<?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>2007-0934</journal-id>
<journal-title><![CDATA[Revista mexicana de ciencias agrícolas]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. Mex. Cienc. Agríc]]></abbrev-journal-title>
<issn>2007-0934</issn>
<publisher>
<publisher-name><![CDATA[Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2007-09342015001002345</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Respuesta de la nochebuena (Euphorbia pulcherrima Willd. ex Klotzsch) a la relación nitrato:calcio en tres etapas fenológicas]]></article-title>
<article-title xml:lang="en"><![CDATA[Response or poinsettia (Euphorbia pulcherrima Willd ex Klotzsch) to nitrate:calcium ratio in three phenological stages]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Torres-Olivar]]></surname>
<given-names><![CDATA[Vicente]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Villegas-Torres]]></surname>
<given-names><![CDATA[Oscar G.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Valdez-Aguilar]]></surname>
<given-names><![CDATA[Luis Alonso]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Alia-Tejacal]]></surname>
<given-names><![CDATA[Irán]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[López-Martínez]]></surname>
<given-names><![CDATA[Víctor]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Trejo-Téllez]]></surname>
<given-names><![CDATA[Libia I.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Autónoma del estado de Morelos Ciencias Agropecuarias y Desarrollo Rural ]]></institution>
<addr-line><![CDATA[Cuernavaca Morelos]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Autónoma del estado de Morelos Facultad de Ciencias Agropecuarias ]]></institution>
<addr-line><![CDATA[Cuernavaca Morelos]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Autónoma Agraria Antonio Narro Departamento de Horticultura ]]></institution>
<addr-line><![CDATA[Saltillo Coahuila]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Colegio de Postgraduados Postgrado en Edafología ]]></institution>
<addr-line><![CDATA[ Estado de México]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2015</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2015</year>
</pub-date>
<volume>6</volume>
<numero>spe12</numero>
<fpage>2345</fpage>
<lpage>2357</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-09342015001002345&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-09342015001002345&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-09342015001002345&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen En el presente trabajo se determinó el efecto de la relación NO3-:Ca2+ en la solución nutritiva sobre el crecimiento y calidad de flor de nochebuena en tres etapas fenológicas (crecimiento radical, desarrollo vegetativo y pigmentación). El experimento se llevó a cabo en el campo experimental de la Facultad de Ciencias Agropecuarias de la Universidad Autónoma del estado de Morelos, Cuernavaca, Morelos. A partir de la solución nutritiva universal de Steiner se estudiaron tres concentraciones de NO3- y Ca2+ diseñadas a partir de la modificación de la concentración de NO3- con base en la relación NO3- + H2PO4- + SO42-, 12:1:7 (mol(+) m-3) y Ca2+ en la relación K+ + Ca2+ + Mg2+, 7:9:4 (mol(+) m-3). Los resultados mostraron que en la etapa de crecimiento radical es posible disminuir la concentración de NO3- de 12 a 10 mol(+) m-3 y Ca2+ de 9 a 7 mol(+) m-3, sin afectar el crecimiento de nochebuena, mientras que en la etapa de desarrollo vegetativo se debe mantener el NO3- en 10 mol(+) m-3 y aumentar el Ca2+ de 7 a 9 mol(+) m-3. Durante la etapa de pigmentación se obtuvo la mejor respuesta de las plantas con 10 mol(+) m-3 de NO3-, mientras que el Ca2+ debe ser igual que en el desarrollo vegetativo (9 mol(+) m-3).]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract In the present work was determined the effect of the relationship NO3-: Ca2+ in nutrient solution on growth and quality of poinsettia in three phenological stages (root growth, vegetative development and pigmentation). The experiment was conducted in the experimental field of the Faculty of Agricultural Sciences at the Universidad Autonoma del estado de Morelos, Cuernavaca, Morelos. From the universal Steiner nutrient solution, three concentrations of NO3-: Ca2+ were studied designed from modifying the concentration of NO3- based on the ratio NO3- + H2PO4- + SO42-, 12:1:7 ( mol(+) m-3) and Ca2+ at ratio K + + Ca2 + + Mg2+, 7:9:4 (mol(+) m-3). The results showed that at root growth is possible to decrease the concentration of NO3- from 12 to 10 mol (+) m-3 and Ca2+ from 9 to 7 mol(+) m-3, without affecting the growth of poinsettia, while in vegetative development NO3- must be maintained at 10 mol (+) m-3 and increase Ca2+ from 7 to 9 mol(+) m-3. During the pigmentation stage the best response of plants was obtained with 10 mol(+) m-3 NO3- , while Ca2+ must remain the same as than in the vegetative development (9 mol(+) m-3).]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[aniones]]></kwd>
<kwd lng="es"><![CDATA[balance nutrimental]]></kwd>
<kwd lng="es"><![CDATA[cationes]]></kwd>
<kwd lng="es"><![CDATA[relaciones mutuas]]></kwd>
<kwd lng="es"><![CDATA[soluciones nutritivas]]></kwd>
<kwd lng="en"><![CDATA[anions]]></kwd>
<kwd lng="en"><![CDATA[cations]]></kwd>
<kwd lng="en"><![CDATA[mutual relations]]></kwd>
<kwd lng="en"><![CDATA[nutritional balance]]></kwd>
<kwd lng="en"><![CDATA[nutrient solutions]]></kwd>
</kwd-group>
</article-meta>
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