<?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>0034-7744</journal-id>
<journal-title><![CDATA[Revista de Biología Tropical]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. biol. trop]]></abbrev-journal-title>
<issn>0034-7744</issn>
<publisher>
<publisher-name><![CDATA[Universidad de Costa Rica]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0034-77442018000100091</article-id>
<article-id pub-id-type="doi">10.15517/rbt.v66i1.27946</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Abundancia y riqueza de hongos micorrizógenos arbusculares en cafetales de Soconusco, Chiapas, México]]></article-title>
<article-title xml:lang="en"><![CDATA[Abundance and richness of arbuscular mycorrhizal fungi in coffee plantations from Soconusco, Chiapas, Mexico]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Bertolini]]></surname>
<given-names><![CDATA[Vincenzo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Montaño]]></surname>
<given-names><![CDATA[Noé Manuel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Chimal Sánchez]]></surname>
<given-names><![CDATA[Eduardo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Varela Fregoso]]></surname>
<given-names><![CDATA[Lucía]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gómez Ruiz]]></surname>
<given-names><![CDATA[Jaime]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Martínez Vázquez]]></surname>
<given-names><![CDATA[José Martín]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,El Colegio de la Frontera Sur  ]]></institution>
<addr-line><![CDATA[ Chiapas]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Autónoma Metropolitana-Iztapalapa  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Politécnica de Tapachula  ]]></institution>
<addr-line><![CDATA[ Chiapas]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Universidad Nacional Autónoma de México  ]]></institution>
<addr-line><![CDATA[ Ciudad de México]]></addr-line>
<country>Mexico</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>66</volume>
<numero>1</numero>
<fpage>91</fpage>
<lpage>105</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S0034-77442018000100091&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S0034-77442018000100091&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S0034-77442018000100091&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen El cultivo del café, en la economía mexicana y en la región del Soconusco en Chiapas, aporta importantes divisas; sin embargo es susceptible a plagas y enfermedades, por lo que se requiere reforzar su producción a través de un manejo más sustentable. Este estudio analizó la abundancia, riqueza y composición de hongos micorrizógenos arbusculares (HMA) nativos que pudieran emplearse en un futuro como biofertilizantes en el cultivo del café. En 21 muestras de suelo recolectadas en noviembre 2015 de siete sitios en la región del Soconusco, Chiapas, México, cultivados con café &#8220;robusta&#8221; (Coffea canephora), se cuantificó la abundancia de esporas, la riqueza y composición de morfoespecies de HMA y se exploró su relación con las propiedades del suelo. Se obtuvo un total de 20 morfoespecies y cinco nuevos registros de HMA para Chiapas, las morfoespecies más frecuentes pertenecen a los géneros Acaulospora y Glomus. Los sitios Toluca y Victoria tuvieron mayor riqueza de especies (17 spp. c/u) que San Agustín, 20 de noviembre y San Luis Nexapa (4 - 7 spp. c/u); mientras que Providencia y Platanar registraron una riqueza intermedia y los mayores valores de abundancia de esporas. Los sitios Victoria y Toluca presentaron un 97 % de disimilitud en la composición de especies de HMA con respecto a los demás sitios; la cual fue explicada por la baja concentración de PO4 -3en el suelo de Victoria y Toluca. La disponibilidad de P, ligada a la acidez del suelo, fueron los factores que podrían estar regulando las comunidades de HMA en el suelo de la rizosfera de los cafetos en la región del Soconusco. Se propone que podrían haber consorcios de HMA específicos para los niveles de P y acidez presentes en diferentes sitios con cafetos, o bien consorcios de especies de Acaulospora y Glomusacordes con las condiciones ambientales en las que se desarrolla el café, cuya compatibilidad y funcionalidad debe examinarse antes de emplearlos como biofertilizantes nativos en los cafetos de esta región tropical de México.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract In the Mexican economy, and especially in the Soconusco region of Chiapas, coffee is economically important, and sustainable management most cover pests and diseases. In this study, we searched for native arbuscular mycorrhizal fungi (AMF) that could be used as biofertilizers in coffee cultivation. We collected 21 soil samples from seven coffee plantations (Coffea canephora) in November 2015. We used wet sieving and decanting to quantify abundance, richness and composition of morphospecies, as well as their relationships with soil properties. A total of 20 morphospecies and five new records of AMF were obtained, and the most frequent genera were Acaulospora and Glomus. The Toluca and Victoria sites had more morphospecies richness (17 spp. each) than San Agustín, November 20 and San Luis Nexapa (4-7 spp. each). Providencia and Platanar were intermediate but had the highest spore abundance. The dissimilarity of Victoria and Toluca may reflect a low concentration of PO4 -3in the soil. P availability, linked to soil acidity, sems to be regulating these mycorrhizae communities at Soconusco. AMF consortia specific for soil P-levels and acidity, i.e. Acaulospora and Glomusconsortia, may occur and be common in the environmental conditions of Mexican coffee plantations, Strains should be tested for compatibility and functionality before using them as native biofertilizers. Rev. Biol. Trop. 66(1): 91-105. Epub 2018 March 01.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[esporas fúngicas]]></kwd>
<kwd lng="es"><![CDATA[fósforo del suelo]]></kwd>
<kwd lng="es"><![CDATA[micorriza arbuscular]]></kwd>
<kwd lng="es"><![CDATA[plantaciones de café]]></kwd>
<kwd lng="en"><![CDATA[arbuscular mycorrhizae]]></kwd>
<kwd lng="en"><![CDATA[coffee plantations]]></kwd>
<kwd lng="en"><![CDATA[fungal spores]]></kwd>
<kwd lng="en"><![CDATA[soil phosphorous]]></kwd>
</kwd-group>
</article-meta>
</front><back>
<ref-list>
<ref id="B1">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Adriano]]></surname>
<given-names><![CDATA[Ma. L.]]></given-names>
</name>
<name>
<surname><![CDATA[Jarquín]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Hernández]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<name>
<surname><![CDATA[Figueroa]]></surname>
<given-names><![CDATA[M. S.]]></given-names>
</name>
<name>
<surname><![CDATA[Monreal]]></surname>
<given-names><![CDATA[C. T.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Biofertilización de café orgánico en etapa de vivero en Chiapas, México]]></article-title>
<source><![CDATA[Revista Mexicana de Ciencias Agrícolas]]></source>
<year>2011</year>
<volume>2</volume>
<numero>3</numero>
<issue>3</issue>
<page-range>417-31</page-range></nlm-citation>
</ref>
<ref id="B2">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Aguirre-Medina]]></surname>
<given-names><![CDATA[J. F.]]></given-names>
</name>
</person-group>
<source><![CDATA[Biofertilizantes microbianos: Experiencias agronómicas del programa nacional del INIFAP en México]]></source>
<year>2006</year>
<page-range>201</page-range><publisher-loc><![CDATA[Campo Experimental Rosario Izapa. Chiapas, México ]]></publisher-loc>
<publisher-name><![CDATA[Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias. Centro de Investigaciones Regionales Pacífico Sur]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B3">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Andrade]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
<name>
<surname><![CDATA[Mazzafera]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
<name>
<surname><![CDATA[Schiavinato]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Silveira]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Arbuscular mycorrhizal association in coffee]]></article-title>
<source><![CDATA[Journal of Agricultural Science]]></source>
<year>2009</year>
<volume>147</volume>
<page-range>105-15</page-range></nlm-citation>
</ref>
<ref id="B4">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Arias]]></surname>
<given-names><![CDATA[R. M.]]></given-names>
</name>
<name>
<surname><![CDATA[Heredia]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
<name>
<surname><![CDATA[Sosa]]></surname>
<given-names><![CDATA[V. J.]]></given-names>
</name>
<name>
<surname><![CDATA[Fuentes-Ramírez]]></surname>
<given-names><![CDATA[L. E.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Diversity and abundance of arbuscular mycorrhizal fungi spores under different coffee production systems and in a tropical montana cloud forest patch in Veracruz, Mexico]]></article-title>
<source><![CDATA[Agroforestry Systems]]></source>
<year>2012</year>
<volume>85</volume>
<page-range>179-93</page-range></nlm-citation>
</ref>
<ref id="B5">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Barrera]]></surname>
<given-names><![CDATA[J. F.]]></given-names>
</name>
<name>
<surname><![CDATA[Parra]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[El café en Chiapas y la investigación en ECOSUR]]></article-title>
<source><![CDATA[Ecofronteras]]></source>
<year>2000</year>
<volume>12</volume>
<page-range>3-6</page-range></nlm-citation>
</ref>
<ref id="B6">
<nlm-citation citation-type="confpro">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Bárcenas]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Varela]]></surname>
<given-names><![CDATA[L.]]></given-names>
</name>
<name>
<surname><![CDATA[Stürmer]]></surname>
<given-names><![CDATA[S. L.]]></given-names>
</name>
<name>
<surname><![CDATA[Chávez-Bárcenas]]></surname>
<given-names><![CDATA[A. T.]]></given-names>
</name>
</person-group>
<source><![CDATA[Catálogo de hongos micorrizógenos arbusculares de huertos de aguacate de Michoacán, México]]></source>
<year>2011</year>
<conf-name><![CDATA[ VIIWorld Avocado Congress]]></conf-name>
<conf-loc>Australia </conf-loc>
</nlm-citation>
</ref>
<ref id="B7">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Bouyoucos]]></surname>
<given-names><![CDATA[G. J.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Hydrometer improved method for making particles size analysis of soil]]></article-title>
<source><![CDATA[Agronomy Journal]]></source>
<year>1962</year>
<volume>54</volume>
<page-range>464-5</page-range></nlm-citation>
</ref>
<ref id="B8">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Bünemann]]></surname>
<given-names><![CDATA[E. K.]]></given-names>
</name>
<name>
<surname><![CDATA[Oberson]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Frossard]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
</person-group>
<source><![CDATA[Phosphorus in Action:Biological Processes in Soil Phosphorus Cycling (Soil Biology)]]></source>
<year>2011</year>
<publisher-loc><![CDATA[Berlin, Alemania ]]></publisher-loc>
<publisher-name><![CDATA[Springer-Verlag]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B9">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Brundrett]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Bougher]]></surname>
<given-names><![CDATA[N.]]></given-names>
</name>
<name>
<surname><![CDATA[Dell]]></surname>
<given-names><![CDATA[B.]]></given-names>
</name>
<name>
<surname><![CDATA[Grove]]></surname>
<given-names><![CDATA[T.]]></given-names>
</name>
<name>
<surname><![CDATA[Malajczuk]]></surname>
<given-names><![CDATA[N.]]></given-names>
</name>
</person-group>
<source><![CDATA[Working with mycorrhizal in forestry and agriculture]]></source>
<year>1996</year>
<publisher-loc><![CDATA[Canberra, Australia ]]></publisher-loc>
<publisher-name><![CDATA[Australian Centre for International Agricultural Research, Monograph]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B10">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Castillo]]></surname>
<given-names><![CDATA[C. G.]]></given-names>
</name>
<name>
<surname><![CDATA[Borie]]></surname>
<given-names><![CDATA[F. R.]]></given-names>
</name>
<name>
<surname><![CDATA[Godoy]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Rubio]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Sieverding]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Diversity of arbuscular mycorrhizal plant species and fungal species in evergreen forest, deciduous forest and grassland ecosystems of Southern Chile]]></article-title>
<source><![CDATA[Journal of Applied Botany Food Quality]]></source>
<year>2006</year>
<volume>80</volume>
<page-range>40-7</page-range></nlm-citation>
</ref>
<ref id="B11">
<nlm-citation citation-type="">
<collab>CEDRSSA (Centro de Estudios para el Desarrollo Rural Sustentable y la Soberanía Alimentaria)</collab>
<source><![CDATA[Producción y mercado de café en el mundo y en México]]></source>
<year>2014</year>
</nlm-citation>
</ref>
<ref id="B12">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Chi-Guang]]></surname>
<given-names><![CDATA[W.]]></given-names>
</name>
<name>
<surname><![CDATA[Zuei-Ching]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[The Endogonaceae of Taiwan, II. Two new species ofSclerocystisfrom Taiwan]]></article-title>
<source><![CDATA[Transactions of the Mycological Society]]></source>
<year>1987</year>
<volume>2</volume>
<numero>2</numero>
<issue>2</issue>
<page-range>73-83</page-range></nlm-citation>
</ref>
<ref id="B13">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Chifflot]]></surname>
<given-names><![CDATA[V.]]></given-names>
</name>
<name>
<surname><![CDATA[Rivest]]></surname>
<given-names><![CDATA[D.]]></given-names>
</name>
<name>
<surname><![CDATA[Olivier]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Cogliatro]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Khasa]]></surname>
<given-names><![CDATA[D.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Molecular analysis of arbuscular mycorrhizal community structure and spores distribution in tree-based intercropping and forest systems]]></article-title>
<source><![CDATA[Agriculture, Ecosystems and Environment]]></source>
<year>2009</year>
<volume>131</volume>
<page-range>32-9</page-range></nlm-citation>
</ref>
<ref id="B14">
<nlm-citation citation-type="book">
<collab>CONANP (Comisión Nacional de Áreas Naturales Protegidas)</collab>
<source><![CDATA[Estudio Previo Justificativo para la Modificación de la Declaratoria de la Reserva de la Biosfera Volcán Tacaná, Chiapas, México]]></source>
<year>2011</year>
<publisher-name><![CDATA[Comisión Nacional de Áreas Naturales Protegidas]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B15">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Cuenca]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
</person-group>
<source><![CDATA[Las micorrizas arbusculares:aspectos teóricos y aplicados]]></source>
<year>2015</year>
<publisher-loc><![CDATA[Caracas, Venezuela ]]></publisher-loc>
<publisher-name><![CDATA[Ediciones IVIC, Instituto venezolano de Investigaciones Científicas]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B16">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Cuenca]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
<name>
<surname><![CDATA[Lovera]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Seasonal variation and ditribution at different soil depth of arbuscular mycorrhizal fungi spore in a tropical sclerophyllous shrubland]]></article-title>
<source><![CDATA[Botany]]></source>
<year>2010</year>
<volume>88</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>54-64</page-range></nlm-citation>
</ref>
<ref id="B17">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[de Almeida]]></surname>
<given-names><![CDATA[V. C.]]></given-names>
</name>
<name>
<surname><![CDATA[Nogueira]]></surname>
<given-names><![CDATA[M. I.]]></given-names>
</name>
<name>
<surname><![CDATA[Guimaraes]]></surname>
<given-names><![CDATA[R. J.]]></given-names>
</name>
<name>
<surname><![CDATA[Mourao Jr.]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Carbono da biomassa microbiana e micorriza en solo sub mata nativa e agroecosistemas cafeeiros]]></article-title>
<source><![CDATA[Acta Sciences Agronomica]]></source>
<year>2003</year>
<volume>25</volume>
<page-range>147-53</page-range></nlm-citation>
</ref>
<ref id="B18">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[de Beenhouwer]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Van Geel]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Ceulemans]]></surname>
<given-names><![CDATA[T.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Changing soil characteristics alter the arbuscular mycorrhizal fungi communities of Arabica coffee (Coffea arabica) in Ethiopia across a management intensity gradient]]></article-title>
<source><![CDATA[Soil Biology &amp; Biochemistry]]></source>
<year>2015</year>
<volume>91</volume>
<page-range>133-9</page-range></nlm-citation>
</ref>
<ref id="B19">
<nlm-citation citation-type="">
<collab>DGSV-CNRF</collab>
<source><![CDATA[Programa de Vigilancia Epidemiológica Fitosanitaria de la Roya del Café 2013-2015]]></source>
<year>2015</year>
</nlm-citation>
</ref>
<ref id="B20">
<nlm-citation citation-type="confpro">
<collab>FAO (Food and Agriculture Organization of the United Nations)</collab>
<source><![CDATA[Manejo Agroecológico de la Roya del Café]]></source>
<year>2015</year>
<conf-name><![CDATA[ Memorias del Seminario Científico Internacional]]></conf-name>
<conf-loc>Ciudad de Panamá, Panamá </conf-loc>
<page-range>80</page-range></nlm-citation>
</ref>
<ref id="B21">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Flores]]></surname>
<given-names><![CDATA[F. V.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[La producción de café en México: ventana de oportunidad para el sector agrícola de Chiapas]]></article-title>
<source><![CDATA[Espacio I+D, innovación más desarrollo]]></source>
<year>2015</year>
<volume>4</volume>
<numero>7</numero>
<issue>7</issue>
<page-range>175-94</page-range></nlm-citation>
</ref>
<ref id="B22">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Fonseca]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[El café de sombra: un ejemplo de pago de servicios ambientales para proteger la biodiversidad]]></article-title>
<source><![CDATA[Gaceta Ecológica]]></source>
<year>2006</year>
<volume>80</volume>
<page-range>19-31</page-range></nlm-citation>
</ref>
<ref id="B23">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Gerdemann]]></surname>
<given-names><![CDATA[J. W.]]></given-names>
</name>
<name>
<surname><![CDATA[Nicolson]]></surname>
<given-names><![CDATA[T. H.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Spores of mycorrhizal Endogone species extracted from soil by wet sieving and decanting]]></article-title>
<source><![CDATA[Transactions of the British Mycological Society]]></source>
<year>1963</year>
<volume>46</volume>
<page-range>235-44</page-range></nlm-citation>
</ref>
<ref id="B24">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Heredia]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
<name>
<surname><![CDATA[Arias]]></surname>
<given-names><![CDATA[R. M.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Hongos saprobios y endomicorrizógenos en suelos]]></article-title>
<person-group person-group-type="editor">
<name>
<surname><![CDATA[Manson]]></surname>
<given-names><![CDATA[R.H.]]></given-names>
</name>
<name>
<surname><![CDATA[Hernández-Ortiz]]></surname>
<given-names><![CDATA[V.]]></given-names>
</name>
<name>
<surname><![CDATA[Gallina]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
<name>
<surname><![CDATA[Mehltreter]]></surname>
<given-names><![CDATA[K.]]></given-names>
</name>
</person-group>
<source><![CDATA[Agroecosistemas cafetaleros de Veracruz: biodiversidad, manejo y conservación]]></source>
<year>2008</year>
<page-range>193-212</page-range><publisher-loc><![CDATA[Jalapa, México ]]></publisher-loc>
<publisher-name><![CDATA[Instituto de Ecología A.C. (INECOL) e Instituto Nacional de Ecología (INE-SEMARNAT)]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B25">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Hijmans]]></surname>
<given-names><![CDATA[R. J.]]></given-names>
</name>
<name>
<surname><![CDATA[Cameron]]></surname>
<given-names><![CDATA[S. E.]]></given-names>
</name>
<name>
<surname><![CDATA[Parra]]></surname>
<given-names><![CDATA[J. L.]]></given-names>
</name>
<name>
<surname><![CDATA[Jones]]></surname>
<given-names><![CDATA[P. G.]]></given-names>
</name>
<name>
<surname><![CDATA[Jarvis]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Very high resolution interpolated climate surfaces for global land areas]]></article-title>
<source><![CDATA[International Journal of Climatology]]></source>
<year>2005</year>
<volume>25</volume>
<page-range>1965-78</page-range></nlm-citation>
</ref>
<ref id="B26">
<nlm-citation citation-type="">
<collab>ICO (International Coffee Organization)</collab>
<source><![CDATA[Trade Statistics Tables. Exports of coffee by exporting countries]]></source>
<year>2016</year>
</nlm-citation>
</ref>
<ref id="B27">
<nlm-citation citation-type="">
<collab>ICO (International Coffee Organization)</collab>
<source><![CDATA[Historical Data on the Global Coffee Trade. Total production-Crop Year]]></source>
<year>2016</year>
</nlm-citation>
</ref>
<ref id="B28">
<nlm-citation citation-type="book">
<collab>INIFAP (Instituto Nacional de Investigaciones Forestales y Agropecuarias)</collab>
<source><![CDATA[Uso de suelo y vegetación 1:1000000]]></source>
<year>2010</year>
<publisher-loc><![CDATA[México D.F ]]></publisher-loc>
<publisher-name><![CDATA[Comisión Nacional para el Conocimiento y Uso de la Biodiversidad]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B29">
<nlm-citation citation-type="">
<collab>INVAM</collab>
<source><![CDATA[West Virginia University]]></source>
<year>2016</year>
</nlm-citation>
</ref>
<ref id="B30">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Janos]]></surname>
<given-names><![CDATA[D. P.]]></given-names>
</name>
<name>
<surname><![CDATA[Trappe]]></surname>
<given-names><![CDATA[J. M.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Two new Acaulosporas from Tropical America]]></article-title>
<source><![CDATA[Mycotaxon]]></source>
<year>1982</year>
<volume>15</volume>
<page-range>515-22</page-range></nlm-citation>
</ref>
<ref id="B31">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Mahecha-Vásquez]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
<name>
<surname><![CDATA[Sierra]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
<name>
<surname><![CDATA[Posada]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Diversity indices using arbuscular mycorrhizal fungi to evaluate the soil state in banana crops in Colombia]]></article-title>
<source><![CDATA[Applied Soil Ecology]]></source>
<year>2017</year>
<volume>109</volume>
<page-range>32-9</page-range></nlm-citation>
</ref>
<ref id="B32">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Mariscal]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
</person-group>
<source><![CDATA[El café orgánico de Chiapas crece a contracorriente y sin incentivo]]></source>
<year>2011</year>
<publisher-loc><![CDATA[México ]]></publisher-loc>
</nlm-citation>
</ref>
<ref id="B33">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Moguel]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
<name>
<surname><![CDATA[Toledo]]></surname>
<given-names><![CDATA[V.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Biodiversity conservation in traditional coffee systems of Mexico]]></article-title>
<source><![CDATA[Conservation Biology]]></source>
<year>1999</year>
<volume>13</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>11-21</page-range></nlm-citation>
</ref>
<ref id="B34">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Montaño]]></surname>
<given-names><![CDATA[N. M.]]></given-names>
</name>
<name>
<surname><![CDATA[Alarcón]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Camargo-Ricalde]]></surname>
<given-names><![CDATA[S. L.]]></given-names>
</name>
<name>
<surname><![CDATA[Hernández-Cuevas]]></surname>
<given-names><![CDATA[L. V.]]></given-names>
</name>
<name>
<surname><![CDATA[Álvarez-Sánchez]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[González-Chávez]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Ferrera-Cerrato]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Research on arbuscular mycorrhizae in Mexico: an historical synthesis and future prospects]]></article-title>
<source><![CDATA[Symbiosis]]></source>
<year>2012</year>
<volume>57</volume>
<page-range>111-26</page-range></nlm-citation>
</ref>
<ref id="B35">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Oehl]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
<name>
<surname><![CDATA[Sieverding]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
<name>
<surname><![CDATA[Ineichen]]></surname>
<given-names><![CDATA[K.]]></given-names>
</name>
<name>
<surname><![CDATA[Mader]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
<name>
<surname><![CDATA[Wiemken]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Boller]]></surname>
<given-names><![CDATA[T.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Distinct sporulation dynamics of arbuscular mycorrhizal fungal communities from different agroecosystems in long-term microcosms]]></article-title>
<source><![CDATA[Agriculture, Ecosystems &amp; Environment]]></source>
<year>2009</year>
<volume>134</volume>
<page-range>257-68</page-range></nlm-citation>
</ref>
<ref id="B36">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Olsen]]></surname>
<given-names><![CDATA[S. R.]]></given-names>
</name>
<name>
<surname><![CDATA[Cole]]></surname>
<given-names><![CDATA[C. V.]]></given-names>
</name>
<name>
<surname><![CDATA[Watanabe]]></surname>
<given-names><![CDATA[F. S.]]></given-names>
</name>
<name>
<surname><![CDATA[Dean]]></surname>
<given-names><![CDATA[L. A.]]></given-names>
</name>
</person-group>
<source><![CDATA[Estimation of available phosphorus in soils by extraction with sodium bicarbonate]]></source>
<year>1954</year>
<publisher-loc><![CDATA[Washington DC, EEUU ]]></publisher-loc>
<publisher-name><![CDATA[US Government Printing Office]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B37">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Pérez-Luna]]></surname>
<given-names><![CDATA[Y. C.]]></given-names>
</name>
<name>
<surname><![CDATA[Álvarez-Solís]]></surname>
<given-names><![CDATA[J. D.]]></given-names>
</name>
<name>
<surname><![CDATA[Mendoza-Vega]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Pat]]></surname>
<given-names><![CDATA[J. M.]]></given-names>
</name>
<name>
<surname><![CDATA[Gómez-Álvarez]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Hernández-Cuevas]]></surname>
<given-names><![CDATA[L. V.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Diversidad de hongos micorrícicos arbusculares en maíz con cultivo de cobertura y biofertilizantes en Chiapas, México]]></article-title>
<source><![CDATA[Gayana Botánica]]></source>
<year>2012</year>
<volume>69</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>46-56</page-range></nlm-citation>
</ref>
<ref id="B38">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Posada]]></surname>
<given-names><![CDATA[R. H.]]></given-names>
</name>
<name>
<surname><![CDATA[Sánchez de Prager]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Heredia]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
<name>
<surname><![CDATA[Sieverding]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Effects of soil physical and chemical parameters, and farm management practices on arbuscular mycorrhizal fungi communities and diversities in coffe plantations in Colombia and Mexico]]></article-title>
<source><![CDATA[Agroforestry Systems]]></source>
<year>2016</year>
</nlm-citation>
</ref>
<ref id="B39">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Rhoades]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Cation Exchange Capacity]]></article-title>
<person-group person-group-type="editor">
<name>
<surname><![CDATA[Page]]></surname>
<given-names><![CDATA[A. L.]]></given-names>
</name>
</person-group>
<source><![CDATA[Methods of Soil Analysis]]></source>
<year>1982</year>
<page-range>178-90</page-range><publisher-loc><![CDATA[Madison, EEUU ]]></publisher-loc>
<publisher-name><![CDATA[ASA &amp; SSSA Press]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B40">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Roxburgh]]></surname>
<given-names><![CDATA[S. H.]]></given-names>
</name>
<name>
<surname><![CDATA[Shea]]></surname>
<given-names><![CDATA[K.]]></given-names>
</name>
<name>
<surname><![CDATA[Wilson]]></surname>
<given-names><![CDATA[J. B.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[The intermediate disturbance hypothesis: Patch dynamics and mechanisms of species coexistence]]></article-title>
<source><![CDATA[Ecology]]></source>
<year>2004</year>
<volume>85</volume>
<numero>2</numero>
<issue>2</issue>
<page-range>359-71</page-range></nlm-citation>
</ref>
<ref id="B41">
<nlm-citation citation-type="journal">
<collab>Secretaria de Medio Ambiente y Recursos Naturales (SEMARNAT)</collab>
<article-title xml:lang=""><![CDATA[Norma oficial mexicana NOM-021-SEMARNAT-2000]]></article-title>
<source><![CDATA[Diario Oficial]]></source>
<year>2002</year>
<page-range>1-85</page-range></nlm-citation>
</ref>
<ref id="B42">
<nlm-citation citation-type="">
<collab>SHCP (Secretaría de Hacienda y Crédito Público)</collab>
<source><![CDATA[Panorama del café]]></source>
<year>2014</year>
</nlm-citation>
</ref>
<ref id="B43">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Smith]]></surname>
<given-names><![CDATA[S. E.]]></given-names>
</name>
<name>
<surname><![CDATA[Jakobsen]]></surname>
<given-names><![CDATA[I.]]></given-names>
</name>
<name>
<surname><![CDATA[Gronlund]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Smith]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Roles of arbuscular mycorrhizas in plant phosphorus nutrition: Interactions between pathways of phosphorus uptake in arbuscular mycorrhizal roots have important implications for understanding and manipulating plant phosphorus acquisition]]></article-title>
<source><![CDATA[Plant Physiology]]></source>
<year>2011</year>
<volume>156</volume>
<page-range>1050-7</page-range></nlm-citation>
</ref>
<ref id="B44">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Smith]]></surname>
<given-names><![CDATA[S. E.]]></given-names>
</name>
<name>
<surname><![CDATA[Read]]></surname>
<given-names><![CDATA[D. J.]]></given-names>
</name>
</person-group>
<source><![CDATA[Mycorrhizal symbiosis]]></source>
<year>2008</year>
<publisher-loc><![CDATA[San Diego, EEUU ]]></publisher-loc>
<publisher-name><![CDATA[Academic Press]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B45">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Schenck]]></surname>
<given-names><![CDATA[C. N.]]></given-names>
</name>
<name>
<surname><![CDATA[Pérez]]></surname>
<given-names><![CDATA[Y.]]></given-names>
</name>
</person-group>
<source><![CDATA[Manual for the identification of VA mycorrhizal fungi]]></source>
<year>1990</year>
<publisher-loc><![CDATA[Gainesville, EEUU ]]></publisher-loc>
<publisher-name><![CDATA[Synergistic Publications]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B46">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Schüßler]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Walker]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
</person-group>
<source><![CDATA[Glomeromycota species list]]></source>
<year>2010</year>
</nlm-citation>
</ref>
<ref id="B47">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Tomio-Goto]]></surname>
<given-names><![CDATA[B.]]></given-names>
</name>
<name>
<surname><![CDATA[Gomes]]></surname>
<given-names><![CDATA[J. J.]]></given-names>
</name>
<name>
<surname><![CDATA[Alves Da Silva]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
<name>
<surname><![CDATA[Furrazola]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
<name>
<surname><![CDATA[Torres-Arias]]></surname>
<given-names><![CDATA[Y.]]></given-names>
</name>
<name>
<surname><![CDATA[Oehl]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Glomus trufemii (Glomeromycetes), a new sporocarpic species from Brazilian sand dunes]]></article-title>
<source><![CDATA[Mycotaxon]]></source>
<year>2012</year>
<volume>120</volume>
<page-range>1-9</page-range></nlm-citation>
</ref>
<ref id="B48">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Trejo]]></surname>
<given-names><![CDATA[D.]]></given-names>
</name>
<name>
<surname><![CDATA[Ferrera-Cerrato]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[García]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Varela]]></surname>
<given-names><![CDATA[L.]]></given-names>
</name>
<name>
<surname><![CDATA[Lara]]></surname>
<given-names><![CDATA[L.]]></given-names>
</name>
<name>
<surname><![CDATA[Alarcón]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Efectividad de siete consorcios nativos de hogos micorrízicos arbusculares en plantas de café en condiciones de invernadero y campo]]></article-title>
<source><![CDATA[Revista Chilena de Historia Natural]]></source>
<year>2011</year>
<volume>84</volume>
<page-range>23-31</page-range></nlm-citation>
</ref>
<ref id="B49">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Trejo]]></surname>
<given-names><![CDATA[D.]]></given-names>
</name>
<name>
<surname><![CDATA[Guzmán]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
<name>
<surname><![CDATA[Lara]]></surname>
<given-names><![CDATA[L.]]></given-names>
</name>
<name>
<surname><![CDATA[Zulueta]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Palenzuela]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Sánchez-Castro]]></surname>
<given-names><![CDATA[I.]]></given-names>
</name>
<name>
<surname><![CDATA[Oeh]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Morphology and phylogeny ofAcaulospora foveata(Glomeromycetes) from Mexico]]></article-title>
<source><![CDATA[Sydowia]]></source>
<year>2015</year>
<volume>67</volume>
<page-range>119-26</page-range></nlm-citation>
</ref>
<ref id="B50">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Vaast]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
<name>
<surname><![CDATA[Zasoski]]></surname>
<given-names><![CDATA[R. J.]]></given-names>
</name>
<name>
<surname><![CDATA[Bledsoe]]></surname>
<given-names><![CDATA[C. S.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Effects of vesicular-arbuscular mycorrhizal inoculation at different soil P availabilities on growth and nutrient uptake of in vitro propagated coffee (Coffea arabicaL.) plants]]></article-title>
<source><![CDATA[Mycorrhiza]]></source>
<year>1997</year>
<volume>6</volume>
<page-range>493-7</page-range></nlm-citation>
</ref>
<ref id="B51">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Van der Heijden]]></surname>
<given-names><![CDATA[M. G. A.]]></given-names>
</name>
<name>
<surname><![CDATA[Sanders]]></surname>
<given-names><![CDATA[I. R.]]></given-names>
</name>
</person-group>
<source><![CDATA[Mycorrhiza l Ecology]]></source>
<year>2002</year>
<publisher-loc><![CDATA[Berlin, Alemania ]]></publisher-loc>
<publisher-name><![CDATA[Springer-Verlag]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B52">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Violi]]></surname>
<given-names><![CDATA[A. H.]]></given-names>
</name>
<name>
<surname><![CDATA[Barrientos-Priego]]></surname>
<given-names><![CDATA[A. F.]]></given-names>
</name>
<name>
<surname><![CDATA[Wright]]></surname>
<given-names><![CDATA[S. F.]]></given-names>
</name>
<name>
<surname><![CDATA[Escamilla-Prado]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
<name>
<surname><![CDATA[Morton]]></surname>
<given-names><![CDATA[J. B.]]></given-names>
</name>
<name>
<surname><![CDATA[Menge]]></surname>
<given-names><![CDATA[J. A.]]></given-names>
</name>
<name>
<surname><![CDATA[Lovatt]]></surname>
<given-names><![CDATA[C. J.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Disturbance changes arbuscular mycorrhizal fungal phenology and soil glomalin concentrations but not fungal spore composition in montane rainforests in Veracruz and Chiapas, México]]></article-title>
<source><![CDATA[Forest Ecology &amp; Management]]></source>
<year>2008</year>
<volume>254</volume>
<page-range>276-90</page-range></nlm-citation>
</ref>
<ref id="B53">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Walkley]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Black]]></surname>
<given-names><![CDATA[I. A]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[An examination of the Degtjareff method for determining soil organic matter and a proposed modification of the chromic acid titration method]]></article-title>
<source><![CDATA[Soil Science]]></source>
<year>1934</year>
<volume>37</volume>
<page-range>29-38</page-range></nlm-citation>
</ref>
</ref-list>
</back>
</article>
