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The Effects of Soybean (Glycine max) Interference on the Canopy Architecture of Common Cocklebur (Xanthium strumarium), Jimsonweed (Datura stramonium), and Velvetleaf (Abutilon theophrasti)

Published online by Cambridge University Press:  12 June 2017

Emilie E. Regnier  and
Edward W. Stoller
Emilie E. Regnier
Affiliation:
Dep. Agron., Univ. Illinois, and Plant Physiol., U.S. Dep. Agric., Agric. Res. Serv. and Dep. Agron., Univ. Illinois, Urbana, IL 61801
Edward W. Stoller
Affiliation:
Dep. Agron., Univ. Illinois, and Plant Physiol., U.S. Dep. Agric., Agric. Res. Serv. and Dep. Agron., Univ. Illinois, Urbana, IL 61801
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Abstract

Common cocklebur, jimsonweed, and velvetleaf were grown with soybeans in the field to determine how soybean interference affects weed canopy architecture. Common cocklebur had more leaves within the soybean canopy than jimsonweed or velvetleaf. At the end of the season, common cocklebur leaf area was distributed evenly below and above the top of the soybean canopy, while nearly all the jimsonweed and velvetleaf leaf area was above the soybean canopy. Common cocklebur exhibited more shade tolerance than jimsonweed or velvetleaf by also maintaining leaves in the shade within the soybean canopy. Differences among these weeds in leaf distribution within the soybean canopy were not related to differences in abscission of the lower leaves but to a differential response of lower axillary buds to soybean shading. Growth from lower axillary buds in jimsonweed and velvetleaf was strongly inhibited by soybean interference, but interference had little effect on lower axillary bud growth in common cocklebur. Axillary bud growth in the lower canopies of both common cocklebur and soybeans, and their similarity in height, caused these plants to compete for the same aboveground niche. However, common cocklebur had more extensive axillary growth along the lower stem than soybeans, which may allow it to compete for resources in this niche more aggressively than soybeans. Velvetleaf and jimsonweed did not share the same aboveground niche with soybeans due to the placement of their leaves above rather than within the soybean canopy. The lower branching characteristics and apparent shade tolerance of common cocklebur may be important factors in the superior competitive ability with soybeans compared to jimsonweed and velvetleaf.

Keywords

Common cocklebur, Xanthium strumarium L. ♯3 XANSTjimsonweed, Datura stramonium L. ♯ DATSTsoybean, Glycine max L. Merrvelvetleaf, Abutilon theophrasti Medic. ♯ ABUTHBranchingleaf abscissionleaf arealeaf distributionlight profileshade toleranceXANSTDATSTABUTH
Type
Weed Biology and Ecology
Information
Weed Science , Volume 37 , Issue 2 , March 1989 , pp. 187 - 195
Copyright
Copyright © 1989 by the Weed Science Society of America 

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