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Influence of Ammonium Sulfate, Imazapyr, Temperature, and Relative Humidity on the Absorption and Translocation of Imazethapyr

Published online by Cambridge University Press:  12 June 2017

Lisa M. Kent ,
Gene D. Wills  and
David R. Shaw
Lisa M. Kent
Affiliation:
Delta Branch Exp. Stn., Stoneville, MS 38776
Gene D. Wills
Affiliation:
Delta Branch Exp. Stn., Stoneville, MS 38776
David R. Shaw
Affiliation:
Dep. Plant Pathol. Weed Sci., Mississippi State Univ., Mississippi State, MS 39762
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Abstract

The effects of 1.24 kg ha−1 ammonium sulfate, 5 g ae ha−1 of the isopropylamine salt of imazapyr, and air temperatures of 18, 27, or 35 C at 40 or 100% relative humidity (RH) on the absorption and translocation of the ammonium salt of 14C-imazethapyr applied postemergence to pitted morningglory were evaluated. Absorption of 14C-imazethapyr was greater at 100 than at 40% RH (88 vs. 47%). At 40% RH, absorption was increased to 79% by the addition of ammonium sulfate. At 100% RH absorption was similar with all treatments. Translocation of 14C-imazethapyr applied alone was greater at 100 than at 40% RH (34 vs. 17%). Addition of ammonium sulfate increased translocation at 40% RH but not at 100%. Addition of imazapyr did not affect 14C translocation. Distribution of 14C throughout the plant was more acropetal than basipetal with the greatest distribution at 35 C.

Keywords

Imazapyr (±)-2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-3-pyridinecarboxylic acidimazethapyr, (±)-2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-5-ethyl-3-pyridinecarboxylic acidpitted morningglory, Ipomoea lacunosa L. ♯ IPOLAImidazolinonesinorganic saltsIPOLAair temperaturerelative humidity
Type
Weed Control and Herbicide Technology
Information
Weed Science , Volume 39 , Issue 3 , September 1991 , pp. 412 - 416
Copyright
Copyright © 1991 by the Weed Science Society of America 

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