16 BULLETIN 1280, U. S. DEPARTMENT OF AGRICULTURE 
The quantities of these materials, together with monopotassiuni 
phosphate and potassium nitrate, required for a ton of an 8-6-6 
fertilizer may then be calculated by help of equations (1) , (2) , and (3) t 
with results as follows : 
Case 1 Case 2 
(pounds) (pounds) 
Alonoammonium phosphate 160. 7 52. 7 
Monopotassium phosphate 39. 8 39. 5 
Potassium nitrate 228. 228. 3 
Ammonium nitrate 229. 9 
Tankage 1,337.7 
In a similar way, calculations may be made of fertilizer mixtures 
using four materials of other composition, or any additional number 
of fertilizer compounds. 
SUMMARY 
The materials now used in the fertilizer industry contain, as a rule, 
only one of the three plant-food constituents. Consequently, the 
calculation of the quantities of these materials required for a mixed 
fertilizer of given analysis formula is a comparatively easy arith- 
metical process. 
As the number of materials, particularly of single constituent 
materials, available for a fertilizer mixture is reduced, the range of 
fertilizer analysis formulae which they are capable of making is also 
reduced, and the difficulty of the ordinary arithmetical method of 
calculating any mixture may be greatly increased. 
It is pointed out that the number of materials used in mixed 
fertilizers is likely to decrease, and that the concentration of those 
used will probably increase. 
A method is presented whereby it can be quickly ascertained, by 
means of triangular diagrams, whether a mixed fertilizer of given 
analysis formula can be made from combinations of two-fertilizer- 
constituent materials. 
Formulae are given for the computation of the respective quantities 
of these materials required for making mixed fertilizers in those 
cases in which the fertilizer can be made from these materials. 
Tables are presented giving the results of such computations for the 
52 analysis formulae adopted by conferences of agronomists and 
fertilizer manufacturers as standard for the 24 States represented. 
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