In the mid 1970s, the discovery of cultivated millet on the Karuo site in Qamdo, Tibet,shifted the emergence of agriculture in Tibet to an earlier date in the middle Neolithic Age. In the early 1990s, carbonized grains of highland barlay were discovered on the Changguogou site in Gonggar county,Tibet, in association with those of millet. As the latter site is earlier than the former in date, it can be inferred that millet, introduced from the Central Plains, was once extensively planted in Tibet; later,highland barley with its strong adaptability was spread to Tibet from Western Asia, grew on a large scale, and gradually replaced millet as the main cereal in the Tibetan region.
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