冬小麦茎秆的力学性质研究

对晋农190和北农48两个小麦品种的茎秆进行了力学测试,分别测取了不同生长期各节间的惯性矩、弹性模量及抗弯刚度,研究了两个品种在不同生长期各节间力学特性的变化趋势,并对两个品种的抗倒性进行了比较。研究表明:低部节间的抗弯刚度较大,有利于作物抗倒伏;蜡熟期茎秆抗弯刚度比乳熟期时小,这时容易发生倒伏;北农48比晋农190抗倒伏能力强。这些结论可为选择优种抗倒小麦提供理性支持。

A Study of the Mechanical Properties of Winter Wheat Stem

Wheat lodging is determined by the physical and mechanical properties of the wheat stems.In this paper,a series of experiments was performed to measure the physical and mechanical properties such as second moment of area,elastic modular and flexural rigidity of stem internodes at different stage of maturity about two varieties of wheat(Jinnong190 and Beinong48).By these research we can concluded: the second internode had the highest flexural rigidity which was advantage in resisting lodging;the flexural rigidity showed a decrease tendency with increasing maturity from the early dough to hard dough;the ability of lodging resistance of Beinong48 was stronger than Jinnong190.These results can give us some rational supports in choosing wheat variety with high quality and strong lodging resistance.