Results from significance tests (Wald F-statistics, with associated significance probabilities given in parenthesis) for the interaction of the regional-level ADD, REC or HET effects with trial site.

For each age (i.e. 2, 4, 9 or 13years from planting), the results are based on an across-site analysis that was conducted by combining breast-height diameter (DBH) data measured at the Geeveston and Weilangta trial sites.DD = net difference between the additive effects of the genes in the intra-regional ♀N♂N and ♀S♂S crosses.REC = overall reciprocal effect (confounding maternal and non-maternal reciprocal effects at theregional level).HET = total mid-parent heterosis attributed to both inter-regional ♀N♂S and ♀S♂N hybrids.