REGIONAL NITRATE LEACHING VARIABILITY: WHAT MAKES A DIFFERENCE IN NORTHEASTERN COLORADO
Identifieur interne : 000D21 ( Istex/Corpus ); précédent : 000D20; suivant : 000D22REGIONAL NITRATE LEACHING VARIABILITY: WHAT MAKES A DIFFERENCE IN NORTHEASTERN COLORADO
Auteurs : M. D. Hall ; M. J. Shaffer ; R. M. Waskom ; J. A. DelgadoSource :
- JAWRA Journal of the American Water Resources Association [ 1093-474X ] ; 2001-02.
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Abstract
ABSTRACT: The high spatial variability of nitrate concentrations in ground water of many regions is thought to be closely related to spatially‐variable leaching rates from agricultural activities. To clarify the relative roles of the different nitrate leaching controlling variables under irrigated agriculture in northeastern Colorado, we conducted an extensive series of leaching simulations with the NLEAP model using best estimates of local agricultural practices. The results of these simulations were then used with GIS to estimate the spatial variability of leachate quality for a 14,000 ha area overlying the alluvial aquifer of the South Platte River. Simulations showed that in the study area, differences in soil type might lead to 5–10 kg/ha of N variation in annual leaching rates while variability due to crop rotations was as much as 65 kg‐N/ha for common rotations. Land application of manure from confined animal feeding operations may account for more than 100 kg‐N/ha additional leaching. For a selected index rotation, the simulated nitrogen leaching rates across the area varied from 10 to 299 kg/ha and simulated water volumes leached ranged from 13 to 76 cm/yr depending on soil type, irrigation type, and use of manure. Resulting leachate concentrations of 3.5–140 mg/l NO3 as N were simulated. Land application of manure was found to be the most important factor determining the mass flux of nitrate leached and the combination of sprinkler irrigation and manure application yields the highest leachate concentrations.
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DOI: 10.1111/j.1752-1688.2001.tb05481.x
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Shaffer</name><affiliation><mods:affiliation>Respectively, Project Engineer, CH2M‐Hill, 2525 Airpark Drive, Redding, California 96049; Soil Scientist, USDA‐ARS, Great Plains Systems Research Unit, P.O. Box E, Fort Collins, Colorado 80522; Water Quality Specialist, Colorado State University Cooperative Extension, Colorado State University, Fort Collins, Colorado 80523; Soil Scientist, USDA‐ARS, Soil‐Plant‐Nutrient Research Unit, P.O. Box E, Fort Collins, Colorado 80522 (E‐Mail/Hall: mhall@ch2m.com).</mods:affiliation></affiliation></author><author><name sortKey="Waskom, R M" sort="Waskom, R M" uniqKey="Waskom R" first="R. M." last="Waskom">R. M. Waskom</name><affiliation><mods:affiliation>Respectively, Project Engineer, CH2M‐Hill, 2525 Airpark Drive, Redding, California 96049; Soil Scientist, USDA‐ARS, Great Plains Systems Research Unit, P.O. Box E, Fort Collins, Colorado 80522; Water Quality Specialist, Colorado State University Cooperative Extension, Colorado State University, Fort Collins, Colorado 80523; Soil Scientist, USDA‐ARS, Soil‐Plant‐Nutrient Research Unit, P.O. Box E, Fort Collins, Colorado 80522 (E‐Mail/Hall: mhall@ch2m.com).</mods:affiliation></affiliation></author><author><name sortKey="Delgado, J A" sort="Delgado, J A" uniqKey="Delgado J" first="J. A." last="Delgado">J. A. Delgado</name><affiliation><mods:affiliation>Respectively, Project Engineer, CH2M‐Hill, 2525 Airpark Drive, Redding, California 96049; Soil Scientist, USDA‐ARS, Great Plains Systems Research Unit, P.O. Box E, Fort Collins, Colorado 80522; Water Quality Specialist, Colorado State University Cooperative Extension, Colorado State University, Fort Collins, Colorado 80523; Soil Scientist, USDA‐ARS, Soil‐Plant‐Nutrient Research Unit, P.O. 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Hall</name><affiliation><mods:affiliation>Respectively, Project Engineer, CH2M‐Hill, 2525 Airpark Drive, Redding, California 96049; Soil Scientist, USDA‐ARS, Great Plains Systems Research Unit, P.O. Box E, Fort Collins, Colorado 80522; Water Quality Specialist, Colorado State University Cooperative Extension, Colorado State University, Fort Collins, Colorado 80523; Soil Scientist, USDA‐ARS, Soil‐Plant‐Nutrient Research Unit, P.O. Box E, Fort Collins, Colorado 80522 (E‐Mail/Hall: mhall@ch2m.com).</mods:affiliation></affiliation></author><author><name sortKey="Shaffer, M J" sort="Shaffer, M J" uniqKey="Shaffer M" first="M. J." last="Shaffer">M. J. Shaffer</name><affiliation><mods:affiliation>Respectively, Project Engineer, CH2M‐Hill, 2525 Airpark Drive, Redding, California 96049; Soil Scientist, USDA‐ARS, Great Plains Systems Research Unit, P.O. Box E, Fort Collins, Colorado 80522; Water Quality Specialist, Colorado State University Cooperative Extension, Colorado State University, Fort Collins, Colorado 80523; Soil Scientist, USDA‐ARS, Soil‐Plant‐Nutrient Research Unit, P.O. Box E, Fort Collins, Colorado 80522 (E‐Mail/Hall: mhall@ch2m.com).</mods:affiliation></affiliation></author><author><name sortKey="Waskom, R M" sort="Waskom, R M" uniqKey="Waskom R" first="R. M." last="Waskom">R. M. Waskom</name><affiliation><mods:affiliation>Respectively, Project Engineer, CH2M‐Hill, 2525 Airpark Drive, Redding, California 96049; Soil Scientist, USDA‐ARS, Great Plains Systems Research Unit, P.O. Box E, Fort Collins, Colorado 80522; Water Quality Specialist, Colorado State University Cooperative Extension, Colorado State University, Fort Collins, Colorado 80523; Soil Scientist, USDA‐ARS, Soil‐Plant‐Nutrient Research Unit, P.O. Box E, Fort Collins, Colorado 80522 (E‐Mail/Hall: mhall@ch2m.com).</mods:affiliation></affiliation></author><author><name sortKey="Delgado, J A" sort="Delgado, J A" uniqKey="Delgado J" first="J. A." last="Delgado">J. A. Delgado</name><affiliation><mods:affiliation>Respectively, Project Engineer, CH2M‐Hill, 2525 Airpark Drive, Redding, California 96049; Soil Scientist, USDA‐ARS, Great Plains Systems Research Unit, P.O. Box E, Fort Collins, Colorado 80522; Water Quality Specialist, Colorado State University Cooperative Extension, Colorado State University, Fort Collins, Colorado 80523; Soil Scientist, USDA‐ARS, Soil‐Plant‐Nutrient Research Unit, P.O. Box E, Fort Collins, Colorado 80522 (E‐Mail/Hall: mhall@ch2m.com).</mods:affiliation></affiliation></author></analytic><monogr></monogr><series><title level="j">JAWRA Journal of the American Water Resources Association</title><idno type="ISSN">1093-474X</idno><idno type="eISSN">1752-1688</idno><imprint><publisher>Blackwell Publishing Ltd</publisher><pubPlace>Oxford, UK</pubPlace><date type="published" when="2001-02">2001-02</date><biblScope unit="volume">37</biblScope><biblScope unit="issue">1</biblScope><biblScope unit="page" from="139">139</biblScope><biblScope unit="page" to="150">150</biblScope></imprint><idno type="ISSN">1093-474X</idno></series><idno type="istex">358BBA9A2D3E2EA9D780D139F1C99B16FEF9828B</idno><idno type="DOI">10.1111/j.1752-1688.2001.tb05481.x</idno><idno type="ArticleID">JAWR139</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">1093-474X</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>GIS</term><term>NLEA.P</term><term>agricultural hydrology</term><term>irrigation</term><term>nonpoint source pollution</term><term>pollution modeling</term><term>spatial variability.)</term></keywords></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract">ABSTRACT: The high spatial variability of nitrate concentrations in ground water of many regions is thought to be closely related to spatially‐variable leaching rates from agricultural activities. To clarify the relative roles of the different nitrate leaching controlling variables under irrigated agriculture in northeastern Colorado, we conducted an extensive series of leaching simulations with the NLEAP model using best estimates of local agricultural practices. The results of these simulations were then used with GIS to estimate the spatial variability of leachate quality for a 14,000 ha area overlying the alluvial aquifer of the South Platte River. Simulations showed that in the study area, differences in soil type might lead to 5–10 kg/ha of N variation in annual leaching rates while variability due to crop rotations was as much as 65 kg‐N/ha for common rotations. Land application of manure from confined animal feeding operations may account for more than 100 kg‐N/ha additional leaching. For a selected index rotation, the simulated nitrogen leaching rates across the area varied from 10 to 299 kg/ha and simulated water volumes leached ranged from 13 to 76 cm/yr depending on soil type, irrigation type, and use of manure. Resulting leachate concentrations of 3.5–140 mg/l NO3 as N were simulated. Land application of manure was found to be the most important factor determining the mass flux of nitrate leached and the combination of sprinkler irrigation and manure application yields the highest leachate concentrations.</div></front></TEI><istex><corpusName>wiley</corpusName><author><json:item><name>M. D. Hall</name><affiliations><json:string>Respectively, Project Engineer, CH2M‐Hill, 2525 Airpark Drive, Redding, California 96049; Soil Scientist, USDA‐ARS, Great Plains Systems Research Unit, P.O. Box E, Fort Collins, Colorado 80522; Water Quality Specialist, Colorado State University Cooperative Extension, Colorado State University, Fort Collins, Colorado 80523; Soil Scientist, USDA‐ARS, Soil‐Plant‐Nutrient Research Unit, P.O. Box E, Fort Collins, Colorado 80522 (E‐Mail/Hall: mhall@ch2m.com).</json:string></affiliations></json:item><json:item><name>M. J. Shaffer</name><affiliations><json:string>Respectively, Project Engineer, CH2M‐Hill, 2525 Airpark Drive, Redding, California 96049; Soil Scientist, USDA‐ARS, Great Plains Systems Research Unit, P.O. Box E, Fort Collins, Colorado 80522; Water Quality Specialist, Colorado State University Cooperative Extension, Colorado State University, Fort Collins, Colorado 80523; Soil Scientist, USDA‐ARS, Soil‐Plant‐Nutrient Research Unit, P.O. Box E, Fort Collins, Colorado 80522 (E‐Mail/Hall: mhall@ch2m.com).</json:string></affiliations></json:item><json:item><name>R. M. Waskom</name><affiliations><json:string>Respectively, Project Engineer, CH2M‐Hill, 2525 Airpark Drive, Redding, California 96049; Soil Scientist, USDA‐ARS, Great Plains Systems Research Unit, P.O. Box E, Fort Collins, Colorado 80522; Water Quality Specialist, Colorado State University Cooperative Extension, Colorado State University, Fort Collins, Colorado 80523; Soil Scientist, USDA‐ARS, Soil‐Plant‐Nutrient Research Unit, P.O. Box E, Fort Collins, Colorado 80522 (E‐Mail/Hall: mhall@ch2m.com).</json:string></affiliations></json:item><json:item><name>J. A. Delgado</name><affiliations><json:string>Respectively, Project Engineer, CH2M‐Hill, 2525 Airpark Drive, Redding, California 96049; Soil Scientist, USDA‐ARS, Great Plains Systems Research Unit, P.O. Box E, Fort Collins, Colorado 80522; Water Quality Specialist, Colorado State University Cooperative Extension, Colorado State University, Fort Collins, Colorado 80523; Soil Scientist, USDA‐ARS, Soil‐Plant‐Nutrient Research Unit, P.O. Box E, Fort Collins, Colorado 80522 (E‐Mail/Hall: mhall@ch2m.com).</json:string></affiliations></json:item></author><subject><json:item><lang><json:string>eng</json:string></lang><value>nonpoint source pollution</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>pollution modeling</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>agricultural hydrology</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>NLEA.P</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>GIS</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>irrigation</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>spatial variability.)</value></json:item></subject><articleId><json:string>JAWR139</json:string></articleId><language><json:string>eng</json:string></language><originalGenre><json:string>article</json:string></originalGenre><abstract>ABSTRACT: The high spatial variability of nitrate concentrations in ground water of many regions is thought to be closely related to spatially‐variable leaching rates from agricultural activities. To clarify the relative roles of the different nitrate leaching controlling variables under irrigated agriculture in northeastern Colorado, we conducted an extensive series of leaching simulations with the NLEAP model using best estimates of local agricultural practices. The results of these simulations were then used with GIS to estimate the spatial variability of leachate quality for a 14,000 ha area overlying the alluvial aquifer of the South Platte River. Simulations showed that in the study area, differences in soil type might lead to 5–10 kg/ha of N variation in annual leaching rates while variability due to crop rotations was as much as 65 kg‐N/ha for common rotations. Land application of manure from confined animal feeding operations may account for more than 100 kg‐N/ha additional leaching. For a selected index rotation, the simulated nitrogen leaching rates across the area varied from 10 to 299 kg/ha and simulated water volumes leached ranged from 13 to 76 cm/yr depending on soil type, irrigation type, and use of manure. Resulting leachate concentrations of 3.5–140 mg/l NO3 as N were simulated. 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D.</forename><surname>Hall</surname></persName><affiliation>Respectively, Project Engineer, CH2M‐Hill, 2525 Airpark Drive, Redding, California 96049; Soil Scientist, USDA‐ARS, Great Plains Systems Research Unit, P.O. Box E, Fort Collins, Colorado 80522; Water Quality Specialist, Colorado State University Cooperative Extension, Colorado State University, Fort Collins, Colorado 80523; Soil Scientist, USDA‐ARS, Soil‐Plant‐Nutrient Research Unit, P.O. Box E, Fort Collins, Colorado 80522 (E‐Mail/Hall: mhall@ch2m.com).</affiliation></author><author xml:id="author-2"><persName><forename type="first">M. J.</forename><surname>Shaffer</surname></persName><affiliation>Respectively, Project Engineer, CH2M‐Hill, 2525 Airpark Drive, Redding, California 96049; Soil Scientist, USDA‐ARS, Great Plains Systems Research Unit, P.O. 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To clarify the relative roles of the different nitrate leaching controlling variables under irrigated agriculture in northeastern Colorado, we conducted an extensive series of leaching simulations with the NLEAP model using best estimates of local agricultural practices. The results of these simulations were then used with GIS to estimate the spatial variability of leachate quality for a 14,000 ha area overlying the alluvial aquifer of the South Platte River. Simulations showed that in the study area, differences in soil type might lead to 5–10 kg/ha of N variation in annual leaching rates while variability due to crop rotations was as much as 65 kg‐N/ha for common rotations. Land application of manure from confined animal feeding operations may account for more than 100 kg‐N/ha additional leaching. For a selected index rotation, the simulated nitrogen leaching rates across the area varied from 10 to 299 kg/ha and simulated water volumes leached ranged from 13 to 76 cm/yr depending on soil type, irrigation type, and use of manure. Resulting leachate concentrations of 3.5–140 mg/l NO3 as N were simulated. Land application of manure was found to be the most important factor determining the mass flux of nitrate leached and the combination of sprinkler irrigation and manure application yields the highest leachate concentrations.</p></abstract><textClass xml:lang="en"><keywords scheme="keyword"><list><head>keywords</head><item><term>nonpoint source pollution</term></item><item><term>pollution modeling</term></item><item><term>agricultural hydrology</term></item><item><term>NLEA.P</term></item><item><term>GIS</term></item><item><term>irrigation</term></item><item><term>spatial variability.)</term></item></list></keywords></textClass></profileDesc><revisionDesc><change when="2001-02">Published</change></revisionDesc></teiHeader></istex:fulltextTEI><json:item><extension>txt</extension><original>false</original><mimetype>text/plain</mimetype><uri>https://api.istex.fr/document/358BBA9A2D3E2EA9D780D139F1C99B16FEF9828B/fulltext/txt</uri></json:item></fulltext><metadata><istex:metadataXml wicri:clean="Wiley, elements deleted: body"><istex:xmlDeclaration>version="1.0" encoding="UTF-8" standalone="yes"</istex:xmlDeclaration><istex:document><component version="2.0" type="serialArticle" xml:lang="en"><header><publicationMeta level="product"><publisherInfo><publisherName>Blackwell Publishing Ltd</publisherName><publisherLoc>Oxford, UK</publisherLoc></publisherInfo><doi origin="wiley" registered="yes">10.1111/(ISSN)1752-1688</doi><issn type="print">1093-474X</issn><issn type="electronic">1752-1688</issn><idGroup><id type="product" value="JAWR"></id><id type="publisherDivision" value="ST"></id></idGroup><titleGroup><title type="main" sort="JOURNAL OF AMERICAN WATER RESOURCES ASSOCIATION">JAWRA Journal of the American Water Resources Association</title></titleGroup></publicationMeta><publicationMeta level="part" position="02001"><doi origin="wiley">10.1111/jawr.2001.37.issue-1</doi><numberingGroup><numbering type="journalVolume" number="37">37</numbering><numbering type="journalIssue" number="1">1</numbering></numberingGroup><coverDate startDate="2001-02">February 2001</coverDate></publicationMeta><publicationMeta level="unit" type="article" position="0013900" status="forIssue"><doi origin="wiley">10.1111/j.1752-1688.2001.tb05481.x</doi><idGroup><id type="unit" value="JAWR139"></id></idGroup><countGroup><count type="pageTotal" number="12"></count></countGroup><eventGroup><event type="firstOnline" date="2007-06-08"></event><event type="publishedOnlineFinalForm" date="2007-06-08"></event><event type="xmlConverted" agent="Converter:BPG_TO_WML3G version:2.3.2 mode:FullText source:HeaderRef result:HeaderRef" date="2010-03-06"></event><event type="xmlConverted" agent="Converter:WILEY_ML3G_TO_WILEY_ML3GV2 version:3.8.8" date="2014-01-28"></event><event type="xmlConverted" agent="Converter:WML3G_To_WML3G version:4.1.7 mode:FullText,remove_FC" date="2014-10-23"></event></eventGroup><numberingGroup><numbering type="pageFirst" number="139">139</numbering><numbering type="pageLast" number="150">150</numbering></numberingGroup><linkGroup><link type="toTypesetVersion" href="file:JAWR.JAWR139.pdf"></link></linkGroup></publicationMeta><contentMeta><countGroup><count type="referenceTotal" number="26"></count><count type="linksCrossRef" number="4"></count></countGroup><titleGroup><title type="main">REGIONAL NITRATE LEACHING VARIABILITY: WHAT MAKES A DIFFERENCE IN NORTHEASTERN COLORADO</title></titleGroup><creators><creator creatorRole="author" xml:id="cr1" affiliationRef="#a1"><personName><givenNames>M. D.</givenNames><familyName>Hall</familyName></personName></creator><creator creatorRole="author" xml:id="cr2" affiliationRef="#a1"><personName><givenNames>M. J.</givenNames><familyName>Shaffer</familyName></personName></creator><creator creatorRole="author" xml:id="cr3" affiliationRef="#a1"><personName><givenNames>R. M.</givenNames><familyName>Waskom</familyName></personName></creator><creator creatorRole="author" xml:id="cr4" affiliationRef="#a1"><personName><givenNames>J. A.</givenNames><familyName>Delgado</familyName></personName></creator></creators><affiliationGroup><affiliation xml:id="a1"><unparsedAffiliation> Respectively, Project Engineer, CH2M‐Hill, 2525 Airpark Drive, Redding, California 96049; Soil Scientist, USDA‐ARS, Great Plains Systems Research Unit, P.O. Box E, Fort Collins, Colorado 80522; Water Quality Specialist, Colorado State University Cooperative Extension, Colorado State University, Fort Collins, Colorado 80523; Soil Scientist, USDA‐ARS, Soil‐Plant‐Nutrient Research Unit, P.O. Box E, Fort Collins, Colorado 80522 (E‐Mail/Hall: <email>mhall@ch2m.com</email>).</unparsedAffiliation></affiliation></affiliationGroup><keywordGroup xml:lang="en"><keyword xml:id="k1">nonpoint source pollution</keyword><keyword xml:id="k2">pollution modeling</keyword><keyword xml:id="k3">agricultural hydrology</keyword><keyword xml:id="k4">NLEA.P</keyword><keyword xml:id="k5">GIS</keyword><keyword xml:id="k6">irrigation</keyword><keyword xml:id="k7">spatial variability.)</keyword></keywordGroup><abstractGroup><abstract type="main" xml:lang="en"><p><b>ABSTRACT: </b> The high spatial variability of nitrate concentrations in ground water of many regions is thought to be closely related to spatially‐variable leaching rates from agricultural activities. To clarify the relative roles of the different nitrate leaching controlling variables under irrigated agriculture in northeastern Colorado, we conducted an extensive series of leaching simulations with the NLEAP model using best estimates of local agricultural practices. The results of these simulations were then used with GIS to estimate the spatial variability of leachate quality for a 14,000 ha area overlying the alluvial aquifer of the South Platte River. Simulations showed that in the study area, differences in soil type might lead to 5–10 kg/ha of N variation in annual leaching rates while variability due to crop rotations was as much as 65 kg‐N/ha for common rotations. Land application of manure from confined animal feeding operations may account for more than 100 kg‐N/ha additional leaching. For a selected index rotation, the simulated nitrogen leaching rates across the area varied from 10 to 299 kg/ha and simulated water volumes leached ranged from 13 to 76 cm/yr depending on soil type, irrigation type, and use of manure. Resulting leachate concentrations of 3.5–140 mg/l NO<sub>3</sub> as N were simulated. Land application of manure was found to be the most important factor determining the mass flux of nitrate leached and the combination of sprinkler irrigation and manure application yields the highest leachate concentrations.</p></abstract></abstractGroup></contentMeta><noteGroup><note xml:id="fn1"><label>1</label><p>Paper No. 99063 of the <i>Journal of the American Water Resources Association.</i><b>Discussions are open until October 1, 2001.</b></p></note></noteGroup></header></component></istex:document></istex:metadataXml><mods version="3.6"><titleInfo lang="en"><title>REGIONAL NITRATE LEACHING VARIABILITY: WHAT MAKES A DIFFERENCE IN NORTHEASTERN COLORADO</title></titleInfo><titleInfo type="alternative" contentType="CDATA" lang="en"><title>REGIONAL NITRATE LEACHING VARIABILITY: WHAT MAKES A DIFFERENCE IN NORTHEASTERN COLORADO</title></titleInfo><name type="personal"><namePart type="given">M. D.</namePart><namePart type="family">Hall</namePart><affiliation>Respectively, Project Engineer, CH2M‐Hill, 2525 Airpark Drive, Redding, California 96049; Soil Scientist, USDA‐ARS, Great Plains Systems Research Unit, P.O. Box E, Fort Collins, Colorado 80522; Water Quality Specialist, Colorado State University Cooperative Extension, Colorado State University, Fort Collins, Colorado 80523; Soil Scientist, USDA‐ARS, Soil‐Plant‐Nutrient Research Unit, P.O. Box E, Fort Collins, Colorado 80522 (E‐Mail/Hall: mhall@ch2m.com).</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">M. J.</namePart><namePart type="family">Shaffer</namePart><affiliation>Respectively, Project Engineer, CH2M‐Hill, 2525 Airpark Drive, Redding, California 96049; Soil Scientist, USDA‐ARS, Great Plains Systems Research Unit, P.O. Box E, Fort Collins, Colorado 80522; Water Quality Specialist, Colorado State University Cooperative Extension, Colorado State University, Fort Collins, Colorado 80523; Soil Scientist, USDA‐ARS, Soil‐Plant‐Nutrient Research Unit, P.O. Box E, Fort Collins, Colorado 80522 (E‐Mail/Hall: mhall@ch2m.com).</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">R. M.</namePart><namePart type="family">Waskom</namePart><affiliation>Respectively, Project Engineer, CH2M‐Hill, 2525 Airpark Drive, Redding, California 96049; Soil Scientist, USDA‐ARS, Great Plains Systems Research Unit, P.O. Box E, Fort Collins, Colorado 80522; Water Quality Specialist, Colorado State University Cooperative Extension, Colorado State University, Fort Collins, Colorado 80523; Soil Scientist, USDA‐ARS, Soil‐Plant‐Nutrient Research Unit, P.O. Box E, Fort Collins, Colorado 80522 (E‐Mail/Hall: mhall@ch2m.com).</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">J. A.</namePart><namePart type="family">Delgado</namePart><affiliation>Respectively, Project Engineer, CH2M‐Hill, 2525 Airpark Drive, Redding, California 96049; Soil Scientist, USDA‐ARS, Great Plains Systems Research Unit, P.O. Box E, Fort Collins, Colorado 80522; Water Quality Specialist, Colorado State University Cooperative Extension, Colorado State University, Fort Collins, Colorado 80523; Soil Scientist, USDA‐ARS, Soil‐Plant‐Nutrient Research Unit, P.O. Box E, Fort Collins, Colorado 80522 (E‐Mail/Hall: mhall@ch2m.com).</affiliation><role><roleTerm type="text">author</roleTerm></role></name><typeOfResource>text</typeOfResource><genre type="article" displayLabel="article"></genre><originInfo><publisher>Blackwell Publishing Ltd</publisher><place><placeTerm type="text">Oxford, UK</placeTerm></place><dateIssued encoding="w3cdtf">2001-02</dateIssued><copyrightDate encoding="w3cdtf">2001</copyrightDate></originInfo><language><languageTerm type="code" authority="rfc3066">en</languageTerm><languageTerm type="code" authority="iso639-2b">eng</languageTerm></language><physicalDescription><internetMediaType>text/html</internetMediaType><extent unit="references">26</extent></physicalDescription><abstract>ABSTRACT: The high spatial variability of nitrate concentrations in ground water of many regions is thought to be closely related to spatially‐variable leaching rates from agricultural activities. To clarify the relative roles of the different nitrate leaching controlling variables under irrigated agriculture in northeastern Colorado, we conducted an extensive series of leaching simulations with the NLEAP model using best estimates of local agricultural practices. The results of these simulations were then used with GIS to estimate the spatial variability of leachate quality for a 14,000 ha area overlying the alluvial aquifer of the South Platte River. Simulations showed that in the study area, differences in soil type might lead to 5–10 kg/ha of N variation in annual leaching rates while variability due to crop rotations was as much as 65 kg‐N/ha for common rotations. Land application of manure from confined animal feeding operations may account for more than 100 kg‐N/ha additional leaching. For a selected index rotation, the simulated nitrogen leaching rates across the area varied from 10 to 299 kg/ha and simulated water volumes leached ranged from 13 to 76 cm/yr depending on soil type, irrigation type, and use of manure. Resulting leachate concentrations of 3.5–140 mg/l NO3 as N were simulated. Land application of manure was found to be the most important factor determining the mass flux of nitrate leached and the combination of sprinkler irrigation and manure application yields the highest leachate concentrations.</abstract><subject lang="en"><genre>keywords</genre><topic>nonpoint source pollution</topic><topic>pollution modeling</topic><topic>agricultural hydrology</topic><topic>NLEA.P</topic><topic>GIS</topic><topic>irrigation</topic><topic>spatial variability.)</topic></subject><relatedItem type="host"><titleInfo><title>JAWRA Journal of the American Water Resources Association</title></titleInfo><genre type="journal">journal</genre><identifier type="ISSN">1093-474X</identifier><identifier type="eISSN">1752-1688</identifier><identifier type="DOI">10.1111/(ISSN)1752-1688</identifier><identifier type="PublisherID">JAWR</identifier><part><date>2001</date><detail type="volume"><caption>vol.</caption><number>37</number></detail><detail type="issue"><caption>no.</caption><number>1</number></detail><extent unit="pages"><start>139</start><end>150</end><total>12</total></extent></part></relatedItem><identifier type="istex">358BBA9A2D3E2EA9D780D139F1C99B16FEF9828B</identifier><identifier type="DOI">10.1111/j.1752-1688.2001.tb05481.x</identifier><identifier type="ArticleID">JAWR139</identifier><recordInfo><recordContentSource>WILEY</recordContentSource><recordOrigin>Blackwell Publishing Ltd</recordOrigin></recordInfo></mods></metadata><serie></serie></istex></record>Pour manipuler ce document sous Unix (Dilib)
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