Well, since I'm doing a slightly controlled experiment, I'm limiting anything added to the soil. Mycos and Osmocote only....over simplify the operation to prove viability cause we seem to have a LOT of new growers that get caught up in the nuances of trying to eek out every last gram before they actually have a handle on getting a grow to finish.......I was in that category and learned a bunch real quick. There's nothing like getting 1 or 2 under your belt to add confidence to start experimenting further.
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Not too shabby for twice used soil, Osmocote and straight tap well water from a limestone aquifer.