Champa rice is a quick-maturing, drought resistant rice that can allow two harvests of sixty days each per growing season. Champa rice is from the Aus rice sub-population, which shares similarities with both the Japonica rice and the Oryza sativa rice varieties. Likely originating from Eastern India, Champa rice was introduced from the Champa Kingdom into Song China in the 11th century. Champa rice was then sent to Song China in the 11th century as a tribute gift from Champa during the reign of Emperor Zhenzong of Song (r. 997–1022).Lynda Noreen Shaffer, A Concrete Panoply of Intercultural Exchange: Asia in World History (1997) in Asia in Western and World History, edited by Ainslie T. Embree and Carol Gluck (Armonk, N.Y.: M.E. Sharpe), p. 839-840. Song dynasty officials gave the quick-growing champa rice to peasants across China in order to boost their crop yields, and its rapid growth time was crucial in feeding the burgeoning Chinese population of over 100 million.
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