<?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>0379-3982</journal-id>
<journal-title><![CDATA[Revista Tecnología en Marcha]]></journal-title>
<abbrev-journal-title><![CDATA[Tecnología en Marcha]]></abbrev-journal-title>
<issn>0379-3982</issn>
<publisher>
<publisher-name><![CDATA[Instituto Tecnológico de Costa Rica]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0379-39822018000200098</article-id>
<article-id pub-id-type="doi">10.18845/tm.v31i2.3627</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Efectos de la aplicación de Trichoderma asperellum y su filtrado en el crecimiento de almácigos de cebolla (Allium cepa)]]></article-title>
<article-title xml:lang="en"><![CDATA[Effects of the application of Trichoderma asperellum and its culture filtrate on the growth of onion seedlings]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rivera-Méndez]]></surname>
<given-names><![CDATA[William]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Brenes-Madriz]]></surname>
<given-names><![CDATA[Jaime]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Zúñiga-Vega]]></surname>
<given-names><![CDATA[Claudia]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto Tecnológico de Costa Rica  ]]></institution>
<addr-line><![CDATA[Cartago ]]></addr-line>
<country>Costa Rica</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Instituto Tecnológico de Costa Rica  ]]></institution>
<addr-line><![CDATA[ Cartago]]></addr-line>
<country>Costa Rica</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Instituto Tecnológico de Costa Rica  ]]></institution>
<addr-line><![CDATA[ Cartago]]></addr-line>
<country>Costa Rica</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2018</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2018</year>
</pub-date>
<volume>31</volume>
<numero>2</numero>
<fpage>98</fpage>
<lpage>105</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S0379-39822018000200098&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S0379-39822018000200098&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S0379-39822018000200098&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen La aplicación de Trichoderma spp en el cultivo de la cebolla se ha enfocado principalmente hacia el combate de enfermedades como Sclerotium cepivorum, su principal problema fitopatológico. Con la aplicación de biocontroladores se busca, además de reducir el uso de fungicidas químicos, preparar a la planta desde los primeros estadios del almácigo con la aplicación de filtrados, que fortalezcan y colonicen la raíz, brindándole una protección contra el ataque de los patógenos. El objetivo de esta investigación consistió en determinar los efectos de una cepa nativa de Trichoderma asperellum y un filtrado de metabolitos secundarios sobre el crecimiento de almácigos de cebolla (Allium cepa). La investigación se realizó en dos ciclos de cultivo; uno en el 2015 y otro en el 2016. Se realizaron aplicaciones cada 10 días de los diferentes tratamientos, cada tratamiento consistió de 2 bandejas, cada una con 288 plantas: T 1= T. asperellum preparado al 100%, T2= T. asperellum preparado al 50%, T3= Producto comercial Vitavax®, T4= Testigo, T5= Filtrado al 100% y T6= Filtrado al 50%. En el 2015 solo se probaron los cuatro primeros tratamientos. Para el 2015, se observó que T1 es el mejor tratamiento, ya que mostró un mayor efecto en la elongación y el peso seco radical, así como en el peso fresco de la raíz y el peso seco aéreo. En la elongación de la raíz para el 2016, los tratamientos de T2, T1 y T6 son los que presentaron los mayores tamaños. Con base en lo observado, el tratamiento del filtrado al 50% tiene los mismos efectos que los tratamientos T1 y T2 en todas las variables.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract The application of Trichoderma spp in onion has focused mainly on the fight against diseases such as Sclerotium cepivorum, its principal phytopathological problem. With the application of biocontrollers, we seek to reduce the use of chemical fungicides and to prepare the plant from the first stages of the seedbed with the application of culture filtrate that strengthen and colonize the root providing a protection against the attack of pathogens. The objective of this research was to determine the effects of a native strain of Trichoderma asperellum and a secondary metabolite culture filtrate on the growth of onion seedlings (Allium cepa). The research was made in two different years: 2015 and 2016. Each treatment consisted of 2 trays, each with 288 plants: T 1 = T. asperellum prepared at 100%, T2 = T. asperellum prepared at 50%, T3 = Vitavax commercial product ®, T4 = Control, T5 = 100% filtered and T6 = 50% filtered. In 2015 were tested only the first four treatments. By 2015, it was observed that T1 is the best treatment, as it showed a greater effect on elongation and dry weight as well as on fresh root weight and aerial dry weight. In the elongation of the root for 2016, the T2, T1 and T6 treatments presented the largest sizes. Based on the observed, treatment of 50% filtrate has the same effects as treatments T1 and T2 in all variables.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Trichoderma asperellum]]></kwd>
<kwd lng="es"><![CDATA[filtrados]]></kwd>
<kwd lng="es"><![CDATA[biocontrol]]></kwd>
<kwd lng="es"><![CDATA[Allium cepa]]></kwd>
<kwd lng="es"><![CDATA[promoción del crecimiento]]></kwd>
<kwd lng="en"><![CDATA[Trichoderma asperellum]]></kwd>
<kwd lng="en"><![CDATA[filtrates]]></kwd>
<kwd lng="en"><![CDATA[biocontrol]]></kwd>
<kwd lng="en"><![CDATA[Allium cepa]]></kwd>
<kwd lng="en"><![CDATA[growth promotion]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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