Example: Food for 



Nitrogen i.65Xi5^=*5-5 cents. Plants 



Available phosphoric acid 8X 7/^=36.0 !^ 7 



Insoluble phosphoric acid zX z = 4.0 " 



Potash sX 4/ / 2= : *3-5 " 



Total value of xoo pounds 79.0 cents. 



79X20=1580 cents, or $15.80 value per ton. 



If the potash is given in the form of sulphate we find the 

 equivalent of actual potash by multiplying the per cent, of sul- 

 phate by .54 and the result by the trade value, 5^ cents. 

 If the potash is given in the form of muriate (chloride), 

 multiply the per cent, of muriate (chloride) by .63 and the 

 result by the trade value, 4^2 cents. 



Example I. A manufacturer's guarantee-analysis is 8 

 to 10 per cent, of potash as sulphate: 8X-54 4-3 2 P er 

 cent, of actual potash; 4.32 x $y 2 cents=23-7 cents, the trade 

 value of actual potash as sulphate in 100 pounds of fertilizer. 



Example 2. A manufacturer's guarantee-analysis is 6 

 to 8 per cent, of potash as muriate (chloride) 6X-63=3-78 

 per cent, of actual potash; 3.78 X 4 ^2 = 17.0 cents, trade 

 value of actual potash as muriate in 100 pounds of fertilizer. 



Summary of the methods heretofore used In converting 

 one chemical compound into an equivalent of another chemi- 

 cal compound. 



(a) To change Nitrogen into an equivalent amount of 

 ammonia, multiply the given amount of Nitrogen by 1.214. 



(&)To convert ammonia into an equivalent amount of 

 Nitrogen, multiply the given amount of ammonia by .8235. 



(c) To convert a guaranteed per cent, of Nitrate of 

 Soda to an equivalent of Nitrogen multiply the per cent, of 

 Nitrate of Soda by 16.47. 



(d) To convert a guaranteed per cent, of sulphate of 

 potash to an equivalent of actual potash multiply the per cent, 

 of sulphate by .54. 



(e} To convert muriate (chloride) of potash to an 

 equivalent amount of actual potash, multiply the per cent, of 

 muriate (chloride) by .63. 



(/) To convert actual potash to an equivalent per cent, 

 of sulphate of potash, multiply the per cent, of actual potash 

 by 1.85. 



