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When was the ancient agricultural science system in China formed?
The Book of Qi Yao Min written by Jia Sixie in the Northern Wei Dynasty is the earliest and most complete agricultural book in China. This book has a great influence on the development of ancient agriculture, and its appearance marks the formation of China's agricultural practical scientific system.

From the Qin and Han Dynasties through the Three Kingdoms, the Jin Dynasties to the Southern and Northern Dynasties, this stage is another important period for the development of ancient science and technology in China. During the Qin and Han Dynasties, Qin unified the whole country, and the unification of writing weights and measures had an important impact on the development of science and technology. Han inherited the Qin system and further consolidated the feudal system. National unification not only promotes scientific and technological exchanges, but also concentrates manpower and material resources, thus better carrying out scientific and technological research.

During the Three Kingdoms, the Jin Dynasty and the Southern and Northern Dynasties, in order to consolidate their rule, the opposing regimes mostly took measures to develop production, which promoted the development of production technology and practical science. The great ethnic integration has promoted the exchange and development of science and technology.

Extended data:

Improvement of farm tools: the iron plow pulled by cattle was used in Sui and Tang Dynasties, irrigation tools were widely used in Tang Dynasty, and Ma Jun's keel waterwheel was popularized.

The emergence of agricultural books

Lu Yu's Sui and Tang Tea Classics is the earliest tea monograph in China and even in the world.

Chen Fang's Agricultural Book of Song Dynasty is the earliest small comprehensive agricultural book in China, which summarizes paddy field farming in Jiangnan area.

Wang Zhennong's book in Yuan Dynasty.

Chen Fang Nong Shu in Song Dynasty is a monograph on rice planting technology in southern China, and Wang Zhen Nong Shu in Yuan Dynasty vividly describes the development of agricultural machinery. During the Song and Yuan Dynasties, various plant catalogues appeared one after another, such as Orange Record, Litchi Record, Chrysanthemum Record, etc., and monographs on crustaceans, birds and fish also appeared one after another. ?

In terms of technology, agricultural technology and water conservancy projects have made unprecedented development, and the improvement of agricultural technology is mainly reflected in the improvement of farm tools. During the Sui and Tang Dynasties, ox-drawn iron plows were widely used in cultivated land in southern China, and paddy field farming techniques were also improved.

Baidu Encyclopedia-China Ancient Science and Technology