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Common Ragweed (Ambrosia artemisiifolia) Interference in Soybeans (Glycine max)

Published online by Cambridge University Press:  12 June 2017

H. D. Coble ,
F. M. Williams  and
R. L. Ritter
H. D. Coble
Affiliation:
Dep. Crop Sci., North Carolina State Univ., Raleigh, NC 27650
F. M. Williams
Affiliation:
Ferrum College, Ferrum, VA 24088
R. L. Ritter
Affiliation:
Dep. Agron., Univ. of Maryland, College Park, MD 20742
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Abstract

The influence of common ragweed (Ambrosia artemisiifolia L.) interference on soybean [Glycine max (L.) Merr. ‘Ransom’] yield was studied in the field utilizing naturally occurring weed populations. The damage-threshold population for a full-season, in-row common ragweed infestation was four weeds/10 m of row, which resulted in an 8% yield loss. Soybeans kept weed-free for 2 weeks or longer after emergence in a dry year produced normal yields, but 4 weeks of weed-free maintenance was required when adequate moisture was available early in the growing season. Soybean yield was not reduced by a natural population of common ragweed if the period of interference was limited to 6 weeks or less after crop emergence. By 8 weeks after emergence, common ragweed height averaged 25 cm taller than soybeans, and the weed canopy intercepted 24% of the photosynthetically active radiation.

Keywords

Competitioneconomic thresholdintegrated pest management

Information

Type
Research Article
Information
Weed Science , Volume 29 , Issue 3 , May 1981 , pp. 339 - 342
Copyright
Copyright © Weed Science Society of America 

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References

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