I believe the premise to be false, while it is true that you can eat many different "weeds" I cannot find any methodology or theory where that doing so increases the efficiency of land use. There are some key things like nutrients in == nutrients out and digestibility in humans which is not a given.
That said, there were some interesting recipes for what are nominally weeds in the Foxfire[1], and Euell Gibbons books[2] which were certainly edible although nothing I've tried really struck me as exceptional. As Boy Scouts we got a merit badge for creating a meal out of locally harvested plants, that was fun.
That said, there were some interesting recipes for what are nominally weeds in the Foxfire[1], and Euell Gibbons books[2] which were certainly edible although nothing I've tried really struck me as exceptional. As Boy Scouts we got a merit badge for creating a meal out of locally harvested plants, that was fun.
[1] http://www.foxfire.org/thefoxfirebooks.aspx
[2] http://www.amazon.com/Euell-Gibbons-Handbook-Edible-Plants/d...