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Johnsongrass (Sorghum halepense) Control and Soil Moisture Relationships in No-Tillage, Doublecropped Soybeans (Glycine max)

Published online by Cambridge University Press:  12 June 2017

Michael S. Defelice ,
William W. Witt  and
James R. Martin
Michael S. Defelice
Affiliation:
Dep. Agron., Univ. Kentucky, Lexington, KY 40546
William W. Witt
Affiliation:
Dep. Agron., Univ. Kentucky, Lexington, KY 40546
James R. Martin
Affiliation:
Dep. Agron., Univ. Kentucky, Lexington, KY 40546
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Abstract

Field experiments were conducted in Princeton, KY, in 1982, 1983, and 1984 to evaluate johnsongrass [Sorghum halepense (L.) Pers. # SORHA] control programs in no-tillage, doublecropped soybeans [Glycine max (L.) Merr. ‘Essex′]. Sequential applications of sethoxydim {2-[1-(ethoxyimino)butyl]-5-[2-(ethylthio)propyl]-3-hydroxy-2-cyclohexen-1-one} or fluazifop {(±)-2-[4-[[5-(trifluoromethyl)-2-pyridinyl] oxy] phenoxy] propanoic acid} at 0.2 kg ai/ha provided 36 to 94% johnsongrass control. The lower control values from these treatments were obtained in the droughty 1983 growing season while the higher and acceptable control ratings were obtained in 1982 and 1984 when rainfall was more plentiful. Preplant applications that contained glyphosate [N-(phosphonomethyl)glycine] provided johnsongrass control greater than those containing paraquat (1,1′-dimethyl-4,4′-bypyridinium ion). Soybean yields and soil moisture were greater with preplant applications of glyphosate than with preplant applications of paraquat or foliar applications of sethoxydim, fluazifop, or glyphosate. Greatest yields were obtained with a combination of a preplant application of glyphosate and a postemergence application of sethoxydim.

Keywords

AlachlorfluazifopglyphosateoryzalinparaquatsethoxydimGLXMASORHA
Type
Weed Control and Herbicide Technology
Information
Weed Science , Volume 35 , Issue 1 , January 1987 , pp. 108 - 114
Copyright
Copyright © 1987 by the Weed Science Society of America 

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References

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