Tom ... I think we can let you in as an Honorary member. You have always had great advice and an ability to bring some real technical stuff about water chemistry and the like down to almost anyone’s understanding.
So take the next number you have my vote.
ADA AS is "dirt" as well, is that included? It's clay loam, we have million's of metric cubic meter's worth in rice paddies. Pretty much the same stuff.
Non commercial will not suit the definition either.....since many use Miracle Grow etc.......and it's processed etc.......
Revise the definition somewhat to account for this? Or leave it be?