Influence of Different Irrigation Modes on Spike Traits and Grain Yield of Winter Wheat

With the split plot design,the grain yield and main stem panicle traits of six winter wheat varieties were studied under three irrigation modes,to explore the effect of irrigation modes on the panicle traits of winter wheat and the relationships between different traits and grain yield.The results showed that the spike length of main stem,length of spike neck,diameter of spike neck,grain number per spike and grain yield of winter wheat were not significantly different among different irrigation modes,indicating that the influence of irrigation modes on spike characters of winter wheat was less than that of genetic factors,and the genetic factors had the decisive role to ear characters.The grain yield of wheat had positive correlation with grain number per spike(y=4.873 93+0.001 39x).The grain number per spike had negative relation with the spike length(y=86.184 9-4.292 84x),but was positively related to the diameter of spike neck(y=2.567 15+0.014 55x)and the length of spike neck(y= 32.731 05+0.619 15x).In all the combinations,the highest yield(8 175kg/ha)came from the wheat variety Shaan 538with the bottom irrigation mode.