<?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>0187-5779</journal-id>
<journal-title><![CDATA[Terra Latinoamericana]]></journal-title>
<abbrev-journal-title><![CDATA[Terra Latinoam]]></abbrev-journal-title>
<issn>0187-5779</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Mexicana de la Ciencia del Suelo A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0187-57792020000300301</article-id>
<article-id pub-id-type="doi">10.28940/terra.v38i2.589</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Balance potasio:calcio, relación con el déficit de presión de vapor y la radiación fotosintéticamente activa en tomate de invernadero]]></article-title>
<article-title xml:lang="en"><![CDATA[Potassium:calcium balance, relationship with vapor pressure deficit and photosynthetically active radiation in greenhouse tomato]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Salas-Rivera]]></surname>
<given-names><![CDATA[Ramiro]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Valdez-Aguilar]]></surname>
<given-names><![CDATA[Luis Alonso]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Alvarado-Camarillo]]></surname>
<given-names><![CDATA[Daniela]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rascón-Alvarado]]></surname>
<given-names><![CDATA[Emilio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Peña-Ramos]]></surname>
<given-names><![CDATA[Fidel Maximiano]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[González-Fuentes]]></surname>
<given-names><![CDATA[José Antonio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Departamento de Horticultura  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Autónoma Agraria Antonio Narro Departamento de Ciencias del Suelo ]]></institution>
<addr-line><![CDATA[Saltillo Coahuila]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2020</year>
</pub-date>
<volume>38</volume>
<numero>2</numero>
<fpage>301</fpage>
<lpage>311</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0187-57792020000300301&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0187-57792020000300301&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0187-57792020000300301&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: La producción de tomate en invernadero demanda el conocimiento de factores técnicos como el manejo de la solución nutritiva y la interacción de ésta con las condiciones del ambiente. En la solución nutritiva pueden ocurrir desbalances entre nutrimentos como el potasio (K) y calcio (Ca); a su vez, el flujo de la savia y la translocación de éstos está influenciado por el por déficit de presión de vapor (DPV) y radiación fotosintéticamente activa (RFA). El presente estudio se realizó con los objetivos de determinar el balance óptimo de K y Ca en función del DPV y RFA prevalecientes durante el desarrollo de los frutos de los primeros 10 racimos en tomate; los primeros cinco racimos se desarrollaron durante la primavera, mientras que los racimos sexto al décimo durante el verano. Las plantas se irrigaron con soluciones nutritivas cuyos balances K:Ca fueron: 0.54, 0.64, 0.78, y 0.82. Los balances no afectaron calidad de frutos en primavera, aunque en verano, los balances 0.64 y 0.78 redujeron los sólidos solubles. En primavera, el rendimiento en cada uno de los cinco racimos estuvo influenciado por el balance K:Ca así como por el DPV; los racimos tuvieron un mayor rendimiento cuando el balance K:Ca fue de 0.64 y el DPV fue de 2.81 KPa. Durante el verano, el rendimiento más alto fue en plantas tratadas con un balance de 0.54 y el DPV fue 2.50 o 2.74 KPa. El balance K:Ca durante la primavera se correlacionó negativamente con el DPV, sin embargo, en el verano, la correlación fue positiva. El balance K:Ca óptimo debe ser de 0.78-0.82 al subir la RFA hasta un máximo de 102-142 µmol m-2 s-1, mientras que niveles extremos de RFA deben ir acompañados de una reducción en el balance K:Ca.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Summary: Greenhouse tomato production requires technical knowledge such as the management of the nutrient solution and its interaction with environmental conditions. Imbalances between nutrients such as potassium (K) and calcium (Ca) can occur in the nutrient solution; Moreover, the flow of sap and nutrients translocation are affected by the vapor pressure deficit (VPD) and photosynthetically active radiation (PAR). The present study was carried out with the objective to determine the optimal balance of K and Ca depending on VPD and PAR prevailing during the development of the fruits of 10 clusters in tomato; the first five clusters were developed during the spring, while the clusters sixth to tenth during the summer. Plants were irrigated with solutions whose K:Ca balance was: 0.54, 0.64, 0.78, and 0.82. The balance did not affect fruit quality in spring, although in summer, balances 0.64 and 0.78 reduced soluble solids. In spring, fruit yield in each of the five clusters was influenced by the K:Ca balance as well as by the VPD; the clusters had a higher fruit production when the K:Ca balance was 0.64 and the VPD was 2.81 KPa. During the summer, the highest yield in fruits was in plants treated with a balance of 0.54 and the VPD was 2.50 or 2.74 KPa. The K:Ca balance during the spring correlated negatively with the VPD, however, in the summer, the correlation was positive. In spring, the K:Ca optimum balance should be 0.78-0.82 when PAR reached a maximum of 102&#8209;142 µmol m-2 s-1, while extreme PAR levels should be accompanied by a reduction in the K:Ca balance.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[balance de cationes]]></kwd>
<kwd lng="es"><![CDATA[humedad relativa]]></kwd>
<kwd lng="es"><![CDATA[relaciones iónicas]]></kwd>
<kwd lng="es"><![CDATA[temperatura]]></kwd>
<kwd lng="en"><![CDATA[cation balance]]></kwd>
<kwd lng="en"><![CDATA[relative humidity]]></kwd>
<kwd lng="en"><![CDATA[ionic relations]]></kwd>
<kwd lng="en"><![CDATA[temperature]]></kwd>
</kwd-group>
</article-meta>
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