Dr. Babnik
Virtus ex Alto
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What an interesting project you have there!The main issues with egg shells in your soil mix is that like bone meal, it takes a long period of time to break down. If you properly crush them, or grind them into a dust almost, add worms to your soil, and have a good living mix with some sort of TLO, this probably would be negated and allow the egg shells to be deconposed and absorbed much quicker.
I plan to digg up earhworms and invite them to live in my pots. Though I do not know if they survive the chemical ferts.
Another thing I was thinking about is horse maneur. Could that be used? Does it need to composted? I live in an apparment building and don't have facilities to make compost.