Best advice would be to have a soil test and see what your soil is lacking. If you need calcium and you also need to raise your PH then add lime. If PH is ok and you need to add Gypum to raise you calcium. Sometimes nutrients get locked up in the soil and the plant suffers you might need to adjust this by using a foliar calcium supplement. The best ones would be in a chealted form. Adding sheetrock to your garden would cost lots more than a bag of gypsum. I really don't think you would want the bonding agents in the sheetrock on your soil either.
Tim
|