| Early, individual-tree selection procedures and current growth-and-yield models may not be accurate, because they do not include genetic differences in competitive ability. This project evaluates effects of families and tree conformations (ideotypes) on such procedures and models. A "check" and families representing several growth-rate-plus-crown-size were planted at three spacings. Predictive functions for family and ideotype effects were developed and inserted into a growth-and-yield model.; Family differences in stem profile and competitive ability influenced growth-and-yield projections. Ideotype classifications did not adequately describe their family effects. Adjustments must be family based, rather than ideotype based. Stem profile and density adjustments had large effects, while dominant height did not. It was concluded that progeny tests at closer spacings could improve early selection, since crown closure occurs earlier and allows evaluation of competitive ability. |
