<?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>0120-9965</journal-id>
<journal-title><![CDATA[Agronomía Colombiana]]></journal-title>
<abbrev-journal-title><![CDATA[Agron. colomb.]]></abbrev-journal-title>
<issn>0120-9965</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional de Colombia, Facultad de Agronomía]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0120-99652020000200280</article-id>
<article-id pub-id-type="doi">10.15446/agron.colomb.v38n2.82196</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Effect of the use of pre- and post-emergence herbicides on nodulation and production of cowpea (Vigna unguiculata L.) in the Amazonian savannah]]></article-title>
<article-title xml:lang="es"><![CDATA[Efecto del uso de herbicidas pre- y post-emergentes en la nodulación y productividad del frijol caupí (Vigna unguiculata L.) en la sabana amazónica]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cruz]]></surname>
<given-names><![CDATA[Anna Bárbara de Souza]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Albuquerque]]></surname>
<given-names><![CDATA[José de Anchieta Alves de]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rocha]]></surname>
<given-names><![CDATA[Paulo Roberto Ribeiro]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Souza]]></surname>
<given-names><![CDATA[Leandro Torres de]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cruz]]></surname>
<given-names><![CDATA[Diego Lima de Souza]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Soares]]></surname>
<given-names><![CDATA[Maria Beatriz Bernardes]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Castro]]></surname>
<given-names><![CDATA[Thaís Santiago]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Santos]]></surname>
<given-names><![CDATA[Thatyele Sousa dos]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Silva]]></surname>
<given-names><![CDATA[Edgley Soares da]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Federal University of Roraima  ]]></institution>
<addr-line><![CDATA[Boa Vista Roraima]]></addr-line>
<country>Brazil</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Institute of Education Science and Technology of Amazonas  ]]></institution>
<addr-line><![CDATA[Manaus Amazonas]]></addr-line>
<country>Brazil</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Agribusiness Technology Agency of São Paulo  ]]></institution>
<addr-line><![CDATA[Pindorama São Paulo]]></addr-line>
<country>Brazil</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2020</year>
</pub-date>
<volume>38</volume>
<numero>2</numero>
<fpage>280</fpage>
<lpage>286</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0120-99652020000200280&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0120-99652020000200280&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0120-99652020000200280&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract As a control measure against weeds, the use of herbicides is an effective and inexpensive alternative. However, there are no products recommended for the cultivation of cowpea in Brazil, making it necessary to search for alternative solutions. The objective of this study was to evaluate the effect of herbicides applied in the pre- and post-emergence on cowpea nodulation and production under conditions of the Amazonian savannah. Two experiments were carried out in a randomized block design with four replicates, using the cowpea cultivar BRS Aracê subjected to the pre-emergence herbicides: Metribuzin, Sulfentrazone, S-metolachlor, Pendimethalin, Oxadiazon, Alachlor, Metribuzin + Pendimethalin, Metribuzin + Alachlor and Quizalofop-p-ethyl, Bentazon, Fomesafen, Imazethapyr, Imazamox + Bentazon, Quizalofop-p-ethyl + Imazethapyr, Quizalofop-p-ethyl + Ima-zamox and Quizalofop-p-ethyl + Bentazon, and post-emergence herbicides: Quizalofop-p-ethyl, Bentazon, Fomesafen, Imazetha-pyr, Imazamox + Bentazon, Quizalofop-p-ethyl + Imazethapyr, Quizalofop-p-ethyl + Imazamox, and Quizalofop-p-ethyl + Bentazon. The number of nodules in each plant, the dry matter of nodules, dry matter of roots and the grain yield were evaluated. According to the results obtained, the management of weeds in pre- or post-emergence according to the herbicide used affects the nodulation and productivity of cowpea under the conditions of the Amazonian savannah. The herbicides Metribuzin in pre-emergence, and Fomesafen and the mixture of Quizalofop-p-ethyl + Imazethapyr in post-emergence are not recommended for weed control in cowpea. The application of Oxadiazon, Alachlor, and Pendimethalin in pre-emergence can be considered interesting because they do not inhibit the development of the root system or the nodulation of cowpea which provides a greater grain yield. Regarding weed control strategies at post-emergence, the application of the herbicide Imazethapyr and the combination of the herbicides quizalofop-p-ethyl + imazamox, Quizalofop-p-ethyl + Bentazon and Imazamox + Bentazon allow satisfactory levels of grain yield, root system development and nodulation of cowpea.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Como medida de control contra las malezas, el uso de herbicidas es una alternativa efectiva y asequible. Sin embargo, no hay productos recomendados para el cultivo de frijol caupí en Brasil, por lo que es necesario buscar soluciones alternativas. El objetivo de este estudio fue evaluar el efecto de herbicidas aplicados en pre- y post-emergencia sobre la nodulación y productividad del frijol caupí bajo las condiciones de la sabana amazónica. Se realizaron dos experimentos en bloques al azar con cuatro repeticiones, utilizando el cultivar de frijol caupí BRS Aracê sometido a los herbicidas pre-emergentes: Metribuzina, Sulfentrazona, S-metolaclor, Pendimetalina, Oxadiazón, Alaclor, Metribuzina + Pendimetalina, Metribuzina + Alaclor y Quizalofop-p-etil, Bentazona, Fomesafen, Imazetapir, Imazamox + Bentazona, Quizalofop-p-etil + Imazetapir, Quizalofop-p-etil + Imazamox y Quizalofop-p-etil + Bentazona, y herbicidas post-emergentes: Quizalofop-p-etil, Bentazona, Fomesafen, Imazetapir, Imazamox + Bentazona, Quizalofop-p-etil + Imazetapir, Quizalofop-p-etil + Imazamox, Quizalofop-p-etil + Bentazona. Se evaluaron el número de nódulos por planta, la masa seca de nódulos, la masa seca de raíces y el rendimiento de grano. Según los resultados obtenidos en este estudio, el manejo de malezas en pre o post-emer-gencia de acuerdo con el herbicida utilizado afecta la nodulación y el rendimiento de grano de frijol caupí bajo condiciones de la sabana amazónica. Los herbicidas Metribuzina en pre-emergen-cia, y Fomesafen y la mezcla de Quizalofop-p-etil + Imazetapir en post-emergencia no se recomiendan para el control de malezas en frijol caupí. La aplicación de Oxadiazón, Alaclor y Pendimetalina en la pre-emergencia puede considerarse interesante porque no inhiben el desarrollo del sistema radicular o la nodulación de frijol caupí lo que proporciona un mayor rendimiento de grano. En lo relacionado con las estrategias de control de malezas posteriores a la emergencia, la aplicación del herbicida Imazetapir y la combinación de los herbicidas Quizalofop-p-etil + Imazamox, Quizalofop-p-etil + Bentazona e Imazamox + Bentazona permiten niveles satisfactorios de rendimiento de grano, desarrollo del sistema de raíces y nodulación de frijol caupí.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[chemical control]]></kwd>
<kwd lng="en"><![CDATA[nitrogen fixation]]></kwd>
<kwd lng="en"><![CDATA[weeds]]></kwd>
<kwd lng="es"><![CDATA[control químico]]></kwd>
<kwd lng="es"><![CDATA[fijación de nitrógeno]]></kwd>
<kwd lng="es"><![CDATA[malezas]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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