Many of us are soil growers myself included, I personally run 2/3 ffof and 1/3 ffhp (mixed with Perlitre and mkyos).
Now unless your growing a photo monster ive read it’s near impossible to have a mag deficiency, if your growing in fresh soil.
So that aside I wanted a discussion on if we need cal to be added?
If your running tap water like myself you have minterals in your water Wich for me is mainly cal and mag.
My water sample is here:
Now personally I mostly run autos and use tap water so I’m wondering if I even need it, but again I would like to discuss at what point do we or don’t we if we at all need it in soil.