<?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>2664-0902</journal-id>
<journal-title><![CDATA[Alfa Revista de Investigación en Ciencias Agronómicas y Veterinaria]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. Inv. Cs. Agro. y Vet.]]></abbrev-journal-title>
<issn>2664-0902</issn>
<publisher>
<publisher-name><![CDATA[CET-BOLIVIA]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2664-09022023000100240</article-id>
<article-id pub-id-type="doi">10.33996/revistaalfa.v7i19.213</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Aplicación de nitrógeno en el cultivo de maíz en diferentes estadios fenológicos]]></article-title>
<article-title xml:lang="en"><![CDATA[Nitrogen application in the corn crop in different phenological stages]]></article-title>
<article-title xml:lang="pt"><![CDATA[Aplicação de nitrogênio na cultura de milho em diferentes estágios fenológicos]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pereira]]></surname>
<given-names><![CDATA[Wilfrido Daniel Lugo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ávalos]]></surname>
<given-names><![CDATA[Derlys Fernando López]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[González]]></surname>
<given-names><![CDATA[Laura Rocio Florencio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[López]]></surname>
<given-names><![CDATA[Eulalio Morel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Jara]]></surname>
<given-names><![CDATA[Raúl Sánchez]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Barrios]]></surname>
<given-names><![CDATA[Carlos Alberto Mongelos]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional de Concepción, Facultad de Ciencias Agrarias  ]]></institution>
<addr-line><![CDATA[Concepción ]]></addr-line>
<country>Paraguay</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>04</month>
<year>2023</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>04</month>
<year>2023</year>
</pub-date>
<volume>7</volume>
<numero>19</numero>
<fpage>240</fpage>
<lpage>254</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.bo/scielo.php?script=sci_arttext&amp;pid=S2664-09022023000100240&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.bo/scielo.php?script=sci_abstract&amp;pid=S2664-09022023000100240&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.bo/scielo.php?script=sci_pdf&amp;pid=S2664-09022023000100240&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN El cultivo del maíz tiene mucha importancia en Paraguay, siendo principal rubro de los productores de la zona, por esta razón es necesario la aplicación de fertilizante nitrogenado para incrementar la producción, además la importancia del momento de la aplicación. El objetivo del trabajo fue evaluar la aplicación de nitrógeno en diferentes estadios fenológicos en el cultivo de maíz. El experimento se realizó en Santa Elena, Distrito de Belén, Departamento de Concepción, Paraguay. El experimento realizado se utilizó un diseño de bloques completos al azar (DBCA), con esquema factorial (4 x 4), donde el factor A correspondió a dosis de nitrógeno (0, 35, 70 y 105 kg ha-1) y factor B momento de aplicación en estados fenológicos (V1, V3, V6 y V9), con tres repeticiones. Los datos obtenidos fueron evaluados estadísticamente por el Test F y las medias fueron comparadas por el test de Tukey al 5 %, además se realizó el análisis de regresión. Las determinaciones evaluadas fueron la altura de planta, altura de inserción de la mazorca, longitud de la mazorca, diámetro de la mazorca y el rendimiento de granos del maíz. El resultado de análisis en la altura de planta y altura de inserción de mazorca mostró significancia en la dosis de nitrógeno, las otras determinaciones se observaron interacciones entre los factores y se ajustaron a una ecuación cuadrática. La combinación de las dosis de N con diferentes estados fenológicos aumenta de manera significativa el rendimiento del maíz.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT The cultivation of corn is very important in Paraguay, being the main item of producers in the area, for this reason it is necessary to apply nitrogen fertilizer to increase production, as well as the importance of the moment of application. The objective of the work was to evaluate the application of nitrogen in different phenological stages in the corn crop. The experiment was carried out in Santa Elena, District of Belén, Department of Concepción, Paraguay. The experiment carried out used a randomized complete block design (DBCA), with a factorial scheme (4 x 4), where factor A corresponded to nitrogen doses (0, 35, 70 and 105 kg ha-1) and factor B moment of application in phenological stages (V1, V3, V6 and V9), with three repetitions. The data obtained were statistically evaluated by the F Test and the means were compared by the Tukey test at 5%, in addition the regression analysis was performed. The evaluated determinations were plant height, ear insertion height, ear length, ear diameter and corn grain yield. The result of the analysis in plant height and ear insertion height showed significance in the nitrogen dose, the other determinations were observed interactions between the factors and were adjusted to a quadratic equation. The combination of N doses with different phenological stages significantly increases maize yield.]]></p></abstract>
<abstract abstract-type="short" xml:lang="pt"><p><![CDATA[RESUMO O cultivo do milho é muito importante no Paraguai, sendo o principal item dos produtores da região, por isso é necessário aplicar adubação nitrogenada para aumentar a produção, bem como a importância do momento da aplicação. O objetivo do trabalho foi avaliar a aplicação de nitrogênio em diferentes estádios fenológicos na cultura do milho. O experimento foi realizado em Santa Elena, Distrito de Belén, Departamento de Concepción, Paraguai. O experimento utilizado foi o delineamento em blocos ao acaso (DBCA), em esquema fatorial (4x4), onde o fator A correspondeu às doses de nitrogênio (0, 35, 70 e 105 kg ha-1) e o fator B, momento de aplicação em estádios fenológicos (V1, V3, V6 e V9), com três repetições. Os dados obtidos foram avaliados estatisticamente pelo Teste F e as médias comparadas pelo teste de Tukey a 5%, além disso foi realizada a análise de regressão. As determinações avaliadas foram altura de planta, altura de inserção de espiga, comprimento de espiga, diâmetro de espiga e rendimento de grãos de milho. O resultado da análise em altura de planta e altura de inserção da espiga mostrou significância na dose de nitrogênio, nas demais determinações foram observadas interações entre os fatores e foram ajustadas a uma equação quadrática. A combinação de doses de N com diferentes estádios fenológicos aumenta significativamente a produtividade do milho.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Maíz]]></kwd>
<kwd lng="es"><![CDATA[Nitrógeno]]></kwd>
<kwd lng="es"><![CDATA[Rendimiento]]></kwd>
<kwd lng="en"><![CDATA[Corn]]></kwd>
<kwd lng="en"><![CDATA[Nitrogen]]></kwd>
<kwd lng="en"><![CDATA[Yield]]></kwd>
<kwd lng="pt"><![CDATA[Milho]]></kwd>
<kwd lng="pt"><![CDATA[Nitrogênio]]></kwd>
<kwd lng="pt"><![CDATA[Produtividade]]></kwd>
</kwd-group>
</article-meta>
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