Fig. 1. Mean daily temperature during the phenological period from the flowering of the first sunflower progeny (20 Jan., 24 Jan., 24 Jan. 1993, and 1 Aug. 1992 for Venado Tuerto., Daireaux, Balcarce, and Fargo, respectively). Curves represent results from individual locations Venado Tuerto (VT), Daireaux (DX), Balcarce (BA), Fargo (FA). The arrows represents 45 d after the flowering of the last family (as an estimation of the physiological maturity).

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