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Economic Comparison of Herbicides for Johnsongrass (Sorghum halepense) Control in Glyphosate-Tolerant Soybean (Glycine max)

Published online by Cambridge University Press:  12 June 2017

Tammy L. Mckinley ,
Roland K. Roberts ,
Robert M. Hayes  and
Burton C. English
Tammy L. Mckinley
Affiliation:
Agricultural Economics and Rural Sociology, The University of Tennessee, Knoxville, TN 37901-1071
Roland K. Roberts
Affiliation:
Agricultural Economics and Rural Sociology, The University of Tennessee, Knoxville, TN 37901-1071
Robert M. Hayes
Affiliation:
Plant and Soil Science, The University of Tennessee, Knoxville, TN 37901-1071
Burton C. English
Affiliation:
Agricultural Economics and Rural Sociology, The University of Tennessee, Knoxville, TN 37901-1071
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Abstract

Returns to land, management, and risk were compared where glyphosate and four graminicides (quizalofop-P, fluazifop-P, sethoxydim, and clethodim) were used for johnsongrass control in glyphosate-tolerant soybean. In 1994 and 1995, returns to land, management, and risk for glyphosate-tolerant soybean were highest using glyphosate and lowest using sethoxydim. Break-even analysis showed that yields needed for equivalent returns with any nontransgenic soybean cultivar treated with any of the graminicides could range from 67 kg/ha less to 202 kg/ha more than the yields achieved with glyphosate. Based on this methodology, farmers would increase their return to land, management, and risk by planting glyphosate-tolerant soybean if expected yield from a standard cultivar treated with a standard herbicide program were less than the break-even yield.

Keywords

Clethodim, (E,E)-(±)-2-[1-[[(3-chloro-2-propenyl)oxy]imino]propyl]-5-[2-(ethylthio)propyl]-3-hydroxy-2-cyclohexen-1-onefluazifop-P, (R)-2-[4-[[5-(trifluoromethyl)-2-pyridinyl]oxy]phenoxy]propanoic acidglyphosate, N-(phosphonomethyl)glycinequizalofop-P, (±)-2-[4-[(6-chloro-2-quinoxalinyl)oxy]phenoxy]propanoic acidsethoxydim, 2-[1-(ethoxyimino)butyl]-5-[2-(ethylthio)propyl]-3-hydroxy-2-cyclohexen-1-onejohnsongrass, Sorghum halepense (L.) Pers. # SORHAsoybean, Glycine max (L.) Merr.Break-even analysisclethodimcostfluazifop-Pglyphosatequizalofop-PsethoxydimSORHABEY, break-even yield
Type
Research
Information
Weed Technology , Volume 13 , Issue 1 , March 1999 , pp. 30 - 36
Copyright
Copyright © 1999 by the Weed Science Society of America 

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References

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