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Yield and Stability of Yield of Barley Populations¹

Yield and stability of yield were studied in two sets of barley (Hordeum vulgare L.) populations. Each set consisted of three distinct levels of genetic diversity: homogeneous varieties, simple mechanical mixtures, and complex mixtures (bulk hybrids). Both sets were grown in rod-row trials at two locations for 5 years. As a group, the simple mixtures were slightly higher yielding than varieties or complex mixtures. Varieties yielded more than complex mixtures in set 1, but not in set 2. The highest yielding entry in set 1 was Traill, and in set 2 the high entries were Liberty and a mixture involving Liberty. In general, the mean of component lines and the mean of parental varieties provided a good estimate of the yields of the simple and complex mixtures, respectively.

Varieties and simple mixtures were judged to be similar in stability and both were somewhat less stable than complex mixtures. However, differences among entries within each of the diversity groups were relatively large and preclude definite conclusions regarding the relationship between level of genetic diversity and stability.

Key Words: Hordeum vulgare L. • varieties • genetic diversity • variety mixtures

² Professor in Agronomy and Plant Genetics, University of Minnesota, St. Paul, Minn. 55101.

Received for publication January 29, 1970.