On 7/26/2014 11:15 AM, 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 .

Hi, Terry.
Used to seeing you on the metalworking news group. I recently subscribed
to this one also.

My brother has tilled scrap drywall into his garden many times and it
works wonders, here in the desert. Last Spring I bought 100 lbs of
powered gypsum and hand broadcast it on our garden.

We have volcanic sand for soil and have added manure. leaves, straw and
all kinds of material to make the soil hold moisture. It works, but
turns the soil acid. Beets, carrots, potatoes and other root vegies like
neutral or slightly basic soil.

After the addition of the gypsum, all the vegetables are growing better
than they ever have. I will add more next Spring!

So, yes, use you tiller to break up the old drywall and improve your garden.

Good luck, Paul in Central ORegon