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Substitutes for Ammonium Sulfate as Additives with Glyphosate and Glufosinate

Published online by Cambridge University Press:  20 January 2017

David Pratt ,
James J. Kells  and
Donald Penner
David Pratt
Affiliation:
Department of Crop and Soil Sciences, Michigan State University, East Lansing, MI 48824-1325
James J. Kells
Affiliation:
Department of Crop and Soil Sciences, Michigan State University, East Lansing, MI 48824-1325
Donald Penner*
Affiliation:
Department of Crop and Soil Sciences, Michigan State University, East Lansing, MI 48824-1325
*
Corresponding author's E-mail: [email protected]
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Abstract

Glyphosate and glufosinate are now options for postemergence weed control in herbicide-resistant corn and soybean. Velvetleaf is one of the more difficult to control annual weeds with these herbicides at commonly used rates. Ammonium sulfate (AMS) is generally used with these herbicides to overcome hard water antagonism and to increase herbicide activity. Greenhouse and field trials were conducted with commercial adjuvants that might substitute for AMS. The adjuvants were evaluated in deionized water, tap water, and deionized water containing 500 mg/L CaCO3. In the absence of AMS, hard water reduced velvetleaf control with both herbicides. Regardless of water source, AMS increased velvetleaf control with both glyphosate and glufosinate. Several adjuvants increased velvetleaf control with either herbicide; however, none were superior to 2% w/v AMS. Other adjuvants decreased velvetleaf control with either herbicide.

Keywords

Ammonium sulfateglufosinateglyphosatevelvetleaf, Abutilon theophrasti Medic # ABUTHcorn, Zea mays L. # ZEAMAsoybean, Glycine max (L.) Merr. # GLYMAAmmonium sulfateglufosinateglyphosate
Type
Research
Information
Weed Technology , Volume 17 , Issue 3 , September 2003 , pp. 576 - 581
Copyright
Copyright © Weed Science Society of America 

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References

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