Abstract: In order to investigate the impacts of air temperature and precipitation on the growth stages of winter wheat and rice,the climate and crop phenophase datasets in typical agricultural zones of Jiangsu province were analyzed.The climate datasets are composed of the air temperature and precipitation data from 1992 to 2005 in Xuzhou,Kunshan and Yixing.The phenophase datasets are composed of the recorded main growth stages of winter wheat in Xuzhou and Kunshan from 1992 to 2004 and rice in Xuzhou and Yixing from 1993 to 2005.The results indicated that the whole winter wheat growth period shortened by the increase in mean air temperature.There was no significant corelation between the winter wheat growth period and precipitation.With the increase in mean air temperature,the stages of stem elongation,booting and flowering of winter wheat tended to be earlier,while the stage of milking maturity tended to be later.No significant relationship between winter wheat growth stages and precipitation were observed.Further investigations indicated that there was no significant relationship between the whole rice growth period and mean air temperature or precipitation.The stages of stem elongation,booting,heading and maturing of rice showed no significant change with the increase in mean air temperature.These results indicated that the variations in air temperature significantly affected the growth stages of winter wheat rather than that of rice.

Key words: Air temperature, Air temperature, Precipitation, Winter wheat, Rice, Growth stage