Agronomic Changes from 58 Years of Genetic Improvement of Short‐Season Soybean Cultivars in Canada

Yield progress of short‐season soybean [ Glycine max (L.) Merr.] cultivars in Canada has been approximately 0.5% per year since the early 1930s. Our objective was to identify changes in agronomic traits associated with yield increase within a selection of historical cultivars. Where applicable, we measured phenotypic stability of these traits. At Ottawa, ON, we grew 14 cultivars, representing seven decades of breeding and selection (1934–1992),...