Bulletin 1280, U. S. Department of Agriculture 
Plate IV 
-v. A 
4~ - 
.:7""".i-rx 
;:::;::: /'\ 
~rr—.— ~ 
Triangular diagram showing the fertilizer ratios obtainable from combinations of mono- 
ammonium phosphate, rnonopotassium phosphate, and potassium nitrate with a fourth 
fertilizer material 
