Stake ferts are BAD!!! Those are NOT designed for cannabis. I've seen enough people kill their plants with fertilizer stakes to say NEVER use them. You could get lucky, but why risk it?
You NEED to fertilize somehow. You can use compost, organic soil amendments, or liquid, or maybe you are lucky and have extraordinarily rich soil (I doubt it; even around here in the farmlands surrounding the CT/Deerfield river valleys the farmers STILL spread liquid manure!!!) but you need food.