Fig. 5. The proportion of the difference in kernel no. plant^–1 (KN_P) between the inbred line CG60 and the hybrids (a) CG60 x CG102 and (b) CG60 x MBS1236 that is associated with ear growth rate during the period bracketing silking (EGR_S). Open symbols indicate values of KN_P and EGR_S at a PGR_S interval from 0.1 to 0.2 g plant^–1 GDD^–1 (GDD = growing degree-day; and for CG60 and the hybrids, respectively). Closed symbols indicate values of KN_P and EGR_S at a PGR_S interval from 0.3 to 0.4 g plant^–1 GDD^–1 ( and for CG60 and the hybrids, respectively). The total difference in KN_P between the inbred line CG60 and the hybrid is equal to AC and the proportion of the difference in KN_P that is associated with the difference in EGR_S is equal to AB/AC.