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All About Soil. All About Soil. Soil can basically be separated into 5 main parts: Humus Clay Silt Sand Gravel. - PowerPoint PPT Presentation
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All About Soil
All About Soil
Soil can basically be separated into 5 main parts:
1.Humus2.Clay3.Silt4.Sand5.Gravel
Humus: A dark, moist soil composed of bits of dead, rotting insects, animals, leaves, roots, sticks, and food. Humus adds nutrients to the soil which plants need to grow and live.
Clay: A soil that holds water. When wet, clay feels slippery and slimy. It is made of particles that are smaller than 0.004 millimeters.
Silt: Soil that looks like fine grains or tiny pieces of rock. Particles classified as silt measure from 0.004 millimeters to 0.006 millimeters.
Sand: Soil that is coarse and drains quickly. Sand particles measure from about 0.006 millimeters to 2.00 millimeters.
Gravel: Visible rock particles, sometimes referred to as pebbles.
What is a Soil Profile?• A soil profile is
a view
of a cross section of soil.
Characteristics of the Soil Horizons
• 0 Horizon-located on surface, mostly O.M.
• A Horizon-Called Topsoil, good amounts of O.M. and minerals.
• B Horizon- Known as Subsoil, Less O.M.
• C Horizon- Mostly parent material, does little for plant growth.
What is soil texture
• It is the relative sizes of the different soil
particles.
The major Soil Texture Classes
• Sand-largest particle
• Silt-medium size particle
• Clay-smallest particle
Characteristics of aSandy Soil
Characteristics of a Silty Soil
Characteristics of a Clay Soil
Using the Soil Texture Triangle
What is Soil Structure?
• Sand, silt and clay particles combine with one anther to form cluster called aggregates.
• The way in which aggregates or clusters are arranged is referred to as soil structure.
Soil Structure Categories
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