小麦倒伏一般发生在抽穗之后。这一时期麦株茎基部细胞组织的木质化程度较差,机械组织不发达。如果基本苗过多、群体过大,施肥过量,特别是拔节肥施得过猛,致使无效分蘖过多,叶面积过大,通风透光不良,光合强度降低,同化产物相应减少,因而节间细长,茎秆强度降低,若遇到风雨交加的恶劣天气,地上部分重 The lodging of wheat generally occurs after heading. During this period, the stem cells at the base of wheat plants had poor lignification and underdeveloped mechanical tissues. If the basic seedlings too much, the group is too large, excessive fertilization, especially jointing fertilizer too much, resulting in excessive tillering, leaf area is too large, poor ventilation and light, reduced photosynthetic products, assimilation products corresponding reduction Slender, stems reduce the intensity, if faced with bad weather, heavy on the ground