How to translate from ppm of N to weight units?
1
Let’s start with 75 ppm of Nitrogen.
2
75 ppm is 75 mg in one Kg because 1 ppm is 1 part in 1’000’000 by weight or 0,000001 of 1 Kg
There is NPK with the rate 15%-09%-20% available
3
75 mg is the nitrogen (N) weight only.
Recommendation in culture guides
4
It is necessary to know weight of entire fertilizer. But we know that 75 mg is 15% from the entire fertilizer weight
5
Thus, to find an entire weight we need to calculate: 75 x 100/15 = 500 mg of fertilizer in 1 liter.
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