<?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>2301-1548</journal-id>
<journal-title><![CDATA[Agrociencia (Uruguay)]]></journal-title>
<abbrev-journal-title><![CDATA[Agrociencia Uruguay]]></abbrev-journal-title>
<issn>2301-1548</issn>
<publisher>
<publisher-name><![CDATA[Facultad de Agronomía - Instituto Nacional de Investigación Agropecuaria]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2301-15482018000100116</article-id>
<article-id pub-id-type="doi">10.31285/agro.22.1.12</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Variación de la precipitación y la ocurrencia de sequías en la cuenca lechera del SW del Uruguay en el período 1939 - 2011]]></article-title>
<article-title xml:lang="en"><![CDATA[Variation of Rainfall and Drought Occurrence in the SW Uruguayan Dairy Basin in the Period 1939 - 2011]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Caorsi]]></surname>
<given-names><![CDATA[María Laura]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cruz]]></surname>
<given-names><![CDATA[Gabriela]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Terra]]></surname>
<given-names><![CDATA[Rafael]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Astigarraga]]></surname>
<given-names><![CDATA[Laura]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de la República Centro Interdisciplinario de Respuesta al Cambio y Variabilidad Climática ]]></institution>
<addr-line><![CDATA[Montevideo ]]></addr-line>
<country>Uruguay</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad de la República Facultad de Agronomía ]]></institution>
<addr-line><![CDATA[Montevideo ]]></addr-line>
<country>Uruguay</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad de la República Facultad de Ingeniería ]]></institution>
<addr-line><![CDATA[Montevideo ]]></addr-line>
<country>Uruguay</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2018</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2018</year>
</pub-date>
<volume>22</volume>
<numero>1</numero>
<fpage>116</fpage>
<lpage>123</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.edu.uy/scielo.php?script=sci_arttext&amp;pid=S2301-15482018000100116&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.edu.uy/scielo.php?script=sci_abstract&amp;pid=S2301-15482018000100116&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.edu.uy/scielo.php?script=sci_pdf&amp;pid=S2301-15482018000100116&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: La producción lechera de base pastoril es sensible a las deficiencias hídricas, las cuales afectan los costos de producción y los volúmenes exportados del país. El objetivo de este trabajo es caracterizar y analizar la ocurrencia de sequías agronómicas durante un período de 72 años (1939-2011) en los departamentos de Florida y Colonia (Uruguay). Se analizó la variabilidad de las precipitaciones a partir de series históricas de las estaciones meteorológicas de Colonia y de Florida. Según la ubicación geográfica de la mayoría de los predios lecheros, se utilizaron las unidades suelo San Gabriel y Ecilda Paullier. Se comprobó estadísticamente la existencia de tendencias de déficit hídrico en primavera y verano, utilizando el test de Mann-Kendall. Las sequías agronómicas se caracterizaron utilizando el Índice de Bienestar Hídrico (IBH). Se consideró la ocurrencia de sequía cuando se constataron valores de IBH por debajo de 0,5 durante tres meses consecutivos como mínimo. Se calculó la frecuencia y recurrencia de sequías agronómicas. Los resultados indican que existe tendencia estadísticamente significativa de disminución de las deficiencias hídricas para el verano tanto para el departamento de Florida como el departamento de Colonia y para la primavera en departamento de Florida. Se destaca la alta variabilidad interanual en ambos sitios. La frecuencia de períodos de sequía y recurrencia varió según la región y la unidad de suelo.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Summary: Dairy grazing production is one of the most sensitive activities to climate variability that affect production costs and volumes exported from the country. The aim of this work was to characterize and analyze the occurrence and frequency of agronomic droughts over a period of 72 years (1939 - 2011), for the Departments of Florida and Colonia, Uruguay. Rainfall variability was analyzed using historical records of the meteorological stations of Colonia and Florida. According to the geographical location of the majority of the dairy farms, the San Gabriel and Ecilda Paullier ground units were used. The existence of water deficit trends was verified statistically, in spring and summer, using the Mann-Kendall test. Agronomic droughts were characterized using the Water Wellbeing Index (IBH). The occurrence of drought was considered when IBH values were found below 0.5 for at least three consecutive months. The frequency and recurrence of agronomic droughts were calculated. The results indicate that there is a statistically significant trend of decreasing water deficiencies for summer for both the Department of Florida and the Department of Colonia and for the spring in the Department of Florida. The high inter-annual variability in both sites is remarkable. Frequency and recurrence of droughts varied according to the region and unit of soil.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[deficiencia hídrica]]></kwd>
<kwd lng="es"><![CDATA[sequía agronómica]]></kwd>
<kwd lng="es"><![CDATA[producción lechera]]></kwd>
<kwd lng="en"><![CDATA[water deficit]]></kwd>
<kwd lng="en"><![CDATA[agronomic drought]]></kwd>
<kwd lng="en"><![CDATA[dairy production]]></kwd>
</kwd-group>
</article-meta>
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