<?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>2071-0054</journal-id>
<journal-title><![CDATA[Revista Ciencias Técnicas Agropecuarias]]></journal-title>
<abbrev-journal-title><![CDATA[Rev Cie Téc Agr]]></abbrev-journal-title>
<issn>2071-0054</issn>
<publisher>
<publisher-name><![CDATA[Universidad Agraria de La Habana]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2071-00542018000300004</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Operational Performance of Bean Seeder -Tractor Set in Tillage Systems and Speed Steps]]></article-title>
<article-title xml:lang="es"><![CDATA[Desempeño operacional del conjunto tractor-sembradora de frijol en sistemas de labranza y escalones de velocidad]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Trujillo-Rodríguez]]></surname>
<given-names><![CDATA[Yarina M.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Fernandes]]></surname>
<given-names><![CDATA[Haroldo Carlos]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pérez-Olmos]]></surname>
<given-names><![CDATA[Claudio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[de Souza-Carneiro]]></surname>
<given-names><![CDATA[José E.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de Ciego de Ávila Facultad de Ciencias Técnicas Departamento de Mecánica Aplicada]]></institution>
<addr-line><![CDATA[ Ciego de Ávila]]></addr-line>
<country>Cuba</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidade Federal de Viçosa Departamento de Engenharia Agrícola ]]></institution>
<addr-line><![CDATA[Viçosa Minas Gerais]]></addr-line>
<country>Brazil</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidade Federal de Viçosa Departamento de Fitotecnia ]]></institution>
<addr-line><![CDATA[Viçosa Minas Gerais]]></addr-line>
<country>Brazil</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>09</month>
<year>2018</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>09</month>
<year>2018</year>
</pub-date>
<volume>27</volume>
<numero>3</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_arttext&amp;pid=S2071-00542018000300004&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_abstract&amp;pid=S2071-00542018000300004&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_pdf&amp;pid=S2071-00542018000300004&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: The objective of this work was to evaluate the operational performance of the tractor-bean seeder set considering two tillage systems and two speed steps. The testing was conducted in the experimental Agronomy-Airport Area of the Federal University of Viçosa, located in Viçosa-MG. Two land cultivation systems were introduced: conventional and minimum into a subdivided plots experimental design with two tractor working gears and four replications, totaling 16 experimental plots. The emergence speed index of the plants, the fuel consumption per hour and hectare, force and traction power and consumed energy in MJ·ha-1, in the seeding operation were determined. Processing the results by using an analysis of variance in the software Statistics SPSS 21, did not report significant differences in the emergence speed index of the plants by tillage system and allowed to recommend the use of B1 gear for offering lower power and energy consumption (MJ·ha-1). Fuel consumption per hectare, force and traction power and energy consumption (MJ·ha-1) significantly differed in the two tillage systems, being lower for minimum tillage. The conventional tillage system was the largest consumer of energy.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: Se objetivó con el presente, evaluar el desempeño operacional del conjunto tractor sembradora de frijol considerando dos sistemas de labranza y dos escalones de velocidad. El experimento se desarrolló en el área experimental de Agronomía- Aeropuerto de la Universidad Federal de Viçosa, localizada en Viçosa-MG. Se implantaron dos sistemas de labranza del suelo: convencional y mínimo, en un diseño experimental de parcelas subdivididas, con dos marchas de trabajo del tractor y cuatro repeticiones, totalizando 16 parcelas experimentales. Se determinó el índice de velocidad de emergencia, el consumo de combustible horario, y por hectárea, la fuerza y potencia de tracción y la energía consumida en MJ·ha-1, en la siembra mecanizada; los resultados procesados en el paquete estadístico SPSS Statistics 21, mediante un análisis de varianza, no reportaron diferencias significativas en el índice de velocidad de emergencia de las plantas por sistema de labranza y permitieron recomendar el uso de la marcha B1 por ofrecer menor consumo de potencia y energía (MJ·ha-1). El consumo de combustible por hectárea, la fuerza y potencia de tracción y el consumo de energía (MJ·ha-1) difirieron significativamente en los dos sistemas de labranza, siendo menor para la labranza mínima. El sistema de labranza convencional fue el mayor consumidor de energía.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[energetic demand]]></kwd>
<kwd lng="en"><![CDATA[traction power]]></kwd>
<kwd lng="en"><![CDATA[tillage systems]]></kwd>
<kwd lng="en"><![CDATA[seed]]></kwd>
<kwd lng="es"><![CDATA[demanda energética]]></kwd>
<kwd lng="es"><![CDATA[potencia de tracción]]></kwd>
<kwd lng="es"><![CDATA[sistemas de labranza]]></kwd>
<kwd lng="es"><![CDATA[siembra]]></kwd>
</kwd-group>
</article-meta>
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