COMPUTATION OF FERTILIZER MIXTURES 
11 
Y = Weight of material containing b' per cent P 9 5 , and c per cent 
K 2 0. 
Z = Weight of material containing c' per cent K 2 0, and a' per cent 
NH 3 . 
Then* = 2000 ^ ^ A + a'cB-a' V C (1) 
ah' c' + a f be 
v 2000 B -bX , 
Y = 7-7 ■ , and 
„ 2000 C-cY 
(2) 
(3) 
c 
For the particular case where the three materials used are mono- 
ammonium phosphate, monopotassium phosphate, and potassium 
nitrate respectively, 
v , , , onnn 2430.54 .4 + 582.845- 879.23 C 
X, monoammomum phosphate = 2000 
Y, monopotassium phosphate 
71945 
2000 B-Q1.72X 
52.18 
Z, potassium nitrate 
2000 0-34.6 Y 
46.58 
The number of fertilizer ratios it is possible to make from these 
materials is limited, as already explained, and the same is true of 
any three materials which contain two constituents each. How- 
ever, by successively combining these materials in pairs with ammonia, 
phosphoric acid, and potash salts, nine possible combinations are 
obtained and can be used, by varying the materials in any combina- 
tion, to make any fertilizer ratio whatever. In Table 5 are given 
expressions for calculating for each of these nine combinations the 
quantities of the materials required for any fertilizer formula falling 
within the triangle representing the combination in Plate II. 
Table 5. — Expressions for calculating the quantities of material required for a 
ton of an A-B-C fertilizer when materials that contain two fertilizing elements 
are combined in pairs with an NH Z , P 2 5 , or K 2 salt 
Mixture of— 
X 
Y 
Z 
M NH 3 
M K 2 
M P 2 5 
x+y+M^o- 
X+y+MWr ---- 
2,000 A 
2,000 B-V Y 
b 
2, 000 A 
a 
2,000 B-bX 
b' 
2,000 C 
c 
2,000 C 
c 
2,000 B 
¥ 
2,000 C-c'Z 
2,000 B 
¥ 
2,000 C-cY 
c" 
2,000 A-aX 
a" 
' NHj 
x+y+M Pf0 .._ 
y-t-Z+MxjTT 
2,000 B-bX-b'Y 
2,000 C-cY 
c' 
2,000 A 
2,000 A 
a' 
2,000 A-aX 
a' 
2,000 C 
c' 
2,000 C 
c' 
2,000 A-a'Z 
a" 
b" 
1 NH.3 
2,000 B-V Y 
P2O5 
Y+Z 4-M-v n - 
2,000 C-cY-c'Z 
c" 
2,000 C-c'Z 
c" 
b" 
Z+ X+Mrr /\ --• - J 2,000 B 
Z+X+Mxttt .... 2.000 B 
2,000 A-a'Z-aX 
z+x+M P2(V ::_ 
b 
2,000 A-a'Z 
a" 
2,000 B-bX 
a 
b" 
X, quantity of material containing a per cent NH3 and b per cent P2O5. 
Y, quantity of material containing ¥ per cent P2O5 and c per cent K2O. 
Z, quantity of material containing c' per cent K2O and a' per cent NH3. 
Wjajj- quantity of material containing a" per cent NH3. 
Mp q quantity of material containing b" per cent P2O5. 
Mt^q quantity of material containing c" per cent K2O. 
