Some of my favorites with a farm/rural flavor are:
"Early" about a farming community in Iowa,
"Water From Another Time" sung by John McClutchen, and
"Who Will Watch The Home Place".

There is also a wonderful musical play, "Plain Hearts........", by Eric Polteneimi, et al, which featured the song, "Tree of Life". It is about the rigorous life of the pioneer women in the Great Plains. I have more details at home.