@bullfrog420 these are the kinds of grows I was referring to that do regular plant and runoff testing to help dial in feeding.
Years back I started playing with individual nutrients. I wanted to create my own custom recipe for my rez from scratch. That was harder than it looks. I wish I would of had a lab to test my stuff back then, it would of helped. Hahaha I had some bad trial and errors. Hahahaha I fried a few plants here and there. Hahahaha