1. Soils are formed as a result of
Weathering of parent material producing the inorganic element of the soil
The incorporation of organic matter
The movement of water in a soil profile

2. The movement of water in a soil profile
Process of Leaching
Acidity of rainwater
Cation Exchange

3. Leaching
RAIN WATER
Magnesium
Potassium
Calcium

4. Ph scale Battery Acid (0-2) Lemon Juice (1-3) Wine (4-5)
Normal Rain (5-6)
Distilled water (7)
Baking Soda (8-9)
Soap (9-10)
Ammonia (12-13)

5. WEAK SOLUTION OF CARBONIC ACID
Acidity of Rain
CO2
CO2
CO2
WEAK SOLUTION OF CARBONIC ACID H+

6. Cation Exchange WEAK SOLUTION OF CARBONIC ACID H+ H+ H+ H+ H+ H+ H+ H+
Mg+ H+ H+ H+ K+ H+
Ca+
Mg+
Ca+ H+ H+ K+ H+
Mg+ K+
Mg+
Ca+
BASES ARE LEACHED AWAY FROM THE SOIL
Ca+
Mg+ K+ K+

7. Uses of Acidic Soils
Sheep grazing
Forestry
Tourism
Recreation