Using the table of average cmol c kg 1 clay below, estimate the CEC (cmol c kg 1 soil) of a soil with 42 clay composed of the following clay minerals 24 kaolinite, 18 vermiculite, 26 smectite and 10 illite Mineral CEC (cmolc kg) Range Avg Vermiculite 150 200 175 Smectite 80 120 100 Illite 20 40 30 Kaolinite 5 15 10 Organic matter 150 500 a 6 3 b 26 4 c 15 7 d 36 6 e 19 1

Question: Using the table of average cmol + c kg -1 clay below, estimate the CEC (cmol + c kg -1 soil) of a soil with

Using the table of average cmol⁺c kg^-1 clay below, estimate the CEC (cmol⁺c kg^-1 soil) of a soil with 42% clay composed of the following clay minerals: 24% kaolinite, 18% vermiculite, 26% smectite and 10% illite.

Mineral	CEC (cmolc/kg)
Range	Avg
Vermiculite	150 – 200	175
Smectite	80 – 120	100
Illite	20 – 40	30
Kaolinite	5 – 15	10
Organic matter	150 – 500	-----

a.6.3

b.26.4

c.15.7

d. 36.6

e.19.1

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