Prehistoric farmers in what is today China had two main crops: millet in the north, rice in the south, and a vast middle region of mixed farming.
You should absolutely look at this map in high-resolution because there is a lot going on. It shows the northermost limit of rice cultivation and the southernmost limit of millet cultivation, possible centers of the domestication of each, and shows archaeological sites where rice, millet, or both were grown in prehistoric times.
