In our modern capitalist society, Jewish farmers can’t really observe the shmita year — the once every seven years tradition of letting the land lie fallow so farmers can rest and refresh themselves. There are too many economic forces at play. But Jewish farmers can at least follow the spirit of the tradition, they say. They can let pieces of the land lie fallow for the year, or they can use parts of it for more communal purposes like education. Following the spirit of the tradition still allows farmers, both locally and outside the Philadelphia area, to get some of...