Immobile Water Content and Mass Exchange Coefficient of a Field Soil

dc.contributor.author Casey, F.X.M.
dc.contributor.author Horton, Robert
dc.contributor.author Horton, Robert
dc.contributor.author Logsdon, S.
dc.contributor.author Jaynes, Dan
dc.contributor.department Agronomy
dc.date 2018-02-19T06:51:29.000
dc.date.accessioned 2020-06-29T23:04:15Z
dc.date.available 2020-06-29T23:04:15Z
dc.date.issued 1997
dc.description.abstract <p>Determining the preferential flow characteristics of a soil is important because agrichemicals can contaminate groundwater via preferential flow pathways. A model that predicts solute transport due to preferential flow is the mobile-immobile solute transport model, which partitions the total water content (θ, m<sup>3</sup> m<sup>−3</sup>) into a mobile fraction (θ<sub>m</sub>) and an immobile fraction (θ<sub>im</sub>). Recently, an in situ method was proposed for determining the mobile-immobile model parameters of θ<sub>im</sub> and mass exchange coefficient (α) between the fractions by using a tension infiltrometer to apply a series of four fluorobenzoate tracers. The objective of this study was to test the in situ technique at 47 sites along a transect in a ridge-till corn (<em>Zea mays</em> L.) field of Nicollet soil (fine-loamy, mixed, mesic Aquic Hapludoll). The immobile fraction (θ<sub>im</sub> /θ) ranged from 0.394 to 0.952 with a median of 0.622. The mass exchange coefficient ranged from 0.000237 to 0.00481 min<sup>−1</sup> with a median of 0.00123 min<sup>−1</sup>. These values are similar in magnitude and range to values reported by other investigators, and they follow the same relationships. The values of θ<sub>im</sub>/θ and α along the transect indicated no obvious spatial trends or spatial correlations. Significant linear correlations did exist between α and soil water flux, α and θ<sub>im</sub>, and θ and θ<sub>im</sub>.</p>
dc.description.comments <p>This article is published as Casey, F. X. M., R. Horton, S. D. Logsdon, and D. B. Jaynes. "Immobile water content and mass exchange coefficient of a field soil." Soil Science Society of America Journal 61, no. 4 (1997): 1030-1036. Doi: <a href="http://dx.doi.org/10.2136/sssaj1997.03615995006100040006x" target="_blank">10.2136/sssaj1997.03615995006100040006x</a></p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/agron_pubs/319/
dc.identifier.articleid 1322
dc.identifier.contextkey 11292198
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath agron_pubs/319
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/4664
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/agron_pubs/319/1997_Horton_ImmobileWaterContent.pdf|||Fri Jan 14 23:32:58 UTC 2022
dc.source.uri 10.2136/sssaj1997.03615995006100040006x
dc.subject.disciplines Agricultural Science
dc.subject.disciplines Agronomy and Crop Sciences
dc.subject.disciplines Hydrology
dc.subject.disciplines Soil Science
dc.title Immobile Water Content and Mass Exchange Coefficient of a Field Soil
dc.type article
dc.type.genre article
dspace.entity.type Publication
relation.isAuthorOfPublication d3fb0917-6868-417e-9695-a010896cfafa
relation.isOrgUnitOfPublication fdd5c06c-bdbe-469c-a38e-51e664fece7a
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