2079-3480 2079-3480 S2079-34802020000300413 Ecuador Ecuador Ecuador Cuba Cuba 00 12 2020 00 12 2020 54 3 413 424

AOAC (Association of Official Analytical Chemists) 2016 20th 1995 51 1-2 1-2 1-13 2015 36 2 2 933-41 1937 160 2 2 268-82 2009 2 2 2 11-8 2000 23 1 1 87-92 2011 34 2 2 123-31 2018 102 6 6 1464-71 2018 48 02 02 1-8 2020 9 1 1 1955 11 1 1 1-42 2015 16 4 4 758-71 2018 49 3 3 529-36 2004 5th 1970 379 379 2006 1-108 2010 59 228 228 561-70 2020 11 1 1 241-54 2017 33 3 3 685-96 2018 39 1 1 113-8 1951 4 543 543 68-78 2018 4 2 2 222-7 2012 13 4 4 1-11 2014 15 05 05 1-8 2019 10 2 2 249-58 2019 53 1 1 21-8 2017 18 10 10 1-14 2017 38 5 5 3173-91 Soil Survey Staff 2003 9th 2017 73 2 2 522-31