Fig. 3. Simulated and observed time to maturity (day of the year) and yield (kg ha–1) of seven soybean public varieties grown at eight locations and 5 yr in Illinois (1995–1999). Regression equations for time to maturity, y = –50.7 (± 9.7) + 0.8x (± 0.04), R2 = 0.75; and yield, y = 689 (± 192) + 0.77x (± 0.07), R2 = 0.54. Time to maturity and yield RMSE were 5.2 (days) and 393 (kg ha–1), respectively. Yield RMSE is 12.3% of the average observed yields.