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Published in Crop Sci 10:605-606 (1970)
© 1970 Crop Science Society of America
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Effects of Border Row Competition on Strain Performance and Genetic Variance in Soybeans1

J. C. Thorne and W. R. Fehr2

We evaluated the performance of six soybean (Glycine max (L.) Merr.) strains in three border row competition regimes. Strains x competition regime interaction was significant for yield, but the component of variance was small compared to the component for among strains. Estimates of genetic variance for yield and canopy width were inflated when intergenotypic competition was present. Smaller estimates of genetic variance were observed in intergenotypic competition regimes than in pure stand for maturity and lodging. Competition response for yield was related to maturity, but other factors also were involved.

Key Words: Intergenotypic competition • Common borders • Genetic variance • Glycine max (L.) Merrill

1 Joint contribution from the Crops Research Division, ARSUSDA as No. 611 of the U.S. Regional Soybean Laboratory, and the Iowa Agricultural and Home Economics Exp. Sta., Ames, Iowa, 50010, as Journal Paper No. J-6458, Project No. 1179. Part of a thesis submitted by the senior author in partial fulfillment of the requirements for a Ph.D. degree.

2 Research Associate, Department of Agronomy, Iowa State University (Present address: Northrup, King and Company, Washington, Iowa); and Assistant Professor of Agronomy, and Collaborator, Crops Research Division, ARS-USDA, Iowa State University.

Received for publication May 22, 1970.




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