Incorporating preferential flow and herbicide fate and transport into the drainage model

dc.contributor.author Kumar, Ajay
dc.contributor.author Kanwar, Rameshwar
dc.contributor.department Agricultural and Biosystems Engineering
dc.date 2018-02-17T05:49:22.000
dc.date.accessioned 2020-06-29T22:41:51Z
dc.date.available 2020-06-29T22:41:51Z
dc.date.copyright Wed Jan 01 00:00:00 UTC 1997
dc.date.issued 1997
dc.description.abstract <p>The DRAINAGE model was modified by incorporating a pesticide component and a preferential flow component in order to simulate pesticide concentrations in subsurface drain flows. Field data on subsurface drain flows and their atrazine concentrations were used to calibrate and validate the enhanced DRAINAGE model for growing seasons of 1990, 1991, and 1992. Simulated subsurface drain flows and their atrazine concentrations were compared with the measured values. Predicted daily flows by the modified DRAINAGE model were close to the observed values (difference over all years + 6.3%). Overall mean difference (Md) and correlation coefficient (R2) were + 0.1 mm and 0.70, respectively. The predicted atrazine concentrations in subsurface drainage water followed the observed trends well except in 1992. The overall timings of pesticide appearance in the drain water were predicted well by the model. The annual atrazine losses with subsurface drain flows predicted by the model were also in close agreement with the observed losses for 1990 and 1991 (with 1.1% difference). The results of this study indicated that the modified DRAINAGE model has good potential for simulating atrazine concentrations for normal rainfall years when a substantial amount of pesticides may be lost in the subsurface drainage water (overall Md = 2.03 ìg/kg and R2 = 0.58).</p>
dc.description.comments <p>This article was published in Transactions of the ASAE 40(4): 977–985. Posted with permission.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/abe_eng_pubs/686/
dc.identifier.articleid 1963
dc.identifier.contextkey 7838187
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath abe_eng_pubs/686
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/1478
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/abe_eng_pubs/686/1997_Kumar_IncorporatingPreferential.pdf|||Sat Jan 15 01:29:37 UTC 2022
dc.source.uri 10.13031/2013.21349
dc.subject.disciplines Agriculture
dc.subject.disciplines Bioresource and Agricultural Engineering
dc.subject.disciplines Hydrology
dc.subject.disciplines Water Resource Management
dc.subject.keywords Subsurface drain flow
dc.subject.keywords Atrazine
dc.subject.keywords DRAINAGE Model
dc.subject.keywords Simulations
dc.title Incorporating preferential flow and herbicide fate and transport into the drainage model
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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