<?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>0120-2812</journal-id>
<journal-title><![CDATA[Acta Agronómica]]></journal-title>
<abbrev-journal-title><![CDATA[Acta Agron.]]></abbrev-journal-title>
<issn>0120-2812</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional de Colombia]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0120-28122020000300196</article-id>
<article-id pub-id-type="doi">10.15446/acag.v69n3.81441</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Manejo de nutrientes en solución basado en la conductividad eléctrica y concentración de iones en lixiviados de cultivo de tomate (Lycopersicon esculentum Mill.)]]></article-title>
<article-title xml:lang="en"><![CDATA[Management of nutrients in solution based on electrical conductivity andionic concentrations in leached of tomato (Lycopersicon esculentum Mill.)]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Barzan.]]></surname>
<given-names><![CDATA[Renan Ribeiro]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Takahashi.]]></surname>
<given-names><![CDATA[Hideaki Wilson]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[de Freitas Fregonezi.]]></surname>
<given-names><![CDATA[Gustavo Adolfo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Di Loreto y Sampaio.]]></surname>
<given-names><![CDATA[Marita]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Firmano.]]></surname>
<given-names><![CDATA[Ruan Francisco]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sandoval Contreras.]]></surname>
<given-names><![CDATA[Hector Augusto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto de Desenvolvimento Rural do Paraná - IDR-Paraná  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Brasil</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidade Estadual de Londrina  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Brazil</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Centro Universitário Filadélfia  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Brazil</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Universidade de Sao Paulo - USP  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Brazil</country>
</aff>
<aff id="Af5">
<institution><![CDATA[,Corporación colombiana de investigación agropecuaria - Agrosavia  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>09</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>09</month>
<year>2020</year>
</pub-date>
<volume>69</volume>
<numero>3</numero>
<fpage>196</fpage>
<lpage>202</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0120-28122020000300196&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0120-28122020000300196&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0120-28122020000300196&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen La fertirrigación se caracteriza por una mayor eficiencia en el uso de insumos como agua y fertilizantes, además de la facilidad para programar la aplicación de nutrientes según los requerimientos de cultivo. El objetivo en este estudio fue evaluar dos formas diferentes de manejo de fertirrigación utilizando lixiviados resultantes de la aplicación de insumos de síntesis en cultivo tomate   (Lycopersiconesculentum Mill.). Los manejos se basaron en la conductividad eléctrica (CE) y la concentración individual de iones (CI) en el lixiviado, con dos niveles base iniciales de nutrientes (1.6 y 3.2 dS/m). Los lixiviado fueron recolectados cada semana para analizar la CE y la CI de N, P, K, Ca, Mg y S, y con base en ellos manejar los nutrientes en solución. Cuando los valores de CE eran menores o mayores que el 20% del valor establecido, la solución nutritiva fue diluida o concentrada en un porcentaje igual, adicionando agua o una solución principal (20 dS/m), respectivamente. Los resultados mostraron que, las aplicaciones de N, P y K fueron más altas en el manejo CI, pero no así para Ca y Mg, lo que afecta el estado nutricional de la planta. Los parámetros fitotécnicos de los frutos de tomate presentaron mejores características cuando se utiliza la CE como criterio para el manejo de fertirrigación, mientras que el incremento en el nivel inicial de nutrientes se reflejó en una mayor producción.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Fertigation is characterized by greater efficiency in the use of inputs such as water and fertilizers, in addition to the ease of programming the application of nutrients according to crop requirements. The objective of this study was to evaluate two different forms of fertigation management using leachates resulting from the application of synthetic inputs in tomato cultivation   (Lycopersicon esculentum Mill.). Management was based on the electrical conductivity (EC) and individual ion concentration (CI) in the leachate, with two initial base levels of nutrients (1.6 and 3.2 dS / m). Leachates were collected every week to analyse EC and IC of N, P, K, Ca, Mg and S, and based on this, manage nutrients in solution. When the EC value was less than or greater than 20% of the established value, the nutrient solution was diluted or concentrated in an equal percentage, adding water or a main solution (20 dS / m), respectively. Results showed that applications of N, P and K were higher in IC management, but not so for Ca and Mg, which affects the nutritional status of the plant. Phytotechnical parameters of tomato fruits presented better characteristics when CE is used as a criterion for fertigation management, while the increase in the initial level of nutrients was reflected in a higher production.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Lycopersicon esculentum Mill.]]></kwd>
<kwd lng="es"><![CDATA[Cultivo protegido]]></kwd>
<kwd lng="es"><![CDATA[Fertirrigación]]></kwd>
<kwd lng="es"><![CDATA[Nutrición de hortalizas]]></kwd>
<kwd lng="es"><![CDATA[Solución nutritiva]]></kwd>
<kwd lng="en"><![CDATA[Lycopersicon esculentum Mill.]]></kwd>
<kwd lng="en"><![CDATA[Protected cultivation]]></kwd>
<kwd lng="en"><![CDATA[Fertigation]]></kwd>
<kwd lng="en"><![CDATA[Nutrient solution]]></kwd>
<kwd lng="en"><![CDATA[Vegetable crop nutrition]]></kwd>
</kwd-group>
</article-meta>
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