MIXING OF FERTILIZERS 



173 



phoric acid is also furnished, and this amount, deducted from 

 100 pounds, leaves 88 pounds to be furnished by 16 per 

 cent acid phosphate. Sixteen will go into 88 five and one- 

 half times, hence 550 pounds of acid phosphate will be re- 

 quired. Adding, we have 1750 pounds of material to which 

 must be added 250 pounds of make-weight or filler. 



Type of conversion of fertilizer from one formula to 

 another: 



In the above calculations the plant food elements have 

 been computed on the basis of the phosphorus combined 

 as phosphoric anhydride (P2Oo), the nitrogen as ammonia 

 (NHs), and the potassium as potassium oxide (KoO). The 

 reason for this is that it is on this basis that it has become 

 customary to buy and sell the elements. 



The above types will cover all of the contingencies likely 

 to arise in the home-mixing of fertilizers. 



