<?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>0120-9965</journal-id>
<journal-title><![CDATA[Agronomía Colombiana]]></journal-title>
<abbrev-journal-title><![CDATA[Agron. colomb.]]></abbrev-journal-title>
<issn>0120-9965</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional de Colombia, Facultad de Agronomía]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0120-99652017000200198</article-id>
<article-id pub-id-type="doi">10.15446/agron.colomb.v35n2.62772</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Response of radish seedlings ( Raphanus sativus L.) to different concentrations of ammoniacal nitrogen in absence and presence of silicon]]></article-title>
<article-title xml:lang="es"><![CDATA[Respuesta de las plántulas del rábano ( Raphanus sativus L.) a diferentes concentraciones de nitrógeno amoniacal en ausencia y presencia de silicio]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Olivera Viciedo]]></surname>
<given-names><![CDATA[Dilier]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[de Mello Prado]]></surname>
<given-names><![CDATA[Renato]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Lizcano Toledo]]></surname>
<given-names><![CDATA[Rodolfo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Nascimento dos Santos]]></surname>
<given-names><![CDATA[Luiz Cláudio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Peña Calzada]]></surname>
<given-names><![CDATA[Kolima]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,School of Agricultural and Veterinarian Sciences  ]]></institution>
<addr-line><![CDATA[Jaboticabal SP]]></addr-line>
<country>Brazil</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,University of Sancti Spiritus Jose Marti Perez-Uniss  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Cuba</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2017</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2017</year>
</pub-date>
<volume>35</volume>
<numero>2</numero>
<fpage>198</fpage>
<lpage>204</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0120-99652017000200198&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0120-99652017000200198&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0120-99652017000200198&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT There are unknown thresholds about the effects of ammonia toxicity in the cultivation of radish and its prejudice is higher in the root than in the aerial part, been the use of silicon an alternative to mitigate this toxicity. The objective was to evaluate the response of radish crop to different concentrations of an ammonium nutrient solution in the absence and presence of silicon under greenhouse conditions. After 30 days of germination were evaluated photosynthesis, green color index, stomatal conductance, transpiration, leaf area, tap root diameter, dry matter accumulation of nitrogen and silicon in shoot parts and roots respectively. Ammonia toxicity in radish decreased photosynthesis, transpiration, and stomatal conductance, having greater prejudice in the dry matter accumulation of root and aerial part, this effect was mitigated with the presence of silicon in the nutrient solution.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Existen dudas sobre los efectos de la toxicidad amoniacal en la fisiología del cultivo del rábano y su perjuicio es mayor en la raíz que en la parte aérea, siendo posible el uso del silicio para mitigar esa toxicidad. Para esto el objetivo fue evaluar la respuesta del cultivo del rábano en función de diferentes concentraciones de NH4+ en la solución nutritiva en ausencia y presencia de silicio. Posterior a los 30 días de la germinación se evaluaron la fotosíntesis, índice de color verde, conductancia estomática, transpiración, área foliar, diámetro de la raíz, materia seca y acúmulos de nitrógeno y silicio respectivamente en la parte aérea y las raíces de las plantas. La toxicidad amoniacal en el rábano disminuyó la fotosíntesis, la transpiración y la conductancia estomática, habiendo mayor perjuicio en el acúmulo de la materia seca de la raíz y la parte aérea, siendo mitigado este efecto con la presencia de silicio en la solución nutritiva.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[beneficial element, abiotic stress, nitrogen]]></kwd>
<kwd lng="en"><![CDATA[nutrient solution, vegetable]]></kwd>
<kwd lng="es"><![CDATA[elemento benéfico]]></kwd>
<kwd lng="es"><![CDATA[estrés abiótico]]></kwd>
<kwd lng="es"><![CDATA[solución nutritiva]]></kwd>
<kwd lng="es"><![CDATA[hortaliza]]></kwd>
</kwd-group>
</article-meta>
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