Fig. 5. Kernel weight as a function of the amount of photosynthetic active radiation intercepted (IPAR) per kernel (A) and crop growth (CG) per kernel (B), during the effective grain-filling period. Data points represent the mean values of each treatment (plant population x row spacing x hybrid) in all experiments (Fig. 5A), and in E₂, E₃, and E₄ (Fig. 5B). Symbols as in Fig. 3. The solid lines indicate the models fitted to the data set. The dashed line indicates the 1:1 relationship between variables.