Billy the Mountain
Well-Known Member
Not exactly, at least in the US.Iirc, a 1 lb. bag of dry amendment, 4-4-4, would be 4% nitrogen, 4% phosphorous, 4% potassium. So would a teaspoon.
I believe cannabis prefers a close balance of ferts.
Nitrogen is listed as actual nitrogen percentage, but the P and K percentages are for the oxide, not the elemental weights.
So a 10-10-10 for example is
10% N
10% P2O5 (4.4% P)
10% K2O (8.3% K)
It's elemental label would be 10-4-8
I may be wrong, but I think the EU and/or Australia lists both the oxide and elemental percentages on the bag, unlike the US.