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Clay minerals identified in soils of Costa Rica from 1931 to 2014: I. History, methods of analyses, and mayor clay types found in volcanic ash derived soils. Findings in a total of 84 research papers identifying clay minerals on 520 soil samples of Costa Rica are summarized. This review emphasizes on the clay minerals described in the topsoil samples, although clay minerals in the B horizons are also discussed when they are different to predominant mineralogy in the topsoil. Sites where soil clays information is available were geo-referenced, to observe their geographical distribution. In general most of the country possesses soil clays identified, except for the Nicoya Peninsula, the Northern Zone, and the Eastern Talamanca Range. Clay mineralogy suites (“predominant clay groups”) were grouped as: (1) vitrous-amorphous-halloysitic (Andisols and other soils with andic properties; (2) smectites and interstratified clays (Vertisols and other soils with vertic properties); (3) oxideshidroxides-oxihidroxides-kaolinite-gibbsite (Alfisols, Ultisols and Oxisols); Plus a large area RESUMEN Se resume la informacion disponible sobre caracterizacion de arcillas en suelos de Costa Rica desde 1931 hasta el presente, descrita en 84 trabajos con 520 observaciones hasta el 2014. La discusion se basa principalmente en la mineralogia de arcilla de los horizontes superficiales del suelo, aunque se menciona la mineralogia de los horizontes B cuando esta es diferente a la de los horizontes A de manera relevante. Despues de ubicar los datos puntuales en un mapa del pais, se encontro que algunas areas cuentan con poca o ninguna informacion (peninsula de Nicoya, Zona Norte y region este de la Cordillera de Talamanca). Para el area restante la informacion disponible se agrupo por mineralogias de “arcilla dominante”, identificandose las mineralogias: (1) vidrio-amorfo-halloysitica (Andisoles y otros suelos con caracteristicas andicas); (2) esmectitica y de arcillas interestratificadas (Vertisoles y otros suelos con caracteristicas verticas); (3) oxidos-hidroxidos-oxihidroxidos-caolinita-gibbsita (Alfisoles, Ultisoles y Oxisoles); ademas de una serie importante de mineralogias mixtas

agronomia costarricense

Arcillas identificadas en suelos de Costa Rica a nivel generalizado durante el período 1931-2014: I. historia, metodología de análisis y mineralogía de arcillas en suelos derivados de cenizas volcánicas