On the black land, under the blue sky
by Antonio Jordán, University of Seville, Sevilla, Spain
The picture shows fallow vertisols in an experimental farm near Seville. Vertisols are soils locally common in large flat areas from southern Spain, characterized by the presence of smectites, swelling clays that contract during the dry season, which induces the appearance of visible cracks on the surface, and expand during the wet season, when water molecules enter the interlaminar space. Clay content is greater than 30%, and the soil surface has small mounds, forming a characteristic micro-relief known as "gilgai" (usually not observed if ploughed). Vertisols are known in Spain as "tierras negras" (black land).
Taken on 25
Submitted on 25 March 2019
Credit: Antonio Jordán (distributed via imaggeo.egu.eu)
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