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Effect of Oil Adjuvants and Nitrogen Fertilizer on the Efficacy of Imazethapyr Applied at Conventional and Ultralow Spray Volumes

Published online by Cambridge University Press:  12 June 2017

Gene D. Wills ,
James E. Hanks ,
Elizabeth J. Jones  and
Robert E. Mack
Gene D. Wills
Affiliation:
Delta Research and Extension Center, Mississippi Agriculture and Forestry Experiment Station, Stoneville, MS 38776, E-mail: gwills@drec.msstate.edu
James E. Hanks
Affiliation:
Application Production Technology Research Unit, Agricultural Research Service, U.S. Department of Agriculture, Stoneville, MS 38776
Elizabeth J. Jones
Affiliation:
Delta Research and Extension Center, Mississippi Agriculture and Forestry Experiment Station, Stoneville, MS 38776
Robert E. Mack
Affiliation:
Research and Development, Helena Chemical Co., Memphis, TN 38120
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Abstract

Field experiments evaluated pitted morningglory, velvetleaf, and barnyardgrass control in soybean with imazethapyr applied alone and with either crop oil concentrate at 1.0% v/v, a blend of methylated seed oil and organosilicone surfactant, or a blend of methylated seed oil, phosphate esters, and organosilicone surfactant at 0.5% v/v, each with and without a 28% N mixture of urea and ammonium nitrate (URAN) applied at 2.3 L/ha. Treatments were applied at spray volumes of 94 and 9.4 L/ha. Control of each species was often increased with the addition of both oil adjuvants and URAN. The blend of methylated seed oil, phosphate esters, and organosilicone surfactant and the blend of methylated seed oil and organosilicone surfactant were each more effective than crop oil concentrate on pitted morningglory and barnyardgrass, while each oil adjuvant was similar on velvetleaf. The URAN effectively increased imazethapyr control of all species. Control of all species was similar at the spray volume of 9.4 L/ha and at 94 L/ha.

Keywords

Imazethapyr, 2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-5-ethyl-3-pyridinecarboxylic acidpitted morningglory, Ipomoea lacunosa L. # IPOLAvelvetleaf, Abutilon theophrasti Medik. # ABUTHbarnyardgrass, Echinochloa crus-galli (L.) Beauv. # ECHCGsoybean, Glycine max (L.) Merr.Crop oil concentratemethylated seed oilphosphate estersorganosilicone surfactantsilicone surfactantURANAbutilon theophrastiEchinochloa crus-galliIpomoea lacunosaGlycine maxABUTHECHCGIPOLANS, not significantPOST, postemergencePRE, preemergenceURAN, mixture of urea and ammonium nitrate
Type
Research
Information
Weed Technology , Volume 12 , Issue 3 , September 1998 , pp. 441 - 445
Copyright
Copyright © 1998 by the Weed Science Society of America 

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