The first stage (1949- 196 1): At the same time, the farmland capital construction centered on water control and soil improvement was vigorously carried out, the farming systems such as changing single-season rice to double-season rice and changing indica rice to japonica rice were reformed, and advanced cultivation techniques were popularized, which played an important role in increasing rice yield.

The second stage (1962- 1979): continue to select and popularize excellent dwarf varieties, adopt corresponding optimized cultivation techniques, and resume and develop double-cropping rice production on the basis of transforming production conditions.

The third stage (1980 up to now): a series of high-yield combinations were prepared by "three lines" of hybrid rice and applied to production in a large area; The large-scale planting of rice in Northeast China has greatly increased the total rice output in China.

At the same time, from the study of single cultivation technology in the past to the utilization of the related growth laws between organs, some comprehensive high-yield and high-efficiency cultivation models have been created under different ecological conditions, which have played an important role in improving the yield per unit area of rice.

Development of rice industry in China since the 20th century.

Since the beginning of 2 1 century, the rice planting area and yield in China have generally increased. Since 2004, with the reduction of the previous backlog of rice stocks, China's rice planting area and output began to recover, accounting for 35% of the country's total grain output, ranking second only to corn. The average yield is 6743 kg/ha.

In 20 1 1 year, the national rice planting area was maintained at 30.057 million hectares, and in 20 12 year, the rice planting area was 30.297 million hectares, an increase of 0.7% over the previous year. In 20 13, the total planting area is expected to decrease slightly, and it will remain at 20 13 in 20 14.