Fig. 4. Relationships between grain oil concentration and (A) kernel percentage, and (B) duration of grain filling, for nine sunflower hybrids grown in October (S1) and December (S2) sowing dates at Venado Tuerto during 1996-1997 and 1998-1999. Dashed arrows highlight some contrasting genotypic responses to S2, which underlie G x S interactions (Treatment 1, Triangles; Treatment 9, circles). For genotype groups (i.e., G1, G2, G3) see legend of Fig. 1.