Shultz orchid fertilizer

[Ray]

1) What's the nitrogen concentration in the fertilizer?
2) At what concentration do you want to feed?

Personally, I recommend about 100-150 ppm N at every feeding for a general collection living in any non-tropical environment. Using the average, that's 125 mg/L. If the fertilizer is 10% N, then you'd need to add 10 x 125 = 1.25g to a liter to get that nitrogen concentration.