I never claimed they didn't know about crop rotation, I claimed that vast areas of the South CHOSE NOT TO rotate crops. That was a really common problem from the early 1800s through the early 1900s... "king cotton," it was the cash crop, wealthy farmers would monocrop cotton until the soil was near-useless, move west, buy more land, and do it again. It left huge areas of poor soil, which led to the dust bowl.
I never claimed they didn't know about crop rotation, I claimed that vast areas of the South CHOSE NOT TO rotate crops. That was a really common problem from the early 1800s through the early 1900s... "king cotton," it was the cash crop, wealthy farmers would monocrop cotton until the soil was near-useless, move west, buy more land, and do it again. It left huge areas of poor soil, which led to the dust bowl.