[Calcium carbonate distribution in the coastal plains of Colima] | Distribucion de la acumulacion de carbonato de calcio en la llanura costera de Colima

anglais. In soils of the Colima Coastal Plain the calcium carbonate distribution is unknown. To obtain a first approximation, a study was carried out in 20 200 hectares of the best land of the region, where citrus, mango and vegetable crops are important cash crops. In a horizontal grid 500 by 500, 806 points were sampled. The diversity of soils reflects variations in parent material and topography. Soil physical and chemical properties were measured in 30 cm increments to 90 cm depth, and soil profile observations were done at specified locations. High variation, both lateral and vertical, was observed. The former appears to be related with parent carbonates; while vertical distributions of carbonates with the amout of rainfall and topography of the site. Calcium carbonate (%) in the subsoil showed high correlation with soil texture, electrical conductivity, organic matter, and calcium carbonate content in the soil surface. Findings also showed that a soil map of calcium the most appropiae sites for planting

espagnol; castillan. El objetivo del trabajo fue obtener una aproximacion de la ocurrencia de carbonatos en suelos de la Llanura Costera de Colima. Se muestrearon 806 sitios 20 200 ha de terreno con riego. Los resultados mostraron que el area afectada por alcalinidad (63%) es considerable, pero puede presentarse en mapas y base de datos para seleccionar areas apropiadas para el establecimiento de cultivos sensibles a carbonato de calcio en el suelo. La distribucion horizontal parece estar relacionada con la fuente de materiales calizos, erosion y transporte lateral de los carbonatos; mientras que la distribucion vertical, ademas de los factores anteriores, con la cantidad de precipitacion y ubicacion topografica de los sitios. El contenido (%) de carbonato de calcio en el subsuelo mostro alta correlacion con el contenido de carbonatos y materia organica en la capa arable, la textura y conductividad electrica del suelo y subsuelo