<?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>S2305-06832019000100011</article-id>
<article-id pub-id-type="doi">10.18004/investig.agrar.2019.junio.11-22</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Capacidad de un sensor óptico terrestre como herramienta para detectar deficiencia de nitrógeno en el cultivo de algodón]]></article-title>
<article-title xml:lang="en"><![CDATA[Capacity of a terrestrial optical sensor as a tool to detect nitrogen deficiency in cotton crop]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Bonnin]]></surname>
<given-names><![CDATA[Juan José]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Franco Ibars]]></surname>
<given-names><![CDATA[Rubén]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vera Ojeda]]></surname>
<given-names><![CDATA[Pedro Aníbal]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Avalos]]></surname>
<given-names><![CDATA[Juan Daniel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional de Asunción Facultad de Ciencias Agrarias Área de Ingeniería Agrícola]]></institution>
<addr-line><![CDATA[San Lorenzo ]]></addr-line>
<country>Paraguay</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional de Asunción Facultad de Ciencias Agrarias Área de Protección Vegetal]]></institution>
<addr-line><![CDATA[San Lorenzo ]]></addr-line>
<country>Paraguay</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Nacional de Asunción Facultad de Ciencias Agrarias Área de Economía Rural]]></institution>
<addr-line><![CDATA[Santa Rosa Misiones]]></addr-line>
<country>Paraguay</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2019</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2019</year>
</pub-date>
<volume>21</volume>
<numero>1</numero>
<fpage>11</fpage>
<lpage>22</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.iics.una.py/scielo.php?script=sci_arttext&amp;pid=S2305-06832019000100011&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.iics.una.py/scielo.php?script=sci_abstract&amp;pid=S2305-06832019000100011&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.iics.una.py/scielo.php?script=sci_pdf&amp;pid=S2305-06832019000100011&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN El objetivo del presente trabajo fue evaluar el efecto de la variación de dosis de nitrógeno (N) en las propiedades de reflectancia del cultivo de algodón, a través de un sensor óptico. La investigación fue realizada en el campo experimental de la FCA/UNA. Filial Santa Rosa, Misiones. Los cultivares de algodón evaluados fueron IAN-425 e IPTA-212. Las dosis de nitrógeno utilizadas fueron de 0, 50, 100, 150, 200 y 250 kg ha-1, utilizando como fuente del N la urea. Se utilizó un diseño experimental de bloques completos al azar en parcelas divididas, donde las parcelas principales fueron los cultivares y las subparcelas la dosis de N. Los resultados fueron sometidos al análisis de varianza y las variables con diferencias significativas comparadas por la prueba de Tukey (p&lt;0,05). Los valores de NDVI obtenidos por el sensor fueron influenciados significativamente (p&lt;0,05) en función de las dosis de N aplicado a la planta, a partir de las evaluaciones realizadas a los 76 DDE, independientemente del tipo de cultivar, donde fueron registrados los mayores valores espectrales (0,85 y 0,84) con la dosis de N de 250 kg ha-1. No se detectaron diferencias significativas en el rendimiento de fibra en rama entre los cultivares, como también en la interacción de los factores estudiados (Cultivar x Dosis). Se resalta que el rendimiento promedio del cultivar IAN-425 fue de 3.143,17 kg ha-1 y por su vez, el cultivar IPTA-212 y se obtuvo un rendimiento promedio de 3.036,91 kg ha-1, resultados que superan ampliamente el rendimiento promedio nacional de 1.180 kg ha-1 para la zafra 2015/2016.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT The objective of the present investigation was to evaluate the effect of the nitrogen dose variation (N) on the reflectance properties of the cotton por culture, through an optical sensor. The research was conducted in the experimental field of the FCA/UNA. Subsidiary Santa Rosa, Misiones. The cotton cultivars evaluated were IAN-425 and IPTA-212. The doses of N used were 0, 50, 100, 150, 200 and 250 kg ha-1, in the form of urea, with an experimental design of random blocks in divided plots, where the main plots were the cultivars and the subplots by the dose of N. The results were subjected to a comparison of means (Tukey p&lt;0.05). The NDVI values obtained by the sensor were significantly influenced (p&lt;0.05) as a function of the N doses applied to the plant, based on the evaluations made at 76 DDE, regardless of the type of cultivar, where they were recorded. the highest spectral values (0.85 and 0.84) with the N dose of 250 kg ha-1. In spite of not detecting significant differences between the cultivars, neither in the doses of nitrogen applied to the plants, as well as in the interaction of the studied factors (Cultivar x Dosage) in the yield of fiber in branch, we can emphasize that the average yield of the cultivar IAN-425 was 3,143.17 kg ha-1 and in turn, the cultivar IPTA-212 obtained an average yield of 3,036.91 kg ha-1, results that far exceed the national average yield of 1,180 kg ha-1 for the harvest 2015/2016.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Gossypium hirsutum L]]></kwd>
<kwd lng="es"><![CDATA[estado nutricional]]></kwd>
<kwd lng="es"><![CDATA[NDVI]]></kwd>
<kwd lng="en"><![CDATA[Gossypium hirsutum L]]></kwd>
<kwd lng="en"><![CDATA[estado nutricional]]></kwd>
<kwd lng="en"><![CDATA[NDVI]]></kwd>
</kwd-group>
</article-meta>
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<nlm-citation citation-type="confpro">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Vera]]></surname>
<given-names><![CDATA[P.A.]]></given-names>
</name>
<name>
<surname><![CDATA[Bonnin]]></surname>
<given-names><![CDATA[J.J.]]></given-names>
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</person-group>
<source><![CDATA[Uso de sensor ativo para aquisição do NDVI na cultura do trigo]]></source>
<year>2015</year>
<conf-name><![CDATA[ XLIVCongresso Brasileiro de Engenharia Agrícola]]></conf-name>
<conf-loc>São Pedro, SP, Brasil </conf-loc>
</nlm-citation>
</ref>
</ref-list>
</back>
</article>
