<?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>S0379-39822020000300090</article-id>
<article-id pub-id-type="doi">10.18845/tm.v33i3.4466</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Construcción de una mesa de succión de doble capa de bajo costo para definir macroporosidad (porosidad drenable) y microporosidad]]></article-title>
<article-title xml:lang="en"><![CDATA[Construction of a low-cost suction table to define macroporosity (drainable porosity) and microporosity]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Chavarría-Vidal]]></surname>
<given-names><![CDATA[Adrián Enrique]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Miranda]]></surname>
<given-names><![CDATA[Jarbas Honorio de]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Farias-Ramírez]]></surname>
<given-names><![CDATA[Asdrubal]]></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[ ]]></addr-line>
<country>Costa Rica</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidade de São Paulo Escola Superior de Agricultura Luis de Queiroz ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Brazil</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidade de São Paulo Escola Superior de Agricultura Luis de Queiroz ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Brazil</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>09</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>09</month>
<year>2020</year>
</pub-date>
<volume>33</volume>
<numero>3</numero>
<fpage>90</fpage>
<lpage>97</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S0379-39822020000300090&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S0379-39822020000300090&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S0379-39822020000300090&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen La necesidad de conocer la porosidad drenable del suelo o macroporosidad con fines de manejar correctamente el agua en el suelo, sea ésta con fines de riego o con fines de drenaje ha tomado cada vez mayor relevancia. Para ello existen equipos que se ofrecen en casas comerciales generalmente de costos altos. No obstante, conociendo la física del agua en una matriz arenosa se puede construir una mesa de succión (mesa de tensión) con arena llamada comúnmente caja de arena para estimar la macro y microporosidad y como tal la porosidad total presente en un suelo. Las micro porosidades obtenidas para un suelo arenoso expresado en contenido de humedad volumétrica sometido a una succión de 60 cmca (centímetros de columna de agua) y a 100 cmca fueron 11,12% y 5,73% respectivamente y las macro porosidades obtenidas y expresadas en términos de porcentaje de humedad volumétrica para un suelo arenoso sometido a una succión de 60 cmca y a 100 cmca fueron 25,14% y 30,53%.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract The need to know the drainable porosity of the soil or macro porosity in order to correctly manage the water in the soil, whether it is for irrigation purposes or for drainage purposes, has taken on increasing relevance. For this there are equipment that is offered in commercial houses, usually with high costs. However, knowing the physics of water in a sandy matrix, you can build a suction table (tension table) with sand commonly called sandbox to estimate the macro and micro porosity and as such the total porosity present in a soil. The micro porosity obtained for a sandy soil subjected to a suction of 60 cmca (centimeters of water column) and 100 cmca were 11,12% and 5,73% of gravimetric humidity and the macro porosity obtained and expressed in terms of percentage of gravimetric humidity ((gwater/gsoil) * 100) for a sandy soil subjected to a suction of 60 cmca and 100 cmca were 25,14% and 30,53%.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Macro porosidad]]></kwd>
<kwd lng="es"><![CDATA[micro porosidad]]></kwd>
<kwd lng="es"><![CDATA[porcentaje humedad gravimétrica]]></kwd>
<kwd lng="es"><![CDATA[porcentaje de humedad volumétrica]]></kwd>
<kwd lng="en"><![CDATA[Macro porosity]]></kwd>
<kwd lng="en"><![CDATA[micro porosity]]></kwd>
<kwd lng="en"><![CDATA[gravimetric humidity percentage]]></kwd>
<kwd lng="en"><![CDATA[volume humidity percentage]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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