4b - CEC

Question 1

three cations used by plants in large amounts

Answer 1

calcium, magnesium, potassium;

Ca, Mg, K

Question 2

Three soil properties that affect CEC

Answer 2

Texture;
type of dominant clay mineral;
OM

Question 3

Give the CEC of the following colloids:

1. Montmorillonite
2. Illite
3. Kaolinite
4. OM (Humus)

Answer 3

80-100;

10-40;

3-15;

100-500

Question 4

The degree by which the exchange sites in the soil colloids are occupied by basic cations.

Answer 4

Base saturation