Interesting, what kind of debate? Possibly something to keep in mind, but when ancient Chinese authors are talking about grain, they are probably talking about

Interesting, what kind of debate? Possibly something to keep in mind, but when ancient Chinese authors are talking about grain, they are probably talking about wheat, barley, millet or sorghum, rather than rice. The nucleus of Chinese civilization was in the Yellow river region, in northern China, where rice was not a native plant - as opposed to the Yangtze and Cantonese regions of China, which were colonized later.