<?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>0377-9424</journal-id>
<journal-title><![CDATA[Agronomía Costarricense]]></journal-title>
<abbrev-journal-title><![CDATA[Agron. Costarricense]]></abbrev-journal-title>
<issn>0377-9424</issn>
<publisher>
<publisher-name><![CDATA[Universidad de Costa Rica. Colegio de Ingenieros y Agrónomos. Ministerio de Agricultura y Ganadería]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0377-94242020000200139</article-id>
<article-id pub-id-type="doi">10.15517/rac.v44i2.43108</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Desarrollo de métodos de análisis de espectroscopia y algoritmos de aprendizaje automático para la evaluación de algunas propiedades del suelo en Costa Rica]]></article-title>
<article-title xml:lang="en"><![CDATA[Development of spectroscopic methods and machine learning algorithms for evaluation of some soil properties in Costa Rica]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Perret]]></surname>
<given-names><![CDATA[Johan]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Villalobos-Leandro]]></surname>
<given-names><![CDATA[José Eduardo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Abdalla-Bolaños]]></surname>
<given-names><![CDATA[Karim]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Fuentes-Fallas]]></surname>
<given-names><![CDATA[Carol Lucía]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cuarezma-Espinoza]]></surname>
<given-names><![CDATA[Katherine Michelle]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Macas-Amaya]]></surname>
<given-names><![CDATA[Esteban Nicolás]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[López-Maietta]]></surname>
<given-names><![CDATA[María Teresa]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Drewry]]></surname>
<given-names><![CDATA[Darren]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad EARTH, Centro de Agricultura de Precisión  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Costa Rica.</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad EARTH, Centro de Agricultura de Precisión  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Costa Rica.</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad EARTH, Centro de Agricultura de Precisión,  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Costa Rica.</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Universidad EARTH, Centro de Agricultura de Precisión,  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Costa Rica</country>
</aff>
<aff id="Af5">
<institution><![CDATA[,Universidad EARTH, Centro de Agricultura de Precisión,  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Costa Rica.</country>
</aff>
<aff id="Af6">
<institution><![CDATA[,Universidad EARTH, Centro de Agricultura de Precisión,  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Costa Rica</country>
</aff>
<aff id="Af7">
<institution><![CDATA[,Universidad EARTH, Laboratorio de Suelos y Aguas  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Costa Rica</country>
</aff>
<aff id="Af8">
<institution><![CDATA[,Ohio State University, Department of Food, Agricultural and Biological Engineering  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>USA</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2020</year>
</pub-date>
<volume>44</volume>
<numero>2</numero>
<fpage>139</fpage>
<lpage>154</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S0377-94242020000200139&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S0377-94242020000200139&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S0377-94242020000200139&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN  Introducción.  Los métodos convencionales de laboratorio para analizar el contenido de nutrientes del suelo, generalmente requieren mucho tiempo y son costosos. En contraparte, la espectroradioscopia visible e infrarroja ofrece una técnica rápida para caracterizar el suelo en laboratorio. Las firmas espectrales codifican información sobre las características inherentes del suelo, como la composición mineral, el contenido de nutrientes, los compuestos orgánicos y el agua.  Objetivo.  El objetivo principal de este proyecto fue construir bibliotecas espectrales para los suelos tropicales de Costa Rica y determinar las bandas hiperespectrales óptimas en el rango espectral visible infrarrojo cercano e infrarrojo de onda corta para caracterizar propiedades de suelo.  Materiales y métodos.  Las mediciones hiperespectrales se llevaron a cabo con un espectroradiómetro ASD FieldSpec 4 para generar las firmas de reflectancia espectral de más de 1300 muestras de suelo de Costa Rica, pre-procesadas en el Laboratorio de Suelo de la Universidad EARTH. Se determinó el contenido de nutrientes de cada muestra de suelo, mediante plasma acoplado inductivamente. Además, se evaluaron el pH, la acidez extraíble, la saturación de bases, la saturación de acidez, la capacidad efectiva de intercambio catiónico, el carbono, la materia orgánica y la textura del suelo. Se desarrollaron modelos de regresión de mínimos cuadrados parciales (PLSR) en MATLAB para predecir esas propiedades de suelo a partir de firmas hiperespectrales.  Resultados.  Este enfoque espectroradioscópico, combinado con modelos de aprendizaje automático, permitió identificar bandas de ondas óptimas específicas en zonas espectrales en las que se puede predecir cada nutriente. Se logró una estimación precisa del contenido de diferentes componentes (Ca, Mg, Fe, C, N y CICE) con un R2 superior a 0,8 y un error cuadrático medio (RMSE) inferior a 10%.  Conclusión.  Los análisis espectroscópicos combinados con el método Mínimo Cuadrático Parcial (PLS), pueden proporcionar una herramienta muy útil para la agricultura de precisión en los suelos tropicales de Costa Rica.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT  Introduction.  Conventional laboratory methods to analyze soil nutrients are usually time-consuming and costly. On the other hand, the visible and infrared spectroscopy offers a rapid technique to characterize soils. The spectral signatures encode information about the inherent composition of the soil, which comprises mineral composition, nutrient content, organic compounds and water.  Objective. The main objective of this study was to build spectral libraries for the tropical soils of Costa Rica and to determine the optimal hyperspectral wave bands in the visible and near infrared and shortwave infrared to characterize soil properties in laboratory.  Materials and methods.  The hyperspectral measurements were carried out with an ASD FieldSpec 4 spectroradiometer to generate spectral reflectance signatures of more than 1300 soil samples from Costa Rica preprocessed at EARTH University&#8217;s soil laboratory. The nutrient content of each soil sample was determined by inductively coupled plasma. In addition, pH, exchangeable acidity, base saturation, acid saturation, effective cation exchange capacity, soil carbon, organic matter and soil texture were evaluated. Algorithms in MATLAB were developed to compile a hyperspectral data base and used a partial least squares regression (PLSR) methods to generate predictive models for these soil properties from hyperspectral signatures.  Results.  This spectroscopic approach combined with machine learning models allowed the identification of specific optimal wavebands in the spectral areas in which each nutrient can be predicted. An accurate estimation of the concentration of different components (Ca, Mg, Fe, C, N and CECe) was achieved with an R2 greater than 0,8 and a mean square error (RMSE) lower than 10%.  Conclusion.  These spectroscopic technics combined with the PLS regression, can provide a very useful tool for precision agriculture in tropical soils of Costa Rica.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Espectroradiometría]]></kwd>
<kwd lng="es"><![CDATA[firmas hiperespectrales]]></kwd>
<kwd lng="es"><![CDATA[aprendizaje automático]]></kwd>
<kwd lng="es"><![CDATA[modelado PLSR]]></kwd>
<kwd lng="es"><![CDATA[agricultura de precisión]]></kwd>
<kwd lng="en"><![CDATA[Spectroradiometry]]></kwd>
<kwd lng="en"><![CDATA[hyperspectral signatures]]></kwd>
<kwd lng="en"><![CDATA[machine Learning]]></kwd>
<kwd lng="en"><![CDATA[PLSR modeling]]></kwd>
<kwd lng="en"><![CDATA[precision agriculture]]></kwd>
</kwd-group>
</article-meta>
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