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Published in Crop Sci 21:673-676 (1981)
© 1981 Crop Science Society of America
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Evaluation of Soybean Cultivars in Monoculture and Relay Intercropping Systems1

R. L. McBroom, H. H. Hadley, C. M. Brown and R. R. Johnson2

Cultivars of soybean [Glycine max (L.) Merrill] were grown in monoculture and in relay intercropping systems at Urbana, Ill. in 1978 and 1979 and at DeKalb, Ill. in 1979 to determine if there is a genotype x cropping system interaction that would require separate breeding programs for maximum progress in developing new cultivars for use in different systems.

Relay intercropped soybeans were shorter, lodged less, and produced lower yields than soybeans grown in monoculture. No significant genotype x cropping system interaction for yield was detected when soybeans were interplanted in small grains [winter wheat (Triticum aestivum L.) or spring oats (Avena sativa L.)] and planted in monoculture on the same day. Early season competition in intercropping was not sufficient in these experiments to cause differential performance among genotypes. Our results suggest that separate breeding programs are not required to develop cultivars for monoculture or intercropping.

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

1 Contribution from the Dep. of Agronomy, Univ. of Illinois, Urbana IL 61801.

2 Former graduate assistant, professors, and former associate professor (present address: John Deere and Co., Moline, IL 61625) Dep. of Agronomy, Univ. of Illinois, Urbana, IL 61801.

Received for publication August 27, 1980.




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