Measurement of Field Soil Hydraulic and Solute Transport Parameters

dc.contributor.author Casey, Francis
dc.contributor.author Logsdon, Sally
dc.contributor.author Horton, Robert
dc.contributor.author Horton, Robert
dc.contributor.author Jaynes, Dan
dc.contributor.department Agronomy
dc.date 2018-01-30T22:44:32.000
dc.date.accessioned 2020-06-29T23:05:05Z
dc.date.available 2020-06-29T23:05:05Z
dc.date.issued 1998
dc.description.abstract <p>Agricultural chemical presence in groundwater has drawn attention toward transport processes occurring in soil. Hydraulic conductivity (<em>K</em>) and water-holding capacity of a soil have great influence on water flow and solute transport. However, much of the chemical transport to groundwater can occur through preferential flow pathways. The simplified, preferential flow, mobile-immobile model partitions the water content (θ) into mobile (θ<sub>m</sub>) and immobile (θ<sub>im</sub>) domains, with solute exchange between the domains characterized by the mass-exchange coefficient (α). In this study a sequential tracer application technique was used and <em>K</em>, θ, θ<sub>im</sub>, and α were estimated for a series of pressure heads (<em>H</em> = 10, −30, −60, and −150 mm). This method uses a tension infiltrometer to measure both hydraulic and solute transport parameters in situ. The study took place in a no-till corn (<em>Zea mays</em> L.) field mapped as a Harps series soil (fine-loamy, mixed, mesic Typic Calciaquoll). Unsaturated values of θ and <em>K</em> were distinct from the saturated values. Similarly, though less clear cut, distinctions between saturated and unsaturated values of θ<sub>im</sub>, immobile water fraction (θ<sub>im</sub>/θ), and α were observed. The medians of θ for the sequence of decreasing <em>H</em> values were 0.40, 0.34, 0.34, and 0.33 m<sup>3</sup> m<sup>-3</sup>. The median <em>K</em> values for the same sequence of <em>H</em> were 108, 1.69, 1.51, and 0.72 µm s<sup>-1</sup>. The median θ<sub>im</sub>/θ values for the <em>H</em> sequence were 0.40, 0.28, 0.25, and 0.39. The median values of α for the <em>H</em> sequence were 0.59, 0.015, 0.0028, and 0.0029 h<sup>-1</sup>. A strong correlation between α and <em>H</em> suggests a velocity dependence of α.</p>
dc.description.comments <p>This article is published as Casey, Francis XM, Robert Horton, Sally D. Logsdon, and Dan B. Jaynes. "Measurement of field soil hydraulic and solute transport parameters." Soil Science Society of America Journal 62, no. 5 (1998): 1172-1178. doi: <a href="http://dx.doi.org/10.2136/sssaj1998.03615995006200050003x" target="_blank" title="Measurement of Field Soil Hydraulic and Solute Transport Parameters">10.2136/sssaj1998.03615995006200050003x</a>. Posted with permission.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/agron_pubs/419/
dc.identifier.articleid 1468
dc.identifier.contextkey 11445310
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath agron_pubs/419
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/4775
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/agron_pubs/419/1997_Horton_MeasurementField.pdf|||Sat Jan 15 00:11:40 UTC 2022
dc.source.uri 10.2136/sssaj1998.03615995006200050003x
dc.subject.disciplines Agriculture
dc.subject.disciplines Hydrology
dc.subject.disciplines Soil Science
dc.title Measurement of Field Soil Hydraulic and Solute Transport Parameters
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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