2. The yield per mu of millet in the late Warring States Period was 247 Jin. The Warring States period is an era when "millet" is mentioned side by side. Therefore, when calculating the output, we should also pay attention to the proportion of "millet" in the Warring States period. A family of five grows 25 mu of soybeans, accounting for 25%. Assume that the yield per mu of soybean is half that of millet, that is, one stone and a half, which is equivalent to the yield per mu 123.5 kg under today's market system.
3. 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.
4. 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.
5. In the history of China, the Tang Dynasty was a prosperous time, on an equal footing with the Han Dynasty. Taking into account factors such as planting beans, the yield per mu in the Tang Dynasty, like that in the Han Dynasty, was 94% off, equivalent to 334 Jin per mu under today's market system.
6. In the Song Dynasty, the yield per mu of rice in the south was equivalent to 38 1 kg, but the yield in the north was poor. In the Song Dynasty, the average grain yield per mu in the north and south was 309 Jin.
7. In the Yuan Dynasty, the grain output in the north resumed, and the average grain output in the north and south was equivalent to 338 Jin per mu under today's market system.
8. In Ming Dynasty, the farming level was improved, the production experience was more abundant, and the grain yield per mu was higher than that in Song and Yuan Dynasties.