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Re: [APD] Re: PH

> The question dealt with pH, not hardness.  Within reasonable limits, GH
> doesn't seem to have any ill effects (although KH might, at high levels,
> around 15 or so.)

At high pH trace metals are much less soluble in water.  I have some
doubts as to whether this effect becomes important until the pH rises
fairly high -- 8 or 8.5 or so.  I saw this effect fairly strongly in a
garden with soil pH in the 8.3 - 8.4 range.

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