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Now here is the conversion formula I have found:
One can estimate the parts per million in solution (ppm) produced by a quantity of fertilizer in a gallon of water, based on the fertilizer's N-P-K rating.
For each number in the rating apply the following formula:
> one teaspoon (5ml) of a given fertilizer in a gallon of water
(10xN)÷ 0.768 = ppm
> one tablespoon (15ml) of fertilizer in a gallon of water:
(10xN)÷ 0.256 = ppm
Example: Peter's Professional All-Purpose Fertilizer with N-P-K rating of 20-20-20.
(10x20)÷.768=260.4 ppm
Therefore, one teaspoon (5ml) of Peter's Professional All-Purpose 20-20-20 in one gallon of water will produce a solution that contains approximately 260.4 ppm of Nitrogen, 260.4 ppm of P (P2O5), and 260.4 ppm of K (K2O) for a TOTAL ppm of approximately 781.3 .
Most of my P is coming from bone meal and not salt.
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