calcium is not all made the same
some forms take longer to react with the soil.
Certain forms should not be used for plants at all.
This type is used sometimes on soils, so its safe as far as that goes.
its normally used to raise the PH
unless you know your soil is acid, i dont see any reason to use it.
adding too much of anything can cause problems.
too much calcium can lockout other minerals (potassium, magnesium, maybe others)
If your soil is acidic, i would read up on it first...