<?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>2011-2173</journal-id>
<journal-title><![CDATA[Revista Colombiana de Ciencias Hortícolas]]></journal-title>
<abbrev-journal-title><![CDATA[rev.colomb.cienc.hortic.]]></abbrev-journal-title>
<issn>2011-2173</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Colombiana de Ciencias Hotícolas, Universidad Pedagógica y Tecnológica de Colombia]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2011-21732019000100071</article-id>
<article-id pub-id-type="doi">10.17584/rcch.2019vl3il.7938</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Effectiveness of reduced doses of flumioxazin herbicide at weed control in direct sow onions]]></article-title>
<article-title xml:lang="es"><![CDATA[Efectividad del herbicida flumioxazin a dosis reducida para el control de malezas en cebollas de siembra directa]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[MELO]]></surname>
<given-names><![CDATA[CHRISTIANE AUGUSTA DINIZ]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[REIS]]></surname>
<given-names><![CDATA[MARCELO RODRIGUES DOS]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[BARBOSA]]></surname>
<given-names><![CDATA[AMANDA ROCHA]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[DIAS]]></surname>
<given-names><![CDATA[ROQUE DE CARVALHO]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[SILVA]]></surname>
<given-names><![CDATA[GUSTAVO SOARES DA]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidade Federal do Triângulo Mineiro Iturama Campus ]]></institution>
<addr-line><![CDATA[Iturama ]]></addr-line>
<country>Brazil</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidade Federal do Triângulo Mineiro Iturama Campus ]]></institution>
<addr-line><![CDATA[Iturama ]]></addr-line>
<country>Brazil</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidade Federal de Viçosa Rio Paranaíba Campus ]]></institution>
<addr-line><![CDATA[Rio Paranaíba ]]></addr-line>
<country>Brazil</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Universidade Estadual Paulista &#8220;Júlio de Mesquita Filho&#8221; Faculty of Agricultural Sciences ]]></institution>
<addr-line><![CDATA[Botucatu ]]></addr-line>
<country>Brazil</country>
</aff>
<aff id="Af5">
<institution><![CDATA[,aff5  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Brazil</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>04</month>
<year>2019</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>04</month>
<year>2019</year>
</pub-date>
<volume>13</volume>
<numero>1</numero>
<fpage>71</fpage>
<lpage>80</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S2011-21732019000100071&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S2011-21732019000100071&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S2011-21732019000100071&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT The recommended application of most herbicides in onion crops is after transplanting seedlings with four true leaves. In the direct sowing system, this recommendation is considered late; an alternative manage ment is the application of reduced doses starting with a true leaf. The objective of this study was to evaluate the use of reduced doses of flumioxazin in the early phenological stages of onions on bulb yield. Two field experiments were installed, and five doses of flumioxazin (5, 10, 15, 20, and 25 g ha-1) were applied in three phenological stages (1st, 2nd, and 1st+3rd true leaf); weed control was carried out. The results demonstrated the efficacy of reduced doses of flumioxazin on onion crop in the early stages. The dose of 20 g ha-1 showed use potential in the two experiments for the cvs. Perfecta and Sirius, enabling reductions of 77 to 88% of the commercial dose recommended for onions established with seedling transplanting. The application of flumioxazin in the 2nd leaf reduced commercial productivity and was ineffective in the control of weeds. The application in the 1st + 3rd leaf, despite being an effective control, caused greater phototoxicity and, therefore, reduced commercial productivity. The best strategy for weed management is 20 g ha-1 flumioxazin applied to onion plants when they reach the true first leaf stage.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Se recomienda en la mayoría de las veces la aplicación de herbicidas en cultivos de cebolla después del trasplante, cuando las plántulas tienen cuatro hojas verdaderas. En el sistema de siembra directa esta recomendación se consi dera tardía y una alternativa es la aplicación de menores dosis desde la aparición de una hoja verdadera de la cebolla. El objetivo de este estudio fue evaluar dosis reducidas de flumioxazina en estadios fenológicos tempranos de cebolla sobre el rendimiento de los bulbos. Se realizaron dos experimentos de campo y se aplicaron cinco dosis de flumioxazina (5, 10, 15, 20 y 25 g ha-1) en tres estadios fenológicos (1a, 2a y 1a + 3a hoja verdadera), manteniendo un control con deshierbe manual. Los resultados demostraron la eficacia de dosis reducidas de flumioxazina en el cultivo de cebolla en estadios fenológicos tempranos. La dosis de 20 g ha-1 mostró un potencial en los dos experimentos para cultivares Perfecta y Sirius, lo que permite reducirse entre el 77 y 88% de la dosis comercial recomendada en plántu las cebolla trasplantada. La aplicación de flumioxazina en la 2a hoja redujo la productividad comercial y fue ineficaz en el control de malezas. La aplicación en la 1a + 3a hoja, a pesar de ser efectiva en el control, provocó una mayor fitotoxicidad y, por lo tanto, redujo la productividad comercial. La mejor estrategia para el manejo de malezas es 20 g ha-1 de flumioxazina aplicada a las plantas de cebolla cuando alcanzan la etapa de la primera hoja verdadera.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Allium cepa]]></kwd>
<kwd lng="en"><![CDATA[bulb yield]]></kwd>
<kwd lng="en"><![CDATA[herbicide]]></kwd>
<kwd lng="en"><![CDATA[phytotoxicity]]></kwd>
<kwd lng="es"><![CDATA[Allium cepa]]></kwd>
<kwd lng="es"><![CDATA[rendimiento de bulbos]]></kwd>
<kwd lng="es"><![CDATA[herbicida]]></kwd>
<kwd lng="es"><![CDATA[fitotoxicidad]]></kwd>
</kwd-group>
</article-meta>
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<year>2010</year>
<volume>9</volume>
<numero>42</numero>
<issue>42</issue>
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</article>
