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 lbs. @ 15c. = $6.00 
Phosphorus 9 by 20 =180 lbs. @ 5c. = 9.00 
Potassium 2 by 20 = 40 lbs. @ 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. 
