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Statistical Analyses of Yields from Uniblends and Biblends of Eight Dry Bean Cultivars

Response model equations and corresponding statistical analyses are presented for experiments involving mixtures of pairs of cultivars (biblends), both when the individual yields in a biblend and when only the total yields are available. These were applied to yield data for eight dry bean (Phaseolus vulgaris L.) cultivars. Data were obtained from four experiments conducted in 2 years (1966 and 1967) at two locations (Ithaca and Aurora, New York). Concepts of general mixing and specific mixing effects are discussed and are related to the concepts of general and specific combining ability in diallel crossing experiments. In diallel crossing experiments, only the total of the two components is available, whereas in the bean experiments, individual yields of the two cultivars in a biblend were available. This additional information may be used for further evaluation of the mixtures.

Key Words: Cropping systems • General combining ability • General mixing effect • Response model equations • Intercropping • Specific combining ability • Specific mixing effect • Best linear unbiased estimates • Phaseolus vulgaris L.

² Research geneticist, USDA, SEA, Dep. of Agronomy and Range Science, Univ. of California, Davis, CA.

Received for publication December 4, 1979.