国家重点研发计划项目（2018YFD0301305; 2017YFD0301402; 2016YFD0300503）； 湖北省技术创新专项重大项目（2018ABA078）； 湖北省自然科学基金项目（2017CFB336）； 湖北省农业科学院青年基金项目（2018NKYJJ01）
Four sowing dates were set under machine transplantation and five japonica varieties were used to study the yield,growth period,quality,utilization of temperature and light resources of japonica rice varieties,clarify the ecological adaptability of japonica varieties in different japonica wheat production areas of Hubei Province and promote “transition from cultivating indica to cultivating japonica in Hubei Province” The results showed that the growth period of the varieties tested was shortened and the growth process was accelerated when the sowing date was postponed. The yield decreased to varying degrees. The utilization rate of accumulated temperature and the utilization rate of sunshine hours in the whole growing period showed a downward trend. The suitable types and sowing dates of three japonica areas in the three japonica wheat areas were preliminarily determined based on the conditions of temperature and light resource and the time of wheat stubble removal in the three japonica wheat production areas. The suitable japonica varieties in Xiangyang are early/intermediate maturing medium japonica with short growth period. The suitable varieties in Xiaochang are early/intermediate maturing medium japonica. The suitable varieties in Jiangling are early/intermediate maturing medium japonica and early maturing late japonica. They can exert the best yield potential.