From my experiments with feeding I believe that frequent weak strength fertilising is much better for bonsai than stronger infrequent fertilising. I had been taught by Megumi Bennett and read in several places about fertiliser cakes and thought that these would be a great way to achieve this. After some trial and error I have found a successful way of making feeding cakes for bonsai. Read all about it here.
Fertilising bonsai with feed cakes
Matt's Bonsai Blog 