<?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>S0187-73802021000300349</article-id>
<article-id pub-id-type="doi">10.35196/rfm.2021.3.349</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Phenology and growing degree days of festival strawberry grown on red volcanic rock at two plant densities]]></article-title>
<article-title xml:lang="es"><![CDATA[Fenología y grados días de desarrollo de fresa festival cultivada en tezontle en dos densidades de población]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Alvarado-Raya]]></surname>
<given-names><![CDATA[Horacio E.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vázquez-Rodríguez]]></surname>
<given-names><![CDATA[José C.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ramírez-Arias]]></surname>
<given-names><![CDATA[Armando]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Calderón-Zavala]]></surname>
<given-names><![CDATA[Guillermo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rivera-del-Río]]></surname>
<given-names><![CDATA[Roberto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Autónoma Chapingo Departamento de Preparatoria Agrícola ]]></institution>
<addr-line><![CDATA[Texcoco Estado de México]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,UACh Departamento de Fitotecnia ]]></institution>
<addr-line><![CDATA[Texcoco Estado de México]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Colegio de Posgraduados  ]]></institution>
<addr-line><![CDATA[Texcoco Estado de México]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>09</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>09</month>
<year>2021</year>
</pub-date>
<volume>44</volume>
<numero>3</numero>
<fpage>349</fpage>
<lpage>356</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0187-73802021000300349&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0187-73802021000300349&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0187-73802021000300349&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Summary Due to their correlation with temperature, growing degree days (GDD) allow to analyze the effect of climate change on plant phenology, while being also useful for scheduling activities in a cultivation system. Fruit cropping systems in general lack enough information in this regard. This research aimed to determine GDD during the phenology of Festival strawberry (Fragaria × ananassa Duch.) grown on two substrates at two plant densities under a macro-tunnel. Previously chilled (4 oC/720 h), one-leaf plants were grown from August 2016 to March 2017 either in hydroponics on red volcanic rock or in soil with fertigation at 10 or 15 plants m-2. A Steiner nutrient solution reduced to 50% of its original concentration was used. GDD were counted daily after planting using the single sine curve method with a base temperature of 3 oC. A high correlation coefficient (r &gt; 0.964) was found between GDD and days after planting (DAP) for the phenological stages studied. The phyllochron was not affected by treatments, and 597 GDD were required as an average for the onset of leafing and a high correlation between air temperature and the emission of leaves number 2 to 10 (r = 0.9754; P &#8804; 0.0001). The substrate did not affect the chronology of the reproductive phenological stages. The onset of anthesis was delayed by 17 days in plants grown at 15 plants m-2 (2039.4 GDD) compared to those grown at 10 plants m-2 (1829.7 GDD), but there was no effect of plant density for the sequent phenological stages. It is concluded that GDD have a high predictive value in Festival strawberry for DAP of the phenological stages studied; likewise, the phyllochron and reproductive phenology were not affected by substrate cultivation; however, planting at high densities could delay the onset of anthesis.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Por su correlación con la temperatura, los grados días de desarrollo (GDD) permiten analizar el efecto del cambio climático en la fitofenología y también son útiles para programar actividades en un sistema de cultivo. La fruticultura en general carece de suficiente información al respecto. El objetivo de esta investigación fue determinar los GDD en la fenología de fresa (Fragaria × ananassa Duch.) Festival cultivada en dos sustratos a dos densidades de población bajo un macro-túnel. Plantas con una hoja y previamente enfriadas (4 oC/720 h) se cultivaron de agosto 2016 a marzo 2017 en hidroponía con tezontle o en suelo con fertirriego a densidades de 10 o 15 plantas m-2. Se utilizó una solución nutritiva Steiner reducida al 50 % de su concentración original. Los GDD se determinaron diariamente a partir de la plantación mediante el método del seno simple con temperatura base de 3.0 oC. Se encontró una alta correlación (r &gt; 0.964) entre los GDD y los días después de plantación (DDP) para las fenofases estudiadas. El filocrono no fue afectado por los tratamientos, requiriéndose en promedio 597 GDD para iniciar la foliación y existió una correlación alta entre la temperatura del aire y la emisión de las hojas 2 a 10 (r = 0.9754; P &#8804; 0.0001). El sustrato no afectó la cronología de las fenofases reproductivas. El inicio de la antesis se atrasó en 17 días en plantas cultivadas a 15 plantas m-2 (2039.4 GDD) en comparación con aquellas cultivadas a 10 plantas m-2 (1829.7 GDD), pero no hubo efecto de la densidad de población para las siguientes fenofases. Se concluye que en fresa Festival los GDD tienen un alto valor predictivo para los DDP de las fenofases estudiadas; igualmente, el filocrono y la fenología reproductiva no son afectados por el cultivo en sustrato, aunque plantar a altas densidades podría atrasar el inicio de la antesis.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Fragaria × ananassa Duch.]]></kwd>
<kwd lng="en"><![CDATA[anthesis]]></kwd>
<kwd lng="en"><![CDATA[phenology]]></kwd>
<kwd lng="en"><![CDATA[phyllochron]]></kwd>
<kwd lng="en"><![CDATA[plant density]]></kwd>
<kwd lng="en"><![CDATA[red volcanic rock]]></kwd>
<kwd lng="es"><![CDATA[Fragaria × ananassa Duch.]]></kwd>
<kwd lng="es"><![CDATA[antesis]]></kwd>
<kwd lng="es"><![CDATA[densidad de plantación]]></kwd>
<kwd lng="es"><![CDATA[fenología]]></kwd>
<kwd lng="es"><![CDATA[filocrono]]></kwd>
<kwd lng="es"><![CDATA[tezontle]]></kwd>
</kwd-group>
</article-meta>
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