<?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>0012-7353</journal-id>
<journal-title><![CDATA[DYNA]]></journal-title>
<abbrev-journal-title><![CDATA[Dyna rev.fac.nac.minas]]></abbrev-journal-title>
<issn>0012-7353</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional de Colombia]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0012-73532020000100277</article-id>
<article-id pub-id-type="doi">10.15446/dyna.v87n212.71947</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Irrigation system with ultra low flow using branched microtubes]]></article-title>
<article-title xml:lang="es"><![CDATA[Sistema de irrigación con flujo ultra bajo utilizando microtubos ramificados]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Alves]]></surname>
<given-names><![CDATA[Dinara Grasiela]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ferreira Pinto]]></surname>
<given-names><![CDATA[Marinaldo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Alves Barreto Damasceno]]></surname>
<given-names><![CDATA[Ana Paula]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Salvador]]></surname>
<given-names><![CDATA[Conan Ayade]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Duarte Guedes Cabral de Almeida]]></surname>
<given-names><![CDATA[Ceres]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Botrel]]></surname>
<given-names><![CDATA[Tarlei Arriel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Federal Rural de Rio de Janeiro  ]]></institution>
<addr-line><![CDATA[Serópedica ]]></addr-line>
<country>Brazil</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Federal de Mato-Grosso  ]]></institution>
<addr-line><![CDATA[Rondonópolis ]]></addr-line>
<country>Brazil</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Federal Rural de Pernambuco  ]]></institution>
<addr-line><![CDATA[São Lourenço da Mata ]]></addr-line>
<country>Brazil</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Escuela Superior de Agricultura &#8220;Luiz de Queiroz&#8221; Departamento de Ingeniería de Biosistemas ]]></institution>
<addr-line><![CDATA[Piracicaba ]]></addr-line>
<country>Brasil</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>03</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>03</month>
<year>2020</year>
</pub-date>
<volume>87</volume>
<numero>212</numero>
<fpage>277</fpage>
<lpage>283</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0012-73532020000100277&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0012-73532020000100277&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0012-73532020000100277&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract With the goal of developing an irrigation system with ultra low flow rate (ULF) of 0.2 L h-1, using microtubes with derivation and operating in a laminar regime, this work began by seeking efficient irrigation and low costs. The experiment consisted of two stages. The first experiment was conducted in the laboratory to determine the actual diameter of the microtubes and irrigation system design. The second stage of the experiment was conducted in an experimental area, where tests were carried out to obtain the uniformity of water application which was evaluated by the coefficient of uniformity statistic that had an initial value exceeding 90%. The proposed irrigation system had economic advantages for small-scale producers. However, the system evaluated presented problems with accumulation of air and emitters obstruction during the study period, causing a reduction in statistical uniformity. It is therefore necessary to conduct further studies to obtain more conclusive results.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Con el objetivo de desarrollar un sistema de irrigación con ultra baja caudal (UBV) de 0,2 L h-1, utilizando microtubos con derivación y operando en régimen laminar, se inició este trabajo buscando irrigación eficiente y de bajo costo. El experimento se compuso de dos etapas. La primera parte experimental fue conducida en el laboratorio, siendo realizada la determinación del diámetro real de los microtubos y dimensionamiento del sistema de riego. La segunda etapa del experimento fue realizada en una huerta ubicada en el área experimental, donde se realizaron los ensayos para obtener la uniformidad de aplicación de agua a la cual fue evaluada por medio del coeficiente de uniformidad estadística que tuvo valor inicial superior a 90%. El sistema de riego propuesto presentó ventajas económicas para pequeños productores. Sin embargo, el mismo presentó problemas de acumulación de aire y obstrucción de emisores durante el período evaluado, ocasionando la reducción de la uniformidad estadística siendo, por lo tanto, necesaria la realización de más estudios para obtener resultados más concluyentes.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[microirrigation]]></kwd>
<kwd lng="en"><![CDATA[distribution uniformity]]></kwd>
<kwd lng="en"><![CDATA[low cost irrigation]]></kwd>
<kwd lng="es"><![CDATA[microriego]]></kwd>
<kwd lng="es"><![CDATA[uniformidad de distribución]]></kwd>
<kwd lng="es"><![CDATA[riego bajo costo]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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