<?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>0187-7380</journal-id>
<journal-title><![CDATA[Revista fitotecnia mexicana]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. fitotec. mex]]></abbrev-journal-title>
<issn>0187-7380</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Mexicana de Fitogenética A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0187-73802019000100021</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[CRECIMIENTO Y ACUMULACIÓN DE NO3 - EN LECHUGA HIDROPÓNICA CON RELACIONES NITRATO/AMONIO EN DOS ESTACIONES DE CULTIVO]]></article-title>
<article-title xml:lang="en"><![CDATA[GROWTH AND NO3 - ACCUMULATION IN HYDROPONIC LETTUCE WITH NITRATE/AMMONIUM RATIOS IN TWO CULTIVATION SEASONS]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Lara-Izaguirre]]></surname>
<given-names><![CDATA[Ana Y.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rojas-Velázquez]]></surname>
<given-names><![CDATA[Angel N.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Romero-Méndez]]></surname>
<given-names><![CDATA[Mauricio J.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ramírez-Tobías]]></surname>
<given-names><![CDATA[Hugo M.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cruz-Crespo]]></surname>
<given-names><![CDATA[Elia]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Alcalá-Jáuregui]]></surname>
<given-names><![CDATA[Jorge A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Loredo-Ostí]]></surname>
<given-names><![CDATA[Catarina]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Autónoma de San Luis Potosí Facultad de Agronomía ]]></institution>
<addr-line><![CDATA[ San Luis Potosí]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Autónoma de Nayarit Unidad Académica de Agricultura ]]></institution>
<addr-line><![CDATA[Xalisco Nayarit]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>04</month>
<year>2019</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>04</month>
<year>2019</year>
</pub-date>
<volume>42</volume>
<numero>1</numero>
<fpage>21</fpage>
<lpage>29</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0187-73802019000100021&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0187-73802019000100021&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0187-73802019000100021&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN La lechuga (Lactuca sativa L.) es una hortaliza de hoja que en México genera un importante ingreso económico; sin embargo, los altos niveles de nitratos (NO3 -) pueden ocasionar problemas de salud, ya que generan compuestos carcinogénicos. Una alternativa para disminuir el NO3 - en hojas es sustituyéndolo por amonio (NH4 +), lo que podría beneficiar la salud humana reduciendo la ingesta de NO3 -. El objetivo del presente estudio fue evaluar el crecimiento y acumulación de NO3 - en lechuga con diferentes relaciones de NO3 -/NH4 + en la solución nutritiva en dos estaciones de cultivo. Las lechugas se cultivaron en un sistema hidropónico de raíz flotante. El diseño experimental fue completamente al azar en arreglo factorial 4 × 2, cuatro relaciones de NO3 -/NH4 + (100/0, 80/20, 65/35 y 50/50) y dos estaciones de cultivo (verano y otoño), con un total de 8 tratamientos. Las variables evaluadas fueron peso seco de raíz (PSR), de hojas (PSH) y total (PST), área foliar (AF) y concentración de NO3 - en peciolo. No se encontraron diferencias significativas entre estaciones para PSH, PST y AF. En otoño el PSR aumentó 11 % en comparación con el de verano. En verano el contenido de NO3 - en peciolos aumentó 55 % comparado con el de otoño. La relación 100/0 aumentó 25 % el PSH, PST y AF, y 15 % más de NO3 - en peciolo. Durante el verano, utilizando una relación 100/0 se presentó un aumento de 4 % en el PSH, PST y AF. Al usar NH4 + en las relaciones 65/35 y 50/50 se redujo 25 % el crecimiento y 15 % la acumulación de NO3 - en peciolo. En la estación de verano la aplicación de 100/0 en plantas de lechuga aumentó el crecimiento. En la estación de verano el contenido de NO3 - en peciolo aumentó el doble.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[SUMMARY Lettuce (Lactuca sativa L.) is a leafy vegetable that generates important economic income in Mexico; however, high levels of nitrates (NO3 -) can cause health problems because they generate carcinogenic compounds. An alternative to reduce the NO3 - in leaves is replacing it with ammonium (NH4 +), which could benefit human health by lowering intake of NO3 -. The objective of this study was to evaluate the growth and accumulation of NO3 - in lettuce with different ratios of NO3 -/NH4 + in the nutrient solution in two growing seasons. The lettuces were grown in a floating root hydroponic system. The experimental design was completely randomized, under a 4 × 2 factorial arrangement, four ratios of NO3 -/NH4 + (100/0, 80/20, 65/35 and 50/50) and two seasons (Summer and Autumn), with a total of 8 treatments. The evaluated traits were dry weight of roots (DWR), of leaves (DWL) and total (DWT), leaf area (LA) and NO3 - concentration in petiole. No significant differences were found between seasons in DWL, DWT and LA. In Autumn DWR increased 11 % compared to that of Summer. In Summer the NO3 - content in petioles increased by 55 % compared to that of Autumn. The 100/0 ratio increased 25 % DWL, DW and LA, and 15 % NO3 -in petiole. During the Summer, there was an increase of 4 % in DWL, DWT and LA by using the 100/0 ratio. When NH4 + was used in the 65/35 and 50/50 ratios, growth was reduced by 25 % and NO3 - accumulation in petiole by 15 %. In the Summer growing season, the application of 100/0 in lettuce plants increased growth. In the summer season the NO3 - content in petiole increased twofold.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Lactuca sativa]]></kwd>
<kwd lng="es"><![CDATA[amonio]]></kwd>
<kwd lng="es"><![CDATA[crecimiento]]></kwd>
<kwd lng="es"><![CDATA[estación de cultivo]]></kwd>
<kwd lng="es"><![CDATA[nitrato]]></kwd>
<kwd lng="en"><![CDATA[Lactuca sativa]]></kwd>
<kwd lng="en"><![CDATA[ammonium]]></kwd>
<kwd lng="en"><![CDATA[growth]]></kwd>
<kwd lng="en"><![CDATA[growing season]]></kwd>
<kwd lng="en"><![CDATA[nitrate]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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