Table 1.

Parameters of the Richards' functions representing the relationship between the leaf blade length (L_max) and the maximum leaf width (W_max) shown in Fig. 2

Parameters	Main stem	Tiller	Flag leaf
Wp	12·5	12·5	12·5
b	16·19	−1·79	−4·14
c	0·0424	0·00752	0·0152
d	10·96	0·0934	0·00647
RMSE	0·102	0·073	0·113
R2	0·96	0·95	0·46
n	59	119	51

The function is expressed as: W_max = W_p/[1 + exp(b − cL_max)]^1/d

R², coefficient of determination; RMSE, root-mean-squared error = {[Σy_i − f(x_i)]²/n}^1/2, where f(x_i) is calculated value from the function, y_i is the observed value, n is the number of samples.