Answer
- Eluviation: Eluviation refers to the process of downward movement or removal of dissolved or suspended materials from the upper layers of soil. It typically occurs due to the percolation of water through the soil, carrying away nutrients, minerals, and organic matter. Eluviation is more prominent in soils with good drainage, and it can lead to the formation of distinct soil horizons.
- Leaching: Leaching is a specific type of eluviation that involves the removal of nutrients and minerals from the soil profile by the downward movement of water. In areas with high precipitation or excessive irrigation, water can pass through the soil, dissolving and carrying away essential elements, such as nitrogen, phosphorus, potassium, and calcium. Leaching can have both positive and negative effects on soil fertility, depending on the balance between nutrient loss and replenishment.
- Zone of accumulation: The zone of accumulation, also known as the illuvial horizon, is a soil layer where materials that have been transported downward through the soil profile accumulate. These materials can include clay, iron, aluminum, organic matter, and other minerals that have leached from the upper layers. The zone of accumulation is typically found beneath the eluviation zone and contributes to the development of distinct soil horizons with different physical and chemical properties.
- Hardpan: Hardpan refers to a compacted layer of soil found below the surface, often characterized by increased density and reduced permeability. It is formed due to the compaction of soil particles over time, which can be caused by factors such as heavy machinery, repeated traffic, or natural processes. Hardpan can impede root growth, restrict water movement, and hinder drainage, negatively affecting plant growth and soil health.
Work Step by Step
Refer to the above answer.
