Pearson correlation coefficients are shown in the table.*, P < 0.05; **, P < 0.01. Abbreviations: H, average height; Nu, number of plants; SPAD, SPAD values; LWC, leaf water content; SLA, specific leaf area; LA, leaf area; LT, leaf thickness; Lpnu, pitch number; Lpih; internode height; and BSD, shoot basal diameter.