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  1. Vol. 10 No. 4, p. 386-389
     
    Received: Jan 19, 1970
    Published: July, 1970


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doi:10.2135/cropsci1970.0011183X001000040022x

Frequency Dependent Stability of Performance in Oats1

  1. C. O. Qualset and
  2. R. M. Granger2

Abstract

Abstract

‘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 ✕ 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.

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