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Fig. 4. (A) Relative kernel number per unit land area as a function of the relative amount of intercepted photosynthetic active radiation (IPAR) during the period around silking. Kernel number of each treatment was expressed as a proportion of the maximum kernel number recorded in each experiment (7460, 6053, 4181, and 4557 kernels m–2 for E1, E2, E3, and E4, respectively). The IPAR was also expressed as a proportion of the maximum IPAR registered in each experiment (218.6, 317.2, 343.7, and 357.6 MJ m–2 for E1, E2, E3, and E4, respectively). (B) Kernel number per square meter as a function of crop growth (CG) rate during the period around silking in E2. Data points represent the mean values of each treatment (plant population x row spacing x hybrid). Symbols as in Fig. 3. The solid lines indicate the model fitted to the data set.
