So lets have a quick talk about TH mix...
50 lbs of bone, lets assume 4-12-0, the original mix is roughly 36 cubic feet of base + 50 lbs bone, 100 lbs 3-2-2 chicken compost.
Now lets first assume this is field soil density...what kind of PPM is that?
N - 1200 PPM
P2O5 - 3600 PPM ( P ~1600)
N - 1800 PPM
P2O5 - 1200 PPM ( P 530)
K2O - 1200 PPM (K 1000)
So, 3000 PPM N, 2100 P and 1000 K in field soil. In a mix weighing 1/4 of that in bulk density, all those numbers are quadrupled... Speaking of balance?
It works because a lot of the N is slow release from the bone, some is used to fuel decomposition and the rest is leached to the sub-soil. Some K gets pushed out from the 20 lbs of gypsum that is recommended in the original mix also...
Tom Hill mix needs large containers and spring rains to make them perform as best they can.
How much Fe and Na do you think the Bone and SupR bring to the mix?
Why post this? End results are what matters. Science isn't perfect, experimenting is always your best learning tool.