<?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>2079-3480</journal-id>
<journal-title><![CDATA[Cuban Journal of Agricultural Science]]></journal-title>
<abbrev-journal-title><![CDATA[Cuban J. Agric. Sci.]]></abbrev-journal-title>
<issn>2079-3480</issn>
<publisher>
<publisher-name><![CDATA[Editorial del Instituto de Ciencia Animal]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2079-34802018000100067</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Study of the fertility of a carbonate red brown soil in a biomass bank with Cenchrus purpureus cv. CUBA CT-115 of ten exploitation years]]></article-title>
<article-title xml:lang="es"><![CDATA[Estudio de la fertilidad de un suelo pardo rojizo carbonatado en un banco de biomasa con Cenchrus purpureus vc. CUBA CT-115 de diez años de explotación]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Crespo López]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cabrera Carcedo]]></surname>
<given-names><![CDATA[E. A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Díaz García]]></surname>
<given-names><![CDATA[V.J.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto de Ciencia Animal  ]]></institution>
<addr-line><![CDATA[San José de las Lajas Mayabeque]]></addr-line>
<country>Cuba</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Estación de Suelos de Pinar del Río  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Cuba</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>03</month>
<year>2018</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>03</month>
<year>2018</year>
</pub-date>
<volume>52</volume>
<numero>1</numero>
<fpage>67</fpage>
<lpage>74</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_arttext&amp;pid=S2079-34802018000100067&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_abstract&amp;pid=S2079-34802018000100067&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_pdf&amp;pid=S2079-34802018000100067&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract The objective of this experiment was to research, between 2013-2015, the effect of biomass bank technology on soil fertility and on some morphological indicators of Cenchrus purpureus cv. Cuba CT-115, grazed for more than ten consecutive years in the genetic enterprise "Camilo Cienfuegos", in Pinar del Río province. It was found in the soil pH decrease (5.38 to 5.07, P &lt;0.001), assimilable P2O5 (31.7 to 27.3 ppm; P &lt;0.016), assimilable K2O (56.5 to 48.2 ppm; P &lt;0.001), exchangeable Mg++ (1.10 to 0.82) cmol (+)/kg, P &lt;0.001), base change capacity BCC (3.06 to 2.67 cmol (+)/kg, P &lt;0.002) and cation-exchange capacity CEC (4.39 to 4.12 cmol (+)/kg; P &lt;0.006), while organic matter OM increased (2.62 to 2.80 %; P &lt;0.004) and interchangeable Ca ++, Na + and K + were not affected. In this case, the compaction significantly increased and the porosity and basal respiration decreased. The tillers/bunch indicator, determined in the rainy and dry seasons of 2015, showed a lower value (P &lt;0.0001) in the dry season (10.70), which coincided with the lower value of the grass yield at that season of the year. The biomass of grass roots was higher in the depth of 15 - 30 cm of the soil (1.01 g/cylinder), in comparison with the superficial layer of 0 - 10 cm (0.54 g/ cylinder). However, in the area occupied by the biomass bank, in 2015 acceptable values in the grass morphological indicators, the macrofauna activity (especially earthworms) and the root biomass were found. It is concluded that this soil showed low resilience power, with significant decrease of pH and P, K and Mg contents in the bank that has ten years of uninterrupted grazing. This decrease in the indicators of soil fertility was also reflected in the decrease of CP, P and Ca contents, as well as in the CT-115 digestibility. These results warn about the need to supplement the animals that grazed in this bank with sources of protein, phosphorus and calcium to achieve the right balance in their diets.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen El objetivo de este experimento fue investigar, entre 2013-2015, el efecto de la tecnología del banco de biomasa en la fertilidad del suelo y en algunos indicadores morfológicos de Cenchrus purpureus vc. Cuba CT-115, pastoreado durante más de diez años consecutivos en la empresa genética &#8220;Camilo Cienfuegos&#8221;, en la provincia de Pinar del Río. Se encontró en el suelo disminución de pH (5.38 a 5.07; P &lt; 0.001), P2O5 asimilable (31.7 a 27.3 ppm; P &lt; 0.016), K2O asimilable (56.5 a 48.2 ppm; P &lt; 0.001), Mg++ intercambiable (1.10 a 0.82 cmol(+)/kg; P &lt;0.001), capacidad de cambio de bases CCB (3.06 a 2.67 cmol(+)/kg; P &lt; 0.002) y capacidad de intercambio catiónico CIC (4.39 a 4.12 cmol(+)/kg; P &lt; 0.006), mientras que la materia orgánica MO aumentó (2.62 a 2.80 %; P &lt; 0.004) y el Ca++, Na+ y K+ intercambiables no se afectaron. En este caso, la compactación se incrementó significativamente y la porosidad y la respiración basal disminuyeron. El indicador hijos/plantón, determinado en las estaciones lluviosa y seca de 2015, presentó menor valor (P &lt; 0.0001) en la época de seca (10.70), que coincidió con el menor valor del rendimiento del pasto en esa época del año. La biomasa de raíces del pasto fue mayor en la profundidad de 15 - 30 cm del suelo (1.01 g/cilindro), en comparación con la capa superficial de 0 - 10 cm (0.54 g/cilindro). No obstante, en el área que ocupó el banco de biomasa, se encontró en 2015 valores aceptables en los indicadores morfológicos del pasto, la actividad de la macrofauna (en especial las lombrices) y la biomasa radicular. Se concluye que este suelo mostró bajo poder de resiliencia, con disminución significativa del pH y de los contenidos de P, K y Mg en el banco que lleva diez años de pastoreo ininterrumpido. Este descenso de los indicadores de la fertilidad del suelo se reflejó también en la disminución de los contenidos de PB, P y Ca, así como en la digestibilidad del CT-115. Estos resultados alertan acerca de la necesidad de suplementar los animales que pastorean en este banco con fuentes de proteína, fósforo y calcio para lograr el balance adecuado en sus dietas.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[resilience]]></kwd>
<kwd lng="en"><![CDATA[grazing]]></kwd>
<kwd lng="en"><![CDATA[dairy unit]]></kwd>
<kwd lng="en"><![CDATA[biomass]]></kwd>
<kwd lng="es"><![CDATA[resiliencia]]></kwd>
<kwd lng="es"><![CDATA[pastoreo]]></kwd>
<kwd lng="es"><![CDATA[vaquería]]></kwd>
<kwd lng="es"><![CDATA[biomasa]]></kwd>
</kwd-group>
</article-meta>
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