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Fluroxypyr Efficacy is Affected by Relative Humidity and Soil Moisture

Published online by Cambridge University Press:  20 January 2017

Mark D. Lubbers ,
Phillip W. Stahlman  and
Kassim Al-Khatib
Mark D. Lubbers
Affiliation:
Department of Agronomy, Kansas State University, Manhattan, KS 66506
Phillip W. Stahlman*
Affiliation:
Agricultural Research Center–Hays, Kansas State University, 1232 240th Avenue, Hays, KS 67601
Kassim Al-Khatib
Affiliation:
Department of Agronomy, Kansas State University, Manhattan, KS 66506
*
Corresponding author's E-mail: stahlman@ksu.edu
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Abstract

An experiment was conducted in controlled environments to evaluate the effects of relative humidity (RH) and soil moisture (SM) on fluroxypyr efficacy on kochia and Palmer amaranth. Plants were grown in growth chambers with constant RH of 35 or 90 ± 5% and 28/23 C day/night temperature. Within each growth chamber, plants were grown in SM regimes of either −20 or −40 kPa. When plants were 8 to 10 cm tall, fluroxypyr was applied at 26, 52, 78, or 104 g ae ha−1; a nontreated control was included. At 21 days after treatment, control of both species increased with increasing fluroxypyr rate. Kochia control was not affected by RH, but control was greater when plants were grown in moist soil (−20 kPa) than in dry soil (−40 kPa). Conversely, Palmer amaranth control was greater when plants were grown at 90% RH than at 35% RH, but control did not differ between moist and dry soils. This study showed that the influence of environmental factors on fluroxypyr efficacy on kochia and Palmer amaranth is species dependent.

Keywords

Fluroxypyrkochia, Kochia scoparia (L.) Schrad. KCHSCPalmer amaranth, Amaranthus palmeri (S.) Wats. AMAPAEnvironmentenvironmental factorsherbicide efficacyplant stress
Type
Weed Management
Information
Weed Science , Volume 55 , Issue 3 , June 2007 , pp. 260 - 263
Copyright
Copyright © Weed Science Society of America 

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Footnotes

Current address: Monsanto Company, 5912 North Meridan Avenue, Wichita, KS 67204.

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