What were the farming methods in China during the Spring and Autumn Period, Warring States Period, Qin and Han Dynasties?

During the Spring and Autumn Period and the Warring States Period, people began to use iron farm tools and Niu Geng, and gradually popularized them. The coupling plough popularized by Zhao in the Western Han Dynasty requires two oxen to pull and three people to control it. Later, the plow wall appeared, so that the iron plow could turn the soil in the same direction. In the Eastern Han Dynasty, Niu Geng's ploughing method was extended to the Pearl River Basin. After the Han Dynasty, Niu Geng with iron plough became the main farming method of Chinese traditional agriculture.