Re: CULT: Gypsum (was Old sawdust)
- Subject: Re: CULT: Gypsum (was Old sawdust)
- From: A* M* R*
- Date: Fri, 6 Nov 1998 16:15:30 -0600 (CST)
From: Amy Moseley Rupp <amy@ece.utexas.edu>
> All the advice which I have been given is that gypsum will
> NOT acidify soil. I can't pretend to be a chemist but gypsum
> is hydrated calcium sulphate and it seems to me that it will
> produce one negative and one positive ion. Thus it shouldn't
> do much to change the pH, or am I overlooking something.
The other piece of advice I have been given is that gypsum works
only in soils with lots of sodium... I guess because the sodium
would easily bind with one of the molecules, perhaps the one already
in plentiful supply in the soil thus buffering pH?
Gypsum is only supposed to *buffer* your pH, not raise or lower it
but rather nudge it towards 7.0. Buffers are by nature pH neutral.
--Amy
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