[Paul C. Jesup]

It's only been in the last few centuries that we've started figuring out how to maintain viable farms on the same plot of land for a long period of time. Historically, farming a plot of land until it was exhausted and barren, then moving on to a new plot of land, was the general approach.

Yes, crop rotation is such a fairly obvious idea.

[Chanticleer]

Interestingly enough, there were Biblical laws requiring a field to lie fallow every seven years to let it rest -- a sabbath for the land. Sometimes I think we've forgotten as much as we've learned.