Fig. 1. Sensitivity study on the critical photoperiod (P_C) above which photoperiod extends the time to first flower. The standard error of estimate (SEE) of the model (Eq. [7]) fit to the data is plotted against P_C. The solid line is Y = 51.41 - 7.128X + 0.2642X² with a minimum at 13.5 h (R² = 0.98).

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