<?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>0187-5779</journal-id>
<journal-title><![CDATA[Terra Latinoamericana]]></journal-title>
<abbrev-journal-title><![CDATA[Terra Latinoam]]></abbrev-journal-title>
<issn>0187-5779</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Mexicana de la Ciencia del Suelo A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0187-57792011000200113</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[EFECTO DE LA LABRANZA DE CONSERVACIÓN SOBRE LAS PROPIEDADES DEL SUELO]]></article-title>
<article-title xml:lang="en"><![CDATA[Conservation Tillage Effects on Soil Properties]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Alonso Báez]]></surname>
<given-names><![CDATA[Moisés]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Aguirre Medina]]></surname>
<given-names><![CDATA[Juan Francisco]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto Nacional de Investigaciones Forestales Agrícolas y Pecuarias Campo Experimental Rosario Izapa ]]></institution>
<addr-line><![CDATA[ Chiapas]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2011</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2011</year>
</pub-date>
<volume>29</volume>
<numero>2</numero>
<fpage>113</fpage>
<lpage>121</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0187-57792011000200113&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0187-57792011000200113&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0187-57792011000200113&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Se realizó un experimento en tres sitios de la región del Soconusco, Chiapas, México: Tapachula (TAP), Tuxtla Chico (TCH) y Frontera Hidalgo (FRA); cuyo objetivo fue evaluar el impacto de la labranza de conservación (cero labranza, CL, y labranza mínima, LM), más labranza convencional (LC) sobre el contenido de la materia orgánica (MO), densidad aparente (&#961;b) y conductividad hidráulica a saturación (Ks) en dos ciclos sucesivos de producción de maíz: temporal y humedad residual. Los experimentos consistieron de tres tratamientos de 0.5 ha: CL, LM y LC; la primera y segunda fecha de siembra en cada sitio (TAP, TCH y FRA) se hicieron los días 10, 20 y 28 de mayo; 20, 25 y 30 de agosto de 2007, respectivamente. En cada tratamiento se determinó la MO inicial (abril, 2007) cada 10 cm hasta 40 cm de profundidad y después cada seis meses (noviembre, 2007 y abril, 2008); la &#961;b y Ks se determinaron sólo al inicio y un año después. En el corto plazo, los análisis estadísticos de impacto de los sistemas de labranza por profundidad sobre la MO detectaron diferencia significativa en los sitios TAP y FRA, y altamente significativa en la profundidad, ya que en todos los sitios se determinó mayor concentración de MO en el estrato de 0 a 20 cm (Tukey, 5%). En relación con las variables &#961;b y Ks no se detectó diferencia estadística significativa.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT An experiment was conducted at three locations in the Soconusco, Chiapas, Mexico: Tapachula (TAP), Tuxtla Chico (TCH) and Frontera Hidalgo (FRA), which objective was to assess the impact of conservation tillage (no tillage, NT, and minimum tillage, MT), and conventional tillage (CT) on the content of organic matter (OM), bulk density (&#961;b) and saturated hydraulic conductivity (Ks) in two successive production cycles of corn: rainfed and residual moisture. The experiment consisted of three treatments of 0.5 ha each: NT, MT, and CT. Planting date at each site (TAP, TCH, and FRA) were May 10, 20 and 28 for rainfed and, August 20, 25 and 30 for year 2007 for residual moisture. Within each treatment, OM was determined every 10 cm until 40 cm deep at the beginning of the experiment (April 2007) and then every six months (November, 2007 and April 2008); the &#961;b and Ks were determined only at the beginning and a year later. In the short term, the statistical analysis of the impact of tillage systems and depth over OM had significant differences in sites TAP and FRA, and highly significant in depth, as in all sites higher concentration of OM in the 0 to 20 cm was determined (Tukey, 0.05). For &#961;b and Ks statistically significant difference was not detected.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[labranza cero]]></kwd>
<kwd lng="es"><![CDATA[labranza mínima]]></kwd>
<kwd lng="es"><![CDATA[labranza convencional]]></kwd>
<kwd lng="es"><![CDATA[región soconusco]]></kwd>
<kwd lng="en"><![CDATA[no tillage]]></kwd>
<kwd lng="en"><![CDATA[minimum tillage]]></kwd>
<kwd lng="en"><![CDATA[conventional tillage]]></kwd>
<kwd lng="en"><![CDATA[soconusco region]]></kwd>
</kwd-group>
</article-meta>
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