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Effect of Drought Stress on Velvetleaf (Abutilon theophrasti) and Bentazon Efficacy

Published online by Cambridge University Press:  12 June 2017

John R. Hinz  and
Michael D. K. Owen
John R. Hinz
Affiliation:
Agron. Dep., Iowa State Univ., Ames, IA 50011
Michael D. K. Owen
Affiliation:
Agron. Dep., Iowa State Univ., Ames, IA 50011
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Abstract

Greenhouse experiments were conducted to determine the effects of drought stress length and relief on velvetleaf growth and bentazon efficacy with crop oil concentrate (COC) and 28% urea ammonium nitrate (UAN). Drought stress caused leaf water and osmotic potentials to decline linearly over time. Leaf water potential ΨL) declined 0.02 and 0.08 MPa day−1 for velvetleaf subjected to −0.03 and −0.4 MPa soil water potential (ΨP), respectively. Osmotic potential (ΨO) declined 0.02 and 0.21 MPa day−1 for velvetleaf subjected to −0.03 and −0.4 MPa ΨP respectively. Bentazon did not reduce drought-stressed compared to non-drought-stressed velvetleaf dry weight 21 d after treatment with either COC or no adjuvant but did decrease dry weight with UAN. Reduced velvetleaf dry wights in drought-stressed velvetleaf compared to non-drought-stressed velvetleaf could not be accounted for by increased bentazon penetration in the drought-stressed plants. Rewatering velvetleaf subjected to 7 d of −0.4 MPA ΨP caused them to be more sensitive to bentazon than velvetleaf subjected to −0.03 MPa ΨP except when UAN was the adjuvant.

Keywords

Bentazon, 3-(1-methylethyl)-(1H)-2,1,3-benzothiadiazin-4(3H)-one 2,2-dioxidevelvetleaf, Abutilon theophrasti Medic. # ABUTHDrought stress reliefherbicide penetrationosmotic potentialleaf water potentialABUTH
Type
Weed Control and Herbicide Technology
Information
Weed Science , Volume 42 , Issue 1 , March 1994 , pp. 76 - 81
Copyright
Copyright © 1994 by the Weed Science Society of America 

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