<?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>S0871-018X2020000100032</article-id>
<article-id pub-id-type="doi">10.19084/rca.18659</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Germination and initial growth of crops and weeds in response to Digitaria insularis aqueous extracts]]></article-title>
<article-title xml:lang="pt"><![CDATA[Germinação e crescimento inicial de culturas e plantas daninhas em resposta a extratos aquosos de Digitaria insularis]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ibanhes Neto]]></surname>
<given-names><![CDATA[Helio F.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Marcato]]></surname>
<given-names><![CDATA[Mario H. F.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Marubayashi]]></surname>
<given-names><![CDATA[Rodrigo Y. P.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Takahashi]]></surname>
<given-names><![CDATA[Lúcia S. A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Dalazen]]></surname>
<given-names><![CDATA[Giliardi]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Aff">
<institution><![CDATA[,Centro de Ciências Agrárias Departamento de Agronomia ]]></institution>
<addr-line><![CDATA[Londrina PR]]></addr-line>
<country>Brazil</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>03</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>03</month>
<year>2020</year>
</pub-date>
<volume>43</volume>
<numero>1</numero>
<fpage>32</fpage>
<lpage>56</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_arttext&amp;pid=S0871-018X2020000100032&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_abstract&amp;pid=S0871-018X2020000100032&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_pdf&amp;pid=S0871-018X2020000100032&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: The objective of this study was to evaluate the allelopathy of aqueous Digitaria insularis (sourgrass) extracts on germination and initial growth of cultivated plants and weeds. Three factorial experiments (3x2x3) were carried out, being factor A - the tested plant species: crops - Glycine max (soybean), Zea mays (corn), Phaseolus vulgaris (bean), and weeds - Digitaria horizontalis, Echinochloa crusgalli and Bidens pilosa ; factor B - extracts of roots and shoots of sourgrass and factor C - concentration of the extract - 0, 50 and 100%. Germination percentage and the length of shoots and roots of the tested species were evaluated. Among the crops, there was a reduction in germination only in bean (-12.5%) in response to 50% of the aqueous root extract. The initial development of corn and beans were hampered. No negative effects were observed on soybean. Among the weeds, the most sensitive species was Bidens pilosa, with reductions in germination (-41%), length of shoots (-59%) and root (-84%) when the seeds were exposed to the 100% of the shoot extract of the sourgrass. The other weed species also suffered reductions in at least one of the evaluated variables. Therefore, the allelopathic effect exerted by sourgrass extracts may be related to its great competitiveness with crops, as well as to its dominant character in areas after its introduction.]]></p></abstract>
<abstract abstract-type="short" xml:lang="pt"><p><![CDATA[Resumo: Objetivou-se avaliar a alelopatia de extratos aquosos de Digitaria insularis (capim-amargoso) sobre a germinação e crescimento inicial de culturas e plantas daninhas. Foram realizados três ensaios fatoriais (3x2x3), sendo o fator A as espécies vegetais: - culturas - Glycine max, Zea mays (milho), Phaseolus vulgaris (feijão), e plantas daninhas - Digitaria horizontalis, Echinochloa crusgalli and Bidens pilosa(picão-preto) -, o fator B origem do extrato de Digitaria insularis - raízes e parte aérea (folhas) - e fator C as concentrações de extrato - 0; 50 e 100%. Avaliou-se o percentual de germinação e o comprimento de parte aérea e de raiz das culturas e infestantes acima referidas. Entre as culturas, houve redução na germinação apenas na cultura do feijão (-12,5%) em resposta a 50%. do extrato aquoso radicular de Digitaria insularis O desenvolvimento inicial do milho e do feijão foram prejudicados. Sobre a soja não foram observados efeitos negativos. Entre as plantas daninhas, a espécie mais sensível foi o picão-preto, com reduções na germinação (-41%) e comprimento da parte aérea (-59%) e radicular (-84%) quando as sementes foram expostas a 100% do extrato da parte aérea de Digitaria insularis. As outras espécies de plantas daninhas também apresentaram redução em pelo menos uma das variáveis avaliadas. Em síntese, o efeito alelopático exercido pelo capim-amargoso pode estar relacionado com a sua grande competitividade com as culturas, assim como ao seu caráter dominante em áreas após a sua introdução.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Allelopathy]]></kwd>
<kwd lng="en"><![CDATA[sourgrass]]></kwd>
<kwd lng="en"><![CDATA[interference]]></kwd>
<kwd lng="en"><![CDATA[invasiveness]]></kwd>
<kwd lng="en"><![CDATA[phytotoxicity.]]></kwd>
<kwd lng="pt"><![CDATA[Alelopatia]]></kwd>
<kwd lng="pt"><![CDATA[Capim amargoso]]></kwd>
<kwd lng="pt"><![CDATA[interferência]]></kwd>
<kwd lng="pt"><![CDATA[invasibilidade]]></kwd>
<kwd lng="pt"><![CDATA[aleloquímicos.]]></kwd>
</kwd-group>
</article-meta>
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