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Competition of Common Cocklebur (Xanthium pensylvanicum) with Soybean (Glycine max)

Published online by Cambridge University Press:  12 June 2017

James R. Bloomberg ,
Bruce L. Kirkpatrick  and
Loyd M. Wax
James R. Bloomberg
Affiliation:
Dep. Agron., Univ. of Illinois
Bruce L. Kirkpatrick
Affiliation:
Dep. Agron., Univ. of Illinois
Loyd M. Wax
Affiliation:
Agric. Res. Serv., U.S. Dep. Agric., Urbana, IL 61801
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Abstract

The effects of common cocklebur (Xanthium pensylvanicum Wallr.) on soybean [Glycine max (L.) Merr. ‘Wells′] development and seed yield were investigated at Urbana, Illinois, from 1974 through 1977. Increased densities of common cocklebur reduced soybean seed yield, total dry weight, and number of pods per plant. Under full-season competition, one common cocklebur/3 m of row reduced soybean seed yield by 3 to 12%. Soybean seed yield, total dry weight, and number of pods per plant increased as the length of time from soybean emergence to common cocklebur emergence increased. Common cocklebur emerging 4 weeks after soybean emergence reduced soybean seed yield by 7%. As duration of competition with common cocklebur increased, soybean seed yield, total dry weight, and number of pods per plant decreased. The reduction in soybean seed yield was less than 10% when common cocklebur was removed 6 weeks after soybean emergence. Effects of common cocklebur competition with soybeans in Illinois were similar to those observed in the southern United States.

Keywords

Emergenceremovalyield reductionweeds
Type
Research Article
Information
Weed Science , Volume 30 , Issue 5 , September 1982 , pp. 507 - 513
Copyright
Copyright © 1982 by the Weed Science Society of America 

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References

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