<?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>S0012-73532018000400060</article-id>
<article-id pub-id-type="doi">10.15446/dyna.v85n207.71897</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[FDR ECH2O sensor performance in Spodosols]]></article-title>
<article-title xml:lang="es"><![CDATA[Desempeño de un sensor FDR ECH2O en Espodosuelos]]></article-title>
</title-group>
<contrib-group>
<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[Oliveira Silva]]></surname>
<given-names><![CDATA[Denize Maria]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gomes de Almeida]]></surname>
<given-names><![CDATA[Brivaldo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[de França e Silva]]></surname>
<given-names><![CDATA[Ênio Farias]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Neves Barbosa]]></surname>
<given-names><![CDATA[Rebeca]]></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]]></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[São Lourenço da Mata ]]></addr-line>
<country>Brazil</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidade Federal Rural de Pernambuco Departamento de Engenharia Agrícola ]]></institution>
<addr-line><![CDATA[Recife ]]></addr-line>
<country>Brazil</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidade Federal Rural de Pernambuco Departamento de Agronomia ]]></institution>
<addr-line><![CDATA[Recife ]]></addr-line>
<country>Brazil</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>85</volume>
<numero>207</numero>
<fpage>60</fpage>
<lpage>64</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0012-73532018000400060&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0012-73532018000400060&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0012-73532018000400060&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Frequency domain reflectometry (FDR) is widely used to measure soil water content. However, the effects of soil composition on FDR calibration have to be quantified to reduce the need for further calibration. Our objectives were to: (1) evaluate the accuracy of EC-5 for measuring water content in sandy soils, and (2) develop a soil-specific sensor calibration curve. Disturbed and undisturbed soil samples were collected in one Spodosol profile (07º 37&#8217; 30&#8221; S, 34º 57&#8217; 30&#8221; W) representative of the region where sugarcane is grown in northeastern Brazil. Regression analysis showed good accuracy and low error (RMSE = 0.01 m3 m-3), while without specific calibration the error was higher (RMSE = 0.06 m3 m-3). The EC-5 sensor should be subjected to field-specific calibration in sandy soils due to the low field capacity and water content during the growing season.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen La Reflectometría en el Dominio de Frecuencia (FDR) es ampliamente utilizada para medir el contenido de agua en el suelo. Sin embargo los efectos de la composición del suelo en la calibración de FDR deben de cuantificarse para reducir la necesidad de una calibración adicional. Nuestros objetivos fueron: (1) evaluar la precisión del sensor EC-5 para medir el contenido de agua en suelos arenosos y (2) desarrollar la curva de calibración del sensor específica del suelo. Muestras de suelo disturbadas y no disturbadas fueron recogidas en un perfil de Spodosol (07º 37&#8217; 30&#8221; S, 34º 57&#8217; 30&#8221; W) representativo de una región productora de caña de azúcar, en el Noreste de Brasil. Los resultados del análisis de regresión mostraron una buena precisión y bajo error (RMSE = 0.01 m3 m-3), mientras que sin calibración específica el error fue mayor (RMSE = 0.06 m3 m-3). El sensor EC-5 debe de someterse a calibración específica en el campo en suelos arenosos debido a la baja capacidad de campo y contenido de agua en el periodo de crecimiento de la planta.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[EC-5]]></kwd>
<kwd lng="en"><![CDATA[sandy soil]]></kwd>
<kwd lng="en"><![CDATA[volumetric water content]]></kwd>
<kwd lng="en"><![CDATA[probe]]></kwd>
<kwd lng="en"><![CDATA[capacitance]]></kwd>
<kwd lng="es"><![CDATA[EC-5]]></kwd>
<kwd lng="es"><![CDATA[suelo arenoso]]></kwd>
<kwd lng="es"><![CDATA[contenido volumétrico de agua]]></kwd>
<kwd lng="es"><![CDATA[sonda]]></kwd>
<kwd lng="es"><![CDATA[capacitancia]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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