Abstract: Winter wheat lodging experiment was conducted during 2014-2015 by artificial stimulation. Three lodging treatments of 30o(T1), 60o(T2), 90o(T3) angle with the vertical direction were applied during heading stage, the early filling stage, and the middle and late filling stage. No lodging treatment was taken as control(CK). Dry matter (DM) distribution and yield components of winter wheat were investigated. The results indicated that DM distribution was altered due to lodging extend and lodging stage. Lodging at heading stage and the early filling stage decreasedDM accumulation rate, and accelerated DM translocation to panicle from stem and sheath. Leaf DM was altered later. By the corporate effect of insufficient solar radiation and altered transition rate, DM distribution in each organ varied rapidly and the growth rate of stem, leaf and sheath had no significant variation. The lodging at middle and late filling stage led a significant decrease of DM in all organs, and the decrease extent reduced to growth stages.The lodging treatment at heading stage and early filling stage decreased grain yield mainly due to the kernel number and 1000-kernel weight reduction, while middle and late lodging treatment decreased grain yield primarily due to the 1000-kernel weight reduction with a normally kernel number. The extent of yield reduction rate due to lodging was early filling stage > heading stage > middle and late filling stage.

Key words: Winter wheat, Lodging grade, Distribution pattern, Yield components