<?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>2215-3896</journal-id>
<journal-title><![CDATA[Revista de Ciencias Ambientales]]></journal-title>
<abbrev-journal-title><![CDATA[Ciencias Ambientales]]></abbrev-journal-title>
<issn>2215-3896</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2215-38962020000100123</article-id>
<article-id pub-id-type="doi">10.15359/rca.54-1.7</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Conservación de suelos mediante la modificación de la frecuencia de labranza: un caso en Costa Rica]]></article-title>
<article-title xml:lang="en"><![CDATA[Soil Conservation by Changing the Frequency of Tillage: A Case in Costa Rica]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gómez-Calderón]]></surname>
<given-names><![CDATA[Natalia]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Estrada-León]]></surname>
<given-names><![CDATA[Raciel Javier]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto Tecnológico de Costa Rica Escuela de Ingeniería Agrícola ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Costa Rica</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Instituto Tecnológico Superior de Calkiní  ]]></institution>
<addr-line><![CDATA[ Campeche]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2020</year>
</pub-date>
<volume>54</volume>
<numero>1</numero>
<fpage>123</fpage>
<lpage>139</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S2215-38962020000100123&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S2215-38962020000100123&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S2215-38962020000100123&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  (Introducción):  En Costa Rica, los productores hortícolas labran el suelo cada seis meses, usando sistemas convencionales que pulverizan la capa arable y provocan degradación. (Objetivo): Se evaluó el efecto de diferentes tipos de labranza con el fin de recomendar variaciones en la gestión de la de mecanización de suelos. (Metodología): Se establecieron tratamientos de labranza cero (T1), convencional (T2) y reducida (T3) en un suelo franco-arenoso (Fa). Se determinó el contenido de materia orgánica (MO), densidad aparente (Da), conductividad hidráulica (k), resistencia a la penetración (RP) y retención de humedad (RH), antes de cada tratamiento (T0) y después de seis meses. También, se midieron variables de operación del tractor usado. (Resultados): Se determinó la necesidad de lastrar el tractor para rotar el suelo y tener mejor eficiencia, debido al derrape del eje delantero en T2 (-34.81 %). T2 mostró aumentos de MO (p&lt;0.05), por efecto a corto plazo del corte superficial de la cobertura vegetal y Da aumentó (p&lt;0.05) a los 30-45 cm en T1, debido a que no hubo pase de arado de cincel. Ningún tratamiento cambió la condición de k moderada hasta los 30 cm de profundidad. T3, mejoró RP (p&lt;0.05) hasta esa misma profundidad debido al pase de arado de cincel. La RH no experimentó cambios (p&lt;0.05). (Conclusiones): Por la ineficiencia de operación y a que no hay mejora física del suelo en el corto plazo, no es necesario labrar cada seis meses, lo que reduciría las tasas de erosión de la zona.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  (Introduction:) In Costa Rica, horticultural producers till the soil every six months, using conventional systems that pulverize the arable layer and cause degradation. (Objectives:) The effect of different types of tillage was evaluated in order to recommend variations in the management of soil mechanization. (Methodology:) Tillage treatments were established for which zero (T1), conventional (T2) and reduced (T3) in a loamy-sandy soil (Fa). The organic matter content (MO), apparent density (Da), hydraulic conductivity (k), penetration resistance (RP) and moisture retention (RH) were determined before each treatment (T0) and after six months. Also, operation variables of the used tractor were measured. (Results:) The need to ballast the tractor to rotate the ground and have better efficiency was determined due to the skid of the front axle at T2 (-34.81%). T2 showed increases in MO (p &lt;0.05), due to the short-term effect of the surface cut of the vegetation cover and Da increased (p &lt;0.05) at 30-45 cm in T1, because there was no chisel plow pass. No treatment changed the condition of moderate k to 30 cm deep. T3, improved RP (p &lt;0.05) up to that same depth due to the chisel plow pass. HR did not change (p &lt;0.05). (Conclusions:) Due to the inefficiency of operation and because there is no physical improvement of the soil in the short term, it is not necessary to till every six months, which would reduce the erosion rates of the area.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[degradación de suelos]]></kwd>
<kwd lng="es"><![CDATA[labranza de conservación]]></kwd>
<kwd lng="es"><![CDATA[maquinaria agrícola]]></kwd>
<kwd lng="es"><![CDATA[propiedades físicas.]]></kwd>
<kwd lng="en"><![CDATA[agricultural machinery]]></kwd>
<kwd lng="en"><![CDATA[conservation tillage]]></kwd>
<kwd lng="en"><![CDATA[physical properties]]></kwd>
<kwd lng="en"><![CDATA[soil degradation.]]></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[Alvarado]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Delome]]></surname>
<given-names><![CDATA[S]]></given-names>
</name>
</person-group>
<source><![CDATA[Maquinaria y mecanización agrícola]]></source>
<year>2004</year>
<publisher-loc><![CDATA[San José, Costa Rica ]]></publisher-loc>
<publisher-name><![CDATA[EUNED]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B2">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Álvarez]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Mart]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
<name>
<surname><![CDATA[Aires]]></surname>
<given-names><![CDATA[B.]]></given-names>
</name>
</person-group>
<source><![CDATA[¿Afecta el sistema de labranza las propiedades físicas de los suelos de la Región Pampeana?]]></source>
<year>2006</year>
</nlm-citation>
</ref>
<ref id="B3">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Amezquita]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
</person-group>
<source><![CDATA[Diseño y construcción de un microrelievímetro para evaluar la dinámica de la erosión en zonas de ladera]]></source>
<year>1996</year>
<publisher-loc><![CDATA[Cali, Colombia ]]></publisher-loc>
</nlm-citation>
</ref>
<ref id="B4">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Arrazate-Oropeza]]></surname>
<given-names><![CDATA[B.]]></given-names>
</name>
<name>
<surname><![CDATA[Gómez-Calderón]]></surname>
<given-names><![CDATA[N.]]></given-names>
</name>
<name>
<surname><![CDATA[Villagra-Mendoza]]></surname>
<given-names><![CDATA[K.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Comparación de patinaje bajo diferentes tipos de labranza de suelo]]></article-title>
<source><![CDATA[XII Congreso Latinoamericano y del Caribe de Ingeniería Agrícola]]></source>
<year>2016</year>
<page-range>649</page-range><publisher-loc><![CDATA[Bogotá, Colombia ]]></publisher-loc>
<publisher-name><![CDATA[Universidad Nacional de Colombia]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B5">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Báez]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Aguirre]]></surname>
<given-names><![CDATA[J. F.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Efecto de la labranza de conservación sobre las propiedades del suelo]]></article-title>
<source><![CDATA[Terra Latinoamericana]]></source>
<year>2011</year>
<volume>29</volume>
<numero>2</numero>
<issue>2</issue>
<page-range>113-21</page-range></nlm-citation>
</ref>
<ref id="B6">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Bangita]]></surname>
<given-names><![CDATA[B.]]></given-names>
</name>
<name>
<surname><![CDATA[Rao]]></surname>
<given-names><![CDATA[B. K. R.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Impacts of compaction relief treatments on soil physical properties and performance of sugarcane (Saccharum spp.) under zonal tillage system]]></article-title>
<source><![CDATA[Geoderma]]></source>
<year>2012</year>
<volume>189-190</volume>
<page-range>351-6</page-range></nlm-citation>
</ref>
<ref id="B7">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Ben]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
<name>
<surname><![CDATA[Gallali]]></surname>
<given-names><![CDATA[T.]]></given-names>
</name>
<name>
<surname><![CDATA[Ben]]></surname>
<given-names><![CDATA[N.]]></given-names>
</name>
<name>
<surname><![CDATA[Jemai]]></surname>
<given-names><![CDATA[I.]]></given-names>
</name>
<name>
<surname><![CDATA[Ben-Hammouda]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Impact of three and seven years of no-tillage on the soil water storage, in the plant root zone, under a dry subhumid Tunisian climate]]></article-title>
<source><![CDATA[Soil and Tillage Research]]></source>
<year>2012</year>
<volume>126</volume>
<page-range>26-33</page-range></nlm-citation>
</ref>
<ref id="B8">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Castilla]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Siembra directa. La elegida para conservar el suelo: una decisión agronómica que combina rotación de cultivos, fertilizantes y agricultura de precisión para aumentar la producción y preservar los recursos naturales]]></article-title>
<source><![CDATA[Revista de Investigaciones Agropecuarias]]></source>
<year>2013</year>
<volume>39</volume>
<numero>2</numero>
<issue>2</issue>
<page-range>118-23</page-range></nlm-citation>
</ref>
<ref id="B9">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Ceballos]]></surname>
<given-names><![CDATA[D.]]></given-names>
</name>
<name>
<surname><![CDATA[Hernández]]></surname>
<given-names><![CDATA[O.]]></given-names>
</name>
<name>
<surname><![CDATA[Vélez]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Efecto de la labranza sobre las propiedades físicas en un andisol del Departamento de Nariño]]></article-title>
<source><![CDATA[Revista de Agronomía]]></source>
<year>2010</year>
<volume>XXVII</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>40-8</page-range></nlm-citation>
</ref>
<ref id="B10">
<nlm-citation citation-type="">
<collab>COMCURE</collab>
<source><![CDATA[Generalidades de la Cuenca del Río Reventazón - Parismina]]></source>
<year>2016</year>
</nlm-citation>
</ref>
<ref id="B11">
<nlm-citation citation-type="journal">
<collab>FAO</collab>
<article-title xml:lang=""><![CDATA[Guía para la descripción de suelos]]></article-title>
<source><![CDATA[Organización de las Naciones Unidas para la Agricultura y la Alimentación]]></source>
<year>2009</year>
<volume>100</volume>
</nlm-citation>
</ref>
<ref id="B12">
<nlm-citation citation-type="">
<collab>FAO y ITPS</collab>
<source><![CDATA[Status of the World&#8217;s Soil Resources (SWSR) - Main Report]]></source>
<year>2015</year>
<publisher-loc><![CDATA[Rome, Italy ]]></publisher-loc>
</nlm-citation>
</ref>
<ref id="B13">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Gómez-Calderón]]></surname>
<given-names><![CDATA[N.]]></given-names>
</name>
</person-group>
<source><![CDATA[Fundamentos de maquinaria agrícola]]></source>
<year>2016</year>
<publisher-loc><![CDATA[San José, Costa Rica ]]></publisher-loc>
<publisher-name><![CDATA[EUNED]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B14">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Gómez-Calderón]]></surname>
<given-names><![CDATA[N.]]></given-names>
</name>
<name>
<surname><![CDATA[Solórzano-Quintana]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Villagra-Mendoza]]></surname>
<given-names><![CDATA[K.]]></given-names>
</name>
</person-group>
<source><![CDATA[Cuantificación de la erosión hídrica en función de diferentes técnicas de mecanización para minimizar la contaminación del agua por sedimentos en la parte alta de la Cuenca del Río Reventazón. RepositorioTEC]]></source>
<year>2017</year>
</nlm-citation>
</ref>
<ref id="B15">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Gómez-Calderón]]></surname>
<given-names><![CDATA[N.]]></given-names>
</name>
<name>
<surname><![CDATA[Solorzano-Quintana]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Villagra-Mendoza]]></surname>
<given-names><![CDATA[K.]]></given-names>
</name>
</person-group>
<source><![CDATA[Cuantificación de la erosión hídrica en función de diferentes técnicas de mecanización para minimizar la contaminación del agua por sedimentos en la parte alta de la Cuenca del Río Reventazón. Informe final]]></source>
<year>2016</year>
<publisher-loc><![CDATA[Cartago, Costa Rica ]]></publisher-loc>
</nlm-citation>
</ref>
<ref id="B16">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Gómez-Calderón]]></surname>
<given-names><![CDATA[N.]]></given-names>
</name>
<name>
<surname><![CDATA[Villagra-Mendoza]]></surname>
<given-names><![CDATA[K.]]></given-names>
</name>
<name>
<surname><![CDATA[Rímolo-Donadio]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
</person-group>
<source><![CDATA[Estudio de factibilidad de desarrollo de un sistema de monitoreo aéreo de baja altura para la agricultura en el control de la erosión]]></source>
<year>2015</year>
</nlm-citation>
</ref>
<ref id="B17">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Gómez-Calderón]]></surname>
<given-names><![CDATA[N.]]></given-names>
</name>
<name>
<surname><![CDATA[Villagra-Mendoza]]></surname>
<given-names><![CDATA[K.]]></given-names>
</name>
<name>
<surname><![CDATA[Solórzano-Quintana]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[La labranza mecanizada y su impacto en la conservación del suelo (revisión literaria)]]></article-title>
<source><![CDATA[Revista Tecnología en Marcha]]></source>
<year>2018</year>
<volume>31</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>167-77</page-range></nlm-citation>
</ref>
<ref id="B18">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Gutiérrez-Rodríguez]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
<name>
<surname><![CDATA[González-Huerta]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Pérez-López]]></surname>
<given-names><![CDATA[D. D. J.]]></given-names>
</name>
<name>
<surname><![CDATA[Franco-Mora]]></surname>
<given-names><![CDATA[O.]]></given-names>
</name>
<name>
<surname><![CDATA[Morales-Rosales]]></surname>
<given-names><![CDATA[E. J.]]></given-names>
</name>
<name>
<surname><![CDATA[Saldívar-Iglesias]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
<name>
<surname><![CDATA[Martínez-Rueda]]></surname>
<given-names><![CDATA[C. G.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Compactación inducida por el rodaje de tractores agrícolas en un vertisol. Compaction Induced by Breaking of Agricultural Tractors in Vertisol]]></article-title>
<source><![CDATA[Terra Latinoamericana]]></source>
<year>2012</year>
<volume>30</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>1-7</page-range></nlm-citation>
</ref>
<ref id="B19">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Hillel]]></surname>
<given-names><![CDATA[D.]]></given-names>
</name>
</person-group>
<source><![CDATA[Environmental Soil Physics]]></source>
<year>1998</year>
<publisher-loc><![CDATA[USA ]]></publisher-loc>
<publisher-name><![CDATA[Academic Press]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B20">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Horne]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Hartge]]></surname>
<given-names><![CDATA[K. H.]]></given-names>
</name>
<name>
<surname><![CDATA[Horton]]></surname>
<given-names><![CDATA[R]]></given-names>
</name>
<name>
<surname><![CDATA[Horn]]></surname>
<given-names><![CDATA[R]]></given-names>
</name>
<name>
<surname><![CDATA[Bachmann]]></surname>
<given-names><![CDATA[J]]></given-names>
</name>
<name>
<surname><![CDATA[Peth]]></surname>
<given-names><![CDATA[S]]></given-names>
</name>
</person-group>
<source><![CDATA[Essential Soil Physics]]></source>
<year>2016</year>
<publisher-loc><![CDATA[Sttutgart, Germany ]]></publisher-loc>
<publisher-name><![CDATA[Schweizerbart Science Publishers]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B21">
<nlm-citation citation-type="">
<collab>IPCC</collab>
<source><![CDATA[Climate Change and Land]]></source>
<year>2019</year>
</nlm-citation>
</ref>
<ref id="B22">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Kovalevski]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
<name>
<surname><![CDATA[García]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
<name>
<surname><![CDATA[Ferreras]]></surname>
<given-names><![CDATA[L.]]></given-names>
</name>
<name>
<surname><![CDATA[Magra]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
<name>
<surname><![CDATA[Besson]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Indicadores de calidad física en suelo de la Región Pampeana Norte De Argentina Bajo Siembra Directa]]></article-title>
<source><![CDATA[CI Suelo]]></source>
<year>2007</year>
<volume>25</volume>
<numero>2</numero>
<issue>2</issue>
<page-range>159-72</page-range></nlm-citation>
</ref>
<ref id="B23">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Kroulík]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Kvíz]]></surname>
<given-names><![CDATA[Z.]]></given-names>
</name>
<name>
<surname><![CDATA[Kumhála]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
<name>
<surname><![CDATA[H&#367;la]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Loch]]></surname>
<given-names><![CDATA[T.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Procedures of soil farming allowing reduction of compaction]]></article-title>
<source><![CDATA[Precision Agriculture]]></source>
<year>2011</year>
</nlm-citation>
</ref>
<ref id="B24">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Lal]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Soil Degradation by Erosion]]></article-title>
<source><![CDATA[Land Degradation and Development]]></source>
<year>2001</year>
<volume>12</volume>
<page-range>519-39</page-range></nlm-citation>
</ref>
<ref id="B25">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Lal]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Shukla]]></surname>
<given-names><![CDATA[M. K.]]></given-names>
</name>
<name>
<surname><![CDATA[Marcel Dekker]]></surname>
<given-names><![CDATA[I]]></given-names>
</name>
</person-group>
<source><![CDATA[Principles of Soil Physics]]></source>
<year>2005</year>
<publisher-loc><![CDATA[New York, USA ]]></publisher-loc>
<publisher-name><![CDATA[Taylor &amp; Francis e-Library]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B26">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Mehuys]]></surname>
<given-names><![CDATA[G. R.]]></given-names>
</name>
<name>
<surname><![CDATA[Tiessen]]></surname>
<given-names><![CDATA[K. H. D.]]></given-names>
</name>
<name>
<surname><![CDATA[Villatoro]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Sancho]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
<name>
<surname><![CDATA[Lobb]]></surname>
<given-names><![CDATA[D. A.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Erosión por labranza con arado de disco en suelos volcánicos de ladera en Costa Rica]]></article-title>
<source><![CDATA[Agronomía Costarricense]]></source>
<year>2009</year>
<volume>33</volume>
<numero>2</numero>
<issue>2</issue>
<page-range>205-15</page-range></nlm-citation>
</ref>
<ref id="B27">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Quintero]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Comerford]]></surname>
<given-names><![CDATA[N. B.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Effects of Conservation Tillage on Total and Aggregated Soil Organic Carbon in the Andes]]></article-title>
<source><![CDATA[Open Journal of Soil Science]]></source>
<year>2013</year>
<volume>03</volume>
<numero>08</numero>
<issue>08</issue>
<page-range>361-73</page-range></nlm-citation>
</ref>
<ref id="B28">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Reichert]]></surname>
<given-names><![CDATA[J. M.]]></given-names>
</name>
<name>
<surname><![CDATA[da Rosa]]></surname>
<given-names><![CDATA[V. T.]]></given-names>
</name>
<name>
<surname><![CDATA[Vogelmann]]></surname>
<given-names><![CDATA[E. S.]]></given-names>
</name>
<name>
<surname><![CDATA[da Rosa]]></surname>
<given-names><![CDATA[D. P.]]></given-names>
</name>
<name>
<surname><![CDATA[Horn]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Reinert]]></surname>
<given-names><![CDATA[D. J.]]></given-names>
</name>
<name>
<surname><![CDATA[Denardin]]></surname>
<given-names><![CDATA[J. E.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Conceptual framework for capacity and intensity physical soil properties affected by short and long-term (14 years) continuous no-tillage and controlled traffic]]></article-title>
<source><![CDATA[Soil and Tillage Research]]></source>
<year>2016</year>
<volume>158</volume>
<page-range>123-36</page-range></nlm-citation>
</ref>
<ref id="B29">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Reynolds]]></surname>
<given-names><![CDATA[W. D.]]></given-names>
</name>
<name>
<surname><![CDATA[Drury]]></surname>
<given-names><![CDATA[C. F.]]></given-names>
</name>
<name>
<surname><![CDATA[Yang]]></surname>
<given-names><![CDATA[X. M.]]></given-names>
</name>
<name>
<surname><![CDATA[Tan]]></surname>
<given-names><![CDATA[C. S.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Optimal soil physical quality inferred through structural regression and parameter interactions]]></article-title>
<source><![CDATA[Geoderma]]></source>
<year>2008</year>
<volume>146</volume>
<numero>3-4</numero>
<issue>3-4</issue>
<page-range>466-74</page-range></nlm-citation>
</ref>
<ref id="B30">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Rivas]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
<name>
<surname><![CDATA[Velásquez]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
<name>
<surname><![CDATA[Tenías]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Efecto de sistemas de preparación de suelos sobre algunas propiedades físicas del suelo y biométricas en yuca (Manihot esculenta Crantz) en Llanos Altos de Monagas]]></article-title>
<source><![CDATA[Revista Científica UDO Agrícola]]></source>
<year>2004</year>
<volume>4</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>36-41</page-range></nlm-citation>
</ref>
<ref id="B31">
<nlm-citation citation-type="book">
<collab>RStudio</collab>
<source><![CDATA[R Studio]]></source>
<year>2018</year>
<publisher-loc><![CDATA[Boston, MA ]]></publisher-loc>
<publisher-name><![CDATA[The R Foundation for Statistical Computing]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B32">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Salem]]></surname>
<given-names><![CDATA[H. M.]]></given-names>
</name>
<name>
<surname><![CDATA[Valero]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<name>
<surname><![CDATA[Muñoz]]></surname>
<given-names><![CDATA[M. Á.]]></given-names>
</name>
<name>
<surname><![CDATA[Rodríguez]]></surname>
<given-names><![CDATA[M. G.]]></given-names>
</name>
<name>
<surname><![CDATA[Silva]]></surname>
<given-names><![CDATA[L. L.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Short-term effects of four tillage practices on soil physical properties, soil water potential, and maize yield]]></article-title>
<source><![CDATA[Geoderma]]></source>
<year>2015</year>
<volume>237-238</volume>
<page-range>60-70</page-range></nlm-citation>
</ref>
<ref id="B33">
<nlm-citation citation-type="">
<collab>USDA</collab>
<source><![CDATA[Soil Survey Field and Laboratory Methods Manual. Soil Survey Investigations Report N.° 51. Version 2.0.]]></source>
<year>2014</year>
</nlm-citation>
</ref>
<ref id="B34">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Vignola]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[McDaniels]]></surname>
<given-names><![CDATA[T. L.]]></given-names>
</name>
<name>
<surname><![CDATA[Scholz]]></surname>
<given-names><![CDATA[R. W.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Governance structures for ecosystem-based adaptation: Using policy-network analysis to identify key organizations for bridging information across scales and policy areas]]></article-title>
<source><![CDATA[Environmental Science &amp; Policy]]></source>
<year>2013</year>
<volume>31</volume>
<page-range>71-84</page-range></nlm-citation>
</ref>
<ref id="B35">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Villalobos-Araya]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Guzmán-Arias]]></surname>
<given-names><![CDATA[I.]]></given-names>
</name>
<name>
<surname><![CDATA[Zúñiga-Pereira]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Evaluación de tres tipos de labranza en el cultivo de la papa (Solannum tuberosum)]]></article-title>
<source><![CDATA[Tecnología En Marcha]]></source>
<year>2009</year>
<volume>22</volume>
<page-range>40-50</page-range></nlm-citation>
</ref>
<ref id="B36">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Xue]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Zhao]]></surname>
<given-names><![CDATA[X.]]></given-names>
</name>
<name>
<surname><![CDATA[Dikgwatlhe]]></surname>
<given-names><![CDATA[S. B.]]></given-names>
</name>
<name>
<surname><![CDATA[Chen]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
<name>
<surname><![CDATA[Zhang]]></surname>
<given-names><![CDATA[H.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Advances in effects of conservation tillage on soil organic carbon and nitrogen]]></article-title>
<source><![CDATA[Shengtai Xuebao/ Acta Ecológica Sinica]]></source>
<year>2013</year>
<volume>33</volume>
<numero>19</numero>
<issue>19</issue>
<page-range>6006-13</page-range></nlm-citation>
</ref>
</ref-list>
</back>
</article>
