Dissipation and Distribution of Herbicides in the Soil Profile

dc.contributor.author Weed, Dee Anna
dc.contributor.author Kanwar, Rameshwar
dc.contributor.author Kanwar, Rameshwar
dc.contributor.author Stoltenberg, D.
dc.contributor.author Pfeiffer, Richard
dc.contributor.department Agricultural and Biosystems Engineering
dc.date 2018-02-17T06:09:51.000
dc.date.accessioned 2020-06-29T22:42:00Z
dc.date.available 2020-06-29T22:42:00Z
dc.date.issued 1995
dc.description.abstract <p>The distribution and dissipation of alachlor [2-chloro-2′,6′-diethyl-<em>N</em>-(methoxymethyl) acetanilide], atrazine (2-chloro-4-ethylamino-6-isopropylamino-1,3,5 triazine), and metribuzin [4-amino-6-(1,1-dimethylethyl)-3-(methylthio)-1,2,4-triazin-5(4<em>H</em>)-one] in soil were studied in 1990, 1991, and 1992. Crop management practices included four tillage methods—chisel plow, moldboard plow, no-till, and ridge-till—and two crop rotations—continuous corn (<em>Zea mays</em> L.) and a corn-soybean [<em>Glycine max</em> (L.) Merr.] rotation. All herbicides were broadcast-spray applied with no incorporation. No-till plots had the smallest amounts of alachlor and metribuzin, whereas ridge-till plots had the smallest amounts of atrazine. Moldboard-plow plots usually contained the highest amounts of all three herbicides, although ridge-till plots had the highest metribuzin levels in 1992. These differences were seldom significant at the 0.05 level of probability, however. Throughout the growing season, 50 to 84% of the alachlor and metribuzin were retained in the top 10-cm layer of soil, and at least 68% of the atrazine was retained in the top 20 cm. From 84 to 98% of the herbicide applied was lost each year, probably by microbial degradation and, for alachlor, by volatilization after application. First-order half-lives were 36 d for alachlor, 55 d for atrazine, and 32 d for metribuzin. A two-compartment model better fitting the alachlor data returned a half-life of 24 d for that herbicide.</p>
dc.description.comments <p>This article is from <em>Journal of Environmental Quality</em> 24 (1995): 68–79, doi:<a href="http://dx.doi.org/10.2134/jeq1995.00472425002400010010x" target="_blank">10.2134/jeq1995.00472425002400010010x</a>.</p>
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dc.identifier archive/lib.dr.iastate.edu/abe_eng_pubs/704/
dc.identifier.articleid 1972
dc.identifier.contextkey 7848840
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath abe_eng_pubs/704
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/1499
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/abe_eng_pubs/704/1995_Weed_DissipationDistribution.pdf|||Sat Jan 15 01:41:07 UTC 2022
dc.source.uri 10.2134/jeq1995.00472425002400010010x
dc.subject.disciplines Agricultural Science
dc.subject.disciplines Agriculture
dc.subject.disciplines Agronomy and Crop Sciences
dc.subject.disciplines Bioresource and Agricultural Engineering
dc.subject.disciplines Soil Science
dc.title Dissipation and Distribution of Herbicides in the Soil Profile
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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