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Fate of simazine in a drip-irrigated Vitis vinifera vineyard

Published online by Cambridge University Press:  20 January 2017

Fuhan Liu  and
Timothy S. Prather
Timothy S. Prather
Affiliation:
Kearney Agricultural Center, University of California, Parlier, CA 93648
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Abstract

To determine simazine movement and dissipation in a drip-irrigated Vitis vinifera vineyard under two irrigation schedules [ grower standard (GS) and current evaporation/transpiration (CET)], field experiments were conducted in a Hanford fine sandy loam, a soil type prone to leaching. In experiment 1, simazine was surface-applied in a 1.7-m swath down the vine row, and chloride was applied as a tracer. Total recovery of simazine was < 1.0% under the irrigation emitters 51 and 57 d after simazine application in 1997 and 1999, respectively. Simazine was not detected in the soil profile from 0 to 150 cm deep, 1.0 m from the emitters. A chloride tracer moved to a soil depth of 90 cm but not deeper. In experiment 2, simazine moved 75 cm under the emitters in 7 d but did not move deeper into the soil. Under the emitter, 28% of applied simazine was found 0 to 45 cm deep and 3% was > 45 cm deep. In experiment 3, which was conducted in the absence of irrigation, total recovery of simazine was 30% when sheltered from rain and 8% when exposed to rain. Rapid dissipation and proper irrigation management were key factors preventing deep percolation of simazine in these studies.

Keywords

SimazineVitis vinifera L., grapeIrrigation scheduleleachingmicrobial degradation
Type
Research Article
Information
Weed Science , Volume 48 , Issue 4 , August 2000 , pp. 514 - 517
Copyright
Copyright © Weed Science Society of America 

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