Mid-parent heterosis (MPH in %) was calculated as difference between hybrid performance (F1) and the mean value of the two parents [MP = (P1 + P2)/2] for end-point biomass, projected leaf area, estimated biovolume, and early plant height at all time points with available data (Eq. 4). Best-parent heterosis (BPH in %) was calculated as difference between hybrid performance (F1) and the better performing parent (Eq. 5).
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