Bujeo is a type of

soil Soil, also commonly referred to as earth or dirt, is a mixture of organic matter, minerals, gases, liquids, and organisms that together support life. Some scientific definitions distinguish ''dirt'' from ''soil'' by restricting the former ...

found on the countryside of

Andalusia Andalusia (, ; es, Andalucía ) is the southernmost autonomous community in Peninsular Spain. It is the most populous and the second-largest autonomous community in the country. It is officially recognised as a "historical nationality". The ...

, mainly the area of the

Guadalquivir The Guadalquivir (, also , , ) is the fifth-longest river in the Iberian Peninsula and the second-longest river with its entire length in Spain. The Guadalquivir is the only major navigable river in Spain. Currently it is navigable from the Gul ...

valley. The color ranges from yellowish brown to olive brown gray and dark gray to almost black, depending on their composition. One of its main features is its columnar structure strong and deep cracks in the dry state when dealing with materials rich in clays expansive. The texture is silty clay to clay. Their pH ranges from neutral to moderately alkaline and organic matter content is generally low. Because of the way these loamy clay soils "swell in winter and crack deeply in summer", they are called "tierras de bujeo", which literally means "land that moves".

References

{{reflist Agriculture in Spain Andalusia Soil