Fig. 7. Linear regression between GI of grains harvested 12 d after PM and incubated at 20°C, and mean air temperature occurred within the 300 to 350°C-day interval after anthesis (T_b = 5.5°C) for Q. Palomar cultivar sown on nine dates between 1996 and 1998. Regression equation: GI_12DAPM = 7.14 x T_m300-350 - 98.8 (r² = 0.95, P < 0.0001, n = 9; SE of estimate: 4.03; regression sum of squares = 2010.5; mean value of independent variable = 19.67). Inset shows association between DI and mean air temperature for the 300 to 350°C-day interval for 1997 experiments (P < 0.05). Vertical bars indicate SE.