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研究了在超高产条件下，不同生育时期追施氮肥对超高产小麦光合特性和产量的影响．结果表明，拔节期、孕穗期追氮有利于延缓小麦生育后期旗叶中 Ｃｈｌ含量、Ｐ_ｎ与 ＲＵＢＰｃａｓｅ活性及植株 ＬＡＩ， ＣＡＰ的下降速率．拔节期追肥较其它时期追肥产量构成因素较为协调，产量最高；孕穗期追肥能明显增加粒重与粒数，增产效果也十分显著；返青期追肥由于粒重较低，产量略高于氮肥全部底施．
The effects of topdressing nitrogen fertilizer on the photosynthetic characteristics and yield of super-high-yielding wheat under different high yielding stages were studied under super high yielding conditions. The results showed that nitrogen addition at jointing stage and booting stage delayed the decrease of Chl content, P_n and RUBPcase activity in flag leaves and the decreasing rate of LAI and CAP in the late stage of wheat growth. The topdressing dressing at the jointing stage was more coordinated than the top dressing at other stages, with the highest yield. Top dressing at the booting stage could increase the grain weight and grain number significantly, and the yield increase was also significant. Because of the lower grain weight, Shi.