<?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>2409-8752</journal-id>
<journal-title><![CDATA[Revista Científica de la UCSA]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. ciente. UCSA]]></abbrev-journal-title>
<issn>2409-8752</issn>
<publisher>
<publisher-name><![CDATA[Universidad del Cono Sur de las Américas]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2409-87522025000100014</article-id>
<article-id pub-id-type="doi">10.18004/ucsa/2409-8752/2025.012.01.014</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Fertilización nitrogenada y fosfórica en yerba mate (Ilex paraguariensis st. hil.) en el Distrito de Paso Yobay, Departamento del Guairá]]></article-title>
<article-title xml:lang="en"><![CDATA[Nitrogen and phosphorus fertilization in yerba mate (Ilex paraguariensis st. hil.) in the district of Paso Yobay, Department of Guairá]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Arzamendia Arguello]]></surname>
<given-names><![CDATA[Sandra]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rasche Alvarez]]></surname>
<given-names><![CDATA[Jimmy Walter]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Fatecha Fois]]></surname>
<given-names><![CDATA[Diego Augusto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ferreira Gomez]]></surname>
<given-names><![CDATA[Anahi]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional del Este Facultad de Ingeniería Agronómica ]]></institution>
<addr-line><![CDATA[Minga Guazu ]]></addr-line>
<country>Paraguay</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional de Asunción  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Paraguay</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidade Federal Do Rio Grande do Sul Programa de Pós-graduação em Ciência do Solo ]]></institution>
<addr-line><![CDATA[Porto Alegre ]]></addr-line>
<country>Brazil</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>04</month>
<year>2025</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>04</month>
<year>2025</year>
</pub-date>
<volume>12</volume>
<numero>1</numero>
<fpage>14</fpage>
<lpage>23</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.iics.una.py/scielo.php?script=sci_arttext&amp;pid=S2409-87522025000100014&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.iics.una.py/scielo.php?script=sci_abstract&amp;pid=S2409-87522025000100014&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.iics.una.py/scielo.php?script=sci_pdf&amp;pid=S2409-87522025000100014&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN La yerba mate es una planta perenne de cosecha anual, del cual las hojas y las ramas finas, son retiradas de la planta y consideradas como producción comercial, donde la provisión de nitrógeno y fósforo resultan fundamentales para una producción económicamente rentable. Con el objetivo de evaluar el efecto de dosis de nitrógeno y fósforo sobre la concentración de nitrógeno y fósforo en la planta y producción yerba mate se instaló un experimento en la localidad de Mangrullo, Paso Yobai, Guairá entre los meses de agosto de 2018 a julio de 2019. El diseño experimental fue de bloques completos al azar, en un esquema bifactorial, donde el factor 1 correspondió a dosis de N (0, 60 y 120 kg ha-1 de N) y el factor 2, dosis de fósforo (0, 60 y 120 kg ha-1 de P2O5), con tres repeticiones. Las variables evaluadas fueron el contenido de nitrógeno, fósforo en hojas y ramas finas y rendimiento comercial de la yerba mate (kg ha-1). Los datos fueron sometidos a test de normalidad y posteriormente a análisis de varianza y comparación de medias mediante prueba de Tukey al 5% de probabilidad de error y análisis de regresión. Los resultados analizados indican diferencias significativas en la variable de concentración de N en ramas finas, los tratamientos con 60 y 120 kg ha-1 de nitrógeno presentaron 15,54 y 16,36 g kg-1 respectivamente, fueron superior al tratamiento testigo que presentó 11,1 g kg-1. Las demás variables fueron estadísticamente similares, con valores promedios de nitrógeno en hojas de 30,31 g kg-1, fósforo en hojas de 1,05 g kg-1, fósforo en ramas finas de 0,77 g kg-1. El rendimiento promedio fue de 7866 kg ha-1. La aplicación de dosis crecientes de N y P no influenciaron en la producción de yerba mate en el primer año de evaluación.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT Yerba mate is a perennial plant harvested annually, from which the leaves and fine branches are removed from the plant and considered as commercial production, where the provision of nitrogen and phosphorus are essential for an economically profitable production. In order to evaluate the effect of nitrogen and phosphorus doses on the concentration of itrogen and phosphorus in the plant and yerba mate production, an experiment was set up in the town of Mangrullo, Paso Yobai, Guairá between the months of August 2018 and July 2019. The experimental design was a randomized complete block, in a bifactorial scheme, where factor 1 corresponded to N doses (0, 60 and 120 kg ha-1 of N) and factor 2, phosphorus doses (0, 60 and 120 kg ha-1 of P2O5), with three repetitions. The variables evaluated were the nitrogen and phosphorus content in leaves and thin branches and commercial yield of yerba mate (kg ha-1). The data were subjected to a normality test and subsequently to variance analysis and comparison of means using the Tukey test at 5% probability of error and regression analysis. The results analyzed indicate significant differences in the variable of N concentration in thin branches; the treatments with 60 and 120 kg ha-1 of nitrogen presented 15.54 and 16.36 g kg-1 respectively, were higher to the control treatment which presented 11.1 g kg-1. The other variables were statistically similar, with average values of nitrogen in leaves of 30.31 g kg-1, phosphorus in leaves of 1.05 g kg-1, phosphorus in thin branches of 0.77 g kg-1. The average yield was 7866 kg ha-1. The application of increasing doses of N and P did not influence yerba mate production in the first year of evaluation.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[nitrógeno]]></kwd>
<kwd lng="es"><![CDATA[fósforo]]></kwd>
<kwd lng="es"><![CDATA[fertilización química]]></kwd>
<kwd lng="es"><![CDATA[producción de hojas]]></kwd>
<kwd lng="en"><![CDATA[Nitrogen]]></kwd>
<kwd lng="en"><![CDATA[Phosporous]]></kwd>
<kwd lng="en"><![CDATA[Chemical fertilization]]></kwd>
<kwd lng="en"><![CDATA[leaf production]]></kwd>
</kwd-group>
</article-meta>
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