<?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>0120-2812</journal-id>
<journal-title><![CDATA[Acta Agronómica]]></journal-title>
<abbrev-journal-title><![CDATA[Acta Agron.]]></abbrev-journal-title>
<issn>0120-2812</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional de Colombia]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0120-28122023000400338</article-id>
<article-id pub-id-type="doi">10.15446/acag.v72n4.111988</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Evaluación de la pérdida de grano en una nueva estructura del escudo del cabezal de la cosechadora de girasol (Helianthus annuus L.) en el híbrido confitero]]></article-title>
<article-title xml:lang="en"><![CDATA[Evaluation of grain loss in a new structure of the shield of the sunflower harvesting header (Helianthus annuus L.) in the confectionery hybrid]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mavolo]]></surname>
<given-names><![CDATA[Luca]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[David-Rivero]]></surname>
<given-names><![CDATA[Ezequiel Ricardo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Botta]]></surname>
<given-names><![CDATA[Guido Fernando]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Tecnológica Nacional Facultad Regional Trenque Lauquen ]]></institution>
<addr-line><![CDATA[Buenos Aires ]]></addr-line>
<country>Argentina</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional de La Pampa Facultad de Agronomía ]]></institution>
<addr-line><![CDATA[Santa Rosa La Pampa]]></addr-line>
<country>Argentina</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Nacional de Luján Departamento de Tecnología ]]></institution>
<addr-line><![CDATA[Luján ]]></addr-line>
<country>Argentina</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2023</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2023</year>
</pub-date>
<volume>72</volume>
<numero>4</numero>
<fpage>338</fpage>
<lpage>345</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0120-28122023000400338&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0120-28122023000400338&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0120-28122023000400338&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen En la cosecha de girasol (Helianthus annuus L.) tipo confitero es importante considerar la estructura y el material del escudo del cabezal de la cosechadora, dado que es el implemento que presenta mayor porcentaje de pérdidas. Los objetivos del presente estudio son los siguientes: a) reducir el desgrane por impacto con un escudo de estructura plana y una altura que contemple la variabilidad en la altura del cultivo; y b) determinar si la variación de la velocidad de avance es significativa en el desgrane del girasol confitero. En los ensayos se utilizó un cabezal Mainero 1040 sobre un híbrido NTC 99 CL. Se realizaron 4 tratamientos, un escudo plano de policarbonato y el escudo convexo original del cabezal, ambos ensayados a 2 velocidades de avance 5.0 km/h y 5.5 km/h. Los resultados obtenidos fueron: a) no se observó una diferencia significativa de las medias en los tipos de escudos evaluados a una misma velocidad, pero el desgrane total provocado en ambas velocidades es menor en el escudo de policarbonato; y b) el aumento de la velocidad de 5.0 km/h a 5.5 km provocó un desgrane significativo. Conclusión:el uso de un escudo plano, de mayor altura y de material con menor módulo elástico impacta de manera uniforme al capítulo de girasol, lo que provoca menor desgrane a distintas velocidades.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract In confectionery-type sunflower (Helianthus annuus L.), it is important to consider the characteristics of the harvesting header, as this implement presents the highest percentage of loss. This paper attempts to demonstrate that a shield with a flat height structure, which takes into account the crop&#8217;s unevenness, reduces grain loss. It also examines whether variations in the advance speed significantly impact grain loss in confectionerytype sunflowers. The tests were conducted on an NTC 99 CL hybrid using a Mainero 1040 harvester header. Four treatments were tested: a flat polycarbonate shield and the original header shield, each evaluated at advance speeds of 5.0 km/h and 5.5 km/h. The score showed no significant differences between treatments evaluated at the same speed. However, the total grain loss was significant in the polycarbonate shield at both advance speeds. Increasing the speed from 5.0 km/h to 5.5 km caused a significant grain loss. Conclusion: the use of a flat shield, of greater height and of material with a lower elastic modulus impacts the sunflower head uniformly, which causes less shelling at different speeds.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[cosechadoras]]></kwd>
<kwd lng="es"><![CDATA[desgrane]]></kwd>
<kwd lng="es"><![CDATA[escudo]]></kwd>
<kwd lng="es"><![CDATA[pérdida de grano]]></kwd>
<kwd lng="es"><![CDATA[polímero]]></kwd>
<kwd lng="en"><![CDATA[grain fall]]></kwd>
<kwd lng="en"><![CDATA[harvesters]]></kwd>
<kwd lng="en"><![CDATA[grain loss]]></kwd>
<kwd lng="en"><![CDATA[polymer]]></kwd>
<kwd lng="en"><![CDATA[shield]]></kwd>
</kwd-group>
</article-meta>
</front><back>
<ref-list>
<ref id="B1">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Braun]]></surname>
<given-names><![CDATA[N]]></given-names>
</name>
</person-group>
<source><![CDATA[Harvesting sunflowers]]></source>
<year>2021</year>
<publisher-loc><![CDATA[Dakota ]]></publisher-loc>
<publisher-name><![CDATA[South Dakota State University]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B2">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Dalmis]]></surname>
<given-names><![CDATA[I.]]></given-names>
</name>
<name>
<surname><![CDATA[Kayisoglu]]></surname>
<given-names><![CDATA[B.]]></given-names>
</name>
<name>
<surname><![CDATA[Bayhan]]></surname>
<given-names><![CDATA[Y.]]></given-names>
</name>
<name>
<surname><![CDATA[Ulger]]></surname>
<given-names><![CDATA[P]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Development of a chopper unit for chopping of sunflower stalk during harvesting by combine harvester]]></article-title>
<source><![CDATA[Bulgarian Journal of Agricultural Science]]></source>
<year>2013</year>
<volume>19</volume>
<numero>5</numero>
<issue>5</issue>
<page-range>4-5</page-range></nlm-citation>
</ref>
<ref id="B3">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Di Rienzo]]></surname>
<given-names><![CDATA[J. A.]]></given-names>
</name>
<name>
<surname><![CDATA[Casanoves]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
<name>
<surname><![CDATA[Balzarini]]></surname>
<given-names><![CDATA[M. G.]]></given-names>
</name>
<name>
<surname><![CDATA[González]]></surname>
<given-names><![CDATA[L.]]></given-names>
</name>
<name>
<surname><![CDATA[Tablada]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Robledo]]></surname>
<given-names><![CDATA[C. W]]></given-names>
</name>
</person-group>
<source><![CDATA[InfoStat versión 2020]]></source>
<year>2020</year>
<publisher-loc><![CDATA[Córdoba ]]></publisher-loc>
<publisher-name><![CDATA[Centro de Transferencia InfoStat, FCA, Universidad Nacional de Córdoba]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B4">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Charlesworth]]></surname>
<given-names><![CDATA[K]]></given-names>
</name>
</person-group>
<source><![CDATA[Harvest sunflowers]]></source>
<year>2017</year>
<publisher-loc><![CDATA[Northern ]]></publisher-loc>
<publisher-name><![CDATA[GRDC Grownotes]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B5">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Guzmán]]></surname>
<given-names><![CDATA[A]]></given-names>
</name>
</person-group>
<source><![CDATA[Resistencia de materiales]]></source>
<year>1976</year>
<edition>Séptima edición</edition>
<publisher-loc><![CDATA[La Plata ]]></publisher-loc>
<publisher-name><![CDATA[CEIPL]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B6">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Jalali]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Abdi]]></surname>
<given-names><![CDATA[R]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[The effect of ground speed, reel rotational speed and reel height in harvester losses]]></article-title>
<source><![CDATA[Journal of Agriculture and Sustainability]]></source>
<year>2014</year>
<volume>5</volume>
<numero>2</numero>
<issue>2</issue>
<page-range>221-31</page-range></nlm-citation>
</ref>
<ref id="B7">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Liu]]></surname>
<given-names><![CDATA[Y.]]></given-names>
</name>
<name>
<surname><![CDATA[Luo]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<name>
<surname><![CDATA[Zong]]></surname>
<given-names><![CDATA[W.]]></given-names>
</name>
<name>
<surname><![CDATA[Huang]]></surname>
<given-names><![CDATA[X.]]></given-names>
</name>
<name>
<surname><![CDATA[Ma]]></surname>
<given-names><![CDATA[L.]]></given-names>
</name>
<name>
<surname><![CDATA[Lian]]></surname>
<given-names><![CDATA[G]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Optimization of clamping and conveying device for sunflower oil combine harvester header]]></article-title>
<source><![CDATA[Agriculture]]></source>
<year>2021</year>
<volume>11</volume>
<numero>9</numero>
<issue>9</issue>
<page-range>859</page-range></nlm-citation>
</ref>
<ref id="B8">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Mavolo]]></surname>
<given-names><![CDATA[L.]]></given-names>
</name>
<name>
<surname><![CDATA[Rivero]]></surname>
<given-names><![CDATA[D.]]></given-names>
</name>
<name>
<surname><![CDATA[Botta]]></surname>
<given-names><![CDATA[G]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Evaluación de distintos materiales de construcción en el escudo del cabezal de la cosechadora de girasol (Helianthus annuus L.) para la reducción del desgrane del capítulo]]></article-title>
<source><![CDATA[AgriScientia]]></source>
<year>2022</year>
<volume>39</volume>
<numero>2</numero>
<issue>2</issue>
<page-range>65-73</page-range></nlm-citation>
</ref>
<ref id="B9">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[McClure]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Allen]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
<name>
<surname><![CDATA[Johnson]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Heatherly]]></surname>
<given-names><![CDATA[L. G]]></given-names>
</name>
</person-group>
<source><![CDATA[Sunflower: An alternative crop for Tennessee producers]]></source>
<year>2009</year>
<publisher-loc><![CDATA[Tennessee ]]></publisher-loc>
<publisher-name><![CDATA[University of Tennessee]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B10">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Rondanini]]></surname>
<given-names><![CDATA[D.]]></given-names>
</name>
<name>
<surname><![CDATA[Szemruch]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<name>
<surname><![CDATA[López Pereira]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
</person-group>
<source><![CDATA[Girasol. El confitero se abre camino]]></source>
<year>2020</year>
<publisher-name><![CDATA[Investigación HA]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B11">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Startsev]]></surname>
<given-names><![CDATA[A. S.]]></given-names>
</name>
<name>
<surname><![CDATA[Demin]]></surname>
<given-names><![CDATA[E. E.]]></given-names>
</name>
<name>
<surname><![CDATA[Danilin]]></surname>
<given-names><![CDATA[A. V.]]></given-names>
</name>
<name>
<surname><![CDATA[Vasilyev]]></surname>
<given-names><![CDATA[O. A.]]></given-names>
</name>
<name>
<surname><![CDATA[Terentyev]]></surname>
<given-names><![CDATA[A. G]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Results of the production test of sunflower harvesting attachment with an auger reel]]></article-title>
<source><![CDATA[International AgroScience Conference]]></source>
<year>2020</year>
<volume>433</volume>
<page-range>1-5</page-range></nlm-citation>
</ref>
<ref id="B12">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Startsev]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Demin]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
<name>
<surname><![CDATA[Kunshin]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Shardina]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
<name>
<surname><![CDATA[Nesterov]]></surname>
<given-names><![CDATA[E]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Comparative evaluation of the treshing machine operation when treshing sunflower heads with polyurethane beaterbars]]></article-title>
<source><![CDATA[AIP Conference Proceedings]]></source>
<year>2022</year>
<volume>2503</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>030014</page-range></nlm-citation>
</ref>
<ref id="B13">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Stepanenko]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
<name>
<surname><![CDATA[Aneliak]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Kuzmych]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Kustov]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
<name>
<surname><![CDATA[Lysaniuk]]></surname>
<given-names><![CDATA[V]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Improving the efficiency of harvesting sunflower seed crops]]></article-title>
<source><![CDATA[INMATEH - Agricultural Engineering]]></source>
<year>2022</year>
<volume>67</volume>
<numero>2</numero>
<issue>2</issue>
</nlm-citation>
</ref>
<ref id="B14">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Romito]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Damico]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Paredes]]></surname>
<given-names><![CDATA[D.]]></given-names>
</name>
<name>
<surname><![CDATA[Roba]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Colombo]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<name>
<surname><![CDATA[Pollacino]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Pincu]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Tesouro]]></surname>
<given-names><![CDATA[M. O]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Efecto de la uniformidad del tamaño de la semilla de girasol (Helianthus annuus L.) sobre la precisión del sistema dosificador mecánico de placas alveoladas de fondo plano]]></article-title>
<source><![CDATA[Informe Técnico de siembra n.° 10]]></source>
<year>2009</year>
<publisher-loc><![CDATA[Buenos Aires ]]></publisher-loc>
<publisher-name><![CDATA[Instituto de Ingeniería Rural]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B15">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Treboux]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Bergero]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
<name>
<surname><![CDATA[Calzada]]></surname>
<given-names><![CDATA[J]]></given-names>
</name>
</person-group>
<source><![CDATA[Análisis de la hoja de balance de girasol 2022/23 en Argentina y primeros indicadores comerciales de la campaña]]></source>
<year>2023</year>
<publisher-loc><![CDATA[Rosario ]]></publisher-loc>
<publisher-name><![CDATA[Dirección de Informaciones y Estudios Económicos. Bolsa de Comercio de Rosario]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B16">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Vega]]></surname>
<given-names><![CDATA[A. J.]]></given-names>
</name>
<name>
<surname><![CDATA[DeLacy]]></surname>
<given-names><![CDATA[I. H.]]></given-names>
</name>
<name>
<surname><![CDATA[Chapman]]></surname>
<given-names><![CDATA[S. C]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Progress over 20 years of sunflower breeding in central Argentina]]></article-title>
<source><![CDATA[Field Crops Research]]></source>
<year>2007</year>
<volume>100</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>61-72</page-range></nlm-citation>
</ref>
</ref-list>
</back>
</article>
