<?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>S0187-57792015000400275</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Efecto de la siembra directa continua sobre el comportamiento físico-funcional de los suelos franco limosos de la región semiárida central de la provincia de Córdoba (Argentina)]]></article-title>
<article-title xml:lang="en"><![CDATA[Effect of continuous zero tillage on the physical-functional behavior of silty loam soils of the semiarid central region of the province of Córdoba (Argentina)]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rollán]]></surname>
<given-names><![CDATA[Adriana Ana del Carmen]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Bachmeier]]></surname>
<given-names><![CDATA[Omar Antonio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional de Córdoba Facultad de Ciencias Agropecuarias Departamento de Recursos Naturales]]></institution>
<addr-line><![CDATA[Córdoba ]]></addr-line>
<country>Argentina</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>33</volume>
<numero>4</numero>
<fpage>275</fpage>
<lpage>284</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0187-57792015000400275&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0187-57792015000400275&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0187-57792015000400275&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: Los suelos franco-limosos se caracterizan por su susceptibilidad a compactarse formando estructuras masivas y homogéneas. El uso de la siembra directa (SD) genera la necesidad de estudiar nuevos aspectos de la degradación física de este tipo de suelos. Por ello, el objetivo de este trabajo fue evaluar el efecto de la SD continua sobre el comportamiento físico y funcional de los suelos franco-limosos de la región semiárida central de la provincia de Córdoba (Argentina). Se determinó el contenido de carbono orgánico (CO), la distribución del tamaño de partículas, la densidad aparente (Dap), la densidad real y la conductividad hidráulica a saturación (Ksat) de 0 a 7 (Prof.1) y de 7 a 14 cm (Prof. 2). El CO de la Prof.1 duplicó a los valores medidos de la Prof.2. La Dap de la Prof.2 fue hasta 20% superior a los correspondientes a la Prof.1. La disminución de los flujos estacionarios en los sitios con menor porosidad, muestran el grado en que los procesos de compactación afectan el movimiento del agua en el suelo e indican la dominancia de los macroporos durante el flujo saturado. En la mayoría de los casos los valores más altos de Ksat estuvieron asociados a los menores valores sat de Dap. La SD continua afectó las características físicas y funcionales de los suelos franco-limosos estudiados. Desde el punto de vista físico la estratificación del CO no compensó la densificación inducida por el sistema de labranza. Desde el punto de vista funcional, la compactación provoca cambios en las propiedades hidráulicas de 0 a 14 cm de profundidad.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: The silty loam soils are characterized by susceptibility to compaction and forming massive homogeneous structures. The use of zero tillage practices (SD) requires exploring new aspects of physical degradation of these soils. Therefore, the aim of this study was to evaluate the effect of continuous SD on the physical-functional behavior of silty loam soils of the semiarid central region of the province of Córdoba (Argentina). Content of organic carbon (OC), particle size distribution, bulk density (Db), particle density and saturated hydraulic conductivity (Ksat) from 0 - 7 (Prof.1) and 7 - 14 cm (Prof.2) were measured. The average silt content was 54 %. In most cases, Prof.1 OC doubled the measured values in Prof.2. Bulk density values of Prof.2 were up to 20 % higher than those for the Prof.1. The decrease in the steady state flow of lower porosity sites shows that the degree of compaction processes affects movement of water in the soil and may indicate dominance of macropores in the saturated water flow. In most cases, higher values of Ksat were associated with the lowest values of Db; this behavior was not widespread. Continuous SD affected the physical and functional characteristics of the silty loam soils studied. From a physical standpoint, stratification of OC did not offset the densification induced by the tillage system. From the functional point of view, compaction causes changes in soil hydraulic properties 0-14 cm deep.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[porosidad]]></kwd>
<kwd lng="es"><![CDATA[compactación]]></kwd>
<kwd lng="es"><![CDATA[densidad aparente]]></kwd>
<kwd lng="es"><![CDATA[conductividad hidráulica]]></kwd>
<kwd lng="en"><![CDATA[soil porosity]]></kwd>
<kwd lng="en"><![CDATA[compaction]]></kwd>
<kwd lng="en"><![CDATA[bulk density]]></kwd>
<kwd lng="en"><![CDATA[hydraulic conductivity]]></kwd>
</kwd-group>
</article-meta>
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