China has a long history of planting rice. It is recorded in ancient books such as Guanzi and Lu Jiaxin Yu that "five grains" were sown in the Shennong era in the 27th century BC, and rice was listed as one of the five grains. The record of "Jade Age is beneficial to ordinary rice, so it can be planted in low humidity" in Historical Records Xia Benji shows that in the 20th century BC, our people began to struggle with nature, dredge the "Nine Rivers" and develop rice in the "low humidity" zone. About 4200 years ago, rice cultivation has been extended from the middle and lower reaches of the Yangtze River to the middle reaches of the Yellow River. In the Warring States period, due to the application of iron farm tools and plows, intensive cultivation was started, and large-scale water conservancy projects were built to develop rice, such as Zhangshui Canal in Hebei (445-396 BC), Dujiangyan in Sichuan (256 BC) and Zheng Guoqu in Shaanxi (246 BC). Terraced fields first appeared in Sichuan in the Western Han Dynasty. In 1930s, Qi Yao Min Shu written by Jia Sixie in the Northern Wei Dynasty was devoted to the cultivation techniques of rice and upland rice. During the Jin Dynasty, Guang Zhi also recorded the development of green manure, the increase of organic fertilizer sources and the improvement of paddy soil fertility. It reflects that the rice planting technology at that time had reached a certain level. After Wei, Jin, Southern and Northern Dynasties, the economic center of China gradually moved southward. During the Tang and Song Dynasties, Jiangnan became the national rice production center, and Taihu Basin was the rice production base. The rice needed by Beijing's military and civilians depends on Jiangnan water transport. At that time, due to the emphasis on water conservancy construction, reclamation of rivers and lakes, improvement of farm tools, soil fertility, double cropping of rice and wheat and variety renewal, a relatively complete planting and cultivation system had been initially formed in the rice-growing areas in the south of the Yangtze River. China is rich in rice seed resources. By the end of Ming Dynasty and the beginning of Qing Dynasty, there were more than 3,400 rice varieties in 223 counties of 16 provinces. In addition, new progress has been made in seedling raising and water and fertilizer management. 1949 since the founding of People's Republic of China (PRC), rice production has made great progress by using modern agricultural science and technology on the basis of inheriting and developing the fine tradition of intensive cultivation in the past. By 1984, China's rice planting area reached 33178,000 hectares, with an average yield of 5,370.0 kilograms per hectare, and the total rice output reached178.255 million tons, increasing by about 29% and 654.38+0.70 respectively compared with 1949.