<?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>S0871-018X2025000200011</article-id>
<article-id pub-id-type="doi">10.19084/rca.41431</article-id>
<title-group>
<article-title xml:lang="pt"><![CDATA[Índice global de produtividade e qualidade das pastagens: Avaliação de sensores na perspetiva da Agricultura de Precisão]]></article-title>
<article-title xml:lang="en"><![CDATA[Global index of pasture productivity and quality: Sensors evaluation from a Precision Agriculture perspective]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Serrano]]></surname>
<given-names><![CDATA[João]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Moral]]></surname>
<given-names><![CDATA[Francisco J.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidade de Évora CHANGE-Global Change and Sustainability Institute MED-Mediterranean Institute for Agriculture, Environment and Developmen]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Portugal</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad de Extremadura Escuela de Ingenierías Industriales Departamento de Expresión Gráfica]]></institution>
<addr-line><![CDATA[Badajoz ]]></addr-line>
<country>Spain</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>09</month>
<year>2025</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>09</month>
<year>2025</year>
</pub-date>
<volume>48</volume>
<numero>2-3</numero>
<fpage>11</fpage>
<lpage>20</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_arttext&amp;pid=S0871-018X2025000200011&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_abstract&amp;pid=S0871-018X2025000200011&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_pdf&amp;pid=S0871-018X2025000200011&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="pt"><p><![CDATA[RESUMO Este estudo avaliou dois sensores próximos complementares, um medidor de prato ascendente (&#8220;Rising Plate Meter&#8221;, RPM) e um sensor ótico ativo (&#8220;Active Optical Sensor&#8221;, AOS) para obter a disponibilidade de proteína bruta (PB) da pastagem em kg ha-1. Este indicador inclui a produtividade, aferida pela altura comprimida (HRPM), e a qualidade, aferida pelo índice de vegetação de diferença normalizada (&#8220;Normalized Difference Vegetation Index&#8221;, NDVI), medida pelo AOS. O trabalho experimental foi desenvolvido numa pastagem de sequeiro biodiversa e consistiu em medições dos sensores, seguidas da recolha de amostras de pastagem realizadas durante o ciclo vegetativo de 2023/2024. Estas amostras foram submetidas a análises laboratoriais para determinar a matéria seca (MS) e a PB da pastagem. As medições dos sensores e os valores das determinações laboratoriais foram usados para desenvolver modelos de estimativa. As melhores correlações entre a PB (kg ha&#8722;1) e o índice de produtividade e qualidade da pastagem (IPQP = HRPM × NDVI) foram obtidas nas fases iniciais do ciclo vegetativo da pastagem (Outono: R2 = 0,86; e Inverno: R2 = 0,74). Os resultados deste estudo mostram o interesse em alargar a base de dados a outros tipos de pastagem e o potencial para o desenvolvimento de ferramentas para apoio à monitorização da evolução da pastagem e à tomada de decisões de gestão do pastoreio (encabeçamentos, suplementação ou rotação de animais entre parques).]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT This study evaluated two complementary electronic sensors: a rising plate meter (RPM) and an active optical sensor (AOS) to obtain the pasture crude protein (CP) in kg ha&#8722;1. This indicator integrates pasture dry matter availability (dry matter (DM) in kg ha&#8722;1) measured by RPM, and pasture quality (measured by AOS). The experimental work was carried out on a dryland biodiverse and consisted of sensor measurements, followed by the collection of pasture samples in the vegetative cycle of 2023/2024. These samples were subjected to laboratory reference analysis to determine pasture DM and CP. Sensor measurements (compressed height (HRPM) in the case of RPM, and normalized difference vegetation index (NDVI) in the case of AOS) and the results of reference laboratory analysis were used to develop prediction models. The best correlations between CP (kg ha&#8722;1) and pasture productivity and quality index (&#8220;PPQI = HRPM × NDVI&#8221;) were obtained in the initial and intermediate phases of the cycle (autumn: R2 = 0.86; and Winter; R2 = 0.74). The results of this study show not only the importance of extending the database to other pasture types in order to enhance the process of feed supplement determination, but also the potential for the research and development of proximal and remote sensing tools to support pasture monitoring and animal production management (stocking rates, supplementation or rotation of animals between parks).]]></p></abstract>
<kwd-group>
<kwd lng="pt"><![CDATA[pastagens de sequeiro]]></kwd>
<kwd lng="pt"><![CDATA[proteína bruta]]></kwd>
<kwd lng="pt"><![CDATA[prato compressor ascendente (RPM)]]></kwd>
<kwd lng="pt"><![CDATA[sensor ótico ativo (AOS)]]></kwd>
<kwd lng="pt"><![CDATA[NDVI]]></kwd>
<kwd lng="en"><![CDATA[dryland pastures]]></kwd>
<kwd lng="en"><![CDATA[crude protein]]></kwd>
<kwd lng="en"><![CDATA[rising plate meter (RPM)]]></kwd>
<kwd lng="en"><![CDATA[active optical sensor (AOS)]]></kwd>
<kwd lng="en"><![CDATA[NDVI]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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