Analysis on the effect of drought on the grain weight grow and the character of the grain filling of winter wheat

Under the water stress,the grain filling processes of six dominant winter wheat varieties planted in the west of Henan province were modeled with Logistic equation and a series of inferior parameters were conducted. The relationship between grain filling parameters and grain weights was analysed using correlation and stepwise regression. The results showed that the mean grain filling time of winter wheat was shortened while the mean grain filling rate was increased correspondingly. Grain filling rate affected grain weight significantly, but grain filling duration didn't relate to the grain weight significantly. It was very important to increase grain filling rate for us to increase grain weight.