<?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>S0120-28122018000400512</article-id>
<article-id pub-id-type="doi">10.15446/acag.v67n4.69985</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Periods of interference by Cyperus esculentus L. in Pennisetum purpureum Schum]]></article-title>
<article-title xml:lang="es"><![CDATA[Períodos de interferencia de Cyperus esculentus L. en Pennisetum purpureum Schum]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Brighenti]]></surname>
<given-names><![CDATA[Alexandre Magno]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Oliveira]]></surname>
<given-names><![CDATA[Maurílio Fernandes]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Embrapa Gado de Leite ]]></institution>
<addr-line><![CDATA[MG Juiz de Fora]]></addr-line>
<country>Brazil</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Embrapa Milho e Sorgo ]]></institution>
<addr-line><![CDATA[ MG]]></addr-line>
<country>Brazil</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2018</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2018</year>
</pub-date>
<volume>67</volume>
<numero>4</numero>
<fpage>512</fpage>
<lpage>516</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0120-28122018000400512&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0120-28122018000400512&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0120-28122018000400512&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Interference from weeds directly affects the productivity and the quality of elephant grass (Pennisetum purpureum) fodder. The difficulty in controlling weed species is one of the primary limitations to the production and use of elephant grass as forage in dairy farming and for biomass production in energy generation. The objective of this study was to determine the different periods in which yellow nutsedge (Cyperus esculentus) interfered with elephant grass forage yield. Two field experiments were conducted using a randomized complete block design with four replicates in Valenga, Rio de Janeiro State, Brazil. Elephant grass and weeds were maintained together for increasing periods of time: 0, 14, 28, 42, 56 and 70 days after planting (DAP) (experiment 1). The plants were kept free of competition with weekly hand hoeing after each period. The elephant grass crop used in experiment 2 was kept free of weeds for the same periods of time. The weeds that emerged after these intervals were not controlled further to the end of the experiment. The elephant grass coexisted with C. esculentus up to 23 days after planting with no loss in yield, which corresponded to the period before interference. The total period of preventing interference was 42 DAP, and the critical period of preventing interference extended from 23 to 42 days after planting. (DAP).]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen La interferencia de las malezas afecta directamente la productividad y la calidad del forraje de pasto elefante (Pennisetumpurpureum). La dificultad para controlar las especies de malezas es una de las principales limitaciones para la producción y uso de pasto elefante como forraje en la producción lechera y para la producción de biomasa en la generación de energía. El objetivo de este estudio fue determinar los diferentes periodos en los que la chufa (Cyperus esculentus) interfirió con el rendimiento de forraje de pasto de elefante. Se realizaron dos experimentos de campo utilizando un diseño de bloques completos al azar con cuatro repeticiones en Valenga, Estado de Río de Janeiro, Brasil. La hierba de elefante y las malas hierbas se mantuvieron juntas durante períodos de tiempo crecientes: 0, 14, 28, 42, 56 y 70 días después de la siembra (DDS) (experimento 1). Las plantas de P. purpureum se mantuvieron libres de competencia con azada manual semanal después de cada período. El cultivo de pasto elefante usado en el experimento 2 se mantuvo libre de malas hierbas durante los mismos periodos de tiempo. Las malas hierbas que surgieron después de estos intervalos no fueron controladas hasta el final del experimento. El pasto elefante coexistió con C. esculentus hasta 23 días después de la siembra, sin pérdida de rendimiento, que correspondía al período anterior a la interferencia. El período total de prevención de la interferencia fue 42 DDS, y el período crítico de prevención de la interferencia se extendió de 23 a 42 días después de la siembra.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Cyperus esculentus]]></kwd>
<kwd lng="en"><![CDATA[elephant grass]]></kwd>
<kwd lng="en"><![CDATA[forage]]></kwd>
<kwd lng="en"><![CDATA[Napier grass]]></kwd>
<kwd lng="en"><![CDATA[Pennisetum purpureum]]></kwd>
<kwd lng="en"><![CDATA[yellow nutsedge]]></kwd>
<kwd lng="en"><![CDATA[weeds]]></kwd>
<kwd lng="es"><![CDATA[Cyperus esculentus]]></kwd>
<kwd lng="es"><![CDATA[forrajes]]></kwd>
<kwd lng="es"><![CDATA[malas hierbas, pasto elefante, Pennisetum purpureum]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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