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Why Do Maize Hybrids Respond Differently to Variations in Plant Density?

^a Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) and Unidad Integrada Balcarce, Instituto Nacional de Tecnología Agropecuaria (INTA)–Facultad de Ciencias Agrarias, Universidad Nacional de Mar del Plata (UNMdP), Ruta Nacional 226 km 73.5, C.C. 276, 7620 Balcarce, Buenos Aires, Argentina
^b AACREA. Bolivar 710, Tandil (7000), Buenos Aires, Argentina
^c Dep. of Crop, Soil and Environmental Sciences, Univ. of Arkansas, 1366 Altheimer Dr., Fayetteville, AR 72704, USA

View larger version (13K): [in this window] [in a new window]   Fig. 1. Grain yield (g m–2) as a function of plant population density (plants m–2) for hybrids KWS Romario, Pioneer 37P73, and Dekalb 688 in 2 yr (2000 and 2003). Quadratic equations were fitted to the data.

View larger version (14K): [in this window] [in a new window]   Fig. 2. Total aboveground biomass per plant (g plant–1) as a function of plant population density (plants m–2) for KWS Romario, Pioneer 37P73, and Dekalb 688 in 2 yr (2000 and 2003). Parameters and coefficients of determination (r2) of the exponential equations are presented in Table 1.

View larger version (18K): [in this window] [in a new window]   Fig. 3. Grain yield per plant (g plant–1) as a function of total aboveground biomass per plant (g plant–1) for KWS Romario, Pioneer 37P73, and Dekalb 688 in 2 yr (2000 and 2003). The solid lines are the hyperbolic fit. Parameter and coefficients of determination (r2) of the hyperbolic equations are presented in Table 2.

View larger version (20K): [in this window] [in a new window]   Fig. 4. Harvest Index as a function of total aboveground biomass per plant (g plant–1) for KWS Romario, Pioneer 37P73, and Dekalb 688. The functions were derived from the hyperbolic fit in Fig. 3.