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> I do a 50% water change weekly. I have not been
> adding any K, on the theory that my frequent water
> changes do that. Is that likely to be correct?
Maybe, do you know what is in your water supply? It can vary
quite a bit - you should be able to get a breakdown from your
local water district. Some are even online.
For example, my water is very low in most dissolved salts of any
kind, 40 ppm max. I have to supplement just about everything:
K+, Ca++, Mg++, NO3-, B, Fe, etc etc etc.
There are ways to know if your plants are suffering from
a deficiency based on how the leaves are affected. Chuck
Gadd has an article covering this at