1 23 Environmental Earth Sciences ISSN 1866-6280 Volume 68 Number 2 Environ Earth Sci (2013) 68:429-437 DOI 10.1007/s12665-012-1747-3 Effect of the addition of granitic powder to an acidic soil from Galicia (NW Spain) in comparison with lime Benita Silva, Remigio Paradelo, Nuria Vázquez, Eduardo García-Rodeja & María Teresa Barral