扬农啤5号苗情对粒叶比的影响

Effect of Seedling Condition of Barley on Grain-leaf Ratio

[目的]研究大麦苗情对粒叶比的影响。[方法]以大麦品种扬农啤5号为材料，研究不同播期（10月15、22、29日和11月5、12日）和不同种植密度（120万、180万、240万、300万和360万株/hm^2）下大麦苗情对粒叶比的影响。[结果]扬农啤5号粒叶比与基本苗数呈抛物线关系，当基本苗为250万株/hm^2时，粒叶比最小。粒叶比与各生育阶段总苗数呈周期性振荡关系，且随着冬前期、越冬期和拔节期总苗数的增加而减小，随着返青期总苗数的增加而增大，当冬前期总苗数在270万-320万株/hm^2、返青期总苗数在640万-820万株/hm^2时，粒叶比较高。[结论]大麦总苗数对其粒叶比有一定影响，冬后做好促个体、控群体工作有利于提高其粒叶比，从而提高其产量和品质。

[Objective] The study aimed to research the effect of seediing condition-of barleyon on grain-leaf ratio. [ Method] With barley va- riety Yangnongpi 5 as material, the effect of its seedling condition on grain-leaf ratio was studied under different sowing dates （October 15, 22, 29 and November 5, 12） and different planting densities （1 200 000, 1 800 000, 2 400 000, 3 000 000 and 3 600 000 plants/hm^2）. [ Result] The grain-leaf ratio of Yangnongpi 5 showed a parabola relation to the basic seedling number, and it was smallest when the basic seedling number was 2 500 000 plants/hm^2. The grain-leaf ratio showed a periodic oscillation relation to total seedling number in each growing stage, it was decreased with the increasing of total seedling number in earlier winter stage, wintering stage and jointing stage and was increased with the increasing of total seedling number in turning green stage. The grain-leaf ratio was bigger when the total seedling number was 2 700 000 - 3 200 000 plants/hm^2 in earlier winter stage and was 6 400 000 - 8 200 000 plants/hm^2 in turning green stage. [ Conclusion] The total seedling number of barley had certain effect on the grain-leaf ratio. It was beneficial to increase the grain-leaf ratio of barley when promo- ting individual and controlling population work was better done after winter, thus increase its yield and quality.