Fig. 2 Nitrogen use efficiency (NUE) and harvest index (HI) of a historic series of cultivars; average for three levels of N (75, 150, and 300 kg ha^-1), northwestern Mexico, 1987 through 1989 (adapted from Table 3 in Ortiz-Monasterio et al., 1997). (LSDs [0.05] are 3.0 kg yield kg^-1 N for NUE, and 2.5% for HI.)

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