<?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>S0871-018X2025000100021</article-id>
<article-id pub-id-type="doi">10.19084/rca.40316</article-id>
<title-group>
<article-title xml:lang="pt"><![CDATA[Calibração de um medidor de prato ascendente na estimativa da produtividade de pastagens biodiversas de sequeiro]]></article-title>
<article-title xml:lang="en"><![CDATA[Calibration of a rising plate meter (RPM) for estimating the productivity of dryland biodiverse pastures]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Serrano]]></surname>
<given-names><![CDATA[João M. P. R.]]></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 Development]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Portugal</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>03</month>
<year>2025</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>03</month>
<year>2025</year>
</pub-date>
<volume>48</volume>
<numero>1</numero>
<fpage>21</fpage>
<lpage>30</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_arttext&amp;pid=S0871-018X2025000100021&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_abstract&amp;pid=S0871-018X2025000100021&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_pdf&amp;pid=S0871-018X2025000100021&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="pt"><p><![CDATA[RESUMO Este estudo avalia um sensor eletrónico, o medidor de prato ascendente, para estimar a produtividade da pastagem em termos de matéria seca (MS, em kg ha&#8722;1). O processo decorreu durante o ciclo vegetativo da pastagem de 2023/2024. Foram recolhidas 192 amostras compósitas de pastagem em duas fases, calibração e validação. A fase de calibração (n = 144) decorreu em três datas (dezembro 2023, fevereiro e maio de 2024). Em cada uma destas datas foram efetuadas medições em 48 áreas de amostragem georreferenciadas num campo experimental de 4 ha, numa pastagem representativa das pastagens permanentes de sequeiro da região Alentejo, constituída por uma mistura de várias espécies botânicas, pastoreada por ovinos. A fase de validação (n = 48) decorreu entre dezembro de 2023 e abril de 2024 no mesmo campo experimental. O melhor modelo de calibração para estimativa da MS foi obtido nas recolhas realizadas em fevereiro de 2024 (R2= 0,82). Os resultados deste estudo exploratório em Portugal abrem perspetivas para outros trabalhos que permitam testar, calibrar e validar este sensor eletrónico numa gama mais ampla de condições de produção de pastagens, procurando aumentar a precisão da estimativa e, com esta, disponibilizar uma ferramenta expedita de apoio à tomada de decisão, nomeadamente, no que se refere à gestão da pastagem e do pastoreio.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT This study evaluates a expedient electronic sensor, a rising plate meter (RPM), to estimate pasture dry matter (DM, in kg ha&#8722;1). The sampling process was carried out throughout the 2023/2024 pasture growing season. A total of 192 composite pasture samples were collected in two phases (calibration and validation). The calibration phase (n = 144) consisted of measurements on three dates (December 2023, February and May 2024). On each of these dates, measurements were carried out in 48 georeferenced sampling areas of a 4 ha experimental field. This pasture is representative of biodiverse permanent dryland pastures of Alentejo, a mixture of various botanical species, grazed by sheep. The validation phase (n = 48) was carried out between December 2023 and April 2024 in the same experimental field. The best estimation model for DM was obtained based on measurements carried out in February 2024 (R2 = 0.82). The results of this exploratory study in Portugal open perspectives for other works that would allow the testing, calibration, and validation of these electronic sensors in a wider range of pasture production conditions, in order to improve their accuracy as decision-making support tools in pasture and grazing management.]]></p></abstract>
<kwd-group>
<kwd lng="pt"><![CDATA[sensores]]></kwd>
<kwd lng="pt"><![CDATA[modelo de previsão]]></kwd>
<kwd lng="pt"><![CDATA[densidade da pastagem]]></kwd>
<kwd lng="pt"><![CDATA[matéria seca]]></kwd>
<kwd lng="en"><![CDATA[sensors]]></kwd>
<kwd lng="en"><![CDATA[estimation model]]></kwd>
<kwd lng="en"><![CDATA[pasture density]]></kwd>
<kwd lng="en"><![CDATA[dry matter]]></kwd>
</kwd-group>
</article-meta>
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