Stone
Well-Known Member
From above what Mike? Efficiency can't be greater than 100%
K and P are elements, and they can't be created from other elements (except maybe in a nuclear reactor). And since moss and lichens are not nuclear reactors, they can't leach more than what they need for themselves, or can pull out of the dust and water vapor in the air (which ain't much either).
Unless he lures hoards of birds to poop on the top of the wall.:evil:
I was under the impression it was an embankment with trees and soil behind the wall.