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Glufosinate Efficacy on Amaranthus Species in Glufosinate-Resistant Soybean (Glycine max)

Published online by Cambridge University Press:  20 January 2017

Elmé Coetzer ,
Kassim Al-Khatib  and
Dallas E. Peterson
Elmé Coetzer
Affiliation:
Department of Agronomy, Kansas State University, Manhattan, KS 66506
Kassim Al-Khatib*
Affiliation:
Department of Agronomy, Kansas State University, Manhattan, KS 66506
Dallas E. Peterson
Affiliation:
Department of Agronomy, Kansas State University, Manhattan, KS 66506
*
Corresponding author's E-mail: [email protected].
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Abstract

Field studies were conducted in 1998 and 1999 to evaluate the efficacy of glufosinate on Palmer amaranth, redroot pigweed, and common waterhemp at different growth stages in soybean planted at early, normal, and late dates. At 2, 4, and 8 wk after treatment, common waterhemp control was greater than Palmer amaranth and redroot pigweed control with single glufosinate applications of 410 g ai/ha at 2- to 5-, 7- to 10-, or 15- to 18-cm Amaranthus height or with two sequential applications of 293 g/ha at 2- to 5-cm height and 2 wk later. Only the sequential applications of 410 and 293 g/ha resulted in more than 80% control of Palmer amaranth and redroot pigweed, but all five treatments controlled common waterhemp more than 80%. All glufosinate treatments reduced the dry weight of all Amaranthus species by more than 65%. However, the sequential applications resulted in the greatest dry weight reductions.

Keywords

Glufosinatecommon waterhemp, Amaranthus rudis Sauer #3 AMATAPalmer amaranth, Amaranthus palmeri S.Wats. # AMAPAredroot pigweed, Amaranthus retroflexus L. # AMAREsoybean, Glycine max (L.) MerrEnvironmental conditionsherbicide-tolerant soybeanpostemergence herbicideALS, Acetolactate synthase (EC 4.1.3.18)OM, organic matterRH, relative humidityWAT, weeks after treatment
Type
Research
Information
Weed Technology , Volume 16 , Issue 2 , June 2002 , pp. 326 - 331
Copyright
Copyright © Weed Science Society of America 

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