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Frequency Dependent Stability of Performance in Oats¹

‘Blount’ and ‘Forkedeer’ oats (Avena sativa L.) were studied in pure stands and two-way mixtures with 25, 50, and 75y0 of each variety in 10 environments at four locations for 3 years. Four experimental lines were also included as pure stands. The grain yields of the mixtures were slightly higher and lodging percentages were significantly higher than predicted from the performance of the components. Stability was measured as repression and deviations from regression of population performance on environmental productivity and as the proportion of the populations x environments variance. The mixtures were judged more stable than Blount or Forkedeer. Frequency dependency of stability for yield was indicated since the populations became increasingly more stable as the frequency of Blount was increased in the populations. The 75% Blount-25% Forkedeer population offered advantages of stability with only slightly lower grain yield than Blount, the higher yielding variety.

Key Words: Genotype-environment interaction • Avena sativa L. Oat breeding • Varietal mixtures

² Present addresses: Dept. of Agronomy and Range Science, University of California, Davis, Calif. 95616; and Dept. of Agronomy and Plant Genetics, University of Minnesota, St. Paul, Minn. 65101, respectively.

Received for publication January 19, 1970.