<?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>S2301-15482019000100018</article-id>
<article-id pub-id-type="doi">10.31285/agro.23.1.5</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Efecto de la secuencia de cultivos sobre la población nativa de Trichoderma spp. en agricultura sin laboreo]]></article-title>
<article-title xml:lang="en"><![CDATA[Crop Sequence Effects on Native Populations of Trichoderma spp. in No-till Agriculture]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Villar]]></surname>
<given-names><![CDATA[Andrés]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ernst]]></surname>
<given-names><![CDATA[Oswaldo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cadenazzi]]></surname>
<given-names><![CDATA[Mónica]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vero]]></surname>
<given-names><![CDATA[Silvana]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pereyra]]></surname>
<given-names><![CDATA[Silvia]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Altier]]></surname>
<given-names><![CDATA[Nora]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Chouhy]]></surname>
<given-names><![CDATA[Diego]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Langone]]></surname>
<given-names><![CDATA[Fabrizio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pérez]]></surname>
<given-names><![CDATA[Carlos A]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de la República Facultad de Agronomía ]]></institution>
<addr-line><![CDATA[Montevideo ]]></addr-line>
<country>Uruguay</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad de la República Facultad de Química ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Uruguay</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Instituto Nacional de Investigación Agropecuaria  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Uruguay</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2019</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2019</year>
</pub-date>
<volume>23</volume>
<numero>1</numero>
<fpage>18</fpage>
<lpage>27</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.edu.uy/scielo.php?script=sci_arttext&amp;pid=S2301-15482019000100018&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.edu.uy/scielo.php?script=sci_abstract&amp;pid=S2301-15482019000100018&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.edu.uy/scielo.php?script=sci_pdf&amp;pid=S2301-15482019000100018&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: La agricultura ha experimentado un fuerte proceso de cambios que han significado un aumento de las problemáticas sanitarias causadas por patógenos necrotróficos. Diversos trabajos muestran que manejando microorganismos benéfi-cos es posible reducir el impacto de las enfermedades. En base a esto, el objetivo de este trabajo fue determinar el efecto de los cultivos sobre la población de Trichoderma spp. en suelo y en rastrojo, en un sistema agrícola sin laboreo. El monitoreo de la población de Trichoderma spp. se realizó en un experimento con cuatro secuencias de cultivos. Se realizaron muestreos de rastrojo y suelo en primavera y otoño, durante tres años consecutivos. La densidad poblacional de Trichoderma spp. fue determinada mediante el método de dilución y recuento en placa. A su vez, se determinaron las propiedades químicas del suelo de cada tratamiento. Los resultados mostraron que el rastrojo de cebada presentó mayor densidad poblacional de Trichoderma spp. que el rastrojo de otras especies. Las distintas secuencias de cultivo afectaron significativamente la densidad poblacional de este hongo en el suelo. Sin embargo no tuvieron efecto sobre las propiedades químicas del suelo, ni hubo una asociación entre estas y la población de Trichoderma spp. Estos resultados establecen la posibilidad de manejar la población nativa de Trichoderma spp. mediante la elección de los componentes de las secuencias de cultivos, y permiten identificar ambientes más propicios para mantener altas poblaciones de Trichoderma. La identificación de ambientes que favorecen altas poblaciones de Trichoderma podría indicar situaciones más favorables para eventuales inoculaciones del antagonista.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Summary: Agriculture has experienced a strong process of changes that have led to an increase in crop diseases caused by necrotrophic pathogens. Several studies demonstrated that by managing beneficial microorganisms, it is possible to reduce the impact of plant diseases. Based on this, the objective of this study was to determine the effect of field crops on the population of Trichoderma spp. in soil and straw in a no-till cropping system. The population of Trichoderma spp. was monitored in an experiment with four different crop sequences. Samples of soil and crop debris were collected in spring and fall, over three consecutive years. The population density of Trichoderma spp. was determined by dilutions with plate counts method. In addition, soil chemical properties were determined for each treatment. Barley debris showed the highest population density of Trichoderma spp. in relation to other crop debris. Different cropping sequences significantly affected the population density of this fungus in the soil. However, they had no effect on the soil chemical properties, and no association was found between these variables and the population of Trichoderma spp. These results confirm the possibility to handle the native population of Trichoderma spp. through the components of the crop sequences and indicate that conducive environment may support higher populations of Trichoderma. The identification of those environments enhancing Trichoderma could indicate better conditions where inoculations of this antagonist might have higher chances of success.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[control biológico]]></kwd>
<kwd lng="es"><![CDATA[dinámica poblacional]]></kwd>
<kwd lng="es"><![CDATA[rotación de cultivos]]></kwd>
<kwd lng="en"><![CDATA[biological control]]></kwd>
<kwd lng="en"><![CDATA[population dynamics]]></kwd>
<kwd lng="en"><![CDATA[crop rotation]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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