Give a lucid account on the factors influencing soil formation.
Soil formation is a dynamic process governed by the interaction of several natural factors operating over time.
Major factors:
Parent material: The mineralogical composition and texture of rocks or sediments determine soil properties such as fertility, depth, and structure. For example, basalt forms black soils, while granite forms sandy soils.
Climate: Temperature and rainfall influence weathering, organic matter decomposition, and leaching. High rainfall accelerates leaching, while arid climates promote salinity.
Topography: Slope and elevation regulate erosion, drainage, and deposition. Steep slopes lead to shallow soils, while valleys accumulate fertile alluvium.
Biological activity: Vegetation contributes organic matter, roots aid weathering, and soil fauna improve aeration. Microorganisms transform nutrients and enhance soil development.
Time: Soil formation is gradual; younger soils retain parent material characteristics, while older soils show horizon development.
Human activity (additional factor): Deforestation, irrigation, fertilization, and land use accelerate or degrade soil formation processes.
Together, these factors create diverse soils in India, from black cotton soils to laterites and alluvials, each suited to specific crops.
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