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Figure 2. Fits of a trisegment linear regression model to the triphasic V-stage data shown in Fig. 1 for the four planting dates in 2003 (solid lines) and 2004 (dashed lines). The vertical lines denote the coincident day after planting (DAP) values for V1 and some key R stages. Estimates for all five model parameters and the DAP values for all R stages, are listed in Table 2. The text boxes show the average air temperature (°C) in 2003 (top number) and 2004 (bottom) during the time intervals demarked by the V1, R1, and R5 vertical lines. The horizontal line denotes the stem node number coincident with the peak center parameters of the internode length models (Fig. 4).
