What are the conditions for developing agriculture in Jiangnan area?

(1) building water conservancy and turning wasteland into fertile land; (2) planting rice green manure; ③ Popularizing Niu Geng and organic fertilizer; (4) The establishment of the Beijing-Hangzhou Grand Canal connecting the north and the south has greatly facilitated the traffic between the north and the south.

I. Conditions and reasons: (1) The south is relatively stable and there are few wars; (2) Some rulers strive to get rid of disadvantages and develop production; (3) A large number of northerners moved south, bringing sufficient labor, advanced production technology, tools and fine varieties; (most important) (4) Jiangnan has superior natural conditions.

Second, performance: (1) agriculture: many water conservancy projects have been built, wasteland has been developed into farmland, green manure has been used, Niu Geng and manure have been popularized, and wheat and rice have been developed simultaneously, and land resources have been fully utilized. ⑵ Handicraft industry: The tapestry in Jiangnan has developed rapidly, and the firing technology of celadon in Jiangnan has reached a high level, and celadon has become people's daily necessities. The invention of cast steel is a great progress in metallurgical technology, and papermaking has also made new progress. ⑶ Business: The city was prosperous, and Jiankang was the most prosperous city at that time. Panyu became the center of overseas trade. 3. Significance: (1) has promoted the economic development in the south of the Yangtze River and created conditions for the economic center of China to move south; (2) It has promoted national integration, economic and cultural exchanges and social progress.

3. Significance: The development of the south of the Yangtze River has had a far-reaching impact on China's economy, laying the foundation for the gradual shift of the economic center of gravity to the south. The meaning of Jiangnan area in ancient literature is varied. It is often a word juxtaposed with regional concepts such as "Central Plains" and "Frontier", and it is ambiguous. Historically, Jiangnan is not only a natural geographical area, but also a social and political area. The present Jiangnan area refers to the area south of the middle and lower reaches of the Yangtze River and north of Nanling and Wuyishan. This area includes all of Zhejiang, Shanghai, Jiangxi and Hunan, as well as areas south of the Yangtze River in Jiangsu, Anhui and Hubei provinces. Compared with Jiangnan Road in Tang Dynasty, there are fewer parts involving Guizhou Province. Jiangnan area has a vast territory and diverse landforms, so it is often called "Jiangnan" now, which is roughly consistent with the meteorological scope of Jiangnan area. The three famous buildings in Jiangnan are all located in Jiangnan. This area includes three famous mountains, three rivers and three lakes-Qiantang River and Taihu Lake in Huangshan, Ganjiang River and Poyang Lake in Lushan, Xiangjiang River and Dongting Lake in Hengshan. These three rivers and lakes are the cradles of Wuyue culture, Ganpo culture and Huxiang culture respectively.