<?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>0871-018X</journal-id>
<journal-title><![CDATA[Revista de Ciências Agrárias]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. de Ciências Agrárias]]></abbrev-journal-title>
<issn>0871-018X</issn>
<publisher>
<publisher-name><![CDATA[Sociedade de Ciências Agrárias de Portugal]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0871-018X2023000100031</article-id>
<article-id pub-id-type="doi">10.19084/rca.27204</article-id>
<title-group>
<article-title xml:lang="pt"><![CDATA[Fertilizante potássico aumenta a condutividade elétrica do solo e diminui a produtividade, pigmentos fotossintéticos e níveis de magnésio foliar na cana-de-açúcar]]></article-title>
<article-title xml:lang="en"><![CDATA[Potassium fertilizer increases soil electrical conductivity and decreases productivity, photosynthetic pigments and magnesium leaf levels in sugarcane]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rocha]]></surname>
<given-names><![CDATA[Igor T. M. da]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Silva]]></surname>
<given-names><![CDATA[Anibia V. da]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Freire]]></surname>
<given-names><![CDATA[Fernando J.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Oliveira]]></surname>
<given-names><![CDATA[Emídio C. A. de]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Souza]]></surname>
<given-names><![CDATA[Edivan R. de]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Endres]]></surname>
<given-names><![CDATA[Laurício]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Federal Rural University of Pernambuco - UFRPE Agronomy department ]]></institution>
<addr-line><![CDATA[Recife Pernambuco]]></addr-line>
<country>Brazil</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Federal Institute of Pernambuco - IFPE Agronomy department ]]></institution>
<addr-line><![CDATA[Vitória do Santo Antão Pernambuco]]></addr-line>
<country>Brazil</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Federal University of Alagoas - UFAL Agronomy department ]]></institution>
<addr-line><![CDATA[Maceió Alagoas]]></addr-line>
<country>Brazil</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>03</month>
<year>2023</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>03</month>
<year>2023</year>
</pub-date>
<volume>46</volume>
<numero>1</numero>
<fpage>31</fpage>
<lpage>40</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_arttext&amp;pid=S0871-018X2023000100031&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_abstract&amp;pid=S0871-018X2023000100031&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_pdf&amp;pid=S0871-018X2023000100031&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="pt"><p><![CDATA[Resumo A fertilização potássica (K+) é muito necessária para o aumento da produtividade de cana-de-açúcar. Por outro lado, o uso de altas doses de K+ pode promover efeitos negativos nas plantas e, consequentemente, diminuir a produtividade. Este estudo avaliou a aplicação de doses de K2O na prolina, pigmentos fotossintéticos (clorofila a, b, total e carotenóides), teores foliares de K+, enxofre (S) e magnésio (Mg), e na produtividade da cana-de-açúcar. Um experimento de campo foi realizado em solo franco-arenoso com seis doses de K2O (0; 25; 50; 100; 200 e 250 kg ha-1), na forma de cloreto de potássio (KCl), e uma variedade de cana-de-açúcar (RB 992506) no ciclo da cana-planta. O experimento foi conduzido em blocos casualizados com quatro repetições. As doses de K2O, na forma de KCl, promoveram aumento linear da condutividade elétrica do solo (CEsolo), nos níveis foliares de K+ e S e diminuição linear nos níveis de Mg. As doses de K2O 147, 128, 135 e 150 kg ha-1 promoveram os maiores teores de clorofila total, carotenóides, prolina e produtividade, respectivamente. A partir dessas doses houve diminuição dessas variáveis. A CEsolo associada com a máxima produtividade da cana-de-açúcar, 150 kg ha-1 de K2O, foi de 1.38 dSm-1. A adubação potássica não deve ultrapassar 150 kg ha-1 de K2O, na forma de KCl, devido aos seus efeitos negativos na produtividade e, também, nos níveis foliares de clorofila total, carotenóides, prolina e Mg em razão do aumento da CE do solo.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Potassium (K+) fertilization is very necessary for optimal productivity. On the other hand, the use of high doses of K+ can promote negative effects on plants and, thus, decrease sugarcane productivity. This study evaluated the application of K2O rates on proline, photosynthetic pigments (chlorophyll a, b, total and carotenoids), leaf levels of K+, sulphur (S) and magnesium (Mg), and on sugarcane productivity. A field experiment was carried out in a sand loam soil with six doses of K2O (0; 25; 50; 100; 200 and 250 kg ha-1), as potassium chloride (KCl), and one sugarcane variety (RB 992506) in the plant cane cycle. The experiment was carried out in randomized blocks design with four replications. The K2O rates, as KCl, promoted a linear increase in the soil electrical conductivity (soil EC), in K+ and S and linear decrease in Mg leaf levels. The K2O rates 147, 128, 135 and 150 kg ha-1 promoted the highest levels of total chlorophyll, carotenoids, proline and productivity, respectively. From these rates on there were decrease in these variables. The soil EC associated with maximum sugarcane productivity, 150 kg ha-1 of K2O, was 1.38 dSm-1. The potassium fertilization should not exceed 150 kg ha-1 K2O, as KCl, due to its negative effects on productivity and, also, on total chlorophyll, carotenoids, proline and Mg leaf levels due to increase in soil EC.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Saccharum spp.]]></kwd>
<kwd lng="en"><![CDATA[chlorophyll]]></kwd>
<kwd lng="en"><![CDATA[Mg antagonism]]></kwd>
<kwd lng="en"><![CDATA[proline]]></kwd>
<kwd lng="en"><![CDATA[Soil electrical conductivity.]]></kwd>
<kwd lng="pt"><![CDATA[Saccharum spp.]]></kwd>
<kwd lng="pt"><![CDATA[clorofila]]></kwd>
<kwd lng="pt"><![CDATA[antagonismo do Mg]]></kwd>
<kwd lng="pt"><![CDATA[prolina]]></kwd>
<kwd lng="pt"><![CDATA[Condutividade elétrica do solo.]]></kwd>
</kwd-group>
</article-meta>
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