Soils

Question 1

Anion

Answer 1

Negatively charged soil

Question 2

CEC

Answer 2

Cation exchange Capacity
Ability of soil to hold nutrients.
Finer the soil the higher the CEC

Question 3

Cation

Answer 3

Positive charged soil

Question 4

Clay properties

Answer 4

Size: 0.002 mm

Question 5

Silt properties

Answer 5

Size: 0.002-.05

Question 6

Sand Properties

Answer 6

Size: 0.05-2.0mm

Question 7

SOM

Answer 7

• Provides source of nutrients
• increases water holding capacity
• increases CEC

Made up of active and resistant fractions.

• active: microorganisms
• resistant: humus-old material that doesn’t break down fast

Question 8

Water holding capacity

Answer 8

Sandy soils have higher water filtration rates and lower water retention than finer soils.