Soil Genesis Flashcards
Serves as a medium of plant growth.
Soil
True or False
Soil Considered as a renewable resource
False
A natural body with dimensions of thickness and distinct horizontal and vertical boundaries.
Soil
The soil is composed of…
Water - 25%
Air - 25%
Organic Matter - 5%
Mineral Matter - 45%
TYPES OF SOIL
It is mainly made up of sand particles. This soil is light and porous. It has large pore spaces. So there is better aeration, but the water-retaining capacity is low. Rapid movement of water washes the minerals away to the lower layers where roots do not reach.
Sandy Soil
TYPES OF SOIL
It has a large number of clay particles and very little sand. The pore spaces are small, and therefore, the movement of water to the lower level is very slow. Hence it has a good water-retaining capacity.
Clayey Soil
TYPES OF SOIL
This type of soil has an equal proportion of sand and clay. It has enough air between soil particles, it can hold sufficient water, and it contains a lot of humus. It is the best soil for plant growth.
Loamy Soil
Soil Solids
Chief natural source of Nitrogen; indicative of the nitrogen status of soil.
Organic Matter
Soil Solids
Enables the soil to store cations
Organic Matter
Soil Solids
Consists of weathered Rocks and Minerals
Mineral Matter
Pore Space
Composed of 78% of Nitrogen, 21% of Oxygen and 1% Carbon Dioxide and other gases.
Air
Pore Space
Provides oxygen for respiration of plant roots
Air
Pore Space
Contains dissolved gases and salts or compounds as well as dissociated ions of various nutrient elements.
Water
Pore Space
Serves as the weathering agent of minerals.
Water
APPROACHES IN THE STUDY OF SOIL SCIENCE
The study of soil with principal interest on characterization and differentiation of their properties and with only minor emphasis on their practical use.
PEDOLOGICAL APPROACH
