<?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>0120-0135</journal-id>
<journal-title><![CDATA[Revista de Ciencias Agrícolas]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. Cienc. Agr.]]></abbrev-journal-title>
<issn>0120-0135</issn>
<publisher>
<publisher-name><![CDATA[Universidad de Nariño]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0120-01352021000200144</article-id>
<article-id pub-id-type="doi">10.22267/rcia.213802.163</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Potentialities and limitations of Planosols with distinct depths of diagnostic horizon]]></article-title>
<article-title xml:lang="es"><![CDATA[Potencialidades y limitaciones de Planosoles en distintas profundidades de su horizonte diagnóstico]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gomes Costa]]></surname>
<given-names><![CDATA[Mirian Cristina]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Espíndola Romero]]></surname>
<given-names><![CDATA[Ricardo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Santos Sousa Vieira]]></surname>
<given-names><![CDATA[Juciane Maria]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Shiso Toma]]></surname>
<given-names><![CDATA[Raul]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Anunciato Mota]]></surname>
<given-names><![CDATA[Jaedson Cláudio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidade Federal do Ceará  ]]></institution>
<addr-line><![CDATA[ Ceará]]></addr-line>
<country>Brazil</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidade Federal do Ceará  ]]></institution>
<addr-line><![CDATA[ Ceará]]></addr-line>
<country>Brazil</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidade do Estado de Santa Catarina  ]]></institution>
<addr-line><![CDATA[ Santa Catarina]]></addr-line>
<country>Brazil</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Universidade Federal do Ceará  ]]></institution>
<addr-line><![CDATA[ Ceará]]></addr-line>
<country>Brazil</country>
</aff>
<aff id="Af5">
<institution><![CDATA[,Universidade Federal do Ceará  ]]></institution>
<addr-line><![CDATA[ Ceará]]></addr-line>
<country>Brazil</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2021</year>
</pub-date>
<volume>38</volume>
<numero>2</numero>
<fpage>144</fpage>
<lpage>156</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0120-01352021000200144&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0120-01352021000200144&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0120-01352021000200144&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT There is a variation in the depth of subsurface horizon of Planosols in semi-arid region, which may influence the agricultural potential and affect food production. The general aim of this study was to identify potentialities and limitations of two Planosols as a function of subsurface horizon depth. The adjacent profiles P1 and P2 were studied in Pentecoste (Ceará, Brazil). Morphological, physical, and chemical analyses were done aiming at soil characterization. Soil bulk density (BD), porosity, and penetration resistance (PR) were analyzed in a completely randomized split-plot design with four replicates to compare P1 and P2 and the horizons Ap and Btf. Btf was found at 62cm depth in P1 and at 18 cm depth in P2. Indicatives of water saturation were more evident in P2. The profile P1 showed lower hardness and higher friability, as well as higher acidity in subsurface (pHH2O from 4.4 to 4.7) and higher aluminum content (1.2cmolc kg-1). Both profiles were eutrophic and showed low contents of organic carbon (1.5 to 8.5g kg-1) and phosphorus (0.9 to 3.9mg kg-1). The sodium percentage in CEC was 9.1% in P1 and 5.5% in P2. Water retention increases in Btf compared with Ap was 7.3% in P2 and 2.7% in P1. Both profiles showed increase in BD in Btf, reaching 1.7g cm-3, while PR was higher in P2 (1.5 MPa). There are potentialities and limitations common to both soil profiles, but P1 has more physical potentialities and more chemical limitations than P2.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Existe una variación en la profundidad del horizonte sub superficial de los Planosoles en la región semiárida, que pueden influenciar el potencial agrícola y afectar la producción de alimentos. En este estudio el objetivo general fue identificar las potencialidades y limitaciones de dos Planosoles en función de la profundidad de su horizonte sub superficial. Los perfiles adjacentes P1 y P2 fueron estudiados en Pentecoste (Ceará, Brasil). Con la finalidad de caracterizarlos fueron realizados análisis morfológicos, físicos y químicos. La densidad aparente del suelo (DA), porosidad y resistencia a la penetración (RP) fueron analizados en un diseño experimental completamente al azar con parcelas divididas y cuatro repeticiones para comparar P1 y P2 y los horizontes Ap y Btf. El horizonte Btf fue encontrado a 62 cm de profundidad en el P1 y a 18cm en el P2. Los indicadores de saturación de agua fueron evidentes en P2. El perfil P1 presentó menor dureza, mayor friabilidad, mayor acidez en profundidad (pHH2O de 4.4 a 4.7) y mayor contenido de aluminio (1.2cmolc kg-1). Ambos perfiles presentaron características eutróficas y contenidos bajos de carbono orgánico (1.5 a 8.5g kg-1) y fosforo (0.9 a 3.9mg kg-1). El porcentaje de sodio en la CIC fue de 9.1% en el P1 y 5.5% en el P2. El incremento de la retención de agua en Btf comparado con AP fue 7,3% en P2 y 2,7 en P1. Los dos perfiles mostraron incremento de la DA en el horizonte Btf, alcanzando 1.7g cm-3, mientras que la RP fue mayor en el P2 (1.5 MPa). Existen limitaciones y potencialidades comunes en ambos perfiles de suelo, pero el P1 tiene más potencialidades físicas y más limitaciones químicas que el P2.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Soil classification]]></kwd>
<kwd lng="en"><![CDATA[soil morphology]]></kwd>
<kwd lng="en"><![CDATA[pedology]]></kwd>
<kwd lng="en"><![CDATA[planic B soil horizon]]></kwd>
<kwd lng="en"><![CDATA[tropical soils.]]></kwd>
<kwd lng="es"><![CDATA[clasificación de suelos]]></kwd>
<kwd lng="es"><![CDATA[horizonte B planico]]></kwd>
<kwd lng="es"><![CDATA[morfología de suelos]]></kwd>
<kwd lng="es"><![CDATA[pedología]]></kwd>
<kwd lng="es"><![CDATA[suelos tropicales.]]></kwd>
</kwd-group>
</article-meta>
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