I use also fertilizer. All based on effective microbes. Have a look here:
http://www.eminfo.info/
I use a mix of bokashi juice and EM A. I use only a fifth of the recommended dose but I use it weekly. I don't know what the reason is to make such long breaks like a months or two weeks. If you use Osmocote there is a steady release of the nutrients. So I decided to use less but this more often. My neps are very happy with it. Also I put it on the sarras and the vfts but this only with a 10th of the recommended dose and they got also a good push after I used it.