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Giant Ragweed (Ambrosia trifida) Canopy Architecture and Interference Studies in Soybean (Glycine max)

Published online by Cambridge University Press:  12 June 2017

Theodore M. Webster,
Mark M. Loux,
Emilie E. Regnier and
S. Kent Harrison
Theodore M. Webster
Affiliation:
Ohio State Univ., Columbus, OH 43210
Mark M. Loux
Affiliation:
Ohio State Univ., Columbus, OH 43210
Emilie E. Regnier
Affiliation:
Ohio State Univ., Columbus, OH 43210
S. Kent Harrison
Affiliation:
Ohio State Univ., Columbus, OH 43210
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Abstract

Field experiments were established at Columbus and near South Charleston, OH to determine the effects of giant ragweed population density on soybean yield and to characterize the development of giant ragweed grown in 76-cm soybean rows. An economic threshold was calculated for Ohio using a common treatment for giant ragweed control in soybean. A cost of $41/ha was estimated for a farmer to apply 0.56 kg/ha bentazon plus 0.28 kg/ha fomesafen plus COC (1.25% v/v). Assuming a soybean value of $0.22/kg, the cost of control was equivalent to 5.4 and 7.1% of the soybean yield in 1991 and 1992, respectively, which corresponded to the yield loss caused by 0.08 and 0.03 giant ragweed plants/m2. The competitiveness of giant ragweed can be at least partly attributed to its ability to initiate and maintain axillary leaves and branches within the shaded confines of the soybean canopy.

Keywords

Bentazon, 3-(1-methylethyl)-(1H)-2,1,3-benzothiadiazin-4(3H)-one 2,2-dioxidefomesafen, 5-[2-chloro-4-(trifluoromethyl)phenoxy-N-(methylsulfonyl)-2-nitrobenzamidegiant ragweed, Ambrosia trifida L. # AMBTRsoybean, Glycine max (L.) Merr. ‘Pella 88,’ ‘Resnik,’ ‘Countrymark 343.’Branchingcompetitioncompetitive threshold densityleaf abscissionleaf areanodes

Information

Type
Research
Information
Weed Technology , Volume 8 , Issue 3 , September 1994, pp. 559 - 564
Copyright
Copyright © 1994 by the Weed Science Society of America 

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References

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