<?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>0120-2812</journal-id>
<journal-title><![CDATA[Acta Agronómica]]></journal-title>
<abbrev-journal-title><![CDATA[Acta Agron.]]></abbrev-journal-title>
<issn>0120-2812</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional de Colombia]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0120-28122020000400306</article-id>
<article-id pub-id-type="doi">10.15446/acag.v69n4.88317</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Microbiological attributes of a cultivated Plinthosol with sugarcane on different levels of straw]]></article-title>
<article-title xml:lang="es"><![CDATA[Propiedades microbiológicas de un Plintosol cultivado con caña de azúcar y diferentes niveles de residuos de cosecha]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Torres-Pórtela]]></surname>
<given-names><![CDATA[Mirya Grazielle]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Carvalho-Leite]]></surname>
<given-names><![CDATA[Luiz Fernando]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pires-Barbosa]]></surname>
<given-names><![CDATA[Ranyellson]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Federal de Piauí  ]]></institution>
<addr-line><![CDATA[Teresina ]]></addr-line>
<country>Brazil</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Empresa brasileña de investigación agrícola- Embrapa  ]]></institution>
<addr-line><![CDATA[Teresina ]]></addr-line>
<country>Brazil</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2020</year>
</pub-date>
<volume>69</volume>
<numero>4</numero>
<fpage>306</fpage>
<lpage>313</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0120-28122020000400306&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0120-28122020000400306&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0120-28122020000400306&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract The objective of this work was to evaluate the microbiological attributes of a Plinthossol cropped with sugar cane in straw. The experiment was installed in União (04 ° 51&#8217;09&#8221;S and 42 ° 53&#8217;10 &#8216;&#8217; W, altitude 52 m), northern region of Piauí state, Brazil. The experimental design was randomized blocks, with four replications, and treatments corresponding to different rates of straw (Mg.ha-1) (0, 4.19, 9.54, 13.04 and 18.38). Microbiological attributes were determined at a depth of 0-10 cm. Data was submitted to analysis of variance, cluster analysis and main components. An increase of straw in the soil influenced the stocks and contents of C, Cmic, Nmic, respiration and microbial and metabolic quotients. Cluster analysis combined the treatments into three distinct groups. 9.54 Mg.ha-1 of straw treatment was isolated from other treatments, being strongly correlated to the microbial quotient. The group formed by the treatments 13.04 and 18.38 Mg. ha-1 of straw correlated with most of the evaluated attributes, being the best proportions to be used to improve soil quality.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen El objetivo de este trabajo fue evaluar los atributos microbiológicos de un Plintosol cultivado con caña de azúcar y residuos de cosecha. El experimento se instaló en União (04°51&#8217;09&#8221;S y 42°53&#8217;10&#8217;&#8217; W, altitud 52 m), región norte del estado de Piauí, Brasil. El diseño experimental fue de bloques al azar, con cuatro repeticiones, y tratamientos correspondientes a diferentes cantidades de residuos (0, 4.19, 9.54, 13.04 y 18.38 Mg.ha-1). Los atributos microbiológicos se determinaron a una profundidad de 0-10 cm. Los datos se sometieron a análisis de varianza, análisis de conglomerados y componentes principales. El incremento en los residuos de cosecha en el suelo influyó en el contenido de C, Cmic, Nmic, respiración y cocientes microbianos y metabólicos. El análisis de conglomerados combinó los tratamientos en tres grupos distintos. El tratamiento con 9.54 Mg.ha-1 de residuos fue diferente a los otros tratamientos, estando fuertemente correlacionado con el cociente microbiano. El grupo formado por los tratamientos 13.04 y 18.38 Mg.ha-1 de residuos se correlacionó con la mayoría de los atributos evaluados, siendo las mejores proporciones para ser utilizadas para mejorar la calidad del suelo.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Microorganisms]]></kwd>
<kwd lng="en"><![CDATA[Multivariate]]></kwd>
<kwd lng="en"><![CDATA[Biomass]]></kwd>
<kwd lng="en"><![CDATA[Saccharum offcinarum]]></kwd>
<kwd lng="en"><![CDATA[Soil organic matter]]></kwd>
<kwd lng="es"><![CDATA[Microorganismos]]></kwd>
<kwd lng="es"><![CDATA[Multivariante]]></kwd>
<kwd lng="es"><![CDATA[Biomasa]]></kwd>
<kwd lng="es"><![CDATA[Saccharum officinarum]]></kwd>
<kwd lng="es"><![CDATA[Materia orgánica del suelo]]></kwd>
</kwd-group>
</article-meta>
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