[目的]为实现小麦优质高产节水省肥提供科学合理的水氮运筹模式.[方法]在大田条件下,研究灌水次数及施N时期对小麦旗叶Pn、叶绿素荧光参数及产量的影响.[结果]灌水次数对旗叶Pn、Fv/Fo、Fv/Fm、qP、qN及产量的影响均达到显著或极显著水平,且不灌水与灌水处理间差异较大;N肥全部基施与返青期追施(40%)处理间旗叶的Pn、Fv/Fo、Fv/Fm、qP和qN差异不大,但2个处理的光合参数与产量均明显低于拔节期或孕穗期追施(40%)处理.[结论]灌水次数与施N方式对Pn、叶绿素荧光参数及产量性状的调控存在显著的互作效应,其中以W,N处理组合效果最好.%[ Objective ] The aim was to provide a scientific and rational water, nitrogen model for achieving high yield, high quality of wheat and water and fertilizer saving. [ Method] Under the field conditions, the effects of irrigation frequencies and N application times on net photosynthetic rate (Pn), chlorophyll fluorescence parameters of flag leaf and yield of wheat was studied. [ Result] The differences on Pn, chlorophyll fluorescence parameters Fv/Fo, Fv/Fm, qP, qN of flag leaves and yield of wheat among different irrigation times had reached a significant level, and the difference between treatment without irrigation and irrigation treatments were relatively large; the difference on Pn, Fv/Fo,Fv/Fm, qP and qN between treatments of basal application of N fertilizer and N application (40％) in returning green stage was not significant, however, the photosynthetic parameters and yield of two treatments were obviously lower than that of N application (40％) in jointing stage or booting stage. [ Conclusion] The effects of irrigation frequencies and N application times showed significant interaction effects on photosynthetic characteristics of wheat flag leaves and yield, in which W2N4 treatment combination was best.
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