<?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>2007-0705</journal-id>
<journal-title><![CDATA[Nova scientia]]></journal-title>
<abbrev-journal-title><![CDATA[Nova scientia]]></abbrev-journal-title>
<issn>2007-0705</issn>
<publisher>
<publisher-name><![CDATA[Universidad de La Salle Bajío A. C., Coordinación de Investigación]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2007-07052018000200097</article-id>
<article-id pub-id-type="doi">10.21640/ns.v10i21.1478</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Nitrate, phosphate and boron content in wastewater for crop irrigation in Mezquital Valley, Hidalgo]]></article-title>
<article-title xml:lang="es"><![CDATA[Concentración de nitrato, fosfato y boro en el agua residual para la irrigación de cultivos en Valle del Mezquital, Hidalgo]]></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>
<xref ref-type="aff" rid="Aff"/>
</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[Óscar 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[Texcoco ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad del Mar Instituto de Ecología ]]></institution>
<addr-line><![CDATA[ Oaxaca]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Autónoma de Nayarit Unidad Académica de Agricultura ]]></institution>
<addr-line><![CDATA[ Jalisco]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Universidad de Guadalajara Centro Universitario de la Costa Sur ]]></institution>
<addr-line><![CDATA[Autlán de Navarro Jalisco]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2018</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2018</year>
</pub-date>
<volume>10</volume>
<numero>21</numero>
<fpage>97</fpage>
<lpage>119</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-07052018000200097&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-07052018000200097&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-07052018000200097&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Introduction Mexico City generates an approximate volume of wastewater of 57 m3 s-1, the wastewater is conduct by the drainage network: main channel-west interceptor-central emitter, and conducted to Hidalgo State, during it course, an important volume is poured into irrigation channels and is used for crop irrigation in the Mezquital Valley.  Method In this study, nitrate (NO3-), phosphate (PO4-3) boron (B3+) and chloride (Cl-) content in 188 wastewater samples was determined. The objective was to assessment the risk of toxicity by specific ions (B3+ and Cl-) and the nutrients content (N, P, K, Ca y Mg) in wastewater used for crop irrigation.  Results The nitrate (NO3-) concentration was very heterogeneous (CV=59.83 %) and this was attributed to the lixiviation of nitrogen fertilizers. The maximum phosphate (PO4-3) value was 65.7 mg L-1, and its concentration was attributed to the discharge of household wastewater. The boron concentration (B3+) was less than 1.88 mg L-1. The risk of toxicity due to the use of wastewater in irrigation may cause a decrease the yield of sensitive crops, such as beans.  Conclusion Untreated wastewater used in irrigation in Mezquital Valley, may cause toxicity problems in some crops; the nitrate and phosphate concentrations in wastewater of the Mexico City-Mezquital Valley drainage network were high, and these were attributed to the discharges of domestic and industrial wastewaters and to agricultural drainage, high concentrations of nitrate and phosphate represent a risk for aquatic organisms due to pollution and the possible eutrophication of water bodies. The risk of toxicity by B3+ and Cl- can have a negative effect on the germination and yield of bean crops.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Introducción La Ciudad de México genera un volumen de agua de origen residual de 57 m3 s-1, esta agua se conduce por la red de drenaje: gran canal-interceptor poniente-emisor central, hacia el Estado de Hidalgo, y durante su curso, un volumen importante de esta agua se vierte en canales de riego y se utiliza en la irrigación de cultivos en Valle del Mezquital.  Método En este estudio se determinó la concentración de nitrato (NO3-), fosfato (PO43-), boro (B3+), cloruro (Cl-), calcio (Ca2+), magnesio (Mg2+) y potasio (K+) en 188 muestras de agua. El objetivo fue evaluar el riesgo de toxicidad por iones específicos (B3+ y Cl-) y el contenido de nutrientes (N, P, K, Ca y Mg) del agua residual utilizada en el riego de cultivos agrícolas.  Resultados la concentración de nitrato (NO3-) fue muy heterogénea (CV=59.83 %) y se atribuyó a la lixiviación de fertilizantes nitrogenados. El fosfato (PO43-) tuvo un valor máximo de 65.7 mg L-1, y su concentración se atribuyó a la descarga de agua residual de origen doméstico. La concentración de boro (B3+) fue menor de 1.88 mg L-1. El riesgo de toxicidad debido al uso de esta agua en la irrigación puede ocasionar la disminución en el rendimiento de cultivos sensibles como el frijol.  Conclusión el agua de origen residual sin tratamiento, utilizada en la irrigación en Valle del Mezquital, puede ocasionar problemas de toxicidad en algunos cultivos; la concentración de nitrato y fosfato en el agua residual de la red de drenaje Ciudad de México-Valle del Mezquital fue elevada, lo cual, representa riesgo para los organismos acuáticos por la contaminación y posible eutrofización de los cuerpos de agua. El riesgo de toxicidad por B3+ y Cl- puede ocasionar efectos negativos en la germinación y rendimiento del cultivo de frijol.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[calidad del agua de riego]]></kwd>
<kwd lng="es"><![CDATA[irrigación]]></kwd>
<kwd lng="es"><![CDATA[reúso del agua residual]]></kwd>
<kwd lng="es"><![CDATA[toxicidad por boro]]></kwd>
<kwd lng="en"><![CDATA[agricultural water quality]]></kwd>
<kwd lng="en"><![CDATA[boron toxicity]]></kwd>
<kwd lng="en"><![CDATA[irrigation]]></kwd>
<kwd lng="en"><![CDATA[wastewater reuse]]></kwd>
</kwd-group>
</article-meta>
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