播种密度对扬农啤5号叶面积指数的影响

目的]研究不同播种期、播种密度对扬农啤5号叶面积指数的影响。方法]采用分期播种和数理统计等方法。结果]从播种到拔节期,播种密度越大,叶面积指数越大。从齐穗期开始,密度在120万~300万株/hm2,叶面积指数随着密度的增加呈直线上升;密度在300万~360万株/hm2,叶面积指数随着密度的增加呈直线下降。结论]倒3叶对产量和品质影响很大,所以齐穗期叶面积指数大,对提高产量和品质是有利的。据此可见,扬农啤5号播种密度在300万株/hm2左右是比较理想的。

Effects of Sowing Density on the Leaf Area Index of Yangnongpi No.5

Objective] The research aimed to study the effects of different sowing stage and sowing density on the leaf area index of Yangnongpi No.5.Method] The methods such as interval sowing and mathematical statistics were used in the test.Result] The greater sowing density from the sowing stage to the jointing stageis,the greater the leaf area indexis.From the full heading stage,the density was 1 200-3 000 thousand plants/hm2 and the leaf area index showed a linear increasing trend with the increasing of density.When the sowing density was 3 000-3 600 thousand plants/hm2,the leaf area index showed a linear decreasing trend with the increasing of the density.Conclusion] The effects of the top three leaves on the yield and quality were greater.Greater leaf area index in full heading stage was favorable for increasing the quality and yield.So the ideal sowing density of Yangnongmai No.5 was about 3 000 thousands plants/hm2.