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Addition of Nonionic Surfactant to Glyphosate Plus Chlorimuron

Published online by Cambridge University Press:  20 January 2017

Jason K. Norsworthy  and
Timothy L. Grey
Jason K. Norsworthy*
Affiliation:
Department of Crop and Soil Environmental Sciences, Clemson University, 277 Poole Agricultural Center, Clemson, SC 29634-0359
Timothy L. Grey
Affiliation:
Crop and Soil Science Department, University of Georgia, P.O. Box 748, Tifton, GA 31793
*
Corresponding author's E-mail: jnorswo@clemson.edu
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Abstract

Field studies were conducted in South Carolina and Georgia to evaluate weed control and soybean tolerance and yield after nonionic surfactant addition to combinations of chlorimuron plus an adjuvant-containing glyphosate formulation. Treatments included glyphosate alone, at 420 or 840 g ae/ha, or in combination with 6 or 9 g ai/ha chlorimuron and all possible combinations with or without 0.25% (v/v) nonionic surfactant. Other treatments included a weed-free and nontreated check. Chlorimuron plus glyphosate improved entireleaf, smallflower, and tall morningglory control over glyphosate alone, but nonionic surfactant addition did not further improve the control of any species, except tall morningglory. Up to 31% early-season injury was observed with the three-way mixture. Soybean injury was greater, and yields were reduced in one of three trials when nonionic surfactant was added to chlorimuron plus glyphosate combinations. This research indicates that there would be no benefit from the nonionic surfactant addition to this adjuvant-containing glyphosate formulation when combined with chlorimuron.

Keywords

Chlorimuronglyphosateentireleaf morningglory, Ipomoea hederacea var. integriuscula Gray # IPOHGsmallflower morningglory, Jacquemontia tamnifolia (L.) Griseb. # IAQTAtall morningglory, Ipomoea purpurea (L.) Roth # PHBPUsoybean, Glycine max (L.) MerrAdjuvantcrop injuryglyphosate-resistant soybeanherbicide mixturesALS, acetolactate synthase
Type
Research
Information
Weed Technology , Volume 18 , Issue 3 , September 2004 , pp. 588 - 593
Copyright
Copyright © Weed Science Society of America 

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Footnotes

∗ Technical contribution 4855 from the South Carolina Agriculture and Forestry Research System.

References

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