<?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>S0871-018X2022000300701</article-id>
<article-id pub-id-type="doi">10.19084/rca.28574</article-id>
<title-group>
<article-title xml:lang="pt"><![CDATA[Modelação do índice de fertilidade do 3-PG em função de características físicas e químicas do solo]]></article-title>
<article-title xml:lang="en"><![CDATA[Modeling the 3-PG fertility rating as a function of soil physical and chemical characteristics]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Delgado]]></surname>
<given-names><![CDATA[Nunes, Jorge]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sofia]]></surname>
<given-names><![CDATA[Oliveira, Tânia]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Nuno]]></surname>
<given-names><![CDATA[Cortez,]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Margarida]]></surname>
<given-names><![CDATA[Tomé,]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidade de Lisboa Instituto Superior de Agronomia Centro de Estudos Florestais]]></institution>
<addr-line><![CDATA[Lisboa ]]></addr-line>
<country>Portugal</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,RAIZ Institituto de Investigação da Floresta e Papel, Herdade de Espirra ]]></institution>
<addr-line><![CDATA[Pegões ]]></addr-line>
<country>Portugal</country>
</aff>
<pub-date pub-type="pub">
<day>30</day>
<month>12</month>
<year>2022</year>
</pub-date>
<pub-date pub-type="epub">
<day>30</day>
<month>12</month>
<year>2022</year>
</pub-date>
<volume>45</volume>
<numero>4</numero>
<fpage>701</fpage>
<lpage>710</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_arttext&amp;pid=S0871-018X2022000300701&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_abstract&amp;pid=S0871-018X2022000300701&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_pdf&amp;pid=S0871-018X2022000300701&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="pt"><p><![CDATA[Resumo Os modelos de base fisiológica são ferramentas científicas úteis, mas não têm sido usados frequentemente na gestão florestal, pois exigem dados detalhados de entrada e não fornecem os resultados necessários para a gestão. O 3-PG (Physiological Principles in Predicting Growth) é um modelo de base fisiológica desenvolvido com a intenção de fazer a ponte entre os modelos empíricos e os modelos de base fisiológica mais complexos. A fertilidade do solo é considerada por meio de um índice de fertilidade, o chamado FR (fertility rating), valor que varia entre 0 e 1, atribuído empiricamente de acordo com as características do local. Embora haja um conhecimento limitado da relação que existe entre o FR e propriedades do solo, alguns esforços têm sido feitos para desenvolver funções relacionando o FR e as características do solo. O presente estudo procura desenvolver um modelo geral para prever o FR a partir das características do solo e testar a possibilidade de fazer o modelo 3-PG sensível a fertilizações. Os resultados preliminares originaram modelos com um bom desempenho ao nível da parcela, mas a primeira tentativa de modelo generalizado não alcançou uma boa capacidade preditiva. Os testes continuam a decorrer de maneira a melhorar a capacidade preditiva dos diferentes modelos.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Process based models are useful scientific tools, but they have not been used frequently in forest management, as they require detailed input data with scarce results for management. The 3-PG (Physiological Principles in Predicting Growth) is a process-based model developed with the intention of bridging the gap between the empirical models and the more complex physiologically based models. Soil fertility is considered through a fertility index, the so-called FR (fertility rating), a value that varies between 0 and 1, empirically attributed according to the characteristics of the place. Although there is limited knowledge of the relationship that exists between FR and soil properties, some efforts have been made to develop functions relating FR and soil characteristics. The present study seeks to develop a general model to predict FR from soil characteristics and to test the possibility of making the 3-PG model sensitive to fertilization. Preliminary results resulted in models with good performance at the plot level, but the first attempt at a generalized model did not achieve good predictive capacity. Tests continue to take place to improve the predictive capacity of the different models.]]></p></abstract>
<kwd-group>
<kwd lng="pt"><![CDATA[3-PG]]></kwd>
<kwd lng="pt"><![CDATA[índice de fertilidade]]></kwd>
<kwd lng="pt"><![CDATA[características do solo]]></kwd>
<kwd lng="pt"><![CDATA[nutrientes]]></kwd>
<kwd lng="pt"><![CDATA[adubação]]></kwd>
<kwd lng="en"><![CDATA[3-PG]]></kwd>
<kwd lng="en"><![CDATA[fertility rating]]></kwd>
<kwd lng="en"><![CDATA[soil characteristics]]></kwd>
<kwd lng="en"><![CDATA[nutrients]]></kwd>
<kwd lng="en"><![CDATA[fertilization]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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