Welcome everybody,
I am into bonsai for 2 years. Now I am looking for a good recipe for ginko soil mix. I have heard that akadama is a good choice, but what should I choose as other components and what proportions.

Kind regards form Warsaw/Poland

Hello and welcome.

You dont need special soil for your ginko. Regular or "bonsai" soil they sell in stores is fine. You may also check following sources for home made soil.

dengarden.com/gardening/How-to-Mix-Your-Own-Bonsai-Soil
adamaskwhy.com/2017/01/27/i-feel-so-soiled/

Use a well-draining soil, but add 10% coarse sand and some grit.