<?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>2011-2173</journal-id>
<journal-title><![CDATA[Revista Colombiana de Ciencias Hortícolas]]></journal-title>
<abbrev-journal-title><![CDATA[rev.colomb.cienc.hortic.]]></abbrev-journal-title>
<issn>2011-2173</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Colombiana de Ciencias Hotícolas, Universidad Pedagógica y Tecnológica de Colombia]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2011-21732018000200293</article-id>
<article-id pub-id-type="doi">10.17584/rcch.2018vl2i2.8092</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Efecto de las deficiencias y excesos de fósforo, potasio y boro en la fisiología y el crecimiento de plantas de aguacate (Persea americana, cv. Hass)]]></article-title>
<article-title xml:lang="en"><![CDATA[Effect of deficiencies and excesses of phosphorus, potassium and boron on the physiology and growth of avocado (Persea americana, cv. Hass) plants]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[NOVOA]]></surname>
<given-names><![CDATA[MARÍA ALEJANDRA]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[MIRANDA]]></surname>
<given-names><![CDATA[DIEGO]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[MELGAREJO]]></surname>
<given-names><![CDATA[LUZ MARINA]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional de Colombia Facultad de Ciencias, Departamento de Biología Laboratorio de Fisiología y Bioquímica Vegetal]]></institution>
<addr-line><![CDATA[Bogotá ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional de Colombia Facultad de Ciencias Agrarias Departamento de Agronomía]]></institution>
<addr-line><![CDATA[Bogotá ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2018</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2018</year>
</pub-date>
<volume>12</volume>
<numero>2</numero>
<fpage>293</fpage>
<lpage>307</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S2011-21732018000200293&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S2011-21732018000200293&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S2011-21732018000200293&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Para conocer el efecto de los nutrientes minerales potasio (K), boro (B) y fósforo (P), sobre variables fisiológicas y de crecimiento en aguacate var. Hass, se evaluaron siete tratamientos y cuatro réplicas con tres niveles de dosis: (1) deficiencia del respectivo elemento: 50% de la fertilización completa, (2) completa o tratamiento control: 100% y (3) exceso con un 150% por encima de la fertilización completa, dispuestos en un diseño completamente aleatorio. Las plantas crecieron en bolsas de polietileno, con suelo, y bajo condiciones de invernadero. Se realizó fertilización y riego semanal. Las variables evaluadas fueron el área foliar (AF), número de hojas (NH), contenido relativo de clorofilas (CC), eficiencia máxima fotoquímica del fotosistema II (Fv/ Fm) y transpiración (E), además se describió la sintomatología de deficiencias o excesos en hojas. Se encontró que los valores de AF, NH y CC fueron menores en relación con el control. De igual forma, Fv/Fm y la E fueron menores con respecto al control, sugiriendo probable estrés ocasionado por los tratamientos; presentándose en mayor proporción para P, seguido de K y B. Los signos visuales de estrés nutricional se observaron de forma más clara en las plantas sometidas a deficiencia que en aquellas sometidas a exceso, siendo acorde a lo reportado para esta variedad.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT In order to observe the effects of nutrients: potassium (K), boron (B) and phosphorus (P), on physiological and growth variables in avocado var. Hass, seven treatments and four repetitions with three dose levels were evaluated: (1) deficiency of the respective element: 50% or half of the complete fertilization, (2) complete or control treatment: 100%, and (3) excess of the respective element, 150% above the complete fertilization, arranged in a completely random design. The plants were grown in polyethylene bags with soil and cultivated under greenhouse conditions; weekly fertilization and irrigation were also carried out. The evaluated variables included leaf area (LA), number of leaves (NL), relative chlorophyll content (CC), maximum photochemical efficiency of PSII (Fv/Fm) and transpiration (E); the symptomatology of deficiencies and excesses were described in the leaves. The LA, NL and CC values were lower in relation to the control. Similarly, the Fv/Fm and E were lower compared to the control, suggesting probable stress caused by the treatments, presenting a greater proportion of P, followed by K and B. The visual signs of nutrient stress were observed more clearly in the plants subjected to deficiency than in those subjected to excess, consistent with what has been reported for this variety.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[nutrición mineral]]></kwd>
<kwd lng="es"><![CDATA[área foliar]]></kwd>
<kwd lng="es"><![CDATA[fluorescencia de la clorofila]]></kwd>
<kwd lng="es"><![CDATA[transpiración]]></kwd>
<kwd lng="es"><![CDATA[síntomas de deficiencia y exceso]]></kwd>
<kwd lng="es"><![CDATA[frutales]]></kwd>
<kwd lng="en"><![CDATA[mineral nutrition]]></kwd>
<kwd lng="en"><![CDATA[leaf area]]></kwd>
<kwd lng="en"><![CDATA[chlorophyll fluorescence]]></kwd>
<kwd lng="en"><![CDATA[transpiration]]></kwd>
<kwd lng="en"><![CDATA[deficiency and excess symptoms]]></kwd>
<kwd lng="en"><![CDATA[fruits]]></kwd>
</kwd-group>
</article-meta>
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