What are the main technologies of water-saving irrigation for rice?

China attaches great importance to water-saving irrigation technology for rice. At present, under different natural conditions, through experimental research, according to the growth stage of rice and the supply of irrigation water, several new water-saving high-yield and efficient irrigation technologies for rice have been put forward, which have been widely used in production, and some water-saving irrigation technologies are still under study. At present, the water-saving irrigation methods are: shallow wet sun shallow wet irrigation technology; Intermittent irrigation technology; Shallow wet irrigation technology; Shallow dry-wet irrigation technology; Dry farming irrigation technology of rice without water layer.