There are a great variety of soils in existence. A number of parameters play a role:
- Type of bedrock
- Biological factors
Only the upper part of the soil is important for vegetation. This fine layer of less than 40 cm is the locale for the mixing of organic wastes at the surface (humus) and the deeper mineral base. High quality agricultural land has the following proportions:
- 25% air
- 25% water
- 45% mineral matter
- 5% organic matter
- To understand the process of soil formation.
- To understand the role of decomposers in the life cycles of living species (plants, animals).
The appearance of a layer of vegetation is the final stage in the very long process of soil formation.
- The first stage is the longest. It is the alteration of the bedrock by the phenomena of…
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