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Relationship of Component Frequency to Compensatory Response in Soybean Blends¹

We evaluated the effect of component frequency on the compensatory response of soybean (Glycine max L. Merrill) blends. The component frequency of a blend of ‘Corsoy’ and ‘Amsoy 71’ was varied by 2.5% increments from 100:0 to 0:100. The 41 entries were evaluated for yield at four environments in Iowa during 1973 to 1975.

There were no significant differences among component frequencies for average yield across environments. All deviations of blend yields from the weighted mean of the two cultivars in pure stand were attributed to random error. The environment x component frequency interaction was significant due to changes in rank of entries across environments. The results demonstrate the difficulty of differentiating between random error and true overcompensation or undercompensation in soybean blends.

Key Words: Glycine max (L.) Merrill • Mixtures • Intergenotypic competition • Heterogeneity • Random error

² Professor and assistant professor, Dep. of Agronomy, Iowa State Univ., Ames, IA 50011.

Received for publication October 15, 1979.