<?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>1405-3195</journal-id>
<journal-title><![CDATA[Agrociencia]]></journal-title>
<abbrev-journal-title><![CDATA[Agrociencia]]></abbrev-journal-title>
<issn>1405-3195</issn>
<publisher>
<publisher-name><![CDATA[Colegio de Postgraduados]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1405-31952017000200229</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Producción de látex en el tablero alto de árboles de hule (Hevea brasiliensis) estimulado con ácido-2-cloroetil-fosfónico]]></article-title>
<article-title xml:lang="en"><![CDATA[Latex production in the high panel of rubber trees (Hevea brasiliensis) stimulated with 2-chloroethyl phosphonic acid]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Barragán-Hernández]]></surname>
<given-names><![CDATA[Rodolfo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Domínguez-Domínguez]]></surname>
<given-names><![CDATA[Marivel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ramírez-Valverde]]></surname>
<given-names><![CDATA[Gustavo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ortiz-García]]></surname>
<given-names><![CDATA[Carlos F.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Martínez-Zurimendi]]></surname>
<given-names><![CDATA[Pablo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Colegio de Postgraduados  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Colegio de Postgraduados  ]]></institution>
<addr-line><![CDATA[Tabasco ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Colegio de Postgraduados  ]]></institution>
<addr-line><![CDATA[ Estado de México]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Colegio de la Frontera Sur  ]]></institution>
<addr-line><![CDATA[Tabasco ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af5">
<institution><![CDATA[,Universidad de Valladolid  ]]></institution>
<addr-line><![CDATA[Valencia ]]></addr-line>
<country>Spain</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>03</month>
<year>2017</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>03</month>
<year>2017</year>
</pub-date>
<volume>51</volume>
<numero>2</numero>
<fpage>229</fpage>
<lpage>243</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-31952017000200229&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-31952017000200229&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-31952017000200229&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen En las plantaciones de hule (Hevea brasiliensis Müell. Arg.) el tallo del árbol se divide para su aprovechamiento en partes longitudinales simétricas, denominadas &#8220;tablero de pica&#8221;. El tablero bajo inicia a 1.0 m sobre el nivel del suelo, en forma descendente y el tablero alto a 1.5 m sobre el suelo, en forma ascendente. En México las plantaciones se aprovechan por 25 años, pero el 30 % de ellas puede aprovecharse más tiempo, usando el tablero alto. Para estas plantaciones se aplica el corte de los vasos laticíferos (pica) ascendente en el tablero alto para alargar el ciclo productivo del árbol. El objetivo de este estudio fue conocer la producción de hule del tablero alto en plantaciones en edad productiva, estimulando con ethrel al 5 %, en tres frecuencias de pica, una, dos o tres por semana. La hipótesis fue que aplicando pica ascendente en tablero alto con estimulación de ethrel se puede prolongar la vida útil de las plantaciones dado que hay buena producción. Los tratamientos fueron pica ascendente en cuarto de espiral cada seis días, una pica por semana (1/4 S &#8593; d6 6d/7), cada tres, dos picas por semana, (1/4 S &#8593; d3 6d/7) y cada dos, tres picas por semana (1/4 S &#8593; d2 6d/7), estimuladas con ethrel, más las mismas frecuencias sin estimular como testigos. El diseño experimental fue parcelas divididas con una modificación en número de repeticiones del testigo, usando el material disponible, asignando al azar los tratamientos en cada parcela. Los datos se analizaron como modelo lineal mixto. Los rendimientos mayores (52 % más, respecto a la misma frecuencia sin estimular) se obtuvieron en plantaciones de 28 años en frecuencia de pica dos veces por semana estimulada con ethrel, y le siguió la frecuencia de pica tres veces por semana (32 % más, respecto a la misma frecuencia de pica testigo). En plantaciones de 20 años las frecuencias de pica dos y tres veces por semana, estimuladas con ethrel, no presentaron diferencias significativas con las mismas frecuencias de pica sin estimular.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract In rubber (Hevea brasiliensis Müell. Arg.) plantations the stem of the tree is divided for its use in symmetric longitudinal sections, known as &#8220;tapping panel&#8221;. The lower panel begins at 1.0 m above ground level, in descending form and the high panel at 1.5 m above the ground, in ascending form. In Mexico the plantations are exploited for 25 years, but 30 % of them can be exploited for a longer period of time, by utilizing the high panel. For these plantations the cut of the ascending laticiferous vesicles (tap) is made in the high panel to lengthen the productive cycle of the tree. The objective of our study was to know the rubber production of the high panel in plantations of productive age, stimulating with ethrel at 5 %, in three tapping frequencies, one, two or three per week. The hypothesis was that by applying upward taps in the high panel with ethrel stimulation, the useful life of the plantations can be extended given that there is good production. The treatments were upward taps in quarter spiral every six days, one tap per week (¼ S &#8593; d6 6d/7), every three, two taps per week, (¼ S &#8593; d3 6d/7) and every two, three taps per week (¼ S &#8593; d2 6d/7), stimulated with ethrel, plus the same frequencies without stimulation as controls. The experimental design consisted of plots divided with a modification in the number of replications of the control, utilizing the available material, and randomly assigning the treatments in each one of the plots. The data were analyzed as a mixed linear model. The highest yields (52 % higher, with respect to the same frequency without stimulation) were obtained in plantations of 28 years of age in a tapping frequency of twice a week stimulated with ethrel, followed by a tapping frequency of three times a week (32 % higher, with respect to the same frequency of the control). In plantations of 20 years the tapping frequencies of two and three times per week, stimulated with ethrel, did not present significant differences with respect to the same frequencies without stimulation.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Hevea brasiliensis]]></kwd>
<kwd lng="es"><![CDATA[frecuencia de pica]]></kwd>
<kwd lng="es"><![CDATA[ethefón]]></kwd>
<kwd lng="en"><![CDATA[Hevea brasiliensis]]></kwd>
<kwd lng="en"><![CDATA[tapping frequency]]></kwd>
<kwd lng="en"><![CDATA[ethephon]]></kwd>
</kwd-group>
</article-meta>
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