No I'm using eggshells and molasses for cal
The hickory ash is for K
Bone meal for P
Blood meal for N
As for where I got it from you go find a hardwood be it oak or hickory what every you can find then cut it down and split it come winter you set it on fire for heat after a while you clean out the ash box and bam ferts

didn't buy Them anywhere if that's what you were wondering I just cleaned out my grandpaws stove
astro has a surplus more than likely if your looking for some
EDIT: sorry goauto a hardwood is a type of tree
Trees are like cactus but better most don't poke ya and some make food they are brown and grey with green things we call leafs they can get tall too
I hope that helps you understand what a tree is