Soil

Definition

Soil is a natural resource composed of minerals, organic matter, water, and air. It provides essential nutrients and support for plant growth.

5 Must Know Facts For Your Next Test

1. Soil is formed through the weathering of rocks and the decomposition of organic matter over long periods.
2. Different soil types have varying capacities to retain water and nutrients, affecting plant growth.
3. The pH level of soil can influence nutrient availability and microbial activity.
4. Soil structure affects root penetration and water movement through the soil profile.
5. Soil organisms play a crucial role in decomposing organic material and recycling nutrients.

Review Questions

• What are the main components of soil?
• How does soil pH affect plant nutrition?
• Why is soil structure important for plant roots?

Related terms

Humus: The dark, organic component of soil formed by the decomposition of plant and animal matter

Loam: A fertile soil type made up of roughly equal parts sand, silt, and clay

Soil Erosion: The process by which the top layer of soil is removed by wind or water