<?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>S0187-73802022000200183</article-id>
<article-id pub-id-type="doi">10.35196/rfm.2022.2.183</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Tomato fruit quality between clusters is differentially affected by nitrogen and potassium supply]]></article-title>
<article-title xml:lang="es"><![CDATA[La calidad del fruto de tomate entre racimos es afectada diferencialmente por el suministro de nitrógeno y potasio]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[San-Martín-Hernández]]></surname>
<given-names><![CDATA[Cesar]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gómez-Merino]]></surname>
<given-names><![CDATA[Fernando C.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rivera-Vargas]]></surname>
<given-names><![CDATA[Giovanna]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Saucedo-Veloz]]></surname>
<given-names><![CDATA[Crescenciano]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vaquera-Huerta]]></surname>
<given-names><![CDATA[Humberto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Trejo-Téllez]]></surname>
<given-names><![CDATA[Libia I.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Colegio de Postgraduados Campus Montecillo ]]></institution>
<addr-line><![CDATA[Texcoco Estado de México]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2022</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2022</year>
</pub-date>
<volume>45</volume>
<numero>2</numero>
<fpage>183</fpage>
<lpage>192</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0187-73802022000200183&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0187-73802022000200183&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0187-73802022000200183&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[SUMMARY Fruit quality is significantly affected by the nutrient status of plants; nonetheless, it has not yet been deeply explored how nitrogen (N) and potassium (K) supply affects tomato fruit quality between clusters during the vegetative and reproductive stages of the crop. The aim of this study was to evaluate the effects of N and K on fruit quality parameters of three clusters of hydroponically grown tomato (Solanum lycopersicum L.). Nitrogen (10, 12, 14 and 16 molc N m-3) was evaluated at the vegetative stage, and potassium (5, 7, 9, 11 and 13 molc K m-3) at the reproductive stage. The evaluated N and K concentrations showed significant main effects on the quality attributes total soluble solids, citric acid percentage, reducing sugars, color and lycopene concentration; yield was affected only by K, while the effects of N × K interaction were not significant. Increasing N concentrations from 10 to 16 molc m-3 enhanced hue angle, brightness, reducing sugars and citric acid percentage, but decreased total soluble solids and lycopene. As K increased from 5 to 13 molc m-3 in the nutrient solution, total soluble solids, citric acid, reducing sugars, lycopene, yield and fruit brightness increased, but hue decreased. Total soluble solids, reducing sugars and lycopene gradually increased from the first to the fifth cluster, while yield, color attributes of hue and brightness tended to decrease as the crop cycle progressed. Titratable acidity percentage showed no clear trends between clusters. It is concluded that N and K differentially affect tomato quality between clusters.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN La calidad del fruto es afectada significativamente por el estado nutricional de las plantas; no obstante, aún no se ha explorado a profundidad la manera en que el suministro de nitrógeno (N) y potasio (K) afecta la calidad del fruto de tomate entre racimos durante las etapas vegetativa y reproductiva del cultivo. El objetivo del presente estudio fue evaluar los efectos del N y K en los parámetros de calidad del fruto de tres racimos de tomate (Solanum lycopersicum L.) cultivado en hidroponía. Se evaluó nitrógeno (10, 12, 14 y 16 molc N m-3) en la etapa vegetativa y potasio (5, 7, 9, 11 y 13 molc K m-3) en la etapa reproductiva. Las concentraciones de N y K evaluadas mostraron efectos principales significativos en los atributos de calidad sólidos solubles totales, porcentaje de ácido cítrico, azúcares reductores, color y concentración de licopeno; el rendimiento fue afectado sólo por K, mientras que los efectos de la interacción N × K no fueron significativos. El incremento de la concentración de N de 10 a 16 molc m-3 mejoró el ángulo de tonalidad, el brillo, y los porcentajes de azúcares reductores y de ácido cítrico, pero disminuyeron los sólidos solubles totales y el licopeno. A medida que K aumentó de 5 a 13 molc m-3 en la solución nutritiva, los sólidos solubles totales, ácido cítrico, los azúcares reductores, el licopeno, el rendimiento y el brillo del fruto se incrementaron, pero la tonalidad disminuyó. Los sólidos solubles totales, los azúcares reductores y el licopeno aumentaron gradualmente del primer al quinto racimo, mientras que el rendimiento, los atributos de color de matiz y el brillo tendieron a la baja a medida que avanzó el ciclo de cultivo. El porcentaje de acidez titulable no mostró tendencias claras entre racimos. Se concluye que el N y el K afectan diferencialmente la calidad del tomate entre racimos.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Solanum lycopersicum L.]]></kwd>
<kwd lng="en"><![CDATA[hydroponics]]></kwd>
<kwd lng="en"><![CDATA[K nutrition]]></kwd>
<kwd lng="en"><![CDATA[N nutrition]]></kwd>
<kwd lng="en"><![CDATA[reducing sugars]]></kwd>
<kwd lng="en"><![CDATA[tomato clusters]]></kwd>
<kwd lng="es"><![CDATA[Solanum lycopersicum L.]]></kwd>
<kwd lng="es"><![CDATA[azúcares reductores]]></kwd>
<kwd lng="es"><![CDATA[hidroponía]]></kwd>
<kwd lng="es"><![CDATA[nutrición nitrogenada]]></kwd>
<kwd lng="es"><![CDATA[nutrición potásica]]></kwd>
<kwd lng="es"><![CDATA[racimos de tomate]]></kwd>
</kwd-group>
</article-meta>
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