Ammonia 7 to 8 per cent. 



Available Phosphoric Acid 6 to 7 " 



Actual Potash 5 to 6 " 



A ton of this would contain: 



Pounds. 



Nitrogen 115.4 value at I7^c.. . $20.19 



Available Phosphoric Acid ... 120 " " 4c 4.80 



Potash 100 " " sc 5.00 



Totals 335.4 $29.99 



Add to this the average charge for mixing, bag- 

 ging, selling, profit, etc., $8, and the cost will be 



$37-99- 



The selling price of this fertilizer would probably 

 be not less than $40. Now suppose the farmer 

 thinks this a high priced and expensive fertilizer 

 and looks about for something cheaper. He finds 

 a low grade potato fertilizer, which we will call 

 mixture B, that has the following guarantee : 



Ammonia 3j^ to 4 per cent. 



Available Phosphoric Acid 3 to 3^ " 



Actual Potash 2> to 3 " 



Just one-half the guarantee of the high grade mix- 

 ture A. A ton of this contains : 



