<?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>S0377-94242017000200103</article-id>
<article-id pub-id-type="doi">10.15517/rac.v41i2.31303</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Absorción de macronutrientes y eficiencia del N, en híbrido promisorio de maíz. Patricia pilar, ecuador]]></article-title>
<article-title xml:lang="en"><![CDATA[Macronutrient absorption and N uptake efficiency, in maize promising hybrid. Patricia Pilar, Ecuador]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Remache]]></surname>
<given-names><![CDATA[Manuel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Carrillo]]></surname>
<given-names><![CDATA[Manuel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mora]]></surname>
<given-names><![CDATA[Romney]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Durango]]></surname>
<given-names><![CDATA[Wuellins]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Morales]]></surname>
<given-names><![CDATA[Fátima]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Tecnológica Equinoccial  ]]></institution>
<addr-line><![CDATA[Santo Domingo ]]></addr-line>
<country>Ecuador</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Tecnológica Equinoccial  ]]></institution>
<addr-line><![CDATA[Santo Domingo ]]></addr-line>
<country>Ecuador</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Nacional de Loja  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Ecuador</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Instituto Nacional de Investigaciones Agropecuarias  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Ecuador</country>
</aff>
<aff id="Af5">
<institution><![CDATA[,Universidad Técnica de Babahoyo  ]]></institution>
<addr-line><![CDATA[Quevedo ]]></addr-line>
<country>Ecuador</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2017</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2017</year>
</pub-date>
<volume>41</volume>
<numero>2</numero>
<fpage>103</fpage>
<lpage>115</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S0377-94242017000200103&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S0377-94242017000200103&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S0377-94242017000200103&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Cuando se liberan nuevos materiales genéticos al mercado, es necesario estudiar sus requerimientos nutricionales, la dinámica de absorción de nutrientes y evaluar su rentabilidad; por lo tanto, el objetivo de esta investigación fue determinar la eficiencia de la fertilización nitrogenada y la variación en la absorción de macronutrientes por efecto de 4 dosis de nitrógeno en un híbrido promisorio de maíz, durante la época seca, en Patricia Pilar, provincia de Los Ríos, Ecuador. Se estudiaron las dosis de 0, 66, 132 y 198 kg.ha-1 de nitrógeno, por medio de un diseño de bloques completos al azar con 4 repeticiones y los promedios separados mediante la prueba de Tukey (p&lt;0,05). Las plantas se muestrearon cada 15 días, para valorar la producción de la materia seca total (MS) y la concentración de nutrientes. La eficiencia de recuperación de N se evaluó a los 110 días (madurez fisiológica) y el rendimiento del grano a los 120 días. Los resultados mostraron que para el híbrido promisorio de maíz la aplicación de 132 kg.ha-1 de N incrementó la absorción de N, P, K, Mg y S; no así para Ca. La tasa de absorción varió según el elemento; el K fue absorbido en mayor proporción en la etapa vegetativa (80%), seguido del N (50%); en tanto que el P, fue mayor (60%) en la etapa reproductiva. La absorción de Ca, Mg y S, siguió la tendencia de la producción de MS. También con dosis de 132 kg.ha-1 de N se obtuvo mayor eficiencia de recuperación de N (0,5 kg.kg-1) e incrementó la absorción de CaO y MgO (20,4 y 18,4 kg.ha-1, respectivamente). Con la aplicación de 198 kg de N.ha-1, mejoró la extracción de P2O5 (39,1 kg.ha-1), K2O (35,8 kg.ha-1) y S (3,0 kg.ha-1); además, el híbrido promisorio respondió a dosis de N mayores de 132 kg.ha-1.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract When new genetic materials are released to the market, it is necessary to study their nutrient requirements, the dynamics of nutrient absorption and evaluate their profitability; thus, the objective of this research was to determine the efficiency of nitrogen fertilization and the variation in macronutrient uptake due to 4 doses of nitrogen in a promising maize hybrid, during the dry season, in Patricia Pilar, in the province of Los Ríos, Ecuador. Nitrogen doses of 0, 66, 132 and 198 kg.ha-1 were studied in a randomized complete block design with 4 replicates and the means separated by Tukey's test (p&lt;0.05). Plants were sampled every 15 days in order to evaluate total dry matter (DM) production and nutrient concentration. N recovery efficiency was evaluated at 110 days (physiological maturity) and grain yield at 120 days. Results showed that for the promissory maize hybrid, application of 132 kg of N.ha-1 increased uptake of N, P, K, Mg and S; but not Ca. The rate of absorption varied according to the nutrient; K was absorbed to a greater extent in the vegetative stage (80%), followed by N (50%); while P absorption was higher (60%) in the reproductive stage. Absorption of Ca, Mg and S followed the trend of DM production. With N application of 132 kg.ha-1, N uptake efficiency (0.5 kg.kg-1) was higher and absorption of CaO and MgO were increased (20.4 kg.ha-1, 18,4 kg.ha-1, respectively). With application 198 kg of N.ha-1, extraction of P2O5, K2O and S were improved (39.1; 35.8 and 3.0 kg.ha-1, respectively), in addition, the promissory hybrid responded to doses of N greater than 132 kg.ha-1.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Curvas de absorción]]></kwd>
<kwd lng="es"><![CDATA[nitrógeno]]></kwd>
<kwd lng="es"><![CDATA[eficiencia de recuperación]]></kwd>
<kwd lng="es"><![CDATA[fertilización]]></kwd>
<kwd lng="es"><![CDATA[incremento de absorción]]></kwd>
<kwd lng="en"><![CDATA[Absorption curves]]></kwd>
<kwd lng="en"><![CDATA[nitrogen]]></kwd>
<kwd lng="en"><![CDATA[recovery efficiency]]></kwd>
<kwd lng="en"><![CDATA[fertilization]]></kwd>
<kwd lng="en"><![CDATA[increase of absorption]]></kwd>
</kwd-group>
</article-meta>
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