<?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>0187-7380</journal-id>
<journal-title><![CDATA[Revista fitotecnia mexicana]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. fitotec. mex]]></abbrev-journal-title>
<issn>0187-7380</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Mexicana de Fitogenética A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0187-73802022000400437</article-id>
<article-id pub-id-type="doi">10.35196/rfm.2022.4.437</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Uso eficiente de nitrógeno en aplicaciones fraccionadas de fertilizante marcado con 15N en trigo]]></article-title>
<article-title xml:lang="en"><![CDATA[Efficient use of nitrogen in split applications of 15N-labeled fertilizer in wheat]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[González-Figueroa]]></surname>
<given-names><![CDATA[Sarahyt Santamaría]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vera-Núñez]]></surname>
<given-names><![CDATA[José Antonio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Peña-Cabriales]]></surname>
<given-names><![CDATA[Juan José]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Báez-Pérez]]></surname>
<given-names><![CDATA[Aurelio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Grageda-Cabrera]]></surname>
<given-names><![CDATA[Oscar Arath]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias  ]]></institution>
<addr-line><![CDATA[Celaya Guanajuato]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Instituto Politécnico Nacional Centro de Investigación y de Estudios Avanzados ]]></institution>
<addr-line><![CDATA[Irapuato Guanajuato]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2022</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2022</year>
</pub-date>
<volume>45</volume>
<numero>4</numero>
<fpage>437</fpage>
<lpage>443</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0187-73802022000400437&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0187-73802022000400437&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0187-73802022000400437&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen La eficiencia del uso del nitrógeno (EUN) por los cultivos agrícolas es muy baja por pérdidas asociadas con su alta solubilidad y, en algunas condiciones de suelo, por alta volatilidad, lo que trae como consecuencia impactos negativos en la rentabilidad económica y la contaminación del medio ambiente. Se realizó un experimento de campo bajo riego en suelo del Bajío en Guanajuato, México para estudiar la eficiencia de asimilación del fertilizante nitrogenado por el cultivo de trigo (Triticum aestivum L.) mediante el fraccionamiento de su aplicación utilizando como trazador sulfato de amonio enriquecido con 3.0237 % de átomos en exceso de 15N. Las variedades de trigo de invierno evaluadas fueron Gema C2004, Nana F2007 y Urbina S2007; el 100 % de la dosis de fertilización fue 240 kg N ha-1 y se usaron 10 fraccionamientos en porcentaje a la siembra, encañe y espigamiento (00-00-00, 100-00-00, 00-100-00, 50-50-00, 00-50-50, 70-30-00, 30-70-00, 00-30-70, 00-70-30 y 33-33-33). El rendimiento y el porcentaje de Eficiencia del Uso del Nitrógeno (EUN) fueron mayores cuando el fertilizante N se fraccionó en 30-70-00, la EUN osciló entre el 19.68 %, cuando se fraccionó 100-00-00, y el 41.14 % cuando se fraccionó 30-70-00. Cuando no se aplicó fertilización de N en la siembra la EUN fue inferior al 25.72 %. En las prácticas locales se recomienda la fertilización 50-50-00, pero el rendimiento aumentó hasta 8.4 % y la EUN en grano hasta 8.32 % cuando el fraccionamiento fue 30-70-00. El fraccionamiento adecuado de la fertilización N es necesario para mejorar las tasas de asimilación del nitrógeno y la calidad del grano.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Summary The nitrogen use efficiency (NUE) by agricultural crops is very low due to losses associated with its high solubility and, in some soil conditions, due to high volatility, which results in negative impacts on economic profitability and environmental pollution. A field experiment was carried out under irrigation in soil of El Bajio, Guanajuato, Mexico to study the assimilation efficiency of nitrogen fertilizer by wheat (Triticum aestivum L.) by fractionating its application using ammonium sulfate enriched with 3.0237 % of atoms in excess of 15N as a tracer. The Winter wheat varieties evaluated were Gema C2004, Nana F2007 and Urbina S2007; 100% of the fertilization rate was 240 kg N ha-1 and 10 partitions in percentage were used at planting, stem elongation and heading (00-00-00, 100-00-00, 00-100-00, 50-50-00, 00-50-50, 70-30-00, 30-70-00, 00-30-70, 00-70-30 and 33-33-33). Yield and percentage of Nitrogen Use Efficiency (NUE) were higher when the N fertilizer was partitioned into 30-70-00, NUE ranged from 19.68 %, when partitioned at 100-00-00 and 41.14% when partitioned at 30-70-00. When N-fertilization was not applied at planting, the NUE was less than 25.72 %. In local practices, fertilization 50-50-00 is recommended, but yield increased up to 8.4 % and the NUE in grain up to 8.32 % when partition was 30-70-00. Proper fractionation of N-fertilization is necessary to improve nitrogen assimilation rates and grain quality.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Triticum aestivum L.]]></kwd>
<kwd lng="es"><![CDATA[manejo de N]]></kwd>
<kwd lng="es"><![CDATA[recuperación de 15N]]></kwd>
<kwd lng="es"><![CDATA[rendimiento de grano]]></kwd>
<kwd lng="en"><![CDATA[Triticum aestivum L.]]></kwd>
<kwd lng="en"><![CDATA[15N recovery]]></kwd>
<kwd lng="en"><![CDATA[grain yield]]></kwd>
<kwd lng="en"><![CDATA[N management]]></kwd>
</kwd-group>
</article-meta>
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