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Fig. 1. Relationships between oil yield and (A) grain number per square meter, (B) grain weight, and (C) grain oil concentration, for nine sunflower hybrids grown in October (S1) and December (S2) sowing dates at Venado Tuerto during 1996-1997 and 1998-1999. Values are means of the 2 yr. Dashed arrows highlight some contrasting genotypic responses to change from S1 to S2, and which underlie G x S interactions (Treatment 1, triangles; Treatment 9, circles). Genotype groups derived from cluster analysis of a multienvironment trial (de la Vega et al., 2001), i.e., G1: Northern adapted, G2: Central adapted, G3: broadly adapted. See Table 1 in de la Vega and Hall (2002) for genotype group membership.
