MIXING FERTILIZERS AT HOME 



253 



shipped. Consequently, if you know how to interpret 

 these figures, you will have no difficult}' in making your 

 calculations. Now we find (you can consult any book of 

 reference for the composition if not given on the bag) 

 acid phosphate contains fourteen per cent, phosphoric 

 acid, cotton-seed meal seven per cent, nitrogen, two and 

 one-half per cent, phosphoric acid and one and five-tenths 

 per cent, potash, and kainit twelve and one-half per cent, 

 potash : hence we get 



Acid Phosphate 



1200X0.14 = 168 pounds of phosphoric acid. 

 Cotton-Seed Meal 



400 X 0.07 = 28 pounds nitrogen. 



400 X 0.025 = 10 pounds phosphoric acid. 



400 X 0.015 = 6 pounds potash. 

 Kainit 



400X0.125 = 50 pounds potash. 



We get now 



PROBLEM II: In a ton of fcrtili/.er mixed in this 

 way what is the percentage of each element of plant food? 



Process: To find this percentage divide each element 

 by the total amount of the mixture. The calculation is as 

 follows : 



Phosphoric acid 1 78 -r 2000 = 8.y per cent Phosphoric Acid. 

 Nitrogen 28 -r- 2000 = 1 .4 per cent. Nitrogen. 

 Potash 56 -f- 2000 = 28 per cent. Potash. 



