Five group II and five group III soybean [ Glycine max (L.) Merr.] cultivars released over a 50‐year period were grown at 12 location‐year combinations in the Midwest to evaluate genetic changes for seed yield, plant height, lodging, seed protein, and oil content and for phenotypic stability for seed yield. Current cultivars yielded 25% more seed than the original plant introductions in both maturity groups. Changes for the other characteristics were not consistent, however. Regression of cultivar means on environmental indices showed a consistent, linear increase in seed yield across the range of test environments, indicating equal stability for yield among the cultivars tested.
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Wilcox et al. (1979) studied this question.