<?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>2007-1124</journal-id>
<journal-title><![CDATA[Revista mexicana de ciencias pecuarias]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. mex. de cienc. pecuarias]]></abbrev-journal-title>
<issn>2007-1124</issn>
<publisher>
<publisher-name><![CDATA[Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2007-11242022000300706</article-id>
<article-id pub-id-type="doi">10.22319/rmcp.v13i3.6022</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Forage availability in Xaraés grass pastures subjected to nitrogen sources of the slow and fast release]]></article-title>
<article-title xml:lang="es"><![CDATA[Disponibilidad de forraje en praderas de pasto Xaraés en respuesta a fuentes de nitrógeno convencionales y tratadas con N-(n-butil) triamida tiofosfórica (NBPT)]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Matos]]></surname>
<given-names><![CDATA[Luís Henrique Almeida]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rodrigues]]></surname>
<given-names><![CDATA[Carlindo Santos]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pina]]></surname>
<given-names><![CDATA[Douglas dos Santos]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Leite]]></surname>
<given-names><![CDATA[Vagner Maximino]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Silva]]></surname>
<given-names><![CDATA[Paula Aguiar]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pereira]]></surname>
<given-names><![CDATA[Taiala Cristina de Jesus]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Carvalho]]></surname>
<given-names><![CDATA[Gleidson Giordano Pinto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Federal University of Bahia School of Veterinary Medicine and Animal Science ]]></institution>
<addr-line><![CDATA[Salvador Bahia]]></addr-line>
<country>Brazil</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Federal Institute of Education, Sciences and Technology Baiano  ]]></institution>
<addr-line><![CDATA[Bahia ]]></addr-line>
<country>Brazil</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>09</month>
<year>2022</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>09</month>
<year>2022</year>
</pub-date>
<volume>13</volume>
<numero>3</numero>
<fpage>706</fpage>
<lpage>724</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-11242022000300706&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-11242022000300706&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-11242022000300706&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract The N-(n-butyl) thiophosphoric triamide (NBPT), a urease inhibitor, has been reported as one of the most promising compounds to reduce losses by volatilization, and to maximize the use of urea nitrogen (N) in agricultural systems. A field study was carried out to examine urease inhibitors' potential about volumetric density and forage mass grass (Brachiaria brizantha cv. Xaraés) to N application. The experiment was carried out from September 2017 to September 2018. The experimental design used was complete randomized blocks in the 3×2×4 factorial array, considering: three periods of the year (wet season, dry season, and the transition), two sources of urea (conventional urea and NBPT-treated urea), and four N rates (0, 80, 160 and 240 kg N ha-1 yr-1), replicated three times. Nitrogen sources promoted a positive effect (P&lt;0.0001) on bulk density, forage mass, and in the grazing stratum during the wet season and the transition season, with increasing N rates in pastures. The leaf: stem ratio decreased linearly (P&lt;0.0045) as increased N rates, and the higher ratio during the wet season and lower in the dry season of the year. For the rates of 80 kg N ha-1 yr-1, there was a significant difference (P=0.0042) between sources, with greater (P=0.0006) forage mass of 0-30 cm, post-grazing forage mass (P=0.0042) and forage volumetric density (P=0.0006), when utilized the conventional urea. The application of N, regardless of the source, provides an increase in forage mass and volumetric density in Xaraés grass pastures up to a dose of 240 kg N ha-1 yr-1, in the transition season and wet season.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen La N-(n-butil) triamida tiofosfórica (NBPT) es un inhibidor de la ureasa usado en los sistemas agrícolas para reducir las pérdidas por volatilización de NH3 y maximizar el uso del nitrógeno ureico (N). Se realizó un estudio de campo para evaluar el efecto de la urea tratada con NBPT sobre la densidad volumétrica y la masa de forraje en el pasto Brachiaria brizantha cv. Xaraés. El periodo experimental fue de un año (septiembre 2017 a septiembre 2018). El diseño experimental fue de bloques completamente aleatorios con un arreglo factorial de 3×2×4: tres estaciones del año (lluvia, sequía y transición), dos fuentes de urea (convencional y tratada con NBPT), y cuatro tasas de N (0, 80, 160 y 240 kg N ha-1 año-1). Se hicieron tres réplicas. Ambas fuentes de nitrógeno tuvieron un efecto positivo (P&lt;0.0001) sobre la densidad aparente, la masa de forraje y el estrato de pastoreo durante la estación de lluvia y la de transición. También produjeron aumentos de N en los pastos. La relación hoja:tallo disminuyó linealmente (P&lt;0.0045) a medida que aumentaron las tasas de N; la relación mayor fue durante la estación de lluvia y la menor en la estación de sequía. A la tasa de 80 kg N ha-1 año-1, hubo una diferencia (P=0.0042) entre las fuentes de N. A esta tasa la urea convencional produjo una mayor (P=0.0006) masa de forraje total, masa de forraje pospastoreo (P= 0.0042) y densidad volumétrica del forraje (P=0.0006). En las estaciones de lluvia y de transición, la aplicación de N, cual sea la fuente, resultó en un aumento en la masa y la densidad volumétrica del forraje en praderas de pasto Xaraés hasta la tasa de 240 kg N ha-1 año-1.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Brachiaria brizantha]]></kwd>
<kwd lng="en"><![CDATA[Nutrient use efficiency]]></kwd>
<kwd lng="en"><![CDATA[Pastures]]></kwd>
<kwd lng="en"><![CDATA[Ammonia volatilization]]></kwd>
<kwd lng="es"><![CDATA[Brachiaria brizantha]]></kwd>
<kwd lng="es"><![CDATA[Eficiencia de uso de nutrientes]]></kwd>
<kwd lng="es"><![CDATA[Praderas]]></kwd>
<kwd lng="es"><![CDATA[Volatilización de amonio]]></kwd>
</kwd-group>
</article-meta>
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