Fig. 7. Fertile culm number per emerged culm vs. maximal green leaf area of that culm, for the main culm and each tiller type of sorghum grown at two (circles), four (upward pointing triangles), eight (squares) and 16 (downward pointing triangles) plants m^–2. In cases where tillers were not fully fertile, green leaf area included that of senescent tillers as it was not practical to separate senescent tillers from others with the same node of origin during destructive harvests. Vertical lines represent s.e.m. of three replications.