Field Method for Measuring Mobile/Immobile Water Content and Solute Transfer Rate Coefficient

dc.contributor.author Jaynes, D.B.
dc.contributor.author Logsdon, S.
dc.contributor.author Horton, Robert
dc.contributor.author Horton, Robert
dc.contributor.department Agronomy
dc.date 2018-02-19T06:51:08.000
dc.date.accessioned 2020-06-29T23:04:17Z
dc.date.available 2020-06-29T23:04:17Z
dc.date.issued 1995-03-01
dc.description.abstract <p>Numerous field and laboratory studies have documented the occurrence of preferential transport of solutes due to a fraction of the soil water being immobile and not taking part in the transport process. Domain models have been developed that describe these processes, but before we can apply them routinely, we need methods for measuring the required model parameters, particularly the fraction of immobile water to total water θ<sub>lm</sub>/θ and the exchange coefficient between the mobile and immobile domains, α. We developed a field method for measuring both θ<sub>lm</sub>/θ and α. The method uses a sequence of conservative anionic tracers consisting of Br<sup>−</sup>, pentafluorobenzoate, <em>o</em>-trifluoromethylbenzoate, and 2,6-difluorobenzoate infiltrated with time through a tension infiltrometer. Previous studies have confirmed that these tracers have very similar transport properties in a wide range of soils. The method was applied to an undisturbed loam and a greenhouse soil as an initial test of the approach. Calculated θ<sub>im</sub>/θ fractions averaged 0.69 and ranged from 0.25 to 0.98, while calculated α values averaged 0.0081 h<sup>−1</sup> and ranged from 0.0030 to 0.021 h<sup>−1</sup>. These values compare well with values reported earlier by other investigators. The method is simple and allows routine measurement of transport properties of field soils. The method can also be used to validate the applicability of domain models to specific soils.</p>
dc.description.comments <p>This article is published as Jaynes, D. B., S. D. Logsdon, and R. Horton. "Field method for measuring mobile/immobile water content and solute transfer rate coefficient." Soil Science Society of America Journal 59, no. 2 (1995): 352-356. Doi: <a href="http://dx.doi.org/10.2136/sssaj1995.03615995005900020012x" target="_blank">10.2136/sssaj1995.03615995005900020012x</a>. </p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/agron_pubs/321/
dc.identifier.articleid 1320
dc.identifier.contextkey 11291805
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath agron_pubs/321
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/4667
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/agron_pubs/321/1995_Horton_FieldMethod.pdf|||Fri Jan 14 23:35:08 UTC 2022
dc.source.uri 10.2136/sssaj1995.03615995005900020012x
dc.subject.disciplines Agronomy and Crop Sciences
dc.subject.disciplines Environmental Monitoring
dc.subject.disciplines Hydrology
dc.subject.disciplines Soil Science
dc.title Field Method for Measuring Mobile/Immobile Water Content and Solute Transfer Rate Coefficient
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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