Explain any five factors responsible for the formation of soil.
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Answer:
Five factors of soil formation. Scientists attribute soil formation to the following factors: Parent material, climate, biota (organisms), topography and time.
Factors Responsible for the Formation of Soil
The relief features, parent material, climate, vegetation and other life-forms as well as time apart from human activities are the major factors responsible for the formation of soil.
1 . Parent Material: It is deposited by streams or derived from in-situ weathering. In this stage, soil inherits many properties like the mineral composition, the colour, the particle size and the chemical elements. For example- Black soil derived its colour from lava rock
2. Climate: It is one of the important factors in the formation of soil because it affects the rate of weathering of the parent rock.
3. Role of precipitation: The variability in the precipitation modified the composition of the soil. For Example- Areas with little rainfall with high rate of evaporation led to the accumulation of salts in the soil. The soils underlying tropical rain forests tend to be nutrient-poor because of intensive leaching due to heavy rains
4. Role of temperature: It is also play important role because fluctuations in temperature causes shrinking and swelling, frost action and general weathering in soils.
5. Topography (Relief, Altitude and Slope): It is considered as passive factor to modifying the effects of climate because it affects soil processes, soil distribution and the type of vegetation.
6. Time: The formation of the soil is not one day process but requires many years to form. Younger soils have some characteristics from their parent material, but as they age, the addition of organic matter, exposure to moisture and other environmental factors may change its features.
7.Biota (Flora, Fauna and Microorganisms): Biota, in conjunction with climate, modifies parent material to produce soil. For Example- Leguminous plants (such as beans, peas, and groundnuts) have nitrogen-fixing bacteria. These plants take the nitrate ions directly from these nitrogen-fixing bacteria. It improves the fertility of soil by fixing atmospheric nitrogen to ammonia or ammonium.
It is noteworthy that the above factors are separated but interdependent because the soil profile of any region around the world is dependent on is dependent on climate, parent material, topography, time.
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