This is kind of a vicious circle. Surely ,as if energy, nutrients cannot be ‘created’ ,but simply transferred from one crop or place, to another, or ‘mined’ from the mineral soil. Imports from other places supplement the circle (like a working capital).
It is very difficult to become 100% self financing. Yes, one might grow composting materials on extra land, but that only delays the issue. Does it matter that a given plot is self sufficient? Do any of us really have time in our lives to be so ‘puritanical’ ,so as to be’smug’ in knowing that we make no demands of others?
