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AMADS Increases the Efficacy of Glyphosate Formulations on Corn

Published online by Cambridge University Press:  20 January 2017

Dale L. Shaner ,
Phil Westra  and
Scott Nissen
Dale L. Shaner*
Affiliation:
USDA-ARS Water Management Research, Fort Collins, CO 80526
Phil Westra
Affiliation:
Bioagricultural Sciences and Pest Management Department, Colorado State University, Fort Collins, CO 80526
Scott Nissen
Affiliation:
Bioagricultural Sciences and Pest Management Department, Colorado State University, Fort Collins, CO 80526
*
Corresponding author's E-mail: [email protected]
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Abstract

Greenhouse studies were conducted to determine the effect of 1-aminomethanamide dihydrogen tetraoxosulfate (AMADS) as a spray adjuvant on the efficacy of three different glyphosate formulations, the isopropylamine salt (glyphosate-IPA), potassium salt (glyphosate-K), and the acid of glyphosate dissolved in AMADS (glyphosate-A). All formulations were tested at multiple rates with and without AMADS (2% v/v) on greenhouse-grown corn, and growth inhibition was determined by measuring the elongation of the newest emerging leaf between 1 and 7 d after treatment. AMADS increased the efficacy of all three glyphosate formulations by threefold to fourfold. The IC50 values for glyphosate-IPA, glyphosate-K, and glyphosate-A without AMADS on corn were 77, 54, and 53 g ae/ha, respectively; and with AMADS the values were 20, 18, and 21 g/ha, respectively. AMADS was more effective than ammonium sulfate (2% w/v) in overcoming the antagonism of hard water (200 parts per million Ca+2) on glyphosate-K efficacy on corn. The rainfastness of glyphosate-IPA, glyphosate-A, and glyphosate-K was improved with AMADS.

Keywords

Glyphosatecorn, Zea mays L. ‘Triumph 1416’Ammonium sulfaterainfastnesssurfactantAMS, ammonium sulfateDAT, days after treatmentglyphosate-TMS, formulated trimethylsulfonium salt of glyphosateHAT, hours after treatmentIC50, concentration that inhibits growth by 50%NIS, nonionic surfactant
Type
Research Article
Information
Weed Technology , Volume 20 , Issue 1 , March 2006 , pp. 179 - 183
Copyright
Copyright © Weed Science Society of America 

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