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Foliar Nitrogen Loss and CO2 Equilibrium as Influenced by Three Soybean (Glycine max) Postemergence Herbicides

Published online by Cambridge University Press:  12 June 2017

R. T. Weiland ,
C. A. Stutte  and
R. E. Talbert
R. T. Weiland
Affiliation:
Dep. of Agron., Altheimer Lab., Univ. of Arkansas, Fayetteville, AR 72701
C. A. Stutte
Affiliation:
Dep. of Agron., Altheimer Lab., Univ. of Arkansas, Fayetteville, AR 72701
R. E. Talbert
Affiliation:
Dep. of Agron., Altheimer Lab., Univ. of Arkansas, Fayetteville, AR 72701
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Abstract

‘Forrest’ soybean [Glycine max (L.) Merr.] infested with entireleaf morningglory [Ipomoea hederacea (L.) Jacq. var. integriusula Gray] were treated in the field with three postemergence herbicides, dinoseb (2-sec-butyl-4,6-dinitrophenol), sodium salt of acifluorfen {5-[2-chloro-4-(trifluoromethyl)phenoxy]-2-nitrobenzoic acid}, and 2,4-DB [4-(2,4-dichlorophenoxy)butyric acid]. Foliar nitrogen (N) loss, transpiration, and CO2 equilibrium concentrations were measured from 4 to 148 h after treatment. In morningglory foliar N loss was increased by dinoseb, decreased by acifluorfen, and first increased and then decreased by 2,4-DB treatments. Transpiration in this weed species was decreased by all three herbicides. In soybean, N loss was increased and transpiration decreased with dinoseb; acifluorfen did not affect either activity; and 2,4-DB decreased both processes during one sampling period. In both plant species dinoseb increased the CO2 equilibrium concentration within 4 h after treatment. Treatments with acifluorfen and 2,4-DB initially increased the CO2 concentration in morningglory with major increases noted at the onset of chlorosis 52 h after treatment. In soybean, some significant decreases in CO2 equilibrium concentrations occurred with the lowest rate of all three herbicides.

Keywords

Dinosebacifluorfen2,4-DBtranspiration
Type
Research Article
Information
Weed Science , Volume 27 , Issue 5 , September 1979 , pp. 545 - 548
Copyright
Copyright © 1979 by the Weed Science Society of America 

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References

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