<?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>2071-0054</journal-id>
<journal-title><![CDATA[Revista Ciencias Técnicas Agropecuarias]]></journal-title>
<abbrev-journal-title><![CDATA[Rev Cie Téc Agr]]></abbrev-journal-title>
<issn>2071-0054</issn>
<publisher>
<publisher-name><![CDATA[Universidad Agraria de La Habana]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2071-00542020000300028</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Correlation between Density and Mechanical Resistance of Soil Obtained with Probes of Different Geometries]]></article-title>
<article-title xml:lang="es"><![CDATA[Correlación entre densidad y resistencia mecánica del suelo obtenida con sondas de diferentes geometrías]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ramos-Carbajal]]></surname>
<given-names><![CDATA[Ernesto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Martínez-Rodríguez]]></surname>
<given-names><![CDATA[Arturo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[García de la Figal-Costales]]></surname>
<given-names><![CDATA[Armando E.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hernández-Cuello]]></surname>
<given-names><![CDATA[Geisy]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Autónoma de Chiapas (UNACH) Escuela de Estudios Agropecuarios de Mezcalapa ]]></institution>
<addr-line><![CDATA[Copainala Chiapas]]></addr-line>
<country>México</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Agraria de La Habana (UNAH) Facultad de Ciencias Técnicas Centro de Mecanización Agropecuaria]]></institution>
<addr-line><![CDATA[San José de Las Lajas Mayabeque]]></addr-line>
<country>Cuba</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>09</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>09</month>
<year>2020</year>
</pub-date>
<volume>29</volume>
<numero>3</numero>
<fpage>28</fpage>
<lpage>36</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_arttext&amp;pid=S2071-00542020000300028&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_abstract&amp;pid=S2071-00542020000300028&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_pdf&amp;pid=S2071-00542020000300028&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT An important soil variable is mechanical resistance, a feature that interacts with other soil properties such as bulk density, texture, moisture content and porosity. Hence a number of experimental investigations have been conducted to obtain a probe of better correlation with volumetric density and resistance to penetration. However, so far, there is no precise information on the technical requirements for the design of probes. The objective of this scientific research was determining the type of probe that ensures the correlation levels between volumetric density and resistance to penetration under different moisture conditions for a Ferrallitic Red Lixiviate soil, typical of Cuba. To meet this objective, eight types of probes (five cone-shaped and three wedge-shaped) with different geometric dimensions were designed and an experimental design of 2x3 factorial nature was executed, setting humidity, intermediate (28%) and high (35%), and three levels of volumetric density (1; 1,1 and 1,2 g&#8729;cm-3). As a result of the experimentation, it was obtained that the wedge-shaped prismatic probe with 30o and base area of 520 mm2, presented the highest levels of correlation with the ASAE index (R2 = 0.95) and the volumetric density (R2 = 0.84), for moisture of 28%, resulting in the most accurate geometric form for estimating soil compaction.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Una variable importante del suelo es la resistencia mecánica, característica que interactúa con otras propiedades del suelo como la densidad aparente, la textura, el contenido de humedad y la porosidad. De aquí que un sin número de investigaciones experimentales han sido conducidas a la obtención de la sonda de mejor correlación con la densidad volumétrica y la resistencia a la penetración. No obstante, hasta el momento no se cuenta con información técnica precisa, sobre los requerimientos técnicos, para el diseño de sondas, siendo objetivo de la presente investigación determinar el tipo de sonda que asegure posibles niveles de correlación entre la densidad volumétrica y la resistencia a la penetración bajo diferentes condiciones de humedad para un suelo Ferralítico Rojo Lixiviado, típico de Cuba. Para cumplir este objetivo, se diseñaron, ocho tipos de sondas (cinco con forma de cono y tres con forma de cuña) con diferentes dimensiones geométricas y se ejecutó un diseño experimental de naturaleza factorial 2x3, fijándose dos niveles de humedad, intermedio (28%) y alto (35%), y tres niveles de densidad volumétrica (1; 1,1 y 1,2 g&#8729;cm-3). Como resultado de la experimentación se obtuvo que la sonda prismática en forma de cuña con 30o y área de la base 520 mm2, presentó los mayores niveles de correlación con el índice de cono ASAE (R2 = 0,95) y la densidad volumétrica (R2 = 0,84), para una humedad del 28%, resultando la forma geométrica más acertada para la estimación del grado de compactación del suelo.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Compaction]]></kwd>
<kwd lng="en"><![CDATA[cone index]]></kwd>
<kwd lng="en"><![CDATA[sensors]]></kwd>
<kwd lng="en"><![CDATA[volumetric density]]></kwd>
<kwd lng="es"><![CDATA[Compactación]]></kwd>
<kwd lng="es"><![CDATA[índice de cono]]></kwd>
<kwd lng="es"><![CDATA[sensores]]></kwd>
<kwd lng="es"><![CDATA[densidad volumétrica]]></kwd>
</kwd-group>
</article-meta>
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