<?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>S2301-15482017000100069</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Dinámica de emergencia y competencia intraespecífica en Conyza sumatrensis]]></article-title>
<article-title xml:lang="en"><![CDATA[Dynamics of Emergence and Intra-specific Competition in Conyza sumatrensis]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gianelli]]></surname>
<given-names><![CDATA[Valeria]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Bedmar]]></surname>
<given-names><![CDATA[Francisco]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ulzurrun]]></surname>
<given-names><![CDATA[Patricia Diez de]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Panaggio]]></surname>
<given-names><![CDATA[Hernán]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto Nacional de Tecnología Agropecuaria Estación Experimental Agropecuaria Balcarce ]]></institution>
<addr-line><![CDATA[Balcarce ]]></addr-line>
<country>Argentina</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,UNMDP Facultad de Ciencias Agrarias ]]></institution>
<addr-line><![CDATA[Balcarce ]]></addr-line>
<country>Argentina</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2017</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2017</year>
</pub-date>
<volume>21</volume>
<numero>1</numero>
<fpage>69</fpage>
<lpage>77</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.edu.uy/scielo.php?script=sci_arttext&amp;pid=S2301-15482017000100069&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.edu.uy/scielo.php?script=sci_abstract&amp;pid=S2301-15482017000100069&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.edu.uy/scielo.php?script=sci_pdf&amp;pid=S2301-15482017000100069&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: Conyza sumatrensis es una de las malezas más problemáticas en Argentina debido a su alta producción de semillas, rápida germinación y gran dispersión. En los últimos años, su presencia se incrementó en todas las áreas donde se realiza la producción de cultivos bajo siembra directa. Si bien es una especie muy prolífica, bajo condiciones de competencia intraespecífica puede afectarse su comportamiento. El objetivo de este trabajo fue evaluar la dinámica de emergencia de C. sumatrensis y la competencia intraespecífica como proceso de autoregulación poblacional. Los ensayos se realizaron en la Estación Experimental Agropecuaria de Balcarce, INTA Argentina. La emergencia de plántulas se registró mensualmente. Los efectos de la competencia intraespecífica se evaluaron a partir de las respuestas en crecimiento y fecundidad frente a densidades entre 0 y 600 plantas m-2. La emergencia de C. sumatrensis se concentró durante el otoño (60 %), observándose un segundo pico (20 %) en primavera. El incremento de la densidad de plantas provocó una disminución en la altura, número de ramificaciones y biomasa (radicular, aérea y reproductiva), así como en la producción de semillas por planta. El crecimiento y la fecundidad se redujeron hasta una densidad de 75 plantas m-2, por encima de la cual permanecieron relativamente constantes. Los resultados obtenidos demostraron que existió un proceso de regulación poblacional que podría restringir el potencial reproductivo de la especie, y permitirían además estimar las condiciones óptimas para obtener determinados tamaños de plantas y evaluar las respuestas poblacionales a la aplicación de los tratamientos químicos.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Summary: Conyza sumatrensis is one of the most problematic weeds in Argentina because of its high seed production, rapid germination and a high dispersal ability of the seeds. In the last years, its presence has increased in all areas under no tillage. Although it is a very prolific species, intraspecific competence may affect its behavior. The objective of this work was to evaluate the pattern of emergence of C. sumatrensis and the intraspecific competition as a self-regulation process. Trials were conducted at the Agricultural Experimental Station of Balcarce, INTA, Argentina. Weed emergency was recorded monthly. Competitive ability was assessed by the response of growth and fecundity to densities ranging between 0 to 600 plants m-2. Emergence of C. sumatrensis was concentrated during the autumn (60 %) while a second peak was observed in the spring (20 %). The increase in plant density caused a decrease in height, number of branches and biomass (underground, aerial, and reproductive), as well as in seed production per plant. Growth and fecundity decreased until density reached 75 plants m-2, above it they remained relatively constant. Results indicated a regulating effect on C. sumatrensis population that could restrict the reproductive potential of this species, and would also allow to estimate the optimal conditions to obtain certain sizes of plants and to evaluate the population responses to the application of the chemical treatments.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[rama negra]]></kwd>
<kwd lng="es"><![CDATA[flujo de emergencia]]></kwd>
<kwd lng="es"><![CDATA[potencial reproductivo]]></kwd>
<kwd lng="es"><![CDATA[regulación poblacional]]></kwd>
<kwd lng="en"><![CDATA[horseweed]]></kwd>
<kwd lng="en"><![CDATA[flow of emergence]]></kwd>
<kwd lng="en"><![CDATA[reproductive potential]]></kwd>
<kwd lng="en"><![CDATA[population regulation]]></kwd>
</kwd-group>
</article-meta>
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