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What are those circular crops I see from the plane?

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When flying over the midwest or southwest, I often see large green circles, sometimes in big bunches. I figure they must be a crop of some kind, but what? And why are they planted in circles? Does it have to do with irrigation? On my last trip I saw some were being harvested in pie-shaped sections. I'm counting on Fodorites to solve the mystery. Thanks.

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