just straight peat ?

BZ

Peat and perlite mixture

You coud use gypsum for calcium, and epsom salts for magnesium, in place if the lime. What are you planning on growing?

I like to grow mostly tomatoes, bell peppers, coriander and parsley. I don't have gypsum, how do I use the epsom with this setup ?.
I understand that lime is also to fix the PH of peat, am I correct ?

Lime = Calcium + Magnesium
Gypsum = Calcium
Epsom Salt = Magnesium

Thus, the Gypsum + Epsom Salt are required to provide both elements found in the Dolomitic Lime.

Lime does raise the pH of a mix, yes.

Josh

How much should I add to my peat ?
Isn't granite powder the same ?
Is gypsum the same used in plaster ?

yes same as plaster, but 99.9% of plaster used in building has additives in it to help it set etc..so I wouldn't use that for plants.

granite powder may have some K in it depending where it comes from after a quick google.

as for how much gypsum to use I wouldn't go overboard start out with the tablespoon a gallon and see how it goes.

BZ

But all that won't fix the acidity of Peat

Do you have any woodashes?

Josh

Not really but I have coal (wood), would that work ?