<?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>0187-5779</journal-id>
<journal-title><![CDATA[Terra Latinoamericana]]></journal-title>
<abbrev-journal-title><![CDATA[Terra Latinoam]]></abbrev-journal-title>
<issn>0187-5779</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Mexicana de la Ciencia del Suelo A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0187-57792011000300259</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Índices espectrales en pimiento para el diagnóstico nutrimental de nitrógeno]]></article-title>
<article-title xml:lang="en"><![CDATA[Spectral Indexes in Sweet Pepper for Diagnosis of Nitrogen Nutrient Status]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cruz-Durán]]></surname>
<given-names><![CDATA[Jairo Aarón de la]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sánchez-García]]></surname>
<given-names><![CDATA[Prometeo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Galvis-Spínola]]></surname>
<given-names><![CDATA[Arturo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Carrillo-Salazar]]></surname>
<given-names><![CDATA[José Alfredo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Colegio de Postgraduados Postgrado de Edafología ]]></institution>
<addr-line><![CDATA[ estado de México]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Colegio de Postgraduados Postgrado de Genética ]]></institution>
<addr-line><![CDATA[ estado de México]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>09</month>
<year>2011</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>09</month>
<year>2011</year>
</pub-date>
<volume>29</volume>
<numero>3</numero>
<fpage>259</fpage>
<lpage>265</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0187-57792011000300259&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0187-57792011000300259&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0187-57792011000300259&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen El espectro de la reflectancia de luz por el follaje de las plantas es un indicador preciso de la fracción de la cobertura vegetal, que está altamente asociada con la captura de la radiación y el estado nutrimental de los cultivos. El objetivo de esta investigación fue relacionar las firmas espectrales en pimiento con el contenido de nitrógeno total en hojas. Se estableció un experimento en condiciones hidropónicas con el cultivo de pimiento y se generó un gradiente de concentración de nitrógeno nítrico en la solución nutritiva: 0, 4, 8, 12, 16 y 20 meq L-1. Durante el crecimiento del pimiento se monitoreó la reflectancia de la planta en tres bandas del espectro visible y dos del infrarrojo cercano, se tomaron imágenes digitales para la determinación del índice de área foliar (IAF) y se colectaron muestras vegetales para el análisis de concentración de nitrógeno. La aplicación de los índices de vegetación, como el modelo verde (830 nm / 560 nm) -1 y tasa normalizada (NDVI 560) / (NDVI 660), en la interpretación de las firmas espectrales obtenidas con un espectroradiómetro, permitió establecer niveles críticos de reflectancia. Los índices de vegetación mostraron una alta correlación (r2 &gt;0.8) con deficiencia de nitrógeno total en hojas menores de 3%.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract The spectrum of the light reflectance for the plant&#8217;s foliage is a precise indicator of the fraction of the vegetable coverage, which is highly associated with the radiation interception and crop nutrimental condition. The objective of this research consisted in relating the spectral signatures in pepper to the nitrogen concentration in leaves. A pepper crop experiment was established in hydroponics conditions and a gradient of concentration of nitrate was generated in the nutrient solution: 0, 4, 8, 12, 16, and 20 meq L-1. During the pepper growth cycle, the reflectance in the pepper was monitored in three bands of the visible spectrum and in two of the near infrared, digital images were taken to determinate the foliar area index (FAI) and vegetable samples were collected for the analysis of nitrogen concentration. The utilization of the indexes of vegetation, as the green model (830 nm / 560 nm) - 1 and normalized rate (NDVI 560) / (NDVI 660), in the interpretation of the spectral signatures obtained by the spectrometer, allowed to establish critical levels of reflectance. The indexes of vegetation showed a high correlation (r2 &gt; 0.8) with nitrogen deficiency minor of 3%.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[sensores remotos]]></kwd>
<kwd lng="es"><![CDATA[NDVI]]></kwd>
<kwd lng="es"><![CDATA[índices espectrales]]></kwd>
<kwd lng="en"><![CDATA[remote sensors]]></kwd>
<kwd lng="en"><![CDATA[NDVI]]></kwd>
<kwd lng="en"><![CDATA[spectral index]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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