When was wheat introduced to China and where did it originally come from?

Wheat was introduced to China around 5000 years ago from West Asia through the Central Asian steppes, because wheat is not well adapted to the temperate monsoon climate of the Yellow River Basin, and the drought in the spring is the most fatal, so up to the Qin Dynasty, wheat could only be planted in the central plains in the irrigated riparian areas, and cultivated areas and yields were very low, which is precisely why, although wheat was introduced to China very early, it did not become the mainstream early on. The first time I saw it, it didn't become a staple.

But that said, by the time of the Spring and Autumn and Warring States periods, wheat had become a common crop in the central plains of China, with wheat production spreading across almost the entire North China Plain and the Yellow River Basin.

Ancient knowledge of wheat:

Ancient people found that wheat can be used to make pasta, made into flour and then processed, the taste is much better, but because of the conditions, in the stone mill and so on the emergence of the popularity of the ancient times before the wheat processed into flour is still difficult, the efficiency is very low, so until the period of the Han Dynasty, the popularity of stone mill and other tools to a certain extent, to change the situation of wheat. changed the situation of wheat.