132 COTTON 



No. 2. Guaranteed Analysis. 



Nitrogen 2 to 2.75 per cent. 



Phosphoric Acid 9 to 11 per cent. 



Potash 2 to 3 per cent. 



Cost per ton, $28. 00. 



Let us calculate its value as in the case of No. 1 : 



Nitrogen 2 by 20 = 40 Ibs. @ 15c. = $6.00 



Phosphorus 9 by 20 =180 Ibs. @ 5c. = 9.00 



Potassium 2 by 20 = 40 Ibs. @ 5c. = 2.00 

 Commercial Value per ton $17.00 



In purchasing commercial fertilizers your aim 

 should be to obtain the largest amount of plant 

 food at least cost. In the first fertilizer $13.80 

 worth of plant food would cost you $30.00 while 

 in the second $17.00 worth would cost you but 

 $28 . 00. The difference between commercial value 

 and selling price is due to the cost of manufacture, 

 profits, agent's commissions, etc. With the first 

 this difference is $16.20 while with the second it is 

 but $12.00, a clear saving of $4.20 per ton, and 

 No. 2 superior to the other in every way, since you 

 secure 8 pounds more of nitrogen and 40 more of 

 phosphorus. 



You will often find printed on fertilizer bags 

 analyses as follows: 



Ammonia 2 to 3^ per cent. 



Available phosphoric acid 8 to 10 per cent. 



Total phosphoric acid 11 to 14 per cent. 



Actual potash 10 per cent. 



Sulphate of potash 18 to 20 per cent. 



This reduced to its true meaning should read as 

 follows : 



Nitrogen 1 . 65 



Phosphorus 8 



Potassium 10. 



