<?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>2007-0934</journal-id>
<journal-title><![CDATA[Revista mexicana de ciencias agrícolas]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. Mex. Cienc. Agríc]]></abbrev-journal-title>
<issn>2007-0934</issn>
<publisher>
<publisher-name><![CDATA[Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2007-09342018000904328</article-id>
<article-id pub-id-type="doi">10.29312/remexca.v0i21.1534</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Diseño e instalación de un sistema de control automático de malla sombra, caso cultivo de fresa (Fragaria sp.)]]></article-title>
<article-title xml:lang="en"><![CDATA[Design and installation of an automatic shade mesh control system, case strawberry cultivation (Fragaria sp.)]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Romantchik Kriuchkova]]></surname>
<given-names><![CDATA[Eugenio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[López Cañtens]]></surname>
<given-names><![CDATA[Gilberto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Chávez Aguilera]]></surname>
<given-names><![CDATA[Noel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Flores L.]]></surname>
<given-names><![CDATA[Diego E.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Autónoma Chapingo  ]]></institution>
<addr-line><![CDATA[ Estado de México]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>11</month>
<year>2018</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>11</month>
<year>2018</year>
</pub-date>
<volume>9</volume>
<numero>spe21</numero>
<fpage>4328</fpage>
<lpage>4340</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-09342018000904328&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-09342018000904328&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-09342018000904328&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen A nivel nacional, cada vez es más frecuente la aplicación de sistemas electrónicos de control automático en los procesos de producción agrícola. El desarrollo y aplicación de los sistemas de control automático permiten la adap tación de las técnicas de cultivo a las condiciones ambientales, para conse guir un cultivo más rentable y racional en zonas pequeñas de una misma explotación agrícola. Este trabajo contempla el desarrollo y la evaluación de un sistema de control automático para controlar la apertura o el cierre de una malla sombra en función a la radiación incidente en el cultivo. Se desarrolló un algoritmo y programa que automatiza la colocación de la malla sombra, con ayuda de un controlador lógico programable (PLC Millenium III) para mayor facilidad de la implementación. Se aplicó el sistema desarrollado al cultivo de fresa (Fragaria sp.). Se realizaron las pruebas y la evaluación con tres camas de fresa: en campo abierto, malla fija y malla móvil controlada en función de la radiación. La malla sombra, se abre si la radiación es menor a 400 W/m2 o se cierra si la cantidad de radiación es mayor a 600 W/m2 al medirse con un sensor, además se puede abrir y cerrar manualmente para realizar la cosecha y el mantenimiento. Uno de los resultados obtenidos, es que la producción en la cama bajo la malla móvil es mayor en 12,88% que en la malla fija y en 37,42% que en el campo abierto.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract At the national level, the application of electronic systems of automatic control in the processes of agricultural production is becoming more frequent. The development and application of automatic control systems allow the adaptation of cultivation techniques to environmental conditions, in order to achieve a more profitable and rational crop in small areas of the same agricultural exploitation. This work contemplates the development and evaluation of an automatic control system to control the opening or closing of a shadow mesh based on the incident radiation in the crop. An algorithm and program that automates the placement of the shadow mesh was developed with the help of a programmable logic controller (PLC Millenium III) for ease of implementation. The developed system was applied to the strawberry crop (Fragaria sp.). Tests and evaluation were carried out with three strawberry beds: open field, fixed mesh and mobile mesh controlled according to the radiation. The shadow mesh opens if the radiation is less than 400 W/m2 or closes if the amount of radiation is greater than 600 W/m2 when measured with a sensor, in addition it can be opened and closed manually to carry out the harvest and the maintenance. One of the results obtained is that the production in the bed under the mobile mesh is greater in 12.88% than in the fixed mesh and in 37.42% than in the open field.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[agricultura]]></kwd>
<kwd lng="es"><![CDATA[automatización]]></kwd>
<kwd lng="es"><![CDATA[experimento]]></kwd>
<kwd lng="es"><![CDATA[PLC]]></kwd>
<kwd lng="es"><![CDATA[sensor]]></kwd>
<kwd lng="en"><![CDATA[agriculture]]></kwd>
<kwd lng="en"><![CDATA[automation]]></kwd>
<kwd lng="en"><![CDATA[experiment]]></kwd>
<kwd lng="en"><![CDATA[PLC]]></kwd>
<kwd lng="en"><![CDATA[sensor]]></kwd>
</kwd-group>
</article-meta>
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