If there are any actual worries about calcium - which is often present in soil in plentiful quantities - and one is inclined to stay organic, you can always add Calcium Carbonate or Citrate, (dolomite only if you need to alter PH) or even just good old ground egg shells. We keep a coffee grinder specifically for the task of reducing them to useable particle size. It doesn't take too much. Generally, just mixing a few spoonfulls around the root ball will do you for the growing season.
I always get naysayers about egg shell calcium, but for me, it gets used in sterile mixes, and I have yet to ever get BER, or calcium deficiency. Aerated compost teas are also good sources of calcium. I use them as both a root soak and foliar. They don't have to be used 1:1. I have used as weak as a 20% concentration.
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