<?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>1405-3195</journal-id>
<journal-title><![CDATA[Agrociencia]]></journal-title>
<abbrev-journal-title><![CDATA[Agrociencia]]></abbrev-journal-title>
<issn>1405-3195</issn>
<publisher>
<publisher-name><![CDATA[Colegio de Postgraduados]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1405-31952016000600711</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Biomasa de Urochloa brizantha cv. Toledo como materia prima para la producción de bioetanol]]></article-title>
<article-title xml:lang="en"><![CDATA[Biomass of Urochloa brizantha cv. Toledo as raw material for bioethanol production]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Santiago-Ortega]]></surname>
<given-names><![CDATA[Mario A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Honorato-Salazar]]></surname>
<given-names><![CDATA[José A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Quero-Carrillo]]></surname>
<given-names><![CDATA[Adrián R.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hernández-Garay]]></surname>
<given-names><![CDATA[Alfonso]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[López Castañeda]]></surname>
<given-names><![CDATA[Cándido]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[López-Guerrero]]></surname>
<given-names><![CDATA[Isaías]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Colegio de Postgraduados  ]]></institution>
<addr-line><![CDATA[Montecillo, Texcoco Estado de México]]></addr-line>
<country>México</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias  ]]></institution>
<addr-line><![CDATA[ Puebla]]></addr-line>
<country>México</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias  ]]></institution>
<addr-line><![CDATA[ Veracruz]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>09</month>
<year>2016</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>09</month>
<year>2016</year>
</pub-date>
<volume>50</volume>
<numero>6</numero>
<fpage>711</fpage>
<lpage>726</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-31952016000600711&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-31952016000600711&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-31952016000600711&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen La evaluación de pastos de crecimiento rápido y rendimiento alto de biomasa ha aumentado en el mundo porque son cultivos energéticos potenciales para producir bioetanol de segunda generación. En México se inician estudios en pastos con producción alta de biomasa para usarlos en la producción de biocombustibles. El objetivo de este estudio fue evaluar la biomasa de Urochloa brizantha cv. Toledo, como materia prima para la producción de bioetanol. La producción anual de biomasa, el poder calorífico, la composición química, el análisis inmediato y el rendimiento teórico de bioetanol se determinaron en seis frecuencias de corte (30, 60, 90, 120, 150 y 180 d después del rebrote). Los datos se analizaron mediante el procedimiento GLM (SAS) y las medias de los tratamientos se compararon con la prueba de Tukey (p&#8804;0.05). El contenido mayor de hemicelulosas y celulosa (p&#8804;0.05) fue 30.1 y 44.1 % a los 60 y 150 d del corte. El contenido menor de lignina (p&#8804;0.05) fue 16.2 % a los 60 d del corte. El contenido mayor de cenizas y proteína (p&#8804;0.05) fue 9 y 8%,y a los 30 d del corte. El poder calorífico no difirió entre frecuencias de corte (p&#8804;0.05). Con 180 d de frecuencia de corte se acumuló cantidad mayor (p&#8804;0.05) de biomasa (27.95 Mg ha-1 año-1), el porcentaje mayor de holocelulosa (73.6 %) y el rendimiento mayor de bioetanol (281.3 L Mg materia seca). Las características químicas y el rendimiento de biomasa destacan el potencial de U. brizantha para producir bioetanol en áreas tropicales.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Evaluation of fast-growing and high biomass-yieldinggrasses has increased worldwide because they are potential energy crops for the production of second-generation bioethanol. In Mexico, studies on high biomass-producing grasses have begun with the aim of using them for biofuel production. The objective of this study was to evaluate the biomass of Urochloa brizantha cv. Toledo as raw material for bioethanol production. Yearly biomass production, calorific power, chemical composition, immediate analysis and theoretical bioethanol yield were determined for six cutting frequencies (30, 60, 90, 120, 150 and 180 d after regrowth). The data were analyzed with GLM (SAS) and treatments means were compared with the Tukey test (p&#8804;0.05). The highest content of hemicellulose and cellulose (p&#8804;0.05) was 30.1 and 44.1 % at the frequencies of 60 and 150 d. The lowest content of lignin (p&#8804;0.05) was 16.2 % at 60 d. The highest contents of ash and protein (p&#8804;0.05) was 9 and 8 % at 30-d. Calorific power did not differ (p&#8804;0.05) between cuttings. With 180 days cutting frequency, the highest quantity (p&#8804;0.05) of biomass (27.95 Mg ha-1 year-1), the largest percentage of holocellulose (73.6 %) and the highest yield of bioethanol (281.3 L Mg dry matter) accumulated. The chemical characteristics and yield of biomass underline the potential of U. brizantha for production of bioethanol in tropical areas.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Urochloa brizantha]]></kwd>
<kwd lng="es"><![CDATA[bioetanol]]></kwd>
<kwd lng="es"><![CDATA[composición química]]></kwd>
<kwd lng="es"><![CDATA[análisis inmediato]]></kwd>
<kwd lng="es"><![CDATA[poder calorífico]]></kwd>
<kwd lng="en"><![CDATA[Urochloa brizantha]]></kwd>
<kwd lng="en"><![CDATA[bioethanol]]></kwd>
<kwd lng="en"><![CDATA[chemical composition]]></kwd>
<kwd lng="en"><![CDATA[immediate analysis]]></kwd>
<kwd lng="en"><![CDATA[calorific power]]></kwd>
</kwd-group>
</article-meta>
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