Hoz, look into soft rock phosphate and stuff called K-Mag. You can get if for a great topdressing, to up the nutrient value in your soil. Can't go wrong with bone meal, I use blood meal more than EWCings myself.. I think it's as readily available ,as earthworm casting are ,, but hangs around longer in the soil, which help fortify your soil if added every year abit. Same with roch phosphate. You get a GOOD Living soil going,, and you shouldn't have to fertilize you plant very much if at all.. I don't feed my veg plants. I have to bloost my cal mag when I flip to flower, and I start adding some bloom right away also.. But once you get a good mix of good amendmeds,,, your done fertilizering,,, unless a plants yelling at ya or something.. Hope life is GOOD Keepem Green