What can best reflect the level of agricultural production in Tang Dynasty?

A portable short crankshaft plow, also known as Jiangdong plow. It first appeared in Dongjiang area in the late Tang Dynasty, and its appearance is a sign of the maturity of farming tools in China. Before the plow was widely used, it was the main farming tool. Animal-drawn plows have been gradually popularized in some places since the Spring and Autumn Period and the Warring States Period.

Production tools are an important factor of productivity, and a certain type of production tools marks a certain level of productivity. The improvement and extensive use of farm tools played an important role in the development of agricultural production in Tang Dynasty. Before the Tang Dynasty, heavy long straight-axis plows were difficult to turn and cultivated land was laborious. In the long-term production practice, farmers in the south of the Yangtze River created Qu Yuan Plough.