OK I don't pretend to be a big dog at all scientifically speaking. But is it not true that the reason we use P at all so that the plant can form ATP? And isn't ATP also dependent on a shit load (that is a scientific term btw) of enzymes and aren't those enzymes almost totally dependent on Mg?
Yes and sort of. But it seems you're barking up the wrong tree. You, I and DizzleKush seem to be in agreement. P is used for ATP, but we don't need nor want a lot of P when roots and shoots are growing.
Seems to me getting the ratio right might be the most important thing.
I have tried low Mg...no fuckin bueno and I don't need a scientist to tell me that.
Ditto. That is why I suggest Mg < 80 ppm wrt Ca:Mg ratio of 2 or higher.
I have tried all kinds of levels of K and find somewhere around equal to N to be pretty good...maybe bumping a hair after stretch.
That is what I love about folks like you, Dizzle, SS, etc., we test these things, as well as try to understand the science. Even though you suggest you don't understand the science I think you're being coy and self-depreciating (both good things) .
I have tried all kinds of P levels...although, honestly, I have not tried high P and low K together so I cannot comment on Hammerhead's technique...and I personally don't think it much matters within reason. In fact, I find no real reason to go over 30 ppm ever in a grow, unless you don't have another source of K.
FWIW, Hammhead doesn't use high P and low K AFAIK. He was trying to make a factual statement from that one part of that one study, in an attempt to 'one up me' (he doesn't like me).