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Spatial variation in herbicide leaching from a marine clay soil via subsurface drains

Ulen, Barbro and Larsbo, Mats and Kreuger, Jenny and Svanbäck, Annika (2014). Spatial variation in herbicide leaching from a marine clay soil via subsurface drains. Pest management science. 70:3, 405-414
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Official URL: http://dx.doi.org/10.1002/ps.3574

Abstract

BACKGROUND: Subsurface transport via tile drains can significantly contribute to pesticide contamination of surface waters. The spatial variation in subsurface leaching of normally applied herbicides was examined together with phosphorus losses in 24 experimental plots with water sampled flow-proportionally. The study site was a flat, tile-drained area with 60% marine clay in the topsoil in southeast Sweden. The objectives were to quantify the leaching of frequently used herbicides from a tile drained cracking clay soil and to evaluate the variation in leaching within the experimental area and relate this to topsoil management practices (tillagemethod and structure liming). RESULTS: In summer 2009, 0.14, 0.22 and 1.62%, respectively, of simultaneously applied amounts of MCPA, fluroxypyr and clopyralid were leached by heavy rain five days after spraying. In summer 2011, on average 0.70% of applied bentazone was leached by short bursts of intensive rain 12 days after application. Peak flow concentrations for 50% of the treated area for MCPA and 33% for bentazone exceeded the Swedish no-effect guideline values for aquatic ecosystems. Approximately 0.08% of the glyphosate applied was leached in dissolved form in the winters of 2008/2009 and 2010/2011. Based on measurements of glyphosate in particulate form, total glyphosate losseswere twice as high (0.16%) in the second winter. The spatial inter-plot variation was large (72–115%) for all five herbicides studied, despite small variations (25%) in water discharge. CONCLUSIONS: The study shows the importance of local scale soil transport properties for herbicide leaching in cracking clay soils.

Authors/Creators:Ulen, Barbro and Larsbo, Mats and Kreuger, Jenny and Svanbäck, Annika
Title:Spatial variation in herbicide leaching from a marine clay soil via subsurface drains
Series/Journal:Pest management science (1526-4998)
Year of publishing :2014
Volume:70
Number:3
Page range:405-414
Number of Pages:10
Publisher:Wiley
ISSN:1526-4998
Language:English
Additional Information:This is an open access article under the terms of the Creative Commons Attribution Non-Commercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.
Publication Type:Journal article
Refereed:Yes
Article category:Scientific peer reviewed
Version:Published version
Full Text Status:Public
Agris subject categories.:P Natural resources > P30 Soil science and management
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Agricultural Science
Agrovoc terms:bentazone, clorypalid, glyphosate, fluroxypyr, MCPA, subsoil
Keywords:bentazone, clopyralid, glyphosate, fluroxypyr, MCPA, subsoil
URN:NBN:urn:nbn:se:slu:epsilon-e-2123
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-e-2123
Additional ID:
Type of IDID
Web of Science (WoS)000331220100008
DOI10.1002/ps.3574
ID Code:11509
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Aquatic Sciences and Assessment
(NL, NJ) > Dept. of Soil and Environment
(S) > Dept. of Soil and Environment
Deposited By: SLUpub Connector
Deposited On:13 Jan 2015 08:44
Metadata Last Modified:04 Mar 2015 09:57

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