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Glyphosate Interactions with Manganese

Published online by Cambridge University Press:  20 January 2017

William A. Bailey ,
Daniel H. Poston ,
Henry P. Wilson  and
Thomas E. Hines
William A. Bailey
Affiliation:
Eastern Shore Agricultural Research and Extension Center, Virginia Tech, Painter, VA 23420
Daniel H. Poston
Affiliation:
Eastern Shore Agricultural Research and Extension Center, Virginia Tech, Painter, VA 23420
Henry P. Wilson*
Affiliation:
Eastern Shore Agricultural Research and Extension Center, Virginia Tech, Painter, VA 23420
Thomas E. Hines
Affiliation:
Eastern Shore Agricultural Research and Extension Center, Virginia Tech, Painter, VA 23420
*
Corresponding author's E-mail: [email protected]
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Abstract

Field experiments were conducted on the Eastern Shore of Virginia from 1999 to 2001 to evaluate the effects of tank mixture applications of isopropylamine or trimethylsulfonium salts of glyphosate with two liquid formulations of manganese (Mn lignin or Mn chelate) on spray solution pH and weed control in glyphosate-resistant soybean. Additions of manganese to herbicide solutions resulted in a reduction in the acidifying effects of the herbicides as well as in the control of common lambsquarters, large crabgrass, morningglory spp., and smooth pigweed. Reduced control caused by manganese could be overcome with higher rates of the herbicides on some species, but reduced control of common lambsquarters was seen when manganese was included with any herbicide application rate. For most species, Mn chelate caused a greater reduction in control than did Mn lignin. Although manganese caused significant decreases in weed control, soybean yield was not influenced by glyphosate salt, application rate, or manganese. Reduced weed control caused by the addition of manganese to herbicide solutions may be due to the complexing of the herbicide formulations, which could result in the formation of insoluble salt complexes that are not readily absorbed through the plant cuticle, resulting in decreased glyphosate phytotoxicity.

Keywords

Glyphosatecommon lambsquarters, Chenopodium album L. #3 CHEALlarge crabgrass, Digitaria sanguinalis L. # DIGSAmorningglory spp., Ipomoea spp. # IPOSSsmooth pigweed, Amaranthus hybridus L. # AMACHsoybean, Glycine max (L.) Merr. ‘Asgrow 5401 RR’pHreduced weed controltank mixtureIpa, isopropylaminePOST, postemergenceTms, trimethylsulfoniumWAP, weeks after plantingWAT, weeks after treatment
Type
Research
Information
Weed Technology , Volume 16 , Issue 4 , December 2002 , pp. 792 - 799
Copyright
Copyright © Weed Science Society of America 

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