Evaluation of the root zone water quality model for predicting water and NO3–N movement in an Iowa soil

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dc.contributor.author Kumar, Ajay
dc.contributor.author Kanwar, Rameshwar
dc.contributor.author Kanwar, Rameshwar
dc.contributor.author Singh, P.
dc.contributor.author Ahuja, Lajpat
dc.contributor.department Agricultural and Biosystems Engineering
dc.date 2018-02-14T16:20:38.000
dc.date.accessioned 2020-06-29T22:40:51Z
dc.date.available 2020-06-29T22:40:51Z
dc.date.embargo 2014-09-21
dc.date.issued 1999-05-01
dc.description.abstract <p>Evaluation of computer models with field data is required before they can be effectively used for predicting agricultural management systems. A study was conducted to evaluate tillage effects on the movement of water and nitrate–nitrogen (NO<sub>3</sub>–N) in the root zone under continuous corn (<em>Zea mays L.</em>) production. Four tillage treatments considered were: chisel plow (CP), moldboard plow (MP), no-tillage (NT), and ridge-tillage (RT). The root zone water quality model (RZWQM: V.3.25) was used to conduct these simulations. Three years (1990–1992) of field observed data on soil water contents and NO<sub>3</sub>–N concentrations in the soil profile were used to evaluate the performance of the model. The RZWQM usually predicted higher soil water contents compared with the observed soil water contents. The model predicted higher NO<sub>3</sub>–N concentrations in the soil profile for MP and NT treatments in comparison with CP and RT treatments, but the magnitude of simulated NO<sub>3</sub>–N peak concentrations in the soil profile were substantially different from those of the observed peaks. The average NO<sub>3</sub>–N concentrations for the entire soil profile predicted by the model were close to the observed concentrations except for ridge tillage (percent difference for CP=+5.1%, MP=+12.8%, NT=+18.4%, RT=−44.8%). Discrepancies between the simulated and observed water contents and NO<sub>3</sub>–N concentrations in the soil profile indicated a need for the calibration of plant growth component of the model further for different soil and climatic conditions to improve the N-uptake predictions of the RZWQM.</p>
dc.description.comments <p>This article is from <em>Soil and Tillage Research</em> 50 (1999): 223–236, doi:<a href="http://dx.doi.org/10.1016/S0167-1987(99)00002-1" target="_blank">10.1016/S0167-1987(99)00002-1</a>.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/abe_eng_pubs/562/
dc.identifier.articleid 1875
dc.identifier.contextkey 6144162
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath abe_eng_pubs/562
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/1342
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/abe_eng_pubs/562/1999_Kumar_EvaluationRoot.pdf|||Sat Jan 15 00:57:29 UTC 2022
dc.source.uri 10.1016/S0167-1987(99)00002-1
dc.subject.disciplines Agriculture
dc.subject.disciplines Bioresource and Agricultural Engineering
dc.subject.disciplines Soil Science
dc.subject.disciplines Water Resource Management
dc.subject.keywords Modeling
dc.subject.keywords Groundwater pollution
dc.subject.keywords Tillage practices
dc.subject.keywords RZWQM
dc.subject.keywords Nitrate-nitrogen
dc.title Evaluation of the root zone water quality model for predicting water and NO3–N movement in an Iowa soil
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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