<?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>S0187-73802021000100059</article-id>
<article-id pub-id-type="doi">10.35196/rfm.2021.1.59</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Fertilización integral en árboles de naranjo &#8216;MARRS&#8217; en producción con síntomas devirus de la tristeza de los cítricos (VTC) y huanglongbing (HLB)]]></article-title>
<article-title xml:lang="en"><![CDATA[Integral fertilization in &#8216;MARSS&#8217; orange trees under production with citrus tristeza virus (CTV) and huanglongbing (HLB) symptoms]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hernández-Morales]]></surname>
<given-names><![CDATA[Luis M.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[García-Pérez]]></surname>
<given-names><![CDATA[Eliseo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cortés-Flores]]></surname>
<given-names><![CDATA[José I.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Villegas-Monter]]></surname>
<given-names><![CDATA[Ángel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mora-Aguilera]]></surname>
<given-names><![CDATA[José A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Colegio de Postgraduados Posgrado en Recursos Genéticos y Productividad-Fruticultura ]]></institution>
<addr-line><![CDATA[Texcoco Estado de México]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Colegio de Postgraduados  ]]></institution>
<addr-line><![CDATA[Tepetates Veracruz]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Colegio de Postgraduados  ]]></institution>
<addr-line><![CDATA[Texcoco Estado de México]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,CP  ]]></institution>
<addr-line><![CDATA[Texcoco Estado de México]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>03</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>03</month>
<year>2021</year>
</pub-date>
<volume>44</volume>
<numero>1</numero>
<fpage>59</fpage>
<lpage>66</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0187-73802021000100059&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0187-73802021000100059&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0187-73802021000100059&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN En México, la producción de naranja es amenazada por la incidencia de enfermedades que afectan la producción. La nutrición balanceada constituye una alternativa para mantener productivos a los árboles y atenuar el daño por fito-parásitos. El objetivo del presente estudio fue evaluar el efecto de la fertilización química, orgánica y combinada tanto al suelo como foliar sobre la producción de naranjos Marrs (Citrus sinensis/C. volkameriana) con incidencia del virus tristeza de los cítricos (VTC) y Huanglongbing (HLB) confirmada por PCR. El estudio se realizó de agosto 2018 a diciembre 2019 en Cazones, Veracruz, México en una plantación comercial con árboles de seis años. Por la topografía irregular se trabajó en la parte baja y alta del terreno, en árboles con tres grados de síntomas de VTC y HLB. El diseño experimental utilizado fue bloques completos al azar en arreglo de parcelas divididas, con tres repeticiones. Las variables evaluadas fueron la incidencia de VTC y HLB, floración, número de frutos y rendimiento. La mayor incidencia de VTC (47%) y de HLB (64.7%) se encontró en la parte baja del terreno. Los árboles asintomáticos y con síntomas ligeros de ambas enfermedades presentaron mayor floración y número de frutos en la fase inicial. La fertilización química (100 N-22 P2O5-195 K2O-30 MgO) y combinada (50% química más 10 kg de composta) aplicada al suelo, más fertilización foliar con sulfato de zinc, hierro, cobre, manganeso y bórax incrementaron la floración hasta 96 flores por m2 de dosel en la parte alta del terreno, y hasta 89 frutos por rama primaria en la fase inicial de crecimiento. El rendimiento por árbol fue muy bajo (5 a 12 kg), por efecto de una sequía atípica en la región durante la fructificación. La incidencia y severidad de VTC y HLB, aunado al estrés hídrico limitan la producción del naranjo Marrs.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[SUMMARY In Mexico, orange production is threatened by the incidence of diseases that affect production. Balanced nutrition is an alternative to keep trees productive and reduce damage by plant parasites. The objective of this study was to evaluate the effect of chemical, organic and combined fertilization both on the soil and foliage on the production of Marrs orange trees (C. sinensis/C. volkameriana) with incidence of citrus tristeza virus (CTV) and Huanglongbing (HLB) as confirmed by PCR. The study was conducted from August 2018 to December 2019 in Cazones, Veracruz, Mexico in a commercial plantation with six-year-old trees. Due to the irregular topography, the study was carried out in the lower and upper part of the field, in trees with three degrees of CTV and HLB symptoms. The experimental design used was randomized complete blocks in split plot arrangement with three replications. Variables evaluated were the incidence of CTV and HLB, flowering, number of fruits and yield. The highest incidence of CTV (47&#1642;) and HLB (64.7&#1642;) was found in the lower part of the field. Asymptomatic trees with mild symptoms of both diseases presented higher flowering and number of fruits in the initial phase. Chemical fertilization (100 N-22 P2O5-195 K2O-30 MgO) and combined (50 &#1642; chemical plus 10 kg of compost) applied to the soil, plus foliar fertilization with zinc sulfate, iron, copper, manganese and borax increased flowering up to 96 flowers per m2 of canopy in the upper part of the field, and up to 89 fruits per primary branch in the initial phase of growth. The yield per tree was very low (5 to 12 kg), due to an atypical drought in the region during fruiting. The incidence and severity of CTV and HLB, along with water stress, limit the production of the Marrs orange tree.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Citrus sinensis]]></kwd>
<kwd lng="es"><![CDATA[fertilización]]></kwd>
<kwd lng="es"><![CDATA[producción]]></kwd>
<kwd lng="es"><![CDATA[síntomas de VTC y HLB]]></kwd>
<kwd lng="en"><![CDATA[Citrus sinensis]]></kwd>
<kwd lng="en"><![CDATA[fertilization]]></kwd>
<kwd lng="en"><![CDATA[production]]></kwd>
<kwd lng="en"><![CDATA[symptoms of CTV and HLB]]></kwd>
</kwd-group>
</article-meta>
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