Silt

Definition

Silt is a granular material composed of fine mineral particles that are larger than clay but smaller than sand. It plays a crucial role in soil fertility and water retention.

5 Must Know Facts For Your Next Test

1. Silt particles typically range from 0.002 to 0.05 millimeters in diameter.
2. Silt has the ability to retain water better than sand but drains more efficiently than clay.
3. Soil with high silt content can support plant growth by providing essential nutrients and moisture.
4. Erosion can transport silt, leading to sedimentation in rivers and lakes.
5. Silty soils are often fertile but can become compacted, reducing air space for plant roots.

Review Questions

• What particle size range defines silt?
• How does the water retention capability of silt compare to sand and clay?
• What are two potential benefits of having silt in soil for plant growth?

Related terms

Clay: A type of fine-grained natural soil material containing tiny mineral particles less than 0.002 millimeters in diameter.

Sand: A granular material composed of finely divided rock and mineral particles, typically ranging from 0.05 to 2 millimeters in diameter.

Loam: A soil type that is a balanced mixture of sand, silt, and clay, known for its fertility and good drainage properties.