The non-arable land meme comes from a paper that considered land non-arable if it had 25% crop yield (due to things like bad soil or too rocky or too much of a

The non-arable land meme comes from a paper that considered land non-arable if it had 25% crop yield (due to things like bad soil or too rocky or too much of a grade). Yet the things that make land non-arable also reduce their yield for animal ag on that same land.