That’s interesting about cowpeas, and it sounds like it is working well.
Thanks for the information on bacteria and nitrogens too, I haven’t visited that subject in over a decade. Out here water-soluble urea salts are in good supply with factories just north of us in L.A. county.
Honestly this is useful when you are doing it by the acre. You get a cover crop and a significant amount of nitrogen because one acre is 43560 square feet. A compost pile that is what, 25 square feet? The amount would be quite insignificant. You could piss on the pile for a day and end up adding more nitrogen.
I actually did the math; a heavy crop of alfalfa, one of the highest nitrogen fixers, would take an entire grow season to deposit 1.34 grams of nitrogen per square foot. Most others would be less than half of that. The average daily load of nitrogen in a person’s urine is 12~20 grams.
Heck a mixed gallon of Miracle-gro contains a measly 1.512 grams of nitrogen. The average daily urine is about 1 liter (800~1,200ml), diluted 5:1 with water is more than a gallon, and still contains 12~20 grams of nitrogen.
Actually it is both Nitrogen & fungi.
Abd the process doesn’t require roots.
Just require sugar or starch.
Bacteria use FeMo-Cofactor enzyme primarily.
There is multiple different variations of FeMo-Cofactor.
The primarily enzyme has Iron, Sulfur & Molybdenum.
There is a version with only Iron & Sulfur, no Molybdenum.
A version with Vanadium substitution for the Molybdenum.
A version with Cobalt substitution for 1 Iron.
One with both substitutions.
In fungi & yeast it is Nickel enzymes which fix nitrogen & alter Nitrogen States creating Urea & other Nitrogen chemicals.