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Questions and Answers
What percentage of a soil is composed of minerals?
What percentage of a soil is composed of minerals?
- 20%
- 60%
- 45% (correct)
- 50%
What is the primary function of soil for a farmer?
What is the primary function of soil for a farmer?
- To provide a habitat for microbes
- To support soil structure
- To provide physical strength to roots
- To absorb nutrients and water (correct)
What determines the soil texture?
What determines the soil texture?
- Pore size
- Proportion of organic matter
- Water holding capacity
- Size of soil particles (correct)
According to a soil scientist, what is soil?
According to a soil scientist, what is soil?
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What are the two main components of a soil?
What are the two main components of a soil?
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What is the approximate percentage of organic matter in a soil?
What is the approximate percentage of organic matter in a soil?
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Study Notes
Soil and its Importance
- Soil is the upper layer of earth that supports plant growth by providing water, nutrients, and physical strength to roots.
- It is a blend of organic matter, minerals, water, and air.
Composition of Soil
- Minerals: 45% of soil composition
- Organic Matter: 0-5% of soil composition
- Air: 25% of soil composition
- Water: 25% of soil composition
Physical Properties of Soil
- Include size of soil particles, soil structure, pore size, and water holding capacity
- Soil texture is determined by the relative proportion of different sized soil mineral particles (sand, silt, and clay)
- There are three main soil types based on texture
Soil Perspectives
- From a farmer's perspective, soil is an upper layer of earth that meets crop requirements
- From a soil scientist's perspective, soil is a dynamic natural body developed by natural forces acting on parent material
- Soil is considered "lively" by soil scientists due to the presence of microbes and its role in providing nutrients for plant growth
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