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Growth Analysis of Soybeans (Glycine max) in Competition with Velvetleaf (Abutilon theophrasti)

Published online by Cambridge University Press:  12 June 2017

E. S. Hagood Jr. ,
T. T. Bauman ,
J. L. Williams Jr.  and
M. M. Schreiber
E. S. Hagood Jr.
Affiliation:
Dep. Bot. and Plant Pathol., Purdue Univ., West Lafayette, IN 47907
T. T. Bauman
Affiliation:
Dep. Bot. and Plant Pathol., Purdue Univ., West Lafayette, IN 47907
J. L. Williams Jr.
Affiliation:
Agric. Res. Sci. Ed. Admin., U.S. Dep. Agric.
M. M. Schreiber
Affiliation:
Dep. Bot. and Plant Pathol., Purdue Univ., West Lafayette, IN 47907
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Abstract

Field experiments were conducted to study the effects of varying velvetleaf (Abutilon theophrasti Medic.) densities and planting dates on the growth and yield of soybeans [Glycine max (L.) Merr. ‘Amsoy 71’]. Velvetleaf densities ranging from 2.5 to 40 plants/m2 caused reductions in the dry weight of soybean leaves, stems, roots, and pods and seeds, and in the leaf area index, pod number, and seed yield when velvetleaf and soybean plants emerged at the same time. The magnitude of reduction in soybean growth and the time at which the reduction was first observed was dependent on weed density. Soybean growth reductions caused by high velvetleaf densities were less when conditions of high soil moisture content minimized the effects of competition for water. Velvetleaf emerging 21 and 23 days after soybean emergence did not reduce crop growth or yield.

Keywords

Weed densityweed emergence date
Type
Research Article
Information
Weed Science , Volume 28 , Issue 6 , November 1980 , pp. 729 - 734
Copyright
Copyright © Weed Science Society of America 

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References

Literature Cited

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