The Imperial Orphan of the Tang Dynasty

(1) "Tongjian" said: "In Yuan Hezhong, Zhenwu cultivated 4,800 hectares of land, and harvested more than 400,000 grains. "The yield per mu is about 1 stone.

(2) "New Tang Dynasty Book Food and Goods" contains: "Han Chonghua is the envoy of Zhenwu, Jingxi Yingtian, Helian, and water transportation,...... Recruit people for 15 tuns, 130 people per tun, and people cultivate 100 acres,...... More than 3,850 hectares of land are cultivated, and 200,000 stones of millet are harvested every year. According to the calculation of this material, the tuntian cultivated a total of 1,950 hectares of land, and the total yield per mu was 1.025 stones.

(3) "New Tang Dynasty Book: The Biography of Cui Hongli" said that Cui Hongli "moved the envoy to the Heyang Festival, so that the Qin Canal in Hanoi was governed, and the fields were irrigated for thousands of hectares, and the annual harvest was 80,000 hu", and "200 hectares of barren fields were opened up under the Qin canal, and the annual harvest was 20,000 hu". The average yield per mu is also 1 stone. Wu Hui said that 1 stone of Tang is equivalent to 3 stone of Han. Tang mu yielded 1 stone, which is equivalent to 3.818 stone in ancient Han.

(4) The New Tang Dynasty Book of Food and Goods says: "In Gyeonggi, the official tax of one mu per field is five liters, and the private rent collection is twenty times that of one mu to one stone." It is reduced to medium, and the rent is still half of it, which is ten times the official tax." The landlord collects five tenths of the rent, rents 1 stone, and the yield per mu should be 2 stone. This is Gyeonggi Liangtian.

(5) Li Ao's "Book of Pingfu" said: "One acre of land, strong and half weak, from time to time in water and drought, although not able to do the best of the earth, not a stone." Wu Hui said that the yield per mu of Tang is 3.81 stones, and then taking into account factors such as planting beans, the same as Han, playing nine or four folds, which is equivalent to 3.75 stones per mu of Han volume, which is equivalent to 334 catties per mu of the current city system.