<?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>S0871-018X2020000200001</article-id>
<article-id pub-id-type="doi">10.19084/rca.18658</article-id>
<title-group>
<article-title xml:lang="pt"><![CDATA[Determinação da salinidade e sodicidade do solo por métodos de indução eletromagnética]]></article-title>
<article-title xml:lang="en"><![CDATA[Determination of soil salinity and sodicity using electromagnetic induction]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Paz]]></surname>
<given-names><![CDATA[Ana Marta]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Castanheira]]></surname>
<given-names><![CDATA[Nádia]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gonçalves]]></surname>
<given-names><![CDATA[Maria Conceição]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Fernandes]]></surname>
<given-names><![CDATA[Manuel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pires]]></surname>
<given-names><![CDATA[Fernando]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Farzaminan]]></surname>
<given-names><![CDATA[Mohammad]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Paz]]></surname>
<given-names><![CDATA[Maria Catrina]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Santos]]></surname>
<given-names><![CDATA[Fernando Monteiro]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto Nacional de Investigação Agrária e Veterinária  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Portugal</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidade de Lisboa Faculdade de Ciências Instituto Dom Luiz]]></institution>
<addr-line><![CDATA[Lisboa ]]></addr-line>
<country>Portugal</country>
</aff>
<pub-date pub-type="pub">
<day>30</day>
<month>06</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>30</day>
<month>06</month>
<year>2020</year>
</pub-date>
<volume>43</volume>
<numero>2</numero>
<fpage>1</fpage>
<lpage>20</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_arttext&amp;pid=S0871-018X2020000200001&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_abstract&amp;pid=S0871-018X2020000200001&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_pdf&amp;pid=S0871-018X2020000200001&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="pt"><p><![CDATA[Resumo O excesso de sais solúveis na solução do solo (salinidade) ou a percentagem de sódio no complexo de troca (sodicidade) são fenómenos que levam à degradação das funções do solo. É essencial monitorizar as áreas de risco de forma a prevenir ou mitigar os processos de salinização e os seus efeitos negativos. Os métodos de indução eletromagnética (EMI), aliados a algoritmos de inversão, têm sido usados para analisar o solo em profundidade, de forma não invasiva, medindo a variação vertical da condutividade elétrica do solo (&#963;) a partir da sua superfície e permitindo monitorizar grandes áreas de forma eficiente e representativa. Neste trabalho analisaram-se quatro casos de estudo na Lezíria Grande de Vila Franca de Xira. Foram colhidas amostras de solo até uma profundidade de 135 cm para determinação laboratorial da condutividade elétrica do extrato de saturação (EC  e ), da percentagem de sódio de troca (ESP) e da razão de adsorção de sódio (SAR). Simultaneamente foram feitas medições de &#963; com um sensor EMI (EM38). Obteve-se boa correlação entre &#963; e EC  e , SAR e ESP e foi possível classificar corretamente o solo quanto à salinidade e sodicidade em 88,6% das 89 amostras de solo.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Salinisation phenomena can lead to degradation of the soil functions. In order to prevent or remediate the excess of soluble salts (salinity) and the percentage of sodium in the soils&#8217; exchange complex (sodicity), it is essential to monitor the areas at risk. Electromagnetic induction (EMI) methods coupled with inversion algorithms have been used for non-invasive and in-depth soil analysis determining the vertical variation of the electrical conductivity of bulk soil (&#963;), monitoring large areas efficiently and representatively. This work was carried out at four case studies in Lezíria Grande of Vila Franca de Xira (Lisbon, Portugal). Soil samples were collected to a depth of 135 cm for laboratory determination of the electrical conductivity of the saturated soil paste extract (EC  e ), the exchangeable sodium percentage (ESP) and the sodium adsorption ratio (SAR). Simultaneously, &#963; measurements were made with an EMI device (EM38). Good correlation was obtained between &#963; and EC  e , SAR, and ESP. It was possible to correctly classify the soil according to salinity and sodicity in 88,6% in a total of 89 soil samples.]]></p></abstract>
<kwd-group>
<kwd lng="pt"><![CDATA[salinidade]]></kwd>
<kwd lng="pt"><![CDATA[sodicidade]]></kwd>
<kwd lng="pt"><![CDATA[indução eletromagnética]]></kwd>
<kwd lng="pt"><![CDATA[condutividade elétrica]]></kwd>
<kwd lng="en"><![CDATA[salinity]]></kwd>
<kwd lng="en"><![CDATA[sodicity]]></kwd>
<kwd lng="en"><![CDATA[electromagnetic induction]]></kwd>
<kwd lng="en"><![CDATA[electrical conductivity]]></kwd>
</kwd-group>
</article-meta>
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