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Influence of Intergenotypic Competition on Seed Yield of Heterogeneous Soybean Lines¹

Two experiments were conducted to determine if overcompensation or undercompensation due to intergenotypic competition is preferentially associated with high or low-yielding heterogeneous soybean (Glycine max (L.) Merrill) lines. In Experiment 1, yield of 40 random F₂-derived lines, four F₅-derived lines from each F₂ line, and a blend of the four F₅ lines (F₅ blend) were evaluated for two crosses. Linear regression was used to compare the yield of the F₂ lines and F₅ blends with the mean yield of the four F₅ lines. In Experiment 2, four F₅-derived lines were selected from each of six high and six low-yielding F₂-derived lines in the two crosses. The four F₅ lines were evaluated for yield in pure stands, in the six possible two-component blends, and in a four-component blend. Yields of the blends were compared with average performance of the components in pure stands.

In both experiments, overcompensation or undercompensation was not preferentially associated with high or low-yielding heterogeneous lines. The results indicated that early generation testing for yield in soybeans should not be biased significantly by intergenotypic competition within heterogeneous lines.

Key Words: Cultivar development • Recurrent selection • Population improvement • Overcompensation • Undercompensation • Early generation testing

² Former research associate (present address: U and I Incorporated, Research Center, Post Box AE, Moses Lake, WA 98837), professor of agronomy, and professor of statistics, Iowa State Univ., Ames, IA 50011.

Received for publication November 2, 1977.