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Genotypic Variability in Morphological and Physiological Traits among Maize Inbred Lines—Nitrogen Responses

^a Dpto. de Producción Vegetal, Facultad de Agronomía, Universidad de Buenos Aires. Av. San Martín 4453 (C1417DSE), Ciudad de Buenos Aires, Argentina
^b Instituto Nacional de Tecnología Agropecuaria (INTA), Estación Experimental Agropecuaria Pergamino, Buenos Aires, Pergamino

View larger version (28K): [in a new window]   Fig. 1. Solar radiation (A) and mean air temperature (B) evolution in two growing seasons (Exp. 1: 2000–2001; Exp. 2: 2001–2002). Data are presented as a function of thermal time from sowing (base temperature 8°C). The horizontal line indicates the mean flowering period of the experiments.

View larger version (17K): [in a new window]   Fig. 2. Relationship between leaf area per plant and the number of ligulated leaves of inbred lines cropped at two N levels (HN and LN) during two experimental years (Exp 1 and Exp 2). Different fitted curves represent significantly (P < 0.05) different responses of leaf area production: (A) between N levels (inbred LP611), (B) between N levels and experiments (inbred ZN6), with maximum plant leaf area of HN Exp 2 > HN Exp 1 = LN Exp 2 > LN Exp 1, and (C) between N levels and experiments (inbred LP521), with maximum plant leaf area of HN Exp 2 > HN Exp 1 > LN Exp 2 = LN Exp 1.

View larger version (26K): [in a new window]   Fig. 3. Relationship between (A) Kernel number per plant and prolificacy, (B) Harvest index and kernel number per plant, and (C) Kernel number per plant and the anthesis silking interval. Data correspond to 12 inbred lines cropped at two N levels (HN and LN) during two experimental years (Exp. 1 and Exp. 2).

View larger version (20K): [in a new window]   Fig. 4. Relationship between kernel number per plant and plant growth rate of individual tagged plants of genotypes P578 (A) and LP2 (B).