Rice is the plant of Asian origin. The earliest record of rice in the world comes from Non Nok Tha in Thailand, where it dates back to 3500 BC. Oryza sativa the rice grown in India and south east Asia is first mentioned in Neolithic Chirand in North Bihar (2000-1300 BC) and was also recorded in Hastinapur (1100-800 BC) and some other places.