By fertilizer do you mean manure? I am still new to dirt, could tell you a crap load(pun intended) about dwc, but not too much about dirt. I started with the best dirt I could find, FFOF, so I would have to worry about fertilizer n could just give them nutes once they start needing it seeing how I have bottles of every kind of nute on deck for my hydro stuff. I have read on here cow crap is too hot for plants, rabbit and chicken poo is great for pot plants, and then there’s things like work castings and such. All this is stuff I read that I’m not positive I remember correctly so I would take everything I say with a bit of a grain on salt when it comes to dirt grows.