<?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>1405-3195</journal-id>
<journal-title><![CDATA[Agrociencia]]></journal-title>
<abbrev-journal-title><![CDATA[Agrociencia]]></abbrev-journal-title>
<issn>1405-3195</issn>
<publisher>
<publisher-name><![CDATA[Colegio de Postgraduados]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1405-31952016000100033</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Productividad de la generación F 1 y F 2 de híbridos de maíz (Zea Mays L.) de valles altos de México]]></article-title>
<article-title xml:lang="en"><![CDATA[Productivity of F 1 and F 2 maize (Zea mays L.) Hybrids in the highland of Mexico]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Tadeo-Robledo]]></surname>
<given-names><![CDATA[Margarita]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Zaragoza-Esparza]]></surname>
<given-names><![CDATA[Job]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Espinosa-Calderón]]></surname>
<given-names><![CDATA[Alejandro]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Turrent-Fernández]]></surname>
<given-names><![CDATA[Antonio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Zamudio-González]]></surname>
<given-names><![CDATA[Benjamín]]></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[Mora-García]]></surname>
<given-names><![CDATA[K. Yazmine]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Valdivia-Bernal]]></surname>
<given-names><![CDATA[Roberto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional Autónoma de México Facultad de Estudios Superiores Cuautitlan ]]></institution>
<addr-line><![CDATA[Cuautitlán Izcalli Estado 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[Texcoco Estado de México]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Autónoma Nayarit  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>02</month>
<year>2016</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>02</month>
<year>2016</year>
</pub-date>
<volume>50</volume>
<numero>1</numero>
<fpage>33</fpage>
<lpage>41</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-31952016000100033&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-31952016000100033&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-31952016000100033&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen En México se siembran 8.5 millones ha de maíz (Zea mays L.) cada año, en 25 % de esta superficie se emplea semilla mejorada; y semillas nativas (50 % de maíces nativos genuinos y 25 % variedades mejoradas acriolladas o generaciones avanzadas de híbridos) en el resto. La semilla mejorada se concentra en áreas de potencial productivo alto, cada año hay resistencia a la adquisición de semilla nueva, por su costo elevado. Para verificar el rendimiento de las generaciones F1 y F2, se evaluaron los híbridos H-40, H-51 AE, H-57 AE y Puma 1167, en el ciclo primavera-verano de 2013, en la Facultad de Estudios Superiores Cuautitlán, UNAM. El diseño experimental fue bloques completos al azar con cuatro repeticiones, el análisis estadístico se efectuó en forma factorial y los factores fueron: híbridos (4), densidades de población (2), generación F1 y F2(2), así como las interacciones híbridos x F1 F2, híbridos x DP, F1 F2 x DP, híbridos x F1 F2 x DP. El análisis de varianza detectó diferencias altamente significativas para rendimiento entre híbridos, generaciones F1 y F2 y diferencias significativas entre densidades de población, y ninguna de las interacciones fue significativa. El CV fue 12.0 % y el valor promedio 8422 kg ha-1. La generación F1 en promedio rindió 9040 kg ha-1 y la generación F2 7804 kg ha-1. Los híbridos con rendimiento mayor fueron Puma 1167 (9989 kg ha-1) y H-57 AE (8334 kg ha-1). Con la densidad de población de 70 000 plantas-1 ha-1(8765 kg ha-1) se obtuvo rendimiento mayor que con 55 000 plantas ha-1. Los resultados confirmaron que no conviene el uso de semilla de generación F2, por el decremento en su productividad.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract In Mexico 8.5 million ha of maize (Zea mays L.) are sown each year. Hybrid seed is used in about 25 % of this area, and in the rest, local varieties (50 % genuine maize landraces and 25 % locally adapted, improved varieties or advanced generations of hybrids). The hybrid seed use is concentrated in areas of high productive potential. Each year there is reluctance to acquire new seed due to its high cost. To verify the yield of F1 and F2 hybrids, an evaluation was made of varieties H-40, H-51 AE, H-57 AE and Puma 1167 in the spring -summer cycle of 2013 by the Cuautitlán Graduate Studies Department of UNAM. The experimental design was complete randomized blocks with four replicates. The statistical analysis was carried out in a factorial design with the following factors: hybrids (4), population densities (2), generation F1 and F2 (2), as well as the hybrid interactions x F1 F2, hybrids x PD, F1 F2 x PD, hybrids x F1 F2 x PD. The analysis of variance detected highly significant differences for yield among hybrids and generations F1 and F2, and significant differences among population densities; none of the interactions was significant. The CV was 12.0 % and the average value was 8422 kg ha-1. The F1 generation yielded an average of 9040 kg ha-1, and the F2 , 7804 kg ha-1. The hybrids with the highest yields were Puma 1167 (9989 kg ha-1) and H-57 AE (8334 kg ha-1). Compared to a population density of 70 000 plants ha-1 (8765 kg ha-1), a higher yield was obtained than with 55 000 plants ha-1. The results confirm that the use of the F2 generation of seed is not desirable, due to the decrease in productivity.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Zea mays L.]]></kwd>
<kwd lng="es"><![CDATA[semilla mejorada]]></kwd>
<kwd lng="es"><![CDATA[rendimiento ge neración F1 y F2]]></kwd>
<kwd lng="en"><![CDATA[Zea mays L.]]></kwd>
<kwd lng="en"><![CDATA[improved seed]]></kwd>
<kwd lng="en"><![CDATA[yield of F1 and F2 hybrids]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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