Why did you go to Niu Geng with an iron plow?

The iron plow was produced in Niu Geng during the Spring and Autumn Period and the Warring States Period, and it was the most important mode of production in ancient China. It promoted the development of productive forces and the disintegration of well-field system. One of the important reasons for the rapid development of agriculture in Niu Geng and Tang Dynasty was the further promotion of Tieli Niu Geng. In the Yellow River Basin, Gansu and Xinjiang, the iron plow Niu Geng has been widely used in agricultural production. This situation is not only recorded in the literature, but also reflected in some tombs in Dunhuang and Yulin Grottoes and many murals "Niu Geng Map". Most of them are carried by two cows with long single-axis plows; A few people use cattle to cultivate land, and plows have double long straight shafts and short curved shafts. Ploughs are all made of iron, and the plow wall (soil) is often used. At this time, Niu Geng was also popularized in the south of the Yangtze River, using Qu Yuan's plough. (Tang) Lu Guimeng recorded in detail the structure and effect of the curved plow used in Jiangdong (now Jiangnan) area. Crankshaft plow is lighter than straight-axis plow, and the plow shaft is bent to facilitate deep ploughing; Low traction point and stable plow frame; The plow shaft is shortened and the rotation is convenient. This is the most advanced walking plow in ancient times. However, at that time, few people used this plow, and the most people used two cows to lift the bar. According to documents and archaeological data, Tieli Niu Geng is still popular in the frontier areas.