Fig. 8. (a) Linear relationship (r² = 0.77, P < 0.01, n = 20) between mean temperature for the 300 to 350°C-day interval and GI obtained for grains harvested 12 d after PM at validation sites (Cnel. Suárez and Puán, 370 and 450 km away from the FAUBA) and incubated at 20°C. Observations belong to plots of Q. Palomar cultivar sown on different dates or sites during 1998 for each location. The experimental model was developed at the Facultad de Agronomía (Universidad de Buenos Aires) with Q. Palomar sown on nine dates between 1996 and 1998. Slopes of both regression lines did not differ significantly (P > 0.20). (b) Linear relationship between GI of grains harvested 12 d after PM at validation sites and incubated at 6°C, and mean temperature for the 300 to 350°C-day interval (r² = 0.73, P < 0.05, n = 10). The experimental model predicts GI values for grains incubated at 20°C. Slopes do not differ significantly (P > 0.20). Vertical bars indicate SE.