Fig. 1 Grain yield of a historic set of wheat cultivars developed in northwestern Mexico (1962–1996): For cultivars from 1962 through 1988 (open circles) yields are means of six growing seasons (from Sayre et al., 1997), while the latest two dates (closed circles) are based on data from 1997 to 1998 (Table 2) after adjustment based on the performance of common entries (i.e., Seri 82 and Bacanora 88). (Equation of line [1962–1988] )

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