<?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>2305-0683</journal-id>
<journal-title><![CDATA[Investigación Agraria]]></journal-title>
<abbrev-journal-title><![CDATA[Investig. Agrar.]]></abbrev-journal-title>
<issn>2305-0683</issn>
<publisher>
<publisher-name><![CDATA[Facultad de Ciencias Agrarias, UNA.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2305-06832021000100008</article-id>
<article-id pub-id-type="doi">10.18004/investig.agrar.2021.junio.2301657</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Análisis espacial de propiedades físicas del suelo de la Hoya del río Suárez, Boyacá - Santander (Colombia), utilizando componentes principales]]></article-title>
<article-title xml:lang="en"><![CDATA[Spatial analysis of soil physical properties in the Suárez river watershed, Boyacá - Santander (Colombia), using principal component analysis]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vargas Diaz]]></surname>
<given-names><![CDATA[Ruy Edeymar]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Galindo Pacheco]]></surname>
<given-names><![CDATA[Julio Ricardo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Henao]]></surname>
<given-names><![CDATA[Ramón Giraldo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Corporación colombiana de investigación agropecuaria (AGROSAVIA)  ]]></institution>
<addr-line><![CDATA[Cundinamarca ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional de Colombia Facultad de Ciencias ]]></institution>
<addr-line><![CDATA[Bogotá ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2021</year>
</pub-date>
<volume>23</volume>
<numero>1</numero>
<fpage>8</fpage>
<lpage>16</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.iics.una.py/scielo.php?script=sci_arttext&amp;pid=S2305-06832021000100008&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.iics.una.py/scielo.php?script=sci_abstract&amp;pid=S2305-06832021000100008&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.iics.una.py/scielo.php?script=sci_pdf&amp;pid=S2305-06832021000100008&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN El uso de técnicas estadísticas multivariadas como el análisis de componentes principales permite resumir un grupo numeroso de variables en unas pocas que recogen un alto porcentaje de la variabilidad total. En este trabajo, se utilizó dicha técnica combinada con las herramientas de geoestadística para analizar el comportamiento conjunto de las propiedades físicas del suelo en la Hoya del río Suárez en relación con el uso de la tierra en agricultura. Se consideraron cinco variables físicas, como son: el porcentaje de arenas, el diámetro medio ponderado de los agregados, la capacidad de retención de agua disponible, la densidad aparente y la densidad real. Esta información se obtuvo de la base de datos de la hoya citada, que incluyó 932 puntos de observación de una grilla de 70x70 m sobre el terreno. Con las variables citadas se aplicó el análisis de componentes principales, y con los componentes más relevantes se realizó el análisis de variabilidad espacial. Se observó que el primer componente principal explicó el 40,5% de la varianza total de las características físicas evaluadas, asociándolo a procesos de compactación del suelo en la región de estudio, mientras que el segundo componente explicó el 21,7% de la varianza total, ligándose a la posible susceptibilidad del suelo a la erosión. Con estos componentes y el análisis espacial se elaboraron mapas que permitieron caracterizar las zonas de la hoya en estudio por problemas de compactación y erodabilidad, lo cual permitirá a futuro proponer esquemas diferenciales de prácticas de conservación del suelo.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT The principal component analysis is a multivariate statistical procedure used to reduce a set of numerous variables into a few ones that can explain a great percentage of the original variability. In this article, the principal component analysis combined with geostatistical tools were used to characterize different zones from the watershed known as &#8220;Hoya del río Suarez&#8221;, for differential agricultural management. Five physical properties were used from the watershed database: sand content in percentage, mean weighted diameter of soil aggregates, available water holding capacity, bulk density and particle density. There were used 932 points of observations from a grid of 70x70 m on the terrain. The two first principal components were used in the analysis of spatial variability. The first component was associated with the soil compaction, and it explained 40.5% of the total variance of the physical variable set. The second component was associated with soil erodibility, and it explained 21.7% of the total variance. The maps built using these components were useful to characterize the watershed soils for compaction and erodibility problems. This result will be useful to propose differential soil conservation management practices.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[análisis multivariado]]></kwd>
<kwd lng="es"><![CDATA[kriging]]></kwd>
<kwd lng="es"><![CDATA[variabilidad espacial]]></kwd>
<kwd lng="en"><![CDATA[multivariate analysis]]></kwd>
<kwd lng="en"><![CDATA[kriging]]></kwd>
<kwd lng="en"><![CDATA[spatial variability]]></kwd>
</kwd-group>
</article-meta>
</front><back>
<ref-list>
<ref id="B1">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Aldas Manzano]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Jiménez]]></surname>
<given-names><![CDATA[E. U.]]></given-names>
</name>
</person-group>
<source><![CDATA[Análisis Multivariante Aplicado con R]]></source>
<year>2017</year>
<publisher-loc><![CDATA[Madrid ]]></publisher-loc>
<publisher-name><![CDATA[Ediciones Paraninfo]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B2">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Anderson]]></surname>
<given-names><![CDATA[T. W.]]></given-names>
</name>
</person-group>
<source><![CDATA[An Introduction to Multivariate Statistical Analysis]]></source>
<year>2003</year>
<publisher-loc><![CDATA[Ney Jersey ]]></publisher-loc>
<publisher-name><![CDATA[John Wiley &amp; Sons]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B3">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Blanco Sepúlveda]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[La relación entre la densidad aparente y la resistencia mecánica como indicadores de la compactación del suelo]]></article-title>
<source><![CDATA[Agrociencia]]></source>
<year>2009</year>
<volume>43</volume>
<numero>3</numero>
<issue>3</issue>
<page-range>231-9</page-range></nlm-citation>
</ref>
<ref id="B4">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Bowman]]></surname>
<given-names><![CDATA[A. W.]]></given-names>
</name>
<name>
<surname><![CDATA[Azzalini]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
</person-group>
<source><![CDATA[R package sm: nonparametric smoothing methods]]></source>
<year>2014</year>
<publisher-name><![CDATA[University of Glasgow and Universitá di Padova]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B5">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Burbano Orjuela]]></surname>
<given-names><![CDATA[H.]]></given-names>
</name>
<name>
<surname><![CDATA[Silva Mojica]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
</person-group>
<source><![CDATA[Ciencia del Suelo: Principios Básicos]]></source>
<year>2010</year>
<publisher-loc><![CDATA[Bogotá ]]></publisher-loc>
<publisher-name><![CDATA[Sociedad Colombiana de la Ciencia del Suelo]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B6">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Ghaemi]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Astaraei]]></surname>
<given-names><![CDATA[A. R.]]></given-names>
</name>
<name>
<surname><![CDATA[Emami]]></surname>
<given-names><![CDATA[H.]]></given-names>
</name>
<name>
<surname><![CDATA[Nassiri Mahalati]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Sanaeinejad]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Determining soil indicators for soil sustainability assessment using principal component analysis of astan quds-east of mashhad-iran]]></article-title>
<source><![CDATA[Journal of Soil Science and Plant Nutrition]]></source>
<year>2014</year>
<volume>14</volume>
<numero>4</numero>
<issue>4</issue>
<page-range>1005-20</page-range></nlm-citation>
</ref>
<ref id="B7">
<nlm-citation citation-type="book">
<collab>IGAC</collab>
<source><![CDATA[Métodos analíticos del laboratorio de suelos]]></source>
<year>2006</year>
<edition>6° ed</edition>
<publisher-loc><![CDATA[Bogotá ]]></publisher-loc>
<publisher-name><![CDATA[IGAC]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B8">
<nlm-citation citation-type="book">
<collab>IGAC</collab>
<source><![CDATA[Estudio General de Suelos y Zonificación de Tierras del Departamento de Boyacá]]></source>
<year>2005</year>
<publisher-loc><![CDATA[Colombia ]]></publisher-loc>
<publisher-name><![CDATA[IGAC]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B9">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Insuasty Burbano]]></surname>
<given-names><![CDATA[O. I.]]></given-names>
</name>
<name>
<surname><![CDATA[Manrique]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Palacio]]></surname>
<given-names><![CDATA[O.]]></given-names>
</name>
</person-group>
<source><![CDATA[Catálogo de Variedades de Caña para la Producción de Panela en la Hoya del Río Suárez]]></source>
<year>2003</year>
<publisher-loc><![CDATA[Bucaramanga, Colombia ]]></publisher-loc>
<publisher-name><![CDATA[Litografía La Bastilla Ltda.]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B10">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Kooch]]></surname>
<given-names><![CDATA[Y.]]></given-names>
</name>
<name>
<surname><![CDATA[Jalilvand]]></surname>
<given-names><![CDATA[H.]]></given-names>
</name>
<name>
<surname><![CDATA[Bahmanyar]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Pormajidian]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[The use of principal component analysis in studying physical, chemical and biological soil properties in southern caspian forests (north of Iran)]]></article-title>
<source><![CDATA[Pakistan Journal of Biological Sciences]]></source>
<year>2008</year>
<volume>11</volume>
<numero>3</numero>
<issue>3</issue>
<page-range>366-72</page-range></nlm-citation>
</ref>
<ref id="B11">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Montenegro]]></surname>
<given-names><![CDATA[H.]]></given-names>
</name>
<name>
<surname><![CDATA[Malagón]]></surname>
<given-names><![CDATA[D.]]></given-names>
</name>
</person-group>
<source><![CDATA[Propiedades Físicas de los Suelos]]></source>
<year>1990</year>
<publisher-loc><![CDATA[Bogotá ]]></publisher-loc>
<publisher-name><![CDATA[Instituto Geográfico Agustín Codazzi]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B12">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Novillo]]></surname>
<given-names><![CDATA[I.]]></given-names>
</name>
<name>
<surname><![CDATA[Carrillo]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Cargua]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Nabel]]></surname>
<given-names><![CDATA[V.]]></given-names>
</name>
<name>
<surname><![CDATA[Albán]]></surname>
<given-names><![CDATA[K.]]></given-names>
</name>
<name>
<surname><![CDATA[Morales]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Propiedades físicas del suelo en diferentes sistemas agrícolas en la provincia de los ríos, Ecuador]]></article-title>
<source><![CDATA[Temas agrarios]]></source>
<year>2018</year>
<volume>23</volume>
<numero>2</numero>
<issue>2</issue>
<page-range>177-87</page-range></nlm-citation>
</ref>
<ref id="B13">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Pebesma]]></surname>
<given-names><![CDATA[E. J.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Multivariable geostatistics in R: the gstat package]]></article-title>
<source><![CDATA[Computers &amp; Geosciences]]></source>
<year>2004</year>
<volume>30</volume>
<page-range>683-91</page-range></nlm-citation>
</ref>
<ref id="B14">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Pebesma]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
<name>
<surname><![CDATA[Bivand]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Classes and methods for spatial data in R]]></article-title>
<source><![CDATA[R News]]></source>
<year>2005</year>
<volume>5</volume>
<numero>2</numero>
<issue>2</issue>
<page-range>9-13</page-range></nlm-citation>
</ref>
<ref id="B15">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Pla]]></surname>
<given-names><![CDATA[L. E.]]></given-names>
</name>
</person-group>
<source><![CDATA[Análisis Multivariado: Método de Componentes Principales]]></source>
<year>1986</year>
<publisher-loc><![CDATA[Washington ]]></publisher-loc>
<publisher-name><![CDATA[OEA]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B16">
<nlm-citation citation-type="book">
<collab>R Core Team</collab>
<source><![CDATA[R: A Language and Environment for Statistical Computing]]></source>
<year>2016</year>
<publisher-loc><![CDATA[Vienna ]]></publisher-loc>
<publisher-name><![CDATA[R Foundation for Statistical Computing]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B17">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Ribeiro]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Diggle]]></surname>
<given-names><![CDATA[P]]></given-names>
</name>
</person-group>
<source><![CDATA[geoR: Analysis of geostatistical data. R package]]></source>
<year>2016</year>
</nlm-citation>
</ref>
<ref id="B18">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Rivera]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Lal]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Amézquita]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
<name>
<surname><![CDATA[Mesa]]></surname>
<given-names><![CDATA[O.]]></given-names>
</name>
<name>
<surname><![CDATA[Chaves]]></surname>
<given-names><![CDATA[B.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Predicción de la erodabilidad en algunos suelos de ladera de la zona cafetera colombiana]]></article-title>
<source><![CDATA[Centro Nacional de Investigaciones de Café]]></source>
<year>2010</year>
<volume>61</volume>
<numero>4</numero>
<issue>4</issue>
<page-range>344-57</page-range></nlm-citation>
</ref>
<ref id="B19">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Rodríguez]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
<name>
<surname><![CDATA[García]]></surname>
<given-names><![CDATA[H.]]></given-names>
</name>
<name>
<surname><![CDATA[Roa Díaz]]></surname>
<given-names><![CDATA[Z.]]></given-names>
</name>
<name>
<surname><![CDATA[Santacoloma]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
</person-group>
<source><![CDATA[Producción de Panela como Estrategia de Diversificación en la Generación de Ingresos en Áreas Rurales de América Latina.]]></source>
<year>2004</year>
<publisher-loc><![CDATA[Roma ]]></publisher-loc>
<publisher-name><![CDATA[Food and Agriculture Organization of the United Nations]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B20">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Salamanca]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Sadeghian]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[La densidad aparente y su relación con otras propiedades en suelos de la zona cafetera colombiana]]></article-title>
<source><![CDATA[Centro Nacional de Investigaciones de Café]]></source>
<year>2006</year>
<volume>56</volume>
<numero>4</numero>
<issue>4</issue>
<page-range>381-97</page-range></nlm-citation>
</ref>
<ref id="B21">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Srivastava]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
</person-group>
<source><![CDATA[Methods of Multivariate Statistics]]></source>
<year>2002</year>
<publisher-loc><![CDATA[Ney Jersey ]]></publisher-loc>
<publisher-name><![CDATA[John Wiley &amp; Sons]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B22">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Vargas]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Serrato]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
<name>
<surname><![CDATA[Trujillo]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Variabilidad espacial de las propiedades físicas de un suelo uventic ustropepts en la cuenca baja del río las Ceibas-Huila]]></article-title>
<source><![CDATA[Ingeniería y Región]]></source>
<year>2015</year>
<volume>1</volume>
<numero>13</numero>
<issue>13</issue>
<page-range>113-23</page-range></nlm-citation>
</ref>
<ref id="B23">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Vargas]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
</person-group>
<source><![CDATA[Zonificación de la Hoya del Río Suárez por propiedades físicas del suelo, para el cultivo de caña panelera]]></source>
<year>2019</year>
<publisher-loc><![CDATA[Bogotá ]]></publisher-loc>
<publisher-name><![CDATA[Facultad de Ciencias, Universidad Nacional de Colombia]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B24">
<nlm-citation citation-type="confpro">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Varón]]></surname>
<given-names><![CDATA[V.]]></given-names>
</name>
<name>
<surname><![CDATA[Camacho]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Ordoñez]]></surname>
<given-names><![CDATA[N.]]></given-names>
</name>
</person-group>
<source><![CDATA[Estudio de la humedad aprovechable del suelo y su relación con algunos atributos físicos en un inceptisol]]></source>
<year>2014</year>
<conf-name><![CDATA[ XICongreso Latinoamericano y del Caribe de Ingeniería Agrícola]]></conf-name>
<conf-loc> </conf-loc>
</nlm-citation>
</ref>
<ref id="B25">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Vergara]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Rodríguez]]></surname>
<given-names><![CDATA[L.]]></given-names>
</name>
<name>
<surname><![CDATA[Alarcón]]></surname>
<given-names><![CDATA[Y.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Estudio de caracterización de la actividad productiva del sector de la caña panelera en la hoya del río Suárez]]></article-title>
<source><![CDATA[NOVUM]]></source>
<year>2018</year>
<numero>8-1</numero>
<issue>8-1</issue>
<page-range>32-48</page-range></nlm-citation>
</ref>
<ref id="B26">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Warrick]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
</person-group>
<source><![CDATA[Soil Physics Companion]]></source>
<year>2002</year>
<publisher-loc><![CDATA[Boca Raton, Florida ]]></publisher-loc>
<publisher-name><![CDATA[CRC press LLC.]]></publisher-name>
</nlm-citation>
</ref>
</ref-list>
</back>
</article>
