a steep slope usually cannot support soil and vegetation and isn't suitable for human habitation give reasons
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1. SOIL RETENTION
2. • Soil water retention is a major soil hydraulic property that governs soil functioning in ecosystems and greatly affects soil management. Soil moisture form a major buffer against flooding and water capacity in subsoil is a major steering factor for plant growth. • Soil are generally made up of varying mixtures of three size of soil particles, sand, silt and clay, known as texture. Generally, water retention is inversely related to permeability. Sandy soils have the lowest water retention, followed by silt, and then soils high in clay. • Soil can process and contain considerable amounts of water. They can take in water until they are full, or until the rate at which they can transmit water into and through the pores is exceeded. Some of this water will steadily drain through the soil and end up in the waterways and streams but much of it will be retained, away from the influence of gravity for use of plants and other organisms to contribute to land productivity and soil health.
3. • The maximum amount of water that a given soil can retain is called field capacity, whereas a soil so dry that the plants cannot liberate the remaining moisture from the soil particles is said to be at wilting point. • The process by which soil absorbs water and water goes down is called percolation.
4. ROLES OF SOIL WATER RETENTION A) Soil water retention and organism. • Soil water retention is essential to life. It provides an ongoing supply of water to plants between periods of replenishment (infiltration), so as to allow their continued growth and survival. B)Soil retention and climate. • Soil moisture has an effect on the thermal properties of a soil profile, including conductance and heat capacity. • The association of soil moisture and soil thermal properties has a significant effect on temperature-related biological triggers, including flowering.
5. C)Soil water retention, water balance and other influences • The role of soils in retaining water is significant in terms of the hydrological cycle; including the relative ability of soil to hold moisture and changes in soil moisture over time: Soil water that is not retained or used by plants may continue downwards through the profile and contribute to the water table; this is termed ‘recharge’. Soils that is at field capacity may preclude infiltration so to increase overland flow. Both effects are associated with ground and surface water supplies, erosion and salinity Soil water can affect the structural integrity or coherence of a soil; saturated soils can become unstable and result in structural failure and mass movement. Soil water, its changes over time and management are of interest to geo technicians and soil conservationists with an interest in maintaining soil stability
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