Fig. 3. (a,b) Normalized percentage of plant population at three stages of pollen shed: beginning shed, maximum shed, and end shed for Pioneer 3978 (P3978; a) and Pioneer 3925 (P3925; b). (c,d) Measured pollen rates (symbols) and predicted pollen rates using the population index (lines) for hybrids P3978 (c) and P3925 (d). The population index was calculated using Eq. [3]. Vertical lines are standard errors of four measurements.

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