一、引言小麦的倒伏、是关系到小麦产量进一步提高的一个关键性问题。在高肥、密植和灌溉条件下,防止倒伏,以发挥小麦的生产潜力,就成为迫切需要解决的问题。小麦倒伏,不仅使产量和品质降低,也影响机械收获的进行,给生产造成一系列的损失和困难。已有的资料证明,小麦倒伏后,一般减产25—30％,严重者在50％以上,且倒伏发生越早,减产也越严重,(Волков,1939;Ральченко,1940;Савицкий,1948;Ско- I. INTRODUCTION The lodging of wheat is a key issue that concerns the further improvement of wheat yield. Under conditions of high fertility, close planting and irrigation, preventing lodging and bringing the potential of wheat into full play has become an urgent problem to be solved. The lodging of wheat not only reduces the yield and quality but also affects the progress of mechanical harvesting, causing a series of losses and difficulties in production. The available data prove that after the wheat lodging, the general reduction of 25-30%, severe in more than 50%, and the lodging of the earlier, the more serious the reduction, (Волков, 1939; Ральченко, 1940; Савицкий, 1948; Ско-