And as noted, it is mostly gypsum, which is good at lightening clay soil.Hi Tony and thanks for correcting my remembered expectation of raising pH. ... You sent me googling gypsum soil pH though and the results from that tend to suggest that the effect is pH neutral.
Gypsum (CaSo4) also releases dilute sulfuric acid when mixed with water, so
it will acidify soil considerably (and is used as such in ag--the opposite
of lime)
Toby
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