2079-3480 2079-3480 S2079-34802018000400435 Ecuador Ecuador Cuba México Cuba 00 12 2018 00 12 2018 52 4 435 445

AOAC 2000 2 17 th Ed 777-8 2014 19 2 2 244-58 1995 51 1-13 2015 7 1 1 43-9 2015 42 1 1 57-63 2015 8 2 2 13-27 1937 160 2 2 268-82 2000 23 1 1 87-92 2015 6 5 5 1035-49 2017 8 3 3 599-610 2015 2 1y2 1y2 17-26 2017 8 1 1 101-9 1955 11 1-42 2010 12 1 1 5-10 2015 2 1 y 2 1 y 2 27-34 2016 50 1 1 131-7 1970 379 2012 7 1 1 88-99 2017 18 1 1 83-90 1951 68-78 2017 4 2 2 116-27 2017 18 2 2 217-32 2013 48 1 1 114-21 2015 18 3 3 291-301 2018 13 1 1 17-30 2010 12 3 3 303-11 2018 19 4 4 2018 11 5 5 34-8 Soil Survey Staff 2003 Ninth Edition 332 2016 34 1 1 25-32