<?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>S0120-99652021000300392</article-id>
<article-id pub-id-type="doi">10.15446/agron.colomb.v39n3.96334</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Weed control and selectivity of different pre-emergence active ingredients in a soybean crop]]></article-title>
<article-title xml:lang="es"><![CDATA[Control de malezas y selectividad de diferentes principios activos preemergentes en un cultivo de soya]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[de Sousa da Silva]]></surname>
<given-names><![CDATA[Marcelo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Lima Furtado]]></surname>
<given-names><![CDATA[José Augusto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Quadros Castro]]></surname>
<given-names><![CDATA[Janine]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Leite dos Santos]]></surname>
<given-names><![CDATA[lasmim]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Almeida]]></surname>
<given-names><![CDATA[Edmilson Igor Bernardo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Taverny de Oliveira]]></surname>
<given-names><![CDATA[Leonardo Bernardes]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[da Silva Sousa]]></surname>
<given-names><![CDATA[Washington]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[de Albuquerque Araújo]]></surname>
<given-names><![CDATA[Rodolfo César]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,University of Maranhão  ]]></institution>
<addr-line><![CDATA[Maranhão ]]></addr-line>
<country>Brazil</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Federal University of Grande Dourados Department of Vegetable Production ]]></institution>
<addr-line><![CDATA[ Mato Grosso do Sul]]></addr-line>
<country>Brazil</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2021</year>
</pub-date>
<volume>39</volume>
<numero>3</numero>
<fpage>392</fpage>
<lpage>404</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0120-99652021000300392&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0120-99652021000300392&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0120-99652021000300392&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT This study aimed to analyze the efficacy of different pre-emergence active ingredients on the suppression of the weed seed bank and the growth of soybeans. The experiments were carried out on a commercial farm located in Brejo (MA, Brazil), during the 2019/2020 harvest. The experiment was designed in randomized blocks with nine treatments and four replicates. The treatments consisted of control (without pre-emergence application), s-metolachlor, flumioxazin + imazethapyr, flu-mioxazin, imazethapyr, trifluralin, diclosulam, diclosulam + imazethapyr, and clomazone + carfentrazone-ethyl. Phytosociological surveys were carried out in pre- and post-planting (10 and 36 d after application - DAA) to control weed competition. Nineteen species of weeds were identified, distributed in 17 genera and 13 botanical families. The species Scoparia dulcis, Richardia scabra, and Cyperus iria exhibited the highest phy-tosociological indices (123.77, 28.62, and 28.29, respectively), estimated at 36 DAA. Flumioxazin and diclosulam were the most efficient in suppressing weed competition, with only 15.63 and 16.13 plants m-2. The highest phytotoxicity scores (3.0) were found at 10 DAA with the application of s-metolachlor, flumioxazin + imazethapyr, trifluralin, and diclosulam + imazethapyr. The pre-emergent control using flumioxazin and diclosulam is recommended for the edaphoclimatic conditions in the Eastern mesoregion of the state of Maranhão, Brazil.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Este estudio tuvo como objetivo analizar la eficacia de diferentes principios activos de preemergencia sobre la supresión del banco de semillas de malezas y el crecimiento de la soya. Los experimentos se llevaron a cabo en una finca de producción agrícola comercial ubicada en el municipio de Brejo (MA, Brasil), durante la cosecha 2019/2020. El diseño experimental fue en bloques al azar con nueve tratamientos y cuatro repeticiones. Los tratamientos consistieron en el control (sin aplicación de preemergencia), S-metolaclor, flumioxazin + imazetapir, flumioxazin, imazetapir, trifluralin, diclosulam, diclosulam + imazetapir, y clomazona + carfentrazone-etil. Se realizaron estudios fitosociológicos antes y después de la siembra (10 y 36 d después de la aplicación - DDA) para controlar la competencia entre malezas. Se identificaron 19 especies de malezas, distribuidas en 17 géneros y 13 familias botánicas. Las especies Scoparia dulcis, Richardia scabra y Cyperus iria obtuvieron los índices fitosociológicos más altos (123.77, 28.62 y 28.29, respectivamente), estimados a los 36 DDA. La flumioxazina y el diclosulam fueron los más eficientes en la supresión de la competencia de malezas, con solo 15.63 y 16.13 plantas m-2. Las puntuaciones más altas de fitotoxicidad (3.0) se encontraron a los 10 DDA con la aplicación de S-metolaclor, flumioxazina + imazetapir, trifluralina y diclosulam + imazetapir. Se recomienda el control preemergente con flumioxazina y diclosulam para las condiciones edafoclimáticas en la mesorregión este del estado de Maranhão, Brasil.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Glycine max (L.) Merrill]]></kwd>
<kwd lng="en"><![CDATA[diclosulam]]></kwd>
<kwd lng="en"><![CDATA[phytosociology]]></kwd>
<kwd lng="en"><![CDATA[pre-emergence herbicides]]></kwd>
<kwd lng="en"><![CDATA[weed competition.]]></kwd>
<kwd lng="es"><![CDATA[Glycine max (L.) Merrill]]></kwd>
<kwd lng="es"><![CDATA[diclosulam]]></kwd>
<kwd lng="es"><![CDATA[fitosociología]]></kwd>
<kwd lng="es"><![CDATA[herbicidas de preemergencia]]></kwd>
<kwd lng="es"><![CDATA[competencia de malezas]]></kwd>
</kwd-group>
</article-meta>
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