EC.Ustox

Key to Great Groups

ECA. Ustox that have a sombric horizon within 150 cm of the mineral soil surface. Sombriustox, p. 249

ECB. Other Ustox that have, in one or more subhorizons of an oxic or kandic horizon within 150 cm of the mineral soil surface, an apparent ECEC of less than 1.50 cmol(+) per kg clay and a pH value (1N KCl) of 5.0 or more. Acrustox, p. 245

ECC. Other Ustox that have a base saturation (by NH4OAc) of 35 percent or more in all horizons within 125 cm of the mineral soil surface. Eutrustox, p. 246

ECD. Other Ustox that have a kandic horizon that has its upper boundary within 150 cm of the mineral soil surface. Kandiustox, p. 248

ECE. Other Ustox. Haplustox, p. 247

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