Soil Profile I Saad Rahoojo

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A soil profile is a vertical section of soil like the diagram above. It allows you to examine the structure of soil. A soil profile is divided into layers called horizons. • The soil is arranged in layers or horizons during its formation. These layers or horizons are known as the soil profile. The layers of soil can easily be identified by the soil colour and size of soil particles. The different layers of soil are: • Topsoil • Subsoil • Parent rock • ________________________________________ • O horizon (surface litter) • Uppermost\\organic matter (leaves, twigs, crop waste, animal waste, organic matter) • Dark, crumbly material that results from decomposition of organic matter, Brown or black • A Horizon (Topsoil layer) • Porous mix of HUMUS and some inorganic particles (weathered rock) • LEACHING/ELUVIATION zone • Fertile soil=better crops • Holds water and nutrients for plants • *** O and A are anchored by vegetation • B Horizon (subsoil) • Composed of inorganic minerals • Broke down rock (clay, silt, sand/gravel) • Receives all minerals leached out of A horizon as well as organic material that is washed down from the topsoil above • ILLUVIATION/ACCUMULATION zone • accumulation of soluble or suspended organic material, clay, iron, or aluminium • C Horizon (parent material) • Large pieces of rock that have not undergone much weathering • R Horizon • Bedrock #SoilProfile #SoilHorizons #soils #soilscience #soilprofile #SoilLayers #SoilStructure SaadRahoojo #Rahoojo #Geography #UPSCHindi #GK #RRB #RRBNTPC #IBPS #CTET #CSE #ICAR #SSC CGL #DRDO #NDA #RPSC #OPSC #BPSC #CDS #IES #CAPF #CGL #CPO #JE #NTPC #SBI #LearningAndSharing #SindhUniversity #Lectures

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