<?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>2301-1548</journal-id>
<journal-title><![CDATA[Agrociencia (Uruguay)]]></journal-title>
<abbrev-journal-title><![CDATA[Agrociencia Uruguay]]></abbrev-journal-title>
<issn>2301-1548</issn>
<publisher>
<publisher-name><![CDATA[Facultad de Agronomía - Instituto Nacional de Investigación Agropecuaria]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2301-15482020000101303</article-id>
<article-id pub-id-type="doi">10.31285/agro.24.112</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Analysis of the agronomic interest characteristics for the management of Conyza blakei, Conyza bonariensis, Conyza sumatrensis, and Conyza lorentzii]]></article-title>
<article-title xml:lang="es"><![CDATA[Análisis de caracteres de interés agronómico para el manejo de Conyza blakei, Conyza bonariensis, Conyza sumatrensis y Conyza lorentzii]]></article-title>
<article-title xml:lang="pt"><![CDATA[Análise de características de interesse agronômico para o manejo de Conyza blakei, Conyza bonariensis, Conyza sumatrensis e Conyza lorentzii]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Diez de Ulzurrun]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Acedo]]></surname>
<given-names><![CDATA[M.B.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Garavano]]></surname>
<given-names><![CDATA[M.E.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gianelli]]></surname>
<given-names><![CDATA[V.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ispizua]]></surname>
<given-names><![CDATA[V.N.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional de Mar del Plata Facultad de Ciencias Agrarias de Balcarce ]]></institution>
<addr-line><![CDATA[Balcarce ]]></addr-line>
<country>Argentina</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional de Mar del Plata Facultad de Ciencias Agrarias de Balcarce ]]></institution>
<addr-line><![CDATA[Balcarce ]]></addr-line>
<country>Argentina</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Nacional de Mar del Plata Facultad de Ciencias Agrarias de Balcarce ]]></institution>
<addr-line><![CDATA[Balcarce ]]></addr-line>
<country>Argentina</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Instituto Nacional de Tecnología Agropecuaria Estación Experimental Agropecuaria Balcarce ]]></institution>
<addr-line><![CDATA[Balcarce ]]></addr-line>
<country>Argentina</country>
</aff>
<aff id="Af5">
<institution><![CDATA[,Universidad Nacional de Mar del Plata Facultad de Ciencias Agrarias de Balcarce ]]></institution>
<addr-line><![CDATA[Balcarce ]]></addr-line>
<country>Argentina</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2020</year>
</pub-date>
<volume>24</volume>
<numero>1</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.edu.uy/scielo.php?script=sci_arttext&amp;pid=S2301-15482020000101303&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.edu.uy/scielo.php?script=sci_abstract&amp;pid=S2301-15482020000101303&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.edu.uy/scielo.php?script=sci_pdf&amp;pid=S2301-15482020000101303&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: Conyza genus includes herbs of ruderal habit, also referred to as weeds in pastures, perennial crops, and no-tillage crops. The unsuitable use of herbicides, the incorrect identification of species, and the lack of monitoring, among others, explain the fact that Conyza species have become a growing problem in production systems under no-tillage. Therefore, the knowledge of the biology and the adaptive response to diverse cultural practices is paramount. Two of the most important characteristics to establish management guidelines are the height and growth stages of these species since their herbicide sensitivity has been associated with these characteristics. The objective of this study was to analyze the results that affect the reproductive success (germination %, fecundity), and the most effective weed control time (height and determination of the phenological stages) of Conyza blakei, C. bonariensis, C. lorentzii, and C. sumatrensis. Trials were conducted at the Agricultural Experimental Station of Balcarce, inta, Argentina. We analyzed 35 individuals of each species. The germination percentage presented significant differences, being C. sumatrensis the species with the highest number of emerged seedlings. The phenological stages also showed differences, being C. bonariensis the species that began to elongate the stem earliest, the first in flowering, and that had the greatest fecundity. The senescence of the 4 species occurred within the first year of growth. The species with greater reproductive success would be C. bonariensis and C. sumatrensis, the first requiring earlier control practices.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: El género Conyza incluye hierbas de hábito ruderal, también citadas como malezas en pasturas, cultivos perennes y cultivos sin labranza. El uso inadecuado de herbicidas, la incorrecta identificación de especies y la falta de monitoreo, entre otros, explican el hecho de que las especies de «rama negra» se hayan convertido en un problema creciente en sistemas de producción bajo siembra directa. Por lo tanto, resulta primordial el conocimiento de su biología y la repuesta adaptativa a diversas prácticas culturales. Dos de las características más importantes para establecer pautas de manejo son la altura y estado de desarrollo fenológico, ya que la sensibilidad a herbicidas está ligada a dichos caracteres. Se planteó como objetivo analizar parámetros que afecten el éxito reproductivo (% de germinación, fecundidad) y el momento óptimo de control (altura y determinación de las etapas fenológicas) de Conyza blakei, C. bonariensis, C. lorentzii y C. sumatrensis. Los ensayos se realizaron en la Estación Experimental Agropecuaria de Balcarce, inta, Argentina. Se analizaron 35 individuos de cada especie. El porcentaje de germinación presentó diferencias significativas, C. sumatrensis fue la especie con mayor cantidad de plantas emergidas. Las etapas fenológicas también mostraron diferencias, C. bonariensis fue la especie que comenzó a elongar el tallo en forma más temprana, y la primera en llegar a floración, presentando también la mayor fecundidad. La senescencia de las 4 especies se produjo dentro del primer año de crecimiento. Las especies con mayor éxito reproductivo fueron C. bonariensis y C. sumatrensis, requiriendo la primera controles más tempranos.]]></p></abstract>
<abstract abstract-type="short" xml:lang="pt"><p><![CDATA[Resumo: O gênero Conyza inclui ervas de hábito ruderal, também citadas como ervas daninhas em pastagens, culturas perenes e culturas sem lavoura. O uso indevido de herbicidas, a identificação incorreta de espécies e a falta de monitoramento, entre outros, explicam o fato de que espécies de "rama negra" se tornaram um problema crescente em sistemas de produção sob semeadura direta. Portanto, o conhecimento de sua biologia e a resposta adaptativa a várias práticas culturais são essenciais. Duas das características mais importantes para o estabelecimento de diretrizes de manejo são altura e estágio do desenvolvimento fenológico, uma vez que a sensibilidade aos herbicidas está ligada a essas características. O objetivo foi analisar parâmetros que afetam o sucesso reprodutivo (% de germinação, fertilidade) e o momento ótimo de controle (altura e determinação dos estágios fenológicos) de Conyza blakei, C. bonariensis, C. lorentzii e C. sumatrensis. Os testes foram realizados na Estação Experimental Agrícola de Balcarce, (INTA), Argentina. Foram analisados 35 indivíduos de cada espécie. A porcentagem de germinação apresentou diferenças significativas, C. sumatrensis foi a espécie com maior número de plantas emergidas. Os estágios fenológicos também apresentaram diferenças, C. bonariensis foi a espécie que começou a alongar o caule mais cedo e a primeira a atingir a floração, apresentando também a maior fertilidade. A senescência das 4 espécies ocorreu dentro do primeiro ano de crescimento. As espécies com maior sucesso reprodutivo foram C. bonariensis e C. sumatrensis, os primeiros controles que exigiram o primeiro.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[weeds]]></kwd>
<kwd lng="en"><![CDATA[stage of development]]></kwd>
<kwd lng="en"><![CDATA[germination]]></kwd>
<kwd lng="en"><![CDATA[fecundity]]></kwd>
<kwd lng="en"><![CDATA[cycle]]></kwd>
<kwd lng="es"><![CDATA[malezas]]></kwd>
<kwd lng="es"><![CDATA[estadios de desarrollo]]></kwd>
<kwd lng="es"><![CDATA[germinación]]></kwd>
<kwd lng="es"><![CDATA[fecundidad]]></kwd>
<kwd lng="es"><![CDATA[ciclo]]></kwd>
<kwd lng="pt"><![CDATA[ciclo]]></kwd>
<kwd lng="pt"><![CDATA[estágios de desenvolvimento]]></kwd>
<kwd lng="pt"><![CDATA[fertilidade]]></kwd>
<kwd lng="pt"><![CDATA[germinação]]></kwd>
<kwd lng="pt"><![CDATA[plantas daninhas]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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