<?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>S1659-13212018000100091</article-id>
<article-id pub-id-type="doi">10.15517/ma.v29i1.28053</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Abundancia y cobertura de arvenses bajo manejo convencional y orgánico de café y banano]]></article-title>
<article-title xml:lang="en"><![CDATA[Weed abundance and ground cover under conventional or organic management of coffee and banana]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Agüero-Alvarado]]></surname>
<given-names><![CDATA[Renán]]></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[González-Lutz]]></surname>
<given-names><![CDATA[María Isabel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Portuguez-García]]></surname>
<given-names><![CDATA[Pamela]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Brenes-Prendas]]></surname>
<given-names><![CDATA[Steven]]></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>
<aff id="Af5">
<institution><![CDATA[,Universidad Escuela de Agricultura de la Región Tropical Húmeda (EARTH)  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Costa Rica</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>04</month>
<year>2018</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>04</month>
<year>2018</year>
</pub-date>
<volume>29</volume>
<numero>1</numero>
<fpage>91</fpage>
<lpage>100</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S1659-13212018000100091&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S1659-13212018000100091&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S1659-13212018000100091&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Ciertas especies de la vegetación espontánea pueden ser utilizadas como cobertura en cultivos como banano y café. El objetivo de este estudio fue comparar la cobertura y la abundancia de arvenses en los sistemas productivos orgánico y convencional de banano y café. Los muestreos de la vegetación se realizaron entre los años 2015 y 2016 en fincas seleccionadas de las provincias de Limón y Alajuela, Costa Rica. Se usó la metodología de área mínima para determinar el tamaño de los sitios muestrales. En cada sitio se identificaron todas las especies de arvenses presentes y se agruparon por familia. También se determinó la cobertura porcentual de cada especie, por medio de una escala visual. En ambos cultivos, la diversidad de arvenses fue mayor cuando se usó control químico con glifosato, mientras que la cobertura máxima de cada especie tendió a mantenerse al mínimo de la escala de evaluación, cuando se asperjó ese herbicida. Bajo el manejo orgánico con chapias, se estableció una jerarquía competitiva de especies dominantes, que no permitió el establecimiento de otras menos adaptadas al sitio; en contraste, el uso de herbicidas, si redujo significativamente las poblaciones de arvenses, dejó abiertos abundantes espacios para que un mayor número de especies se regeneren a partir del banco de propágulos. El manejo orgánico en ambos cultivos mostró mayor cobertura de arvenses en el suelo, pero en menor cantidad de especies. En contraste, el manejo químico con glifosato mostró un mayor número de especies, pero una significativa reducción en la cobertura del suelo por arvenses.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Certain weeds can be used as cover species in bananas and coffee plantations. The objective of this study was to compare ground cover and abundance of weed species, between the organic and conventional production systems of banana and coffee. Selected farms under organic or conventional management located at Limón and Alajuela were surveyed for weeds, during 2015 and 2016. The minimum area methodology was used to determine sampling site size. At each sampling site, all weed species were identified and grouped into their respective taxonomic families. Percent soil cover by each species was also estimated by means of a visual scale. In both crops, weed diversity was higher when the herbicide glyphosate was used for weed control, although the ground cover for these species was kept at a minimum. These results are thought to arise from the fact that under the organic production system, a hierarchy of dominant species is established, which in turn inhibit many of the somewhat less adapted species, whereas under the conventional production system, the use of a non-residual herbicide renders the ground with plenty of space for species regeneration from the soil propagule bank. Organic weed management in both crops showed higher soil cover by weeds, but from a lower number of species. In contrast, chemical weed management with glyphosate showed a higher number at species, but a significant reduction in ground cover by those weeds.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[cultivos perennes]]></kwd>
<kwd lng="es"><![CDATA[coberturas naturales]]></kwd>
<kwd lng="es"><![CDATA[manejo de arvenses]]></kwd>
<kwd lng="es"><![CDATA[glifosato]]></kwd>
<kwd lng="es"><![CDATA[cobertura máxima]]></kwd>
<kwd lng="en"><![CDATA[perennial crops]]></kwd>
<kwd lng="en"><![CDATA[natural covers]]></kwd>
<kwd lng="en"><![CDATA[weed management]]></kwd>
<kwd lng="en"><![CDATA[glyphosate]]></kwd>
<kwd lng="en"><![CDATA[maximum ground cover]]></kwd>
</kwd-group>
</article-meta>
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