Soil is an important natural resource found on the uppermost layer of the earth’s crust in which the terrestrial (land) plants grow. It comprises a mixture of small rock particles and humus (organic materials) that develop on the surface of the earth. It is also considered an important component of the ecosystem as it is responsible for the sustainability of life and the ecosystem on earth. Mineral particles, humus, air, and water are the major constituents of the soil. Thus, the substances present in the soil can exist in all three states: solid, liquid, and gaseous. A proper balance of all the three states in the soil is necessary for the growth of a plant.
Soil comprises various layers that lie parallel to the earth’s crust. Different soil layers in a vertical form parallel to the earth’s crust is known as the soil profile. ‘Soil profile’ is also known as soil Horizon, and it comprises three zones- Horizon A, Horizon B, and Horizon C.
It takes thousands of years to make a parent rock into topsoil. The process of soil development is known as Pedogenesis.
The major factors responsible for soil formation include parent Rock material, relief or topography, climate, organic activity, and time.
The Rocks from which the soil develops are referred to as parent material. It plays an important role in determining soil’s texture, composition, and colour or appearance.
Parent materials are also derived from the sediments formed from the weathering of the bedrock. Parent materials are also derived from the sediments transported into an area by the erosion activities done by wind, water, or ice. The soils derived from the bedrock reflect the characteristics of the bedrock or the parent rock material. The process of forming soil by breaking down bedrock is known as weathering. Weathering can be physical (mechanical) or chemical. Weathering and erosion can change the soil characteristics. Sometimes the influence of some climatic factors can stow away the characteristics of the parent rock. In India, the parent material can be of various types.
It comprises the oldest rock system of India, which was formed over 4 billion years ago. They are mainly formed after the molten magma is solidified. These rocks give rise to the formation of red soil, known for its ferromagnetic properties.
This type of Rock system mainly comprises sedimentary rocks and is very thick. They are mainly found in central and south India. After the weathering process, they give rise to soils rich in calcium carbonate, and sometimes they also give rise to argillaceous soil, which comprises clay. They do not contain any metallic minerals as they are of sedimentary origin.
They are very similar to Cuddapah and Vindhyan rocks, but they are not as old. After the weathering and erosion, they give rise to a less fertile soil type.
This type of rock is mainly found in the peninsular region of India. They are formed as a result of basaltic lava. After weathering and erosion, they give rise to the formation of black soil, which is also known as regular soil. This soil has a good moisture-retaining capacity and is black due to magnetite, magnesium, titanium, and aluminium oxides.
This type of rock system mainly gives rise to the formation of alluvial soil. They are highly porous and lead to the formation of soil that contains fine silt and clay.
Relief or topography modifies the development of soil. The soil formed on the regions of low relief is more fertile due to the deposition, whereas the soils formed on the steep slopes do not contain depositions and are very less fertile.
The two important factors of climate that influence the formation of soil are precipitation (rainfall) and temperature.
Organic matter accumulation, profile mixing, and biogeochemical nutrient cycling come under organic activity. These organic activities are influenced by various living organisms, leading to modifying soil characteristics.
The soils, which take a lot of time, lead to the formation of mature soil, whereas the soils formed in less time lead to the formation of immature soil.
Soil formation includes various processes such as
Wheat, sugarcane, rice, oilseeds, vegetables, and fruits can be easily grown
They are deficient in nitrogen, phosphorus, and organic matter
Soil is a mixture of small rock particles and organic materials which support all life on earth. It is considered an important natural resource, and it is also considered an important component of the Earth that completes the biosphere. It comprises various layers in a vertical form, parallel to the earth’s crust which is referred to as soil profile and consists of horizon A, horizon B, horizon C, and horizon D. It takes thousands of years to make a parent rock into topsoil. The process of soil development is known as Pedogenesis. The major factors responsible for soil formation include parent rock material, relief (topography), climate, organic activity and time. All these factors play an important role in determining the texture, composition and colour or the appearance of the soil. Along with all these factors, various factors also contribute to the modification of soil. Some of the processes are additions, losses, translocation and transformation.
As we know, various factors lead to the formation of different types of soil in India; eight major types of soil are found. Among these, 40% of India’s total land area is covered by Alluvial soil, which is best suited for growing crops. The second most important soil is black soil which is best suited for growing cotton. The decline of soil fertility is known as soil degradation or soil erosion. It is a gradual process in which the top layer of the soil is displaced. As we know, soil is an important natural resource, we must prevent soil erosion, and we should take certain measures to conserve it.
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