To me, truly Sustainable Agriculture = Profitable Agriculture. But that isn't what the proponents have in mind.
Back in the early 80s it was LISA -- low input sustainable agriculture. They had 7-year rotations where 4 years were soil-rebuilding fallow. Maybe some could get by with 3 crops in 7 years but I'm not sure I could. It looked like a losing proposition to me then and still does.
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