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Vertical Profile of Leaf Senescence during the Grain-Filling Period in Older and Newer Maize Hybrids

^a Inst. Nacional de Tecnología Agropecuaria, EEA Paraná Ruta 11 km 12.5 (3101), Oro Verde, and Univ. Nacional de Entre Ríos, Facultad de Ciencias Agropecuarias, CC 24 (3100) Paraná, Entre Ríos, Argentina
^b Univ. of Guelph, Dep. of Plant Agriculture, Guelph, ON, Canada N1G 2W1

View larger version (29K): [in a new window]   Fig. 1. Percentage of senescence as related to nodal position at 7 (squares), 26 (triangles), and 51 (circles) d after silking in ‘Pride 5’ (A, D, G), ‘Pioneer 3902’ (B, E, H), and ‘Pioneer 3893’ (C, F, I) grown at three plant population densities in 1999: 1 plant m–2 (A, B, C), 3.5 plants m–2 (D, E, F), and 12 plants m–2 (G, H, I). The LSD (0.05) to compare leaves within each plant population density is 15.9.

View larger version (30K): [in a new window]   Fig. 2. Percentage of senescence as related to nodal position at 7 (squares), 24 (triangles), and 48 (circles) d after silking in ‘Pride 5’ (A, D, G), ‘Pioneer 3902’ (B, E, H), and ‘Pioneer 3893’ (C, F, I) grown at three plant population densities in 2000: 1 plant m–2 (A, B, C), 3.5 plants m–2 (D, E, F), and 12 plants m–2 (G, H, I). The LSD (0.05) to compare leaves within each plant population density is 11.4.

View larger version (30K): [in a new window]   Fig. 3. Percentage of senescence as related to nodal position at 11 (squares), 34 (triangles), and 59 (circles) d after silking in ‘Pride 5’ (A, D, G), Pioneer 3902 (B, E, H), and Pioneer 3893 (C, F, I) grown at three plant population densities in 2001: 1 plant m–2 (A, B, C), 3.5 plants m–2 (D, E, F), and 12 plants m–2 (G, H, I). The LSD (0.05) to compare leaves within each plant population density is 16.9.