<?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>1659-1321</journal-id>
<journal-title><![CDATA[Agronomía Mesoamericana]]></journal-title>
<abbrev-journal-title><![CDATA[Agron. Mesoam]]></abbrev-journal-title>
<issn>1659-1321</issn>
<publisher>
<publisher-name><![CDATA[Universidad de Costa Rica]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1659-13212017000100006</article-id>
<article-id pub-id-type="doi">10.15517/am.v28i1.22751</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Sistemas de labranza y densidades de la batata: calidad del suelo y de las raíces tuberosas]]></article-title>
<article-title xml:lang="en"><![CDATA[Tillage systems and seeding densities in sweet potato: quality of soil and reserve roots]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pérez-Darniz]]></surname>
<given-names><![CDATA[Maiby]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[García-Méndez]]></surname>
<given-names><![CDATA[Auris D.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Medina]]></surname>
<given-names><![CDATA[Marielena]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Central de Venezuela  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>VE</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Central de Venezuela  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>VE</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Central de Venezuela  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>VE</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>04</month>
<year>2017</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>04</month>
<year>2017</year>
</pub-date>
<volume>28</volume>
<numero>1</numero>
<fpage>85</fpage>
<lpage>95</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S1659-13212017000100006&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S1659-13212017000100006&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S1659-13212017000100006&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[ResumenSistemas de labranza y densidades de la batata: calidad del suelo y de las raíces tuberosas. El objetivo de este trabajo fue determinar el efecto de sistemas de labranza y densidades de siembra en la calidad de las raíces tuberosas de batata ( Ipomoea batata (L) Lamb.). El estudio se realizó en la Universidad Central de Venezuela, en el año 2014. Se determinaron los grados de severidad de la degradación del suelo y su correspondencia con las escalas de preferencia basadas en el peso unitario y dimensiones de la raíz tuberosa. Se usó un arreglo en franjas, donde los sistemas de labranza (SL) fueron asignados a las parcelas, y las densidades de siembra (Ds) a las franjas. Los SL consistieron en labranza vertical con cincel (LC), con arado de disco (LA), convencional con tres pases de rastra de disco (LCo) y mínima con un pase de rastra de disco (LM). Las Ds fueron de 0,25 cm (D1) y 0,15 cm (D2) en la hilera. La calidad física del suelo fue superior en los tratamientos de LA. De estos, la combinación con la distancia de siembra más larga (LA-D1) favoreció la mayor calidad postcosecha del cultivo. Al contrario, en los tratamientos con cincel se promovió la menor aceptación del consumidor. La ligera a moderada severidad de la degradación del suelo no explicó la variación de la calidad postcosecha. Se infiere sobre la menor tasa de movimiento de agua en LC, que promovió un exceso de humedad y la más baja calidad de la raíz tuberosa.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[AbstractTillage systems and seeding densities in sweet potato: quality of soil and reserve roots. The aim of this work was to determine the effect of tillage systems and seeding densities in sweet potato ( Ipomoea batata (L) Lamb.). The study was held on the Central University of Venezuela, in the year of 2014. The degrees of severity of soil degradation and its correspondence with the scales of preference based on unit weight and dimensions of the tuberous root were determined. An arrangement of slots was used, where the tillage systems (TS) were assigned to the parcels and the seeding densities (SD) were assigned to slots. The TS consisted on vertical farming with a chisel (LC), with disc plowing (LA), conventional with three passes of the disc harrow (LCo) and a minimum with a pass of disc harrow (LM). The Ds were of 0,25 cm (D1) and 0,15 cm (D2) in the line. The physical quality of the soil was superior in the LA treatments. In these, the combination with the longest planting distances (LA-D1) favored the highest postharvest quality. On the contrary, the chisel treatments promoted the least acceptances among consumers. The light to moderate severity of soil degradation did not explain the postharvest quality variation. It is inferred on the lower rate in water movement in LD, that promoted and excess in humidity and a lower quality in the tuberous root.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[labranza]]></kwd>
<kwd lng="es"><![CDATA[raíz de reserva]]></kwd>
<kwd lng="es"><![CDATA[propiedades del suelo]]></kwd>
<kwd lng="en"><![CDATA[tillage]]></kwd>
<kwd lng="en"><![CDATA[reserve root]]></kwd>
<kwd lng="en"><![CDATA[soil properties]]></kwd>
</kwd-group>
</article-meta>
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