<?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>S0871-018X2023000500161</article-id>
<article-id pub-id-type="doi">10.19084/rca.33401</article-id>
<title-group>
<article-title xml:lang="pt"><![CDATA[Modificador de fertilidade do 3-PG em função dos teores de nutrientes do solo]]></article-title>
<article-title xml:lang="en"><![CDATA[3-PG fertility modifier as a function of soil nutrient content]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Nunes]]></surname>
<given-names><![CDATA[Jorge Delgado]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Barreiro]]></surname>
<given-names><![CDATA[Susana]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cortez]]></surname>
<given-names><![CDATA[Nuno]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Tomé]]></surname>
<given-names><![CDATA[Margarida]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidade de Lisboa Centro de Estudos Florestais (CEF) Instituto Superior de Agronomia (ISA)]]></institution>
<addr-line><![CDATA[Lisbon ]]></addr-line>
<country>Portugal</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2023</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2023</year>
</pub-date>
<volume>46</volume>
<numero>sp</numero>
<fpage>161</fpage>
<lpage>170</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_arttext&amp;pid=S0871-018X2023000500161&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_abstract&amp;pid=S0871-018X2023000500161&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_pdf&amp;pid=S0871-018X2023000500161&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="pt"><p><![CDATA[Resumo O 3-PG é um modelo de base fisiológica que tem sido extensamente usado e testado para prever a produtividade primária de povoamento florestais em todo o mundo. A fertilidade do solo é considerada por meio de um índice de fertilidade, valor que varia entre 0 e 1. Este parâmetro de fertilidade tem sido inserido pelo utilizador do modelo baseando-se na sua intuição ou experiência. Tentativas para desenvolver um modelo matemático para obter o valor do índice de fertilidade a partir das características do solo, têm tido resultados contraditórios O presente estudo procura propor um modificador de fertilidade (fN) para o 3-PG, considerando os valores limitantes dos nutrientes no solo em ensaios de acompanhamento de Eucalyptus globulus. Os resultados preliminares indicam uma boa relação, entre o volume de madeira dos povoamentos estudados e os teores de carbono e de boro do solo das diferentes parcelas. Antes de se propor um modificador generalizável para Portugal, será necessário ampliar o número de povoamentos, bem como a sua distribuição regional.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract The 3-PG is a physiologically based model that has been extensively used and tested to predict the primary productivity of forest stands around the world. Soil fertility is considered by means of a fertility index, so-called fertility rating, a value that varies between 0 and 1. This fertility parameter has been inserted by the model user based on his intuition or experience. Attempts to develop a mathematical model to obtain the fertility rating value from soil characteristics have had contradictory results. The present study seeks to propose a fertility modifier (fN) for 3-PG, considering the limiting values of nutrients in soil in Eucalyptus globulus follow-up trials. Preliminary results seem to indicate a good relationship between the wood volume of the studied stands and the carbon and boron contents of the soil in the different plots. Before proposing a generalizable modifier for Portugal, it will be necessary to expand the number of settlements, as well as their regional distribution.]]></p></abstract>
<kwd-group>
<kwd lng="pt"><![CDATA[3-PG]]></kwd>
<kwd lng="pt"><![CDATA[índice de fertilidade]]></kwd>
<kwd lng="pt"><![CDATA[nutrientes]]></kwd>
<kwd lng="pt"><![CDATA[E. globulus]]></kwd>
<kwd lng="en"><![CDATA[3-PG]]></kwd>
<kwd lng="en"><![CDATA[fertility rating]]></kwd>
<kwd lng="en"><![CDATA[soil nutrients]]></kwd>
<kwd lng="en"><![CDATA[E. globulus]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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