"Are they talking about carbon or carbon compounds?"
Didn't say.
The issue of "carbon loss" was one I had never heard
of before. I just inferred that it must be an issue known
in agricultural research from a comment in the description
of the study. It measured both carbon and nitrogen levels
in fields over several years with different crop rotations,
with stubble left in place or tilled in, with and without
fertilizer added, etc. I was only reading the summary,
not the complete research report, so I don't know what
molecules exactly they were testing to determine
"carbon level".
The document on composting has pretty good descriptions
of the activity of the different kinds of microorganisms
that operate on compostable materials and how varying
conditions in compost piles (and probably soil) affect
them. It doesn't have microscope photos, lab results, etc,
but it does have a lot more detailed explanations than
one usually finds in consumer level publications.
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