<?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>0012-7353</journal-id>
<journal-title><![CDATA[DYNA]]></journal-title>
<abbrev-journal-title><![CDATA[Dyna rev.fac.nac.minas]]></abbrev-journal-title>
<issn>0012-7353</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional de Colombia]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0012-73532017000100316</article-id>
<article-id pub-id-type="doi">10.15446/dyna.v84n200.52740</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Methodology to determine the soil sampling grid for precision agriculture in a coffee field]]></article-title>
<article-title xml:lang="es"><![CDATA[Metodología para determinar la cuadrícula de muestreo del suelo para la agricultura de precisión en un campo de café]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Araújo e Silva Ferraz]]></surname>
<given-names><![CDATA[Gabriel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Silva de Oliveira]]></surname>
<given-names><![CDATA[Marcelo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Moreira da Silva]]></surname>
<given-names><![CDATA[Fábio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Carvalho Avelar]]></surname>
<given-names><![CDATA[Rogner]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Castro da Silva]]></surname>
<given-names><![CDATA[Flávio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ferreira Ponciano Ferraz]]></surname>
<given-names><![CDATA[Patrícia]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidade Federal de Lavras Engineering Department ]]></institution>
<addr-line><![CDATA[Lavras ]]></addr-line>
<country>Brazil</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidade Federal de Lavras Exact Science Department ]]></institution>
<addr-line><![CDATA[Lavras ]]></addr-line>
<country>Brazil</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Cooperativa dos Cafeicultores do Cerrado Monte Carmelo LTDA  ]]></institution>
<addr-line><![CDATA[Monte Carmelo ]]></addr-line>
<country>Brazil</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Universidade Federal Fluminense Agricultural and Environmental Department ]]></institution>
<addr-line><![CDATA[Passo da Pátria ]]></addr-line>
<country>Brazil</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>03</month>
<year>2017</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>03</month>
<year>2017</year>
</pub-date>
<volume>84</volume>
<numero>200</numero>
<fpage>316</fpage>
<lpage>325</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0012-73532017000100316&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0012-73532017000100316&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0012-73532017000100316&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract The objective of this study was to develop and propose a methodology to evaluate the quality of different sampling grids. In addition, it allows us to choose the sampling grid that better suits one or a set of variables. The structure and magnitude of the spatial dependence were characterized by semivariogram. It allowed us to apply validation techniques as a base to create an index for evaluating the grid quality, and to develop an indicator that points out the best sampling grid. To test the proposed methodology, an experiment was performed at the Brejão farm, in Brazil. We have developed and compared twenty sampling grids, which were applied to four soil variables sampled in georeferenced locations. An accuracy index (AI), a precision index (PI) and the optimum grid indicator (OGI) were developed and proposed, which allowed us to choose the best grid (grid 5) among the sampling grids.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen El objetivo de este estudio fue desarrollar y proponer una metodología para evaluar la calidad de las diferentes cuadrículas de muestreo. Además, es posible elegir la cuadricula de muestreo que mejor se adapte a una o un conjunto de variables. La estructura y la magnitud de la dependencia espacial fueron caracterizadas por semivariograma. Esto nos permitió utilizar las técnicas de validación que funcionaron como base para crear una clasificación para evaluar la calidad de la cuadricula y para desarrollar un indicador que apunta la mejor cuadricula de muestreo. Un experimento fue realizado en la hacienda Brejão en Brasil, para probar la metodología propuesta. Hemos desarrollado y comparado veinte muestras que fueran aplicadas en cuatro variables de suelo muestreados en los puntos georeferenciados. Un índice de exactitude (AI), un índice de precisión (PI) y el indicador de cuadricula óptima (OGI), fueron desarrollados y propuestos lo que nos permitió elegir la mejor muestra cuadricula de muestreo (cuadricula 5) entre las cuadrículas de muestreo.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Geostatistics]]></kwd>
<kwd lng="en"><![CDATA[spatial variability]]></kwd>
<kwd lng="en"><![CDATA[soil fertility]]></kwd>
<kwd lng="en"><![CDATA[accuracy index]]></kwd>
<kwd lng="en"><![CDATA[precision index]]></kwd>
<kwd lng="en"><![CDATA[optimum grid indicator]]></kwd>
<kwd lng="es"><![CDATA[geoestadística]]></kwd>
<kwd lng="es"><![CDATA[variabilidad espacial]]></kwd>
<kwd lng="es"><![CDATA[fertilidad del suelo]]></kwd>
<kwd lng="es"><![CDATA[índice de exactitude]]></kwd>
<kwd lng="es"><![CDATA[índice de precisión]]></kwd>
<kwd lng="es"><![CDATA[indicador de cuadricula óptima]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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