Ancient American irrigation





In the Andean foothills of Peru, not far from the Pacific coast, archaeologists have found what they say is evidence for the earliest known irrigated agriculture in the Americas.

An analysis of four derelict canals, filled with silt and buried deep under sediments, showed that they were used to water cultivated fields 5,400 years ago, in one case possibly as early as 6,700 years ago, archaeologists reported in a recent issue of The Proceedings of the National Academy of Sciences.



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