<?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>0187-7380</journal-id>
<journal-title><![CDATA[Revista fitotecnia mexicana]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. fitotec. mex]]></abbrev-journal-title>
<issn>0187-7380</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Mexicana de Fitogenética A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0187-73802021000200191</article-id>
<article-id pub-id-type="doi">10.35196/rfm.2021.2.191</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Nitrógeno en fertirriego para producir semilla de líneas progenitoras y cruzas simples de maíz: dosis y distribución]]></article-title>
<article-title xml:lang="en"><![CDATA[Nitrogen in fertigation to produce seed of parental lines and single crosses of maize: dose and distribution]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Zepeda-Bautista]]></surname>
<given-names><![CDATA[Rosalba]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Virgen-Vargas]]></surname>
<given-names><![CDATA[Juan]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Suazo-López]]></surname>
<given-names><![CDATA[Francisco]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Arellano-Vázquez]]></surname>
<given-names><![CDATA[José L.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ávila-Perches]]></surname>
<given-names><![CDATA[Miguel Á.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto Politécnico Nacional Unidad Profesional &#8216;Adolfo López Mateos&#8217; Escuela Superior de Ingeniería Mecánica y Eléctrica]]></institution>
<addr-line><![CDATA[ Ciudad de México]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Instituto Nacional de Investigaciones Forestales Agrícolas y Pecuarias Campo Experimental Valle de México ]]></institution>
<addr-line><![CDATA[Coatlinchán Estado de México]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Autónoma Chapingo Departamento de Preparatoria Agrícola ]]></institution>
<addr-line><![CDATA[Chapingo Estado de México]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias Campo Experimental Bajío ]]></institution>
<addr-line><![CDATA[Celaya Guanajuato]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2021</year>
</pub-date>
<volume>44</volume>
<numero>2</numero>
<fpage>191</fpage>
<lpage>200</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0187-73802021000200191&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0187-73802021000200191&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0187-73802021000200191&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN El costo y el impacto al ambiente por aplicar fertilizante nitrogenado para producir semilla híbrida de maíz (Zea mays L.) son elevados y opuestos al desarrollo sustentable. La dosis, distribución y forma de aplicación son limitadas; por ello, se evaluó la aplicación del N en fertirriego y su efecto en el rendimiento de semilla en líneas y cruzas simples progenitoras de híbridos. En 2013 y 2014 se evaluaron las líneas M-54, M-55 y CML-242, las cruzas simples M-54×M-55 y M-55×M-54 y el híbrido H-70, con las dosis de N 150, 225 y 300 kg ha-1 en un diseño de bloques completos al azar. La distribución de las dosis 150, 225 y 300-600P-30K se realizó durante el ciclo biológico. Las diferencias entre genotipos, dosis de N y años fueron significativas estadísticamente (P &#8804; 0.01) para inicio de floración masculina (IFM) y femenina (IFF) y rendimiento de semilla. Hubo diferencias de 7 a 11 d entre M-54 y M-55 para IFM e IFF, y de 3 a 5 d entre M-54×M-55 y CML-242. Líneas y cruzas simples rindieron en promedio 3.28 y 8.44 Mg ha-1, respectivamente. Las dosis de 225 y 300 kg N ha-1 en fertirriego retrasaron el IFM e IFF en promedio entre 1 y 3 d, en comparación con 150 kg N ha-1, que tuvo un rendimiento promedio de 6.37 Mg ha-1. En 2013 el IFM e IFF aumentó en 4 y 2, d mientras que el rendimiento disminuyó en 3% en comparación con 2014. La línea M-55 con 225 kg N ha-1 en 2013 rindió 25% más que con 150 kg N ha-1. La aplicación de 150 kg N ha-1 en fertirriego incrementa la producción de semilla y las dosis de 225 y 300 kg ha-1 de N retrasan la floración.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[SUMMARY The cost and the environmental impact of applying nitrogen fertilizer to produce hybrid maize (Zea mays L.) seed are high and opposed to sustainable development. The dose, distribution and form of applications are limited; thus, the application of N in fertigation and its effect on seed yield in parental lines and single crosses of maize hybrid were evaluated. In 2013 and 2014 lines M-54, M-55 and CML-242, single crosses M-54×M-55 and M-55×M-54, and the hybrid H-70 were evaluated with the doses of N 150, 225 and 300 kg ha-1 in a randomized complete block design. The distribution of doses 150, 225 and 300N-60P-30K was carried through the biological cycle. Differences between genotypes, doses of N and years were statistically significant (P &#8804; 0.01) for initiation of male (IMF) and female (IFF) flowering and seed yield. There was a difference of 7 to 11 days between M-54 and M-55 for IMF and IFF, and from 3 to 5 d between M-54×M-55 and CML-242. Lines and single crosses yielded an average of 3.28 and 8.44 Mg ha-1, respectively. Doses of 225 and 300 kg N ha-1 in fertigation delayed IMF and IFF by 1 to 3 d on average, compared to 150 kg N ha-1, which had an average yield of 6.37 Mg ha-1. In 2013 IMF and IFF increased by 4 and 2 d while the yield decreased by 3% compared to 2014. Line M-55 with a dose of 225 kg N ha-1 in 2013 yielded 25% more than with 150 kg N ha-1. Applying 150 kg N ha-1 in fertigation increases seed production and the doses of 225 and 300 kg N ha-1 delay flowering.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Zea mays L.]]></kwd>
<kwd lng="es"><![CDATA[años de producción]]></kwd>
<kwd lng="es"><![CDATA[nutrición]]></kwd>
<kwd lng="es"><![CDATA[rendimiento de semilla]]></kwd>
<kwd lng="es"><![CDATA[sincronía floral]]></kwd>
<kwd lng="en"><![CDATA[Zea mays L.]]></kwd>
<kwd lng="en"><![CDATA[floral synchrony]]></kwd>
<kwd lng="en"><![CDATA[nutrition]]></kwd>
<kwd lng="en"><![CDATA[production years]]></kwd>
<kwd lng="en"><![CDATA[seed yield]]></kwd>
</kwd-group>
</article-meta>
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