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Synchronous Pollination within and between Ears Improves Kernel Set in Maize

^a Cátedra de Cereales, Dep. de Producción Vegetal, Fac. de Agronomía, Univ. de Buenos Aires, Av. San Martín 4453, Buenos Aires (1417), Argentina
^b Dep. of Agronomy, Iowa State Univ., 1563 Agronomy Hall, Ames, IA 50011-1010 USA

View larger version (33K): [in a new window]   Fig. 1 Pattern of silk exsertion on apical ears of maize hybrids grown at Morris, MN (AP 162, AP 9191) and Salto, Argentina (DK 752, DK 664) at low (2.5 or 3.0 plant m-2) and high (7.5 or 9.0 plant m-2) plant populations. Data are the mean of 20 plants. Vertical bars represent ± the standard deviation

View larger version (31K): [in a new window]   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