<?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>1659-1321</journal-id>
<journal-title><![CDATA[Agronomía Mesoamericana]]></journal-title>
<abbrev-journal-title><![CDATA[Agron. Mesoam]]></abbrev-journal-title>
<issn>1659-1321</issn>
<publisher>
<publisher-name><![CDATA[Universidad de Costa Rica]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1659-13212020000300768</article-id>
<article-id pub-id-type="doi">10.15517/am.v31i3.37775</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Influencia de la sombra y la escarificación sobre la germinación de Ischaemum rugosum Salisb.]]></article-title>
<article-title xml:lang="en"><![CDATA[Influence of shade and scarification on the germination of Ischaemum rugosum Salisb.]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Portuguez-García]]></surname>
<given-names><![CDATA[Mary Pamela]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rodríguez-Ruiz]]></surname>
<given-names><![CDATA[Ana María]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Herrera-Murillo]]></surname>
<given-names><![CDATA[Franklin]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[González-Lutz]]></surname>
<given-names><![CDATA[María Isabel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de Costa Rica  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Costa Rica</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad de Costa Rica  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Costa Rica</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad de Costa Rica  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Costa Rica</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Universidad de Costa Rica  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Costa Rica</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2020</year>
</pub-date>
<volume>31</volume>
<numero>3</numero>
<fpage>768</fpage>
<lpage>779</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S1659-13212020000300768&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S1659-13212020000300768&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S1659-13212020000300768&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Introducción. El porcentaje de sombra y la escarificación pueden influir en la germinación de la maleza Ischaemum rugosum Salisb. El conocimiento de estos aspectos permitiría establecer medidas exitosas para un manejo integrado de esta especie. Objetivo. Comparar la influencia de diferentes porcentajes de sombra sobre la germinación de I. rugosum Salisb. escarificadas y no escarificadas. Materiales y métodos. El experimento se realizó en micro túneles en la época seca y en la de transición a lluviosa, en la Estación Experimental Agrícola Fabio Baudrit Moreno, Alajuela, Costa Rica, durante el 2016. En la época seca, se utilizaron los porcentajes de sombra: 0 %, 30 %, 50 %, 70 % (sarán verde) y 100 % (sarán negro). En la transición a lluviosa, se utilizaron los mismos porcentajes, pero se cambió el sarán negro por sarán blanco 70 %; en ambos experimentos se emplearon semillas escarificadas y no escarificadas de la maleza y se contabilizó la germinación. Los datos se analizaron con regresión logística y una prueba de hipótesis para los coeficientes de regresión con un nivel de significancia del 5 %. Resultados. En la época seca hubo mayor germinación con semillas no escarificadas y 50 % de sombra. Durante la transición a época lluviosa la máxima germinación ocurrió a los cuatro días después de siembra (dds), bajo 50 % de sombra y con semilla escarificada, y a los quince días después de siembra la germinación más alta (razón de ventaja 8,67 a 1) ocurrió con 70 % de sombra, sarán verde y semilla escarificada. Conclusión. La escarificación permitió un aumento de la germinación en la época transición a lluviosa, no ocurrió así en la época seca. En ambas épocas hubo influencia positiva en la germinación con los porcentajes de sombra de 50 % y 70 %.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Introduction. The percentage of shade and scarification can influence the germination of Ischaemun rugosum Salisb. Knowledge of these aspects would allow establishment of successful measures for an integrated management of this species. Objective. To compare the influence of different percentages of shade on the germination of scarified and not scarified I. rugosum Salisb. Materials and methods. This experiment was carried out in micro-tunnels during the dry season and the transition to the rainy season, at Fabio Baudrit Moreno Agricultural Experimental Station, Alajuela, Costa Rica, during 2016. In the dry season, the following shade percentages were used 0 %, 30 %, 50 % (green saran), and 100 % (black saran). In the transition to the rainy season, the same percentages of shade were used, but the black saran was changed to 70 % white saran, in both experiments scarified and non-scarified seeds of the weed were used and germination was counted. The data were analyzed with logistic regression and a hypothesis test for the regression coefficients with a significance level of 5 %. Results. In the dry season there was greater germination with non-scarified seeds and 50 % shade. During the transition to the rainy season the highest germination occurred at four days after sowing (dds), under 50 % shade and with scarified seed, and fifteen days after sowing the highest germination (odds ratio 8.67 to 1) occurred with 70 % shade, green saran and scarified seed. Conclusion. Scarification allowed an increase in germination in the transition to the rainy season, not in the dry season. In both seasons there was a positive influence on germination with the shade percentages of 50 % and 70 %.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[dormancia de semillas]]></kwd>
<kwd lng="es"><![CDATA[biología de las malezas]]></kwd>
<kwd lng="es"><![CDATA[radiación solar]]></kwd>
<kwd lng="es"><![CDATA[sarán]]></kwd>
<kwd lng="en"><![CDATA[seed dormancy]]></kwd>
<kwd lng="en"><![CDATA[weed biology]]></kwd>
<kwd lng="en"><![CDATA[solar radiation]]></kwd>
<kwd lng="en"><![CDATA[saran]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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