<?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>1405-3195</journal-id>
<journal-title><![CDATA[Agrociencia]]></journal-title>
<abbrev-journal-title><![CDATA[Agrociencia]]></abbrev-journal-title>
<issn>1405-3195</issn>
<publisher>
<publisher-name><![CDATA[Colegio de Postgraduados]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1405-31952007000700723</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Habilitación de un tepetate por efecto de mejoradores biológicos]]></article-title>
<article-title xml:lang="en"><![CDATA[Tepetate habilitation by effect of biological improvers]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[García-Cruz]]></surname>
<given-names><![CDATA[Aleida]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Flores-Román]]></surname>
<given-names><![CDATA[David]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[García-Calderón]]></surname>
<given-names><![CDATA[Norma E.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ferrera-Cerrato]]></surname>
<given-names><![CDATA[Ronald]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Velázquez-Rodríguez]]></surname>
<given-names><![CDATA[Alma S.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,UNAM Instituto de Geología Posgrado en Ciencias Biológicas]]></institution>
<addr-line><![CDATA[ D. F.]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,UNAM Instituto de Geología ]]></institution>
<addr-line><![CDATA[ D. F.]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,UNAM Facultad de Ciencias ]]></institution>
<addr-line><![CDATA[ D. F.]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Colegio de Postgraduados Campus Montecillo ]]></institution>
<addr-line><![CDATA[Montecillo Estado de México]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af5">
<institution><![CDATA[,UAEM Facultad de Ciencias ]]></institution>
<addr-line><![CDATA[Toluca Estado de México]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>11</month>
<year>2007</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>11</month>
<year>2007</year>
</pub-date>
<volume>41</volume>
<numero>7</numero>
<fpage>723</fpage>
<lpage>731</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-31952007000700723&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-31952007000700723&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-31952007000700723&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: En México uno de los principales problemas es la degradación del suelo debido al cambio de su uso como tierras de cultivo; este cambio ocasiona un deterioro que puede llegar a la pérdida total y el afloramiento del tepetate. Los tepetates son capas endurecidas de origen volcánico en zonas del Eje Neovolcánico Transmexicano, presentan bajos porcentajes de materia orgánica y nutrimentos, y una estructura masiva, lo que los hace impermeables y limita el crecimiento de las plantas. El objetivo de este estudio fue evaluar el efecto de tres enmiendas orgánicas, una especie vegetal (Ficus carica L.), micorriza (Glomus spp) y tiempo, en las características físicas y químicas de un tepetate fragmentado. El diseño experimental fue completamente al azar con un arreglo factorial de tratamientos (4×3×2) con los siguientes factores y nivieles: 1) la enmienda (sin enmienda, composta, vermicomposta y estiércol); 2) higuera (sin planta, con planta y planta más inóculo): 3) tiempo (6 y 12 meses). La aplicación de materia orgánica, la higuera y la micorriza favorecieron la formación de agregados a partir de tepetate y su estabilidad. El pH, la CIC, el contenido de materia orgánica y los cationes intercambiables del tepetate se modificaron favorablemente y permitieron el desarrollo de la higuera. Los cambios en las características físicas y químicas del tepetate por adición de enmiendas, el tiempo y la higuera favorecen su habilitación e incorporación a la productividad.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: One of the main problems in México is soil degradation due to the change of its use as cropland; this change causes deterioration, which may lead to total loss and outcrop of tepetate. Tepetates are hardened layers of volcanic origin in zones of the Trans-Mexican Volcanic Belt; they present low percentages of organic matter and of nutrients, and a massive structure, which makes them impermeable and limits plant growth. The objective of this study was to evaluate the effect of three organic amendments, one vegetal species (Ficus carica L.), mycorrhiza (Glomus spp), and time, on the physical and chemical characteristics of a fragmented tepetate. The experimental design was completely randomized with a 4×3×2 factorial arrangement of treatments with the following factors and levels: 1) amendment (without amendment, compost, vermicompost, and manure), 2) fig tree (without plant, with plant, and plant plus inoculum); time (6 and 12 months). Application of organic matter, fig tree, and mycorrhiza favored the formation of aggregates from tepetate and their stability. The pH, CIC, content of organic matter, and exchangeable cations of tepetate were favorably modified and allowed developing of the fig tree. The changes in physical and chemical characteristics of tepetate through addition of amendments, time, and fig tree, favor its habilitation and incorporation to productivity.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Ficus carica L.]]></kwd>
<kwd lng="es"><![CDATA[agregación]]></kwd>
<kwd lng="es"><![CDATA[composta]]></kwd>
<kwd lng="es"><![CDATA[estabilidad]]></kwd>
<kwd lng="es"><![CDATA[estiércol]]></kwd>
<kwd lng="es"><![CDATA[vermicomposta]]></kwd>
<kwd lng="en"><![CDATA[Ficus carica L.]]></kwd>
<kwd lng="en"><![CDATA[aggregation]]></kwd>
<kwd lng="en"><![CDATA[compost]]></kwd>
<kwd lng="en"><![CDATA[stability]]></kwd>
<kwd lng="en"><![CDATA[manure]]></kwd>
<kwd lng="en"><![CDATA[vermicompost]]></kwd>
</kwd-group>
</article-meta>
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