In general most of the problems that gypsum is recommended for, like
buffering pH problems and breaking up heavy clay, can be solved by adding
organic matter, and perhaps rock dust as well. But gypsum is faster at
solving some problems if you have really bad soil.
I had very good success with gypsum when I found that the large organic
garden at my previous rural home had soil pH of 8.2 due to the previous
owner's dumping of 4 cords worth of wood ash per year on a 5000-square foot
plot. Most nutrients are locked up at the pH, and there's no way I could get
enough mulch to buffer the pH. I added about 300 lbs of gypsum over the
course of 4 months, and found that the pH had dropped to 7.0.
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