<?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>2305-0683</journal-id>
<journal-title><![CDATA[Investigación Agraria]]></journal-title>
<abbrev-journal-title><![CDATA[Investig. Agrar.]]></abbrev-journal-title>
<issn>2305-0683</issn>
<publisher>
<publisher-name><![CDATA[Facultad de Ciencias Agrarias, UNA.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2305-06832024000100007</article-id>
<article-id pub-id-type="doi">10.18004/investig.agrar.2024.junio.2601783</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Efecto de tres tiempos de inundación en la etapa de floración de tres híbridos de maíz en Ecuador]]></article-title>
<article-title xml:lang="en"><![CDATA[Effect of three times of flooding in the flowering stage of three maize hybrids in Ecuador]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gavilánez Luna]]></surname>
<given-names><![CDATA[Freddy Carlos]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Carabalí Vargas]]></surname>
<given-names><![CDATA[Ada Anyeline]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Agraria del Ecuador Departamento de Ingeniería Agrícola ]]></institution>
<addr-line><![CDATA[Guayaquil ]]></addr-line>
<country>Ecuador</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2024</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2024</year>
</pub-date>
<volume>26</volume>
<numero>1</numero>
<fpage>7</fpage>
<lpage>13</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.iics.una.py/scielo.php?script=sci_arttext&amp;pid=S2305-06832024000100007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.iics.una.py/scielo.php?script=sci_abstract&amp;pid=S2305-06832024000100007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.iics.una.py/scielo.php?script=sci_pdf&amp;pid=S2305-06832024000100007&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN El conocimiento del tiempo de drenaje del maíz y del material vegetativo menos susceptible a la inundación son elementos importantes al momento de diseñar la infraestructura de desagüe en los campos agrícolas. Ante esto, este ensayo tuvo como objetivo evaluar el efecto de tres tiempos de saturación hídrica del suelo en tres híbridos de maíz, dentro de la etapa de floración. Se utilizó un diseño de bloques completos al azar, bajo un esquema factorial de 36 unidades experimentales y con distancia de siembra de 0,90 m x 0,25 m. Se emplearon los híbridos DK-7508, EMBLEMA y ADV9313 (niveles del Factor A); los mismos que en etapa plena de floración se inundaron durante 24, 48 y 72 horas, con un tratamiento testigo (0 horas) (niveles del factor B). Se valoró el tamaño y peso de mazorcas, índice grano/tusa, peso de 100 granos y el rendimiento de granos. Se aplicaron modelos de análisis de varianza con esquemas bi-factoriales, se realizó la prueba de Tukey en la comparación de medias para los híbridos, y ajustes de regresión por polinomios ortogonales para verificar tendencias en cuanto a los tiempos de inundación. Se establecieron diferencias significativas (p&lt;0,05) en todas las variables de acuerdo a los tiempos de inundación, con reducciones en el rendimiento de 36,80%, 18,42% y 18,73% para los híbridos DK-7508, EMBLEMA y ADV9313, respectivamente, a las 72 horas de inundación. Predominó la tendencia lineal en las variables y se determinó un tiempo de drenaje entre 29 y 48 horas para una pérdida máxima del 10%, según el híbrido evaluado.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT Knowledge of the drainage time of corn and the vegetative material less susceptible to flooding are important elements when designing drainage infrastructure in agricultural fields. Given this, this trial aimed to evaluate the effect of three times of soil water saturation in three corn hybrids, within the flowering stage. A complete randomized block design was used, under a factorial scheme of 36 experimental units and with a planting distance of 0.90 m x 0.25 m. The hybrids DK-7508, EMBLEMA and ADV9313 were used (Factor A levels); the same ones that in the full flowering stage were flooded for 24, 48 and 72 hours, also evaluating a control treatment (0 hours) (factor B levels). The size and weight of ears, grain/cob index, weight of 100 grains and yield were evaluated. Analysis of variance models with bi-factor schemes, Tukey test in the comparison of means for the hybrids and regression adjustments by orthogonal polynomials were applied to verify trends in terms of flooding times. Significant differences (p&lt;0.05) were established in all variables according to flooding times, with reductions in yield of 36.80%, 18.42% and 18.73% for the DK-7508 hybrids. EMBLEMA and ADV9313, respectively, at 72 hours of flooding. The linear trend predominated in the variables and a drainage time was determined between 29 and 48 hours for a maximum loss of 10%, depending on the hybrid evaluated.]]></p></abstract>
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<kwd lng="es"><![CDATA[cereales]]></kwd>
<kwd lng="es"><![CDATA[estrés abiótico]]></kwd>
<kwd lng="en"><![CDATA[Zea mays]]></kwd>
<kwd lng="en"><![CDATA[abiotic stress]]></kwd>
<kwd lng="en"><![CDATA[agronomic characteristics]]></kwd>
<kwd lng="en"><![CDATA[anaerobiosis]]></kwd>
<kwd lng="en"><![CDATA[cereals]]></kwd>
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