Simulating Nitrate Drainage Losses from a Walnut Creek Watershed Field Bakhsh, Allah Hatfield, Jerry Kanwar, Rameshwar Kanwar, Ramesh Ma, Liwang Ahuja, Lajpat
dc.contributor.department Agricultural and Biosystems Engineering 2018-02-14T16:18:53.000 2020-06-29T22:40:59Z 2020-06-29T22:40:59Z 2014-09-21 2004-01-01
dc.description.abstract <p>This study was designed to evaluate the improved version of the Root Zone Water Quality Model (RZWQM) using 6 yr (1992–1997) of field-measured data from a field within Walnut Creek watershed located in central Iowa. Measured data included subsurface drainage flows, NO<sub>3</sub>–N concentrations and loads in subsurface drainage water, and corn (<em>Zea mays</em> L.) and soybean [<em>Glycine max</em> (L.) Merr.] yields. The dominant soil within this field was Webster (fine-loamy, mixed, superactive, mesic Typic Endoaquolls) and cropping system was corn–soybean rotation. The model was calibrated with 1992 data and was validated with 1993 to 1997 data. Simulations of subsurface drainage flow closely matched observed data showing model efficiency of 99% (EF = 0.99), and difference (<em>D</em>) of 1% between measured and predicted data. The model simulated NO<sub>3</sub>–N losses with subsurface drainage water reasonably well with EF = 0.8 and <em>D</em> = 13%. The simulated corn grain yields were in close agreement with measured data with <em>D</em> < 10%. Nitrogen-scenario simulations demonstrated that corn yield response function reached a plateau when N-application rate exceeded 90 kg ha<sup>−1</sup> Fraction of applied N lost with subsurface drainage water varied from 7 to 16% when N-application rate varied from 30 to 180 kg ha<sup>−1</sup> after accounting for the nitrate loss with no-fertilizer application. These results indicate that the RZWQM has the potential to simulate the impact of N application rates on corn yields and NO<sub>3</sub>–N losses with subsurface drainage flows for agricultural fields in central Iowa.</p>
dc.description.comments <p>This article is from <em>Journal of Environmental Quality</em> 33 (2004): 114–123, doi:<a href="" target="_blank">10.2134/jeq2004.1140</a>.</p>
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dc.identifier archive/
dc.identifier.articleid 1861
dc.identifier.contextkey 6143398
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath abe_eng_pubs/576
dc.language.iso en
dc.source.bitstream archive/|||Sat Jan 15 01:00:06 UTC 2022
dc.source.uri 10.2134/jeq2004.1140
dc.subject.disciplines Agriculture
dc.subject.disciplines Bioresource and Agricultural Engineering
dc.subject.disciplines Soil Science
dc.subject.disciplines Water Resource Management
dc.title Simulating Nitrate Drainage Losses from a Walnut Creek Watershed Field
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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