<?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>2007-4026</journal-id>
<journal-title><![CDATA[Ingeniería agrícola y biosistemas]]></journal-title>
<abbrev-journal-title><![CDATA[Ing. agric. biosist.]]></abbrev-journal-title>
<issn>2007-4026</issn>
<publisher>
<publisher-name><![CDATA[Universidad Autónoma Chapingo]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2007-40262021000100095</article-id>
<article-id pub-id-type="doi">10.5154/r.inagbi.2021.02.035</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Spatio-temporal variation of reference evapotranspiration from empirical methods in Chihuahua, Mexico]]></article-title>
<article-title xml:lang="es"><![CDATA[Variación espacio-temporal de la evapotranspiración de referencia a partir de métodos empíricos en Chihuahua, México]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Villa-Camacho]]></surname>
<given-names><![CDATA[Augusto Omar]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ontiveros-Capurata]]></surname>
<given-names><![CDATA[Ronald Ernesto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ruíz-Álvarez]]></surname>
<given-names><![CDATA[Osías]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[González-Sánchez]]></surname>
<given-names><![CDATA[Alberto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Quevedo-Tiznado]]></surname>
<given-names><![CDATA[José Antonio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ordoñez-Hernández]]></surname>
<given-names><![CDATA[Laura Maleni]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Benemérita Universidad Autónoma de Puebla Facultad de Ingeniería Agrohidráulica ]]></institution>
<addr-line><![CDATA[Teziutlán Puebla]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Instituto Mexicano de Tecnología del Agua  ]]></institution>
<addr-line><![CDATA[Jiutepec Morelos]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias Campo Experimental Centro de Chiapas ]]></institution>
<addr-line><![CDATA[Ocozocoautla Chiapas]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2021</year>
</pub-date>
<volume>13</volume>
<numero>1</numero>
<fpage>95</fpage>
<lpage>115</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-40262021000100095&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-40262021000100095&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-40262021000100095&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Introduction: Evapotranspiration is key in the management of arid agricultural areas. In Chihuahua, the volume of irrigation water is based on reference evapotranspiration (ETo) calculated with empirical methods and extrapolated to the cropped area, which is inaccurate. The alternative is to calculate ETo variation by spatial interpolation.  Objective: To analyze the spatio-temporal variation of ETo using empirical methods and spatial interpolation in Chihuahua, Mexico.  Methodology:  Records from 33 meteorological stations from 1960-2013 and seven ETo estimation methods were used. The results were compared with the Penman-Monteith method, modified by FAO (PMMF), ANOVA analysis (P &#8804; 0.05), and homogeneous ETo surfaces built from the point values by spatial interpolation.  Results: The Hargreaves method (R2 = 0.91, RMSE = 1.16 and ME = -0.69 mm-day-1) had a smaller bias with respect to PMMF. ETo values ranged from 2.5 to 7.1 mm-day-1 in a west-east direction, with maximum values at low elevations and minimum values at high elevations, which showed the influence of the Sierra Madre Occidental on ETo. This characteristic was most noticeable in the warm months (June to September).  Limitations of the study: The use of estimated data needs field validation.  Originality: The ETo estimation with seven empirical methods and one spatial interpolation method to extrapolate values to areas with scarce meteorological data.  Conclusions:  The Hargreaves method allows estimating the spatio-temporal variation of ETo in large extensions and areas with limited meteorological information.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Introducción: La evapotranspiración es clave en la gestión de zonas agrícolas áridas. En Chihuahua, el volumen de agua de riego se asigna a partir de la evapotranspiración de referencia (ETo) calculada con métodos empíricos y extrapolada a la superficie agrícola, lo que es inexacto. La alternativa es calcular la variabilidad de la ETo mediante interpolación espacial.  Objetivo: Analizar la variabilidad espacio-temporal de ETo a partir de métodos empíricos e interpolación espacial en Chihuahua, México.  Metodología:  Se utilizaron registros de 33 estaciones meteorológicas del periodo 1960-2013 y siete métodos de estimación de la ETo. Los resultados se compararon con el método Penman-Monteith, modificado por la FAO (PMMF), mediante un análisis ANOVA (P &#8804; 0.05), y se elaboraron superficies homogéneas de la ETo a partir de los valores puntuales mediante interpolación espacial.  Resultados: El método Hargreaves (R2 = 0.91, CME = 1.16 y EM = -0.69 mm·día-1) presentó un menor sesgo respecto a PMMF. Los valores de ETo oscilaron de 2.5 a 7.1 mm·día-1 en dirección oeste-este, con valores máximos en zonas bajas y mínimos en altas, lo que mostró la influencia de la sierra madre occidental en la ETo. Dicha característica resaltó en los meses cálidos (junio a septiembre).  Limitaciones del estudio: El uso de datos estimados requiere validación en campo.  Originalidad: Estimación de la ETo con siete métodos empíricos y uno de interpolación espacial para extrapolar valores a zonas con datos escasos.  Conclusiones:  El método Hargreaves permite estimar la variabilidad espacio-temporal de la ETo en grandes extensiones y zonas con información meteorológica limitada.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[water requirements]]></kwd>
<kwd lng="en"><![CDATA[Hargreaves]]></kwd>
<kwd lng="en"><![CDATA[modified Penman-Monteith]]></kwd>
<kwd lng="en"><![CDATA[semi-arid]]></kwd>
<kwd lng="en"><![CDATA[spatial interpolation]]></kwd>
<kwd lng="es"><![CDATA[requerimientos hídricos]]></kwd>
<kwd lng="es"><![CDATA[Hargreaves]]></kwd>
<kwd lng="es"><![CDATA[Penman-Monteith modificado]]></kwd>
<kwd lng="es"><![CDATA[semi-árido]]></kwd>
<kwd lng="es"><![CDATA[interpolación espacial]]></kwd>
</kwd-group>
</article-meta>
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