In reply to Timmd:
> I think I've got enough to be searching on what to find out about now.
I think I asked on your other recent, related thread, what it is you are studying, or trying to find out about.
If you gave us that context, it might help us to guide you to suitable instructive material.
> It seems to be that water availability and nutrient uptake (cationic exchange) and pH are combined,
Well, you need water to put nutrients into an available state, and to create an aqueous solution with a given pH.
https://en.wikipedia.org/wiki/PH
> do you know anything about pH buffering, what the term of buffering relates to/the factors involved?
A pH buffer is (for acid buffers) a weak acid and its conjugate salt (or a weak base and conjugate salt for alkaline buffers). The two interact to prevent changes in pH, by changing acid to salt, or salt to acid, mopping up or releasing H+.
https://www.google.com/search?q=ph+buffer