The [following] divide [a field] for peah: a river, a canal, a private road and a public road, a public path or a private path that is in constant use during the hot season and the rainy season, fallow land, plowed land, and a different species.  [If] one harvests premature grain, he creates a division; [these are] the words of R' Meir. But the Sages say: It does not divide, unless he plowed.