<?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>S0187-73802021000200173</article-id>
<article-id pub-id-type="doi">10.35196/rfm.2021.2.173</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Respuesta de híbridos subtropicales de maíz a la densidad de población]]></article-title>
<article-title xml:lang="en"><![CDATA[Response of subtropical maize hybrids to plant density]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ramírez-Díaz]]></surname>
<given-names><![CDATA[José Luis]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Alemán-de la Torre]]></surname>
<given-names><![CDATA[Ivone]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Bautista-Ramírez]]></surname>
<given-names><![CDATA[Edgardo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vidal-Martínez]]></surname>
<given-names><![CDATA[Víctor A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Salinas-Moreno]]></surname>
<given-names><![CDATA[Yolanda]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ledesma-Miramontes]]></surname>
<given-names><![CDATA[Alejandro]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias Campo Experimental Centro-Altos de Jalisco ]]></institution>
<addr-line><![CDATA[Tepatitlán de Morelos Jalisco]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias Campo Experimental Santiago Ixcuintla ]]></institution>
<addr-line><![CDATA[Santiago Ixcuintla Nayarit]]></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>173</fpage>
<lpage>182</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0187-73802021000200173&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0187-73802021000200173&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0187-73802021000200173&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN En el cultivo de maíz (Zea mays L) la densidad de población es un componente importante de la producción de grano. Esta investigación tuvo como objetivo estudiar la respuesta en rendimiento de grano y características agronómicas de cinco híbridos experimentales de maíz al variar la densidad de población. Los híbridos y dos testigos se sembraron a 65, 75 y 90 mil plantas ha-1 en un diseño experimental de bloques completos al azar con tres repeticiones con arreglo de tratamientos en parcelas divididas, donde la parcela grande incluyó las densidades de población y la chica los híbridos. La unidad experimental fue de cuatro surcos y la parcela útil los dos surcos centrales. La evaluación se hizo en Peña del Panal, Michoacán, México en punta de riego, y en Tepatitlán y San Miguel Cuyutlán, Jalisco, México en temporal. Se registraron datos de planta y de mazorca y se realizaron análisis estadísticos combinados a través de localidades. El rendimiento de los híbridos fue diferente al aumentar la densidad de población, los híbridos HE-48, HE-46, HE-15A y H-377 elevaron el rendimiento al incrementar la densidad de población; el comportamiento del híbrido H-377 fue muy dependiente de la densidad de población, con 65 mil plantas ha-1 tuvo rendimiento de grano bajo y con 90 mil alcanzó su máximo rendimiento. Los híbridos HE-48 y HE-15A tuvieron rendimiento alto tanto en baja como en alta densidad. El rendimiento de grano en función de las densidades de población es un factor importante a considerar para la rentabilidad del cultivo, especialmente en siembras de maíz de temporal, pues en esas condiciones el rendimiento de grano disminuyó al aumentar la densidad de población.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[SUMMARY In maize (Zea mays L.) crop plant density is an important component of grain production. This research aimed to study the response of grain yield and agronomic characteristics of five experimental maize hybrids when varying plant density. The hybrids were planted along with two checks at 65, 75 and 90 thousand plants ha-1 using a randomized complete blocks design with three replications with an split-plot arrangement where the whole plot included plant densities and the split-plot the hybrids. The experimental unit consisted of four rows and the useful plot included the two central rows. The evaluation was carried out at Peña del Panal, Michoacan, Mexico under irrigation, and at Tepatitlán and San Miguel Cuyutlán, Jalisco Mexico under rainfed conditions. Plant and ear data were registered and combined statistical analyses were performed across localities. The yield of hybrids was different as plant density increased. Hybrids HE-48, HE-46, HE-15A and H-377 increased grain yield as the plant density increased; the performance of hybrid H-377 was different when increasing the plant density, at 65 thousand plants ha-1 it had low grain yield and at 90 thousand it reached its maximum yield. Hybrids HE-48 and HE-15A had high performance in both low and high plant density. Grain yield as a function of plant densities is an important factor to consider for the profitability of the crop, especially in rainfed maize plantings, since under those conditions the grain yield decreased as the plant density increased.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Zea mays L.]]></kwd>
<kwd lng="es"><![CDATA[acame]]></kwd>
<kwd lng="es"><![CDATA[densidad óptima]]></kwd>
<kwd lng="es"><![CDATA[potencial genético]]></kwd>
<kwd lng="es"><![CDATA[rendimiento de grano]]></kwd>
<kwd lng="en"><![CDATA[Zea mays L.]]></kwd>
<kwd lng="en"><![CDATA[genetic potential]]></kwd>
<kwd lng="en"><![CDATA[grain yield]]></kwd>
<kwd lng="en"><![CDATA[lodging]]></kwd>
<kwd lng="en"><![CDATA[optimum density]]></kwd>
</kwd-group>
</article-meta>
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