<?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>0377-9424</journal-id>
<journal-title><![CDATA[Agronomía Costarricense]]></journal-title>
<abbrev-journal-title><![CDATA[Agron. Costarricense]]></abbrev-journal-title>
<issn>0377-9424</issn>
<publisher>
<publisher-name><![CDATA[Universidad de Costa Rica. Colegio de Ingenieros y Agrónomos. Ministerio de Agricultura y Ganadería]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0377-94242020000200127</article-id>
<article-id pub-id-type="doi">10.15517/rac.v44i2.43104</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Intensidad de pastoreo y fertilización nitrogenada sobre la altura de Loliummultiflorum Lam. En un sistema de integraciónagricultura-ganadería *]]></article-title>
<article-title xml:lang="en"><![CDATA[Grazing intensity and nitrogen fertilization on the height variation of ryegrass (Lolium multiflorumLam.) in integrated crop-livestock systems.]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Beltran-Barriga]]></surname>
<given-names><![CDATA[Pablo Antonio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Corrêa-de Lima]]></surname>
<given-names><![CDATA[Rosangela]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Brugnara-Soares]]></surname>
<given-names><![CDATA[André]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Simioni-Assmann]]></surname>
<given-names><![CDATA[Tangriani]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Canaza-Cayo]]></surname>
<given-names><![CDATA[Ali William]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional del Altiplano, Facultad de Ciencias Agrarias  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Peru</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidade Tecnológica Federal do Paraná  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Brazil</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidade Tecnológica Federal do Paraná  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Brazil</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Universidade Tecnológica Federal do Paraná  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Notnormalized</country>
</aff>
<aff id="Af5">
<institution><![CDATA[,Universidad Nacional del Altiplano, Facultad de Ciencias Agrarias,  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Peru</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2020</year>
</pub-date>
<volume>44</volume>
<numero>2</numero>
<fpage>127</fpage>
<lpage>137</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S0377-94242020000200127&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S0377-94242020000200127&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S0377-94242020000200127&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN  Introducción.  La intensidad de pastoreo y la fertilización nitrogenada en sistemas integrados agricultura-ganadería (SIAG) constituyen los factores que influyen en la productividad de las pasturas y como consecuencia repercuten indirectamente sobre la producción animal.  Objetivo. El objetivo de la investigación fue evaluar el efecto de la intensidad de pastoreo y la fertilización nitrogenada sobre la altura del ryegrass(Loliummultiflorum Lam. cv. &#8216;Winter Star&#8217;)en SIAG.  Materiales y métodos.  Se utilizó un diseño bloques completamente al azar con arreglo factorial 2 x 2 x 5, con 3 repeticiones. El primer factor fue intensidad de pastoreo con 2 niveles: alta altura (AA=25 cm) y baja altura (BA=10 cm). El segundo factor fertilización nitrogenada: con nitrógeno aplicado al pasto (NP) en el invierno y N aplicado en el cultivo de granos (NG) en el verano (frijol), ambas en dosis de 200 kg.ha-1 de N. El tercer factor fue el periodo de evaluación (5 periodos). Se utilizó ryegrass italiano.  Resultados.  Se observó un leve aumento de la altura y heterogeneidad del pasto en la medida que la planta se desarrolló entre el primer y quinto periodo, en todos los tratamientos. En el tratamiento AANP, se observó mayor homogeneidad del pasto y un porcentaje mayor de las alturas (entre 10 y 25 cm), sin embargo, una menor homogeneidad con los tratamientos BANG y BANP en los que se detectó una mayor área con alturas menores al límite crítico inferior (10 cm).  Conclusión. Se concluyó que una menor intensidad de pastoreo y fertilización nitrogenada, ofrece una mayor altura de pasto ryegrassy una adecuada ganancia de peso de los animales en el SIAG.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT  Introduction. Grazing intensity and nitrogen fertilization in integrated crop-livestock system (ICLS) are factors that influence pasture productivity and, consequently, impact on livestock production.  Objective.  The objective was to evaluate the effect of grazing intensity and nitrogen fertilization on grazing height of ryegrass (Lolium multiflorum Lam. cv. 'Winter Star'), in an integrated crop-livestock system (ICLS)  Materials and methods. A completely randomized block design was used with a 2 x 2 x 5 factorial arrangement, with 3 replications. The first factor was grazing intensity with 2 levels: high height (HH = 25 cm) and low height (LH = 10 cm). The second factor was nitrogen fertilization with two levels: N (nitrogen) applied to the grass (NP) during the winter and N applied in the grain crop (NG) during the summer, both in doses of 200 kg.ha-1 of N. The third factor was the evaluation period (5 periods). Italian ryegrass was considered.  Results.  In the HHNP treatment, greater homogeneity of the grass and a higher percentage of heights (between 10 and 25 cm) were observed; however, a lower homogeneity with the treatments LHNG and LHNP in which a greater area was detected with heights lower than the lower critical limit (10 cm). Conclusion. It is concluded that a lower grazing intensity and higher nitrogen fertilization (HHNP) offers a greater height of ryegrass and an adequate weight gain in animals in an ICLS.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Pastura]]></kwd>
<kwd lng="es"><![CDATA[sistemas integrados]]></kwd>
<kwd lng="es"><![CDATA[nitrógeno]]></kwd>
<kwd lng="es"><![CDATA[pastoreo continuo]]></kwd>
<kwd lng="en"><![CDATA[Pasture]]></kwd>
<kwd lng="en"><![CDATA[integrated systems]]></kwd>
<kwd lng="en"><![CDATA[nitrogen]]></kwd>
<kwd lng="en"><![CDATA[continuous grazing]]></kwd>
</kwd-group>
</article-meta>
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<surname><![CDATA[Cadenazzi]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
<name>
<surname><![CDATA[Anghinoni]]></surname>
<given-names><![CDATA[I]]></given-names>
</name>
<name>
<surname><![CDATA[Bremm]]></surname>
<given-names><![CDATA[C]]></given-names>
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</person-group>
<source><![CDATA[Steers production in integrated crop-livestock systems: pasture management under different sward heights]]></source>
<year>2016</year>
<volume>47</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>187-94</page-range></nlm-citation>
</ref>
</ref-list>
</back>
</article>
