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Model Concepts to Express Genetic Differences in Maize Yield Components

Dep. of Crop and Soil Sci., Michigan State Univ., East Lansing, MI 48824-1325

View larger version (24K): [in a new window]   Fig. 1. Relationship between kernel per apical ear and cumulative intercepted photosynthetically active radiation (CIPAR) during period bracketing silking (327°C days). Symbols indicate observed data, and curves indicate modeled response using Eq. [1] and [2] (see text for details). Observed data are from Tollenaar et al. (1992) for maize hybrids Pride, Pioneer 3978, and Pioneer 3851; from Iowa (Murrell and Childs, 2000) for Pioneer 34G82; and from Otegui and Bonhomme (1998) for six hybrids.

View larger version (30K): [in a new window]   Fig. 2. Relationship between kernel number per apical ear or per plant and cumulative intercepted photosynthetically active radiation (CIPAR) during critical window bracketing silking. Data points are from Andrade et al. (1999) and for Pioneer 3902 from Tollenaar et al. (1992). Open symbols indicate kernel number in apical ear (KN1) and closed symbols kernel number from both apical and secondary ears (KN2). Continuous lines are for Andrade et al. (1999) data and broken lines for Tollenaar et al. (1992) data. Thin lines are for KN1 and thick lines for both KN1 and KN2 (see the text for details).

View larger version (24K): [in a new window]   Fig. 3. Relationship between fraction of ear-bearing plants and cumulative intercepted photosynthetically active radiation (CIPAR) during the period bracketing silking (327°C days). Symbols indicate observed data, and lines indicate modeled response using Eq. [5].

View larger version (20K): [in a new window]   Fig. 4. Relationship between plant density and simulated yield by original (broken line) and revised (solid line) CERES Maize model. The top two curves are for simulated yield for the Iowa site in 1999, and the bottom two curves are for the hybrid Pride 5 from Ontario site in 1989. The symbols represent observed yield. The closed symbols are for the Iowa maize yield contest (the year of contest in parenthesis), and open symbols are for Pride 5 in Ontario, Canada (Tollenaar, 1992).