The growth dynamics of root characters werestudied with the mediod of mathematical model that was a little different The results showedthat root characters of early growth showed QUB (Y=b0+b1t+b) S (Yo+biIt~)andCUB(Y=bo+btt+bzt+b3t3) curve patter.

• 11种早熟禾苗期根系性状最优生长动态拟合方程有所差异，拟合模型有三种QUB（Y=b_0+b_1t+b_2t~2）、和CUB（Y=b_0+b_1t+b_2t~2+b_3t~3）模型。