L1 /
16
CH3041
CLAY PROPERTIES
CEC = Cation Exchange Capacity (cmol kg-1)
1meq (milliequiv.) = 1 mmol Na+ = 0.5mmol Ca2+
1meq (milliequiv.) = 1 mmol Na+ = 0.5mmol Ca2+
Measured soil parameter, the CEC affects
availability of ions essential for soil fertility.
availability of ions essential for soil fertility.
CIA = Chemical
Index
of Alteration
of Alteration
Layer Mineral Type CIA CEC (typical value)
1 : 1 Kaolinite -
2o 100 8
2 : 1 Illite - 2o 80 25
Smectite - 2o 80 120
NA Feldspar - 1o 50 1
NA Basalt - 1o 30 1
