Farming system, irrigation, what was the Song Dynasty?

What were the farming methods, farming techniques, farming systems and irrigation in the Spring and Autumn Period, Western Han Dynasty, Wei, Jin, Southern and Northern Dynasties and Sui and Tang Dynasties?

Development of (1) iron plow Niu Geng

Spring and Autumn Period and Warring States Period: Iron farm tools and Niu Geng appeared and spread gradually.

After the Han Dynasty, Niu Geng with iron plough became the main farming method of Chinese traditional agriculture.

Sui and Tang Dynasties: Qu Yuan's Plow appeared-China's Plow was quite perfect and used by later generations.

(2) the progress of farming technology

Spring and Autumn Period and Warring States Period: Ridge Tillage Method

In the Western Han Dynasty, the sowing tool of the field substitution method was ploughing once a year.

Wei, Jin, Southern and Northern Dynasties: Tillage and harrow technology is still in use today.

After the Song Dynasty, the economic center of gravity moved south to the south of the Yangtze River, and rice and wheat were rotated twice a year, and in some places three times a year.

(3) Development of irrigation technology

Water conservancy project-Warring States period: Dujiangyan; Han Dynasty: Caoqu, Baiqu and Longshou Canal

Irrigation tools-Cao Wei period: rollover; During the Tang dynasty: there were tube cars; Song dynasty: hydraulic high-speed drum car; Ming and Qing Dynasties: Wind turbines.