I mix my soil (2 bags roots organic to 1 bale promix) in a 35 gallon trash barrel and add in 3 cups which works out to about 1 1/2 tablespoons per gallon of soil. This is how much I've been adding for the past 3 years or so, it's not broke so I don't fix it. After that I PH my nutes and water going in the plants to about 6.5 to 6.8 and I never, never, never check the soil ph or the ph of my run off and haven't flushed a plant (early or mid grow) in years. I do flush one week before harvest though. In fact I don't own a soil ph meter anymore, although I do have a water ph meter that I use every time I water and feed. I threw away the soil meter after I fucked up my first grow with it.
Any deficiencies are then taken care of by adding what nutes the plants need as the grow progresses. I expect yellowing at 4 weeks and add in light amounts of veg nutes to take care of the deficiencies. I use the fox farm line up with the 3 solubles (open seseme, beastie blooms, cha ching) and roots ecelerator and that's it.
Oh ya in case I forgot to mention it I Never check soil or run off ph.
