COMMERCIAL FERTILIZERS 205 



actual fertilizing constituents per ton. These figures 

 are practically true of other states where large quan- 

 tities of commercial fertilizers are used." 72 In states 

 where smaller amounts are used the difference between 

 the estimated cost and selling price is greater than 

 P-50. 



These facts emphasize the economy of home mix- 

 ing. The difference in price between the raw mate- 

 rials and the product sold is frequently so great that 

 it is an advantage for the farmer to purchase the raw 

 materials, as sulphate of potash, nitrate of soda, and 



8 



gj 



fS if 



a' 5 N 

 FORMULA No. i. g &3 



Pounds. Pounds. g 



Nitrate of soda 500 containing nitrogen 77.5 3.87 



Acid phosphate 1200 containing phos. acid... 168.0 8.40 



Sulphate of potash .. 300 containing potash 150.0 7.50 



Total 395.5 



FORMULA No. 2. 



Nitrate of soda 250 containing nitrogen 38.7 1.99 



Acid phosphate 900 containing phos. acid... 126.0 6.3 



Sulphate of potash . . 450 containing potash 225.0 11.5 



Plaster, etc 400 



Total 389.7 



FORMULA No. 3. 



Nitrate of soda 200 containing nitrogen 31.0 1.55 



Acid phosphate 1500 containing phos. acid... 210.0 10.50 



Sulphate of potash . . 150 containing potash 75.0 5.75 



Plaster, etc 150 



Total 316.0 



