Fig. 4. Relationships between (A) oil-corrected biomass between anthesis and physiological maturity and (B) harvest index and the time elapsed between anthesis and physiological maturity, 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 (Genotype 1, triangles; Genotype 9, circles). For genotype groups (i.e., G1, G2, G3) see legend of Fig. 1.