<?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>S0120-99652023000200015</article-id>
<article-id pub-id-type="doi">10.15446/agron.colomb.v41n2.110036</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Time of contact of phosphate fertilizer with Megathyrsus maximus (cv. Massai) seeds in relation to germination and growth]]></article-title>
<article-title xml:lang="es"><![CDATA[Tiempo de contacto del fertilizante fosfatado con semillas de Megathyrsus maximus (cv. Massai) en relación con la germinación y el crecimiento]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[de Arruda Rodrigues]]></surname>
<given-names><![CDATA[Helen Cristina]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rodrigues Machado]]></surname>
<given-names><![CDATA[Rayanny]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Torres Brito]]></surname>
<given-names><![CDATA[Rosemary Cordeiro]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Dias de Oliveira Neto]]></surname>
<given-names><![CDATA[Edson]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Antunes Souza]]></surname>
<given-names><![CDATA[Henrique]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,State University of Piauí  ]]></institution>
<addr-line><![CDATA[Teresina Piauí]]></addr-line>
<country>Brazil</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,State University of Piauí  ]]></institution>
<addr-line><![CDATA[Teresina Piauí]]></addr-line>
<country>Brazil</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,University of Piauí  ]]></institution>
<addr-line><![CDATA[Teresina Piauí]]></addr-line>
<country>Brazil</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Corporation - Embrapa Mid-North/Mid-North Agricultural Research Center/Research &amp; Development Sector  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2023</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2023</year>
</pub-date>
<volume>41</volume>
<numero>2</numero>
<fpage>1</fpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0120-99652023000200015&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0120-99652023000200015&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0120-99652023000200015&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT The aim of this research was to evaluate the effect of the contact time of simple superphosphate fertilizer with Massai grass (Megathyrsus maximus) seeds on the physiological quality of the seeds. The experiment was conducted with seeds of Massai grass in two conditions: laboratory and field. The experiment was carried out in Teresina, Piauí, Brazil. The experimental design was completely randomized, with three replicates for both conditions. The treatments consisted of seven contact times: 0, 3, 6, 9, 24, 48, and 72 h. Germination (GP) and emergence (EP) percentages, seedling height (SH), root length (RL), and germination speed index (GSI) were evaluated. The contact time of the fertilizer with the seeds had a significant effect on all variables, except root length and emergence at 7 d. For GP in the second data collection and GSI, there were no differences up to 3 h of contact; however, for GP in the first collection, SH and GSI at 21 d, the contact of seeds with fertilizer for 3 h already had negative effects on these variables, reducing them by 23.33%, 12.13 cm and 14.28% respectively. The longer the contact time between single superphosphate with M. maximus (cv. Massai) seeds, the lower the germination and vigor values.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN El objetivo de esta investigación fue evaluar el efecto del tiempo de contacto del fertilizante superfosfato simple con semillas de pasto Massai (Megathyrsus maximus) sobre la calidad fisiológica de las semillas. El experimento se realizó con semillas de pasto Massai en dos condiciones: laboratorio y campo. El experimento se llevó a cabo en Teresina, Piauí, Brasil. El diseño experimental fue completamente al azar, con tres repeticiones para ambas condiciones. Los tratamientos consistieron en siete tiempos de contacto: 0, 3, 6, 9, 24, 48 y 72 h. Se evaluaron porcentajes de germinación (PG) y emergencia (PE), altura de plántula (AP), longitud de raíz (LR) e índice de velocidad de germinación (IVG). El tiempo de contacto del fertilizante con las semillas tuvo un efecto significativo en todas las variables, excepto en la longitud de las raíces y la emergencia a los 7 d. Para PG en la segunda toma de datos e IVG no hubo diferencias hasta las 3 h de contacto; sin embargo, para PG en la primera colecta, SH e IVG a los 21 d, el contacto de las semillas con el fertilizante durante 3 h tuvo efectos negativos sobre estas variables, reduciéndolas en 23.33%, 12.13 cm y 14.28% respectivamente. A mayor tiempo de contacto entre el superfosfato simple y las semillas de M. maximus (cv. Massai), menores valores de germinación y vigor.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[seedling emergence]]></kwd>
<kwd lng="en"><![CDATA[physiological quality]]></kwd>
<kwd lng="en"><![CDATA[forage]]></kwd>
<kwd lng="en"><![CDATA[seed germination]]></kwd>
<kwd lng="es"><![CDATA[emergencia de plántulas]]></kwd>
<kwd lng="es"><![CDATA[calidad fisiológica]]></kwd>
<kwd lng="es"><![CDATA[forraje]]></kwd>
<kwd lng="es"><![CDATA[germinación de semillas]]></kwd>
</kwd-group>
</article-meta>
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