0187-5779 0187-5779 S0187-57792011000100011 Spain 00 03 2011 00 03 2011 29 1 11 21

1999 14 83-151 1996 60 888-94 2003 1 83-94 1999 79-87 1995 20 759-67 1998 46 261-72 1992 23 153-61 1989 48 229-53 2001 44 47-67 2002 48 329-34 1996 64-76 2005 124 3-22 1985 1983 10 225-36 2004 78 83-90 2004 79 1-6 2003 43 325-34 2000 64 1479-86 1999 93 311-24 1991 10 126-43 1998 29 1239-51 1967 5 47-57 FAO (Food and Agriculture Organization of the United Nations) 2006 1998 62 717-24 2007 95 207-17 1976 2000 32-43 1992 30 33 - 47 2000 229-76 1989 27 187-99 1996 47 425-37 1997 48 39-48 2005 56 225-37 MAPA (Ministerio de Agricultura, Pesca y Alimentación) 1994 1990 54 1117-23 1999 259-83 2000 55-63 2002 109 165-90 2002 238 325-33 2005 165-8 2000 64 1042-9 Soil Survey Staff 2006 10 1990 41 529-34 2007 119-27 1996 57-96 1982 33 141-63 1990 54 1385-92 1986 1992 55 225-45 1934 37 29-37 1974 73 2001 99 123-45