1405-2768 1405-2768 S1405-27682017000200167 10.18387/polibotanica.44.13 Mexico Mexico 00 00 2017 00 00 2017 44 167 183

1998 138 171-90 2001 2007 81 37-50 Asociación Oficial de Química Analítica 1990 15th 2008 Segunda 2011 191 619-33 1991 2 2 2011 167 861-71 2014 122 23-39 2009 13 5-13 2001 127 1439-48 1997 113 667-76 1991 45 495-502 2002 53 569-80 2000 23 767-81 FAO 1997 2010 41 1269-76 2004 2015 62 927-38 2005 10 3-15 1991 95 274-80 1986 53 336-45 2006 2007 94 1344-51 2000 86 611-20 1995 1989 12 331-6 2003 103-6 2009 3 64-6 1983 59 83-7 2004 93 629-52 2006 171 7-25 1990 44 488-502 2003 13-20 2005 166 961-8 2006 40 699-709 2007 24 ^s1 ^s1 1 318-25 1995 68 271-82 1985 77 59-63 1974 54 76-81 2009