<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>2007-9028</journal-id>
<journal-title><![CDATA[Ecosistemas y recursos agropecuarios]]></journal-title>
<abbrev-journal-title><![CDATA[Ecosistemas y recur. agropecuarios]]></abbrev-journal-title>
<issn>2007-9028</issn>
<publisher>
<publisher-name><![CDATA[Universidad Juárez Autónoma de Tabasco, Dirección de Investigación y Posgrado]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2007-90282019000100175</article-id>
<article-id pub-id-type="doi">10.19136/era.a6n16.1829</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Concentración de nitrato, fosfato, boro y cloruro en el agua del río Lerma]]></article-title>
<article-title xml:lang="en"><![CDATA[Concentration of nitrate, phosphate, boron and chloride in the Lerma River]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pérez-Díaz]]></surname>
<given-names><![CDATA[José Pedro]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ortega-Escobar]]></surname>
<given-names><![CDATA[Héctor Manuel]]></given-names>
</name>
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</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ramírez-Ayala]]></surname>
<given-names><![CDATA[Carlos]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Flores-Magdaleno]]></surname>
<given-names><![CDATA[Héctor]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sánchez-Bernal]]></surname>
<given-names><![CDATA[Edgar Iván]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Can-Chulim]]></surname>
<given-names><![CDATA[Álvaro]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mancilla-Villa]]></surname>
<given-names><![CDATA[Oscar Raúl]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Colegio de Postgraduados Posgrado de Hidrociencias ]]></institution>
<addr-line><![CDATA[Montecillo Texcoco Estado de México]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad del Mar Departamento de Ecología ]]></institution>
<addr-line><![CDATA[Puerto Ángel, Pochutla Oaxaca]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Autónoma de Nayarit Unidad Académica de Agricultura ]]></institution>
<addr-line><![CDATA[Xalisco Nayarit]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Universidad de Guadalajara Centro Universitario de la Costa Sur Departamento de Producción Agrícola]]></institution>
<addr-line><![CDATA[Autlán de Navarro Jalisco]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>04</month>
<year>2019</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>04</month>
<year>2019</year>
</pub-date>
<volume>6</volume>
<numero>16</numero>
<fpage>175</fpage>
<lpage>182</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-90282019000100175&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-90282019000100175&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-90282019000100175&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN: El río Lerma se origina en la laguna de Almoloya, Estado de México y desemboca en el Lago de Chapala, Jalisco. El objetivo fue conocer la concentración de nitrato (NO3-), fosfato (PO4 3-), boro (B3+) y cloruro (Cl-) en el río Lerma para estimar el riesgo de toxicidad de algunos cultivos irrigados con sus aguas. El promedio de concentración para el NO3- fue de 27.48 mg L-1, para PO4 3- de 4.027 mg L-1, para B3+ de 0.496 mg L-1 y para Cl- de 1.974 meq L-1. El coeficiente de variación indica alta heterogeneidad en la concentración iónica del agua, atribuida a las descargas de agua residual doméstica, industrial y drenaje agrícola. El río Lerma tiene diferente grado de restricción de uso con respecto al riesgo de toxicidad por iones específicos.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT: The Lerma River originates in the Almoloya Lagoon, State of Mexico and empties into Lake Chapala, Jalisco. The objective of this study was to determine the concentration of nitrate (NO3-), phosphate (PO4 3-), boron (B3+) and chloride (Cl-) in the Lerma River to estimate the risk of toxicity of some crops irrigated with its waters. The average concentration was 27.48 mg L-1 for NO3-, 4.027 mg L-1 for PO4 3-, 0.496 mg L-1 for B3+ and 1.974 meq L-1 for Cl-. The coefficient of variation indicates high heterogeneity in the ionic concentration of the water, attributed to discharges of domestic, industrial and agricultural drainage wastewater. The Lerma River has a different degree of restriction of use with respect to the risk of specific ion toxicity.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Calidad del agua]]></kwd>
<kwd lng="es"><![CDATA[riego agrícola]]></kwd>
<kwd lng="es"><![CDATA[toxicidad por iones específicos]]></kwd>
<kwd lng="en"><![CDATA[Water quality]]></kwd>
<kwd lng="en"><![CDATA[agricultural irrigation]]></kwd>
<kwd lng="en"><![CDATA[specific ion toxicity]]></kwd>
</kwd-group>
</article-meta>
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