<?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>0187-7380</journal-id>
<journal-title><![CDATA[Revista fitotecnia mexicana]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. fitotec. mex]]></abbrev-journal-title>
<issn>0187-7380</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Mexicana de Fitogenética A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0187-73802022000300349</article-id>
<article-id pub-id-type="doi">10.35196/rfm.2022.3.349</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Efectos de luz suplementaria aplicada en plántulas de tomate]]></article-title>
<article-title xml:lang="en"><![CDATA[Effects of supplementary light applied in tomato seedlings]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Moreno-Pérez]]></surname>
<given-names><![CDATA[Esaú del Carmen]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sánchez-Del Castillo]]></surname>
<given-names><![CDATA[Felipe]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Portillo-Márquez]]></surname>
<given-names><![CDATA[Lázaro]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vázquez-Rodríguez]]></surname>
<given-names><![CDATA[José Cutberto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Autónoma Chapingo Departamento de Fitotecnia ]]></institution>
<addr-line><![CDATA[Texcoco Estado de México]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>09</month>
<year>2022</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>09</month>
<year>2022</year>
</pub-date>
<volume>45</volume>
<numero>3</numero>
<fpage>349</fpage>
<lpage>357</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0187-73802022000300349&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0187-73802022000300349&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0187-73802022000300349&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen En la Universidad Autónoma Chapingo se ha trabajado en el desarrollo de un sistema especial de producción de tomate en invernadero capaz de acortar el ciclo de cultivo de trasplante a fin de la cosecha a menos de 90 días y así lograr hasta cuatro ciclos de producción por año. Este sistema implica prolongar la edad al trasplante hasta los 60 días después de la siembra (dds) y despuntar las plantas por encima de la tercera inflorescencia. El objetivo de la presente investigación fue evaluar los efectos de la aplicación de luz suplementaria sobre plántulas de tomate creciendo en charolas con cavidades de 250 cm3 sobre aspectos morfológicos que ayuden a prolongar la edad al trasplante hasta los 60 dds sin efectos negativos posteriores en el rendimiento de las plantas. Se compararon 10 tratamientos que resultaron de la combinación de tres ubicaciones de lámparas de luz (arriba, abajo y en ambas posiciones del dosel) y de tres periodos de aplicación (diurno, nocturno y diurno más nocturno), más un testigo sin aplicación. La luz suplementaria se suministró con lámparas LED de luz blanca fría con un flujo fotónico fotosintético de 100 &#956;mol m-2 s-1 a 20 cm de distancia. Se empleó un diseño experimental de bloques completos al azar con cuatro repeticiones y un arreglo factorial de tratamientos, usando un grupo de 16 plántulas como unidad experimental. Se encontró que la luz suplementaria, aplicada durante el día y desde el interior del dosel, redujo la altura y área foliar de las plántulas, pero no incrementó el número de flores ni el rendimiento por planta con respecto al testigo. Con el trasplante a los 60 dds el cultivo en el invernadero duró sólo 85 días, lo que hace posible establecer cuatro ciclos de producción al año e incrementar el rendimiento con respecto a otros sistemas intensivos de producción de tomate en invernadero.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Summary At Chapingo Autonomous University research has been done to develop a special greenhouse tomato production system capable of shortening the crop cycle from transplant to final harvest to less than 90 days; thus, achieving up to four production cycles per year. This system implies to delay the transplant age until 60 days after sowing (das) and decapitation of plants just above the third inflorescence. The objective of this study was to evaluate the effects of the application of supplementary light on tomato seedlings growing in trays with cavities of 250 cm3 on morphological traits that help to delay the transplant age until 60 das without subsequent negative effects on plant yield. Ten treatments that resulted from the combination of three light lamps locations (top, bottom and in both canopy positions) and three application periods (day, night and day plus night), plus a control without application were compared. Supplemental light was supplied with cool white-light LED lamps with a photosynthetic photon flux of 100 &#956;mol m-2 s-1 at a distance of 20 cm. A randomized complete block design with four replications was used with a factorial arrangement of treatments, using a group of 16 seedlings as the experimental unit. It was found that supplementary light, applied during the day and from inside the canopy, reduced plant height and leaf area of seedlings, but did not increase the number of flowers or the yield per plant relative to the control. With transplant at 60 das, the cultivation in the greenhouse took only 85 days, which makes it possible to grow four cycles per year and increase the yield compared to other intensive greenhouse tomato production systems.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Solanum lycopersicum L.]]></kwd>
<kwd lng="es"><![CDATA[calidad de plántula]]></kwd>
<kwd lng="es"><![CDATA[luz suplementaria]]></kwd>
<kwd lng="es"><![CDATA[trasplante tardío]]></kwd>
<kwd lng="en"><![CDATA[Solanum lycopersicum L.]]></kwd>
<kwd lng="en"><![CDATA[delayed transplant]]></kwd>
<kwd lng="en"><![CDATA[seedling quality]]></kwd>
<kwd lng="en"><![CDATA[supplementary light]]></kwd>
</kwd-group>
</article-meta>
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