Effects of Nitrogen Application on Photosynthesis Rate and Yield of Winter Wheat

Effects of nitrogen fertilizer application on photosynthesis rate and yield of wheat were investigated in the experiments including photosynthesis of flag leaf and yield. For yangnong?15, the nitrogen application in jointing stage increased the number of ear per hm 2, the number of grain per ear and enhanced the photosynthesis of flag leaf.For 935031, the nitrogen application at anthesis added the werght of grain significantly and prolonged the period of photosynthesis function.