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Performance of Isogenic Soybean Lines in Monoculture and Relay Intercropping Environments¹

Sets of near-isogenic lines of soybeans [Glycine max (L.) Merr.], differing in single characteristics, have been tested in monoculture environments but not in relay intercropping environments. These environments seemed different enough to warrant testing several near isogenic lines differing by the genes dt₁, Dt₂, Lf₁, ln, or e₃ to determine if any of these genes confer a yield advantage in relay intercropping.

Near isogenic lines in ‘Harosoy’ and ‘Clark’ genetic backgrokunds were grown in monoculture and in relay intercropping systems at Urbana, 111. in 1978 and 1979 and at DeKalb, 111. in 1979. In relay intercropping plots, soybeans were planted between rows of small grains 1 to 2 months before small grain harvest. The soybeans germinated and established stands, then the small grains were harvested as they matured.

There was no consistent yield advantage for any of the plant traits when isogenic lines were grown either in relay intercropping or in monoculture systems. The dt₁ allele reduced yield in both cropping systems. The ln and Lf₁ alleles reduced yields in some environments. The Dt₂ and e₃ alleles had consistently neutral effects on yield in both cropping systems.

Key Words: Glycine max (L.) Merr. • Winter wheat • Triticum aestivum L. • Spring oats • Avena sativa L. • Interplanting • Interseeding • Multiple cropping

² Former graduate assistant (present address Northrup King Co., St. Joseph, IL 61873), and professors, Dep. of Agronomy, Univ. of Illinois, Urbana, IL 61801.

Received for publication August 27, 1980.

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