Abstract: Growing condition of soil moisture deficit was stimulated in shaded cement pit.Effects of water deficit and deficit extents at different stages of post-anthesis on chlorophyll fluorescence kinetics parameters and grain yield of maize were studied.Chlorophyll fluorescence kinetics parameters were clearly affected by the water deficit at different stages of post—anthesis.At 15 days after silking, the PSI]potential activity and Fv/Fm of maize ear leaves were both higher than 45 days after silking.With the extension water deficit duration, PSI]potential activity, Fv/Fm and qP values decreased gradually, while the gradual increase of qN values, is not conducive to the conversion of light energy, leading to lower yields.Short-term stress on the fluorescence was not obvious, and the decline of ear leaf pho— tosynthetie capacity was small.Grain yields were clearly affected by the water deficit at different stages of post—anthesis. In yield sequence as follow..water deficit between mid—filling stage and maturity stage(y3)>water sufficient through the whole growth period(T1)>water deficit between silking stage to mid-filling stage(T2)>water deficit between silking stage to maturity stage(T4).Compared with T1, the yield of T3 increased 3.5%, which is caused by the increase in thousand kernel weight；reduction in the yield of T2 was mainly due to the number of grains per spike decreased 3.9%；8-8 the number of grains per spike and grain weight were significantly reduced, the yield of T4 reduced 19.7%.

Key words: Post—anthesis, Water deficit kinetic, Parameters of chlorophyll fluorescence, Yield, Maize(Zea mays L.)

CLC Number: 

• S513.01