Please combine the historical characteristics of Wei, Jin, Southern and Northern Dynasties to discuss the reasons for the large number of agricultural geography works in Wei, Jin and Southern Dynastie

Please combine the historical characteristics of Wei, Jin, Southern and Northern Dynasties to discuss the reasons for the large number of agricultural geography works in Wei, Jin and Southern Dynasties. Please combine the historical characteristics of Wei, Jin, Southern and Northern Dynasties, and discuss the causes of a large number of agricultural geography works in Wei, Jin and Southern Dynasties. On this issue, I think Li Daoyuan is known as "the greatest geographer in the Middle Ages". He is diligent and studious, and has traveled all over northern China. On this basis, he wrote 40 volumes of Notes on Water Classics, which is a masterpiece of ancient geography in China. The study of Shui Jing Zhu has always been a specialized knowledge. Ge Hong, named Yong, is a chemist and an alchemist. His thought inherited the tradition of pre-Qin legalists, attached great importance to the role of law, and opposed "benevolence", "quietness" and "no desire" to govern the country. Zu Chongzhi (429-500) was an outstanding mathematician and scientist in China. People in the Southern and Northern Dynasties, Han people, the word Wen Yuan. Born in Yuanjia for six years, he died in Hou Yongyuan and Qi Hun for two years. His ancestral home is Qiu County, Fanyang County (now Laishui County, Hebei Province). In order to escape the war, Zu Chongzhi's grandfather, Zuchang, moved from Hebei to Jiangnan. Zuchang was once a "great craftsman" in Liu Song, in charge of civil engineering; Zu Chongzhi's father is also a DPRK official. Zu Chongzhi received scientific knowledge from his family since childhood. When I was young, I entered Hualin University and engaged in academic activities. Throughout his life, he served as an official in South Xuzhou (now Zhenjiang City), such as Shi and Fu joining the army, Lou County Order (now northeast Kunshan City), Servant Shooter and Changshui Captain. Its main contributions are in mathematics, astronomical calendar and machinery. Jia Sixie was born in a scholarly family who has been farming for generations. His ancestors liked reading and studying very much, especially attached importance to the study and research of agricultural production technology knowledge, which had a great influence on Jia Sixie's life. Although his family is not very rich, he has a large number of books, which gives him the opportunity to read widely and learn from all aspects since he was a child, laying the foundation for his later compilation of Qi Yaomin's Book. As an adult, he began to embark on a career. He used to be a magistrate in Levin County (now Linzi, Shandong Province), and therefore he has been to Shandong, Hebei, Henan and other places. Wherever he went, he attached great importance to agricultural production, seriously investigated and studied local agricultural production technology, consulted some experienced old farmers and gained a lot of agricultural production knowledge. After middle age, I returned to my hometown, started farming and animal husbandry, personally participated in agricultural production and grazing activities, had personal experience in agricultural production, and mastered a variety of agricultural production technologies. During the period from the 2nd year of Yongxi in the Northern Wei Dynasty (533) to the 2nd year of Wuding in the Eastern Wei Dynasty (554), he analyzed, sorted out and summarized the agricultural technical data accumulated in many ancient books, the rich experience gained from consulting the old peasants and his own personal practice, and wrote a masterpiece of agricultural science and technology, Qi Yao Min Shu.