<?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>0187-5779</journal-id>
<journal-title><![CDATA[Terra Latinoamericana]]></journal-title>
<abbrev-journal-title><![CDATA[Terra Latinoam]]></abbrev-journal-title>
<issn>0187-5779</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Mexicana de la Ciencia del Suelo A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0187-57792014000100023</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Efecto del sistema de riego y clima en la eficiencia del uso de agua de nogal pecanero]]></article-title>
<article-title xml:lang="en"><![CDATA[Effect of irrigation system and climate on water use efficiency of pecan trees]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Zermeño González]]></surname>
<given-names><![CDATA[Alejandro]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cruz Santes]]></surname>
<given-names><![CDATA[Claudia Ivette]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Munguía López]]></surname>
<given-names><![CDATA[Juan Plutarco]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Catalán Valencia]]></surname>
<given-names><![CDATA[Ernesto Alonso]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Campos Magaña]]></surname>
<given-names><![CDATA[Santos Gabriel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cortés Bracho]]></surname>
<given-names><![CDATA[Javier de Jesús]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Autónoma Agraria Antonio Narro Departamento de Riego y Drenaje ]]></institution>
<addr-line><![CDATA[Saltillo Coahuila]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Centro de Investigación en Química Aplicada  ]]></institution>
<addr-line><![CDATA[Saltillo Coahuila]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias CENID RASPA]]></institution>
<addr-line><![CDATA[Gómez Palacio Durango]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Universidad Autónoma Agraria Antonio Narro Departamento de Maquinaria Agrícola ]]></institution>
<addr-line><![CDATA[Saltillo Coahuila]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>03</month>
<year>2014</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>03</month>
<year>2014</year>
</pub-date>
<volume>32</volume>
<numero>1</numero>
<fpage>23</fpage>
<lpage>33</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0187-57792014000100023&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0187-57792014000100023&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0187-57792014000100023&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: El nogal pecanero (Carya illinoensis K.) es una especie frutícola de gran importancia para México, su cultivo se realiza en regiones de clima semidesértico donde el agua es el factor limitante de la producción, por lo que es necesario obtener la máxima eficiencia del uso de este recurso, que es función del sistema de riego y de las condiciones climáticas de la región. Sobre esta base, el objetivo de este estudio fue evaluar la eficiencia del uso del agua de dos huertas de nogal pecanero bajo dos sistemas de riego y diferentes condiciones climáticas. El estudio se realizó en el verano de 2008, en dos huertas de nogal pecanero del noreste de México: una de ellas ubicada en el sureste del estado de Coahuila (Mieleras, municipio de Matamoros) con riego por goteo subsuperficial, y la otra en el norte del mismo estado (Zaragoza) regada con aspersión. La eficiencia del uso del agua de las huertas del nogal pecanero se definió como la relación entre moles de CO2 asimilados por mol de agua evapotranspirada por el dosel de los árboles. Los resultados del estudio mostraron que aunque la asimilación de CO2 promedio diurna en la huerta de Mieleras (441.68 mmol m-2) fue estadísticamente igual a la observada en la huerta de Zaragoza (489.04 mmol m-2); la eficiencia promedio diaria del uso del agua (mmol CO2 mol-1 H2O) fue mayor (P &#8804; 0.05) en la huerta de Zaragoza (1.82) que la que se obtuvo en la huerta de Mieleras (1.42). Esto se debió a que las condiciones climáticas en Matamoros fueron de un mayor déficit de presión de vapor y una mayor tasa de evapotranspiración, que tuvieron un efecto mayor en la eficiencia del uso del agua que el sistema de riego utilizado en cada huerta.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: Pecan (Carya illinoensis K.) is an important fruit tree for Mexico. It is grown in arid regions were water availability is the limiting factor for its production. Therefore, it is necessary to obtain the highest possible water use efficiency, which is a function of the irrigation method and the climate conditions of the region. Thus, the objective of this study was to evaluate the water use efficiency of two pecan orchards, with different methods of irrigation and different climate conditions. The study was done during the summer of 2008 in two pecan orchards in northeastern Mexico. One of them is located in southeastern Coahuila (Mieleras, Municipality of Matamoros) irrigated with a subsurface drip irrigation system. The other in northern Coahuila (Zaragoza) has a sprinkler irrigation system. Water use efficiency of the two orchards was defined as the ratio between moles of CO2 absorbed and moles of water vapor evapotranspired by the tree canopies. The results of this study showed that, although average daily CO2 assimilation rate of the Mieleras orchard (441.68 mmol m-2) was statistically equal to that observed in the Zaragoza orchard (489.04 mmol m-2), the average daily intrinsic water use efficiency (mmol CO2 mol-1 H2O) was higher (P &#8804; 0.05) in the Zaragoza orchard (1.82) than that in the Mieleras orchard (1.42). This was due to the climate conditions of Mieleras that caused a higher water vapor pressure deficit and a higher evapotranspiration rate, whose effect on water use efficiency was greater than the effect of the irrigation system used.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[riego por goteo subsuperficial]]></kwd>
<kwd lng="es"><![CDATA[riego por aspersión]]></kwd>
<kwd lng="es"><![CDATA[CO2 asimilado]]></kwd>
<kwd lng="es"><![CDATA[H2O evapotranspirada]]></kwd>
<kwd lng="en"><![CDATA[subsurface drip irrigation]]></kwd>
<kwd lng="en"><![CDATA[sprinkler irrigation]]></kwd>
<kwd lng="en"><![CDATA[absorbed CO2]]></kwd>
<kwd lng="en"><![CDATA[evapotranspired water vapor]]></kwd>
</kwd-group>
</article-meta>
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