播期对不同穗型冬小麦旗叶光合特性及产量的影响

以2个小麦品种(兰考矮早八C1;豫麦34号C2)为试验材料,在大田条件下研究了4个播期(10月6日,S1;10月16日,S2;10月26日,S3;11月5日,S4)对冬小麦旗叶光合性能及籽粒产量的影响。结果表明,籽粒灌浆前期旗叶SPAD值和净光合速率在不同播期间差异不明显,灌浆后期播期间差异增大,其中S1降幅最大,表明早播条件下小麦后期叶片衰老较快,影响光合产物的运转与积累。2个品种产量均以S1最低,S2最高。播期显著影响成穗数(P≤1%)和千粒重(P≤5%);2个品种相比,播期对兰考矮早八粒重的影响大于豫麦34号。

Effect of Sowing Date on Photosynthetic Characteristics of Flag Leaf and Grain Yield in Winter Wheat Cultivars with Different Ear-types

Field experiments were conducted to evaluate the effects of 4 sowing dates on net photosynthetic rate of flag leaf and grain yield of winter wheat. Two wheat cultivars, Lankao Aizao 8 and Yumai 34, were used in the experiment. The result indicated that there was little difference in values of SPAD and Pn among the treatments of sowing date in early grain filling stage, but significant differences were found in late grain filling stage, of which treatment S1 decreased the most. This suggested that early sowing of wheat resulted in earlier leaf senescence, so as to depress the dry matter accumulation in late developmental stage. Sowing dates also affected the grain yield and its components, the highest and lowest grain yield being from the treatment S2 and S1 respectively. And significant effect of sowing date on spike number (P≤1%) and 1000-grain weight (P≤5%) were observed. The effect of sowing date on grain weight was was much greater in Lankao Aizao 8 than in Yumai 34.