So how is that a serious question, unless you want to involve me with academic pedantries?
"Please, how is "soil" different from "soil"?"
Like I said, differences in how fertilzed it is, so how much humus it contains. And what kind of humus, ph value, .. you know it.
The research here is basically using flies as fertilizers.
My question without reading any further is, where are getting the flies their food from? From outside the system probably and not from the soil. But maybe insects are still helpful, so good, that this student showed it, right? Why then nonsensical?
Please, how is "soil" different from "soil"?