Derald wrote:
"Terry Coombs" wrote:

We're building a house , and I find myself with small pieces left
over . Are these any good as a soil amendment ? Gypsum iis the main
ingredient , and I don't know if it acidic or basic . I don't really
have any other way to dispose of this stuff , if I can add it to my
compost heap that'd be a double plus .
Gypsum is often used to add calcium without adversely affecting pH.
Whether that's what it does, I dunno. It also is added to clay soils
in an attempt to "improve" its texture. Dunno whether that works,
either. Gypsum also is used to reduce the concentration of sodium in
certain soils. Dunno whether....
You may find these enlightening or confusing:
http://ag.arizona.edu/yavapai/anr/hort/byg/archive/gypsum.html
http://puyallup.wsu.edu/~linda%20chalker-scott/Horticultural%20Myths_files/Myths/Gypsum.pdf
To address your question directly:
I, personally, would eschew adding gypsum wallboard ("sheetrock")
because I don't know what other compounds or chemicals might be used
in its manufacture.

Well , looks like it goes to the landfill then ...though the addition to
clay soils is intriguing ... ours here is best described as clay and silt
with rocks .

--
Snag