<?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>S1659-13212025000100044</article-id>
<article-id pub-id-type="doi">10.15517/am.2025.62524</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Evaluación del nitrato de amonio y flameo para el manejo de arvenses en café]]></article-title>
<article-title xml:lang="en"><![CDATA[Evaluation of ammonium nitrate and flaming for weed management in coffee]]></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[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[Agüero Alvarado]]></surname>
<given-names><![CDATA[Renán]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Soto Aguilar]]></surname>
<given-names><![CDATA[Adolfo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de Costa Rica Estación Experimental Agrícola Fabio Baudrit Moreno ]]></institution>
<addr-line><![CDATA[La Garita Alajuela]]></addr-line>
<country>Costa Rica</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad de Costa Rica Escuela de Estadística ]]></institution>
<addr-line><![CDATA[San Pedro San José]]></addr-line>
<country>Costa Rica</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad de Costa Rica Estación Experimental Agrícola Fabio Baudrit Moreno ]]></institution>
<addr-line><![CDATA[La Garita Alajuela]]></addr-line>
<country>Costa Rica</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Universidad de Costa Rica  ]]></institution>
<addr-line><![CDATA[San Pedro San José]]></addr-line>
<country>Costa Rica</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2025</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2025</year>
</pub-date>
<volume>36</volume>
<numero>1</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S1659-13212025000100044&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S1659-13212025000100044&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S1659-13212025000100044&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Introducción.  Las arvenses compiten con el café por recursos como el agua, la luz y el espacio, por lo que es necesario implementar prácticas de manejo sostenibles. Objetivo. Evaluar la eficacia del manejo de plantas arvenses con nitrato de amonio y flameo en un sistema de café. Materiales y métodos. El estudio se realizó del 26 de septiembre de 2022 al 10 de enero de 2023 en la finca cafetalera La Hilda, en San Pedro de Poás, Alajuela, Costa Rica. Se aplicaron de forma conjunta dos tratamientos alternativos de control de arvenses. El primero consistió en nitrato de amonio diluido en agua en tres dosis (0, 150 y 300 kg/ha), seguido, 15 días después, por la aplicación de flameo también en tres dosis (0, 60 y 120 kg/ha). Las aplicaciones se efectuaron sobre arvenses ubicadas en la entrecalle del café, utilizando un diseño de parcelas divididas; la parcela grande estuvo conformada por las dosis de nitrato de amonio, mientras que las parcelas pequeñas estuvieron conformadas por las dosis de flameo. Se incluyó un tratamiento testigo: control químico con glifosato, también acompañado de flameo. Cada tratamiento se asignó de manera aleatoria y se replicó seis veces. Resultados. Las hojas anchas resultaron moderadamente dañadas a los 25 días después de la aplicación del nitrato y 10 días después del flameo. Ambas dosis de nitrato de amonio sin flameo causaron daños leves en las especies de Commelina diffusa, y la dosis más alta de nitrato de amonio sin flameo provocó daños moderados en hojas anchas. El flameo sin nitrato de amonio ocasionó un daño moderado inicial en hojas angostas. Conclusiones. El efecto herbicida del nitrato de amonio dependió del flameo, pero solamente en hojas anchas. C. diffusa se controló de forma exitosa con glifosato y flameo.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Introduction.  Weeds compete with coffee for water, light, and space; therefore, sustainable management practices must be implemented. Objective. To evaluate the effectiveness of weed management with ammonium nitrate and flaming in a coffee system. Materials and methods. This study was carried out from September 26, 2022, to January 10, 2023, at La Hilda coffee farm in San Pedro de Poás, Alajuela, Costa Rica. Two alternative weed control treatments were applied jointly: the first consisted of ammonium nitrate diluted in water at three doses (0, 150, and 300 kg/ha), followed 15 days later by flaming at three doses (0, 60, and 120 kg/ha). Applications targeted weeds present in the coffee rows, using a split-plot design where the main plot consisted of the ammonium nitrate doses and the small plots corresponded to flaming doses. A chemical control treatment with glyphosate, also combined with flaming, was included. Each treatment was randomly assigned and replicated six times. Results. Broad leaves were moderately damaged 25 days after nitrate application and 10 days after flaming. Both doses of ammonium nitrate without flaming caused slight damage to Commelina diffusa, and the highest ammonium nitrate dose without flaming produced moderate damage to broadleaf weeds; flaming without ammonium nitrate resulted in moderate initial damage to narrowleaf weeds. Conclusions. The herbicidal effect of ammonium nitrate was depended on flaming, but this effect was only observed in broadleaf weeds. C. diffusa was successfully controlled with glyphosate and flaming.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[propano]]></kwd>
<kwd lng="es"><![CDATA[fertilizante foliar]]></kwd>
<kwd lng="es"><![CDATA[herbicidas]]></kwd>
<kwd lng="es"><![CDATA[manejo de malezas]]></kwd>
<kwd lng="es"><![CDATA[Commelina diffusa]]></kwd>
<kwd lng="en"><![CDATA[propane]]></kwd>
<kwd lng="en"><![CDATA[foliar fertilizer]]></kwd>
<kwd lng="en"><![CDATA[herbicides]]></kwd>
<kwd lng="en"><![CDATA[weed management]]></kwd>
<kwd lng="en"><![CDATA[Commelina diffusa]]></kwd>
</kwd-group>
</article-meta>
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