<?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>S0871-018X2020000400021</article-id>
<article-id pub-id-type="doi">10.19084/rca.20746</article-id>
<title-group>
<article-title xml:lang="pt"><![CDATA[Adubação fosfatada na produtividade e qualidade de raízes tuberosas de cultivares de mandioca na savana amazônica, Brasil]]></article-title>
<article-title xml:lang="en"><![CDATA[Phosphorus fertilizer in the yield and quality of tuberous roots of cassava cultivars in the Amazonian savanna, Brazil]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Uchôa]]></surname>
<given-names><![CDATA[Sandra C. P.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Nascimento]]></surname>
<given-names><![CDATA[Fernanda R. do]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Alves]]></surname>
<given-names><![CDATA[José M. A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Melo]]></surname>
<given-names><![CDATA[Valdinar Ferreira]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Silva]]></surname>
<given-names><![CDATA[Deyse C. O. da]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Silva]]></surname>
<given-names><![CDATA[Armando J. da]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Batista]]></surname>
<given-names><![CDATA[Karine D.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Matos]]></surname>
<given-names><![CDATA[Kedma da S.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Albuquerque]]></surname>
<given-names><![CDATA[José de A. A. de]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidade Federal de Roraima  ]]></institution>
<addr-line><![CDATA[Boa Vista RR]]></addr-line>
<country>Brazil</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Serviço Nacional de Aprendizagem Rural  ]]></institution>
<addr-line><![CDATA[Boa Vista RR]]></addr-line>
<country>Brazil</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Empresa Brasileira de Pesquisa Agropecuária  ]]></institution>
<addr-line><![CDATA[Boa Vista RR]]></addr-line>
<country>Brazil</country>
</aff>
<pub-date pub-type="pub">
<day>30</day>
<month>12</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>30</day>
<month>12</month>
<year>2020</year>
</pub-date>
<volume>43</volume>
<numero>4</numero>
<fpage>21</fpage>
<lpage>41</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_arttext&amp;pid=S0871-018X2020000400021&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_abstract&amp;pid=S0871-018X2020000400021&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_pdf&amp;pid=S0871-018X2020000400021&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="pt"><p><![CDATA[RESUMO A produtividade de mandioca no Brasil, em 2019, foi de 18 t ha-1, muito aquém do seu potencial. O fósforo é um nutriente determinante da produtividade e encontra-se em níveis muito baixos em solos tropicais. Assim, objetivou-se com este trabalho avaliar doses de fósforo na produtividade e qualidade de raízes tuberosas de cultivares de mandioca na savana amazônica. O experimento foi instalado no delineamento experimental de blocos casualizados, em esquema de parcelas subdivididas, com 4 repetições. Nas parcelas foram aleatorizadas cinco doses de fósforo (0, 45, 90, 180 e 360 kg ha-1 de P2O5) e nas subparcelas duas cultivares de mandioca (Aciolina e Amazonas). Aos 12 meses de cultivo, as raízes tuberosas foram colhidas e avaliadas. O teor de ácido cianídrico não foi influenciado pelos fatores em estudo. O índice de colheita foi dependente, apenas, das cultivares, sendo superior na cv. Amazonas. A cv. Amazonas foi mais produtiva (86 t ha-1), porém, menos eficiente na utilização do P. A produtividade das cultivares Aciolina e Amazonas foram incrementadas em 125 e 82%, até as doses de máxima eficiência técnica de 192 e 208 kg ha-1 de P2O5, respectivamente. Portanto, a adubação fosfatada é uma boa opção para o cultivo da mandioca.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT In 2019, cassava productivity in Brazil was 18 t ha-1, well below its potential. Phosphorus is a nutrient that determines productivity and is found at very low levels in tropical soils. Thus, the objective of this work was to evaluate phosphorus doses in the yield and quality of tuberous roots of cassava cultivars in the Amazonian savanna. The experiment was installed in a randomized block design, in a split-plot scheme, with 4 replications. In the plots, five doses of phosphorus were randomized: 0, 45, 90, 180 and 360 kg ha-1 de P2O5 and in the subplots two cultivars (Aciolina and Amazonas). At 12 months the plants were harvested and the effect of treatments was evaluated. The HCN content was not influenced by the factors under study. The CI was dependent only on the cultivars, being higher in cv. Amazonas. The cv. Amazonas was more productive (86 t ha-1), but less efficient in the use of P. The productivity of the cultivars Aciolina and Amazonas were increased by 125 and 82%, up to the doses of maximum technical efficiency of 192 and 208 kg ha-1 de P2O5, respectively. Therefore, phosphate fertilization is a good option for the cultivation of cassava.]]></p></abstract>
<kwd-group>
<kwd lng="pt"><![CDATA[Manihot esculenta Crantz]]></kwd>
<kwd lng="pt"><![CDATA[Dose técnica]]></kwd>
<kwd lng="pt"><![CDATA[Dose econômica]]></kwd>
<kwd lng="pt"><![CDATA[P2O5]]></kwd>
<kwd lng="en"><![CDATA[Manihot esculenta Crantz]]></kwd>
<kwd lng="en"><![CDATA[Technical dose]]></kwd>
<kwd lng="en"><![CDATA[Economic dose]]></kwd>
<kwd lng="en"><![CDATA[P2O5]]></kwd>
</kwd-group>
</article-meta>
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