A Palexerult soil from the Pliocene raña formations in northern Spain was used to conduct acidity correction tests with limestone, gypsum rock and sugar foam waste under laboratory conditions. The soil was reconstructed in methacrylate columns that were studied over a fivemonth period. The pH and exchangeable bases in the leachates, obtained by applying an amount of water equivalent to the mean rainfall of the area from which the soil was collected, were measured under laboratory conditions along a five-month period. At the end of these tests, three
Three red soils and a brown soil developed on the three distinct levels of the fluviglacial terraces in the interfluvial area between the beds of the rivers Aragón and Aragón Subordán (Pyrenean range, France-Spain) were studied. This terrace system features ubiquitous red soil topping the upper 60 m terrace and brown soil on the intermediate (20 m) and lower terrace (2-3 m). However, the most salient feature of the studied area, an explanation for which was sought in this work, is the presence of red soils in the two sub-levels that form the 20 m terrace. For this purpose, and also with a view to characterizing the soils, material from the different levels studied was subject to textural analysis using three different dispersal methods (water, Sodium hexametaphosphate, and previous removal of iron oxides). In this way, the clay/silt ratio and naturally dispersed clay (NDClay) were determined (the latter as the clay-H 2 O/clay-hexam ratio). The heavy and light fractions of 1885 1886 VIDAL ET AL. sand were examined under a petrographic microscope and a scanning electron microscope (SEM) and the results were subjected to an analysis of variance. The interpretation of these results, in addition to the presence of pseudomorphic pyrites and other iron forms, and on the interpretation of analytical data, the red soils in the two sub-levels of the 20 m terrace were transported from a neighboring zone.
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