0258-5936 0258-5936 S0258-59362019000200006 Ecuador Cuba Ecuador 00 06 2019 00 06 2019 40 2

1 2015 1 2 FAO 2015 4 3 FAO 2015 4 4 2012 3 3 3 87-97 5 2017 38 1 1 50-6 6 2013 67 7 2016 19 8 2015 9 2017 1 10 1934 37 1 1 29-38 11 Munsell Book of Soil Color Charts [Internet] 2009 12 2015 13 2014 176 14 2003 15 2010 31 2 2 37-47 16 2014 5 7 7 1275-85 17 2014 195 1-9 18 2014 19 2017 74 4 4 311-6 20 2004 21 2016 86 8-16 22 2006 23 1991 11 24 1994 283-284 283-284 39-56