Total shoot number (A), total leaf area (B), fruit number (C) and total fruit dry weight (D) for observed (‘Fuji’ 42 and 47, dark bars) and simulated trees (‘Fuji’ 0, 1, 2 and 3, white bars). Total leaf area and total fruit dry weight were estimated at harvest. Observed trees correspond to two 4-year-old ‘Fuji’ trees digitized in 1998 (Experiment 1).