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09-26-2009, 04:07 PM #7Senior Member
Amending hard packed clay soil
If it's an alkaline clay you can add gypsum (calcium sulfate) as well as the alfalfa and mushroom compost mentioned already, they'll work better together.
The only time not to use gypsum is with an acid clay like ancient mangrove soil. These will hardpan if you add gypsum.
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