Looking for specific info on fertilizing

[DevFox]

How does one go about figuring out how much fertilizer to add to a plant where the pot has no drainage hole, so the water/fertilizer solution is not ran through the pot, and no occasional leeching/flushing out of the media is done? What gets added to the container stays there until the plants takes it up, or the medium breaks down to the point that it needs to be replaced.

Currently, I'm looking to figure this out for my phalaenopsis.

I'm sure there's a better way to ask this question, but I can't remember or don't know the specific terms regarding watering and potting methods, so please excuse me. Thanks.