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

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Presentation transcript:

All About Soil All About 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 millimeters.

Silt: Soil that looks like fine grains or tiny pieces of rock. Particles classified as silt measure from millimeters to millimeters.

Sand: Soil that is coarse and drains quickly. Sand particles measure from about 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 a Sandy 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