I do unless it is in something dirty, the typical bonsai mix lets it wash out quickly. It can depend on the stage of the tree, and seasons, some get really into the science of it all. I have seen enough of the names who don't get into 0-10-22 now, or 56-8-17 then, the holy grail of ruffling bonsai feathers was when Walter said get what ever is on sale and use it all year.
For some this is ok, is it necessary, no not IMHO, you may be able to optimize some growing options by doing this, but is beyond most of us, for lack of understanding, and equipment to check things with.
Might want to do 1/2 strength every week with seaweed, or kelp based every other to complement the chemical ferts.