Agronomy Journal Journal of Natural Resources and Life Sciences Education
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Published online 1 October 1956
Published in Agron J 48:467-471 (1956)
© 1956 American Society of Agronomy
677 S. Segoe Rd., Madison, WI 53711 USA
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Effects of Annual Weeds on the Growth and Yield of Soybeans1

David W. Staniforth and Charles R. Weber2

Synopsis: In 15 experiments, yield reductions of soybeans in weed-infested plantings averaged 3.7 bushels per acre or approximately 10% of weed-free beans when weeds were grown the entire season. Foxtail reduced bean yields slightly less than smartweed or velvet leaf. Dry matter yield of above ground parts of soybeans and weeds combined approximated that of weed-free beans alone. Effects of rainfall are discussed. Possible effects of uncontrolled factors are recognized.

1 Joint contribution from the Iowa Agr. Exp. Sta., Ames, Iowa, and the Field Crops Research Branch, A.R.S., U.S.D.A. Journal paper No. J-2970, Iowa Agr. Exp. Sta., Ames, Iowa. Project Nos. 1121 and 1179. U.S.R.S.L. Publication No. 279. This study was supported in part by a grant-in-aid from the Hail Insurance Adjustment and Research Association and ten mutual hail insurance companies.

2 Associate Professor of Botany and Plant Pathology and Farm Crops; and Associate Professor of Farm Crops and Agronomist, Field Crops Research Branch, A.R.S., U.S.D.A., respectively.

Received for publication June 14, 1956.




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Copyright © 1956 by the American Society of Agronomy.