Grains refer to grains in ancient times, and there are two ancient sayings. One category refers to rice, millet, millet, wheat and glutinous rice; The other refers to hemp, millet, millet, wheat and glutinous rice. The first statement, there is rice without hemp, and the second statement, there is hemp without rice.
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According to historical records, the earliest "five grains" cultivation in China appeared in the Shang and Zhou Dynasties. During the Shang and Zhou Dynasties, China was in the prosperous period of slavery society, and the varieties of crops planted by people increased, and the state vigorously supported the development of agriculture. The "well-field system" implements collective labor and improves labor productivity.
During this period, a complete drainage irrigation system appeared, and people began to use manure, green manure and plant ash. These conditions made agriculture develop further in Shang and Zhou Dynasties.
Millet, millet and other crops in the five grains have the characteristics of drought tolerance, barren tolerance and short growth period, so they occupy a particularly important position in the original cultivation of dry land in the north. In the Spring and Autumn Period and the Warring States Period, the characteristics of "keeping old is easy to do" were discovered, and together with millet, it became an indispensable food for people at that time.