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Mixtures of Hard Red Winter Wheat Cultivars¹

Four hard red winter wheat (Triticum aestivum L. em. Thell.) mixtures of three components each, two of adapted cultivars and two of similar phenotypic strains, were studied with component lines for 7 years at two locations. Equal portions of three adapted cultivars or similar phenotypic strains were used to form an original mixture the first year and a reconstituted mixture in succeeding years. Components of each mixture were selected to allow ease of identity to ascertain what ratio changes occurred in a mixture. Yield, test weight, and ratio change were the characteristics evaluated. Data indicate that the annually reconstituted mixture was more stable in performance than the original mixture or the component strains. Year-to-year variation apparently can be reduced by employing annually reconstituted mixtures. However, the average performance of mixtures of adapted cultivars or mixtures of similar phenotypic strains was not superior to that of the best component.

² Former graduate student, agronomist, and research assistant, Agronomy Department, Kansas State University.

Received for publication June 26, 1965.