Abstract: On the basis of analysis on wheat grain filling and grain growth,the concept of grain filling degree and the related formula were suggested.Also the grain filling models were studied.It is suggested that there are significant differences in grain filling degree among the varieties used and the grain filling degree represents the effect of the grain growth potential .The grain filling models of the high yield wheat varieties in Henan provinces were divided into four types:(1)higher grain filling rate combined with shorter grain filling duration;(2)longer grain filling duration combined with early flowering;(3)longer grain rilling duration combined with later flowering;(4)lower grain filling rate combined with longer grain filling duration.The first two types were most suitable for the ecological condition of Henan province.Their grain filling degrees are higher than others.The grain filling degree is closely related to grain filling duration,the ending date of grain filling,the flow ering date and the initial growth potential.

Key words: Wheat, Grain filling degree, Grain filling model

CLC Number: 

• S512.101