<?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>0120-2812</journal-id>
<journal-title><![CDATA[Acta Agronómica]]></journal-title>
<abbrev-journal-title><![CDATA[Acta Agron.]]></abbrev-journal-title>
<issn>0120-2812</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional de Colombia]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0120-28122023000200156</article-id>
<article-id pub-id-type="doi">10.15446/acag.v72n2.107536</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Dry matter production and chlorophyll content index in mixed pastures of the Venezuelan humid tropics]]></article-title>
<article-title xml:lang="es"><![CDATA[Producción de materia seca e índice de contenido de clorofila en pasturas mixtas del trópico húmedo venezolano]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rangel Marquina]]></surname>
<given-names><![CDATA[Sairo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Piña]]></surname>
<given-names><![CDATA[Andrés]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Uzcátegui-Varela]]></surname>
<given-names><![CDATA[Juan Pablo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Castillo]]></surname>
<given-names><![CDATA[Daniel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Briceño-Rangel]]></surname>
<given-names><![CDATA[Armando]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Chompre]]></surname>
<given-names><![CDATA[Kendry]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional Experimental Sur del Lago &#8220;Jesús María Semprum&#8221; (UNESUR) Núcleo La Victoria ]]></institution>
<addr-line><![CDATA[Mérida ]]></addr-line>
<country>Venezuela</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad de Los Andes  ]]></institution>
<addr-line><![CDATA[Mérida ]]></addr-line>
<country>Venezuela</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2023</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2023</year>
</pub-date>
<volume>72</volume>
<numero>2</numero>
<fpage>156</fpage>
<lpage>160</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0120-28122023000200156&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0120-28122023000200156&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0120-28122023000200156&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract An ecophysiological study was carried out in a mixed pasture composed mainly of grasses Megathyrsus maximus and Brachiaria arrecta in the South of Lake Maracaibo, Venezuela, under tropical rainforest conditions, with the purpose of determining the possible beneficial association between these tropical grasses. Seven paddocks were sampled, taking three subsamples of each, both in the dry and wet season; the technique consisted of throwing a random metal frame in a zigzag shape. The chlorophyll content index (CCI) and the foliar and root dry weight were measured. Data were analyzed using the Mann-Whitney U nonparametric statistical test. No differences were found for the root dry weight variable between the two seasons for the two species. Regarding the leaf dry weight, B. arrecta did not show differences between the seasons, while for M. maximus, it was higher in the wet season. The CCI in B. arrecta did not show differences between the seasons, while in M. maximus, it was higher in the wet season. According to the results, it was concluded that this association is beneficial because M. maximus favors B. arrecta possibly due to a nurse effect, which allows this species to have less abiotic stress and therefore greater carbon fixation and greater availability of plant biomass during the most critical season, namely the dry season.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Se realizó un estudio ecofisiológico en una pastura mixta compuesta principalmente por los pastos Megathyrsus maximus y Brachiaria arrecta en el Sur del Lago de Maracaibo, Venezuela, bajo condiciones de selva húmeda tropical, con el propósito de determinar la posible asociación benéfica entre estos pastos tropicales. Se muestrearon siete potreros, tomando tres submuestras en cada uno, tanto en la temporada seca como en la húmeda; la técnica consistió en arrojar un marco de metal al azar en forma de zigzag. Se midieron el índice de contenido de clorofila (ICC) y el peso seco foliar y de raíz. Los datos se analizaron con la prueba estadística no paramétrica U de Mann- Whitney. No se encontraron diferencias para la variable peso seco de raíz entre las dos épocas para las dos especies. En cuanto al peso seco foliar, B. arrecta no mostró diferencias entre las épocas, mientras que para M. maximus, fue mayor en la época húmeda. El ICC en B. arrecta no presentó diferencias entre las estaciones, mientras que en M. maximus, fue más alto en la época húmeda. Con base en los resultados, se concluyó que esta asociación es beneficiosa porque M. maximus favorece a B. arrecta posiblemente por un efecto nodriza que le permite a esta especie tener menos estrés abiótico y por lo tanto mayor fijación de carbono y así mayor disponibilidad de biomasa vegetal en la época más crítica como lo es la seca.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Brachiaria arrecta]]></kwd>
<kwd lng="en"><![CDATA[chlorophyll meter]]></kwd>
<kwd lng="en"><![CDATA[Megathyrsus maximus]]></kwd>
<kwd lng="en"><![CDATA[mixed pasture]]></kwd>
<kwd lng="es"><![CDATA[Bracharia arrecta]]></kwd>
<kwd lng="es"><![CDATA[medidor de clorofila]]></kwd>
<kwd lng="es"><![CDATA[Megathyrsus maximus]]></kwd>
<kwd lng="es"><![CDATA[pastura mixta]]></kwd>
</kwd-group>
</article-meta>
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