<?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>0377-9424</journal-id>
<journal-title><![CDATA[Agronomía Costarricense]]></journal-title>
<abbrev-journal-title><![CDATA[Agron. Costarricense]]></abbrev-journal-title>
<issn>0377-9424</issn>
<publisher>
<publisher-name><![CDATA[Universidad de Costa Rica. Colegio de Ingenieros y Agrónomos. Ministerio de Agricultura y Ganadería]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0377-94242015000300101</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Labranza mecanizada de pasturas mediante tres implementos en un ultisol y sus implicaciones físicas e hidropedológicas]]></article-title>
<article-title xml:lang="en"><![CDATA[Grassland soil tillage by three implements in an Ultisol and its physical and hydropedological implications]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Camacho]]></surname>
<given-names><![CDATA[Manuel E.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mata]]></surname>
<given-names><![CDATA[Rafael]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Forsythe]]></surname>
<given-names><![CDATA[Warren]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de Costa Rica Centro de investigaciones Agronómicas ]]></institution>
<addr-line><![CDATA[ San José]]></addr-line>
<country>CR</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad de Costa Rica Centro de investigaciones Agronómicas ]]></institution>
<addr-line><![CDATA[ San José]]></addr-line>
<country>CR</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad de Costa Rica Centro de investigaciones Agronómicas ]]></institution>
<addr-line><![CDATA[ San José]]></addr-line>
<country>CR</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2015</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2015</year>
</pub-date>
<volume>39</volume>
<fpage>101</fpage>
<lpage>115</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S0377-94242015000300101&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S0377-94242015000300101&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S0377-94242015000300101&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[ResumenMediante un estudio en el campo, se determinó el efecto de la labranza mecanizada con 3 implementos sobre la compactación, las variables físicas e hidropedológicas de un Ultisol dedicado a la ganadería, ubicado en San Mateo, Alajuela. Se seleccionó un lote de aproximadamente 10 000 m2, se dividió en 16 parcelas iguales (650 m2 cada una), y se aleatorizó la mecanización con 3 diferentes implementos correspondientes a los tratamientos, a partir de una parcela y un diseño experimental irrestricto al azar. Como tratamientos se estableció un área sin labranza (T), y labranza mediante un palín mecánico (PM), un arado de cincel (AC) o un subsolador (S). Cuarenta días después de la aplicación de los tratamientos se determinó la resistencia a la penetración cada 5 cm hasta los 50 cm de profundidad, y la humedad gravimétrica, densidad aparente y de partículas, infiltración y conductividad hidráulica fueron evaluadas, todas ellas en los primeros 10 cm de profundidad. Se encontró un descenso en la compactación del suelo, expresada como resistencia a la penetración, para los tratamientos de mecanización, y reportó el tratamiento palín mecánico (PM) con los valores más bajos. Este mismo tratamiento incrementó la infiltración acumulada (38,70±3,60 mm a los 150 min) de manera significativa, al comparar con la obtenida en el tratamiento testigo (0,09±0,02 mm a los 150 min). No se encontró diferencias significativas entre los tratamientos de mecanización para densidad aparente, porosidad y espacio aéreo, pero sí con respecto al tratamiento T. El tratamiento subsolador (S) propició los valores más elevados de conductividad hidráulica, sin diferencias estadísticas del resto de tratamientos (p&gt;0,05).]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[AbstractA field study was conducted to test the effects of soil tillage with 3 different implements on compaction, physical and hydropedological properties of an Ultisol under cattle production, located in San Mateo, Alajuela. An area of approximately 10 000 m2 was selected and divided into 16 plots (650 m2 each) and was tilled with 3 different implements corresponding to the treatments, following an unrestricted random experimental design, with a plot as experimental unit. Soil without tillage (T), tillage by spader plow (PM), tillage by chisel plow (C) or tillage by subsoiler (S) were established as treatments. Forty days after tillage treatments, soil penetration resistance every 5 cm up to 50 cm deep was assessed, and gravimetric moisture content, bulk and particle density, water infiltration and hydraulic conductivity, all of them up to the first 10 cm deep, all of them were measured. Soil compaction, expressed as soil penetration resistance, was reduced by tillage treatments; the lowest values for soil compaction were found in the spader plow treatment (PM). This same treatment enhanced cumulated infiltration (38.70±3.60 mm at 150 min) significantly, comparing with those obtained in T treatment (0.09±0.02 mm at 150 min). No significant differences were found among tillage treatments for bulk density, total porosity and airspace, but comparing with control treatment (T) they were found. Subsoiler treatment (S) favored the highest values for hydraulic conductivity, but no significant differences with the other treatments were found (p&gt;0.05).]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Compactación de suelo]]></kwd>
<kwd lng="es"><![CDATA[infiltración]]></kwd>
<kwd lng="es"><![CDATA[mecanización]]></kwd>
<kwd lng="es"><![CDATA[pasturas]]></kwd>
<kwd lng="es"><![CDATA[Ultisoles]]></kwd>
<kwd lng="es"><![CDATA[Hidropedología]]></kwd>
<kwd lng="en"><![CDATA[Soil compaction]]></kwd>
<kwd lng="en"><![CDATA[infiltration]]></kwd>
<kwd lng="en"><![CDATA[grasslands]]></kwd>
<kwd lng="en"><![CDATA[Ultisols]]></kwd>
<kwd lng="en"><![CDATA[Hydropedology]]></kwd>
</kwd-group>
</article-meta>
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