i64 



Food for We want from 20 to 40 pounds of Nitrogen, 120 to 160 pounds 

 of phosphoric acid, and from 40 to 60 pounds of potash. 

 In compounding our formula we will take the higher number 

 for Nitrogen (40 pounds), and will take the Nitrogen in about 

 equal proportions; that is, 10 pounds of Nitrogen from each 

 of the four nitrogenous constituents. We begin with Nitrate 

 of Soda, containing 15.75 pounds of Nitrogen in each 100 

 pounds of the Nitrate. Now, how many pounds of Nitrate 

 of Soda must we have to get 10 pounds of Nitrogen ? It is a 

 very simple calculation; since in 100 pounds there are 15.75 

 pounds of Nitrogen there must be in i pound of Nitrate of 

 Soda the one-hundredth part of 15.75 pounds, or .1575 

 pounds of Nitrogen. Hence, we must have about 63^ 

 pounds of Nitrate of Soda.* 



We make a similar calculation for sulphate of ammonia, 

 as follows: 100 pounds of sulphate of ammonia contain 

 20.50 per cent, of Nitrogen. Therefore, i pound of sulphate 

 of ammonia contains the one-hundredth part of 20.50, or 

 .2050, and we have .2050 -^ 10,000 = 48.7 pounds, or we 

 simply take 50 pounds of sulphate of ammonia, which con- 

 tain 10.25 pounds of Nitrogen. Like calculations for all 

 the raw materials are made, and, after estimating the required 

 quantities for all the constituents, we have: 



•i 



Mater- 

 ial, 

 Lbs. 



63i 



100 



400 



515 



100 



45 



i.273i 



Nitrate of Soda 



Sulphate of ammonia.. . . 



Dried blood 



Dissolved bone meal 



Dissolved bone-black. . . . 

 Sulphate of potash (high 



grade) 



Muriate (chloride) 



Total quantities in i ton. 

 Per cent, in I ton 



Nitro- 

 gen, 

 Lbs. 



10.00 

 10.25 

 10.52 

 10.40 



41.17 

 2.05 



Phosphoric Acid, Lbs 



Avail- 

 able. 



54.12 

 86.00 



1 40 . 1 2 



7.00 



Insolu- 

 • ble 



16.28 

 1-54 



17.82 

 0.89 



Total. 



1. 91 



70.40 

 87-54 



15985 

 7-99 



Potash, 

 Lbs. 



38.60 

 23.60 



62.20 

 3i» 



*.i575-^ 10,000 X 63^^ pounds. 



