<?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>0187-5779</journal-id>
<journal-title><![CDATA[Terra Latinoamericana]]></journal-title>
<abbrev-journal-title><![CDATA[Terra Latinoam]]></abbrev-journal-title>
<issn>0187-5779</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Mexicana de la Ciencia del Suelo A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0187-57792020000400507</article-id>
<article-id pub-id-type="doi">10.28940/terra.v38i3.557</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Grain yield and population densities of new corn hybrids released by the INIFAP and UNAM for the High Valleys of Mexico]]></article-title>
<article-title xml:lang="es"><![CDATA[Rendimiento de grano y densidades de población de nuevos híbridos de maíz liberados por el INIFAP y UNAM para los Valles Altos de México]]></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[Espinosa-Calderón]]></surname>
<given-names><![CDATA[Alejandro]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Canales-Islas]]></surname>
<given-names><![CDATA[Enrique]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[López-López]]></surname>
<given-names><![CDATA[Consuelo]]></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[Turrent-Fernández]]></surname>
<given-names><![CDATA[Antonio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gómez-Montiel]]></surname>
<given-names><![CDATA[Noel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sierra-Macías]]></surname>
<given-names><![CDATA[Mauro]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Martínez-Gutiérrez]]></surname>
<given-names><![CDATA[Aarón]]></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 contrib-type="author">
<name>
<surname><![CDATA[Andrés-Meza]]></surname>
<given-names><![CDATA[Pablo]]></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 Cuautitlán ]]></institution>
<addr-line><![CDATA[Cuautitlán Izcalli Estado de México]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,INIFAP Campo Experimental Valle de México ]]></institution>
<addr-line><![CDATA[Texcoco Estado de México]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,INIFAP Campo Experimental Iguala ]]></institution>
<addr-line><![CDATA[Iguala de la Independencia Guerrero]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,INIFAP Campo Experimental Cotaxtla ]]></institution>
<addr-line><![CDATA[Veracruz Veracruz]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af5">
<institution><![CDATA[,Universidad Autónoma Nayarit  ]]></institution>
<addr-line><![CDATA[Tepic Nayarit]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af6">
<institution><![CDATA[,Universidad Veracruzana Facultad de Ciencias Biológicas y Agropecuarias ]]></institution>
<addr-line><![CDATA[Córdoba Veracruz]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>09</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>09</month>
<year>2020</year>
</pub-date>
<volume>38</volume>
<numero>3</numero>
<fpage>507</fpage>
<lpage>515</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0187-57792020000400507&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0187-57792020000400507&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0187-57792020000400507&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Summary: In Mexico, corn (Zea mays L.) is one of the most important cereals from the alimentary, industrial, social, political, and cultural points of view. It is grown in different agroecological niches, water regimes, and management systems. The objective of the present research work was to study the optimum plant density per area unit and its effect on grain yield and agronomical characteristics of different corn hybrids. Six corn hybrids (H-51 AE, H 53 AE, H 47 AE, H 49 AE, Tsíri PUMA, and H-48) and three plant densities (50 000, 65 000, and 80 000 plants ha-1) were evaluated. Sowing was done during the spring-summer season, 2015, in field owned by the FESC-UNAM and CEVAMEX-INIFAP. A completely randomized block design was used with four replicates. Significant differences (P &#8804; 0.05) were detected for genotypes (G) in the variables of grain yield, plant height, ear height, days to male and female flowering, volumetric weight, grain weight, ear length, and grains per ear. Moreover, the effect of the environment (E) was significant (P &#8804; 0.05) for the same variables, with the exception of ear length. No significant differences (P &#8805; 0.05) were registered for the densities factor (D). Only the G×E interaction had significant differences (P &#8804; 0.05) in the grain yield trait. The better environment was CEVAMEX, with a mean yield of 5497 kg ha-1. The Tsíri PUMA hybrid had the best grain yield with 5856 kg ha-1. Although there were no differences for the studied interactions, the 65 000 plants ha-1 population density was the most appropriate. The densities factor did not affect the performance of the evaluated hybrids. Therefore, we recommend using 65 000 plants ha-1 to avoid investing in large amounts of seeds.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: En México, el maíz (Zea mays L.) es uno de los cereales más importantes desde el punto de vista alimenticio, industrial, social, político y cultural. Su siembra se realiza bajo diferentes nichos agroecológicos, regímenes de humedad y sistemas de manejo. El objetivo del presente trabajo de investigación fue estudiar la óptima densidad de planta por unidad de superficie y su efecto sobre el rendimiento de grano y características agronómicas de diferentes híbridos de maíz. Se evaluaron seis híbridos de maíz (H-51 AE, H-53 AE, H-47 AE, H-49 AE, Tsíri PUMA y H-48) y tres densidades de planta (50 000, 65 000 y 80 000 plantas ha-1). La siembra se realizó durante el ciclo primavera verano 2015, en terrenos de la FESC-UNAM y CEVAMEX-INIFAP. Se utilizó un diseño de bloques completamente al azar con cuatro repeticiones. Se detectaron diferencias significativas (P &#8804; 0.05) para genotipos (G) en las variables rendimiento de grano, altura de la planta, altura de la mazorca, días a floración masculina y femenina, peso volumétrico, peso de grano, longitud de mazorca y granos por mazorca. Asimismo, el efecto del ambiente (A) fue significativo (P &#8804; 0.05) para estas mismas variables, excepto para longitud de mazorca. No se registraron diferencias significativas (P &#8805; 0.05) para el factor densidades. Solo la interacción G×A, detectó diferencias significativas (P &#8804; 0.05) en la variable rendimiento de grano. El mejor ambiente fue CEVAMEX, con un rendimiento promedio de 5497 kg ha-1. El híbrido Tsíri PUMA, obtuvo el mayor rendimiento de grano con 5856 kg ha&#8209;1. Aunque no se encontraron diferencias para las interacciones estudiadas, la densidad de población con 65 000 plantas ha&#8209;1 fue el más apropiado. El factor densidades no afectó el desempeño de los híbridos evaluados. Por lo tanto, se recomienda usar 65 000 plantas ha-1, para evitar que el agricultor invierta en la compra de grandes cantidades de semillas.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[hybrids]]></kwd>
<kwd lng="en"><![CDATA[male sterility]]></kwd>
<kwd lng="en"><![CDATA[population densities]]></kwd>
<kwd lng="en"><![CDATA[Zea mays L]]></kwd>
<kwd lng="es"><![CDATA[híbridos]]></kwd>
<kwd lng="es"><![CDATA[androesterilidad]]></kwd>
<kwd lng="es"><![CDATA[densidades de población]]></kwd>
<kwd lng="es"><![CDATA[Zea mays L]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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