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Diurnal Leaf Movement Effects on Spray Interception and Glyphosate Efficacy

Published online by Cambridge University Press:  12 June 2017

Jason K. Norsworthy ,
Lawrence R. Oliver  and
Larry C. Purcell
Jason K. Norsworthy*
Affiliation:
Department of Crop, Soil, and Environmental Sciences, University of Arkansas, Fayetteville, AR 72704
Lawrence R. Oliver
Affiliation:
Department of Crop, Soil, and Environmental Sciences, University of Arkansas, Fayetteville, AR 72704
Larry C. Purcell
Affiliation:
Department of Crop, Soil, and Environmental Sciences, University of Arkansas, Fayetteville, AR 72704
*
Corresponding author's E-mail: jnorswo@comp.uark.edu.
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Abstract

Time of day at which a herbicide is applied can affect efficacy, and variability may be attributed to leaf angles at application. Spray interception by hemp sesbania (Sesbania exaltata), sicklepod (Senna obtusifolia), and prickly sida (Sida spinosa) under day and night conditions was quantified by measuring interception of a 2-M potassium nitrate solution. Following the night application, interception by prickly sida, hemp sesbania, and sicklepod was reduced 17, 67, and 70%, respectively. In a second study in the greenhouse, glyphosate was applied to hemp sesbania, pitted morningglory (Ipomoea lacunosa), prickly sida, and sicklepod at 6:00 and 11:00 A.M. and 4:00 and 9:00 P.M. Control of all species was dependent on the time of day treated, with night applications generally being less effective.

Keywords

Glyphosate, N-(phosphonomethyl)glycinehemp sesbania, Sesbania exaltata (Raf.) Rydb. ex A. W. Hill # SEBEXpitted morningglory, Ipomoea lacunosa L. # IPOLAprickly sida, Sida spinosa L. # SIDSPsicklepod, Senna obtusifolia L. # CASOBBiological rhythmscircadianCASOBIPOLASEBEXSIDSPDAT, days after treatment
Type
Research
Information
Weed Technology , Volume 13 , Issue 3 , September 1999 , pp. 466 - 470
Copyright
Copyright © 1999 by the Weed Science Society of America 

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