<?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>0377-9424</journal-id>
<journal-title><![CDATA[Agronomía Costarricense]]></journal-title>
<abbrev-journal-title><![CDATA[Agron. Costarricense]]></abbrev-journal-title>
<issn>0377-9424</issn>
<publisher>
<publisher-name><![CDATA[Universidad de Costa Rica. Colegio de Ingenieros y Agrónomos. Ministerio de Agricultura y Ganadería]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0377-94242018000200059</article-id>
<article-id pub-id-type="doi">10.15517/rac.v42i2.33779</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Parámetros para el manejo del agua en tomate y chile dulce hidropónico bajo invernadero]]></article-title>
<article-title xml:lang="en"><![CDATA[Water management parameters in hydroponic tomatoes and sweet pepper under greenhouse]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Soto Bravo]]></surname>
<given-names><![CDATA[Freddy]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de Costa Rica  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Costa Rica</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2018</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2018</year>
</pub-date>
<volume>42</volume>
<numero>2</numero>
<fpage>59</fpage>
<lpage>73</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S0377-94242018000200059&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S0377-94242018000200059&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S0377-94242018000200059&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen El intervalo hídrico óptimo, basado en umbrales de humedad volumétrica en el sustrato (&#952; vs), permite un control preciso del volumen y la frecuencia de riego. Se determinaron los umbrales de &#952; vs para el manejo del riego en los cultivos de tomate y chile dulce en fibra de coco en los invernaderos de la Estación Experimental Agrícola Fabio Baudrit Moreno (EEAFBM), Alajuela, Costa Rica, en el 2015. En ambos cultivos se aplicó un tratamiento con riego (CR) y otro sin riego (SR), en un diseño completamente aleatorio. Se evaluó el contenido de &#952; vs, el potencial hídrico (&#968;h) y la temperatura de la hoja (Th) y se estimó la evapotranspiración de ambos cultivos mediante un balance de agua en el sustrato. El umbral de &#952; vs en la fibra de coco, para el manejo del riego en ambos cultivos, podría establecerse en el rango de agua fácilmente disponible de 56% a 38%, donde los valores de &#968;h fueron inferiores al umbral crítico de &lt; -1 MPa reportado por diferentes autores y las Th fueron similares a la temperatura del aire. En los tratamientos CR, los promedios de &#952; vs en tomate (44%) y chile dulce (50%) estuvieron dentro del rango de agua fácilmente disponible (38% a 56%) de la fibra de coco. En las pruebas SR de ambos cultivos, la &#952; vs descendió a un valor promedio de 32%, próximo al punto de marchitez permanente. En &#968;h y Th las diferencias entre experimentos fueron de mayor magnitud al m.d. del día 2, donde los tratamientos CR fueron -0,84 MPa en tomate y -0,98 MPa en chile dulce; mientras que en las prácticas SR fueron -1,24 MPa en tomate y -1,3 MPa en chile dulce. Al m.d. del día 2, las Th de ambos cultivos en los diseños SR y CR fueron similares e inferiores, respectivamente, a la temperatura del aire (32,9°C).]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract The optimal water interval based on volumetric moisture thresholds in the substrate (&#952;vs), allows precise control of the volume and frequency of irrigation. The research determined the thresholds of &#952;vs for irrigation management in tomato and sweet pepper crops in coconut fiber in the greenhouses at the Fabio Baudrit Moreno Agricultural Research Station (EEAFBM), Alajuela, Costa Rica, 2015. In both crops, there were 2 treatments: with irrigation (CR) and without irrigation (SR), in a completely random design. The content of water &#952;vs, the water potential (&#968;h) and the leaf temperature (Th) were evaluated and the evapotranspiration of both crops was estimated by means of a water balance in the substrate. The &#952;vs threshold for water management in coconut fiber and both crops could be established in the readily available water range of 56% to 38%, where the &#968;h values were below the critical threshold of &lt; -1 MPa reported by different authors and the Th were similar to the air temperature. The averages of &#952;vs in tomato (44%) and sweet pepper (50%) in CR treatments were within the range of readily available water (38% to 56%) of the coconut fiber. In the SR treatments of both crops, the &#952;vs decreased to an average value of 32%, close to the permanent wilting point. The differences between treatments of the &#968;h and Th were of higher magnitude at midday of 2nd day. The &#968;h in CR treatments were -0.84 MPa and -0.98 MPa, meanwhile in SR treatments they were -1.24 MPa and -1.3 MPa, in tomato and sweet pepper respectively. At midday of 2nd day, the Th of both crops and treatments were similar and lower, respectively, to the air temperature (32.9°C).]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Manejo del riego]]></kwd>
<kwd lng="es"><![CDATA[potencial hídrico]]></kwd>
<kwd lng="es"><![CDATA[humedad del sustrato]]></kwd>
<kwd lng="es"><![CDATA[intervalo hídrico óptimo]]></kwd>
<kwd lng="es"><![CDATA[punto de relleno]]></kwd>
<kwd lng="en"><![CDATA[Irrigation management]]></kwd>
<kwd lng="en"><![CDATA[water potential]]></kwd>
<kwd lng="en"><![CDATA[substrate moisture]]></kwd>
<kwd lng="en"><![CDATA[optimal water content interval]]></kwd>
<kwd lng="en"><![CDATA[refill point]]></kwd>
</kwd-group>
</article-meta>
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