<?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>0864-0394</journal-id>
<journal-title><![CDATA[Pastos y Forrajes]]></journal-title>
<abbrev-journal-title><![CDATA[Pastos y Forrajes]]></abbrev-journal-title>
<issn>0864-0394</issn>
<publisher>
<publisher-name><![CDATA[Estación Experimental de Pastos y Forrajes Indio Hatuey]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0864-03942021000100005</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Efecto de la fertilización nitrogenada en el crecimiento de cinco pastos perennes en Ecuador]]></article-title>
<article-title xml:lang="en"><![CDATA[Effect of nitrogen fertilization on the growth of five perennial pastures in Ecuador]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Benalcázar-Carranza]]></surname>
<given-names><![CDATA[Brenda Pamela]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[López-Caiza]]></surname>
<given-names><![CDATA[Vanessa Carolina]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gutiérrez-León]]></surname>
<given-names><![CDATA[Francisco Adolfo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Alvarado-Ochoa]]></surname>
<given-names><![CDATA[Soraya]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Portilla-Narváez]]></surname>
<given-names><![CDATA[Arnulfo Rigoberto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Central del Ecuador  ]]></institution>
<addr-line><![CDATA[Avenida Universitaria. Quito ]]></addr-line>
<country>Ecuador</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2021</year>
</pub-date>
<volume>44</volume>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_arttext&amp;pid=S0864-03942021000100005&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_abstract&amp;pid=S0864-03942021000100005&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_pdf&amp;pid=S0864-03942021000100005&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN  Objetivo :Evaluar el efecto de la fertilización nitrogenada en el crecimiento y el contenido de proteína bruta de cinco pastos perennes en Ecuador.  Materiales y Métodos : Para evaluar el efecto de la fertilización nitrogenada en el crecimiento y el contenido de proteína bruta de las especies Lolium perenne L. var. Alto, Lolium perenne x Lolium multiflorum var. Shogun, Festuca arundinacea Schreb var. Alta Barolex, Dactylis glomerata L. var. Quick Draw y Festuca arundinacea x Lolium multiflorum var. Premium, se aplicaron seis dosis progresivas de nitrógeno (0, 70, 140, 210, 280 y 350 kg de N ha-1 año-1). Se utilizó un diseño de parcelas dividas, donde se ubicó la especie en la parcela grande, y las dosis de nitrógeno en las pequeñas, con tres repeticiones. Se evaluaron las variables producción de biomasa, proteína bruta e índice de vegetación diferencial normalizado. Los datos se analizaron mediante el programa estadístico INFOSTAT®.  Resultados : La producción de biomasa indicó diferencias estadísticamente significativas (p &lt; 0,05) para los factores en estudio especies y dosis de nitrógeno, pero no para la interacción de dichos factores. D. glomerata y F. arundinacea presentaron los valores de producción de biomasa más bajos (2 457 y 2 490 kg de MS ha-1), comparados con L. perenne, que tuvo un rendimiento intermedio. F. arundinacea x L. multiflorum y L. perenne x L. multiflorum alcanzaron los valores más altos de biomasa (3 407 y 3 364 kg de MS ha-1). El contenido de proteína bruta también aumentó con las dosis de nitrógeno. A su vez, el índice de vegetación diferencial normalizado se incrementó, también de acuerdo a un modelo cuadrático, con una respuesta diferente entre especies.  Conclusiones : Todas las especies respondieron positivamente a las dosis de aplicación de nitrógeno. Se determinó que existe incremento en la producción de biomasa, contenido de proteína bruta y el índice de vegetación diferencial normalizado.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT  Objective : To evaluate the effect of nitrogen fertilization on the growth and crude protein content of five perennial pastures of Ecuador.  Materials and Methods : To evaluate the effect of nitrogen fertilization on the growth and crude protein content of the species Lolium perenne L. var. Alto, Lolium perenne x Lolium multiflorum var. Shogun, Festuca arundinacea Schreb var. Alta Barolex, Dactylis glomerata L. var. Quick Draw and Festuca arundinacea x Lolium multiflorum var. Premium, six progressive doses of nitrogen were applied (0, 70, 140, 210, 280 and 350 kg N ha-1 year-1). A split-plot design was used, where the species was placed in the large plot, and the nitrogen doses, in the small ones, with three repetitions. The variables biomass production, crude protein and normalized differential vegetation index, were evaluated. The data were analyzed through the statistical program INFOSTAT®.  Results : The biomass production indicated statistically significant differences (p &lt; 0,05) for the studied factors species and nitrogen doses, but not for the interaction of such factors. D. glomerata and F. arundinacea showed the lowest biomass production values (2 457 and 2 490 kg DM ha-1), compared with L. perenne, which had a moderate yield. F. arundinacea x L. multiflorum and L. perenne x L. multiflorum reached the highest biomass values (3 407 and 3 364 kg DM ha-1). The crude protein content also increased with the nitrogen doses. In turn, the normalized differential vegetation index increased, also according to a quadratic model, with a different response among species.  Conclusions : All the species responded positively to the nitrogen application doses. It was determined that there is increase in the biomass production, crude protein content and normalized differential vegetation index.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[producción]]></kwd>
<kwd lng="es"><![CDATA[ganadería]]></kwd>
<kwd lng="es"><![CDATA[índices de vegetación]]></kwd>
<kwd lng="en"><![CDATA[production]]></kwd>
<kwd lng="en"><![CDATA[animal husbandry]]></kwd>
<kwd lng="en"><![CDATA[vegetation indexes]]></kwd>
</kwd-group>
</article-meta>
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