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The dating results of China, Canada and Japan show that they are more than 7600 years ago. Aohan Banner in Inner Mongolia is recognized as the origin of millet in the world. Millet is domesticated from Setaria viridis. Setaria viridis and millet have one thing in common, that is, the yield is not high, and the yield is only about 50 kg per acre. At the same time, the south is happier because rice can be grown there.