<?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>0304-2847</journal-id>
<journal-title><![CDATA[Revista Facultad Nacional de Agronomía Medellín]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. Fac. Nac. Agron. Medellín]]></abbrev-journal-title>
<issn>0304-2847</issn>
<publisher>
<publisher-name><![CDATA[Facultad de Ciencias Agrarias - Universidad Nacional de Colombia]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0304-28472024000310811</article-id>
<article-id pub-id-type="doi">10.15446/rfnam.v77n3.109829</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Soil quality indicators related to the deterioration of Kikuyu grass Cenchrus clandestinus (Hochst. ex Chiov.) Morrone]]></article-title>
<article-title xml:lang="es"><![CDATA[Indicadores de calidad del suelo relacionados con el deterioro del pasto kikuyo Cenchrus clandestinus (Hochst. ex Chiov.) Morrone]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Noreña-Grisales]]></surname>
<given-names><![CDATA[Jorge Mario]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ramírez Pisco]]></surname>
<given-names><![CDATA[Ramiro]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Osorio Vega]]></surname>
<given-names><![CDATA[Nelson Walter]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional de Colombia Sede Medellín ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2024</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2024</year>
</pub-date>
<volume>77</volume>
<numero>3</numero>
<fpage>10811</fpage>
<lpage>10825</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0304-28472024000310811&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0304-28472024000310811&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0304-28472024000310811&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT Inadequate grassland management has resulted in the degradation of extensive areas, loss of productivity and sustainability of many of them, reflecting a common reality among livestock farmers in Colombia. Therefore, at the Paysandú Agricultural Station of the Universidad Nacional de Colombia, located in the Santa Elena township of the city of Medellín, a study was carried out to determine a soil quality index (SQI) by evaluating the physical and chemical indicators that were most related to the deterioration and dry matter production of kikuyu grass (Cenchrus clandestinus). A minimum data set (MDS) was established for the most sensitive indicators, selected by principal component analysis (PCA), and a nonlinear scoring function was used to obtain the SQI. Statistical differences were found between all the treatments in relation to dry matter production (P&lt;0.05: 1.91x10-32). The most sensitive indicators were bulk density BD &gt; total porosity TP &gt; macropores MAC &gt; micropores MIC &gt; penetration resistance PR &gt; effective cation exchange capacity ECEC &gt; pH. As a result, the following formula was obtained: SQI = (0.225×BD) + (0.224×TP) + (0.220×MAC) + (0.218×MIC) + (0.113×PR) + (0.0879×ECEC) + (0.0877×pH). This index should be tested in kikuyu grass-dominated pastures located in the Colombian high tropics. The baseline is critical at values &gt; 0.58 Mg m-3 for BD and &gt; 2.25 MPa for PR. In addition, the optimum pH range for kikuyu grass development was between 5.4 and 6.4.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN El manejo inadecuado de los pastizales ha provocado la degradación de extensas áreas, la pérdida de productividad y sostenibilidad de muchas de ellas, reflejando una realidad común entre los ganaderos de Colombia. Por ello, en la Estación Agraria Paysandú de la Universidad Nacional de Colombia, ubicada en el corregimiento de Santa Elena de la ciudad de Medellín, se realizó una investigación para determinar un índice de calidad del suelo (SQI) mediante la evaluación de los indicadores físicos y químicos más relacionados con el deterioro y producción de materia seca del pasto kikuyo (Cenchrus clandestinus). Se estableció un conjunto mínimo de datos (MDS) para los indicadores más sensibles, elegidos mediante el análisis de componentes principales PCA, y se utilizó una función de puntuación no lineal para obtener el SQI. Se encontraron diferencias estadísticas entre todos los tratamientos y la producción de materia seca (P&lt;0,05: 1,91x10-32). Los indicadores más sensibles fueron: densidad aparente DR &gt; porosidad total TP &gt; macroporos MAC &gt; microporos MIC &gt; resistencia a la penetración PR &gt; capacidad de intercambio catiónico efectiva ECEC &gt; pH. Como resultado, se obtuvo el siguiente SQI = (0,225×BD) + (0,224×TP) + (0,220×MAC) + (0,218×MIC) + (0,113×PR) + (0,0879×ECEC) + (0,0877×pH). Se sugiere probar el índice en praderas dominadas por pasto kikuyo ubicadas en el trópico alto colombiano. La línea de base es crítica a valores &gt; 0,58 Mg m-3 para BD y &gt; 2,25 MPa para PR. Además, el intervalo de pH óptimo para el desarrollo del pasto kikuyo se situó entre 5,4 y 6,4.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Pasturas degradadas]]></kwd>
<kwd lng="es"><![CDATA[Trópico alto andino]]></kwd>
<kwd lng="es"><![CDATA[Análisis de componentes principales]]></kwd>
<kwd lng="es"><![CDATA[Propiedades químicas del suelo]]></kwd>
<kwd lng="es"><![CDATA[Propiedades físicas del suelo]]></kwd>
<kwd lng="es"><![CDATA[Índice de calidad del suelo]]></kwd>
<kwd lng="en"><![CDATA[Degraded pastures]]></kwd>
<kwd lng="en"><![CDATA[High Andean tropics]]></kwd>
<kwd lng="en"><![CDATA[Principal component analysis]]></kwd>
<kwd lng="en"><![CDATA[Soil chemical properties]]></kwd>
<kwd lng="en"><![CDATA[Soil physical properties]]></kwd>
<kwd lng="en"><![CDATA[Soil quality index]]></kwd>
</kwd-group>
</article-meta>
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