Fiat, I am trying to teach you how the bulb works in soil media. It likes to be moderately moist not too rock dry. That is just what I am saying, and helping you test for later when the soil is wet or not. You ask when to water..then I am telling you how to know when you can safely start to water it. Some knows it easily just by picking up the container too..just different ways.
I did understand what you said, pretty much you are now starting again to revive that bulb. Typically, when you get the bulb and plant it first time in soil, that is what you do, put the bulb midway, neck showing and water the soil, with or without roots, and then you will have to wait before watering again, because it is so easy to overwater and rot the bulb. I gave you tips how to test if your soil is still wet below, the top part will easily dry out, or in your case, you said the top part is dry but lower part is still moist, but that lower part may take time to dry out.
Can't answer why your bulb did not make roots in the glass container, because mine made it and is still making it right now and is so visible below and around the glass container. It could be you pulled it out before it had the chance to make new ones.
Anyways, good luck..hope your bulb revives.
