1. Most of the grain in the early Warring States period was millet, which is converted into 205.8 Jin of millet per mu today.

2. The yield per mu of millet in Han Dynasty is equivalent to 28 1 kg under today's system; The average yield per mu of soybean in Han dynasty is equivalent to 264 Jin per mu under today's system.

3. During the Wei, Jin, Southern and Northern Dynasties, rice cultivation in the south was still extensive, and the yield per mu was not high, which was equivalent to that in the Han Dynasty. The yield per mu of dry land in the north also keeps the same level.

An acre of land

Ordinary years can produce one and a half stones of millet, which is equivalent to nine buckets per mu. According to Records of Historical Records Biography of Rivers and Channels, the land irrigated by water in Zheng Guoqu can get one clock per mu. A clock is six stones and four buckets, which is equivalent to three stones, eight buckets and four liters per mu. By the Han dynasty, the yield per mu was 3 stones (equivalent to 28 1 kg), which was recognized by the Han dynasty literature. Considering multiple cropping factors, it is also possible to produce 3.33 stones per mu; Extensive farming in the south, rice yield of 2.77 stones per mu, is also reasonable.