<?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>0012-7353</journal-id>
<journal-title><![CDATA[DYNA]]></journal-title>
<abbrev-journal-title><![CDATA[Dyna rev.fac.nac.minas]]></abbrev-journal-title>
<issn>0012-7353</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional de Colombia]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0012-73532020000200075</article-id>
<article-id pub-id-type="doi">10.15446/dyna.v87n213.75361</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Calibration of two capacitive soil moisture sensors in Ultisol]]></article-title>
<article-title xml:lang="es"><![CDATA[Calibración de dos sensores capacitivos de humedad en un Ultisol]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[de los Ángeles Calva Jiménez]]></surname>
<given-names><![CDATA[Anabel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Duarte Guedes Cabral de Almeida]]></surname>
<given-names><![CDATA[Ceres]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Santos Júnior]]></surname>
<given-names><![CDATA[José Amilton dos]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Silva dos Santos]]></surname>
<given-names><![CDATA[Célia]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidade Federal Rural de Pernambuco  ]]></institution>
<addr-line><![CDATA[Recife ]]></addr-line>
<country>Brazil</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidade Federal Rural de Pernambuco  ]]></institution>
<addr-line><![CDATA[São Lourenço da Mata ]]></addr-line>
<country>Brazil</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2020</year>
</pub-date>
<volume>87</volume>
<numero>213</numero>
<fpage>75</fpage>
<lpage>79</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0012-73532020000200075&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0012-73532020000200075&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0012-73532020000200075&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract The objectives of this study were to perform the calibration and determine the calibration equations of two ECH2O soil moisture sensors, for an Ultisol, collected in the Municipality of Pesqueira-PE located in Brazilian semi-arid region. The study was carried out in 5-liter plastic containers in a protected environment at the Federal Rural University of Pernambuco, Recife-PE, where soil moisture was daily monitored for 51 days from saturation moisture to natural drying. The authors verified that the ECH2O sensors showed an exponential response to the variation of soil moisture, obtaining R2&gt;0.97. RMSE values ranged from 0.065 to 0.012 m3 m-3 for the 5TE sensor and from 0.045 to 0.011 m3 m-3 for the EC-5 sensor. The researchers concluded that the calibration equations obtained were more accurate than the factory equations for that type of soil.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Los objetivos de este estudio fueron realizar la calibración y determinar las ecuaciones de calibración de dos sensores de humedad de suelo ECH2O para un suelo Ultisol colectado en el Municipio de Pesqueira-PE, localizado en el Semiárido Brasileño. El estudio se llevó a cabo en baldes plásticos de 5 litros implementados en ambiente protegido en la Universidad Federal Rural de Pernambuco, Recife-PE, donde se realizó el monitoreo diario de la humedad del suelo durante 51 días, desde la humedad de saturación hasta el secado natural. Los autores verificaron que los sensores ECH2O presentaron una respuesta exponencial a la variación de humedad de suelo obteniendo R2&gt;0,97. Valores de RMSE variaron de 0,065 a 0,012 m3 m-3 para el sensor 5TE y de 0,045 a 0,011 m3 m-3 para el EC-5. Los investigadores concluyeron que las ecuaciones de calibración obtenidas fueron más precisas que las ecuaciones de fábrica para ese tipo de suelo.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[capacitance]]></kwd>
<kwd lng="en"><![CDATA[water content soil probe, 5TE, EC-5]]></kwd>
<kwd lng="es"><![CDATA[capacitancia]]></kwd>
<kwd lng="es"><![CDATA[sonda de humedad del suelo, 5TE, EC-5]]></kwd>
</kwd-group>
</article-meta>
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<label>[23]</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Fares]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Abbas]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
<name>
<surname><![CDATA[Domingos]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Mair]]></surname>
<given-names><![CDATA[A]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Improved calibration functions of three capacitance probes for the measurement of soil moisture in tropical soils]]></article-title>
<source><![CDATA[Sensors]]></source>
<year>2011</year>
<volume>11</volume>
<numero>5</numero>
<issue>5</issue>
<page-range>4858-74</page-range></nlm-citation>
</ref>
</ref-list>
</back>
</article>
