Fertilizer dosage/frequency based on potting media

[groundpounder17]

As the title states, I have some questions on fertilizer use depending on the potting media. My plants are all either in traditional bark mix or sphagnum moss. I have been using a liquid fertilizer from orchidlimited/orchidweb called Green Jungle. I like it and my plants like it, but it’s too expensive so I’m switching to MSU formula. My question is regarding dosage. Currently I feed my plants in sphagnum every 3rd feeding while I feed my plants in bark at each watering with a flush every couple weeks.

My thought with the MSU formula would be to feed at 1/4 tsp/gallon with a frequency of at every watering for the bark mix and every other watering for the sphagnum. This is ~50 ppm N. I’m not really sure how much I was feeding with the green jungle fertilizer. It just said 1% nitrogen on the bottle, but that doesn’t sound right.

Basically I’m just needing some advice so I make sure I don’t burn up my orchids.

Edit: don’t know if it matters, but many of my plants are young. I have Cattleya, Angraecum, Vanda (seedling), Bulbophyllum, Paphiopedilum, Psychopsis, Beallara Marfitch, and several Laelia purpurata