Transcript All About Soil - Cobb Learning

AllAllAbout
About
Soil
Soil
Soil can basically be
separated into 5 main parts:
1.Humus
2.Clay
3.Silt
4.Sand
5.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.
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
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