Maize appears in Chinese local records

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Chinese local gazetteers begin recording maize in the middle decades of the sixteenth century, within roughly two generations of the crop leaving the Americas and before any European traveller described its cultivation there. Ho Ping-ti assembled this gazetteer evidence in 1955 and it remains the basis for dating the introduction. The route by which it arrived — overland through Central Asia, by sea to the southern ports, or both — is not settled. The crop's significance in China was upland: it made hill country cultivable that rice and wheat could not use.

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