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曾养活数亿人的红薯,亩产高达 3 千公斤,却为何至今没能成为主粮?
提起红薯,许多人可能会想到烤红薯或甜品,但在历史上,红薯在中国的发展中扮演了至关重要的角色,曾养活了数亿人。红薯和玉米作为大航海时代传入中国的粮食作物,对明清时期人口增长起到了关键作用,其中玉米因其高产,红薯则因其能在贫瘠的丘陵土壤中生长。清朝中前期 ...
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