<?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>0120-548X</journal-id>
<journal-title><![CDATA[Acta Biológica Colombiana]]></journal-title>
<abbrev-journal-title><![CDATA[Acta biol.Colomb.]]></abbrev-journal-title>
<issn>0120-548X</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional de Colombia, Facultad de Ciencias, Departamento de Biología]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0120-548X2021000200160</article-id>
<article-id pub-id-type="doi">10.15446/abc.v26n2.83199</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[BASE GROWTH TEMPERATURE AND PHYLLOCHRON FOR KIKUYU GRASS (Cenchrus clandestinas; Poaceae)]]></article-title>
<article-title xml:lang="es"><![CDATA[Temperatura base de crecimiento y filocrono para el pasto kikuyo (Cenchrus clandestinus; Poacea)]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[ACERO-CAMELO]]></surname>
<given-names><![CDATA[Amanda]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[MOLINA]]></surname>
<given-names><![CDATA[Esteban]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[PARRA-CORONADO]]></surname>
<given-names><![CDATA[Alfonso]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[FISCHER]]></surname>
<given-names><![CDATA[Gerhard]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[CARULLA-FORNAGUERA]]></surname>
<given-names><![CDATA[Juan Evangelista]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional de Colombia  ]]></institution>
<addr-line><![CDATA[Bogotá ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional de Colombia Departamento de Ingeniería Civil y Agrícola Facultad de Ingeniería]]></institution>
<addr-line><![CDATA[Bogotá ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Nacional de Colombia Facultad de Ciencias Agrarias ]]></institution>
<addr-line><![CDATA[Bogotá ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2021</year>
</pub-date>
<volume>26</volume>
<numero>2</numero>
<fpage>160</fpage>
<lpage>169</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0120-548X2021000200160&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0120-548X2021000200160&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0120-548X2021000200160&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT In order to estimate the base temperature (Bt) of growth through the appearance of leaves and calculate the phyllochron for kikuyu grass, three plots were established on three farms in the Provincia of Ubaté (Cundinamarca, Colombia) located at different altitudes (2560, 2640, 3143 m. a. s. l.). Measurements were made in four cycles in a period of eight months. The Bt was estimated by the least coefficient of variation method using a second order regression model and the model obtained was validated by the cross-validation method. The Bt values for the first, second, third and fourth leafwere 4.02, 3.68, 3.93, and 3.62 °C, respectively. For the appearance of the first leaf, the kikuyu required more thermal time (TT) (97.5 accumulated growing degree days (AGDD)) than for the second (74.2 AGDD), third (73.8 AGDD) and fourth leaf (76.0 AGDD) (p &lt;0.05). There were no differences in TT among farms (p&gt; 0.05). There was a tendency to a greater number of days required to reach each leaf stage in the farm located at higher altitude and with lower mean temperature. The validation showed an adequate adjustment (r2 = 0.94) and a substantial concordance (CCC = 0.97) between the observed values and the predicted values for the estimated TT with the Bt value obtained for each leaf stage. The results ofBt for kikuyu grass obtained, will allow to make more precise predictions about the phyllochron and generate growth models close to reality.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Con el fin de estimar la temperatura base (Tb) de crecimiento a través de la aparición de hojas y calcular el filocrono para el pasto kikuyo, se establecieron tres parcelas en tres fincas de la provincia de Ubaté (Cundinamarca, Colombia) ubicadas a diferente altitud (2560, 2640, 3143 m. s. n. m.). Se realizaron cuatro ciclos de mediciones en un tiempo total de ocho meses. La Tb se estimó por el método de mínimo coeficiente de variación utilizando un modelo de regresión de segundo grado y el modelo obtenido se validó por el método de validación cruzada. La Tb para la primera, segunda, tercera y cuarta hoja fue 4,02, 3,68, 3,93 y 3,62 °C, respectivamente. El kikuyo requirió mayor tiempo térmico (TT) para la aparición de la primera hoja (97,5 grados día de crecimiento acumulados (GDCA)) que para la segunda (74,2 GDCA), tercera (73,8 GDCA) y cuarta hoja (76,0 GDCA) (p&lt;0,05). No hubo diferencias en el TT entre fincas (p &gt; 0,05). Hubo tendencia a un mayor número de días calendario requeridos para alcanzar cada estado de hoja en la finca ubicada a mayor altitud y con menor temperatura media. La validación mostró un adecuado ajuste (r2 = 0,94) y una concordancia sustancial (CCC= 0,97) entre los valores observados y los valores predichos para el TT estimado con los valores de Tb obtenidos para cada estado de hoja. Los resultados de Tb de crecimiento del pasto kikuyo obtenidos permiten realizar predicciones más precisas sobre el filocrono y generar modelos de crecimiento cercanos a la realidad.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[growth models]]></kwd>
<kwd lng="en"><![CDATA[leaf appearance rate]]></kwd>
<kwd lng="en"><![CDATA[Pennisetum clandestinum]]></kwd>
<kwd lng="en"><![CDATA[tropical forage]]></kwd>
<kwd lng="es"><![CDATA[forraje tropical]]></kwd>
<kwd lng="es"><![CDATA[modelos de crecimiento]]></kwd>
<kwd lng="es"><![CDATA[Pennisetum clandestinum]]></kwd>
<kwd lng="es"><![CDATA[tasa de aparición de hojas]]></kwd>
</kwd-group>
</article-meta>
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