Fig. 2 Relationship between kernel number on sub-apical ears (E2) and the silking interval between apical (E1) and sub-apical (E2) ears of four maize hybrids. Plants were grown at 2.5 (AP 162 and AP 9191) or 3 plants m-2 (DK 752 and DK 664), and subjected to natural pollination as silks emerged, or to synchronous hand pollination five days after first silks appeared on E1. The ear silking interval is the number of days between first silk appearance on E2 and E1. At least 20 plants were included in each hybrid x plant population x pollination treatment
