Yes the fertilizer will be absorbed with the immersion method. Although watering by immersion is often suggested to beginners most experienced growers avoid this method preferring to water, and fertilize, from above. Please take a look at the general growing sticky located at the top of the forum, make sure to follow the links that you find there.
Trees kept inside under, presumably, low light conditions tend to not be as vigorous compared to their growth under better conditions. Excessive fertilization in this environment tends to lead to weak, lanky growth. I think I would cut that fertilization schedule back by at least half, or even more. When the tree enters a more active growth period, next spring outdoors?, you can step it back up.
By the way you should try to give more information when posting. Species would be a good place to start.