小麦发育后期茎秆抗倒伏性模型研究

为了解决高产小麦发育后期"茎倒"这一问题,首先研究小麦发育后期的抗倒伏性能,针对不同品种小麦茎秆性状得出其抗倒伏指数公式,对于缺失数据,利用杠杆原理对小麦茎秆分割求和,将数据补充完整。其次,采用灰色系统相关性理论,对原始数据进行无量纲化处理,得出小麦抗倒伏指数与茎秆性状之间的相关性。最后,考虑小麦在麦穗自重和风载作用下应力时,引用惯性矩、抗弯刚度等力学相关理论建立小麦抗倒伏的力学模型,以2007年数据为例,求得各品种小麦腊熟期的抗倒伏风速,验证所建模型的合理性。

Study on Stem Lodging - resistance of Wheat Later Development

In order to solve the later period of the development of high - yielding wheat ＂stem down＂ problem. The first study was wheat development of the late lodging - resistance performance, then we got lodging - resistance index formula for different varieties of wheat stem traits. We could obtain the missing data by the usage of leverage on wheat stem. Secondly, the use of gray system theory and dimensionless processing draw a correlation between the wheat lodging - resistance index and stem char- acters. Finally, considering the weight and wind loads under the stress of wheat, we got the mechanical model of wheat lodging -resistance with the reference of moment of inertia, bending stiffness and other mechanical theories. Based on the data of 2007, we obtained all varieties of wheat ripe stage lodging - resistance wind speed and verified that the model is reasonable.