Parts per million (ppm) of nutrient element in solution when the specified amount (1 gram or 1 milliliter) of

fertilizer compound is dissolved in 1 gallon of water. 

ppm of element in solution
Fertilizer                                         Formula or Percentage                                Amount per gallon	N	P	K	Ca	Mg	S	Cl
Potassium nitrate                     13.75-0-44.5 936.9K)                          1g.	36		97
Potassium sulfate                     0-0-50 (41.5K, 17S)                            1g.			110			45
Muriate of potash                    0-0-60 (49.8K, 45Cl)                           1g.			131				119
Monopotassium phosphate      0-22P-28K                                           1g.		60	75
K-Mag or Sul-Po-Mag           0-0-22 (18K, 11Mg, 22S)                    1g.			48		29	58
Monocalcium phosphate          0-46-0 (20P, 13Ca)                              1g.		53		34
Calcium nitrate                        15.5-0-0                                                1g.	41			50
Calcium chloride                     77-80% (28Ca)                                     1g.				74			169
Ammonium nitrate                   33.5-0-0                                                1g.	88
Ammonium sulfate                   21-0-0 (24S)                                         1g.	55					63
Urea                                       46-0-0                                                   1g.	121
Nitric acid                               70% (15.5N)                                         1g.	41
Nitric acid                               70% (.209g.N/ml)                                  1ml	55
Ammonium polyphosphate      15-60-0 (26.2P)                                     1g.	39	69
Diammonium phosphate          18-46-0 (20P)                                        1g.	47	53
Phosphoric acid                      75% (23.7P)                                           1g.		62
Phosphoric acid                      75% (.385g.P/ml)                                    1ml		96
Gypsum (Calcium sulfate)       (18.6Ca, 14.9S)                                       1g.				49		39
Epsom salts                            (9.9Mg, 13S)                                           1g.					26	34

For all practical purposes 3.5 ounces of the fertilizer compound dissolved in 100 gallons of water would yield the same

ppm of element in solution as those given above for 1 gram per gallon. (28.35 grams = 1 ounce)