Groundwater Residues of Altrazine and Alachlor Under Water-table Management Properties Kalita, Prasanta Kanwar, Rameshwar Kanwar, Rameshwar Baker, James Melvin, Stewart
dc.contributor.department Agricultural and Biosystems Engineering 2018-02-14T08:41:51.000 2020-06-29T22:40:26Z 2020-06-29T22:40:26Z Wed Jan 01 00:00:00 UTC 1997 2014-07-20 1997
dc.description.abstract <p>This study was conducted to investigate the effects of various water-table management (WTM) practices on the concentrations of two surface-applied herbicides, atrazine and alachlor, in a shallow groundwater system. Groundwater samples were collected by installing piezometers and suction tubes at Iowa State University’s research centers near Ames and Ankeny during three corn-growing seasons, 1989-1991. At the Ames site, experiments were conducted by maintaining constant water-table depths (WTD) of 0.3, 0.6, and 0.9 m in nine field-type lysimeters, and groundwater samples were collected from various depths during the corn-growing seasons. At the Ankeny site, a dualpipe subirrigation system was installed on a 0.85 ha field, and variable water-table depths were maintained. Analysis of water samples collected in 1989, 1990, and 1991 clearly indicates that atrazine and alachlor concentrations in groundwater could be substantially reduced by maintaining shallow WTD during the growing season. It was also observed that atrazine concentrations were higher than those of alachlor. Alachlor was not detected in many samples; however, atrazine was detected in all samples, with high concentrations at the Ames site at the 0.9 m WTD, and at the Ankeny site at deeper WTD. Pesticide concentrations in groundwater decreased with soil depth and time. Results of this study suggest a positive influence of WTM practices in reducing pesticide concentrations in groundwater.</p>
dc.description.comments <p>This article is from <em>Transactions of the ASAE</em> 40 (1997): 605–614, doi:<a href="" target="_blank">10.13031/2013.21319</a>. Posted with permission.</p>
dc.format.mimetype application/pdf
dc.identifier archive/
dc.identifier.articleid 1793
dc.identifier.contextkey 5811591
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath abe_eng_pubs/510
dc.language.iso en
dc.source.bitstream archive/|||Sat Jan 15 00:43:57 UTC 2022
dc.source.uri 10.13031/2013.21319
dc.subject.disciplines Agriculture
dc.subject.disciplines Bioresource and Agricultural Engineering
dc.subject.disciplines Water Resource Management
dc.subject.keywords Groundwater quality
dc.subject.keywords Water table management
dc.subject.keywords Atrazine
dc.subject.keywords Alachlor
dc.title Groundwater Residues of Altrazine and Alachlor Under Water-table Management Properties
dc.type article
dc.type.genre article
dspace.entity.type Publication
relation.isAuthorOfPublication 5210e67e-b8da-4e17-be3f-843a09381196
relation.isOrgUnitOfPublication 8eb24241-0d92-4baf-ae75-08f716d30801
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